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.improved mid-frame screen changes (fixes Bugs Bunny in Double Trouble)

Browse Source 
.improved VDP FIFO timing accuracy
.improved Z80 interrupt accuracy
.modified CPU Hard Reset start cycles
This commit is contained in:
ekeeke31 2010-06-10 07:57:18 +00:00
parent f21a08ebfa
commit 12606da28e
11 changed files with 204 additions and 143 deletions
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2
HISTORY.txt
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@ -27,7 +27,6 @@ of samples per frame and keeping PSG & FM chips in sync.
* added support for 2-Cell vertical scrolling in Interlaced 2 mode * added support for 2-Cell vertical scrolling in Interlaced 2 mode
* added proper HV Counter latch support (fixes Sunset Riders intro) * added proper HV Counter latch support (fixes Sunset Riders intro)
* fixed left-most column vertical scrolling when horizontally scrolled (Gynoug, F1) * fixed left-most column vertical scrolling when horizontally scrolled (Gynoug, F1)
* fixed VBLANK transition line checks
* improved VDP FIFO timings accuracy: fixes Sol Deace intro * improved VDP FIFO timings accuracy: fixes Sol Deace intro
* improved sprite masking accuracy (thanks to Nemesis for his sprite test program) * improved sprite masking accuracy (thanks to Nemesis for his sprite test program)
* improved HBLANK flag timing accuracy: fixes Mega Turrican (Sky level) * improved HBLANK flag timing accuracy: fixes Mega Turrican (Sky level)
@ -41,6 +40,7 @@ of samples per frame and keeping PSG & FM chips in sync.
--------------- ---------------
* updated Z80 core to last version (fixes interrupt Mode 0 timing and some BIT instructions). * updated Z80 core to last version (fixes interrupt Mode 0 timing and some BIT instructions).
* fixed some Z80 instructions timing. * fixed some Z80 instructions timing.
* improved Z80 interrupt accuracy
* improved 68k accuracy (initial Reset timing + auto-vectored interrupts handling). * improved 68k accuracy (initial Reset timing + auto-vectored interrupts handling).
* improved 68k timing accuracy for DIVU/DVIS (thanks to Jorge Cwik) & MULU/MULS instructions. * improved 68k timing accuracy for DIVU/DVIS (thanks to Jorge Cwik) & MULU/MULS instructions.
* improved Z80 & 68k cpu execution/synchronization accuracy by using Master Clock as common reference (now run exactly 3420 M-Cycles per line). * improved Z80 & 68k cpu execution/synchronization accuracy by using Master Clock as common reference (now run exactly 3420 M-Cycles per line).

26
source/genesis.c
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@ -125,12 +125,14 @@ void gen_hardreset(void)
if (config.bios_enabled == 3) if (config.bios_enabled == 3)
m68k_memory_map[0].base = bios_rom; m68k_memory_map[0].base = bios_rom;
/* Reset CPU cycle counts */ /* Reset CPU cycles (check EA logo corruption, no glitches for Skitchin/Budokan on PAL 60hz MD2 with TMSS) */
mcycles_68k = 0; mcycles_68k = mcycles_z80 = (rand() % lines_per_frame) * MCYCLES_PER_LINE;
mcycles_z80 = 0;
zstate = 0; /* Z80 is resetted & has control of the bus */ /* Z80 bus is released & Z80 reset is asserted */
