// F02298 W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx B_Z0 - Z0
// ------------------------------------------------------------
-#include <SDL.h>
+//#include <SDL.h>
#include "tom.h"
+#include "video.h"
#include "gpu.h"
#include "objectp.h"
#include "cry2rgb.h"
+#include "settings.h"
// TOM registers (offset from $F00000)
#define BGEN 0x0080 // Background enable (CRY & RGB16 only)
#define VARMOD 0x0100 // Mixed CRY/RGB16 mode (only works in MODE 0!)
#define PWIDTH 0x0E00 // Pixel width in video clock cycles (value written + 1)
+#define BORD1 0x2A // Border green/red values (8 BPP)
+#define BORD2 0x2C // Border blue value (8 BPP)
#define HP 0x2E // Values range from 1 - 1024 (value written + 1)
#define HBB 0x30
#define HBE 0x32
#define BG 0x58
#define INT1 0xE0
+//NOTE: These arbitrary cutoffs are NOT taken into account for PAL jaguar screens. !!! FIX !!!
+
+// Arbitrary video cutoff values (i.e., first/last visible spots on a TV, in HC ticks)
+/*#define LEFT_VISIBLE_HC 208
+#define RIGHT_VISIBLE_HC 1528//*/
+#define LEFT_VISIBLE_HC 208
+#define RIGHT_VISIBLE_HC 1488
+//#define TOP_VISIBLE_VC 25
+//#define BOTTOM_VISIBLE_VC 503
+#define TOP_VISIBLE_VC 31
+#define BOTTOM_VISIBLE_VC 511
+
+//Are these PAL horizontals correct?
+//They seem to be for the most part, but there are some games that seem to be
+//shifted over to the right from this "window".
+#define LEFT_VISIBLE_HC_PAL 208
+#define RIGHT_VISIBLE_HC_PAL 1488
+#define TOP_VISIBLE_VC_PAL 67
+#define BOTTOM_VISIBLE_VC_PAL 579
+
//This can be defined in the makefile as well...
//(It's easier to do it here, though...)
//#define TOM_DEBUG
-extern uint32 jaguar_mainRom_crc32;
extern uint8 objectp_running;
static uint8 * tom_ram_8;
uint16 tom_jerry_int_pending, tom_timer_int_pending, tom_object_int_pending,
tom_gpu_int_pending, tom_video_int_pending;
uint16 * tom_cry_rgb_mix_lut;
+int16 * TOMBackbuffer;
static char * videoMode_to_str[8] =
{ "16 BPP CRY", "24 BPP RGB", "16 BPP DIRECT", "16 BPP RGB",
render_xxx_scanline_fn * scanline_render[8];
+// Screen info for various games [PAL]...
+/*
+BIOS
+TOM: Horizontal Period written by M68K: 850 (+1*2 = 1702)
+TOM: Horizontal Blank Begin written by M68K: 1711
+TOM: Horizontal Blank End written by M68K: 158
+TOM: Horizontal Display End written by M68K: 1696
+TOM: Horizontal Display Begin 1 written by M68K: 166
+TOM: Vertical Period written by M68K: 623 (non-interlaced)
+TOM: Vertical Blank End written by M68K: 34
+TOM: Vertical Display Begin written by M68K: 46
+TOM: Vertical Display End written by M68K: 526
+TOM: Vertical Blank Begin written by M68K: 600
+TOM: Vertical Sync written by M68K: 618
+TOM: Horizontal Display End written by M68K: 1665
+TOM: Horizontal Display Begin 1 written by M68K: 203
+TOM: Vertical Display Begin written by M68K: 38
+TOM: Vertical Display End written by M68K: 518
+TOM: Video Mode written by M68K: 06C1. PWIDTH = 4, MODE = 16 BPP CRY, flags: BGEN (VC = 151)
+TOM: Horizontal Display End written by M68K: 1713
