mirror of
https://github.com/Oibaf66/frodo-wii.git
synced 2024-11-23 03:49:26 +01:00
275 lines
7.7 KiB
C
275 lines
7.7 KiB
C
|
/*
|
||
|
|
* VIC.h - 6569R5 emulation (line based)
|
||
|
|
*
|
||
|
|
* Frodo (C) 1994-1997,2002 Christian Bauer
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef _VIC_H
|
||
|
|
#define _VIC_H
|
||
|
|
|
||
|
|
|
||
|
|
// Define this if you want global variables instead of member variables
|
||
|
|
#if defined(__i386) || defined(mc68000) || defined(__MC68K__)
|
||
|
|
#define GLOBAL_VARS
|
||
|
|
#endif
|
||
|
|
|
||
|
|
// Define this if you have a processor that can do unaligned accesses quickly
|
||
|
|
#if defined(__i386) || defined(mc68000) || defined(__MC68K__)
|
||
|
|
#define CAN_ACCESS_UNALIGNED
|
||
|
|
#endif
|
||
|
|
|
||
|
|
|
||
|
|
// Total number of raster lines (PAL)
|
||
|
|
const unsigned TOTAL_RASTERS = 0x138;
|
||
|
|
|
||
|
|
// Screen refresh frequency (PAL)
|
||
|
|
const unsigned SCREEN_FREQ = 50;
|
||
|
|
|
||
|
|
|
||
|
|
class MOS6510;
|
||
|
|
class C64Display;
|
||
|
|
class C64;
|
||
|
|
struct MOS6569State;
|
||
|
|
|
||
|
|
|
||
|
|
class MOS6569 {
|
||
|
|
public:
|
||
|
|
MOS6569(C64 *c64, C64Display *disp, MOS6510 *CPU, uint8 *RAM, uint8 *Char, uint8 *Color);
|
||
|
|
|
||
|
|
uint8 ReadRegister(uint16 adr);
|
||
|
|
void WriteRegister(uint16 adr, uint8 byte);
|
||
|
|
#ifdef FRODO_SC
|
||
|
|
bool EmulateCycle(void);
|
||
|
|
#else
|
||
|
|
int EmulateLine(void);
|
||
|
|
#endif
|
||
|
|
void ChangedVA(uint16 new_va); // CIA VA14/15 has changed
|
||
|
|
void TriggerLightpen(void); // Trigger lightpen interrupt
|
||
|
|
void ReInitColors(void);
|
||
|
|
void GetState(MOS6569State *vd);
|
||
|
|
void SetState(MOS6569State *vd);
|
||
|
|
|
||
|
|
#ifdef FRODO_SC
|
||
|
|
uint8 LastVICByte;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
private:
|
||
|
|
#ifndef GLOBAL_VARS
|
||
|
|
void vblank(void);
|
||
|
|
void raster_irq(void);
|
||
|
|
|
||
|
|
uint16 mx[8]; // VIC registers
|
||
|
|
uint8 my[8];
|
||
|
|
uint8 mx8;
|
||
|
|
uint8 ctrl1, ctrl2;
|
||
|
|
uint8 lpx, lpy;
|
||
|
|
uint8 me, mxe, mye, mdp, mmc;
|
||
|
|
uint8 vbase;
|
||
|
|
uint8 irq_flag, irq_mask;
|
||
|
|
uint8 clx_spr, clx_bgr;
|
||
|
|
uint8 ec, b0c, b1c, b2c, b3c, mm0, mm1;
|
||
|
|
uint8 sc[8];
|
||
|
|
|
||
|
|
uint8 *ram, *char_rom, *color_ram; // Pointers to RAM and ROM
|
||
|
|
C64 *the_c64; // Pointer to C64
|
||
|
|
C64Display *the_display; // Pointer to C64Display
|
||
|
|
MOS6510 *the_cpu; // Pointer to 6510
|
||
|
|
|
||
|
|
uint8 colors[256]; // Indices of the 16 C64 colors (16 times mirrored to avoid "& 0x0f")
|
||
|
|
|
||
|
|
uint8 ec_color, b0c_color, b1c_color,
|
||
|
|
b2c_color, b3c_color; // Indices for exterior/background colors
|
||
|
|
uint8 mm0_color, mm1_color; // Indices for MOB multicolors
|
||
|
|
uint8 spr_color[8]; // Indices for MOB colors
|
||
|
|
|
||
|
|
uint32 ec_color_long; // ec_color expanded to 32 bits
|
||
|
|
|
||
|
|
uint8 matrix_line[40]; // Buffer for video line, read in Bad Lines
|
||
|
|
uint8 color_line[40]; // Buffer for color line, read in Bad Lines
|
||
|
|
|
||
|
|
#ifdef __POWERPC__
|
||
|
|
double chunky_tmp[0x180/8]; // Temporary line buffer for speedup
|
||
|
|
#endif
|
||
|
|
uint8 *chunky_line_start; // Pointer to start of current line in bitmap buffer
|
||
|
|
int xmod; // Number of bytes per row
|
||
|
