-// TODO...
+// 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
-// #include <string.h>
-#include "../PicoInt.h"
+// (c) Copyright 2007, Grazvydas "notaz" Ignotas
-#define rot_comp Pico_mcd->rot_comp
+
+#include "../pico_int.h"
+
+#define _rot_comp Pico_mcd->rot_comp
static const int Table_Rot_Time[] =
{
{
int upd_len;
- dprintf("gfx_cd_start()");
+ // _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;
- rot_comp.XD_Mul = ((rot_comp.Reg_5C & 0x1f) + 1) * 4;
- 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;
- rot_comp.YD = (rot_comp.Reg_60 >> 3) & 7;
- rot_comp.Vector_Adr = (rot_comp.Reg_66 & 0xfffe) << 2;
-
- upd_len = (rot_comp.Reg_62 >> 3) & 0x3f;
+ upd_len = (_rot_comp.Reg_62 >> 3) & 0x3f;
upd_len = Table_Rot_Time[upd_len];
- rot_comp.Draw_Speed = rot_comp.Float_Part = upd_len;
+ _rot_comp.Draw_Speed = _rot_comp.Float_Part = upd_len;
- rot_comp.Reg_58 |= 0x8000; // Stamp_Size, we start a new GFX operation
+ _rot_comp.Reg_58 |= 0x8000; // Stamp_Size, we start a new GFX operation
- switch (rot_comp.Reg_58 & 6) // Scr_16?
+ switch (_rot_comp.Reg_58 & 6) // Scr_16?
{
case 0: // ?
- rot_comp.Stamp_Map_Adr = (rot_comp.Reg_5A & 0xff80) << 2;
+ _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;
+ _rot_comp.Stamp_Map_Adr = (_rot_comp.Reg_5A & 0xffe0) << 2;
break;
case 4: // .Scr_16
- rot_comp.Stamp_Map_Adr = 0x20000;
+ _rot_comp.Stamp_Map_Adr = 0x20000;
break;
case 6: // .Scr_16_Dot_32
- rot_comp.Stamp_Map_Adr = (rot_comp.Reg_5A & 0xe000) << 2;
+ _rot_comp.Stamp_Map_Adr = (_rot_comp.Reg_5A & 0xe000) << 2;
break;
}
+ dprintf("gfx_cd_start, stamp_map_addr=%06x", _rot_comp.Stamp_Map_Adr);
+
gfx_cd_update();
}
static void gfx_completed(void)
{
- rot_comp.Reg_58 &= 0x7fff; // Stamp_Size
- rot_comp.Reg_64 = 0;
+ _rot_comp.Reg_58 &= 0x7fff; // Stamp_Size
+ _rot_comp.Reg_64 = 0;
if (Pico_mcd->s68k_regs[0x33] & (1<<1))
{
- dprintf("gfx_cd irq 1");
+ elprintf(EL_INTS, "gfx_cd irq 1");
SekInterruptS68k(1);
}
}
-static void gfx_do(void)
+static void gfx_do(unsigned int func, unsigned short *stamp_base, unsigned int H_Dot)
{
- unsigned int eax, ebx, ecx, edx, esi, edi, pixel = 0;
- unsigned int func = rot_comp.Function;
- unsigned short *ptrs;
-
- rot_comp.XD = rot_comp.Reg_60 & 7;
- rot_comp.Buffer_Adr = ((rot_comp.Reg_5E & 0xfff8) + rot_comp.YD) << 2;
- rot_comp.H_Dot = rot_comp.Reg_62 & 0x1ff;
- ecx = *(unsigned int *)(Pico_mcd->word_ram2M + rot_comp.Vector_Adr);
+ 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;
- rot_comp.DXS = *(int *)(Pico_mcd->word_ram2M + rot_comp.Vector_Adr + 4);
- rot_comp.DYS = rot_comp.DXS >> 16;
- rot_comp.DXS = (rot_comp.DXS << 16) >> 16; // sign extend
- rot_comp.Vector_Adr += 8;
+ DYXS = *(int *)(Pico_mcd->word_ram2M + _rot_comp.Vector_Adr + 4);
+ _rot_comp.Vector_Adr += 8;
// MAKE_IMAGE_LINE
- while (rot_comp.H_Dot)
+ while (H_Dot)
{
- if (func & 2) // mode 32x32 dot
+ // MAKE_IMAGE_PIXEL
+ if (!(func & 1)) // NOT TILED