+TOM: Horizontal Display Begin 1 written by M68K: 157
+TOM: Vertical Display Begin written by M68K: 35
+TOM: Vertical Display End written by M68K: 2047
+Horizontal range: 157 - 1713 (width: 1557 / 4 = 389.25, / 5 = 315.4)
+
+Asteroid
+TOM: Horizontal Period written by M68K: 845 (+1*2 = 1692)
+TOM: Horizontal Blank Begin written by M68K: 1700
+TOM: Horizontal Blank End written by M68K: 122
+TOM: Horizontal Display End written by M68K: 1600
+TOM: Horizontal Display Begin 1 written by M68K: 268
+TOM: Vertical Period written by M68K: 523 (non-interlaced)
+TOM: Vertical Blank End written by M68K: 40
+TOM: Vertical Display Begin written by M68K: 44
+TOM: Vertical Display End written by M68K: 492
+TOM: Vertical Blank Begin written by M68K: 532
+TOM: Vertical Sync written by M68K: 513
+TOM: Video Mode written by M68K: 04C7. PWIDTH = 3, MODE = 16 BPP RGB, flags: BGEN (VC = 461)
+
+Rayman
+TOM: Horizontal Display End written by M68K: 1713
+TOM: Horizontal Display Begin 1 written by M68K: 157
+TOM: Vertical Display Begin written by M68K: 35
+TOM: Vertical Display End written by M68K: 2047
+TOM: Video Mode written by M68K: 06C7. PWIDTH = 4, MODE = 16 BPP RGB, flags: BGEN (VC = 89)
+TOM: Horizontal Display Begin 1 written by M68K: 208
+TOM: Horizontal Display End written by M68K: 1662
+TOM: Vertical Display Begin written by M68K: 100
+TOM: Vertical Display End written by M68K: 2047
+TOM: Video Mode written by M68K: 07C7. PWIDTH = 4, MODE = 16 BPP RGB, flags: BGEN VARMOD (VC = 205)
+Horizontal range: 208 - 1662 (width: 1455 / 4 = 363.5)
+
+Alien vs Predator
+TOM: Vertical Display Begin written by M68K: 96
+TOM: Vertical Display End written by M68K: 2047
+TOM: Horizontal Display Begin 1 written by M68K: 239
+TOM: Horizontal Display End written by M68K: 1692
+TOM: Video Mode written by M68K: 06C1. PWIDTH = 4, MODE = 16 BPP CRY, flags: BGEN (VC = 378)
+TOM: Vertical Display Begin written by M68K: 44
+TOM: Vertical Display End written by M68K: 2047
+TOM: Horizontal Display Begin 1 written by M68K: 239
+TOM: Horizontal Display End written by M68K: 1692
+TOM: Video Mode written by M68K: 06C7. PWIDTH = 4, MODE = 16 BPP RGB, flags: BGEN (VC = 559)
+TOM: Vertical Display Begin written by M68K: 84
+TOM: Vertical Display End written by M68K: 2047
+TOM: Horizontal Display Begin 1 written by M68K: 239
+TOM: Horizontal Display End written by M68K: 1692
+TOM: Vertical Display Begin written by M68K: 44
+TOM: Vertical Display End written by M68K: 2047
+TOM: Horizontal Display Begin 1 written by M68K: 239
+TOM: Horizontal Display End written by M68K: 1692
+Horizontal range: 239 - 1692 (width: 1454 / 4 = 363.5)
+
+*/
+
+// Screen info for various games [NTSC]...
+/*
+Doom
+TOM: Horizontal Display End written by M68K: 1727
+TOM: Horizontal Display Begin 1 written by M68K: 123
+TOM: Vertical Display Begin written by M68K: 25
+TOM: Vertical Display End written by M68K: 2047
+TOM: Video Mode written by M68K: 0EC1. PWIDTH = 8, MODE = 16 BPP CRY, flags: BGEN (VC = 5)
+Also does PWIDTH = 4...