zbank = 0; /* Assume default bank is $000000-$007FFF */ zstate = 0;
/* Assume default bank is $000000-$007FFF */
zbank = 0;
/* Reset 68k, Z80 & YM2612 */ /* Reset 68k, Z80 & YM2612 */
m68k_pulse_reset(); m68k_pulse_reset();
@ -149,11 +151,11 @@ void gen_softreset(int state)
} }
else else
{ {
/* Reset Action Replay */ /* Reset Pro Action Replay (required in Trainer mode) */
if (config.lock_on == TYPE_AR) if (config.lock_on == TYPE_AR)
datel_reset(0); datel_reset(0);
/* VDP is not reseted so 68k & Z80 could restart anywhere in the emulated frame */ /* 68k & Z80 could restart anywhere in VDP frame (fixes Eternal Champions, X-Men 2) */
mcycles_68k = mcycles_z80 = (uint32)((MCYCLES_PER_LINE * lines_per_frame) * ((double)rand() / (double)RAND_MAX)); mcycles_68k = mcycles_z80 = (uint32)((MCYCLES_PER_LINE * lines_per_frame) * ((double)rand() / (double)RAND_MAX));
/* Reset 68k, Z80 & YM2612 */ /* Reset 68k, Z80 & YM2612 */
@ -199,7 +201,7 @@ void gen_reset_w(uint32 state, uint32 cycles)
if (state == (zstate & 1)) if (state == (zstate & 1))
return; return;
if (state) /* !ZRESET released */ if (state) /* !ZRESET inactive */
{ {
/* if z80 is restarted, resynchronize with 68k */ /* if z80 is restarted, resynchronize with 68k */
if (zstate == 0) if (zstate == 0)
@ -208,16 +210,16 @@ void gen_reset_w(uint32 state, uint32 cycles)
/* reset Z80 */ /* reset Z80 */
z80_reset(); z80_reset();
/* release Z80 reset */ /* negate Z80 reset */
zstate |= 1; zstate |= 1;
} }
else /* !ZRESET enabled */ else /* !ZRESET active */
{ {
/* if z80 was running, resynchronize with 68k */ /* if z80 was running, resynchronize with 68k */
if (zstate == 1) if (zstate == 1)
z80_run(cycles); z80_run(cycles);
/* hold Z80 reset */ /* assert Z80 reset */
zstate &= 2; zstate &= 2;
} }
@ -232,7 +234,5 @@ void gen_bank_w (uint32 state)
int z80_irq_callback (int param) int z80_irq_callback (int param)
{ {
zirq = 0;
z80_set_irq_line (0, CLEAR_LINE);
return 0xFF; return 0xFF;
} }

2
source/gx/config.c
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@ -96,7 +96,7 @@ void config_default(void)
config.xscale = 0; config.xscale = 0;
config.yscale = 0; config.yscale = 0;
config.aspect = 1; config.aspect = 1;
config.overscan = 1; config.overscan = 3;
if (VIDEO_HaveComponentCable()) if (VIDEO_HaveComponentCable())
config.render = 2; config.render = 2;
else else

2
source/gx/fileio/file_slot.c
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@ -437,7 +437,7 @@ int slot_save(int slot, int device)
return 0; return 0;
} }
/* Read into buffer (2k blocks) */ /* Write from buffer (2k blocks) */
while (filesize > FATCHUNK) while (filesize > FATCHUNK)
{ {
fwrite(savebuffer + done, FATCHUNK, 1, fp); fwrite(savebuffer + done, FATCHUNK, 1, fp);

22
source/gx/gui/menu.c
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@ -1050,7 +1050,7 @@ static void systemmenu ()
else if (config.region_detect == 2) else if (config.region_detect == 2)
sprintf (items[0].text, "Console Region: EUR"); sprintf (items[0].text, "Console Region: EUR");
else if (config.region_detect == 3) else if (config.region_detect == 3)
sprintf (items[0].text, "Console Region: JAP"); sprintf (items[0].text, "Console Region: JPN");
