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Genesis-Plus-GX/core/vdp_render.c

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/***************************************************************************************
* Genesis Plus
* Video Display Processor (Modes 0, 1, 2, 3, 4 & 5 rendering)
*
* Support for SG-1000, Master System (315-5124 & 315-5246), Game Gear & Mega Drive VDP
*
* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Charles Mac Donald (original code)
* Copyright (C) 2007-2013 Eke-Eke (Genesis Plus GX)
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met:
*
* - Redistributions may not be sold, nor may they be used in a commercial
* product or activity.
*
* - Redistributions that are modified from the original source must include the
* complete source code, including the source code for all components used by a
* binary built from the modified sources. However, as a special exception, the
* source code distributed need not include anything that is normally distributed
* (in either source or binary form) with the major components (compiler, kernel,
* and so on) of the operating system on which the executable runs, unless that
* component itself accompanies the executable.
*
* - Redistributions must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************************/
#include "shared.h"
#include "md_ntsc.h"
#include "sms_ntsc.h"
/*** NTSC Filters ***/
extern md_ntsc_t *md_ntsc;
extern sms_ntsc_t *sms_ntsc;
/* Output pixels type*/
#if defined(USE_8BPP_RENDERING)
#define PIXEL_OUT_T uint8
#elif defined(USE_32BPP_RENDERING)
#define PIXEL_OUT_T uint32
#else
#define PIXEL_OUT_T uint16
#endif
/* Pixel priority look-up tables information */
#define LUT_MAX (6)
#define LUT_SIZE (0x10000)
#ifdef ALIGN_LONG
#undef READ_LONG
#undef WRITE_LONG
INLINE uint32 READ_LONG(void *address)
{
if ((uint32)address & 3)
{
#ifdef LSB_FIRST /* little endian version */
return ( *((uint8 *)address) +
(*((uint8 *)address+1) << 8) +
(*((uint8 *)address+2) << 16) +
(*((uint8 *)address+3) << 24) );
#else /* big endian version */
return ( *((uint8 *)address+3) +
(*((uint8 *)address+2) << 8) +
(*((uint8 *)address+1) << 16) +
(*((uint8 *)address) << 24) );
#endif /* LSB_FIRST */
}
else return *(uint32 *)address;
}
INLINE void WRITE_LONG(void *address, uint32 data)
{
if ((uint32)address & 3)
{
#ifdef LSB_FIRST
*((uint8 *)address) = data;
*((uint8 *)address+1) = (data >> 8);
*((uint8 *)address+2) = (data >> 16);
*((uint8 *)address+3) = (data >> 24);
#else
*((uint8 *)address+3) = data;
*((uint8 *)address+2) = (data >> 8);
*((uint8 *)address+1) = (data >> 16);
*((uint8 *)address) = (data >> 24);
#endif /* LSB_FIRST */
return;
}
else *(uint32 *)address = data;
}
#endif /* ALIGN_LONG */
/* Draw 2-cell column (8-pixels high) */
/*
Pattern cache base address: VHN NNNNNNNN NNYYYxxx
with :
x = Pattern Pixel (0-7)
Y = Pattern Row (0-7)
N = Pattern Number (0-2047) from pattern attribute
H = Horizontal Flip bit from pattern attribute
V = Vertical Flip bit from pattern attribute
*/
#define GET_LSB_TILE(ATTR, LINE) \
atex = atex_table[(ATTR >> 13) & 7]; \
src = (uint32 *)&bg_pattern_cache[(ATTR & 0x00001FFF) << 6 | (LINE)];
#define GET_MSB_TILE(ATTR, LINE) \
atex = atex_table[(ATTR >> 29) & 7]; \
src = (uint32 *)&bg_pattern_cache[(ATTR & 0x1FFF0000) >> 10 | (LINE)];
/* Draw 2-cell column (16 pixels high) */
/*
Pattern cache base address: VHN NNNNNNNN NYYYYxxx
with :
x = Pattern Pixel (0-7)
Y = Pattern Row (0-15)
N = Pattern Number (0-1023)
H = Horizontal Flip bit
V = Vertical Flip bit
*/
#define GET_LSB_TILE_IM2(ATTR, LINE) \
atex = atex_table[(ATTR >> 13) & 7]; \
src = (uint32 *)&bg_pattern_cache[((ATTR & 0x000003FF) << 7 | (ATTR & 0x00001800) << 6 | (LINE)) ^ ((ATTR & 0x00001000) >> 6)];
#define GET_MSB_TILE_IM2(ATTR, LINE) \
atex = atex_table[(ATTR >> 29) & 7]; \
src = (uint32 *)&bg_pattern_cache[((ATTR & 0x03FF0000) >> 9 | (ATTR & 0x18000000) >> 10 | (LINE)) ^ ((ATTR & 0x10000000) >> 22)];
/*
One column = 2 tiles
Two pattern attributes are written in VRAM as two consecutives 16-bit words:
P = priority bit
C = color palette (2 bits)
V = Vertical Flip bit
H = Horizontal Flip bit
N = Pattern Number (11 bits)
(MSB) PCCVHNNN NNNNNNNN (LSB) (MSB) PCCVHNNN NNNNNNNN (LSB)
PATTERN1 PATTERN2
Both pattern attributes are read from VRAM as one 32-bit word:
LIT_ENDIAN: (MSB) PCCVHNNN NNNNNNNN PCCVHNNN NNNNNNNN (LSB)
PATTERN2 PATTERN1
BIG_ENDIAN: (MSB) PCCVHNNN NNNNNNNN PCCVHNNN NNNNNNNN (LSB)
PATTERN1 PATTERN2
In line buffers, one pixel = one byte: (msb) 0Pppcccc (lsb)
with:
P = priority bit (from pattern attribute)
p = color palette (from pattern attribute)
c = color data (from pattern cache)
One pattern = 8 pixels = 8 bytes = two 32-bit writes per pattern
*/
#ifdef ALIGN_LONG
#ifdef LSB_FIRST
#define DRAW_COLUMN(ATTR, LINE) \
GET_LSB_TILE(ATTR, LINE) \
WRITE_LONG(dst, src[0] | atex); \
dst++; \
WRITE_LONG(dst, src[1] | atex); \
dst++; \
GET_MSB_TILE(ATTR, LINE) \
WRITE_LONG(dst, src[0] | atex); \
dst++; \
WRITE_LONG(dst, src[1] | atex); \
dst++;
#define DRAW_COLUMN_IM2(ATTR, LINE) \
GET_LSB_TILE_IM2(ATTR, LINE) \
WRITE_LONG(dst, src[0] | atex); \
dst++; \
WRITE_LONG(dst, src[1] | atex); \
dst++; \
GET_MSB_TILE_IM2(ATTR, LINE) \
WRITE_LONG(dst, src[0] | atex); \
dst++; \
WRITE_LONG(dst, src[1] | atex); \
dst++;
#else
#define DRAW_COLUMN(ATTR, LINE) \
GET_MSB_TILE(ATTR, LINE) \
WRITE_LONG(dst, src[0] | atex); \
dst++; \
WRITE_LONG(dst, src[1] | atex); \
dst++; \
GET_LSB_TILE(ATTR, LINE) \
WRITE_LONG(dst, src[0] | atex); \
dst++; \
WRITE_LONG(dst, src[1] | atex); \
dst++;
#define DRAW_COLUMN_IM2(ATTR, LINE) \
GET_MSB_TILE_IM2(ATTR, LINE) \
WRITE_LONG(dst, src[0] | atex); \
dst++; \
WRITE_LONG(dst, src[1] | atex); \
dst++; \
GET_LSB_TILE_IM2(ATTR, LINE) \
WRITE_LONG(dst, src[0] | atex); \
dst++; \
WRITE_LONG(dst, src[1] | atex); \
dst++;
#endif
#else /* NOT ALIGNED */
#ifdef LSB_FIRST
#define DRAW_COLUMN(ATTR, LINE) \
GET_LSB_TILE(ATTR, LINE) \
*dst++ = (src[0] | atex); \
*dst++ = (src[1] | atex); \
GET_MSB_TILE(ATTR, LINE) \
*dst++ = (src[0] | atex); \
*dst++ = (src[1] | atex);
#define DRAW_COLUMN_IM2(ATTR, LINE) \
GET_LSB_TILE_IM2(ATTR, LINE) \
*dst++ = (src[0] | atex); \
*dst++ = (src[1] | atex); \
GET_MSB_TILE_IM2(ATTR, LINE) \
*dst++ = (src[0] | atex); \
*dst++ = (src[1] | atex);
#else
#define DRAW_COLUMN(ATTR, LINE) \
GET_MSB_TILE(ATTR, LINE) \
*dst++ = (src[0] | atex); \
*dst++ = (src[1] | atex); \
GET_LSB_TILE(ATTR, LINE) \
*dst++ = (src[0] | atex); \
*dst++ = (src[1] | atex);
#define DRAW_COLUMN_IM2(ATTR, LINE) \
GET_MSB_TILE_IM2(ATTR, LINE) \
*dst++ = (src[0] | atex); \
*dst++ = (src[1] | atex); \
GET_LSB_TILE_IM2(ATTR, LINE) \
*dst++ = (src[0] | atex); \
*dst++ = (src[1] | atex);
#endif
#endif /* ALIGN_LONG */
#ifdef ALT_RENDERER
/* Draw background tiles directly using priority look-up table */
/* SRC_A = layer A rendered pixel line (4 bytes = 4 pixels at once) */
/* SRC_B = layer B cached pixel line (4 bytes = 4 pixels at once) */
/* Note: cache address is always aligned so no need to use READ_LONG macro */
/* This might be faster or slower than original method, depending on */
/* architecture (x86, PowerPC), cache size, memory access speed, etc... */
#ifdef LSB_FIRST
#define DRAW_BG_TILE(SRC_A, SRC_B) \
*lb++ = table[((SRC_B << 8) & 0xff00) | (SRC_A & 0xff)]; \
*lb++ = table[(SRC_B & 0xff00) | ((SRC_A >> 8) & 0xff)]; \
*lb++ = table[((SRC_B >> 8) & 0xff00) | ((SRC_A >> 16) & 0xff)]; \
*lb++ = table[((SRC_B >> 16) & 0xff00) | ((SRC_A >> 24) & 0xff)];
#else
#define DRAW_BG_TILE(SRC_A, SRC_B) \
*lb++ = table[((SRC_B >> 16) & 0xff00) | ((SRC_A >> 24) & 0xff)]; \
*lb++ = table[((SRC_B >> 8) & 0xff00) | ((SRC_A >> 16) & 0xff)]; \
*lb++ = table[(SRC_B & 0xff00) | ((SRC_A >> 8) & 0xff)]; \
*lb++ = table[((SRC_B << 8) & 0xff00) | (SRC_A & 0xff)];
#endif
#ifdef ALIGN_LONG
#ifdef LSB_FIRST
#define DRAW_BG_COLUMN(ATTR, LINE, SRC_A, SRC_B) \
GET_LSB_TILE(ATTR, LINE) \
SRC_A = READ_LONG((uint32 *)lb); \
SRC_B = (src[0] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B) \
SRC_A = READ_LONG((uint32 *)lb); \
SRC_B = (src[1] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B) \
GET_MSB_TILE(ATTR, LINE) \
SRC_A = READ_LONG((uint32 *)lb); \
SRC_B = (src[0] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B) \
SRC_A = READ_LONG((uint32 *)lb); \
SRC_B = (src[1] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B)
#define DRAW_BG_COLUMN_IM2(ATTR, LINE, SRC_A, SRC_B) \
GET_LSB_TILE_IM2(ATTR, LINE) \
SRC_A = READ_LONG((uint32 *)lb); \
SRC_B = (src[0] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B) \
SRC_A = READ_LONG((uint32 *)lb); \
SRC_B = (src[1] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B) \
GET_MSB_TILE_IM2(ATTR, LINE) \
SRC_A = READ_LONG((uint32 *)lb); \
SRC_B = (src[0] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B) \
SRC_A = READ_LONG((uint32 *)lb); \
SRC_B = (src[1] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B)
#else
#define DRAW_BG_COLUMN(ATTR, LINE, SRC_A, SRC_B) \
GET_MSB_TILE(ATTR, LINE) \
SRC_A = READ_LONG((uint32 *)lb); \
SRC_B = (src[0] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B) \
SRC_A = READ_LONG((uint32 *)lb); \
SRC_B = (src[1] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B) \
GET_LSB_TILE(ATTR, LINE) \
SRC_A = READ_LONG((uint32 *)lb); \
SRC_B = (src[0] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B) \
SRC_A = READ_LONG((uint32 *)lb); \
SRC_B = (src[1] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B)
#define DRAW_BG_COLUMN_IM2(ATTR, LINE, SRC_A, SRC_B) \
GET_MSB_TILE_IM2(ATTR, LINE) \
SRC_A = READ_LONG((uint32 *)lb); \
SRC_B = (src[0] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B) \
SRC_A = READ_LONG((uint32 *)lb); \
SRC_B = (src[1] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B) \
GET_LSB_TILE_IM2(ATTR, LINE) \
SRC_A = READ_LONG((uint32 *)lb); \
SRC_B = (src[0] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B) \
SRC_A = READ_LONG((uint32 *)lb); \
SRC_B = (src[1] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B)
#endif
#else /* NOT ALIGNED */
#ifdef LSB_FIRST
#define DRAW_BG_COLUMN(ATTR, LINE, SRC_A, SRC_B) \
GET_LSB_TILE(ATTR, LINE) \
SRC_A = *(uint32 *)(lb); \
SRC_B = (src[0] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B) \
SRC_A = *(uint32 *)(lb); \
SRC_B = (src[1] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B) \
GET_MSB_TILE(ATTR, LINE) \
SRC_A = *(uint32 *)(lb); \
SRC_B = (src[0] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B) \
SRC_A = *(uint32 *)(lb); \
SRC_B = (src[1] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B)
#define DRAW_BG_COLUMN_IM2(ATTR, LINE, SRC_A, SRC_B) \
GET_LSB_TILE_IM2(ATTR, LINE) \
SRC_A = *(uint32 *)(lb); \
SRC_B = (src[0] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B) \
SRC_A = *(uint32 *)(lb); \
SRC_B = (src[1] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B) \
GET_MSB_TILE_IM2(ATTR, LINE) \
SRC_A = *(uint32 *)(lb); \
SRC_B = (src[0] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B) \
SRC_A = *(uint32 *)(lb); \
SRC_B = (src[1] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B)
#else
#define DRAW_BG_COLUMN(ATTR, LINE, SRC_A, SRC_B) \
GET_MSB_TILE(ATTR, LINE) \
SRC_A = *(uint32 *)(lb); \
