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fix alpha equation when blending is disabled

This commit is contained in:
StapleButter 2017-05-26 03:16:23 +02:00
parent 8558eff8aa
commit 911888f1e0
1 changed files with 15 additions and 11 deletions
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26
src/GPU3D_Soft.cpp
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@ -1025,25 +1025,29 @@ void RenderPolygonScanline(RendererPolygon* rp, s32 y)
u32 dstcolor = ColorBuffer[pixeladdr];
u32 dstalpha = dstcolor >> 24;
if ((dstalpha > 0) && (RenderDispCnt & (1<<3)))
if (dstalpha > 0)
{
u32 srcR = color & 0x3F;
u32 srcG = (color >> 8) & 0x3F;
u32 srcB = (color >> 16) & 0x3F;
u32 dstR = dstcolor & 0x3F;
u32 dstG = (dstcolor >> 8) & 0x3F;
u32 dstB = (dstcolor >> 16) & 0x3F;
if (RenderDispCnt & (1<<3))
{
u32 dstR = dstcolor & 0x3F;
u32 dstG = (dstcolor >> 8) & 0x3F;
u32 dstB = (dstcolor >> 16) & 0x3F;
alpha++;
dstR = ((srcR * alpha) + (dstR * (32-alpha))) >> 5;
dstG = ((srcG * alpha) + (dstG * (32-alpha))) >> 5;
dstB = ((srcB * alpha) + (dstB * (32-alpha))) >> 5;
alpha++;
srcR = ((srcR * alpha) + (dstR * (32-alpha))) >> 5;
srcG = ((srcG * alpha) + (dstG * (32-alpha))) >> 5;
srcB = ((srcB * alpha) + (dstB * (32-alpha))) >> 5;
alpha--;
}
alpha--;
if (alpha > dstalpha) dstalpha = alpha;
if (alpha > dstalpha)
dstalpha = alpha;
color = dstR | (dstG << 8) | (dstB << 16) | (dstalpha << 24);
color = srcR | (srcG << 8) | (srcB << 16) | (dstalpha << 24);
}
if (polygon->Attr & (1<<11))