--- hatari/src/convert/spec320x16.c 2019/04/01 07:10:26 1.1.1.4 +++ hatari/src/convert/spec320x16.c 2019/04/09 08:47:29 1.1.1.9 @@ -1,115 +1,96 @@ -/* Screen Conversion, Spec512 to 320x16Bit */ +/* + Hatari - spec320x16.c -void ConvertSpec512_320x16Bit(void) -{ - Uint32 *edi, *ebp; - Uint16 *esi; - register Uint32 eax, ebx, ecx, edx; - - Spec512_StartFrame(); /* Start frame, track palettes */ - - edx = 0; /* Clear index for loop */ - - ScrY = STScreenStartHorizLine; /* Starting line in ST screen */ + This file is distributed under the GNU Public License, version 2 or at your + option any later version. Read the file gpl.txt for details. - do /* y-loop */ - { + Screen Conversion, Spec512 to 320x16Bit +*/ - Spec512_StartScanLine(); /* Build up palettes for every 4 pixels, store in 'ScanLinePalettes' */ - edx = 0; /* Clear index for loop */ - - /* Get screen addresses, 'edi'-ST screen, 'ebp'-Previous ST screen, 'esi'-PC screen */ - eax = STScreenLineOffset[ScrY] + STScreenLeftSkipBytes; /* Offset for this line + Amount to skip on left hand side */ - edi = (Uint32 *)((Uint8 *)pSTScreen + eax); /* ST format screen 4-plane 16 colours */ - ebp = (Uint32 *)((Uint8 *)pSTScreenCopy + eax); /* Previous ST format screen */ - esi = (Uint16 *)pPCScreenDest; /* PC format screen */ - - ScrX=STScreenWidthBytes>>3; /* Amount to draw across in 16-pixels (8 bytes) */ - - do /* x-loop */ - { - ebx = *edi; /* Do 16 pixels at one time */ - ecx = *(edi+1); +static void ConvertSpec512_320x16Bit(void) +{ + Uint32 *edi, *ebp; + Uint16 *esi; + Uint32 eax, ebx, ecx, edx; + Uint32 pixelspace[4]; /* Workspace to store pixels to so can print in right order for Spec512 */ + int y, x; + + Spec512_StartFrame(); /* Start frame, track palettes */ + + edx = 0; /* Clear index for loop */ + + for (y = STScreenStartHorizLine; y < STScreenEndHorizLine; y++) + { + + Spec512_StartScanLine(); /* Build up palettes for every 4 pixels, store in 'ScanLinePalettes' */ + edx = 0; /* Clear index for loop */ + + /* Get screen addresses, 'edi'-ST screen, 'ebp'-Previous ST screen, 'esi'-PC screen */ + eax = STScreenLineOffset[y] + STScreenLeftSkipBytes; /* Offset for this line + Amount to skip on left hand side */ + edi = (Uint32 *)((Uint8 *)pSTScreen + eax); /* ST format screen 4-plane 16 colors */ + ebp = (Uint32 *)((Uint8 *)pSTScreenCopy + eax); /* Previous ST format screen */ + esi = (Uint16 *)pPCScreenDest; /* PC format screen */ + + x = STScreenWidthBytes >> 3; /* Amount to draw across in 16-pixels (8 bytes) */ + + do /* x-loop */ + { + ebx = *edi; /* Do 16 pixels at one time */ + ecx = *(edi+1); #if SDL_BYTEORDER == SDL_LIL_ENDIAN - - /* Convert planes to byte indices - as works in wrong order store to workspace so can read back in order! */ - LOW_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */ - PixelWorkspace[1] = ecx; - LOW_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */ - PixelWorkspace[3] = ecx; - LOW_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */ - PixelWorkspace[0] = ecx; - LOW_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */ - PixelWorkspace[2] = ecx; - - /* And plot, the Spec512 is offset by 1 pixel and works on 'chunks' of 4 pixels */ - /* So, we plot 1_4_4_3 to give 16 pixels, changing palette between */ - /* (last one is used for first of next 16-pixels) */ - ecx = PixelWorkspace[0]; - PLOT_SPEC512_LEFT_LOW_320_16BIT(0) ; - Spec512_UpdatePaletteSpan(); - - ecx = *(Uint32 *)( ((Uint8 *)PixelWorkspace)+1 ); - PLOT_SPEC512_MID_320_16BIT(1) ; - Spec512_UpdatePaletteSpan(); - - ecx = *(Uint32 *)( ((Uint8 *)PixelWorkspace)+5 ); - PLOT_SPEC512_MID_320_16BIT(5) ; - Spec512_UpdatePaletteSpan(); - - ecx = *(Uint32 *)( ((Uint8 *)PixelWorkspace)+9 ); - PLOT_SPEC512_MID_320_16BIT(9) ; - Spec512_UpdatePaletteSpan(); - - ecx = *(Uint32 *)( ((Uint8 *)PixelWorkspace)+13 ); - PLOT_SPEC512_END_LOW_320_16BIT(13) ; - + /* Convert planes to byte indices - as works in wrong order store to workspace so can read back in order! */ + LOW_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */ + pixelspace[1] = ecx; + LOW_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */ + pixelspace[3] = ecx; + LOW_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */ + pixelspace[0] = ecx; + LOW_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */ + pixelspace[2] = ecx; #else - /* Well, I didn't get the code above working on big-endian machines, too, - But I hope the following lines are good enough to also do the job... - THH */ - - LOW_BUILD_PIXELS_0 ; - PixelWorkspace[3] = ecx; - LOW_BUILD_PIXELS_1 ; - PixelWorkspace[1] = ecx; - LOW_BUILD_PIXELS_2 ; - PixelWorkspace[2] = ecx; - LOW_BUILD_PIXELS_3 ; - PixelWorkspace[0] = ecx; - - ecx = PixelWorkspace[0]; - PLOT_SPEC512_MID_320_16BIT(0) ; - Spec512_UpdatePaletteSpan(); - - ecx = PixelWorkspace[1]; - PLOT_SPEC512_MID_320_16BIT(4) ; - Spec512_UpdatePaletteSpan(); - - ecx = PixelWorkspace[2]; - PLOT_SPEC512_MID_320_16BIT(8) ; - Spec512_UpdatePaletteSpan(); - - ecx = PixelWorkspace[3]; - PLOT_SPEC512_MID_320_16BIT(12) ; - Spec512_UpdatePaletteSpan(); - + LOW_BUILD_PIXELS_0 ; + pixelspace[3] = ecx; + LOW_BUILD_PIXELS_1 ; + pixelspace[1] = ecx; + LOW_BUILD_PIXELS_2 ; + pixelspace[2] = ecx; + LOW_BUILD_PIXELS_3 ; + pixelspace[0] = ecx; #endif + /* And plot, the Spec512 is offset by 1 pixel and works on 'chunks' of 4 pixels */ + /* So, we plot 1_4_4_3 to give 16 pixels, changing palette between */ + /* (last one is used for first of next 16-pixels) */ + ecx = pixelspace[0]; + PLOT_SPEC512_LEFT_LOW_320_16BIT(0); + Spec512_UpdatePaletteSpan(); + + ecx = GET_SPEC512_OFFSET_PIXELS(pixelspace, 1); + PLOT_SPEC512_MID_320_16BIT(1); + Spec512_UpdatePaletteSpan(); + + ecx = GET_SPEC512_OFFSET_PIXELS(pixelspace, 5); + PLOT_SPEC512_MID_320_16BIT(5); + Spec512_UpdatePaletteSpan(); + + ecx = GET_SPEC512_OFFSET_PIXELS(pixelspace, 9); + PLOT_SPEC512_MID_320_16BIT(9); + Spec512_UpdatePaletteSpan(); + + ecx = GET_SPEC512_OFFSET_FINAL_PIXELS(pixelspace); + PLOT_SPEC512_END_LOW_320_16BIT(13); + + esi += 16; /* Next PC pixels */ + edi += 2; /* Next ST pixels */ + ebp += 2; /* Next ST copy pixels */ + } + while (--x); /* Loop on X */ + + Spec512_EndScanLine(); + + /* Offset to next line */ + pPCScreenDest = (((Uint8 *)pPCScreenDest) + PCScreenBytesPerLine); + } - esi += 16; /* Next PC pixels */ - edi += 2; /* Next ST pixels */ - ebp += 2; /* Next ST copy pixels */ - } - while( --ScrX ); /* Loop on X */ - - Spec512_EndScanLine(); - - pPCScreenDest = (void *)(((unsigned char *)pPCScreenDest)+PCScreenBytesPerLine); /* Offset to next line */ - ScrY += 1; - } - while( ScrY < STScreenEndHorizLine ); /* Loop on Y */ - - bScreenContentsChanged = TRUE; - + bScreenContentsChanged = true; } -