mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 15:27:46 -04:00
458 lines
11 KiB
C
458 lines
11 KiB
C
// This is a direct rewrite of gfx_cd.asm (x86 asm to C).
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// You can even find some x86 register names :)
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// Original code (c) 2002 by Stéphane Dallongeville
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// (c) Copyright 2007, Grazvydas "notaz" Ignotas
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#include "../pico_int.h"
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#undef dprintf
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#define dprintf(...)
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#define UPDATE_CYCLES 20000
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#define _rot_comp Pico_mcd->rot_comp
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static void gfx_do_line(unsigned int func, unsigned short *stamp_base,
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unsigned int H_Dot);
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static void gfx_cd_start(void)
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{
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int w, h, cycles;
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int y_step;
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w = _rot_comp.Reg_62;
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h = _rot_comp.Reg_64;
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if (w == 0 || h == 0) {
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elprintf(EL_CD|EL_ANOMALY, "gfx_cd_start with %ux%u", w, h);
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_rot_comp.Reg_64 = 0;
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// irq?
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return;
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}
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// _rot_comp.XD_Mul = ((_rot_comp.Reg_5C & 0x1f) + 1) * 4; // unused
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_rot_comp.Function = (_rot_comp.Reg_58 & 7) | (Pico_mcd->s68k_regs[3] & 0x18); // Jmp_Adr
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// _rot_comp.Buffer_Adr = (_rot_comp.Reg_5E & 0xfff8) << 2; // unused?
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_rot_comp.YD = (_rot_comp.Reg_60 >> 3) & 7;
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_rot_comp.Vector_Adr = (_rot_comp.Reg_66 & 0xfffe) << 2;
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switch (_rot_comp.Reg_58 & 6) // Scr_16?
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{
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case 0: // ?
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_rot_comp.Stamp_Map_Adr = (_rot_comp.Reg_5A & 0xff80) << 2;
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break;
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case 2: // .Dot_32
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_rot_comp.Stamp_Map_Adr = (_rot_comp.Reg_5A & 0xffe0) << 2;
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break;
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case 4: // .Scr_16
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_rot_comp.Stamp_Map_Adr = 0x20000;
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break;
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case 6: // .Scr_16_Dot_32
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_rot_comp.Stamp_Map_Adr = (_rot_comp.Reg_5A & 0xe000) << 2;
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break;
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}
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_rot_comp.Reg_58 |= 0x8000; // Stamp_Size, we start a new GFX operation
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cycles = 5 * w * h;
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if (cycles > UPDATE_CYCLES)
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y_step = (UPDATE_CYCLES + 5 * w - 1) / (5 * w);
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else
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y_step = h;
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_rot_comp.y_step = y_step;
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pcd_event_schedule_s68k(PCD_EVENT_GFX, 5 * w * y_step);
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}
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void gfx_cd_update(unsigned int cycles)
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{
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int w = _rot_comp.Reg_62;
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int h, next;
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if (!(Pico_mcd->rot_comp.Reg_58 & 0x8000))
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return;
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h = _rot_comp.Reg_64;
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_rot_comp.Reg_64 -= _rot_comp.y_step;
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if ((int)_rot_comp.Reg_64 <= 0) {
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Pico_mcd->rot_comp.Reg_58 &= 0x7fff;
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Pico_mcd->rot_comp.Reg_64 = 0;
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if (Pico_mcd->s68k_regs[0x33] & PCDS_IEN1) {
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elprintf(EL_INTS |EL_CD, "s68k: gfx_cd irq 1");
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SekInterruptS68k(1);
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}
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}
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else {
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next = _rot_comp.Reg_64;
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if (next > _rot_comp.y_step)
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next = _rot_comp.y_step;
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pcd_event_schedule(cycles, PCD_EVENT_GFX, 5 * w * next);
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h = _rot_comp.y_step;
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}
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if (PicoOpt & POPT_EN_MCD_GFX)
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{
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unsigned int func = _rot_comp.Function;
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unsigned short *stamp_base = (unsigned short *)
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(Pico_mcd->word_ram2M + _rot_comp.Stamp_Map_Adr);
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while (h--)
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gfx_do_line(func, stamp_base, w);
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}
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}
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PICO_INTERNAL_ASM unsigned int gfx_cd_read(unsigned int a)
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{
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unsigned int d = 0;
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switch (a) {
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case 0x58: d = _rot_comp.Reg_58; break;
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case 0x5A: d = _rot_comp.Reg_5A; break;
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case 0x5C: d = _rot_comp.Reg_5C; break;
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case 0x5E: d = _rot_comp.Reg_5E; break;
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case 0x60: d = _rot_comp.Reg_60; break;
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case 0x62: d = _rot_comp.Reg_62; break;