SRC_B = (src[0] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B) \
SRC_A = *(uint32 *)(lb); \
SRC_B = (src[1] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B) \
GET_LSB_TILE(ATTR, LINE) \
SRC_A = *(uint32 *)(lb); \
SRC_B = (src[0] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B) \
SRC_A = *(uint32 *)(lb); \
SRC_B = (src[1] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B)
#define DRAW_BG_COLUMN_IM2(ATTR, LINE, SRC_A, SRC_B) \
GET_MSB_TILE_IM2(ATTR, LINE) \
SRC_A = *(uint32 *)(lb); \
SRC_B = (src[0] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B) \
SRC_A = *(uint32 *)(lb); \
SRC_B = (src[1] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B) \
GET_LSB_TILE_IM2(ATTR, LINE) \
SRC_A = *(uint32 *)(lb); \
SRC_B = (src[0] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B) \
SRC_A = *(uint32 *)(lb); \
SRC_B = (src[1] | atex); \
DRAW_BG_TILE(SRC_A, SRC_B)
#endif
#endif /* ALIGN_LONG */
#endif /* ALT_RENDERER */
#define DRAW_SPRITE_TILE(WIDTH,ATTR,TABLE) \
for (i=0;i<WIDTH;i++) \
{ \
temp = *src++; \
if (temp & 0x0f) \
{ \
temp |= (lb[i] << 8); \
lb[i] = TABLE[temp | ATTR]; \
status |= ((temp & 0x8000) >> 10); \
} \
}
#define DRAW_SPRITE_TILE_ACCURATE(WIDTH,ATTR,TABLE) \
for (i=0;i<WIDTH;i++) \
{ \
temp = *src++; \
if (temp & 0x0f) \
{ \
temp |= (lb[i] << 8); \
lb[i] = TABLE[temp | ATTR]; \
if ((temp & 0x8000) && !(status & 0x20)) \
{ \
spr_col = (v_counter << 8) | ((xpos + i + 13) >> 1); \
status |= 0x20; \
} \
} \
}
#define DRAW_SPRITE_TILE_ACCURATE_2X(WIDTH,ATTR,TABLE) \
for (i=0;i<WIDTH;i+=2) \
{ \
temp = *src++; \
if (temp & 0x0f) \
{ \
temp |= (lb[i] << 8); \
lb[i] = TABLE[temp | ATTR]; \
if ((temp & 0x8000) && !(status & 0x20)) \
{ \
spr_col = (v_counter << 8) | ((xpos + i + 13) >> 1); \
status |= 0x20; \
} \
temp &= 0x00FF; \
temp |= (lb[i+1] << 8); \
lb[i+1] = TABLE[temp | ATTR]; \
if ((temp & 0x8000) && !(status & 0x20)) \
{ \
spr_col = (v_counter << 8) | ((xpos + i + 1 + 13) >> 1); \
status |= 0x20; \
} \
} \
}
/* Pixels conversion macro */
/* 4-bit color channels are either compressed to 2/3-bit or dithered to 5/6/8-bit equivalents */
/* 3:3:2 RGB */
#if defined(USE_8BPP_RENDERING)
#define MAKE_PIXEL(r,g,b) (((r) >> 1) << 5 | ((g) >> 1) << 2 | (b) >> 2)
/* 5:5:5 RGB */
#elif defined(USE_15BPP_RENDERING)
#define MAKE_PIXEL(r,g,b) ((r) << 11 | ((r) >> 3) << 10 | (g) << 6 | ((g) >> 3) << 5 | (b) << 1 | (b) >> 3)
/* 5:6:5 RGB */
#elif defined(USE_16BPP_RENDERING)
#define MAKE_PIXEL(r,g,b) ((r) << 12 | ((r) >> 3) << 11 | (g) << 7 | ((g) >> 2) << 5 | (b) << 1 | (b) >> 3)
/* 8:8:8 RGB */
#elif defined(USE_32BPP_RENDERING)
#define MAKE_PIXEL(r,g,b) ((r) << 20 | (r) << 16 | (g) << 12 | (g) << 8 | (b) << 4 | (b))
#endif
/* Window & Plane A clipping */
static struct clip_t
{
uint8 left;
uint8 right;
uint8 enable;
} clip[2];
/* Pattern attribute (priority + palette bits) expansion table */
static const uint32 atex_table[] =
{
0x00000000,
0x10101010,
0x20202020,
0x30303030,
0x40404040,
0x50505050,
0x60606060,
0x70707070
};
/* fixed Master System palette for Modes 0,1,2,3 */
static const uint8 tms_crom[16] =
{
0x00, 0x00, 0x08, 0x0C,
0x10, 0x30, 0x01, 0x3C,
0x02, 0x03, 0x05, 0x0F,
0x04, 0x33, 0x15, 0x3F
};
/* original SG-1000 palette */
#if defined(USE_8BPP_RENDERING)
static const uint8 tms_palette[16] =
{
0x00, 0x00, 0x39, 0x79,
0x4B, 0x6F, 0xC9, 0x5B,
0xE9, 0xED, 0xD5, 0xD9,
0x35, 0xCE, 0xDA, 0xFF
};
#elif defined(USE_15BPP_RENDERING)
static const uint16 tms_palette[16] =
{
0x0000, 0x0000, 0x1308, 0x2F6F,
0x295D, 0x3DDF, 0x6949, 0x23BE,
0x7D4A, 0x7DEF, 0x6B0A, 0x7330,
0x12A7, 0x6177, 0x6739, 0x7FFF
};
#elif defined(USE_16BPP_RENDERING)
static const uint16 tms_palette[16] =
{
0x0000, 0x0000, 0x2648, 0x5ECF,
0x52BD, 0x7BBE, 0xD289, 0x475E,
0xF2AA, 0xFBCF, 0xD60A, 0xE670,
0x2567, 0xC2F7, 0xCE59, 0xFFFF
};
#elif defined(USE_32BPP_RENDERING)
static const uint32 tms_palette[16] =
{
0x000000, 0x000000, 0x21C842, 0x5EDC78,
0x5455ED, 0x7D76FC, 0xD4524D, 0x42EBF5,
0xFC5554, 0xFF7978, 0xD4C154, 0xE6CE80,
0x21B03B, 0xC95BB4, 0xCCCCCC, 0xFFFFFF
};
#endif
/* Cached and flipped patterns */
static uint8 bg_pattern_cache[0x80000];
/* Sprite pattern name offset look-up table (Mode 5) */
static uint8 name_lut[0x400];
/* Bitplane to packed pixel look-up table (Mode 4) */
static uint32 bp_lut[0x10000];
/* Layer priority pixel look-up tables */
static uint8 lut[LUT_MAX][LUT_SIZE];
/* Output pixel data look-up tables*/
static PIXEL_OUT_T pixel[0x100];
static PIXEL_OUT_T pixel_lut[3][0x200];
static PIXEL_OUT_T pixel_lut_m4[0x40];
/* Background & Sprite line buffers */
static uint8 linebuf[2][0x200];
/* Sprite limit flag */
static uint8 spr_ovr;
/* Sprites parsing */
static struct
{
uint16 ypos;
uint16 xpos;
uint16 attr;
uint16 size;
} object_info[20];
/* Sprite Counter */
uint8 object_count;
/* Sprite Collision Info */
uint16 spr_col;
/* Function pointers */
void (*render_bg)(int line, int width);
void (*render_obj)(int max_width);
void (*parse_satb)(int line);
void (*update_bg_pattern_cache)(int index);
/*--------------------------------------------------------------------------*/
/* Sprite pattern name offset look-up table function (Mode 5) */
/*--------------------------------------------------------------------------*/
static void make_name_lut(void)
{
int vcol, vrow;
int width, height;
int flipx, flipy;
int i;
for (i = 0; i < 0x400; i += 1)
{
/* Sprite settings */
vcol = i & 3;
vrow = (i >> 2) & 3;
height = (i >> 4) & 3;
width = (i >> 6) & 3;
flipx = (i >> 8) & 1;
flipy = (i >> 9) & 1;
if ((vrow > height) || vcol > width)
{
/* Invalid settings (unused) */
name_lut[i] = -1;
}
else
{
/* Adjust column & row index if sprite is flipped */
if(flipx) vcol = (width - vcol);
if(flipy) vrow = (height - vrow);
/* Pattern offset (pattern order is up->down->left->right) */
name_lut[i] = vrow + (vcol * (height + 1));
}
}
}
/*--------------------------------------------------------------------------*/
/* Bitplane to packed pixel look-up table function (Mode 4) */
/*--------------------------------------------------------------------------*/
static void make_bp_lut(void)
{
int x,i,j;
uint32 out;
/* ---------------------- */
/* Pattern color encoding */
/* -------------------------------------------------------------------------*/
/* 4 byteplanes are required to define one pattern line (8 pixels) */
/* A single pixel color is coded with 4 bits (c3 c2 c1 c0) */
/* Each bit is coming from byteplane bits, as explained below: */
/* pixel 0: c3 = bp3 bit 7, c2 = bp2 bit 7, c1 = bp1 bit 7, c0 = bp0 bit 7 */
/* pixel 1: c3 = bp3 bit 6, c2 = bp2 bit 6, c1 = bp1 bit 6, c0 = bp0 bit 6 */
/* ... */
/* pixel 7: c3 = bp3 bit 0, c2 = bp2 bit 0, c1 = bp1 bit 0, c0 = bp0 bit 0 */
/* -------------------------------------------------------------------------*/
for(i = 0; i < 0x100; i++)
for(j = 0; j < 0x100; j++)
{
out = 0;
for(x = 0; x < 8; x++)
{
/* pixel line data = hh00gg00ff00ee00dd00cc00bb00aa00 (32-bit) */
/* aa-hh = upper or lower 2-bit values of pixels 0-7 (shifted) */
out |= (j & (0x80 >> x)) ? (uint32)(8 << (x << 2)) : 0;
out |= (i & (0x80 >> x)) ? (uint32)(4 << (x << 2)) : 0;
}
/* i = low byte in VRAM (bp0 or bp2) */
/* j = high byte in VRAM (bp1 or bp3) */
#ifdef LSB_FIRST
bp_lut[(j << 8) | (i)] = out;
#else
bp_lut[(i << 8) | (j)] = out;
#endif
}
}
/*--------------------------------------------------------------------------*/
/* Layers priority pixel look-up tables functions */
/*--------------------------------------------------------------------------*/
/* Input (bx): d5-d0=color, d6=priority, d7=unused */
/* Input (ax): d5-d0=color, d6=priority, d7=unused */
/* Output: d5-d0=color, d6=priority, d7=zero */
static uint32 make_lut_bg(uint32 bx, uint32 ax)
{
int bf = (bx & 0x7F);
int bp = (bx & 0x40);
int b = (bx & 0x0F);
int af = (ax & 0x7F);
int ap = (ax & 0x40);
int a = (ax & 0x0F);
int c = (ap ? (a ? af : bf) : (bp ? (b ? bf : af) : (a ? af : bf)));
/* Strip palette & priority bits from transparent pixels */
if((c & 0x0F) == 0x00) c &= 0x80;
return (c);
}
/* Input (bx): d5-d0=color, d6=priority, d7=unused */
/* Input (sx): d5-d0=color, d6=priority, d7=unused */
/* Output: d5-d0=color, d6=priority, d7=intensity select (0=half/1=normal) */
static uint32 make_lut_bg_ste(uint32 bx, uint32 ax)
{
int bf = (bx & 0x7F);
int bp = (bx & 0x40);
int b = (bx & 0x0F);
int af = (ax & 0x7F);
int ap = (ax & 0x40);
int a = (ax & 0x0F);
int c = (ap ? (a ? af : bf) : (bp ? (b ? bf : af) : (a ? af : bf)));
/* Half intensity when both pixels are low priority */
c |= ((ap | bp) << 1);
/* Strip palette & priority bits from transparent pixels */
if((c & 0x0F) == 0x00) c &= 0x80;
return (c);
}
/* Input (bx): d5-d0=color, d6=priority/1, d7=sprite pixel marker */
/* Input (sx): d5-d0=color, d6=priority, d7=unused */
/* Output: d5-d0=color, d6=priority, d7=sprite pixel marker */
static uint32 make_lut_obj(uint32 bx, uint32 sx)
{
int c;
int bf = (bx & 0x7F);
int bs = (bx & 0x80);
int sf = (sx & 0x7F);
if((sx & 0x0F) == 0) return bx;
c = (bs ? bf : sf);
/* Strip palette bits from transparent pixels */
if((c & 0x0F) == 0x00) c &= 0xC0;
return (c | 0x80);
}
/* Input (bx): d5-d0=color, d6=priority, d7=opaque sprite pixel marker */
/* Input (sx): d5-d0=color, d6=priority, d7=unused */
/* Output: d5-d0=color, d6=zero/priority, d7=opaque sprite pixel marker */
static uint32 make_lut_bgobj(uint32 bx, uint32 sx)
{
int c;
int bf = (bx & 0x3F);
int bs = (bx & 0x80);
int bp = (bx & 0x40);
int b = (bx & 0x0F);
int sf = (sx & 0x3F);
int sp = (sx & 0x40);
int s = (sx & 0x0F);
if(s == 0) return bx;
/* Previous sprite has higher priority */
if(bs) return bx;
c = (sp ? sf : (bp ? (b ? bf : sf) : sf));
/* Strip palette & priority bits from transparent pixels */
if((c & 0x0F) == 0x00) c &= 0x80;
return (c | 0x80);
}
/* Input (bx): d5-d0=color, d6=priority, d7=intensity (half/normal) */
/* Input (sx): d5-d0=color, d6=priority, d7=sprite marker */
/* Output: d5-d0=color, d6=intensity (half/normal), d7=(double/invalid) */
static uint32 make_lut_bgobj_ste(uint32 bx, uint32 sx)
{
int c;
int bf = (bx & 0x3F);
int bp = (bx & 0x40);
int b = (bx & 0x0F);
int bi = (bx & 0x80) >> 1;
int sf = (sx & 0x3F);
int sp = (sx & 0x40);
int s = (sx & 0x0F);
int si = sp | bi;
if(sp)
{
if(s)
{
if((sf & 0x3E) == 0x3E)
{
if(sf & 1)
{
c = (bf | 0x00);
}
else
{
c = (bx & 0x80) ? (bf | 0x80) : (bf | 0x40);
}
}
else
{
if(sf == 0x0E || sf == 0x1E || sf == 0x2E)
{
c = (sf | 0x40);
}
else
{
c = (sf | si);
}
}
}
else
{
c = (bf | bi);
}
}
else
{
if(bp)
{
if(b)
{
c = (bf | bi);
}
else
{
if(s)
{
if((sf & 0x3E) == 0x3E)
{
if(sf & 1)
{
c = (bf | 0x00);
}
else
{
c = (bx & 0x80) ? (bf | 0x80) : (bf | 0x40);
}
}
else
{
if(sf == 0x0E || sf == 0x1E || sf == 0x2E)
{
c = (sf | 0x40);
}
else
{
c = (sf | si);
}
}
}
else
{
c = (bf | bi);
}
}
}
else
{
if(s)
{
if((sf & 0x3E) == 0x3E)
{
if(sf & 1)
{
c = (bf | 0x00);
}
else
{
c = (bx & 0x80) ? (bf | 0x80) : (bf | 0x40);
}
}
else
{
if(sf == 0x0E || sf == 0x1E || sf == 0x2E)
{
c = (sf | 0x40);
}
else
{
c = (sf | si);
}
}
}
else
{
c = (bf | bi);
}
}
}
if((c & 0x0f) == 0x00) c &= 0xC0;
return (c);
}
/* Input (bx): d3-d0=color, d4=palette, d5=priority, d6=zero, d7=sprite pixel marker */