if (cart.romsize) if (cart.romsize)
{ {
@ -1211,7 +1211,14 @@ static void videomenu ()
else else
sprintf (items[VI_OFFSET].text, "NTSC Filter: OFF"); sprintf (items[VI_OFFSET].text, "NTSC Filter: OFF");
sprintf (items[VI_OFFSET+1].text, "Borders: %s", config.overscan ? "ON" : "OFF"); if (config.overscan == 3)
sprintf (items[VI_OFFSET+1].text, "Borders: ALL");
else if (config.overscan == 2)
sprintf (items[VI_OFFSET+1].text, "Borders: H ONLY");
else if (config.overscan == 1)
sprintf (items[VI_OFFSET+1].text, "Borders: V ONLY");
else
sprintf (items[VI_OFFSET+1].text, "Borders: NONE");
if (config.aspect == 1) if (config.aspect == 1)
sprintf (items[VI_OFFSET+2].text,"Aspect: ORIGINAL (4:3)"); sprintf (items[VI_OFFSET+2].text,"Aspect: ORIGINAL (4:3)");
@ -1360,8 +1367,15 @@ static void videomenu ()
break; break;
case VI_OFFSET+1: /*** overscan emulation ***/ case VI_OFFSET+1: /*** overscan emulation ***/
config.overscan ^= 1; config.overscan = (config.overscan + 1) % 4;
sprintf (items[VI_OFFSET+1].text, "Borders: %s", config.overscan ? "ON" : "OFF"); if (config.overscan == 3)
sprintf (items[VI_OFFSET+1].text, "Borders: ALL");
else if (config.overscan == 2)
sprintf (items[VI_OFFSET+1].text, "Borders: H ONLY");
else if (config.overscan == 1)
sprintf (items[VI_OFFSET+1].text, "Borders: V ONLY");
else
sprintf (items[VI_OFFSET+1].text, "Borders: NONE");
break; break;
case VI_OFFSET+2: /*** aspect ratio ***/ case VI_OFFSET+2: /*** aspect ratio ***/

32
source/gx/gx_video.c
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@ -1332,24 +1332,8 @@ void gx_video_Start(void)
tvmodes[2]->xfbMode = VI_XFBMODE_DF; tvmodes[2]->xfbMode = VI_XFBMODE_DF;
} }
/* overscan emulation */ /* force video update */
if (config.overscan) bitmap.viewport.changed = 3;
{
bitmap.viewport.x = (reg[12] & 1) ? 16 : 12;
bitmap.viewport.y = (reg[1] & 8) ? 0 : 8;
if (vdp_pal)
bitmap.viewport.y += 24;
}
else
{
bitmap.viewport.x = 0;
bitmap.viewport.y = 0;
}
/* reinitialize video size */
vwidth = bitmap.viewport.w + (2 * bitmap.viewport.x);
vheight = bitmap.viewport.h + (2 * bitmap.viewport.y);
bitmap.viewport.changed = 1;
/* NTSC filter */ /* NTSC filter */
if (config.ntsc) if (config.ntsc)
@ -1394,28 +1378,22 @@ void gx_video_Start(void)
/* GX render update */ /* GX render update */
void gx_video_Update(void) void gx_video_Update(void)
{ {
int update = bitmap.viewport.changed; int update = bitmap.viewport.changed & 1;
/* check if display has changed */ /* check if display has changed */
if (update) if (update)
{ {
/* update texture size */ /* update texture size */
int old_vwidth = vwidth;
vwidth = bitmap.viewport.w + (2 * bitmap.viewport.x); vwidth = bitmap.viewport.w + (2 * bitmap.viewport.x);
vheight = bitmap.viewport.h + (2 * bitmap.viewport.y); vheight = bitmap.viewport.h + (2 * bitmap.viewport.y);
/* if width has been changed, do no render this frame */
/* this fixes texture glitches when changing width middle-frame */
if (vwidth != old_vwidth)
return;
/* interlaced mode */ /* interlaced mode */
if (config.render && interlaced) if (config.render && interlaced)
vheight = vheight << 1; vheight = vheight << 1;
/* ntsc filter */ /* ntsc filter */