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case 0x64: d = _rot_comp.Reg_64; break;
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case 0x66: break;
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default: dprintf("gfx_cd_read FIXME: unexpected address: %02x", a); break;
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}
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dprintf("gfx_cd_read(%02x) = %04x", a, d);
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return d;
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}
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static void gfx_do_line(unsigned int func, unsigned short *stamp_base,
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unsigned int H_Dot)
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{
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unsigned int eax, ebx, ecx, edx, esi, edi, pixel;
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unsigned int XD, Buffer_Adr;
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int DYXS;
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XD = _rot_comp.Reg_60 & 7;
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Buffer_Adr = ((_rot_comp.Reg_5E & 0xfff8) + _rot_comp.YD) << 2;
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ecx = *(unsigned int *)(Pico_mcd->word_ram2M + _rot_comp.Vector_Adr);
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edx = ecx >> 16;
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ecx = (ecx & 0xffff) << 8;
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edx <<= 8;
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DYXS = *(int *)(Pico_mcd->word_ram2M + _rot_comp.Vector_Adr + 4);
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_rot_comp.Vector_Adr += 8;
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// MAKE_IMAGE_LINE
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while (H_Dot)
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{
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// MAKE_IMAGE_PIXEL
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if (!(func & 1)) // NOT TILED
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{
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int mask = (func & 4) ? 0x00800000 : 0x00f80000;
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if ((ecx | edx) & mask)
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{
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if (func & 0x18) goto Next_Pixel;
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pixel = 0;
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goto Pixel_Out;
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}
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}
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if (func & 2) // mode 32x32 dot
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{
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if (func & 4) // 16x16 screen
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{
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ebx = ((ecx >> (11+5)) & 0x007f) |
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((edx >> (11-2)) & 0x3f80);
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}
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else // 1x1 screen
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{
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ebx = ((ecx >> (11+5)) & 0x07) |
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((edx >> (11+2)) & 0x38);
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}
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}
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else // mode 16x16 dot
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{
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if (func & 4) // 16x16 screen
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{
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ebx = ((ecx >> (11+4)) & 0x00ff) |
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((edx >> (11-4)) & 0xff00);
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}
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else // 1x1 screen
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{
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ebx = ((ecx >> (11+4)) & 0x0f) |
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((edx >> (11+0)) & 0xf0);
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}
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}
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edi = stamp_base[ebx];
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esi = (edi & 0x7ff) << 7;
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if (!esi) { pixel = 0; goto Pixel_Out; }
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edi >>= (11+1);
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edi &= (0x1c>>1);
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eax = ecx;
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ebx = edx;
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if (func & 2) edi |= 1; // 32 dots?
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switch (edi)
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{
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case 0x00: // No_Flip_0, 16x16 dots
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ebx = (ebx >> 9) & 0x3c;
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ebx += esi;
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edi = (eax & 0x3800) ^ 0x1000; // bswap
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eax = ((eax >> 8) & 0x40) + ebx;
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break;
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case 0x01: // No_Flip_0, 32x32 dots
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ebx = (ebx >> 9) & 0x7c;
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ebx += esi;
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edi = (eax & 0x3800) ^ 0x1000; // bswap
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eax = ((eax >> 7) & 0x180) + ebx;
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break;
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case 0x02: // No_Flip_90, 16x16 dots
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eax = (eax >> 9) & 0x3c;
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eax += esi;
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edi = (ebx & 0x3800) ^ 0x2800; // bswap
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eax += ((ebx >> 8) & 0x40) ^ 0x40;
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break;
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case 0x03: // No_Flip_90, 32x32 dots
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eax = (eax >> 9) & 0x7c;
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eax += esi;
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edi = (ebx & 0x3800) ^ 0x2800; // bswap
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eax += ((ebx >> 7) & 0x180) ^ 0x180;
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break;
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case 0x04: // No_Flip_180, 16x16 dots
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ebx = ((ebx >> 9) & 0x3c) ^ 0x3c;
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ebx += esi;
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edi = (eax & 0x3800) ^ 0x2800; // bswap and flip
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eax = (((eax >> 8) & 0x40) ^ 0x40) + ebx;
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break;
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case 0x05: // No_Flip_180, 32x32 dots
