fix alpha equation when blending is disabled
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8558eff8aa
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@ -1025,25 +1025,29 @@ void RenderPolygonScanline(RendererPolygon* rp, s32 y)
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u32 dstcolor = ColorBuffer[pixeladdr];
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u32 dstalpha = dstcolor >> 24;
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if ((dstalpha > 0) && (RenderDispCnt & (1<<3)))
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if (dstalpha > 0)
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{
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u32 srcR = color & 0x3F;
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u32 srcG = (color >> 8) & 0x3F;
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u32 srcB = (color >> 16) & 0x3F;
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if (RenderDispCnt & (1<<3))
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{
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u32 dstR = dstcolor & 0x3F;
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u32 dstG = (dstcolor >> 8) & 0x3F;
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u32 dstB = (dstcolor >> 16) & 0x3F;
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alpha++;
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dstR = ((srcR * alpha) + (dstR * (32-alpha))) >> 5;
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dstG = ((srcG * alpha) + (dstG * (32-alpha))) >> 5;
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dstB = ((srcB * alpha) + (dstB * (32-alpha))) >> 5;
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srcR = ((srcR * alpha) + (dstR * (32-alpha))) >> 5;
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srcG = ((srcG * alpha) + (dstG * (32-alpha))) >> 5;
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srcB = ((srcB * alpha) + (dstB * (32-alpha))) >> 5;
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alpha--;
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if (alpha > dstalpha) dstalpha = alpha;
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}
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color = dstR | (dstG << 8) | (dstB << 16) | (dstalpha << 24);
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if (alpha > dstalpha)
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dstalpha = alpha;
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color = srcR | (srcG << 8) | (srcB << 16) | (dstalpha << 24);
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}
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if (polygon->Attr & (1<<11))
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