+Vertical resolution: 238 lines
+
+Rayman
+TOM: Horizontal Display End written by M68K: 1727
+TOM: Horizontal Display Begin 1 written by M68K: 123
+TOM: Vertical Display Begin written by M68K: 25
+TOM: Vertical Display End written by M68K: 2047
+TOM: Vertical Interrupt written by M68K: 507
+TOM: Video Mode written by M68K: 06C7. PWIDTH = 4, MODE = 16 BPP RGB, flags: BGEN (VC = 92)
+TOM: Horizontal Display Begin 1 written by M68K: 208
+TOM: Horizontal Display End written by M68K: 1670
+Display starts at 31, then 52!
+Vertical resolution: 238 lines
+
+Atari Karts
+TOM: Horizontal Display End written by M68K: 1727
+TOM: Horizontal Display Begin 1 written by M68K: 123
+TOM: Vertical Display Begin written by M68K: 25
+TOM: Vertical Display End written by M68K: 2047
+TOM: Video Mode written by GPU: 08C7. PWIDTH = 5, MODE = 16 BPP RGB, flags: BGEN (VC = 4)
+TOM: Video Mode written by GPU: 06C7. PWIDTH = 4, MODE = 16 BPP RGB, flags: BGEN (VC = 508)
+Display starts at 31 (PWIDTH = 4), 24 (PWIDTH = 5)
+
+Iron Soldier
+TOM: Vertical Interrupt written by M68K: 2047
+TOM: Video Mode written by M68K: 06C1. PWIDTH = 4, MODE = 16 BPP CRY, flags: BGEN (VC = 0)
+TOM: Horizontal Display End written by M68K: 1727
+TOM: Horizontal Display Begin 1 written by M68K: 123
+TOM: Vertical Display Begin written by M68K: 25
+TOM: Vertical Display End written by M68K: 2047
+TOM: Vertical Interrupt written by M68K: 507
+TOM: Video Mode written by M68K: 06C1. PWIDTH = 4, MODE = 16 BPP CRY, flags: BGEN (VC = 369)
+TOM: Video Mode written by M68K: 06C1. PWIDTH = 4, MODE = 16 BPP CRY, flags: BGEN (VC = 510)
+TOM: Video Mode written by M68K: 06C3. PWIDTH = 4, MODE = 24 BPP RGB, flags: BGEN (VC = 510)
+Display starts at 31
+Vertical resolution: 238 lines
+[Seems to be a problem between the horizontal positioning of the 16-bit CRY & 24-bit RGB]
+
+JagMania
+TOM: Horizontal Period written by M68K: 844 (+1*2 = 1690)
+TOM: Horizontal Blank Begin written by M68K: 1713
+TOM: Horizontal Blank End written by M68K: 125
+TOM: Horizontal Display End written by M68K: 1696
+TOM: Horizontal Display Begin 1 written by M68K: 166
+TOM: Vertical Period written by M68K: 523 (non-interlaced)
+TOM: Vertical Blank End written by M68K: 24
+TOM: Vertical Display Begin written by M68K: 46
+TOM: Vertical Display End written by M68K: 496
+TOM: Vertical Blank Begin written by M68K: 500
+TOM: Vertical Sync written by M68K: 517
+TOM: Vertical Interrupt written by M68K: 497
+TOM: Video Mode written by M68K: 04C1. PWIDTH = 3, MODE = 16 BPP CRY, flags: BGEN (VC = 270)
+Display starts at 55
+
+Double Dragon V
+TOM: Horizontal Display End written by M68K: 1727
+TOM: Horizontal Display Begin 1 written by M68K: 123
+TOM: Vertical Display Begin written by M68K: 25
+TOM: Vertical Display End written by M68K: 2047
+TOM: Vertical Interrupt written by M68K: 507
+TOM: Video Mode written by M68K: 06C7. PWIDTH = 4, MODE = 16 BPP RGB, flags: BGEN (VC = 9)
