static void Line_ConvertLowRes_640x32Bit_Spec(Uint32 *edi, Uint32 *ebp, Uint32 *esi, Uint32 eax)
{
Uint32 ebx, ecx, edx;
int x, Screen4BytesPerLine;
Uint32 pixelspace[5]; /* Workspace to store pixels to so can print in right order for Spec512 */
/* on x86, unaligned access macro touches also
* next byte, zero it for code checkers
*/
pixelspace[4] = 0;
Spec512_StartScanLine(); /* Build up palettes for every 4 pixels, store in 'ScanLinePalettes' */
x = STScreenWidthBytes >> 3; /* Amount to draw across in 16-pixels (8 bytes) */
Screen4BytesPerLine = PCScreenBytesPerLine/4;
do /* x-loop */
{
ebx = *edi; /* Do 16 pixels at one time */
ecx = *(edi+1);
#if SDL_BYTEORDER == SDL_BIG_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 [12,13,14,15] */
pixelspace[3] = ecx;
LOW_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [4,5,6,7] */
pixelspace[1] = ecx;
LOW_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [8,9,10,11] */
pixelspace[2] = ecx;
LOW_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [0,1,2,3] */
pixelspace[0] = ecx;
#else
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;
#endif
/* And plot, the Spec512 is offset by 1 pixel and works on 'chunks' of 4 pixels */
/* So, we plot 1_4_4_4_3 to give 16 pixels, changing palette between */
/* (last one is used for first of next 16-pixels) */
if (!bScrDoubleY) /* Double on Y? */
{
ecx = pixelspace[0];
PLOT_SPEC512_LEFT_LOW_640_32BIT(0);
Spec512_UpdatePaletteSpan();
ecx = GET_SPEC512_OFFSET_PIXELS(pixelspace, 1);
PLOT_SPEC512_MID_640_32BIT(2);
Spec512_UpdatePaletteSpan();
ecx = GET_SPEC512_OFFSET_PIXELS(pixelspace, 5);
PLOT_SPEC512_MID_640_32BIT(10);
Spec512_UpdatePaletteSpan();
ecx = GET_SPEC512_OFFSET_PIXELS(pixelspace, 9);
PLOT_SPEC512_MID_640_32BIT(18);
Spec512_UpdatePaletteSpan();
ecx = GET_SPEC512_OFFSET_FINAL_PIXELS(pixelspace);
PLOT_SPEC512_END_LOW_640_32BIT(26);
}
else
{
ecx = pixelspace[0];
PLOT_SPEC512_LEFT_LOW_640_32BIT_DOUBLE_Y(0);
Spec512_UpdatePaletteSpan();
ecx = GET_SPEC512_OFFSET_PIXELS(pixelspace, 1);
PLOT_SPEC512_MID_640_32BIT_DOUBLE_Y(2);
Spec512_UpdatePaletteSpan();
ecx = GET_SPEC512_OFFSET_PIXELS(pixelspace, 5);
PLOT_SPEC512_MID_640_32BIT_DOUBLE_Y(10);
Spec512_UpdatePaletteSpan();
ecx = GET_SPEC512_OFFSET_PIXELS(pixelspace, 9);
PLOT_SPEC512_MID_640_32BIT_DOUBLE_Y(18);
Spec512_UpdatePaletteSpan();
ecx = GET_SPEC512_OFFSET_FINAL_PIXELS(pixelspace);
PLOT_SPEC512_END_LOW_640_32BIT_DOUBLE_Y(26);
}
esi += 32; /* Next PC pixels */
edi += 2; /* Next ST pixels */
ebp += 2; /* Next ST copy pixels */
}
while (--x); /* Loop on X */
Spec512_EndScanLine();
}
static void ConvertSpec512_640x32Bit(void)
{
Uint32 *edi, *ebp;
Uint32 *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, Screen4BytesPerLine;
Spec512_StartFrame(); /* Start frame, track palettes */
Screen4BytesPerLine = PCScreenBytesPerLine / 4;
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 = (Uint32 *)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] */
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
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) */
if (!bScrDoubleY) /* Double on Y? */
{
ecx = pixelspace[0];
PLOT_SPEC512_LEFT_LOW_640_32BIT(0);
Spec512_UpdatePaletteSpan();
ecx = GET_SPEC512_OFFSET_PIXELS(pixelspace, 1);
PLOT_SPEC512_MID_640_32BIT(2);
Spec512_UpdatePaletteSpan();
ecx = GET_SPEC512_OFFSET_PIXELS(pixelspace, 5);
PLOT_SPEC512_MID_640_32BIT(10);
Spec512_UpdatePaletteSpan();
ecx = GET_SPEC512_OFFSET_PIXELS(pixelspace, 9);
PLOT_SPEC512_MID_640_32BIT(18);
Spec512_UpdatePaletteSpan();
ecx = GET_SPEC512_OFFSET_FINAL_PIXELS(pixelspace);
PLOT_SPEC512_END_LOW_640_32BIT(26);
}
else
{
ecx = pixelspace[0];
PLOT_SPEC512_LEFT_LOW_640_32BIT_DOUBLE_Y(0);
Spec512_UpdatePaletteSpan();
ecx = GET_SPEC512_OFFSET_PIXELS(pixelspace, 1);
PLOT_SPEC512_MID_640_32BIT_DOUBLE_Y(2);
Spec512_UpdatePaletteSpan();
ecx = GET_SPEC512_OFFSET_PIXELS(pixelspace, 5);
PLOT_SPEC512_MID_640_32BIT_DOUBLE_Y(10);
Spec512_UpdatePaletteSpan();
ecx = GET_SPEC512_OFFSET_PIXELS(pixelspace, 9);
PLOT_SPEC512_MID_640_32BIT_DOUBLE_Y(18);
Spec512_UpdatePaletteSpan();
ecx = GET_SPEC512_OFFSET_FINAL_PIXELS(pixelspace);
PLOT_SPEC512_END_LOW_640_32BIT_DOUBLE_Y(26);
}
esi += 32; /* 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)+2*PCScreenBytesPerLine);
}
bScreenContentsChanged = TRUE;
}