if (config.ntsc) if (config.ntsc)
vwidth = (reg[12]&1) ? MD_NTSC_OUT_WIDTH(vwidth) : SMS_NTSC_OUT_WIDTH(vwidth); vwidth = (reg[12] & 1) ? MD_NTSC_OUT_WIDTH(vwidth) : SMS_NTSC_OUT_WIDTH(vwidth);
/* texels size must be multiple of 4 */ /* texels size must be multiple of 4 */
vwidth = (vwidth >> 2) << 2; vwidth = (vwidth >> 2) << 2;
@ -1488,7 +1466,7 @@ void gx_video_Update(void)
/* force audio DMA resynchronization */ /* force audio DMA resynchronization */
audioStarted = 0; audioStarted = 0;
bitmap.viewport.changed = 0; bitmap.viewport.changed &= ~1;
} }
} }

45
source/render.c
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@ -1490,8 +1490,9 @@ static void render_obj(int line, uint8 *buf, uint8 *table)
int height; int height;
int v_line; int v_line;
int column; int column;
int max = bitmap.viewport.w;
int left = 0x80; int left = 0x80;
int right = 0x80 + bitmap.viewport.w; int right = 0x80 + max;
uint8 *s, *lb; uint8 *s, *lb;
uint16 name, index; uint16 name, index;
@ -1506,7 +1507,9 @@ static void render_obj(int line, uint8 *buf, uint8 *table)
/* sprite masking (requires at least one sprite with xpos > 0) */ /* sprite masking (requires at least one sprite with xpos > 0) */
if (xpos) if (xpos)
{
spr_over = 1; spr_over = 1;
}
else if (spr_over) else if (spr_over)
{ {
spr_over = 0; spr_over = 0;
@ -1539,9 +1542,9 @@ static void render_obj(int line, uint8 *buf, uint8 *table)
/* number of tiles to draw */ /* number of tiles to draw */
/* adjusted for sprite limit */ /* adjusted for sprite limit */
if (pixelcount > bitmap.viewport.w) if (pixelcount > max)
{ {
width -= (pixelcount - bitmap.viewport.w); width -= (pixelcount - max);
} }
width >>= 3; width >>= 3;
@ -1555,7 +1558,7 @@ static void render_obj(int line, uint8 *buf, uint8 *table)
} }
/* sprite limit (256 or 320 pixels) */ /* sprite limit (256 or 320 pixels) */
if (pixelcount >= bitmap.viewport.w) if (pixelcount >= max)
{ {
spr_over = 1; spr_over = 1;
return; return;
@ -1580,8 +1583,9 @@ static void render_obj_im2(int line, int odd, uint8 *buf, uint8 *table)
int height; int height;
int v_line; int v_line;
int column; int column;
int max = bitmap.viewport.w;
int left = 0x80; int left = 0x80;
int right = 0x80 + bitmap.viewport.w; int right = 0x80 + max;
uint8 *s, *lb; uint8 *s, *lb;
uint16 name, index; uint16 name, index;
@ -1597,7 +1601,9 @@ static void render_obj_im2(int line, int odd, uint8 *buf, uint8 *table)
/* sprite masking (requires at least one sprite with xpos > 0) */ /* sprite masking (requires at least one sprite with xpos > 0) */
if (xpos) if (xpos)
{
spr_over = 1; spr_over = 1;
}
else if(spr_over) else if(spr_over)
{ {
spr_over = 0; spr_over = 0;
@ -1630,8 +1636,8 @@ static void render_obj_im2(int line, int odd, uint8 *buf, uint8 *table)
/* number of tiles to draw */ /* number of tiles to draw */
/* adjusted for sprite limit */ /* adjusted for sprite limit */
if (pixelcount > bitmap.viewport.w) if (pixelcount > max)
width -= (pixelcount - bitmap.viewport.w); width -= (pixelcount - max);
width >>= 3; width >>= 3;
for(column = 0; column < width; column += 1, lb+=8) for(column = 0; column < width; column += 1, lb+=8)