{
- if (func & 4) // 16x16 screen
+ int mask = (func & 4) ? 0x00800000 : 0x00f80000;
+ if ((ecx | edx) & mask)
{
- eax = (ecx >> (11+5)) & 0x007f;
- ebx = (edx >> (11-2)) & 0x3f80;
- }
- else // 1x1 screen
- {
- eax = (ecx >> (11+5)) & 0x07;
- ebx = (edx >> (11+2)) & 0x38;
+ if (func & 0x18) goto Next_Pixel;
+ pixel = 0;
+ goto Pixel_Out;
}
}
- else // mode 16x16 dot
+
+ if (func & 2) // mode 32x32 dot
{
if (func & 4) // 16x16 screen
{
- eax = (ecx >> (11+4)) & 0x00ff;
- ebx = (edx >> (11-4)) & 0xff00;
+ ebx = ((ecx >> (11+5)) & 0x007f) |
+ ((edx >> (11-2)) & 0x3f80);
}
else // 1x1 screen
{
- eax = (ecx >> (11+4)) & 0x0f;
- ebx = (edx >> (11+0)) & 0xf0;
+ ebx = ((ecx >> (11+5)) & 0x07) |
+ ((edx >> (11+2)) & 0x38);
}
}
- ebx += eax;
-
- // esi = rot_comp.Stamp_Map_Adr;
- ptrs = (unsigned short *) (Pico_mcd->word_ram2M + rot_comp.Stamp_Map_Adr + ebx*2);
- edi = ptrs[0] | (ptrs[1] << 16);
-
- // MAKE_IMAGE_PIXEL
- if (!(func & 1)) // NOT TILED
+ else // mode 16x16 dot
{
if (func & 4) // 16x16 screen
{
- if ((edx & 0x00800000) || (ecx & 0x00800000)) goto Pixel_Out;
+ ebx = ((ecx >> (11+4)) & 0x00ff) |
+ ((edx >> (11-4)) & 0xff00);
}
else // 1x1 screen
{
- if ((edx & 0x00f80000) || (ecx & 0x00f80000)) goto Pixel_Out;
+ ebx = ((ecx >> (11+4)) & 0x0f) |
+ ((edx >> (11+0)) & 0xf0);
}
}
- esi = edi;
+
+ edi = stamp_base[ebx];
+ esi = (edi & 0x7ff) << 7;
+ if (!esi) { pixel = 0; goto Pixel_Out; }
edi >>= (11+1);
- esi = (esi & 0x7ff) << 7;
- if (!esi) goto Pixel_Out;
edi &= (0x1c>>1);
eax = ecx;
ebx = edx;
pixel = *(Pico_mcd->word_ram2M + (edi >> 12) + eax);
if (!(edi & 0x800)) pixel >>= 4;
+ else pixel &= 0x0f;
Pixel_Out:
-// pixel = 0;
-//Finish:
- pixel &= 0x0f;
if (!pixel && (func & 0x18)) goto Next_Pixel;
- esi = rot_comp.Buffer_Adr + ((rot_comp.XD>>1)^1); // pixel addr
+ esi = Buffer_Adr + ((XD>>1)^1); // pixel addr
eax = *(Pico_mcd->word_ram2M + esi); // old pixel
- if (rot_comp.XD & 1)
+ if (XD & 1)
{
if ((eax & 0x0f) && (func & 0x18) == 0x08) goto Next_Pixel; // underwrite
*(Pico_mcd->word_ram2M + esi) = pixel | (eax & 0xf0);
Next_Pixel:
- ecx += rot_comp.DXS;
- edx += rot_comp.DYS;
- rot_comp.XD++;
- if (rot_comp.XD >= 8)
+ ecx += (DYXS << 16) >> 16; // _rot_comp.DXS;
+ edx += DYXS >> 16; // _rot_comp.DYS;
+ XD++;
+ if (XD >= 8)
{
- rot_comp.Buffer_Adr += ((rot_comp.Reg_5C & 0x1f) + 1) << 5;
- rot_comp.XD = 0;
+ Buffer_Adr += ((_rot_comp.Reg_5C & 0x1f) + 1) << 5;
+ XD = 0;
}
- rot_comp.H_Dot--;
+ H_Dot--;
}
+ // end while
-//nothing_to_draw:
- rot_comp.YD++;
- // rot_comp.V_Dot--; // will be done by caller
+// nothing_to_draw:
+ _rot_comp.YD++;
+ // _rot_comp.V_Dot--; // will be done by caller
}
-void gfx_cd_update(void)
+PICO_INTERNAL void gfx_cd_update(void)
{
- unsigned char *V_Dot = (unsigned char *) &rot_comp.Reg_64;
+ int V_Dot = _rot_comp.Reg_64 & 0xff;
int jobs;
- dprintf("gfx_cd_update, Reg_64 = %04x", rot_comp.Reg_64);