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ebx = ((ebx >> 9) & 0x7c) ^ 0x7c;
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ebx += esi;
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edi = (eax & 0x3800) ^ 0x2800; // bswap and flip
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eax = (((eax >> 7) & 0x180) ^ 0x180) + ebx;
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break;
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case 0x06: // No_Flip_270, 16x16 dots
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eax = ((eax >> 9) & 0x3c) ^ 0x3c;
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eax += esi;
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edi = (ebx & 0x3800) ^ 0x1000; // bswap
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eax += (ebx >> 8) & 0x40;
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break;
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case 0x07: // No_Flip_270, 32x32 dots
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eax = ((eax >> 9) & 0x7c) ^ 0x7c;
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eax += esi;
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edi = (ebx & 0x3800) ^ 0x1000; // bswap
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eax += (ebx >> 7) & 0x180;
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break;
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case 0x08: // Flip_0, 16x16 dots
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ebx = (ebx >> 9) & 0x3c;
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ebx += esi;
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edi = (eax & 0x3800) ^ 0x2800; // bswap, flip
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eax = (((eax >> 8) & 0x40) ^ 0x40) + ebx;
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break;
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case 0x09: // Flip_0, 32x32 dots
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ebx = (ebx >> 9) & 0x7c;
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ebx += esi;
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edi = (eax & 0x3800) ^ 0x2800; // bswap, flip
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eax = (((eax >> 7) & 0x180) ^ 0x180) + ebx;
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break;
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case 0x0a: // Flip_90, 16x16 dots
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eax = ((eax >> 9) & 0x3c) ^ 0x3c;
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eax += esi;
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edi = (ebx & 0x3800) ^ 0x2800; // bswap, flip
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eax += ((ebx >> 8) & 0x40) ^ 0x40;
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break;
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case 0x0b: // Flip_90, 32x32 dots
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eax = ((eax >> 9) & 0x7c) ^ 0x7c;
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eax += esi;
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edi = (ebx & 0x3800) ^ 0x2800; // bswap, flip
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eax += ((ebx >> 7) & 0x180) ^ 0x180;
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break;
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case 0x0c: // Flip_180, 16x16 dots
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ebx = ((ebx >> 9) & 0x3c) ^ 0x3c;
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ebx += esi;
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edi = (eax & 0x3800) ^ 0x1000; // bswap
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eax = ((eax >> 8) & 0x40) + ebx;
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break;
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case 0x0d: // Flip_180, 32x32 dots
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ebx = ((ebx >> 9) & 0x7c) ^ 0x7c;
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ebx += esi;
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edi = (eax & 0x3800) ^ 0x1000; // bswap
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eax = ((eax >> 7) & 0x180) + ebx;
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break;
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case 0x0e: // Flip_270, 16x16 dots
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eax = (eax >> 9) & 0x3c;
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eax += esi;
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edi = (ebx & 0x3800) ^ 0x1000; // bswap, flip
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eax += (ebx >> 8) & 0x40;
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break;
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case 0x0f: // Flip_270, 32x32 dots
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eax = (eax >> 9) & 0x7c;
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eax += esi;
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edi = (ebx & 0x3800) ^ 0x1000; // bswap, flip
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eax += (ebx >> 7) & 0x180;
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break;
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}
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pixel = *(Pico_mcd->word_ram2M + (edi >> 12) + eax);
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if (!(edi & 0x800)) pixel >>= 4;
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else pixel &= 0x0f;
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Pixel_Out:
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if (!pixel && (func & 0x18)) goto Next_Pixel;
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esi = Buffer_Adr + ((XD>>1)^1); // pixel addr
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eax = *(Pico_mcd->word_ram2M + esi); // old pixel
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if (XD & 1)
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{
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if ((eax & 0x0f) && (func & 0x18) == 0x08) goto Next_Pixel; // underwrite
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*(Pico_mcd->word_ram2M + esi) = pixel | (eax & 0xf0);
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}
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else
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{
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if ((eax & 0xf0) && (func & 0x18) == 0x08) goto Next_Pixel; // underwrite
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*(Pico_mcd->word_ram2M + esi) = (pixel << 4) | (eax & 0xf);
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}
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Next_Pixel:
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ecx += (DYXS << 16) >> 16; // _rot_comp.DXS;
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edx += DYXS >> 16; // _rot_comp.DYS;
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XD++;
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if (XD >= 8)
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{
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Buffer_Adr += ((_rot_comp.Reg_5C & 0x1f) + 1) << 5;
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XD = 0;
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}
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H_Dot--;
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}
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// end while
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// nothing_to_draw:
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_rot_comp.YD++;
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// _rot_comp.V_Dot--; // will be done by caller