+
+Dino Dudes
+TOM: Horizontal Display End written by M68K: 1823
+TOM: Horizontal Display Begin 1 written by M68K: 45
+TOM: Vertical Display Begin written by M68K: 40
+TOM: Vertical Display End written by M68K: 2047
+TOM: Vertical Interrupt written by M68K: 491
+TOM: Video Mode written by M68K: 06C1. PWIDTH = 4, MODE = 16 BPP CRY, flags: BGEN (VC = 398)
+Display starts at 11 (123 - 45 = 78, 78 / 4 = 19 pixels to skip)
+Width is 417, so maybe width of 379 would be good (starting at 123, ending at 1639)
+Vertical resolution: 238 lines
+
+Flashback
+TOM: Horizontal Display End written by M68K: 1727
+TOM: Horizontal Display Begin 1 written by M68K: 188
+TOM: Vertical Display Begin written by M68K: 1
+TOM: Vertical Display End written by M68K: 2047
+TOM: Vertical Interrupt written by M68K: 483
+TOM: Video Mode written by M68K: 08C7. PWIDTH = 5, MODE = 16 BPP RGB, flags: BGEN (VC = 99)
+Width would be 303 with above scheme, but border width would be 13 pixels
+
+Trevor McFur
+Vertical resolution: 238 lines
+*/
+
+
void tom_calc_cry_rgb_mix_lut(void)
{
- memory_malloc_secure((void **)&tom_cry_rgb_mix_lut, 2 * 0x10000, "CRY/RGB mixed mode LUT");
-
for (uint32 i=0; i<0x10000; i++)
{
uint16 color = i;
blue = (((uint32)bluecv[chrm][chrl]) * y) >> 11;
color = (red << 10) | (green << 5) | blue;
}
+
tom_cry_rgb_mix_lut[i] = color;
}
}
uint16 width = tom_width;
uint8 * current_line_buffer = (uint8 *)&tom_ram_8[0x1800];
+ //New stuff--restrict our drawing...
+ uint8 pwidth = ((GET16(tom_ram_8, VMODE) & PWIDTH) >> 9) + 1;
+ //NOTE: May have to check HDB2 as well!
+ // Get start position in HC ticks
+ int16 startPos = GET16(tom_ram_8, HDB1) - (vjs.hardwareTypeNTSC ? LEFT_VISIBLE_HC : LEFT_VISIBLE_HC_PAL);
+ startPos /= pwidth;
+ if (startPos < 0)
+ current_line_buffer += 2 * -startPos;
+ else
+//This case doesn't properly handle the "start on the right side of virtual screen" case
+//Dunno why--looks Ok...
+//What *is* for sure wrong is that it doesn't copy the linebuffer's BG pixels...
+ backbuffer += 2 * startPos, width -= startPos;
+
while (width)
{
uint16 color = (*current_line_buffer++) << 8;
uint16 width = tom_width;
uint8 * current_line_buffer = (uint8 *)&tom_ram_8[0x1800];
+ //New stuff--restrict our drawing...
+ uint8 pwidth = ((GET16(tom_ram_8, VMODE) & PWIDTH) >> 9) + 1;
+ //NOTE: May have to check HDB2 as well!
+ int16 startPos = GET16(tom_ram_8, HDB1) - (vjs.hardwareTypeNTSC ? LEFT_VISIBLE_HC : LEFT_VISIBLE_HC_PAL);// Get start position in HC ticks
+ startPos /= pwidth;
+ if (startPos < 0)
+ current_line_buffer += 2 * -startPos;
+ else
+ backbuffer += 2 * startPos, width -= startPos;
+
while (width)
{
uint16 color = (*current_line_buffer++) << 8;
uint16 width = tom_width;
uint8 * current_line_buffer = (uint8 *)&tom_ram_8[0x1800];
+ //New stuff--restrict our drawing...
+ uint8 pwidth = ((GET16(tom_ram_8, VMODE) & PWIDTH) >> 9) + 1;
+ //NOTE: May have to check HDB2 as well!