@ -1646,7 +1652,7 @@ static void render_obj_im2(int line, int odd, uint8 *buf, uint8 *table)
} }
/* sprite limit (256 or 320 pixels) */ /* sprite limit (256 or 320 pixels) */
if (pixelcount >= bitmap.viewport.w) if (pixelcount >= max)
{ {
spr_over = 1; spr_over = 1;
return; return;
@ -1736,25 +1742,24 @@ void render_shutdown(void)
/* Line render function */ /* Line render function */
/*--------------------------------------------------------------------------*/ /*--------------------------------------------------------------------------*/
void render_line(int line, int overscan) void render_line(int line)
{ {
int width = bitmap.viewport.w;
int x_offset = bitmap.viewport.x;
/* display OFF */ /* display OFF */
if (reg[0] & 0x01) if (reg[0] & 0x01)
return; return;
uint8 *lb = tmp_buf;
int width = bitmap.viewport.w;
int x_offset = bitmap.viewport.x;
/* background color (blanked display or vertical borders) */ /* background color (blanked display or vertical borders) */
if (!(reg[1] & 0x40) || overscan) if (!(reg[1] & 0x40) || (status & 8))
{ {
width += 2 * x_offset; width += 2 * x_offset;
memset(&tmp_buf[0x20 - x_offset], 0x40, width); memset(&lb[0x20 - x_offset], 0x40, width);
} }
else else
{ {
uint8 *lb = tmp_buf;
/* update pattern generator */ /* update pattern generator */
if (bg_list_index) if (bg_list_index)
{ {
@ -1810,7 +1815,11 @@ void render_line(int line, int overscan)
} }
} }
/* borders */ /* left-most column blanking */
if(reg[0] & 0x20)
memset(&lb[0x20], 0x40, 0x08);
/* horizontal borders */
if (x_offset) if (x_offset)
{ {
memset(&lb[0x20 - x_offset], 0x40, x_offset); memset(&lb[0x20 - x_offset], 0x40, x_offset);
@ -1877,7 +1886,7 @@ void window_clip(void)
int hf = (reg[17] >> 7) & 1; int hf = (reg[17] >> 7) & 1;
/* Display size */ /* Display size */
int sw = bitmap.viewport.w >> 4; int sw = (reg[12] & 1) ? 20 : 16;
/* Clear clipping data */ /* Clear clipping data */
memset(&clip, 0, sizeof(clip)); memset(&clip, 0, sizeof(clip));

2
source/render.h
View File

@ -31,7 +31,7 @@ extern uint32 object_index_count;
extern void render_init(void); extern void render_init(void);
extern void render_reset(void); extern void render_reset(void);
extern void render_shutdown(void); extern void render_shutdown(void);
extern void render_line(int line, int overscan); extern void render_line(int line);
extern void remap_buffer(int line,int width); extern void remap_buffer(int line,int width);
extern void window_clip(void); extern void window_clip(void);
extern void parse_satb(int line); extern void parse_satb(int line);

95
source/system.c
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@ -327,19 +327,52 @@ void system_shutdown (void)
****************************************************************/ ****************************************************************/
void system_frame (int do_skip) void system_frame (int do_skip)
{ {
/* update display settings */ int start = 0;
int line; int end = 0;
int vdp_height = bitmap.viewport.h; int line = 0;
int end_line = vdp_height + bitmap.viewport.y;
int start_line = lines_per_frame - bitmap.viewport.y; /* display changed during VBLANK */
int old_interlaced = interlaced; if (bitmap.viewport.changed & 2)