/* Input (sx): d3-d0=color, d7-d4=zero */
/* Output: d3-d0=color, d4=palette, d5=zero/priority, d6=zero, d7=sprite pixel marker */
static uint32 make_lut_bgobj_m4(uint32 bx, uint32 sx)
{
int c;
int bf = (bx & 0x3F);
int bs = (bx & 0x80);
int bp = (bx & 0x20);
int b = (bx & 0x0F);
int s = (sx & 0x0F);
int sf = (s | 0x10); /* force palette bit */
/* Transparent sprite pixel */
if(s == 0) return bx;
/* Previous sprite has higher priority */
if(bs) return bx;
/* note: priority bit is always 0 for Modes 0,1,2,3 */
c = (bp ? (b ? bf : sf) : sf);
return (c | 0x80);
}
/*--------------------------------------------------------------------------*/
/* Pixel layer merging function */
/*--------------------------------------------------------------------------*/
INLINE void merge(uint8 *srca, uint8 *srcb, uint8 *dst, uint8 *table, int width)
{
do
{
*dst++ = table[(*srcb++ << 8) | (*srca++)];
}
while (--width);
}
/*--------------------------------------------------------------------------*/
/* Pixel color lookup tables initialization */
/*--------------------------------------------------------------------------*/
static void palette_init(void)
{
int r, g, b, i;
/************************************************/
/* Each R,G,B color channel is 4-bit with a */
/* total of 15 different intensity levels. */
/* */
/* Color intensity depends on the mode: */
/* */
/* normal : xxx0 (0-14) */
/* shadow : 0xxx (0-7) */
/* highlight: 1xxx - 1 (7-14) */
/* mode4 : xxxx(*) (0-15) */
/* GG mode : xxxx (0-15) */
/* */
/* with x = original CRAM value (2, 3 or 4-bit) */
/* (*) 2-bit CRAM value is expanded to 4-bit */
/************************************************/
/* Initialize Mode 5 pixel color look-up tables */
for (i = 0; i < 0x200; i++)
{
/* CRAM 9-bit value (BBBGGGRRR) */
r = (i >> 0) & 7;
g = (i >> 3) & 7;
b = (i >> 6) & 7;
/* Convert to output pixel format */
pixel_lut[0][i] = MAKE_PIXEL(r,g,b);
pixel_lut[1][i] = MAKE_PIXEL(r<<1,g<<1,b<<1);
pixel_lut[2][i] = MAKE_PIXEL(r+7,g+7,b+7);
}
/* Initialize Mode 4 pixel color look-up table */
for (i = 0; i < 0x40; i++)
{
/* CRAM 6-bit value (000BBGGRR) */
r = (i >> 0) & 3;
g = (i >> 2) & 3;
b = (i >> 4) & 3;
/* Expand to full range & convert to output pixel format */
pixel_lut_m4[i] = MAKE_PIXEL((r << 2) | r, (g << 2) | g, (b << 2) | b);
}
}
/*--------------------------------------------------------------------------*/
/* Color palette update functions */
/*--------------------------------------------------------------------------*/
void color_update_m4(int index, unsigned int data)
{
switch (system_hw)
{
case SYSTEM_GG:
{
/* CRAM value (BBBBGGGGRRRR) */
int r = (data >> 0) & 0x0F;
int g = (data >> 4) & 0x0F;
int b = (data >> 8) & 0x0F;
/* Convert to output pixel */
data = MAKE_PIXEL(r,g,b);
break;
}
case SYSTEM_SG:
{
/* Fixed TMS9918 palette */
if (index & 0x0F)
{
/* Colors 1-15 */
data = tms_palette[index & 0x0F];
}
else
{
/* Backdrop color */
data = tms_palette[reg[7] & 0x0F];
}
break;
}
default:
{
/* Test M4 bit */
if (!(reg[0] & 0x04))
{
if (system_hw & SYSTEM_MD)
{
/* Invalid Mode (black screen) */
data = 0x00;
}
else if (system_hw != SYSTEM_GGMS)
{
/* Fixed CRAM palette */
if (index & 0x0F)
{
/* Colors 1-15 */
data = tms_crom[index & 0x0F];
}
else
{
/* Backdrop color */
data = tms_crom[reg[7] & 0x0F];
}
}
}
/* Mode 4 palette */
data = pixel_lut_m4[data & 0x3F];
break;
}
}
/* Input pixel: x0xiiiii (normal) or 01000000 (backdrop) */
if (reg[0] & 0x04)
{
/* Mode 4 */
pixel[0x00 | index] = data;
pixel[0x20 | index] = data;
pixel[0x80 | index] = data;
pixel[0xA0 | index] = data;
}
else
{
/* TMS9918 modes (palette bit forced to 1 because Game Gear uses CRAM palette #1) */
if ((index == 0x40) || (index == (0x10 | (reg[7] & 0x0F))))
{
/* Update backdrop color */
pixel[0x40] = data;
/* Update transparent color */
pixel[0x10] = data;
pixel[0x30] = data;
pixel[0x90] = data;
pixel[0xB0] = data;
}
if (index & 0x0F)
{
/* update non-transparent colors */
pixel[0x00 | index] = data;
pixel[0x20 | index] = data;
pixel[0x80 | index] = data;
pixel[0xA0 | index] = data;
}
}
}
void color_update_m5(int index, unsigned int data)
{
/* Palette Mode */
if (!(reg[0] & 0x04))
{
/* Color value is limited to 00X00X00X */
data &= 0x49;
}
if(reg[12] & 0x08)
{
/* Mode 5 (Shadow/Normal/Highlight) */
pixel[0x00 | index] = pixel_lut[0][data];
pixel[0x40 | index] = pixel_lut[1][data];
pixel[0x80 | index] = pixel_lut[2][data];
}
else
{
/* Mode 5 (Normal) */
data = pixel_lut[1][data];
/* Input pixel: xxiiiiii */
pixel[0x00 | index] = data;
pixel[0x40 | index] = data;
pixel[0x80 | index] = data;
}
}
/*--------------------------------------------------------------------------*/
/* Background layers rendering functions */
/*--------------------------------------------------------------------------*/
/* Graphics I */
void render_bg_m0(int line, int width)
{
uint8 color, pattern;
uint16 name;
uint8 *lb = &linebuf[0][0x20];
uint8 *nt = &vram[((reg[2] << 10) & 0x3C00) + ((line & 0xF8) << 2)];
uint8 *ct = &vram[((reg[3] << 6) & 0x3FC0)];
uint8 *pg = &vram[((reg[4] << 11) & 0x3800) + (line & 7)];
/* 32 x 8 pixels */
width = 32;
do
{
name = *nt++;
color = ct[name >> 3];
pattern = pg[name << 3];
*lb++ = 0x10 | ((color >> (((pattern >> 7) & 1) << 2)) & 0x0F);
*lb++ = 0x10 | ((color >> (((pattern >> 6) & 1) << 2)) & 0x0F);
*lb++ = 0x10 | ((color >> (((pattern >> 5) & 1) << 2)) & 0x0F);
*lb++ = 0x10 | ((color >> (((pattern >> 4) & 1) << 2)) & 0x0F);
*lb++ = 0x10 | ((color >> (((pattern >> 3) & 1) << 2)) & 0x0F);
*lb++ = 0x10 | ((color >> (((pattern >> 2) & 1) << 2)) & 0x0F);
*lb++ = 0x10 | ((color >> (((pattern >> 1) & 1) << 2)) & 0x0F);
*lb++ = 0x10 | ((color >> (((pattern >> 0) & 1) << 2)) & 0x0F);
}
while (--width);
}
/* Text */
void render_bg_m1(int line, int width)
{
uint8 pattern;
uint8 color = reg[7];
uint8 *lb = &linebuf[0][0x20];
uint8 *nt = &vram[((reg[2] << 10) & 0x3C00) + ((line >> 3) * 40)];
uint8 *pg = &vram[((reg[4] << 11) & 0x3800) + (line & 7)];
/* Left border (8 pixels) */
memset (lb, 0x40, 8);
lb += 8;
/* 40 x 6 pixels */
width = 40;
do
{
pattern = pg[*nt++];
*lb++ = 0x10 | ((color >> (((pattern >> 7) & 1) << 2)) & 0x0F);
*lb++ = 0x10 | ((color >> (((pattern >> 6) & 1) << 2)) & 0x0F);
*lb++ = 0x10 | ((color >> (((pattern >> 5) & 1) << 2)) & 0x0F);
*lb++ = 0x10 | ((color >> (((pattern >> 4) & 1) << 2)) & 0x0F);
*lb++ = 0x10 | ((color >> (((pattern >> 3) & 1) << 2)) & 0x0F);
*lb++ = 0x10 | ((color >> (((pattern >> 2) & 1) << 2)) & 0x0F);
}
while (--width);
/* Right borders (8 pixels) */
memset(lb, 0x40, 8);
}
/* Text + extended PG */
void render_bg_m1x(int line, int width)
{
uint8 pattern;
uint8 *pg;
uint8 color = reg[7];
uint8 *lb = &linebuf[0][0x20];
uint8 *nt = &vram[((reg[2] << 10) & 0x3C00) + ((line >> 3) * 40)];
uint16 pg_mask = ~0x3800 ^ (reg[4] << 11);
/* Unused bits used as a mask on TMS9918 & 315-5124 VDP only */
if (system_hw > SYSTEM_SMS)
{
pg_mask |= 0x1800;
}
pg = &vram[((0x2000 + ((line & 0xC0) << 5)) & pg_mask) + (line & 7)];
/* Left border (8 pixels) */
memset (lb, 0x40, 8);
lb += 8;
/* 40 x 6 pixels */
width = 40;
do
{
pattern = pg[*nt++ << 3];
*lb++ = 0x10 | ((color >> (((pattern >> 7) & 1) << 2)) & 0x0F);
*lb++ = 0x10 | ((color >> (((pattern >> 6) & 1) << 2)) & 0x0F);
*lb++ = 0x10 | ((color >> (((pattern >> 5) & 1) << 2)) & 0x0F);
*lb++ = 0x10 | ((color >> (((pattern >> 4) & 1) << 2)) & 0x0F);
*lb++ = 0x10 | ((color >> (((pattern >> 3) & 1) << 2)) & 0x0F);
*lb++ = 0x10 | ((color >> (((pattern >> 2) & 1) << 2)) & 0x0F);
}
while (--width);
/* Right borders (8 pixels) */
memset(lb, 0x40, 8);
}
/* Graphics II */
void render_bg_m2(int line, int width)
{
uint8 color, pattern;
uint16 name;
uint8 *ct, *pg;
uint8 *lb = &linebuf[0][0x20];
uint8 *nt = &vram[((reg[2] << 10) & 0x3C00) + ((line & 0xF8) << 2)];
uint16 ct_mask = ~0x3FC0 ^ (reg[3] << 6);
uint16 pg_mask = ~0x3800 ^ (reg[4] << 11);
/* Unused bits used as a mask on TMS9918 & 315-5124 VDP only */
if (system_hw > SYSTEM_SMS)
{
ct_mask |= 0x1FC0;
pg_mask |= 0x1800;
}
ct = &vram[((0x2000 + ((line & 0xC0) << 5)) & ct_mask) + (line & 7)];
pg = &vram[((0x2000 + ((line & 0xC0) << 5)) & pg_mask) + (line & 7)];
/* 32 x 8 pixels */
width = 32;
do
{
name = *nt++ << 3 ;
color = ct[name & ct_mask];
pattern = pg[name];
*lb++ = 0x10 | ((color >> (((pattern >> 7) & 1) << 2)) & 0x0F);
*lb++ = 0x10 | ((color >> (((pattern >> 6) & 1) << 2)) & 0x0F);
*lb++ = 0x10 | ((color >> (((pattern >> 5) & 1) << 2)) & 0x0F);
*lb++ = 0x10 | ((color >> (((pattern >> 4) & 1) << 2)) & 0x0F);
*lb++ = 0x10 | ((color >> (((pattern >> 3) & 1) << 2)) & 0x0F);
*lb++ = 0x10 | ((color >> (((pattern >> 2) & 1) << 2)) & 0x0F);
*lb++ = 0x10 | ((color >> (((pattern >> 1) & 1) << 2)) & 0x0F);
*lb++ = 0x10 | ((color >> (((pattern >> 0) & 1) << 2)) & 0x0F);
}
while (--width);
}
/* Multicolor */
void render_bg_m3(int line, int width)
{
uint8 color;
uint16 name;
uint8 *lb = &linebuf[0][0x20];
uint8 *nt = &vram[((reg[2] << 10) & 0x3C00) + ((line & 0xF8) << 2)];
uint8 *pg = &vram[((reg[4] << 11) & 0x3800) + ((line >> 2) & 7)];
/* 32 x 8 pixels */
width = 32;
do
{
name = *nt++;
color = pg[name << 3];
*lb++ = 0x10 | ((color >> 4) & 0x0F);
*lb++ = 0x10 | ((color >> 4) & 0x0F);
*lb++ = 0x10 | ((color >> 4) & 0x0F);
*lb++ = 0x10 | ((color >> 4) & 0x0F);
*lb++ = 0x10 | ((color >> 0) & 0x0F);
*lb++ = 0x10 | ((color >> 0) & 0x0F);
*lb++ = 0x10 | ((color >> 0) & 0x0F);
*lb++ = 0x10 | ((color >> 0) & 0x0F);
}
while (--width);
}
/* Multicolor + extended PG */
void render_bg_m3x(int line, int width)
{
uint8 color;
uint16 name;
uint8 *pg;
uint8 *lb = &linebuf[0][0x20];
uint8 *nt = &vram[((reg[2] << 10) & 0x3C00) + ((line & 0xF8) << 2)];
uint16 pg_mask = ~0x3800 ^ (reg[4] << 11);
/* Unused bits used as a mask on TMS9918 & 315-5124 VDP only */
if (system_hw > SYSTEM_SMS)
{
pg_mask |= 0x1800;
}
pg = &vram[((0x2000 + ((line & 0xC0) << 5)) & pg_mask) + ((line >> 2) & 7)];
/* 32 x 8 pixels */
width = 32;
do
{
name = *nt++;
color = pg[name << 3];
*lb++ = 0x10 | ((color >> 4) & 0x0F);
*lb++ = 0x10 | ((color >> 4) & 0x0F);
*lb++ = 0x10 | ((color >> 4) & 0x0F);
*lb++ = 0x10 | ((color >> 4) & 0x0F);
*lb++ = 0x10 | ((color >> 0) & 0x0F);
*lb++ = 0x10 | ((color >> 0) & 0x0F);
*lb++ = 0x10 | ((color >> 0) & 0x0F);
*lb++ = 0x10 | ((color >> 0) & 0x0F);
}
while (--width);
}
/* Invalid (2+3/1+2+3) */
void render_bg_inv(int line, int width)
{
uint8 color = reg[7];
uint8 *lb = &linebuf[0][0x20];
/* Left border (8 pixels) */
memset (lb, 0x40, 8);
lb += 8;
/* 40 x 6 pixels */
width = 40;
do
{
*lb++ = 0x10 | ((color >> 4) & 0x0F);
*lb++ = 0x10 | ((color >> 4) & 0x0F);
*lb++ = 0x10 | ((color >> 4) & 0x0F);
*lb++ = 0x10 | ((color >> 4) & 0x0F);
*lb++ = 0x10 | ((color >> 0) & 0x0F);
*lb++ = 0x10 | ((color >> 0) & 0x0F);
}
while (--width);
/* Right borders (8 pixels) */
memset(lb, 0x40, 8);
}
/* Mode 4 */
void render_bg_m4(int line, int width)
{
int column;
uint16 *nt;
uint32 attr, atex, *src;
/* Horizontal scrolling */
int index = ((reg[0] & 0x40) && (line < 0x10)) ? 0x100 : reg[0x08];
int shift = index & 7;
/* Background line buffer */
uint32 *dst = (uint32 *)&linebuf[0][0x20 + shift];
/* Vertical scrolling */
int v_line = line + vscroll;
/* Pattern name table mask */
uint16 nt_mask = ~0x3C00 ^ (reg[2] << 10);
