mirror of
https://github.com/Wiimpathy/HatariWii.git
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77 lines
2.4 KiB
C
77 lines
2.4 KiB
C
/*
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Hatari - low320x16.c
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This file is distributed under the GNU General Public License, version 2
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or at your option any later version. Read the file gpl.txt for details.
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Screen Conversion, Low Res to 320x16Bit
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*/
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static void ConvertLowRes_320x16Bit(void)
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{
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Uint32 *edi, *ebp;
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Uint16 *esi;
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Uint32 eax, edx;
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Uint32 ebx, ecx;
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int y, x, update;
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Convert_StartFrame(); /* Start frame, track palettes */
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for (y = STScreenStartHorizLine; y < STScreenEndHorizLine; y++)
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{
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eax = STScreenLineOffset[y] + STScreenLeftSkipBytes; /* Offset for this line + Amount to skip on left hand side */
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edi = (Uint32 *)((Uint8 *)pSTScreen + eax); /* ST format screen 4-plane 16 colors */
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ebp = (Uint32 *)((Uint8 *)pSTScreenCopy + eax); /* Previous ST format screen */
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esi = (Uint16 *)pPCScreenDest; /* PC format screen */
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update = AdjustLinePaletteRemap(y) & PALETTEMASK_UPDATEMASK;
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x = STScreenWidthBytes>>3; /* Amount to draw across in 16-pixels (8 bytes) */
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do /* x-loop */
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{
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/* Do 16 pixels at one time */
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ebx = *edi;
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ecx = *(edi+1);
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if (update || ebx!=*ebp || ecx!=*(ebp+1)) /* Does differ? */
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{
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/* copy word */
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bScreenContentsChanged = true;
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#if SDL_BYTEORDER == SDL_BIG_ENDIAN
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/* Plot pixels */
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LOW_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [12,13,14,15] */
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PLOT_LOW_320_16BIT(12) ;
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LOW_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [4,5,6,7] */
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PLOT_LOW_320_16BIT(4) ;
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LOW_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [8,9,10,11] */
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PLOT_LOW_320_16BIT(8) ;
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LOW_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [0,1,2,3] */
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PLOT_LOW_320_16BIT(0) ;
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#else
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/* Plot pixels */
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LOW_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */
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PLOT_LOW_320_16BIT(4) ;
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LOW_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */
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PLOT_LOW_320_16BIT(12) ;
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LOW_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */
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PLOT_LOW_320_16BIT(0) ;
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LOW_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */
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PLOT_LOW_320_16BIT(8) ;
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#endif
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}
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esi += 16; /* Next PC pixels */
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edi += 2; /* Next ST pixels */
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ebp += 2; /* Next ST copy pixels */
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}
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while (--x); /* Loop on X */
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/* Offset to next line: */
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pPCScreenDest = (((Uint8 *)pPCScreenDest)+PCScreenBytesPerLine);
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}
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}
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