interlaced = (reg[12] & 2) >> 1;
if (old_interlaced != interlaced)
{ {
bitmap.viewport.changed = 1; bitmap.viewport.changed &= ~2;
im2_flag = ((reg[12] & 6) == 6);
odd_frame = 1; /* interlaced mode */
int old_interlaced = interlaced;
interlaced = (reg[12] & 2) >> 1;
if (old_interlaced != interlaced)
{
im2_flag = ((reg[12] & 6) == 6);
odd_frame = 1;
bitmap.viewport.changed = 1;
}
/* screen height */
if (reg[1] & 8)
{
bitmap.viewport.h = 240;
bitmap.viewport.y = (config.overscan & 1) ? (vdp_pal ? 24 : 0) : 0;
}
else
{
bitmap.viewport.h = 224;
bitmap.viewport.y = (config.overscan & 1) ? (vdp_pal ? 32 : 8) : 0;
}
/* screen width */
if (reg[12] & 1)
{
bitmap.viewport.w = 320;
bitmap.viewport.x = (config.overscan & 2) ? 16 : 0;
}
else
{
bitmap.viewport.w = 256;
bitmap.viewport.x = (config.overscan & 2) ? 12 : 0;
}
} }
/* Z80 interrupt flag */
int zirq = 0;
/* clear VBLANK, DMA, FIFO FULL & field flags */ /* clear VBLANK, DMA, FIFO FULL & field flags */
status &= 0xFEE5; status &= 0xFEE5;
@ -349,8 +382,8 @@ void system_frame (int do_skip)
/* even/odd field flag (interlaced modes only) */ /* even/odd field flag (interlaced modes only) */
odd_frame ^= 1; odd_frame ^= 1;
if (odd_frame && interlaced) if (interlaced)
status |= 0x0010; status |= (odd_frame << 4);
/* reload HCounter */ /* reload HCounter */
int h_counter = reg[10]; int h_counter = reg[10];
@ -382,10 +415,10 @@ void system_frame (int do_skip)
if (status & 8) if (status & 8)
{ {
/* render overscan */ /* render overscan */
if (!do_skip && ((line < end_line) || (line >= start_line))) if (!do_skip && ((line < end) || (line >= start)))
render_line(line, 1); render_line(line);
/* clear any pending Z80 interrupt */ /* clear pending Z80 interrupt */
if (zirq) if (zirq)
{ {
zirq = 0; zirq = 0;
@ -406,18 +439,34 @@ void system_frame (int do_skip)
} }
/* end of active display */ /* end of active display */
if (line == vdp_height) if (line == bitmap.viewport.h)
{ {
/* render overscan */ /* set border area */
if (!do_skip && (line < end_line)) start = lines_per_frame - bitmap.viewport.y;
render_line(line, 1); end = bitmap.viewport.h + bitmap.viewport.y;
/* update inputs (doing this here fix Warriors of Eternal Sun) */ /* check viewport changes */
osd_input_Update(); if (bitmap.viewport.h != bitmap.viewport.oh)
{
bitmap.viewport.oh = bitmap.viewport.h;
bitmap.viewport.changed |= 1;
}
if (bitmap.viewport.w != bitmap.viewport.ow)
{
bitmap.viewport.ow = bitmap.viewport.w;
bitmap.viewport.changed |= 1;
}
/* set VBLANK flag */ /* set VBLANK flag */
status |= 0x08; status |= 0x08;
/* render overscan */
if (!do_skip && bitmap.viewport.y)
render_line(line);
/* update inputs (doing this here fix Warriors of Eternal Sun) */
osd_input_Update();
/* Z80 interrupt is 16ms period (one frame) and 64us length (one scanline) */ /* Z80 interrupt is 16ms period (one frame) and 64us length (one scanline) */
zirq = 1; zirq = 1;
z80_set_irq_line(0, ASSERT_LINE); z80_set_irq_line(0, ASSERT_LINE);
@ -445,7 +494,7 @@ void system_frame (int do_skip)
parse_satb(0x80 + line); parse_satb(0x80 + line);
/* render scanline */ /* render scanline */
render_line(line, 0); render_line(line);
