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DS GX: Fix alpha blending

This commit is contained in:
Vicki Pfau 2017-03-13 15:35:24 -07:00
parent be1c144513
commit 87867908b7
1 changed files with 15 additions and 1 deletions
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16
src/ds/gx/software.c
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@ -537,21 +537,31 @@ static void DSGXSoftwareRendererDrawScanline(struct DSGXRenderer* renderer, int
_lerpEndpoint(span, &ep, x);
color_t color = _lookupColor(softwareRenderer, &ep, span->poly);
unsigned a = color >> 27;
unsigned current = scanline[x];
unsigned b = current >> 27;
unsigned ab = a;
if (b > ab) {
ab = b;
}
if (a == 0x1F) {
if (softwareRenderer->wSort) {
if (ep.w < softwareRenderer->depthBuffer[x]) {
softwareRenderer->depthBuffer[x] = ep.w;
scanline[x] = color;
} else if (b < 0x1F) {
scanline[x] = _mix32(b, scanline[x], 0x1F - b, color) | a << 27;
}
} else {
if (ep.z < softwareRenderer->depthBuffer[x]) {
softwareRenderer->depthBuffer[x] = ep.z;
scanline[x] = color;
} else if (b < 0x1F) {
scanline[x] = _mix32(b, scanline[x], 0x1F - b, color) | a << 27;
}
}
} else if (a) {
// TODO: Disable alpha?
color = _mix32(a, color, 0x1F - a, scanline[x]);
color = _mix32(a, color, 0x1F - a, current);
if (scanline[x] >> 27 > a) {
a = scanline[x] >> 27;
}
@ -560,11 +570,15 @@ static void DSGXSoftwareRendererDrawScanline(struct DSGXRenderer* renderer, int
if (ep.w < softwareRenderer->depthBuffer[x]) {
softwareRenderer->depthBuffer[x] = ep.w;
scanline[x] = color;
} else if (b < 0x1F) {
scanline[x] = _mix32(b, scanline[x], 0x1F - b, color) | ab << 27;
}
} else {
if (ep.z < softwareRenderer->depthBuffer[x]) {
softwareRenderer->depthBuffer[x] = ep.z;
scanline[x] = color;
} else if (b < 0x1F) {
scanline[x] = _mix32(b, scanline[x], 0x1F - b, color) | ab << 27;
}
}
}