/* Unused bits used as a mask on TMS9918 & 315-5124 VDP only */
if (system_hw > SYSTEM_SMS)
{
nt_mask |= 0x400;
}
/* Test for extended modes (Master System II & Game gear VDP only) */
if (bitmap.viewport.h > 192)
{
/* Vertical scroll mask */
v_line = v_line % 256;
/* Pattern name Table */
nt = (uint16 *)&vram[(0x3700 & nt_mask) + ((v_line >> 3) << 6)];
}
else
{
/* Vertical scroll mask */
v_line = v_line % 224;
/* Pattern name Table */
nt = (uint16 *)&vram[(0x3800 + ((v_line >> 3) << 6)) & nt_mask];
}
/* Pattern row index */
v_line = (v_line & 7) << 3;
/* Tile column index */
index = (0x100 - index) >> 3;
/* Clip left-most column if required */
if (shift)
{
memset(&linebuf[0][0x20], 0, shift);
index++;
}
/* Number of tiles to draw */
width >>= 3;
/* Draw tiles */
for(column = 0; column < width; column++, index++)
{
/* Stop vertical scrolling for rightmost eight tiles */
if((column == 24) && (reg[0] & 0x80))
{
/* Clear Pattern name table start address */
if (bitmap.viewport.h > 192)
{
nt = (uint16 *)&vram[(0x3700 & nt_mask) + ((line >> 3) << 6)];
}
else
{
nt = (uint16 *)&vram[(0x3800 + ((line >> 3) << 6)) & nt_mask];
}
/* Clear Pattern row index */
v_line = (line & 7) << 3;
}
/* Read name table attribute word */
attr = nt[index % width];
#ifndef LSB_FIRST
attr = (((attr & 0xFF) << 8) | ((attr & 0xFF00) >> 8));
#endif
/* Expand priority and palette bits */
atex = atex_table[(attr >> 11) & 3];
/* Cached pattern data line (4 bytes = 4 pixels at once) */
src = (uint32 *)&bg_pattern_cache[((attr & 0x7FF) << 6) | (v_line)];
/* Copy left & right half, adding the attribute bits in */
#ifdef ALIGN_DWORD
WRITE_LONG(dst, src[0] | atex);
dst++;
WRITE_LONG(dst, src[1] | atex);
dst++;
#else
*dst++ = (src[0] | atex);
*dst++ = (src[1] | atex);
#endif
}
}
/* Mode 5 */
#ifndef ALT_RENDERER
void render_bg_m5(int line, int width)
{
int column;
uint32 atex, atbuf, *src, *dst;
/* Common data */
uint32 xscroll = *(uint32 *)&vram[hscb + ((line & hscroll_mask) << 2)];
uint32 yscroll = *(uint32 *)&vsram[0];
uint32 pf_col_mask = playfield_col_mask;
uint32 pf_row_mask = playfield_row_mask;
uint32 pf_shift = playfield_shift;
/* Window & Plane A */
int a = (reg[18] & 0x1F) << 3;
int w = (reg[18] >> 7) & 1;
/* Plane B width */
int start = 0;
int end = width >> 4;
/* Plane B scroll */
#ifdef LSB_FIRST
uint32 shift = (xscroll >> 16) & 0x0F;
uint32 index = pf_col_mask + 1 - ((xscroll >> 20) & pf_col_mask);
uint32 v_line = (line + (yscroll >> 16)) & pf_row_mask;
#else
uint32 shift = (xscroll & 0x0F);
uint32 index = pf_col_mask + 1 - ((xscroll >> 4) & pf_col_mask);
uint32 v_line = (line + yscroll) & pf_row_mask;
#endif
/* Plane B name table */
uint32 *nt = (uint32 *)&vram[ntbb + (((v_line >> 3) << pf_shift) & 0x1FC0)];
/* Pattern row index */
v_line = (v_line & 7) << 3;
if(shift)
{
/* Plane B line buffer */
dst = (uint32 *)&linebuf[0][0x10 + shift];
atbuf = nt[(index - 1) & pf_col_mask];
DRAW_COLUMN(atbuf, v_line)
}
else
{
/* Plane B line buffer */
dst = (uint32 *)&linebuf[0][0x20];
}
for(column = 0; column < end; column++, index++)
{
atbuf = nt[index & pf_col_mask];
DRAW_COLUMN(atbuf, v_line)
}
if (w == (line >= a))
{
/* Window takes up entire line */
a = 0;
w = 1;
}
else
{
/* Window and Plane A share the line */
a = clip[0].enable;
w = clip[1].enable;
}
/* Plane A */
if (a)
{
/* Plane A width */
start = clip[0].left;
end = clip[0].right;
/* Plane A scroll */
#ifdef LSB_FIRST
shift = (xscroll & 0x0F);
index = pf_col_mask + start + 1 - ((xscroll >> 4) & pf_col_mask);
v_line = (line + yscroll) & pf_row_mask;
#else
shift = (xscroll >> 16) & 0x0F;
index = pf_col_mask + start + 1 - ((xscroll >> 20) & pf_col_mask);
v_line = (line + (yscroll >> 16)) & pf_row_mask;
#endif
/* Plane A name table */
nt = (uint32 *)&vram[ntab + (((v_line >> 3) << pf_shift) & 0x1FC0)];
/* Pattern row index */
v_line = (v_line & 7) << 3;
if(shift)
{
/* Plane A line buffer */
dst = (uint32 *)&linebuf[1][0x10 + shift + (start << 4)];
/* Window bug */
if (start)
{
atbuf = nt[index & pf_col_mask];
}
else
{
atbuf = nt[(index - 1) & pf_col_mask];
}
DRAW_COLUMN(atbuf, v_line)
}
else
{
/* Plane A line buffer */
dst = (uint32 *)&linebuf[1][0x20 + (start << 4)];
}
for(column = start; column < end; column++, index++)
{
atbuf = nt[index & pf_col_mask];
DRAW_COLUMN(atbuf, v_line)
}
/* Window width */
start = clip[1].left;
end = clip[1].right;
}
/* Window */
if (w)
{
/* Window name table */
nt = (uint32 *)&vram[ntwb | ((line >> 3) << (6 + (reg[12] & 1)))];
/* Pattern row index */
v_line = (line & 7) << 3;
/* Plane A line buffer */
dst = (uint32 *)&linebuf[1][0x20 + (start << 4)];
for(column = start; column < end; column++)
{
atbuf = nt[column];
DRAW_COLUMN(atbuf, v_line)
}
}
}
void render_bg_m5_vs(int line, int width)
{
int column;
uint32 atex, atbuf, *src, *dst;
uint32 v_line, *nt;
/* Common data */
uint32 xscroll = *(uint32 *)&vram[hscb + ((line & hscroll_mask) << 2)];
uint32 yscroll = 0;
uint32 pf_col_mask = playfield_col_mask;
uint32 pf_row_mask = playfield_row_mask;
uint32 pf_shift = playfield_shift;
uint32 *vs = (uint32 *)&vsram[0];
/* Window & Plane A */
int a = (reg[18] & 0x1F) << 3;
int w = (reg[18] >> 7) & 1;
/* Plane B width */
int start = 0;
int end = width >> 4;
/* Plane B horizontal scroll */
#ifdef LSB_FIRST
uint32 shift = (xscroll >> 16) & 0x0F;
uint32 index = pf_col_mask + 1 - ((xscroll >> 20) & pf_col_mask);
#else
uint32 shift = (xscroll & 0x0F);
uint32 index = pf_col_mask + 1 - ((xscroll >> 4) & pf_col_mask);
#endif
/* Left-most column vertical scrolling when partially shown horizontally (verified on PAL MD2) */
/* TODO: check on Genesis 3 models since it apparently behaves differently */
/* In H32 mode, vertical scrolling is disabled, in H40 mode, same value is used for both planes */
/* See Formula One / Kawasaki Superbike Challenge (H32) & Gynoug / Cutie Suzuki no Ringside Angel (H40) */
if (reg[12] & 1)
{
yscroll = vs[19] & (vs[19] >> 16);
}
if(shift)
{
/* Plane B vertical scroll */
v_line = (line + yscroll) & pf_row_mask;
/* Plane B name table */
nt = (uint32 *)&vram[ntbb + (((v_line >> 3) << pf_shift) & 0x1FC0)];
/* Pattern row index */
v_line = (v_line & 7) << 3;
/* Plane B line buffer */
dst = (uint32 *)&linebuf[0][0x10 + shift];
atbuf = nt[(index - 1) & pf_col_mask];
DRAW_COLUMN(atbuf, v_line)
}
else
{
/* Plane B line buffer */
dst = (uint32 *)&linebuf[0][0x20];
}
for(column = 0; column < end; column++, index++)
{
/* Plane B vertical scroll */
#ifdef LSB_FIRST
v_line = (line + (vs[column] >> 16)) & pf_row_mask;
#else
v_line = (line + vs[column]) & pf_row_mask;
#endif
/* Plane B name table */
nt = (uint32 *)&vram[ntbb + (((v_line >> 3) << pf_shift) & 0x1FC0)];
/* Pattern row index */
v_line = (v_line & 7) << 3;
atbuf = nt[index & pf_col_mask];
DRAW_COLUMN(atbuf, v_line)
}
if (w == (line >= a))
{
/* Window takes up entire line */
a = 0;
w = 1;
}
else
{
/* Window and Plane A share the line */
a = clip[0].enable;
w = clip[1].enable;
}
/* Plane A */
if (a)
{
/* Plane A width */
start = clip[0].left;
end = clip[0].right;
/* Plane A horizontal scroll */
#ifdef LSB_FIRST
shift = (xscroll & 0x0F);
index = pf_col_mask + start + 1 - ((xscroll >> 4) & pf_col_mask);
#else
shift = (xscroll >> 16) & 0x0F;
index = pf_col_mask + start + 1 - ((xscroll >> 20) & pf_col_mask);
#endif
if(shift)
{
/* Plane A vertical scroll */
v_line = (line + yscroll) & pf_row_mask;
/* Plane A name table */
nt = (uint32 *)&vram[ntab + (((v_line >> 3) << pf_shift) & 0x1FC0)];
/* Pattern row index */
v_line = (v_line & 7) << 3;
/* Plane A line buffer */
dst = (uint32 *)&linebuf[1][0x10 + shift + (start << 4)];
/* Window bug */
if (start)
{
atbuf = nt[index & pf_col_mask];
}
else
{
atbuf = nt[(index - 1) & pf_col_mask];
}
DRAW_COLUMN(atbuf, v_line)
}
else
{
/* Plane A line buffer */
dst = (uint32 *)&linebuf[1][0x20 + (start << 4)];
}
for(column = start; column < end; column++, index++)
{
/* Plane A vertical scroll */
#ifdef LSB_FIRST
v_line = (line + vs[column]) & pf_row_mask;
#else
v_line = (line + (vs[column] >> 16)) & pf_row_mask;
#endif
/* Plane A name table */
nt = (uint32 *)&vram[ntab + (((v_line >> 3) << pf_shift) & 0x1FC0)];
/* Pattern row index */
v_line = (v_line & 7) << 3;
atbuf = nt[index & pf_col_mask];
DRAW_COLUMN(atbuf, v_line)
}
/* Window width */
start = clip[1].left;
end = clip[1].right;
}
/* Window */
if (w)
{
/* Window name table */
nt = (uint32 *)&vram[ntwb | ((line >> 3) << (6 + (reg[12] & 1)))];
/* Pattern row index */
v_line = (line & 7) << 3;
/* Plane A line buffer */
dst = (uint32 *)&linebuf[1][0x20 + (start << 4)];
for(column = start; column < end; column++)
{
atbuf = nt[column];
DRAW_COLUMN(atbuf, v_line)
}
}
}
void render_bg_m5_im2(int line, int width)
{
int column;
uint32 atex, atbuf, *src, *dst;
/* Common data */
int odd = odd_frame;
uint32 xscroll = *(uint32 *)&vram[hscb + ((line & hscroll_mask) << 2)];
uint32 yscroll = *(uint32 *)&vsram[0];
uint32 pf_col_mask = playfield_col_mask;
uint32 pf_row_mask = playfield_row_mask;
uint32 pf_shift = playfield_shift;
/* Window & Plane A */
int a = (reg[18] & 0x1F) << 3;
int w = (reg[18] >> 7) & 1;
/* Plane B width */
int start = 0;
int end = width >> 4;
/* Plane B scroll */
#ifdef LSB_FIRST
uint32 shift = (xscroll >> 16) & 0x0F;
uint32 index = pf_col_mask + 1 - ((xscroll >> 20) & pf_col_mask);
uint32 v_line = (line + (yscroll >> 17)) & pf_row_mask;
#else
uint32 shift = (xscroll & 0x0F);
uint32 index = pf_col_mask + 1 - ((xscroll >> 4) & pf_col_mask);
uint32 v_line = (line + (yscroll >> 1)) & pf_row_mask;
#endif
/* Plane B name table */
uint32 *nt = (uint32 *)&vram[ntbb + (((v_line >> 3) << pf_shift) & 0x1FC0)];
/* Pattern row index */
v_line = (((v_line & 7) << 1) | odd) << 3;
if(shift)
{
/* Plane B line buffer */
dst = (uint32 *)&linebuf[0][0x10 + shift];
atbuf = nt[(index - 1) & pf_col_mask];
DRAW_COLUMN_IM2(atbuf, v_line)
}
else
{
/* Plane B line buffer */
dst = (uint32 *)&linebuf[0][0x20];
}
for(column = 0; column < end; column++, index++)
{
atbuf = nt[index & pf_col_mask];
DRAW_COLUMN_IM2(atbuf, v_line)
}
if (w == (line >= a))
{
/* Window takes up entire line */
a = 0;
w = 1;
}
else
{
/* Window and Plane A share the line */
a = clip[0].enable;
w = clip[1].enable;
}
/* Plane A */
if (a)
{
/* Plane A width */
start = clip[0].left;
end = clip[0].right;
/* Plane A scroll */
#ifdef LSB_FIRST
shift = (xscroll & 0x0F);
index = pf_col_mask + start + 1 - ((xscroll >> 4) & pf_col_mask);
v_line = (line + (yscroll >> 1)) & pf_row_mask;
#else
shift = (xscroll >> 16) & 0x0F;
index = pf_col_mask + start + 1 - ((xscroll >> 20) & pf_col_mask);
v_line = (line + (yscroll >> 17)) & pf_row_mask;
#endif
/* Plane A name table */
nt = (uint32 *)&vram[ntab + (((v_line >> 3) << pf_shift) & 0x1FC0)];
/* Pattern row index */
v_line = (((v_line & 7) << 1) | odd) << 3;
if(shift)
{
/* Plane A line buffer */
dst = (uint32 *)&linebuf[1][0x10 + shift + (start << 4)];
/* Window bug */
if (start)
{
atbuf = nt[index & pf_col_mask];
}
else
{
atbuf = nt[(index - 1) & pf_col_mask];
}
DRAW_COLUMN_IM2(atbuf, v_line)
}
else
{
/* Plane A line buffer */
dst = (uint32 *)&linebuf[1][0x20 + (start << 4)];
}
for(column = start; column < end; column++, index++)
{
atbuf = nt[index & pf_col_mask];