|
|
||
|
|
uint16 raster_y; // Current raster line
|
||
|
|
uint16 irq_raster; // Interrupt raster line
|
||
|
|
uint16 dy_start; // Comparison values for border logic
|
||
|
|
uint16 dy_stop;
|
||
|
|
uint16 rc; // Row counter
|
||
|
|
uint16 vc; // Video counter
|
||
|
|
uint16 vc_base; // Video counter base
|
||
|
|
uint16 x_scroll; // X scroll value
|
||
|
|
uint16 y_scroll; // Y scroll value
|
||
|
|
uint16 cia_vabase; // CIA VA14/15 video base
|
||
|
|
|
||
|
|
uint16 mc[8]; // Sprite data counters
|
||
|
|
|
||
|
|
int display_idx; // Index of current display mode
|
||
|
|
int skip_counter; // Counter for frame-skipping
|
||
|
|
|
||
|
|
long pad0; // Keep buffers long-aligned
|
||
|
|
uint8 spr_coll_buf[0x180]; // Buffer for sprite-sprite collisions and priorities
|
||
|
|
uint8 fore_mask_buf[0x180/8]; // Foreground mask for sprite-graphics collisions and priorities
|
||
|
|
#ifndef CAN_ACCESS_UNALIGNED
|
||
|
|
uint8 text_chunky_buf[40*8]; // Line graphics buffer
|
||
|
|
#endif
|
||
|
|
|
||
|
|
bool display_state; // true: Display state, false: Idle state
|
||
|
|
bool border_on; // Flag: Upper/lower border on (Frodo SC: Main border flipflop)
|
||
|
|
bool frame_skipped; // Flag: Frame is being skipped
|
||
|
|
uint8 bad_lines_enabled; // Flag: Bad Lines enabled for this frame
|
||
|
|
bool lp_triggered; // Flag: Lightpen was triggered in this frame
|
||
|
|
|
||
|
|
#ifdef FRODO_SC
|
||
|
|
uint8 read_byte(uint16 adr);
|
||
|
|
void matrix_access(void);
|
||
|
|
void graphics_access(void);
|
||
|
|
void draw_graphics(void);
|
||
|
|
void draw_sprites(void);
|
||
|
|
void draw_background(void);
|
||
|
|
|
||
|
|
int cycle; // Current cycle in line (1..63)
|
||
|
|
|
||
|
|
uint8 *chunky_ptr; // Pointer in chunky bitmap buffer (this is where out output goes)
|
||
|
|
uint8 *fore_mask_ptr; // Pointer in fore_mask_buf
|
||
|
|
|
||
|
|
uint16 matrix_base; // Video matrix base
|
||
|
|
uint16 char_base; // Character generator base
|
||
|
|
uint16 bitmap_base; // Bitmap base
|
||
|
|
|
||
|
|
bool is_bad_line; // Flag: Current line is bad line
|
||
|
|
bool draw_this_line; // Flag: This line is drawn on the screen
|
||
|
|
bool ud_border_on; // Flag: Upper/lower border on
|
||
|
|
bool vblanking; // Flag: VBlank in next cycle
|
||
|
|
|
||
|
|
bool border_on_sample[5]; // Samples of border state at different cycles (1, 17, 18, 56, 57)
|
||
|
|
uint8 border_color_sample[0x180/8]; // Samples of border color at each "displayed" cycle
|
||
|
|
|
||
|
|
uint8 ref_cnt; // Refresh counter
|
||
|
|
uint8 spr_exp_y; // 8 sprite y expansion flipflops
|
||
|
|
uint8 spr_dma_on; // 8 flags: Sprite DMA active
|
||
|
|
uint8 spr_disp_on; // 8 flags: Sprite display active
|
||
|
|
uint8 spr_draw; // 8 flags: Draw sprite in this line
|
||
|
|
uint16 spr_ptr[8]; // Sprite data pointers
|
||
|
|
uint16 mc_base[8]; // Sprite data counter bases
|
||
|
|
|
||
|
|
uint16 raster_x; // Current raster x position
|
||
|
|
|
||
|
|
int ml_index; // Index in matrix/color_line[]
|
||
|
|
uint8 gfx_data, char_data, color_data, last_char_data;
|
||
|
|
uint8 spr_data[8][4]; // Sprite data read
|
||
|
|
uint8 spr_draw_data[8][4]; // Sprite data for drawing
|
||
|
|
|
||
|
|
uint32 first_ba_cycle; // Cycle when BA first went low
|
||
|
|
#else
|
||
|
|
uint8 *get_physical(uint16 adr);
|
||
|
|
void make_mc_table(void);
|
||
|
|
