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