DRAW_COLUMN_IM2(atbuf, v_line)
}
/* Window width */
start = clip[1].left;
end = clip[1].right;
}
/* Window */
if (w)
{
/* Window name table */
nt = (uint32 *)&vram[ntwb | ((line >> 3) << (6 + (reg[12] & 1)))];
/* Pattern row index */
v_line = ((line & 7) << 1 | odd) << 3;
/* Plane A line buffer */
dst = (uint32 *)&linebuf[1][0x20 + (start << 4)];
for(column = start; column < end; column++)
{
atbuf = nt[column];
DRAW_COLUMN_IM2(atbuf, v_line)
}
}
}
void render_bg_m5_im2_vs(int line, int width)
{
int column;
uint32 atex, atbuf, *src, *dst;
uint32 v_line, *nt;
/* Common data */
int odd = odd_frame;
uint32 xscroll = *(uint32 *)&vram[hscb + ((line & hscroll_mask) << 2)];
uint32 yscroll = 0;
uint32 pf_col_mask = playfield_col_mask;
uint32 pf_row_mask = playfield_row_mask;
uint32 pf_shift = playfield_shift;
uint32 *vs = (uint32 *)&vsram[0];
/* Window & Plane A */
int a = (reg[18] & 0x1F) << 3;
int w = (reg[18] >> 7) & 1;
/* Plane B width */
int start = 0;
int end = width >> 4;
/* Plane B horizontal scroll */
#ifdef LSB_FIRST
uint32 shift = (xscroll >> 16) & 0x0F;
uint32 index = pf_col_mask + 1 - ((xscroll >> 20) & pf_col_mask);
#else
uint32 shift = (xscroll & 0x0F);
uint32 index = pf_col_mask + 1 - ((xscroll >> 4) & pf_col_mask);
#endif
/* Left-most column vertical scrolling when partially shown horizontally (verified on PAL MD2) */
/* TODO: check on Genesis 3 models since it apparently behaves differently */
/* In H32 mode, vertical scrolling is disabled, in H40 mode, same value is used for both planes */
/* See Formula One / Kawasaki Superbike Challenge (H32) & Gynoug / Cutie Suzuki no Ringside Angel (H40) */
if (reg[12] & 1)
{
yscroll = (vs[19] >> 1) & (vs[19] >> 17);
}
if(shift)
{
/* Plane B vertical scroll */
v_line = (line + yscroll) & pf_row_mask;
/* Plane B name table */
nt = (uint32 *)&vram[ntbb + (((v_line >> 3) << pf_shift) & 0x1FC0)];
/* Pattern row index */
v_line = (((v_line & 7) << 1) | odd) << 3;
/* Plane B line buffer */
dst = (uint32 *)&linebuf[0][0x10 + shift];
atbuf = nt[(index - 1) & pf_col_mask];
DRAW_COLUMN_IM2(atbuf, v_line)
}
else
{
/* Plane B line buffer */
dst = (uint32 *)&linebuf[0][0x20];
}
for(column = 0; column < end; column++, index++)
{
/* Plane B vertical scroll */
#ifdef LSB_FIRST
v_line = (line + (vs[column] >> 17)) & pf_row_mask;
#else
v_line = (line + (vs[column] >> 1)) & pf_row_mask;
#endif
/* Plane B name table */
nt = (uint32 *)&vram[ntbb + (((v_line >> 3) << pf_shift) & 0x1FC0)];
/* Pattern row index */
v_line = (((v_line & 7) << 1) | odd) << 3;
atbuf = nt[index & pf_col_mask];
DRAW_COLUMN_IM2(atbuf, v_line)
}
if (w == (line >= a))
{
/* Window takes up entire line */
a = 0;
w = 1;
}
else
{
/* Window and Plane A share the line */
a = clip[0].enable;
w = clip[1].enable;
}
/* Plane A */
if (a)
{
/* Plane A width */
start = clip[0].left;
end = clip[0].right;
/* Plane A horizontal scroll */
#ifdef LSB_FIRST
shift = (xscroll & 0x0F);
index = pf_col_mask + start + 1 - ((xscroll >> 4) & pf_col_mask);
#else
shift = (xscroll >> 16) & 0x0F;
index = pf_col_mask + start + 1 - ((xscroll >> 20) & pf_col_mask);
#endif
if(shift)
{
/* Plane A vertical scroll */
v_line = (line + yscroll) & pf_row_mask;
/* Plane A name table */
nt = (uint32 *)&vram[ntab + (((v_line >> 3) << pf_shift) & 0x1FC0)];
/* Pattern row index */
v_line = (((v_line & 7) << 1) | odd) << 3;
/* Plane A line buffer */
dst = (uint32 *)&linebuf[1][0x10 + shift + (start << 4)];
/* Window bug */
if (start)
{
atbuf = nt[index & pf_col_mask];
}
else
{
atbuf = nt[(index - 1) & pf_col_mask];
}
DRAW_COLUMN_IM2(atbuf, v_line)
}
else
{
/* Plane A line buffer */
dst = (uint32 *)&linebuf[1][0x20 + (start << 4)];
}
for(column = start; column < end; column++, index++)
{
/* Plane A vertical scroll */
#ifdef LSB_FIRST
v_line = (line + (vs[column] >> 1)) & pf_row_mask;
#else
v_line = (line + (vs[column] >> 17)) & pf_row_mask;
#endif
/* Plane A name table */
nt = (uint32 *)&vram[ntab + (((v_line >> 3) << pf_shift) & 0x1FC0)];
/* Pattern row index */
v_line = (((v_line & 7) << 1) | odd) << 3;
atbuf = nt[index & pf_col_mask];
DRAW_COLUMN_IM2(atbuf, v_line)
}
/* Window width */
start = clip[1].left;
end = clip[1].right;
}
/* Window */
if (w)
{
/* Window name table */
nt = (uint32 *)&vram[ntwb | ((line >> 3) << (6 + (reg[12] & 1)))];
/* Pattern row index */
v_line = ((line & 7) << 1 | odd) << 3;
/* Plane A line buffer */
dst = (uint32 *)&linebuf[1][0x20 + (start << 4)];
for(column = start; column < end; column++)
{
atbuf = nt[column];
DRAW_COLUMN_IM2(atbuf, v_line)
}
}
}
#else
void render_bg_m5(int line, int width)
{
int column, start, end;
uint32 atex, atbuf, *src, *dst;
uint32 shift, index, v_line, *nt;
uint8 *lb;
/* Scroll Planes common data */
uint32 xscroll = *(uint32 *)&vram[hscb + ((line & hscroll_mask) << 2)];
uint32 yscroll = *(uint32 *)&vsram[0];
uint32 pf_col_mask = playfield_col_mask;
uint32 pf_row_mask = playfield_row_mask;
uint32 pf_shift = playfield_shift;
/* Layer priority table */
uint8 *table = lut[(reg[12] & 8) >> 2];
/* Window vertical range (cell 0-31) */
int a = (reg[18] & 0x1F) << 3;
/* Window position (0=top, 1=bottom) */
int w = (reg[18] >> 7) & 1;
/* Test against current line */
if (w == (line >= a))
{
/* Window takes up entire line */
a = 0;
w = 1;
}
else
{
/* Window and Plane A share the line */
a = clip[0].enable;
w = clip[1].enable;
}
/* Number of columns to draw */
width >>= 4;
/* Plane A */
if (a)
{
/* Plane A width */
start = clip[0].left;
end = clip[0].right;
/* Plane A scroll */
#ifdef LSB_FIRST
shift = (xscroll & 0x0F);
index = pf_col_mask + start + 1 - ((xscroll >> 4) & pf_col_mask);
v_line = (line + yscroll) & pf_row_mask;
#else
shift = (xscroll >> 16) & 0x0F;
index = pf_col_mask + start + 1 - ((xscroll >> 20) & pf_col_mask);
v_line = (line + (yscroll >> 16)) & pf_row_mask;
#endif
/* Background line buffer */
dst = (uint32 *)&linebuf[0][0x20 + (start << 4) + shift];
/* Plane A name table */
nt = (uint32 *)&vram[ntab + (((v_line >> 3) << pf_shift) & 0x1FC0)];
/* Pattern row index */
v_line = (v_line & 7) << 3;
if(shift)
{
/* Left-most column is partially shown */
dst -= 4;
/* Window bug */
if (start)
{
atbuf = nt[index & pf_col_mask];
}
else
{
atbuf = nt[(index-1) & pf_col_mask];
}
DRAW_COLUMN(atbuf, v_line)
}
for(column = start; column < end; column++, index++)
{
atbuf = nt[index & pf_col_mask];
DRAW_COLUMN(atbuf, v_line)
}
/* Window width */
start = clip[1].left;
end = clip[1].right;
}
else
{
/* Window width */
start = 0;
end = width;
}
/* Window Plane */
if (w)
{
/* Background line buffer */
dst = (uint32 *)&linebuf[0][0x20 + (start << 4)];
/* Window name table */
nt = (uint32 *)&vram[ntwb | ((line >> 3) << (6 + (reg[12] & 1)))];
/* Pattern row index */
v_line = (line & 7) << 3;
for(column = start; column < end; column++)
{
atbuf = nt[column];
DRAW_COLUMN(atbuf, v_line)
}
}
/* Plane B scroll */
#ifdef LSB_FIRST
shift = (xscroll >> 16) & 0x0F;
index = pf_col_mask + 1 - ((xscroll >> 20) & pf_col_mask);
v_line = (line + (yscroll >> 16)) & pf_row_mask;
#else
shift = (xscroll & 0x0F);
index = pf_col_mask + 1 - ((xscroll >> 4) & pf_col_mask);
v_line = (line + yscroll) & pf_row_mask;
#endif
/* Plane B name table */
nt = (uint32 *)&vram[ntbb + (((v_line >> 3) << pf_shift) & 0x1FC0)];
/* Pattern row index */
v_line = (v_line & 7) << 3;
/* Background line buffer */
lb = &linebuf[0][0x20];
if(shift)
{
/* Left-most column is partially shown */
lb -= (0x10 - shift);
atbuf = nt[(index-1) & pf_col_mask];
DRAW_BG_COLUMN(atbuf, v_line, xscroll, yscroll)
}
for(column = 0; column < width; column++, index++)
{
atbuf = nt[index & pf_col_mask];
DRAW_BG_COLUMN(atbuf, v_line, xscroll, yscroll)
}
}
void render_bg_m5_vs(int line, int width)
{
int column, start, end;
uint32 atex, atbuf, *src, *dst;
uint32 shift, index, v_line, *nt;
uint8 *lb;
/* Scroll Planes common data */
uint32 xscroll = *(uint32 *)&vram[hscb + ((line & hscroll_mask) << 2)];
uint32 yscroll = 0;
uint32 pf_col_mask = playfield_col_mask;
uint32 pf_row_mask = playfield_row_mask;
uint32 pf_shift = playfield_shift;
uint32 *vs = (uint32 *)&vsram[0];
/* Layer priority table */
uint8 *table = lut[(reg[12] & 8) >> 2];
/* Window vertical range (cell 0-31) */
int a = (reg[18] & 0x1F) << 3;
/* Window position (0=top, 1=bottom) */
int w = (reg[18] >> 7) & 1;
/* Test against current line */
if (w == (line >= a))
{
/* Window takes up entire line */
a = 0;
w = 1;
}
else
{
/* Window and Plane A share the line */
a = clip[0].enable;
w = clip[1].enable;
}
/* Left-most column vertical scrolling when partially shown horizontally */
/* Same value for both planes, only in 40-cell mode, verified on PAL MD2 */
/* See Gynoug, Cutie Suzuki no Ringside Angel, Formula One, Kawasaki Superbike Challenge */
if (reg[12] & 1)
{
yscroll = vs[19] & (vs[19] >> 16);
}
/* Number of columns to draw */
width >>= 4;
/* Plane A*/
if (a)
{
/* Plane A width */
start = clip[0].left;
end = clip[0].right;
/* Plane A horizontal scroll */
#ifdef LSB_FIRST
shift = (xscroll & 0x0F);
index = pf_col_mask + start + 1 - ((xscroll >> 4) & pf_col_mask);
#else
shift = (xscroll >> 16) & 0x0F;
index = pf_col_mask + start + 1 - ((xscroll >> 20) & pf_col_mask);
#endif
/* Background line buffer */
dst = (uint32 *)&linebuf[0][0x20 + (start << 4) + shift];
if(shift)
{
/* Left-most column is partially shown */
dst -= 4;
/* Plane A vertical scroll */
v_line = (line + yscroll) & pf_row_mask;
/* Plane A name table */
nt = (uint32 *)&vram[ntab + (((v_line >> 3) << pf_shift) & 0x1FC0)];
/* Pattern row index */
v_line = (v_line & 7) << 3;
/* Window bug */
if (start)
{
atbuf = nt[index & pf_col_mask];
}
else
{
atbuf = nt[(index-1) & pf_col_mask];
}
DRAW_COLUMN(atbuf, v_line)
}
for(column = start; column < end; column++, index++)
{
/* Plane A vertical scroll */
#ifdef LSB_FIRST
v_line = (line + vs[column]) & pf_row_mask;
#else
v_line = (line + (vs[column] >> 16)) & pf_row_mask;
#endif
/* Plane A name table */
nt = (uint32 *)&vram[ntab + (((v_line >> 3) << pf_shift) & 0x1FC0)];
/* Pattern row index */
v_line = (v_line & 7) << 3;
atbuf = nt[index & pf_col_mask];
DRAW_COLUMN(atbuf, v_line)
}
/* Window width */
start = clip[1].left;
end = clip[1].right;
}
else
{
/* Window width */
start = 0;
end = width;
}
/* Window Plane */
if (w)
{
/* Background line buffer */
dst = (uint32 *)&linebuf[0][0x20 + (start << 4)];
/* Window name table */
nt = (uint32 *)&vram[ntwb | ((line >> 3) << (6 + (reg[12] & 1)))];
/* Pattern row index */
v_line = (line & 7) << 3;
for(column = start; column < end; column++)
{
atbuf = nt[column];
DRAW_COLUMN(atbuf, v_line)
}
}
/* Plane B horizontal scroll */
#ifdef LSB_FIRST
shift = (xscroll >> 16) & 0x0F;
index = pf_col_mask + 1 - ((xscroll >> 20) & pf_col_mask);
#else
shift = (xscroll & 0x0F);
index = pf_col_mask + 1 - ((xscroll >> 4) & pf_col_mask);
#endif
/* Background line buffer */
lb = &linebuf[0][0x20];
if(shift)
{
/* Left-most column is partially shown */
lb -= (0x10 - shift);
/* Plane B vertical scroll */
v_line = (line + yscroll) & pf_row_mask;
/* Plane B name table */
nt = (uint32 *)&vram[ntbb + (((v_line >> 3) << pf_shift) & 0x1FC0)];
/* Pattern row index */
v_line = (v_line & 7) << 3;
atbuf = nt[(index-1) & pf_col_mask];
