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1.1.1.2 root 1: /* Screen Conversion, Medium Res to 640x16Bit */ 1.1 root 2: 1.1.1.3 root 3: 1.1.1.5 ! root 4: static void ConvertMediumRes_640x16Bit(void) 1.1 root 5: { 1.1.1.2 root 6: Uint32 *edi, *ebp; 7: Uint16 *esi; 1.1.1.4 root 8: Uint32 eax; 1.1.1.5 ! root 9: int y; 1.1.1.2 root 10: 11: Convert_StartFrame(); /* Start frame, track palettes */ 12: 1.1.1.5 ! root 13: for (y = STScreenStartHorizLine; y < STScreenEndHorizLine; y++) { ! 14: ! 15: eax = STScreenLineOffset[y] + STScreenLeftSkipBytes; /* Offset for this line + Amount to skip on left hand side */ 1.1.1.2 root 16: edi = (Uint32 *)((Uint8 *)pSTScreen + eax); /* ST format screen 4-plane 16 colours */ 17: ebp = (Uint32 *)((Uint8 *)pSTScreenCopy + eax); /* Previous ST format screen */ 1.1.1.3 root 18: esi = (Uint16 *)pPCScreenDest; /* PC format screen */ 19: 1.1.1.5 ! root 20: if( (AdjustLinePaletteRemap(y) & 0x00030000)==0 ) /* Change palette table */ 1.1.1.4 root 21: Line_ConvertLowRes_640x16Bit(edi, ebp, (Uint32 *)esi, eax); 1.1.1.3 root 22: else 1.1.1.4 root 23: Line_ConvertMediumRes_640x16Bit(edi, ebp, esi, eax); 1.1.1.3 root 24: 1.1.1.5 ! root 25: /* Offset to next line */ ! 26: pPCScreenDest = (void *)(((Uint8 *)pPCScreenDest)+PCScreenBytesPerLine*2); 1.1 root 27: } 28: } 1.1.1.3 root 29: 30: 1.1.1.5 ! root 31: static void Line_ConvertMediumRes_640x16Bit(Uint32 *edi, Uint32 *ebp, Uint16 *esi, Uint32 eax) 1.1 root 32: { 1.1.1.5 ! root 33: Uint32 ebx, ecx; ! 34: int x; 1.1.1.2 root 35: 1.1.1.5 ! root 36: x = STScreenWidthBytes>>2; /* Amount to draw across in 16-pixels (4 bytes) */ 1.1.1.2 root 37: 38: do /* x-loop */ 39: { 40: 41: /* Do 16 pixels at one time */ 42: ebx=*edi; 1.1 root 43: 1.1.1.3 root 44: if( (ScrUpdateFlag&0xe0000000) || ebx!=*ebp ) /* Does differ? */ 45: { /* copy word */ 1.1.1.2 root 46: 47: bScreenContentsChanged=TRUE; 1.1 root 48: 1.1.1.2 root 49: #if SDL_BYTEORDER == SDL_BIG_ENDIAN 50: /* Plot in 'right-order' on big endian systems */ 51: if( !bScrDoubleY ) /* Double on Y? */ 52: { 53: MED_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */ 54: PLOT_MED_640_16BIT(12) ; 55: MED_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */ 56: PLOT_MED_640_16BIT(4) ; 57: MED_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */ 58: PLOT_MED_640_16BIT(8) ; 59: MED_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */ 60: PLOT_MED_640_16BIT(0) ; 61: } 62: else 63: { 64: MED_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */ 65: PLOT_MED_640_16BIT_DOUBLE_Y(12) ; 66: MED_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */ 67: PLOT_MED_640_16BIT_DOUBLE_Y(4) ; 68: MED_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */ 69: PLOT_MED_640_16BIT_DOUBLE_Y(8) ; 70: MED_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */ 71: PLOT_MED_640_16BIT_DOUBLE_Y(0) ; 72: } 73: #else 74: /* Plot in 'wrong-order', as ebx is 68000 endian */ 75: if( !bScrDoubleY ) /* Double on Y? */ 76: { 77: MED_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */ 78: PLOT_MED_640_16BIT(4) ; 79: MED_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */ 80: PLOT_MED_640_16BIT(12) ; 81: MED_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */ 82: PLOT_MED_640_16BIT(0) ; 83: MED_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */ 84: PLOT_MED_640_16BIT(8) ; 85: } 86: else 87: { 88: MED_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */ 89: PLOT_MED_640_16BIT_DOUBLE_Y(4) ; 90: MED_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */ 91: PLOT_MED_640_16BIT_DOUBLE_Y(12) ; 92: MED_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */ 93: PLOT_MED_640_16BIT_DOUBLE_Y(0) ; 94: MED_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */ 95: PLOT_MED_640_16BIT_DOUBLE_Y(8) ; 96: } 97: #endif 98: } 99: 100: esi += 16; /* Next PC pixels */ 101: edi += 1; /* Next ST pixels */ 102: ebp += 1; /* Next ST copy pixels */ 103: } 1.1.1.5 ! root 104: while( --x ); /* Loop on X */ 1.1.1.2 root 105: 106: }
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