69 lines
1.5 KiB
C++
69 lines
1.5 KiB
C++
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#include "mmx.h"
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#include "core.h"
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#include <string.h>
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// Return `true` if CPU supports MMX.
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//
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// 0x4E08A0
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bool mmxIsSupported()
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{
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int v1;
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// TODO: There are other ways to determine MMX using FLAGS register.
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__asm
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{
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mov eax, 1
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cpuid
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and edx, 0x800000
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mov v1, edx
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}
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return v1 != 0;
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}
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// 0x4E0DB0
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void mmxBlit(unsigned char* dest, int destPitch, unsigned char* src, int srcPitch, int width, int height)
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{
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if (gMmxEnabled) {
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// TODO: Blit with MMX.
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gMmxEnabled = false;
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mmxBlit(dest, destPitch, src, srcPitch, width, height);
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gMmxEnabled = true;
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} else {
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for (int y = 0; y < height; y++) {
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memcpy(dest, src, width);
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dest += destPitch;
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src += srcPitch;
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}
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}
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}
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// 0x4E0ED5
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void mmxBlitTrans(unsigned char* dest, int destPitch, unsigned char* src, int srcPitch, int width, int height)
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{
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if (gMmxEnabled) {
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// TODO: Blit with MMX.
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gMmxEnabled = false;
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mmxBlitTrans(dest, destPitch, src, srcPitch, width, height);
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gMmxEnabled = true;
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} else {
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int destSkip = destPitch - width;
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int srcSkip = srcPitch - width;
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for (int y = 0; y < height; y++) {
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for (int x = 0; x < width; x++) {
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unsigned char c = *src++;
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if (c != 0) {
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*dest = c;
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}
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dest++;
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}
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src += srcSkip;
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dest += destSkip;
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}
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}
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}
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