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1.1.1.5 root 1: /*
2: Hatari - vdi4.c
3:
1.1.1.8 ! root 4: This file is distributed under the GNU General Public License, version 2
! 5: or at your option any later version. Read the file gpl.txt for details.
1.1.1.5 root 6:
7: Screen Conversion, VDI resolution with 4 colors
8: */
1.1 root 9:
10:
1.1.1.3 root 11: static void ConvertVDIRes_4Colour(void)
1.1 root 12: {
1.1.1.5 root 13: Uint32 *edi, *ebp;
14: Uint32 *esi;
15: Uint32 eax, ebx, ecx;
16: int y, x, update;
1.1.1.2 root 17:
1.1.1.5 root 18: /* Get screen addresses, 'edi'-ST screen, 'ebp'-Previous ST screen, 'esi'-PC screen */
19: edi = (Uint32 *)pSTScreen; /* ST format screen 2-plane 4 colors */
20: ebp = (Uint32 *)pSTScreenCopy; /* Previous ST format screen */
21: update = ScrUpdateFlag & PALETTEMASK_UPDATEMASK;
1.1.1.2 root 22:
1.1.1.5 root 23: for (y = 0; y < VDIHeight; y++)
24: {
1.1.1.3 root 25:
1.1.1.5 root 26: esi = (Uint32 *)pPCScreenDest; /* PC format screen, byte per pixel 256 colors */
1.1.1.2 root 27:
1.1.1.5 root 28: x = VDIWidth >> 4; /* Amount to draw across - in 16-pixels (4 bytes) */
1.1.1.2 root 29:
1.1.1.5 root 30: do /* x-loop */
31: {
32: /* Do 16 pixels at one time */
33: ebx = *edi;
1.1.1.2 root 34:
1.1.1.5 root 35: if (update || ebx != *ebp) /* Update? */
36: {
1.1.1.6 root 37: bScreenContentsChanged = true;
1.1.1.2 root 38:
1.1.1.5 root 39: /* Plot pixels */
1.1.1.2 root 40: #if SDL_BYTEORDER == SDL_BIG_ENDIAN
1.1.1.7 root 41: MED_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [12,13,14,15] */
1.1.1.5 root 42: PLOT_MED_640_8BIT(3) ;
1.1.1.7 root 43: MED_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [4,5,6,7] */
1.1.1.5 root 44: PLOT_MED_640_8BIT(1) ;
1.1.1.7 root 45: MED_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [8,9,10,11] */
1.1.1.5 root 46: PLOT_MED_640_8BIT(2) ;
1.1.1.7 root 47: MED_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [0,1,2,3] */
1.1.1.5 root 48: PLOT_MED_640_8BIT(0) ;
1.1.1.2 root 49: #else
1.1.1.5 root 50: MED_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */
51: PLOT_MED_640_8BIT(1) ;
52: MED_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */
53: PLOT_MED_640_8BIT(3) ;
54: MED_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */
55: PLOT_MED_640_8BIT(0) ;
56: MED_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */
57: PLOT_MED_640_8BIT(2) ;
1.1.1.2 root 58: #endif
1.1.1.5 root 59: }
1.1.1.2 root 60:
1.1.1.5 root 61: esi += 4; /* Next PC pixels */
62: edi += 1; /* Next ST pixels */
63: ebp += 1; /* Next ST copy pixels */
64: }
65: while (--x); /* Loop on X */
66:
67: /* Offset to next line */
68: pPCScreenDest = (((Uint8 *)pPCScreenDest) + PCScreenBytesPerLine);
69: }
1.1 root 70: }
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