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LibGL: Implement alpha testing in SoftwareRasterizer

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Stephan Unverwerth 2021-05-16 17:09:44 +02:00 • committed by Andreas Kling
parent 1bd754882d
commit 2dcafde330
1 changed files with 42 additions and 0 deletions
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42
Userland/Libraries/LibGL/SoftwareRasterizer.cpp
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@ -316,6 +316,48 @@ static void rasterize_triangle(const RasterizerOptions& options, Gfx::Bitmap& re
}
}
if (options.enable_alpha_test && options.alpha_test_func != GL_ALWAYS) {
// FIXME: I'm not sure if this is the right place to test this.
// If we tested this right at the beginning of our rasterizer routine
// we could skip a lot of work but the GL spec might disagree.
if (options.alpha_test_func == GL_NEVER)
continue;
for (int y = 0; y < RASTERIZER_BLOCK_SIZE; y++) {
auto src = pixel_buffer[y];
for (int x = 0; x < RASTERIZER_BLOCK_SIZE; x++, src++) {
if (~pixel_mask[y] & (1 << x))
continue;
bool passed = true;
switch (options.alpha_test_func) {
case GL_LESS:
passed = src->w() < options.alpha_test_ref_value;
break;
case GL_EQUAL:
passed = src->w() == options.alpha_test_ref_value;
break;
case GL_LEQUAL:
passed = src->w() <= options.alpha_test_ref_value;
break;
case GL_GREATER:
passed = src->w() > options.alpha_test_ref_value;
break;
case GL_NOTEQUAL:
passed = src->w() != options.alpha_test_ref_value;
break;
case GL_GEQUAL:
passed = src->w() >= options.alpha_test_ref_value;
break;
}
if (!passed)
pixel_mask[y] ^= (1 << x);
}
}
}
if (options.enable_blending) {
// Blend color values from pixel_buffer into render_target
for (int y = 0; y < RASTERIZER_BLOCK_SIZE; y++) {