} }
} }

118
source/vdp.c
View File

@ -50,7 +50,6 @@ uint16 status; /* VDP status flags */
uint8 dmafill; /* next VDP Write is DMA Fill */ uint8 dmafill; /* next VDP Write is DMA Fill */
uint8 hint_pending; /* 0= Line interrupt is pending */ uint8 hint_pending; /* 0= Line interrupt is pending */
uint8 vint_pending; /* 1= Frame interrupt is pending */ uint8 vint_pending; /* 1= Frame interrupt is pending */
uint8 zirq; /* Z80 IRQ status */
uint8 irq_status; /* 68K IRQ status */ uint8 irq_status; /* 68K IRQ status */
/* Global variables */ /* Global variables */
@ -161,7 +160,6 @@ void vdp_reset(void)
pending = 0; pending = 0;
hint_pending = 0; hint_pending = 0;
vint_pending = 0; vint_pending = 0;
zirq = 0;
irq_status = 0; irq_status = 0;
hvc_latch = 0; hvc_latch = 0;
v_counter = 0; v_counter = 0;
@ -204,21 +202,21 @@ void vdp_reset(void)
hctab = cycle2hc32; hctab = cycle2hc32;
/* reset display area */ /* reset display area */
bitmap.viewport.w = 256; bitmap.viewport.w = 256;
bitmap.viewport.h = 224; bitmap.viewport.h = 224;
bitmap.viewport.changed = 1; bitmap.viewport.ow = 256;
bitmap.viewport.oh = 224;
/* reset overscan area */ /* reset overscan area */
bitmap.viewport.x = 0; bitmap.viewport.x = 0;
bitmap.viewport.y = 0; bitmap.viewport.y = 0;
if (config.overscan) if (config.overscan & 1)
{
bitmap.viewport.x = 12;
bitmap.viewport.y = vdp_pal ? 32 : 8; bitmap.viewport.y = vdp_pal ? 32 : 8;
} if (config.overscan & 2)
bitmap.viewport.x = 12;
/* initialize some registers (normally set by BIOS) */ /* reset some registers normally set by BIOS */
if (config.bios_enabled != 3) if (config.bios_enabled == 1)
{ {
reg_w(0 , 0x04); /* Palette bit set */ reg_w(0 , 0x04); /* Palette bit set */
reg_w(1 , 0x04); /* Mode 5 enabled */ reg_w(1 , 0x04); /* Mode 5 enabled */
@ -244,11 +242,6 @@ void vdp_restore(uint8 *vdp_regs)
vctab = (vdp_pal) ? ((reg[1] & 8) ? vc_pal_240 : vc_pal_224) : vc_ntsc_224; vctab = (vdp_pal) ? ((reg[1] & 8) ? vc_pal_240 : vc_pal_224) : vc_ntsc_224;
hctab = (reg[12] & 1) ? cycle2hc40 : cycle2hc32; hctab = (reg[12] & 1) ? cycle2hc40 : cycle2hc32;
/* reinitialize overscan area */
bitmap.viewport.x = config.overscan ? ((reg[12] & 1) ? 16 : 12) : 0;
bitmap.viewport.y = config.overscan ? (((reg[1] & 8) ? 0 : 8) + (vdp_pal ? 24 : 0)) : 0;
bitmap.viewport.changed = 1;
/* restore FIFO timings */ /* restore FIFO timings */
fifo_latency = (reg[12] & 1) ? 190 : 214; fifo_latency = (reg[12] & 1) ? 190 : 214;
if ((code & 0x0F) == 0x01) if ((code & 0x0F) == 0x01)
@ -501,18 +494,12 @@ void vdp_data_w(unsigned int data)
/* update VDP FIFO */ /* update VDP FIFO */
fifo_update(mcycles_68k); fifo_update(mcycles_68k);
if (fifo_write_cnt == 0)
{
/* reset cycle counter */
fifo_lastwrite = mcycles_68k;
/* FIFO is not empty anymore */
status &= 0xFDFF;
}
/* increase FIFO word count */ /* increase FIFO word count */
fifo_write_cnt ++; fifo_write_cnt ++;
/* FIFO is not empty anymore */
status &= 0xFDFF;
/* FIFO full ? */ /* FIFO full ? */
if (fifo_write_cnt >= 4) if (fifo_write_cnt >= 4)
{ {
@ -818,26 +805,29 @@ static void reg_w(unsigned int r, unsigned int d)
/* See if the viewport height has actually been changed */ /* See if the viewport height has actually been changed */
