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1.1.1.7 ! root 1: /* ! 2: Hatari - low320x8.c 1.1 root 3: 1.1.1.7 ! root 4: This file is distributed under the GNU Public License, version 2 or at your ! 5: option any later version. Read the file gpl.txt for details. ! 6: ! 7: Screen Conversion, Medium Res to 640x16Bit ! 8: */ 1.1.1.3 root 9: 1.1.1.5 root 10: static void ConvertMediumRes_640x16Bit(void) 1.1 root 11: { 1.1.1.7 ! root 12: Uint32 *edi, *ebp; ! 13: Uint16 *esi; ! 14: Uint32 eax; ! 15: int y; ! 16: ! 17: Convert_StartFrame(); /* Start frame, track palettes */ ! 18: ! 19: for (y = STScreenStartHorizLine; y < STScreenEndHorizLine; y++) ! 20: { ! 21: ! 22: eax = STScreenLineOffset[y] + STScreenLeftSkipBytes; /* Offset for this line + Amount to skip on left hand side */ ! 23: edi = (Uint32 *)((Uint8 *)pSTScreen + eax); /* ST format screen 4-plane 16 colors */ ! 24: ebp = (Uint32 *)((Uint8 *)pSTScreenCopy + eax); /* Previous ST format screen */ ! 25: esi = (Uint16 *)pPCScreenDest; /* PC format screen */ ! 26: ! 27: if (AdjustLinePaletteRemap(y) & 0x00030000) /* Change palette table */ ! 28: Line_ConvertMediumRes_640x16Bit(edi, ebp, esi, eax); ! 29: else ! 30: Line_ConvertLowRes_640x16Bit(edi, ebp, (Uint32 *)esi, eax); ! 31: ! 32: /* Offset to next line */ ! 33: pPCScreenDest = (((Uint8 *)pPCScreenDest) + PCScreenBytesPerLine * 2); ! 34: } 1.1 root 35: } 1.1.1.3 root 36: 37: 1.1.1.5 root 38: static void Line_ConvertMediumRes_640x16Bit(Uint32 *edi, Uint32 *ebp, Uint16 *esi, Uint32 eax) 1.1 root 39: { 1.1.1.7 ! root 40: Uint32 ebx, ecx; ! 41: int x, update, Screen2BytesPerLine; 1.1.1.2 root 42: 1.1.1.7 ! root 43: x = STScreenWidthBytes >> 2; /* Amount to draw across in 16-pixels (4 bytes) */ ! 44: Screen2BytesPerLine = PCScreenBytesPerLine/2; ! 45: update = ScrUpdateFlag & PALETTEMASK_UPDATEMASK; 1.1.1.2 root 46: 1.1.1.7 ! root 47: do /* x-loop */ ! 48: { 1.1.1.2 root 49: 1.1.1.7 ! root 50: /* Do 16 pixels at one time */ ! 51: ebx = *edi; 1.1 root 52: 1.1.1.7 ! root 53: if (update || ebx != *ebp) /* Does differ? */ ! 54: { ! 55: /* copy word */ 1.1.1.2 root 56: 1.1.1.7 ! root 57: bScreenContentsChanged=TRUE; 1.1 root 58: 1.1.1.2 root 59: #if SDL_BYTEORDER == SDL_BIG_ENDIAN 1.1.1.7 ! root 60: /* Plot in 'right-order' on big endian systems */ ! 61: if (!bScrDoubleY) /* Double on Y? */ ! 62: { ! 63: MED_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */ ! 64: PLOT_MED_640_16BIT(12) ; ! 65: MED_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */ ! 66: PLOT_MED_640_16BIT(4) ; ! 67: MED_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */ ! 68: PLOT_MED_640_16BIT(8) ; ! 69: MED_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */ ! 70: PLOT_MED_640_16BIT(0) ; ! 71: } ! 72: else ! 73: { ! 74: MED_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */ ! 75: PLOT_MED_640_16BIT_DOUBLE_Y(12) ; ! 76: MED_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */ ! 77: PLOT_MED_640_16BIT_DOUBLE_Y(4) ; ! 78: MED_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */ ! 79: PLOT_MED_640_16BIT_DOUBLE_Y(8) ; ! 80: MED_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */ ! 81: PLOT_MED_640_16BIT_DOUBLE_Y(0) ; ! 82: } 1.1.1.2 root 83: #else 1.1.1.7 ! root 84: /* Plot in 'wrong-order', as ebx is 68000 endian */ ! 85: if (!bScrDoubleY) /* Double on Y? */ ! 86: { ! 87: MED_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */ ! 88: PLOT_MED_640_16BIT(4) ; ! 89: MED_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */ ! 90: PLOT_MED_640_16BIT(12) ; ! 91: MED_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */ ! 92: PLOT_MED_640_16BIT(0) ; ! 93: MED_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */ ! 94: PLOT_MED_640_16BIT(8) ; ! 95: } ! 96: else ! 97: { ! 98: MED_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */ ! 99: PLOT_MED_640_16BIT_DOUBLE_Y(4) ; ! 100: MED_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */ ! 101: PLOT_MED_640_16BIT_DOUBLE_Y(12) ; ! 102: MED_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */ ! 103: PLOT_MED_640_16BIT_DOUBLE_Y(0) ; ! 104: MED_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */ ! 105: PLOT_MED_640_16BIT_DOUBLE_Y(8) ; ! 106: } 1.1.1.2 root 107: #endif 1.1.1.7 ! root 108: } 1.1.1.2 root 109: 1.1.1.7 ! root 110: esi += 16; /* Next PC pixels */ ! 111: edi += 1; /* Next ST pixels */ ! 112: ebp += 1; /* Next ST copy pixels */ ! 113: } ! 114: while (--x); /* Loop on X */ 1.1.1.2 root 115: 116: }
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