DRAW_BG_COLUMN(atbuf, v_line, xscroll, yscroll)
}
for(column = 0; column < width; column++, index++)
{
/* Plane B vertical scroll */
#ifdef LSB_FIRST
v_line = (line + (vs[column] >> 16)) & pf_row_mask;
#else
v_line = (line + vs[column]) & pf_row_mask;
#endif
/* Plane B name table */
nt = (uint32 *)&vram[ntbb + (((v_line >> 3) << pf_shift) & 0x1FC0)];
/* Pattern row index */
v_line = (v_line & 7) << 3;
atbuf = nt[index & pf_col_mask];
DRAW_BG_COLUMN(atbuf, v_line, xscroll, yscroll)
}
}
void render_bg_m5_im2(int line, int width)
{
int column, start, end;
uint32 atex, atbuf, *src, *dst;
uint32 shift, index, v_line, *nt;
uint8 *lb;
/* Scroll Planes common data */
int odd = odd_frame;
uint32 xscroll = *(uint32 *)&vram[hscb + ((line & hscroll_mask) << 2)];
uint32 yscroll = *(uint32 *)&vsram[0];
uint32 pf_col_mask = playfield_col_mask;
uint32 pf_row_mask = playfield_row_mask;
uint32 pf_shift = playfield_shift;
/* Layer priority table */
uint8 *table = lut[(reg[12] & 8) >> 2];
/* Window vertical range (cell 0-31) */
int a = (reg[18] & 0x1F) << 3;
/* Window position (0=top, 1=bottom) */
int w = (reg[18] >> 7) & 1;
/* Test against current line */
if (w == (line >= a))
{
/* Window takes up entire line */
a = 0;
w = 1;
}
else
{
/* Window and Plane A share the line */
a = clip[0].enable;
w = clip[1].enable;
}
/* Number of columns to draw */
width >>= 4;
/* Plane A */
if (a)
{
/* Plane A width */
start = clip[0].left;
end = clip[0].right;
/* Plane A scroll */
#ifdef LSB_FIRST
shift = (xscroll & 0x0F);
index = pf_col_mask + start + 1 - ((xscroll >> 4) & pf_col_mask);
v_line = (line + (yscroll >> 1)) & pf_row_mask;
#else
shift = (xscroll >> 16) & 0x0F;
index = pf_col_mask + start + 1 - ((xscroll >> 20) & pf_col_mask);
v_line = (line + (yscroll >> 17)) & pf_row_mask;
#endif
/* Background line buffer */
dst = (uint32 *)&linebuf[0][0x20 + (start << 4) + shift];
/* Plane A name table */
nt = (uint32 *)&vram[ntab + (((v_line >> 3) << pf_shift) & 0x1FC0)];
/* Pattern row index */
v_line = (((v_line & 7) << 1) | odd) << 3;
if(shift)
{
/* Left-most column is partially shown */
dst -= 4;
/* Window bug */
if (start)
{
atbuf = nt[index & pf_col_mask];
}
else
{
atbuf = nt[(index-1) & pf_col_mask];
}
DRAW_COLUMN_IM2(atbuf, v_line)
}
for(column = start; column < end; column++, index++)
{
atbuf = nt[index & pf_col_mask];
DRAW_COLUMN_IM2(atbuf, v_line)
}
/* Window width */
start = clip[1].left;
end = clip[1].right;
}
else
{
/* Window width */
start = 0;
end = width;
}
/* Window Plane */
if (w)
{
/* Background line buffer */
dst = (uint32 *)&linebuf[0][0x20 + (start << 4)];
/* Window name table */
nt = (uint32 *)&vram[ntwb | ((line >> 3) << (6 + (reg[12] & 1)))];
/* Pattern row index */
v_line = ((line & 7) << 1 | odd) << 3;
for(column = start; column < end; column++)
{
atbuf = nt[column];
DRAW_COLUMN_IM2(atbuf, v_line)
}
}
/* Plane B scroll */
#ifdef LSB_FIRST
shift = (xscroll >> 16) & 0x0F;
index = pf_col_mask + 1 - ((xscroll >> 20) & pf_col_mask);
v_line = (line + (yscroll >> 17)) & pf_row_mask;
#else
shift = (xscroll & 0x0F);
index = pf_col_mask + 1 - ((xscroll >> 4) & pf_col_mask);
v_line = (line + (yscroll >> 1)) & pf_row_mask;
#endif
/* Plane B name table */
nt = (uint32 *)&vram[ntbb + (((v_line >> 3) << pf_shift) & 0x1FC0)];
/* Pattern row index */
v_line = (((v_line & 7) << 1) | odd) << 3;
/* Background line buffer */
lb = &linebuf[0][0x20];
if(shift)
{
/* Left-most column is partially shown */
lb -= (0x10 - shift);
atbuf = nt[(index-1) & pf_col_mask];
DRAW_BG_COLUMN_IM2(atbuf, v_line, xscroll, yscroll)
}
for(column = 0; column < width; column++, index++)
{
atbuf = nt[index & pf_col_mask];
DRAW_BG_COLUMN_IM2(atbuf, v_line, xscroll, yscroll)
}
}
void render_bg_m5_im2_vs(int line, int width)
{
int column, start, end;
uint32 atex, atbuf, *src, *dst;
uint32 shift, index, v_line, *nt;
uint8 *lb;
/* common data */
int odd = odd_frame;
uint32 xscroll = *(uint32 *)&vram[hscb + ((line & hscroll_mask) << 2)];
uint32 yscroll = 0;
uint32 pf_col_mask = playfield_col_mask;
uint32 pf_row_mask = playfield_row_mask;
uint32 pf_shift = playfield_shift;
uint32 *vs = (uint32 *)&vsram[0];
/* Layer priority table */
uint8 *table = lut[(reg[12] & 8) >> 2];
/* Window vertical range (cell 0-31) */
uint32 a = (reg[18] & 0x1F) << 3;
/* Window position (0=top, 1=bottom) */
uint32 w = (reg[18] >> 7) & 1;
/* Test against current line */
if (w == (line >= a))
{
/* Window takes up entire line */
a = 0;
w = 1;
}
else
{
/* Window and Plane A share the line */
a = clip[0].enable;
w = clip[1].enable;
}
/* Left-most column vertical scrolling when partially shown horizontally */
/* Same value for both planes, only in 40-cell mode, verified on PAL MD2 */
/* See Gynoug, Cutie Suzuki no Ringside Angel, Formula One, Kawasaki Superbike Challenge */
if (reg[12] & 1)
{
/* only in 40-cell mode, verified on MD2 */
yscroll = (vs[19] >> 1) & (vs[19] >> 17);
}
/* Number of columns to draw */
width >>= 4;
/* Plane A */
if (a)
{
/* Plane A width */
start = clip[0].left;
end = clip[0].right;
/* Plane A horizontal scroll */
#ifdef LSB_FIRST
shift = (xscroll & 0x0F);
index = pf_col_mask + start + 1 - ((xscroll >> 4) & pf_col_mask);
#else
shift = (xscroll >> 16) & 0x0F;
index = pf_col_mask + start + 1 - ((xscroll >> 20) & pf_col_mask);
#endif
/* Background line buffer */
dst = (uint32 *)&linebuf[0][0x20 + (start << 4) + shift];
if(shift)
{
/* Left-most column is partially shown */
dst -= 4;
/* Plane A vertical scroll */
v_line = (line + yscroll) & pf_row_mask;
/* Plane A name table */
nt = (uint32 *)&vram[ntab + (((v_line >> 3) << pf_shift) & 0x1FC0)];
/* Pattern row index */
v_line = (((v_line & 7) << 1) | odd) << 3;
/* Window bug */
if (start)
{
atbuf = nt[index & pf_col_mask];
}
else
{
atbuf = nt[(index-1) & pf_col_mask];
}
DRAW_COLUMN_IM2(atbuf, v_line)
}
for(column = start; column < end; column++, index++)
{
/* Plane A vertical scroll */
#ifdef LSB_FIRST
v_line = (line + (vs[column] >> 1)) & pf_row_mask;
#else
v_line = (line + (vs[column] >> 17)) & pf_row_mask;
#endif
/* Plane A name table */
nt = (uint32 *)&vram[ntab + (((v_line >> 3) << pf_shift) & 0x1FC0)];
/* Pattern row index */
v_line = (((v_line & 7) << 1) | odd) << 3;
atbuf = nt[index & pf_col_mask];
DRAW_COLUMN_IM2(atbuf, v_line)
}
/* Window width */
start = clip[1].left;
end = clip[1].right;
}
else
{
/* Window width */
start = 0;
end = width;
}
/* Window Plane */
if (w)
{
/* Background line buffer */
dst = (uint32 *)&linebuf[0][0x20 + (start << 4)];
/* Window name table */
nt = (uint32 *)&vram[ntwb | ((line >> 3) << (6 + (reg[12] & 1)))];
/* Pattern row index */
v_line = ((line & 7) << 1 | odd) << 3;
for(column = start; column < end; column++)
{
atbuf = nt[column];
DRAW_COLUMN_IM2(atbuf, v_line)
}
}
/* Plane B horizontal scroll */
#ifdef LSB_FIRST
shift = (xscroll >> 16) & 0x0F;
index = pf_col_mask + 1 - ((xscroll >> 20) & pf_col_mask);
#else
shift = (xscroll & 0x0F);
index = pf_col_mask + 1 - ((xscroll >> 4) & pf_col_mask);
#endif
/* Background line buffer */
lb = &linebuf[0][0x20];
if(shift)
{
/* Left-most column is partially shown */
lb -= (0x10 - shift);
/* Plane B vertical scroll */
v_line = (line + yscroll) & pf_row_mask;
/* Plane B name table */
nt = (uint32 *)&vram[ntbb + (((v_line >> 3) << pf_shift) & 0x1FC0)];
/* Pattern row index */
v_line = (((v_line & 7) << 1) | odd) << 3;
atbuf = nt[(index-1) & pf_col_mask];
DRAW_BG_COLUMN_IM2(atbuf, v_line, xscroll, yscroll)
}
for(column = 0; column < width; column++, index++)
{
/* Plane B vertical scroll */
#ifdef LSB_FIRST
v_line = (line + (vs[column] >> 17)) & pf_row_mask;
#else
v_line = (line + (vs[column] >> 1)) & pf_row_mask;
#endif
/* Plane B name table */
nt = (uint32 *)&vram[ntbb + (((v_line >> 3) << pf_shift) & 0x1FC0)];
/* Pattern row index */
v_line = (((v_line & 7) << 1) | odd) << 3;
atbuf = nt[index & pf_col_mask];
DRAW_BG_COLUMN_IM2(atbuf, v_line, xscroll, yscroll)
}
}
#endif
/*--------------------------------------------------------------------------*/
/* Sprite layer rendering functions */
/*--------------------------------------------------------------------------*/
void render_obj_tms(int max_width)
{
int x, count, start, end;
uint8 *lb, *sg;
uint8 color, pattern[2];
uint16 temp;
/* Default sprite width (8 pixels) */
int width = 8;
/* Adjust width for 16x16 sprites */
width <<= ((reg[1] & 0x02) >> 1);
/* Adjust width for zoomed sprites */
width <<= (reg[1] & 0x01);
/* Set SOVR flag */
status |= spr_ovr;
spr_ovr = 0;
/* Draw sprites in front-to-back order */
for (count = 0; count < object_count; count++)
{
/* Sprite X position */
start = object_info[count].xpos;
/* Sprite Color + Early Clock bit */
color = object_info[count].size;
/* X position shift (32 pixels) */
start -= ((color & 0x80) >> 2);
/* Pointer to line buffer */
lb = &linebuf[0][0x20 + start];
if ((start + width) > 256)
{
/* Clip sprites on right edge */
end = 256 - start;
start = 0;
}
else
{
end = width;
if (start < 0)
{
/* Clip sprites on left edge */
start = 0 - start;
}
else
{
start = 0;
}
}
/* Sprite Color (0-15) */
color &= 0x0F;
/* Sprite Pattern Name */
temp = object_info[count].attr;
/* Mask two LSB for 16x16 sprites */
temp &= ~((reg[1] & 0x02) >> 0);
temp &= ~((reg[1] & 0x02) >> 1);
/* Pointer to sprite generator table */
sg = (uint8 *)&vram[((reg[6] << 11) & 0x3800) | (temp << 3) | object_info[count].ypos];
/* Sprite Pattern data (2 x 8 pixels) */
pattern[0] = sg[0x00];
pattern[1] = sg[0x10];
if (reg[1] & 0x01)
{
/* Zoomed sprites are rendered at half speed */
for (x=start; x<end; x+=2)
{
temp = pattern[(x >> 4) & 1];
temp = (temp >> (7 - ((x >> 1) & 7))) & 0x01;
temp = temp * color;
temp |= (lb[x] << 8);
lb[x] = lut[5][temp];
status |= ((temp & 0x8000) >> 10);
temp &= 0x00FF;
temp |= (lb[x+1] << 8);
lb[x+1] = lut[5][temp];
status |= ((temp & 0x8000) >> 10);
}
}
else
{
/* Normal sprites */
for (x=start; x<end; x++)
{
temp = pattern[(x >> 3) & 1];
temp = (temp >> (7 - (x & 7))) & 0x01;
temp = temp * color;
temp |= (lb[x] << 8);
lb[x] = lut[5][temp];
status |= ((temp & 0x8000) >> 10);
}
}
}
/* handle Game Gear reduced screen (160x144) */
if ((system_hw == SYSTEM_GG) && !config.gg_extra && (v_counter < bitmap.viewport.h))
{
int line = v_counter - (bitmap.viewport.h - 144) / 2;
if ((line < 0) || (line >= 144))
{
memset(&linebuf[0][0x20], 0x40, max_width);
}
else
{
if (bitmap.viewport.x > 0)
{
memset(&linebuf[0][0x20], 0x40, 48);
memset(&linebuf[0][0x20+48+160], 0x40, 48);
}
}
}
}
void render_obj_m4(int max_width)
{
int i, count, xpos, end;
uint8 *src, *lb;
uint16 temp;
/* Default sprite width */
int width = 8;
/* Sprite Generator address mask (LSB is masked for 8x16 sprites) */
uint16 sg_mask = (~0x1C0 ^ (reg[6] << 6)) & (~((reg[1] & 0x02) >> 1));
/* Zoomed sprites (not working on Genesis VDP) */
if (system_hw < SYSTEM_MD)
{
width <<= (reg[1] & 0x01);
}
/* Unused bits used as a mask on 315-5124 VDP only */
if (system_hw > SYSTEM_SMS)
{
sg_mask |= 0xC0;
}
/* Set SOVR flag */
status |= spr_ovr;
spr_ovr = 0;
/* Draw sprites in front-to-back order */
for (count = 0; count < object_count; count++)
{
/* 315-5124 VDP specific */
if (count == 4)
{
if (system_hw < SYSTEM_SMS2)
{
/* Only 4 first sprites can be zoomed */
width = 8;
}
}
/* Sprite pattern index */