+ dprintf("gfx_cd_update, Reg_64 = %04x", _rot_comp.Reg_64);
- if (!*V_Dot)
+ if (!V_Dot)
{
gfx_completed();
return;
}
- jobs = rot_comp.Float_Part >> 16;
+ jobs = _rot_comp.Float_Part >> 16;
if (!jobs)
{
- rot_comp.Float_Part += rot_comp.Draw_Speed;
+ _rot_comp.Float_Part += _rot_comp.Draw_Speed;
return;
}
- rot_comp.Float_Part &= 0xffff;
- rot_comp.Float_Part += rot_comp.Draw_Speed;
+ _rot_comp.Float_Part &= 0xffff;
+ _rot_comp.Float_Part += _rot_comp.Draw_Speed;
- while (jobs--)
+ if (PicoOpt & POPT_EN_MCD_GFX)
{
- if (PicoOpt & 0x1000)
- gfx_do(); // jmp [Jmp_Adr]:
+ unsigned int func = _rot_comp.Function;
+ unsigned int H_Dot = _rot_comp.Reg_62 & 0x1ff;
+ unsigned short *stamp_base = (unsigned short *) (Pico_mcd->word_ram2M + _rot_comp.Stamp_Map_Adr);
- (*V_Dot)--; // dec byte [V_Dot]
+ while (jobs--)
+ {
+ gfx_do(func, stamp_base, H_Dot); // jmp [Jmp_Adr]:
- if (!*V_Dot)
+ V_Dot--; // dec byte [V_Dot]
+ if (V_Dot == 0)
+ {
+ // GFX_Completed:
+ gfx_completed();
+ return;
+ }
+ }
+ }
+ else
+ {
+ if (jobs >= V_Dot)
{
- // GFX_Completed:
gfx_completed();
return;
}
+ V_Dot -= jobs;
}
+
+ _rot_comp.Reg_64 = V_Dot;
}
-unsigned int gfx_cd_read(unsigned int a)
+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 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 0;
+ return d;
}
-void gfx_cd_write16(unsigned int a, unsigned int d)
+PICO_INTERNAL_ASM void gfx_cd_write16(unsigned int a, unsigned int d)
{
dprintf("gfx_cd_write16(%x, %04x)", a, d);
switch (a) {
case 0x58: // .Reg_Stamp_Size
- rot_comp.Reg_58 = d & 7;
+ _rot_comp.Reg_58 = d & 7;
return;
case 0x5A: // .Reg_Stamp_Adr
- rot_comp.Reg_5A = d & 0xffe0;
+ _rot_comp.Reg_5A = d & 0xffe0;
return;
case 0x5C: // .Reg_IM_VCell_Size
- rot_comp.Reg_5C = d & 0x1f;
+ _rot_comp.Reg_5C = d & 0x1f;
return;
case 0x5E: // .Reg_IM_Adr
- rot_comp.Reg_5E = d & 0xFFF8;
+ _rot_comp.Reg_5E = d & 0xFFF8;
return;
case 0x60: // .Reg_IM_Offset
- rot_comp.Reg_60 = d & 0x3f;
+ _rot_comp.Reg_60 = d & 0x3f;
return;
case 0x62: // .Reg_IM_HDot_Size
- rot_comp.Reg_62 = d & 0x1ff;
+ _rot_comp.Reg_62 = d & 0x1ff;
return;
case 0x64: // .Reg_IM_VDot_Size
- rot_comp.Reg_64 = d & 0xff; // V_Dot, must be 32bit?
+ _rot_comp.Reg_64 = d & 0xff; // V_Dot, must be 32bit?
return;
case 0x66: // .Reg_Vector_Adr
- rot_comp.Reg_66 = d & 0xfffe;
+ _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;
}
-void gfx_cd_reset(void)
+PICO_INTERNAL void gfx_cd_reset(void)
{
- memset(&rot_comp.Reg_58, 0, sizeof(rot_comp));
+ 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
-void DmaSlowCell(unsigned int source, unsigned int a, int len, unsigned char inc)
+PICO_INTERNAL void DmaSlowCell(unsigned int source, unsigned int a, int len, unsigned char inc)
{
unsigned char *base;
unsigned int asrc, a2;
// AutoIncrement
a=(u16)(a+inc);
}
- rendstatus|=0x10;
+ rendstatus |= PDRAW_SPRITES_MOVED;
break;
case 3: // cram
notaz.gp2x.de / picodrive.git / blobdiff