if (r & 0x08) if (r & 0x08)
{ {
/* PAL mode only ! */ /* Update V Counter table */
if (vdp_pal) if (vdp_pal)
vctab = (d & 8) ? vc_pal_240 : vc_pal_224;
/* Update viewport */
if (status & 8)
{ {
/* changes should be applied on next frame */
bitmap.viewport.changed |= 2;
}
else
{
/* Update active display */
if (d & 8) if (d & 8)
{ {
bitmap.viewport.h = 240; bitmap.viewport.h = 240;
if (config.overscan) bitmap.viewport.y = (config.overscan & 1) ? (vdp_pal ? 24 : 0) : 0;
bitmap.viewport.y = 24;
vctab = vc_pal_240;
} }
else else
{ {
bitmap.viewport.h = 224; bitmap.viewport.h = 224;
if (config.overscan) bitmap.viewport.y = (config.overscan & 1) ? (vdp_pal ? 32 : 8) : 0;
bitmap.viewport.y = 32;
vctab = vc_pal_224;
} }
/* update viewport */
bitmap.viewport.changed = 1;
} }
} }
@ -861,8 +851,8 @@ static void reg_w(unsigned int r, unsigned int d)
#ifdef LOGVDP #ifdef LOGVDP
error("Line redrawn (%d sprites) \n",object_index_count); error("Line redrawn (%d sprites) \n",object_index_count);
#endif #endif
/* re-render line */ /* redraw entire line */
render_line(v_counter, 0); render_line(v_counter);
} }
#ifdef LOGVDP #ifdef LOGVDP
else else
@ -939,12 +929,7 @@ static void reg_w(unsigned int r, unsigned int d)
/* Update HC table */ /* Update HC table */
hctab = cycle2hc40; hctab = cycle2hc40;
/* Update viewport width */
bitmap.viewport.w = 320;
if (config.overscan)
bitmap.viewport.x = 16;
/* Update fifo timings */ /* Update fifo timings */
fifo_latency = 190; fifo_latency = 190;
} }
@ -959,23 +944,50 @@ static void reg_w(unsigned int r, unsigned int d)
/* Update HC table */ /* Update HC table */
hctab = cycle2hc32; hctab = cycle2hc32;
/* Update viewport width */
bitmap.viewport.w = 256;
if (config.overscan)
bitmap.viewport.x = 12;
/* Update fifo timings */ /* Update fifo timings */
fifo_latency = 214; fifo_latency = 214;
} }
if ((code & 0x0F) == 0x01)
fifo_latency *= 2;
/* Update viewport */ if ((code & 0x0F) == 0x01)
bitmap.viewport.changed = 1; fifo_latency = fifo_latency * 2;
/* Update clipping */ /* Update clipping */
window_clip(); window_clip();
/* Update viewport */
if (status & 8)
{
/* changes should be applied on next frame */
bitmap.viewport.changed |= 2;
}
else
{
/* Update active display */
if (d & 1)
{
bitmap.viewport.w = 320;
bitmap.viewport.x = (config.overscan & 2) ? 16 : 0;
}
else
{
bitmap.viewport.w = 256;
bitmap.viewport.x = (config.overscan & 2) ? 12 : 0;
}
/* display width changed during HBLANK (Bugs Bunny Double Trouble) */
if (mcycles_68k <= (mcycles_vdp + 860))
{
/* redraw entire line */
render_line(v_counter);
}
}
}
/* Interlaced modes */
if (r & 0x06)
{
/* changes should be applied on next frame */
bitmap.viewport.changed |= 2;
} }
/* See if the S/TE mode bit has changed */ /* See if the S/TE mode bit has changed */

1
source/vdp.h
View File

@ -38,7 +38,6 @@ extern uint16 status;
extern uint8 dmafill; extern uint8 dmafill;
extern uint8 hint_pending; extern uint8 hint_pending;
extern uint8 vint_pending; extern uint8 vint_pending;
extern uint8 zirq;
extern uint8 irq_status; extern uint8 irq_status;
/* Global variables */ /* Global variables */