+ int16 startPos = GET16(tom_ram_8, HDB1) - (vjs.hardwareTypeNTSC ? LEFT_VISIBLE_HC : LEFT_VISIBLE_HC_PAL); // Get start position in HC ticks
+ startPos /= pwidth;
+ if (startPos < 0)
+ current_line_buffer += 4 * -startPos;
+ else
+ backbuffer += 2 * startPos, width -= startPos;
+
while (width)
{
+ // This is NOT a good 8 -> 5 bit RGB conversion! (It saturates values below 8
+ // to zero and throws away almost *half* the color resolution!)
uint16 green = (*current_line_buffer++) >> 3;
uint16 red = (*current_line_buffer++) >> 3;
current_line_buffer++;
uint16 width = tom_width;
uint8 * current_line_buffer = (uint8 *)&tom_ram_8[0x1800];
+ //New stuff--restrict our drawing...
+ uint8 pwidth = ((GET16(tom_ram_8, VMODE) & PWIDTH) >> 9) + 1;
+ //NOTE: May have to check HDB2 as well!
+ int16 startPos = GET16(tom_ram_8, HDB1) - (vjs.hardwareTypeNTSC ? LEFT_VISIBLE_HC : LEFT_VISIBLE_HC_PAL); // Get start position in HC ticks
+ startPos /= pwidth;
+ if (startPos < 0)
+ current_line_buffer += 2 * -startPos;
+ else
+ backbuffer += 2 * startPos, width -= startPos;
+
while (width)
{
uint16 color = (*current_line_buffer++) << 8;
}
}
+void TOMResetBackbuffer(int16 * backbuffer)
+{
+ TOMBackbuffer = backbuffer;
+}
+
//
// Process a single scanline
//
-void tom_exec_scanline(int16 * backbuffer, int32 scanline, bool render)
+void TOMExecScanline(uint16 scanline, bool render)
{
- if (render)
+ bool inActiveDisplayArea = true;
+
+//Interlacing is still not handled correctly here... !!! FIX !!!
+ if (scanline & 0x01) // Execute OP only on even lines (non-interlaced only!)
+ return;
+
+ if (scanline >= (uint16)GET16(tom_ram_8, VDB) && scanline < (uint16)GET16(tom_ram_8, VDE))
{
- uint8 * current_line_buffer = (uint8 *)&tom_ram_8[0x1800];
- uint8 bgHI = tom_ram_8[BG], bgLO = tom_ram_8[BG + 1];
+ if (render)
+ {
+ uint8 * current_line_buffer = (uint8 *)&tom_ram_8[0x1800];
+ uint8 bgHI = tom_ram_8[BG], bgLO = tom_ram_8[BG + 1];
- // Clear line buffer with BG
- if (GET16(tom_ram_8, VMODE) & BGEN) // && (CRY or RGB16)...
- for(uint32 i=0; i<720; i++)
- *current_line_buffer++ = bgHI, *current_line_buffer++ = bgLO;
+ // Clear line buffer with BG
+ if (GET16(tom_ram_8, VMODE) & BGEN) // && (CRY or RGB16)...
+ for(uint32 i=0; i<720; i++)
+ *current_line_buffer++ = bgHI, *current_line_buffer++ = bgLO;
- OPProcessList(scanline, render);
- scanline_render[tom_getVideoMode()](backbuffer);
+ OPProcessList(scanline, render);
+ }
}
-}
+ else
+ inActiveDisplayArea = false;
-uint32 TOMGetSDLScreenPitch(void)
-{
- extern SDL_Surface * surface;
+//Try to take PAL into account...
+uint16 topVisible = (vjs.hardwareTypeNTSC ? TOP_VISIBLE_VC : TOP_VISIBLE_VC_PAL),
+ bottomVisible = (vjs.hardwareTypeNTSC ? BOTTOM_VISIBLE_VC : BOTTOM_VISIBLE_VC_PAL);
+ // Here's our virtualized scanline code...
