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fixed/implemented 'Subtract' blend mode #134

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fixed/implemented 'Subtract' blend mode #134

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3 changes: 1 addition & 2 deletions src/SDL_gpu.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1806,9 +1806,8 @@ GPU_BlendMode GPU_GetBlendModeFromPreset(GPU_BlendPresetEnum preset)
}
break;
case GPU_BLEND_SUBTRACT:
// FIXME: Use src alpha for source components?
{
GPU_BlendMode b = {GPU_FUNC_ONE, GPU_FUNC_ONE, GPU_FUNC_ONE, GPU_FUNC_ONE, GPU_EQ_SUBTRACT, GPU_EQ_SUBTRACT};
GPU_BlendMode b = {GPU_FUNC_SRC_ALPHA, GPU_FUNC_ONE, GPU_FUNC_SRC_ALPHA, GPU_FUNC_ONE, GPU_EQ_REVERSE_SUBTRACT, GPU_EQ_ADD};
return b;
}
break;
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