temp = (object_info[count].attr | 0x100) & sg_mask;
/* Pointer to pattern cache line */
src = (uint8 *)&bg_pattern_cache[(temp << 6) | (object_info[count].ypos << 3)];
/* Sprite X position */
xpos = object_info[count].xpos;
/* X position shift */
xpos -= (reg[0] & 0x08);
if (xpos < 0)
{
/* Clip sprites on left edge */
src = src - xpos;
end = xpos + width;
xpos = 0;
}
else if ((xpos + width) > max_width)
{
/* Clip sprites on right edge */
end = max_width - xpos;
}
else
{
/* Sprite maximal width */
end = width;
}
/* Pointer to line buffer */
lb = &linebuf[0][0x20 + xpos];
if (width > 8)
{
/* Draw sprite pattern (zoomed sprites are rendered at half speed) */
DRAW_SPRITE_TILE_ACCURATE_2X(end,0,lut[5])
}
else
{
/* Draw sprite pattern */
DRAW_SPRITE_TILE_ACCURATE(end,0,lut[5])
}
}
/* handle Game Gear reduced screen (160x144) */
if ((system_hw == SYSTEM_GG) && !config.gg_extra && (v_counter < bitmap.viewport.h))
{
int line = v_counter - (bitmap.viewport.h - 144) / 2;
if ((line < 0) || (line >= 144))
{
memset(&linebuf[0][0x20], 0x40, max_width);
}
else
{
if (bitmap.viewport.x > 0)
{
memset(&linebuf[0][0x20], 0x40, 48);
memset(&linebuf[0][0x20+48+160], 0x40, 48);
}
}
}
}
void render_obj_m5(int max_width)
{
int i, count, column;
int xpos, width;
int pixelcount = 0;
int masked = 0;
uint8 *src, *s, *lb;
uint32 temp, v_line;
uint32 attr, name, atex;
#ifndef ALT_RENDERER
/* Merge background layers */
merge(&linebuf[1][0x20], &linebuf[0][0x20], &linebuf[0][0x20], lut[0], max_width);
#endif
/* Draw sprites in front-to-back order */
for (count = 0; count < object_count; count++)
{
/* Sprite X position */
xpos = object_info[count].xpos;
/* Sprite masking */
if (xpos)
{
/* Requires at least one sprite with xpos > 0 */
spr_ovr = 1;
}
else if (spr_ovr)
{
/* Remaining sprites are not drawn */
masked = 1;
}
/* Display area offset */
xpos = xpos - 0x80;
/* Sprite size */
temp = object_info[count].size;
/* Sprite width */
width = 8 + ((temp & 0x0C) << 1);
/* Update pixel count (off-screen sprites are included) */
pixelcount += width;
/* Is sprite across visible area ? */
if (((xpos + width) > 0) && (xpos < max_width) && !masked)
{
/* Sprite attributes */
attr = object_info[count].attr;
/* Sprite vertical offset */
v_line = object_info[count].ypos;
/* Sprite priority + palette bits */
atex = (attr >> 9) & 0x70;
/* Pattern name base */
name = attr & 0x07FF;
/* Mask vflip/hflip */
attr &= 0x1800;
/* Pointer into pattern name offset look-up table */
s = &name_lut[((attr >> 3) & 0x300) | (temp << 4) | ((v_line & 0x18) >> 1)];
/* Pointer into line buffer */
lb = &linebuf[0][0x20 + xpos];
/* Adjust number of pixels to draw for sprite limit */
if (pixelcount > max_width)
{
width = width - pixelcount + max_width;
}
/* Number of tiles to draw */
width = width >> 3;
/* Pattern row index */
v_line = (v_line & 7) << 3;
/* Draw sprite patterns */
for(column = 0; column < width; column++, lb+=8)
{
temp = attr | ((name + s[column]) & 0x07FF);
src = &bg_pattern_cache[(temp << 6) | (v_line)];
DRAW_SPRITE_TILE(8,atex,lut[1])
}
}
/* Sprite limit */
if (pixelcount >= max_width)
{
/* Sprite masking will be effective on next line */
spr_ovr = 1;
/* Stop sprite rendering */
return;
}
}
/* Clear sprite masking for next line */
spr_ovr = 0;
}
void render_obj_m5_ste(int max_width)
{
int i, count, column;
int xpos, width;
int pixelcount = 0;
int masked = 0;
uint8 *src, *s, *lb;
uint32 temp, v_line;
uint32 attr, name, atex;
#ifndef ALT_RENDERER
/* Merge background layers */
merge(&linebuf[1][0x20], &linebuf[0][0x20], &linebuf[0][0x20], lut[2], max_width);
#endif
/* Clear sprite line buffer */
memset(&linebuf[1][0], 0, max_width + 0x40);
/* Draw sprites in front-to-back order */
for (count = 0; count < object_count; count++)
{
/* Sprite X position */
xpos = object_info[count].xpos;
/* Sprite masking */
if (xpos)
{
/* Requires at least one sprite with xpos > 0 */
spr_ovr = 1;
}
else if (spr_ovr)
{
/* Remaining sprites are not drawn */
masked = 1;
}
/* Display area offset */
xpos = xpos - 0x80;
/* Sprite size */
temp = object_info[count].size;
/* Sprite width */
width = 8 + ((temp & 0x0C) << 1);
/* Update pixel count (off-screen sprites are included) */
pixelcount += width;
/* Is sprite across visible area ? */
if (((xpos + width) > 0) && (xpos < max_width) && !masked)
{
/* Sprite attributes */
attr = object_info[count].attr;
/* Sprite vertical offset */
v_line = object_info[count].ypos;
/* Sprite priority + palette bits */
atex = (attr >> 9) & 0x70;
/* Pattern name base */
name = attr & 0x07FF;
/* Mask vflip/hflip */
attr &= 0x1800;
/* Pointer into pattern name offset look-up table */
s = &name_lut[((attr >> 3) & 0x300) | (temp << 4) | ((v_line & 0x18) >> 1)];
/* Pointer into line buffer */
lb = &linebuf[1][0x20 + xpos];
/* Adjust number of pixels to draw for sprite limit */
if (pixelcount > max_width)
{
width = width - pixelcount + max_width;
}
/* Number of tiles to draw */
width = width >> 3;
/* Pattern row index */
v_line = (v_line & 7) << 3;
/* Draw sprite patterns */
for(column = 0; column < width; column++, lb+=8)
{
temp = attr | ((name + s[column]) & 0x07FF);
src = &bg_pattern_cache[(temp << 6) | (v_line)];
DRAW_SPRITE_TILE(8,atex,lut[3])
}
}
/* Sprite limit */
if (pixelcount >= max_width)
{
/* Sprite masking will be effective on next line */
spr_ovr = 1;
/* Merge background & sprite layers */
merge(&linebuf[1][0x20],&linebuf[0][0x20],&linebuf[0][0x20],lut[4], max_width);
/* Stop sprite rendering */
return;
}
}
/* Clear sprite masking for next line */
spr_ovr = 0;
/* Merge background & sprite layers */
merge(&linebuf[1][0x20],&linebuf[0][0x20],&linebuf[0][0x20],lut[4], max_width);
}
void render_obj_m5_im2(int max_width)
{
int i, count, column;
int xpos, width;
int pixelcount = 0;
int masked = 0;
int odd = odd_frame;
uint8 *src, *s, *lb;
uint32 temp, v_line;
uint32 attr, name, atex;
#ifndef ALT_RENDERER
/* Merge background layers */
merge(&linebuf[1][0x20], &linebuf[0][0x20], &linebuf[0][0x20], lut[0], max_width);
#endif
/* Draw sprites in front-to-back order */
for (count = 0; count < object_count; count++)
{
/* Sprite X position */
xpos = object_info[count].xpos;
/* Sprite masking */
if (xpos)
{
/* Requires at least one sprite with xpos > 0 */
spr_ovr = 1;
}
else if (spr_ovr)
{
/* Remaining sprites are not drawn */
masked = 1;
}
/* Display area offset */
xpos = xpos - 0x80;
/* Sprite size */
temp = object_info[count].size;
/* Sprite width */
width = 8 + ((temp & 0x0C) << 1);
/* Update pixel count (off-screen sprites are included) */
pixelcount += width;
/* Is sprite across visible area ? */
if (((xpos + width) > 0) && (xpos < max_width) && !masked)
{
/* Sprite attributes */
attr = object_info[count].attr;
/* Sprite y offset */
v_line = object_info[count].ypos;
/* Sprite priority + palette bits */
atex = (attr >> 9) & 0x70;
/* Pattern name base */
name = attr & 0x03FF;
/* Mask vflip/hflip */
attr &= 0x1800;
/* Pattern name offset lookup table */
s = &name_lut[((attr >> 3) & 0x300) | (temp << 4) | ((v_line & 0x18) >> 1)];
/* Pointer into line buffer */
lb = &linebuf[0][0x20 + xpos];
/* Adjust width for sprite limit */
if (pixelcount > max_width)
{
width = width - pixelcount + max_width;
}
/* Number of tiles to draw */
width = width >> 3;
/* Pattern row index */
v_line = (((v_line & 7) << 1) | odd) << 3;
/* Render sprite patterns */
for(column = 0; column < width; column ++, lb+=8)
{
temp = attr | (((name + s[column]) & 0x3ff) << 1);
src = &bg_pattern_cache[((temp << 6) | (v_line)) ^ ((attr & 0x1000) >> 6)];
DRAW_SPRITE_TILE(8,atex,lut[1])
}
}
/* Sprite Limit */
if (pixelcount >= max_width)
{
/* Enable sprite masking for next line */
spr_ovr = 1;
/* Stop sprite rendering */
return;
}
}
/* Clear sprite masking for next line */
spr_ovr = 0;
}
void render_obj_m5_im2_ste(int max_width)
{
int i, count, column;
int xpos, width;
int pixelcount = 0;
int masked = 0;
int odd = odd_frame;
uint8 *src, *s, *lb;
uint32 temp, v_line;
uint32 attr, name, atex;
#ifndef ALT_RENDERER
/* Merge background layers */
merge(&linebuf[1][0x20], &linebuf[0][0x20], &linebuf[0][0x20], lut[2], max_width);
#endif
/* Clear sprite line buffer */
memset(&linebuf[1][0], 0, max_width + 0x40);
/* Draw sprites in front-to-back order */
for (count = 0; count < object_count; count++)
{
/* Sprite X position */
xpos = object_info[count].xpos;
/* Sprite masking */
if (xpos)
{
/* Requires at least one sprite with xpos > 0 */
spr_ovr = 1;
}
else if (spr_ovr)
{
/* Remaining sprites are not drawn */
masked = 1;
}
/* Display area offset */
xpos = xpos - 0x80;
/* Sprite size */
temp = object_info[count].size;
/* Sprite width */
width = 8 + ((temp & 0x0C) << 1);
/* Update pixel count (off-screen sprites are included) */
pixelcount += width;
/* Is sprite across visible area ? */
if (((xpos + width) > 0) && (xpos < max_width) && !masked)
{
/* Sprite attributes */
attr = object_info[count].attr;
/* Sprite y offset */
v_line = object_info[count].ypos;
/* Sprite priority + palette bits */
atex = (attr >> 9) & 0x70;
/* Pattern name base */
name = attr & 0x03FF;
/* Mask vflip/hflip */
attr &= 0x1800;
/* Pattern name offset lookup table */
s = &name_lut[((attr >> 3) & 0x300) | (temp << 4) | ((v_line & 0x18) >> 1)];
/* Pointer into line buffer */
lb = &linebuf[1][0x20 + xpos];
/* Adjust width for sprite limit */
if (pixelcount > max_width)
{
width = width - pixelcount + max_width;
}
/* Number of tiles to draw */
width = width >> 3;
/* Pattern row index */
v_line = (((v_line & 7) << 1) | odd) << 3;
/* Render sprite patterns */
for(column = 0; column < width; column ++, lb+=8)
{
temp = attr | (((name + s[column]) & 0x3ff) << 1);
src = &bg_pattern_cache[((temp << 6) | (v_line)) ^ ((attr & 0x1000) >> 6)];
DRAW_SPRITE_TILE(8,atex,lut[3])
}
}
/* Sprite Limit */
if (pixelcount >= max_width)
{
/* Enable sprite masking for next line */
spr_ovr = 1;
/* Merge background & sprite layers */
merge(&linebuf[1][0x20],&linebuf[0][0x20],&linebuf[0][0x20],lut[4], max_width);
/* Stop sprite rendering */
return;
}
}
/* Clear sprite masking for next line */
spr_ovr = 0;
/* Merge background & sprite layers */
merge(&linebuf[1][0x20],&linebuf[0][0x20],&linebuf[0][0x20],lut[4], max_width);
}
/*--------------------------------------------------------------------------*/
/* Sprites Parsing functions */
/*--------------------------------------------------------------------------*/
void parse_satb_tms(int line)
{
int i = 0;
/* Sprite counter (4 max. per line) */
int count = 0;
/* no sprites in Text modes */
if (!(reg[1] & 0x10))
{
/* Pointer to sprite attribute table */
uint8 *st = &vram[(reg[5] << 7) & 0x3F80];
/* Y position */
int ypos;
/* Sprite height (8 pixels by default) */
int height = 8;
/* Adjust height for 16x16 sprites */
height <<= ((reg[1] & 0x02) >> 1);
/* Adjust height for zoomed sprites */
height <<= (reg[1] & 0x01);
/* Parse Sprite Table (32 entries) */
do
{
/* Sprite Y position */
ypos = st[i << 2];
/* Check end of sprite list marker */
if (ypos == 0xD0)
{
break;
}
/* Wrap Y coordinate for sprites > 256-32 */
if (ypos >= 224)
{
ypos -= 256;
}
/* Y range */
ypos = line - ypos;
/* Sprite is visble on this line ? */
if ((ypos >= 0) && (ypos < height))
{