+ if (scanline >= topVisible && scanline < bottomVisible)
+ {
+ if (inActiveDisplayArea)
+ scanline_render[tom_getVideoMode()](TOMBackbuffer);
+ else
+ {
+ // If outside of VDB & VDE, then display the border color
+ int16 * currentLineBuffer = TOMBackbuffer;
+ uint8 g = tom_ram_8[BORD1], r = tom_ram_8[BORD1 + 1], b = tom_ram_8[BORD2 + 1];
+ uint16 pixel = ((r & 0xF8) << 7) | ((g & 0xF8) << 2) | (b >> 3);
- return surface->pitch;
+ for(uint32 i=0; i<tom_width; i++)
+ *currentLineBuffer++ = pixel;
+ }
+
+ TOMBackbuffer += GetSDLScreenPitch() / 2; // Returns bytes, but we need words
+ }
}
//
//
void tom_init(void)
{
+ memory_malloc_secure((void **)&tom_cry_rgb_mix_lut, 2 * 0x10000, "CRY/RGB mixed mode LUT");
+
op_init();
blitter_init();
//This should be done by JERRY! pcm_init();
// gpu_done();
// dsp_done();
memory_free(tom_ram_8);
+ memory_free(tom_cry_rgb_mix_lut);
}
/*uint32 tom_getHBlankWidthInPixels(void)
// return width[(GET16(tom_ram_8, VMODE) & PWIDTH) >> 9];
// Now, we just calculate it...
- uint16 hdb1 = GET16(tom_ram_8, HDB1), hde = GET16(tom_ram_8, HDE),
+/* uint16 hdb1 = GET16(tom_ram_8, HDB1), hde = GET16(tom_ram_8, HDE),
hbb = GET16(tom_ram_8, HBB), pwidth = ((GET16(tom_ram_8, VMODE) & PWIDTH) >> 9) + 1;
// return ((hbb < hde ? hbb : hde) - hdb1) / pwidth;
//Temporary, for testing Doom...
- return ((hbb < hde ? hbb : hde) - hdb1) / (pwidth = 8 ? 4 : pwidth);
+ return ((hbb < hde ? hbb : hde) - hdb1) / (pwidth == 8 ? 4 : pwidth);*/
+
+ // To make it easier to make a quasi-fixed display size, we restrict the viewing
+ // area to an arbitrary range of the Horizontal Count.
+ uint16 pwidth = ((GET16(tom_ram_8, VMODE) & PWIDTH) >> 9) + 1;
+ return (vjs.hardwareTypeNTSC ? RIGHT_VISIBLE_HC - LEFT_VISIBLE_HC : RIGHT_VISIBLE_HC_PAL - LEFT_VISIBLE_HC_PAL) / pwidth;
+//Temporary, for testing Doom...
+// return (RIGHT_VISIBLE_HC - LEFT_VISIBLE_HC) / (pwidth == 8 ? 4 : pwidth);
+//// return (RIGHT_VISIBLE_HC - LEFT_VISIBLE_HC) / (pwidth == 4 ? 8 : pwidth);
// More speculating...
// According to the JTRM, the number of potential pixels across is given by the
// which to measure HBB & HDB1/2 against when rendering LBUF (i.e., if HDB1 is 20 ticks
// to the right of the ALDL and PWIDTH is 4, then start writing the LBUF starting at
// backbuffer + 5 pixels).
+
+// That's basically what we're doing now...!
}
// *** SPECULATION ***
// It might work better to virtualize the height settings, i.e., set the vertical
// height at 240 lines and clip using the VDB and VDE/VP registers...
-// Same with the width...
+// Same with the width... [Width is pretty much virtualized now.]
+// Now that that the width is virtualized, let's virtualize the height. :-)
uint32 tom_getVideoModeHeight(void)
{
// uint16 vmode = GET16(tom_ram_8, VMODE);
- uint16 vbe = GET16(tom_ram_8, VBE);
- uint16 vbb = GET16(tom_ram_8, VBB);
+// uint16 vbe = GET16(tom_ram_8, VBE);
+// uint16 vbb = GET16(tom_ram_8, VBB);
// uint16 vdb = GET16(tom_ram_8, VDB);
// uint16 vde = GET16(tom_ram_8, VDE);
// uint16 vp = GET16(tom_ram_8, VP);
// return ((vde > vbb ? vbb : vde) - vdb) >> 1;
//Let's try from the Vertical Blank interval...