void el_std_text(uint8 *p, uint8 *q, uint8 *r);
|
||
|
|
void el_mc_text(uint8 *p, uint8 *q, uint8 *r);
|
||
|
|
void el_std_bitmap(uint8 *p, uint8 *q, uint8 *r);
|
||
|
|
void el_mc_bitmap(uint8 *p, uint8 *q, uint8 *r);
|
||
|
|
void el_ecm_text(uint8 *p, uint8 *q, uint8 *r);
|
||
|
|
void el_std_idle(uint8 *p, uint8 *r);
|
||
|
|
void el_mc_idle(uint8 *p, uint8 *r);
|
||
|
|
void el_sprites(uint8 *chunky_ptr);
|
||
|
|
int el_update_mc(int raster);
|
||
|
|
|
||
|
|
uint16 mc_color_lookup[4];
|
||
|
|
|
||
|
|
bool border_40_col; // Flag: 40 column border
|
||
|
|
uint8 sprite_on; // 8 flags: Sprite display/DMA active
|
||
|
|
|
||
|
|
uint8 *matrix_base; // Video matrix base
|
||
|
|
uint8 *char_base; // Character generator base
|
||
|
|
uint8 *bitmap_base; // Bitmap base
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
// VIC state
|
||
|
|
struct MOS6569State {
|
||
|
|
uint8 m0x; // Sprite coordinates
|
||
|
|
uint8 m0y;
|
||
|
|
uint8 m1x;
|
||
|
|
uint8 m1y;
|
||
|
|
uint8 m2x;
|
||
|
|
uint8 m2y;
|
||
|
|
uint8 m3x;
|
||
|
|
uint8 m3y;
|
||
|
|
uint8 m4x;
|
||
|
|
uint8 m4y;
|
||
|
|
uint8 m5x;
|
||
|
|
uint8 m5y;
|
||
|
|
uint8 m6x;
|
||
|
|
uint8 m6y;
|
||
|
|
uint8 m7x;
|
||
|
|
uint8 m7y;
|
||
|
|
uint8 mx8;
|
||
|
|
|
||
|
|
uint8 ctrl1; // Control registers
|
||
|
|
uint8 raster;
|
||
|
|
uint8 lpx;
|
||
|
|
uint8 lpy;
|
||
|
|
uint8 me;
|
||
|
|
uint8 ctrl2;
|
||
|
|
uint8 mye;
|
||
|
|
uint8 vbase;
|
||
|
|
uint8 irq_flag;
|
||
|
|
uint8 irq_mask;
|
||
|
|
uint8 mdp;
|
||
|
|
uint8 mmc;
|
||
|
|
uint8 mxe;
|
||
|
|
uint8 mm;
|
||
|
|
uint8 md;
|
||
|
|
|
||
|
|
uint8 ec; // Color registers
|
||
|
|
uint8 b0c;
|
||
|
|
uint8 b1c;
|
||
|
|
uint8 b2c;
|
||
|
|
uint8 b3c;
|
||
|
|
uint8 mm0;
|
||
|
|
uint8 mm1;
|
||
|
|
uint8 m0c;
|
||
|
|
uint8 m1c;
|
||
|
|
uint8 m2c;
|
||
|
|
uint8 m3c;
|
||
|
|
uint8 m4c;
|
||
|
|
uint8 m5c;
|
||
|
|
uint8 m6c;
|
||
|
|
uint8 m7c;
|
||
|
|
// Additional registers
|
||
|
|
uint8 pad0;
|
||
|
|
uint16 irq_raster; // IRQ raster line
|
||
|
|
uint16 vc; // Video counter
|
||
|
|
uint16 vc_base; // Video counter base
|
||
|
|
uint8 rc; // Row counter
|
||
|
|
uint8 spr_dma; // 8 Flags: Sprite DMA active
|
||
|
|
uint8 spr_disp; // 8 Flags: Sprite display active
|
||
|
|
uint8 mc[8]; // Sprite data counters
|
||
|
|
uint8 mc_base[8]; // Sprite data counter bases
|
||
|
|
bool display_state; // true: Display state, false: Idle state
|
||
|
|
bool bad_line; // Flag: Bad Line state
|
||
|
|
bool bad_line_enable; // Flag: Bad Lines enabled for this frame
|
||
|
|
bool lp_triggered; // Flag: Lightpen was triggered in this frame
|
||
|
|
bool border_on; // Flag: Upper/lower border on (Frodo SC: Main border flipflop)
|
||
|
|
|
||
|
|
uint16 bank_base; // VIC bank base address
|
||
|
|
uint16 matrix_base; // Video matrix base
|
||
|
|
uint16 char_base; // Character generator base
|
||
|
|
uint16 bitmap_base; // Bitmap base
|
||
|
|
uint16 sprite_base[8]; // Sprite bases
|
||
|
|
|
||
|
|
// Frodo SC:
|
||
|
|
int cycle; // Current cycle in line (1..63)
|
||
|
|
uint16 raster_x; // Current raster x position
|
||
|
|
int ml_index; // Index in matrix/color_line[]
|
||
|
|
uint8 ref_cnt; // Refresh counter
|
||
|
|
uint8 last_vic_byte; // Last byte read by VIC
|
||
|
|
bool ud_border_on; // Flag: Upper/lower border on
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif
|