more accuracy fixes

[picodrive.git] / Pico / cd / gfx_cd.c

diff --git a/Pico/cd/gfx_cd.c b/Pico/cd/gfx_cd.c
index f902235..42862b6 100644 (file)
--- a/Pico/cd/gfx_cd.c
+++ b/Pico/cd/gfx_cd.c
@@ -1,3 +1,9 @@
+// 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 "../PicoInt.h"
 
@@ -31,8 +37,6 @@ static void gfx_cd_start(void)
 {
        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?
@@ -61,6 +65,8 @@ static void gfx_cd_start(void)
                        break;
        }
 
+       dprintf("gfx_cd_start, stamp_map_addr=%06x", rot_comp.Stamp_Map_Adr);
+
        gfx_cd_update();
 }
 
@@ -95,6 +101,18 @@ static void gfx_do(unsigned int func, unsigned short *stamp_base, unsigned int H
        // 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
@@ -122,19 +140,7 @@ static void gfx_do(unsigned int func, unsigned short *stamp_base, unsigned int H
                        }
                }
 
-               // 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;
-                       }
-               }
-
-               edi = stamp_base[ebx];// | (stamp_base[ebx+1] << 16);
+               edi = stamp_base[ebx];
                esi = (edi & 0x7ff) << 7;
                if (!esi) { pixel = 0; goto Pixel_Out; }
                edi >>= (11+1);