//Seems to work OK!
- return (vbb - vbe) >> 1; // Again, doesn't take interlacing into account...
+// return (vbb - vbe) >> 1; // Again, doesn't take interlacing into account...
+// This of course doesn't take interlacing into account. But I haven't seen any
+// Jaguar software that takes advantage of it either...
+//Also, doesn't reflect PAL Jaguar either... !!! FIX !!! [DONE]
+// return 240; // Set virtual screen height to 240 lines...
+ return (vjs.hardwareTypeNTSC ? 240 : 256);
}
//
//
void tom_reset(void)
{
- extern bool hardwareTypeNTSC;
-
op_reset();
blitter_reset();
//This should be done by JERRY! pcm_reset();
memset(tom_ram_8, 0x00, 0x4000);
- if (hardwareTypeNTSC)
+ if (vjs.hardwareTypeNTSC)
{
SET16(tom_ram_8, MEMCON1, 0x1861);
SET16(tom_ram_8, MEMCON2, 0x35CC);
tom_width = tom_real_internal_width = 0;
tom_height = 0;
-// tom_scanline = 0;
-
-//This is WRONG
-// hblankWidthInPixels = GET16(tom_ram_8, HDB1) >> 1;
tom_jerry_int_pending = 0;
tom_timer_int_pending = 0;
tom_gpu_int_pending = 0;
tom_video_int_pending = 0;
- tom_timer_prescaler = 0;
+ tom_timer_prescaler = 0; // TOM PIT is disabled
tom_timer_divider = 0;
tom_timer_counter = 0;
memcpy(scanline_render, scanline_render_normal, sizeof(scanline_render));
else if (offset == 0xF00050)
{
tom_timer_prescaler = (tom_timer_prescaler & 0x00FF) | (data << 8);
- tom_reset_timer();
+ TOMResetPIT();
return;
}
else if (offset == 0xF00051)
{
tom_timer_prescaler = (tom_timer_prescaler & 0xFF00) | data;
- tom_reset_timer();
+ TOMResetPIT();
return;
}
else if (offset == 0xF00052)
{
tom_timer_divider = (tom_timer_divider & 0x00FF) | (data << 8);
- tom_reset_timer();
+ TOMResetPIT();
return;
}
else if (offset == 0xF00053)
{
tom_timer_divider = (tom_timer_divider & 0xFF00) | data;
- tom_reset_timer();
+ TOMResetPIT();
return;
}
else if (offset >= 0xF00400 && offset <= 0xF007FF) // CLUT (A & B)
else if (offset == 0xF00050)
{
tom_timer_prescaler = data;
- tom_reset_timer();
+ TOMResetPIT();
return;
}
else if (offset == 0xF00052)
{
tom_timer_divider = data;
- tom_reset_timer();
+ TOMResetPIT();
return;
}
else if (offset == 0xF000E0)
WriteLog("TOM: Horizontal Blank End written by %s: %u\n", whoName[who], data);
if (offset == VMODE)
WriteLog("TOM: Video Mode written by %s: %04X. PWIDTH = %u, MODE = %s, flags:%s%s (VC = %u)\n", whoName[who], data, ((data >> 9) & 0x07) + 1, videoMode_to_str[(data & MODE) >> 1], (data & BGEN ? " BGEN" : ""), (data & VARMOD ? " VARMOD" : ""), GET16(tom_ram_8, VC));
-/*#define MODE 0x0006 // Line buffer to video generator mode
-#define BGEN 0x0080 // Background enable (CRY & RGB16 only)
-#define VARMOD 0x0100 // Mixed CRY/RGB16 mode
-#define PWIDTH 0x0E00 // Pixel width in video clock cycles (value written + 1)*/
// detect screen resolution changes
//This may go away in the future, if we do the virtualized screen thing...
