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Fix software renderer ignoring texture in transparent render path

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The transparent code path skipped texture sampling entirely, producing
a solid colored rectangle instead of the textured shape. Move texture
sampling before the opaque/transparent branch so both paths get texel
color modulation, and use texel alpha for per-pixel transparency.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Christian Semmler 2026-03-16 12:54:17 -07:00
parent 09ed6edb3e
commit 176aef1d90
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GPG Key ID: 086DAA1360BEEE5C
1 changed files with 45 additions and 37 deletions
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14
miniwin/src/d3drm/backends/software/renderer.cpp
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@ -465,8 +465,7 @@ void Direct3DRMSoftwareRenderer::DrawTriangleProjected(
Uint8* pixelAddr = pixels + y * pitch + x * m_bytesPerPixel; Uint8* pixelAddr = pixels + y * pitch + x * m_bytesPerPixel;
Uint32 finalColor; Uint32 finalColor;
if (appearance.color.a == 255) { Uint8 alpha = appearance.color.a;
zref = z;
if (texels) { if (texels) {
// Perspective correct interpolate texture coords // Perspective correct interpolate texture coords
@ -507,12 +506,21 @@ void Direct3DRMSoftwareRenderer::DrawTriangleProjected(
r = (r * tr + 127) / 255; r = (r * tr + 127) / 255;
g = (g * tg + 127) / 255; g = (g * tg + 127) / 255;
b = (b * tb + 127) / 255; b = (b * tb + 127) / 255;
// Use texel alpha for per-pixel transparency
alpha = ta;
} }
if (alpha == 0) {
continue;
}
if (alpha == 255) {
zref = z;
finalColor = SDL_MapRGBA(m_format, m_palette, r, g, b, 255); finalColor = SDL_MapRGBA(m_format, m_palette, r, g, b, 255);
} }
else { else {
finalColor = BlendPixel(pixelAddr, r, g, b, appearance.color.a); finalColor = BlendPixel(pixelAddr, r, g, b, alpha);
} }
switch (m_bytesPerPixel) { switch (m_bytesPerPixel) {