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}
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PICO_INTERNAL_ASM void gfx_cd_write16(unsigned int a, unsigned int d)
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{
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dprintf("gfx_cd_write16(%x, %04x)", a, d);
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if (_rot_comp.Reg_58 & 0x8000)
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elprintf(EL_CD|EL_ANOMALY, "cd: busy gfx reg write %02x %04x", a, d);
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switch (a) {
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case 0x58: // .Reg_Stamp_Size
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_rot_comp.Reg_58 = d & 7;
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return;
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case 0x5A: // .Reg_Stamp_Adr
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_rot_comp.Reg_5A = d & 0xffe0;
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return;
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case 0x5C: // .Reg_IM_VCell_Size
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_rot_comp.Reg_5C = d & 0x1f;
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return;
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case 0x5E: // .Reg_IM_Adr
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_rot_comp.Reg_5E = d & 0xFFF8;
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return;
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case 0x60: // .Reg_IM_Offset
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_rot_comp.Reg_60 = d & 0x3f;
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return;
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case 0x62: // .Reg_IM_HDot_Size
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_rot_comp.Reg_62 = d & 0x1ff;
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return;
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case 0x64: // .Reg_IM_VDot_Size
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_rot_comp.Reg_64 = d & 0xff; // V_Dot, must be 32bit?
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return;
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case 0x66: // .Reg_Vector_Adr
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_rot_comp.Reg_66 = d & 0xfffe;
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if (Pico_mcd->s68k_regs[3]&4) return; // can't do tanformations in 1M mode
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gfx_cd_start();
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return;
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default: dprintf("gfx_cd_write16 FIXME: unexpected address: %02x", a); return;
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}
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}
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PICO_INTERNAL void gfx_cd_reset(void)
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{
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memset(&_rot_comp.Reg_58, 0, sizeof(_rot_comp));
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}
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// --------------------------------
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#include "cell_map.c"
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#ifndef UTYPES_DEFINED
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typedef unsigned short u16;
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#endif
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// check: Heart of the alien, jaguar xj 220
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PICO_INTERNAL void DmaSlowCell(unsigned int source, unsigned int a, int len, unsigned char inc)
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{
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unsigned char *base;
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unsigned int asrc, a2;
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u16 *r;
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base = Pico_mcd->word_ram1M[Pico_mcd->s68k_regs[3]&1];
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switch (Pico.video.type)
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{
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case 1: // vram
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r = Pico.vram;
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for(; len; len--)
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{
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asrc = cell_map(source >> 2) << 2;
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asrc |= source & 2;
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// if(a&1) d=(d<<8)|(d>>8); // ??
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r[a>>1] = *(u16 *)(base + asrc);
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source += 2;
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// AutoIncrement
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a=(u16)(a+inc);
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}
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rendstatus |= PDRAW_SPRITES_MOVED;
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break;
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case 3: // cram
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Pico.m.dirtyPal = 1;
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r = Pico.cram;
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for(a2=a&0x7f; len; len--)
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{
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asrc = cell_map(source >> 2) << 2;
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asrc |= source & 2;
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r[a2>>1] = *(u16 *)(base + asrc);
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source += 2;
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// AutoIncrement
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a2+=inc;
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// good dest?
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if(a2 >= 0x80) break;
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}
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a=(a&0xff00)|a2;
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break;
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case 5: // vsram[a&0x003f]=d;
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r = Pico.vsram;
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for(a2=a&0x7f; len; len--)
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{
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asrc = cell_map(source >> 2) << 2;
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asrc |= source & 2;
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r[a2>>1] = *(u16 *)(base + asrc);
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source += 2;
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// AutoIncrement
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a2+=inc;
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// good dest?
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if(a2 >= 0x80) break;
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}
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a=(a&0xff00)|a2;
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break;
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}
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// remember addr
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Pico.video.addr=(u16)a;
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}
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