/* Sprite overflow */
if (count == 4)
{
/* Flag is set only during active area */
if (line < bitmap.viewport.h)
{
spr_ovr = 0x40;
}
break;
}
/* Adjust Y range back for zoomed sprites */
ypos >>= (reg[1] & 0x01);
/* Store sprite attributes for later processing */
object_info[count].ypos = ypos;
object_info[count].xpos = st[(i << 2) + 1];
object_info[count].attr = st[(i << 2) + 2];
object_info[count].size = st[(i << 2) + 3];
/* Increment Sprite count */
++count;
}
}
while (++i < 32);
}
/* Update sprite count for next line */
object_count = count;
/* Insert number of last sprite entry processed */
status = (status & 0xE0) | (i & 0x1F);
}
void parse_satb_m4(int line)
{
int i = 0;
uint8 *st;
/* Sprite counter (8 max. per line) */
int count = 0;
/* Y position */
int ypos;
/* Sprite height (8x8 or 8x16) */
int height = 8 + ((reg[1] & 0x02) << 2);
/* Sprite attribute table address mask */
uint16 st_mask = ~0x3F80 ^ (reg[5] << 7);
/* Unused bits used as a mask on 315-5124 VDP only */
if (system_hw > SYSTEM_SMS)
{
st_mask |= 0x80;
}
/* Pointer to sprite attribute table */
st = &vram[st_mask & 0x3F00];
/* Parse Sprite Table (64 entries) */
do
{
/* Sprite Y position */
ypos = st[i];
/* Check end of sprite list marker */
if (ypos == (bitmap.viewport.h + 16))
{
break;
}
/* Wrap Y coordinate for sprites > 256-16 */
if (ypos >= 240)
{
ypos -= 256;
}
/* Y range */
ypos = line - ypos;
/* Adjust Y range for zoomed sprites (not working on Mega Drive VDP) */
if (system_hw < SYSTEM_MD)
{
ypos >>= (reg[1] & 0x01);
}
/* Check if sprite is visible on this line */
if ((ypos >= 0) && (ypos < height))
{
/* Sprite overflow */
if (count == 8)
{
/* Flag is set only during active area */
if ((line >= 0) && (line < bitmap.viewport.h))
{
spr_ovr = 0x40;
}
break;
}
/* Store sprite attributes for later processing */
object_info[count].ypos = ypos;
object_info[count].xpos = st[(0x80 + (i << 1)) & st_mask];
object_info[count].attr = st[(0x81 + (i << 1)) & st_mask];
/* Increment Sprite count */
++count;
}
}
while (++i < 64);
/* Update sprite count for next line */
object_count = count;
}
void parse_satb_m5(int line)
{
/* Y position */
int ypos;
/* Sprite height (8,16,24,32 pixels)*/
int height;
/* Sprite size data */
int size;
/* Sprite link data */
int link = 0;
/* Sprite counter */
int count = 0;
/* 16 or 20 sprites max. per line */
int max = 16 + ((reg[12] & 1) << 2);
/* 64 or 80 sprites max. */
int total = max << 2;
/* Pointer to sprite attribute table */
uint16 *p = (uint16 *) &vram[satb];
/* Pointer to internal RAM */
uint16 *q = (uint16 *) &sat[0];
/* Adjust line offset */
line += 0x81;
do
{
/* Read Y position & size from internal SAT */
ypos = (q[link] >> im2_flag) & 0x1FF;
size = q[link + 1] >> 8;
/* Sprite height */
height = 8 + ((size & 3) << 3);
/* Y range */
ypos = line - ypos;
/* Sprite is visble on this line ? */
if ((ypos >= 0) && (ypos < height))
{
/* Sprite overflow */
if (count == max)
{
status |= 0x40;
break;
}
/* Update sprite list */
/* name, attribute & xpos are parsed from VRAM */
object_info[count].attr = p[link + 2];
object_info[count].xpos = p[link + 3] & 0x1ff;
object_info[count].ypos = ypos;
object_info[count].size = size & 0x0f;
++count;
}
/* Read link data from internal SAT */
link = (q[link + 1] & 0x7F) << 2;
/* Last sprite */
if (link == 0) break;
}
while (--total);
/* Update sprite count for next line */
object_count = count;
}
/*--------------------------------------------------------------------------*/
/* Pattern cache update function */
/*--------------------------------------------------------------------------*/
void update_bg_pattern_cache_m4(int index)
{
int i;
uint8 x, y, c;
uint8 *dst;
uint16 name, bp01, bp23;
uint32 bp;
for(i = 0; i < index; i++)
{
/* Get modified pattern name index */
name = bg_name_list[i];
/* Check modified lines */
for(y = 0; y < 8; y++)
{
if(bg_name_dirty[name] & (1 << y))
{
/* Pattern cache base address */
dst = &bg_pattern_cache[name << 6];
/* Byteplane data */
bp01 = *(uint16 *)&vram[(name << 5) | (y << 2) | (0)];
bp23 = *(uint16 *)&vram[(name << 5) | (y << 2) | (2)];
/* Convert to pixel line data (4 bytes = 8 pixels)*/
/* (msb) p7p6 p5p4 p3p2 p1p0 (lsb) */
bp = (bp_lut[bp01] >> 2) | (bp_lut[bp23]);
/* Update cached line (8 pixels = 8 bytes) */
for(x = 0; x < 8; x++)
{
/* Extract pixel data */
c = bp & 0x0F;
/* Pattern cache data (one pattern = 8 bytes) */
/* byte0 <-> p0 p1 p2 p3 p4 p5 p6 p7 <-> byte7 (hflip = 0) */
/* byte0 <-> p7 p6 p5 p4 p3 p2 p1 p0 <-> byte7 (hflip = 1) */
dst[0x00000 | (y << 3) | (x)] = (c); /* vflip=0 & hflip=0 */
dst[0x08000 | (y << 3) | (x ^ 7)] = (c); /* vflip=0 & hflip=1 */
dst[0x10000 | ((y ^ 7) << 3) | (x)] = (c); /* vflip=1 & hflip=0 */
dst[0x18000 | ((y ^ 7) << 3) | (x ^ 7)] = (c); /* vflip=1 & hflip=1 */
/* Next pixel */
bp = bp >> 4;
}
}
}
/* Clear modified pattern flag */
bg_name_dirty[name] = 0;
}
}
void update_bg_pattern_cache_m5(int index)
{
int i;
uint8 x, y, c;
uint8 *dst;
uint16 name;
uint32 bp;
for(i = 0; i < index; i++)
{
/* Get modified pattern name index */
name = bg_name_list[i];
/* Check modified lines */
for(y = 0; y < 8; y ++)
{
if(bg_name_dirty[name] & (1 << y))
{
/* Pattern cache base address */
dst = &bg_pattern_cache[name << 6];
/* Byteplane data (one pattern = 4 bytes) */
/* LIT_ENDIAN: byte0 (lsb) p2p3 p0p1 p6p7 p4p5 (msb) byte3 */
/* BIG_ENDIAN: byte0 (msb) p0p1 p2p3 p4p5 p6p7 (lsb) byte3 */
bp = *(uint32 *)&vram[(name << 5) | (y << 2)];
/* Update cached line (8 pixels = 8 bytes) */
for(x = 0; x < 8; x ++)
{
/* Extract pixel data */
c = bp & 0x0F;
/* Pattern cache data (one pattern = 8 bytes) */
/* byte0 <-> p0 p1 p2 p3 p4 p5 p6 p7 <-> byte7 (hflip = 0) */
/* byte0 <-> p7 p6 p5 p4 p3 p2 p1 p0 <-> byte7 (hflip = 1) */
#ifdef LSB_FIRST
/* Byteplane data = (msb) p4p5 p6p7 p0p1 p2p3 (lsb) */
dst[0x00000 | (y << 3) | (x ^ 3)] = (c); /* vflip=0, hflip=0 */
dst[0x20000 | (y << 3) | (x ^ 4)] = (c); /* vflip=0, hflip=1 */
dst[0x40000 | ((y ^ 7) << 3) | (x ^ 3)] = (c); /* vflip=1, hflip=0 */
dst[0x60000 | ((y ^ 7) << 3) | (x ^ 4)] = (c); /* vflip=1, hflip=1 */
#else
/* Byteplane data = (msb) p0p1 p2p3 p4p5 p6p7 (lsb) */
dst[0x00000 | (y << 3) | (x ^ 7)] = (c); /* vflip=0, hflip=0 */
dst[0x20000 | (y << 3) | (x)] = (c); /* vflip=0, hflip=1 */
dst[0x40000 | ((y ^ 7) << 3) | (x ^ 7)] = (c); /* vflip=1, hflip=0 */
dst[0x60000 | ((y ^ 7) << 3) | (x)] = (c); /* vflip=1, hflip=1 */
#endif
/* Next pixel */
bp = bp >> 4;
}
}
}
/* Clear modified pattern flag */
bg_name_dirty[name] = 0;
}
}
/*--------------------------------------------------------------------------*/
/* Window & Plane A clipping update function (Mode 5) */
/*--------------------------------------------------------------------------*/
void window_clip(unsigned int data, unsigned int sw)
{
/* Window size and invert flags */
int hp = (data & 0x1f);
int hf = (data >> 7) & 1;
/* Perform horizontal clipping; the results are applied in reverse
if the horizontal inversion flag is set
*/
int a = hf;
int w = hf ^ 1;
/* Display width (16 or 20 columns) */
sw = 16 + (sw << 2);
if(hp)
{
if(hp > sw)
{
/* Plane W takes up entire line */
clip[w].left = 0;
clip[w].right = sw;
clip[w].enable = 1;
clip[a].enable = 0;
}
else
{
/* Plane W takes left side, Plane A takes right side */
clip[w].left = 0;
clip[a].right = sw;
clip[a].left = clip[w].right = hp;
clip[0].enable = clip[1].enable = 1;
}
}
else
{
/* Plane A takes up entire line */
clip[a].left = 0;
clip[a].right = sw;
clip[a].enable = 1;
clip[w].enable = 0;
}
}
/*--------------------------------------------------------------------------*/
/* Init, reset routines */
/*--------------------------------------------------------------------------*/
void render_init(void)
{
int bx, ax;
/* Initialize layers priority pixel look-up tables */
uint16 index;
for (bx = 0; bx < 0x100; bx++)
{
for (ax = 0; ax < 0x100; ax++)
{
index = (bx << 8) | (ax);
lut[0][index] = make_lut_bg(bx, ax);
lut[1][index] = make_lut_bgobj(bx, ax);
lut[2][index] = make_lut_bg_ste(bx, ax);
lut[3][index] = make_lut_obj(bx, ax);
lut[4][index] = make_lut_bgobj_ste(bx, ax);
lut[5][index] = make_lut_bgobj_m4(bx,ax);
}
}
/* Initialize pixel color look-up tables */
palette_init();
/* Make sprite pattern name index look-up table (Mode 5) */
make_name_lut();
/* Make bitplane to pixel look-up table (Mode 4) */
make_bp_lut();
}
void render_reset(void)
{
/* Clear display bitmap */
memset(bitmap.data, 0, bitmap.pitch * bitmap.height);
/* Clear line buffers */
memset(linebuf, 0, sizeof(linebuf));
/* Clear color palettes */
memset(pixel, 0, sizeof(pixel));
/* Clear pattern cache */
memset ((char *) bg_pattern_cache, 0, sizeof (bg_pattern_cache));
/* Reset Sprite infos */
spr_ovr = spr_col = object_count = 0;
}
/*--------------------------------------------------------------------------*/
/* Line rendering functions */
/*--------------------------------------------------------------------------*/
void render_line(int line)
{
int width = bitmap.viewport.w;
int x_offset;
/* Check display status */
if (reg[1] & 0x40)
{
/* Update pattern cache */
if (bg_list_index)
{
update_bg_pattern_cache(bg_list_index);
bg_list_index = 0;
}
/* Render BG layer(s) */
render_bg(line, width);
/* Render sprite layer */
render_obj(width);
/* Left-most column blanking */
if (reg[0] & 0x20)
{
if (system_hw > SYSTEM_SG)
{
memset(&linebuf[0][0x20], 0x40, 8);
}
}
/* Parse sprites for next line */
if (line < (bitmap.viewport.h - 1))
{
parse_satb(line);
}
}
else
{
/* Master System & Game Gear VDP specific */
if (system_hw < SYSTEM_MD)
{
/* Update SOVR flag */
status |= spr_ovr;
spr_ovr = 0;
/* Sprites are still parsed when display is disabled */
parse_satb(line);
}
/* Blanked line */
memset(&linebuf[0][0x20], 0x40, width);
}
/* Horizontal borders */
x_offset = bitmap.viewport.x;
if (x_offset > 0)
{
memset(&linebuf[0][0x20 - x_offset], 0x40, x_offset);
memset(&linebuf[0][0x20 + width], 0x40, x_offset);
}
/* Pixel color remapping */
remap_line(line);
}
void blank_line(int line, int offset, int width)
{
memset(&linebuf[0][0x20 + offset], 0x40, width);
remap_line(line);
}
void remap_line(int line)
{
/* Line width */
int width = bitmap.viewport.w + (bitmap.viewport.x * 2);
/* Pixel line buffer */
uint8 *src = &linebuf[0][0x20 - bitmap.viewport.x];
/* Adjust line offset in framebuffer */
line = (line + bitmap.viewport.y) % lines_per_frame;
/* Take care of Game Gear reduced screen when overscan is disabled */
if (line < 0) return;
/* Adjust for interlaced output */
if (interlaced && config.render)
{
line = (line * 2) + odd_frame;
}
/* NTSC Filter (only supported for 15 or 16-bit pixels rendering) */
#if defined(USE_15BPP_RENDERING) || defined(USE_16BPP_RENDERING)
if (config.ntsc)
{
if (reg[12] & 0x01)
{
md_ntsc_blit(md_ntsc, ( MD_NTSC_IN_T const * )pixel, src, width, line);
}
else
{
sms_ntsc_blit(sms_ntsc, ( SMS_NTSC_IN_T const * )pixel, src, width, line);
}
}
else
#endif
{
/* Convert VDP pixel data to output pixel format */
#ifdef CUSTOM_BLITTER
CUSTOM_BLITTER(line, width, pixel, src)
#else
PIXEL_OUT_T *dst =((PIXEL_OUT_T *)&bitmap.data[(line * bitmap.pitch)]);
do
{
*dst++ = pixel[*src++];
}
while (--width);
#endif
}
}
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