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Optimize rendering for relevant formats

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This commit is contained in:
Anders Jenbo 2025-06-11 10:28:39 +02:00
parent c70bf29fdf
commit 1fcfdbe524
1 changed files with 22 additions and 9 deletions
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31
miniwin/src/d3drm/backends/software/renderer.cpp
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@ -123,9 +123,6 @@ void Direct3DRMSoftwareRenderer::DrawTriangleClipped(const D3DRMVERTEX (&v)[3],
}
}
/**
* @todo pre-compute a blending table when running in 256 colors since the game always uses an alpha of 152
*/
void Direct3DRMSoftwareRenderer::BlendPixel(Uint8* pixelAddr, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
Uint32 dstPixel = 0;
@ -143,7 +140,17 @@ void Direct3DRMSoftwareRenderer::BlendPixel(Uint8* pixelAddr, Uint8 r, Uint8 g,
Uint8 outA = static_cast<Uint8>(a + dstA * invAlpha);
Uint32 blended = SDL_MapRGBA(m_format, m_palette, outR, outG, outB, outA);
memcpy(pixelAddr, &blended, m_bytesPerPixel);
switch (m_bytesPerPixel) {
case 1:
*pixelAddr = static_cast<Uint8>(blended);
break;
case 2:
*reinterpret_cast<Uint16*>(pixelAddr) = static_cast<Uint16>(blended);
break;
case 4:
*reinterpret_cast<Uint32*>(pixelAddr) = blended;
break;
}
}
SDL_Color Direct3DRMSoftwareRenderer::ApplyLighting(
@ -394,10 +401,6 @@ void Direct3DRMSoftwareRenderer::DrawTriangleProjected(
case 2:
texelColor = *(Uint16*) texelAddr;
break;
case 3:
// Manually build the 24-bit color (assuming byte order)
texelColor = texelAddr[0] | (texelAddr[1] << 8) | (texelAddr[2] << 16);
break;
case 4:
texelColor = *(Uint32*) texelAddr;
break;
@ -413,7 +416,17 @@ void Direct3DRMSoftwareRenderer::DrawTriangleProjected(
}
Uint32 finalColor = SDL_MapRGBA(m_format, m_palette, r, g, b, 255);
memcpy(pixelAddr, &finalColor, m_bytesPerPixel);
switch (m_bytesPerPixel) {
case 1:
*pixelAddr = static_cast<Uint8>(finalColor);
break;
case 2:
*reinterpret_cast<Uint16*>(pixelAddr) = static_cast<Uint16>(finalColor);
break;
case 4:
*reinterpret_cast<Uint32*>(pixelAddr) = finalColor;
break;
}
}
else {
// Transparent alpha blending with vertex alpha