+//This may go away soon!
if ((offset >= 0x28) && (offset <= 0x4F))
{
uint32 width = tom_getVideoModeWidth(), height = tom_getVideoModeHeight();
tom_real_internal_width = width;
-//This looks like an attempt to render non-square pixels (though wrong...)
-/* if (width == 640)
- {
- memcpy(scanline_render, scanline_render_stretch, sizeof(scanline_render));
- width = 320;
- }
- else
- memcpy(scanline_render, scanline_render_normal, sizeof(scanline_render));//*/
-
if ((width != tom_width) || (height != tom_height))
{
- extern SDL_Surface * surface, * mainSurface;
- extern Uint32 mainSurfaceFlags;
- static char window_title[256];
-
tom_width = width, tom_height = height;
- SDL_FreeSurface(surface);
- surface = SDL_CreateRGBSurface(SDL_SWSURFACE, tom_width, tom_height,
- 16, 0x7C00, 0x03E0, 0x001F, 0);
- if (surface == NULL)
- {
- WriteLog("TOM: Could not create primary SDL surface: %s", SDL_GetError());
- exit(1);
- }
-
- sprintf(window_title, "Virtual Jaguar (%i x %i)", (int)tom_width, (int)tom_height);
-//???Should we do this??? No!
-// SDL_FreeSurface(mainSurface);
- mainSurface = SDL_SetVideoMode(tom_width, tom_height, 16, mainSurfaceFlags);
-
- if (mainSurface == NULL)
- {
- WriteLog("Joystick: SDL is unable to set the video mode: %s\n", SDL_GetError());
- exit(1);
- }
-
- SDL_WM_SetCaption(window_title, window_title);
+ ResizeScreen(tom_width, tom_height);
}
}
}
return (tom_ram_8[0xE0] << 8) | tom_ram_8[0xE1];
}*/
-void tom_reset_timer(void)
+void TOMResetPIT(void)
{
- if (!tom_timer_prescaler || !tom_timer_divider)
- tom_timer_counter = 0;
- else
-//Probably should *add* this amount to the counter to retain cycle accuracy! !!! FIX !!!
-//Also, why +1???
- tom_timer_counter = (1 + tom_timer_prescaler) * (1 + tom_timer_divider);
+//Probably should *add* this amount to the counter to retain cycle accuracy! !!! FIX !!! [DONE]
+//Also, why +1??? 'Cause that's what it says in the JTRM...!
+//There is a small problem with this approach: If both the prescaler and the divider are equal
+//to $FFFF then the counter won't be large enough to handle it. !!! FIX !!!
+ if (tom_timer_prescaler)
+ tom_timer_counter += (1 + tom_timer_prescaler) * (1 + tom_timer_divider);
// WriteLog("tom: reseting timer to 0x%.8x (%i)\n",tom_timer_counter,tom_timer_counter);
}
//
// TOM Programmable Interrupt Timer handler
+// NOTE: TOM's PIT is only enabled if the prescaler is != 0
//
-void tom_pit_exec(uint32 cycles)
+void TOMExecPIT(uint32 cycles)
{
- if (tom_timer_counter > 0)
+ if (tom_timer_prescaler)
{
tom_timer_counter -= cycles;
if (tom_timer_counter <= 0)
{
tom_set_pending_timer_int();
- GPUSetIRQLine(GPUIRQ_TIMER, ASSERT_LINE);
- if (tom_irq_enabled(IRQ_TIMER) && jaguar_interrupt_handler_is_valid(64))
- m68k_set_irq(7); // Cause a 68000 NMI...
+ GPUSetIRQLine(GPUIRQ_TIMER, ASSERT_LINE); // GPUSetIRQLine does the 'IRQ enabled' checking
+ if (tom_irq_enabled(IRQ_TIMER))//get rid of this crap -> && jaguar_interrupt_handler_is_valid(64))
+ m68k_set_irq(7); // Cause a 68000 NMI...
- tom_reset_timer();
+ TOMResetPIT();
}
}
}
projects / virtualjaguar / blobdiff