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LibGL: Fix GL_TRIANGLE_STRIP rendering only half its triangles

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According to the documentation, we should switch around vertices every
other triangle to prevent front-face culling from removing them.

This allows Tux in Tux Racer to render correctly.
This commit is contained in:
Jelle Raaijmakers 2021-12-24 14:48:00 +01:00 • committed by Andreas Kling
parent b455e6ca0d
commit 60fa921daa
1 changed files with 9 additions and 3 deletions
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12
Userland/Libraries/LibSoftGPU/Device.cpp
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@ -565,9 +565,15 @@ void Device::draw_primitives(PrimitiveType primitive_type, FloatMatrix4x4 const&
} else if (primitive_type == PrimitiveType::TriangleStrip) {
Triangle triangle;
for (size_t i = 0; i < vertices.size() - 2; i++) {
triangle.vertices[0] = vertices.at(i);
triangle.vertices[1] = vertices.at(i + 1);
triangle.vertices[2] = vertices.at(i + 2);
if (i % 2 == 0) {
triangle.vertices[0] = vertices.at(i);
triangle.vertices[1] = vertices.at(i + 1);
triangle.vertices[2] = vertices.at(i + 2);
} else {
triangle.vertices[0] = vertices.at(i + 1);
triangle.vertices[1] = vertices.at(i);
triangle.vertices[2] = vertices.at(i + 2);
}
m_triangle_list.append(triangle);
}
}