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LibGL: Implement glDepthFunc

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This commit is contained in:
Stephan Unverwerth 2021-08-16 17:59:45 +02:00 • committed by Andreas Kling
parent a97dbd2317
commit 5b9c87a8b5
7 changed files with 60 additions and 2 deletions
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32
Userland/Libraries/LibGL/SoftwareRasterizer.cpp
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@ -261,8 +261,36 @@ static void rasterize_triangle(const RasterizerOptions& options, Gfx::Bitmap& re
auto barycentric = FloatVector3(coords.x(), coords.y(), coords.z()) * one_over_area;
float z = interpolate(triangle.vertices[0].z, triangle.vertices[1].z, triangle.vertices[2].z, barycentric);
z = options.depth_min + (options.depth_max - options.depth_min) * (z + 1) / 2;
if (z >= *depth) {
bool pass = false;
switch (options.depth_func) {
case GL_ALWAYS:
pass = true;
break;
case GL_NEVER:
pass = false;
break;
case GL_GREATER:
pass = z > *depth;
break;
case GL_GEQUAL:
pass = z >= *depth;
break;
case GL_NOTEQUAL:
pass = z != *depth;
break;
case GL_EQUAL:
pass = z == *depth;
break;
case GL_LEQUAL:
pass = z <= *depth;
break;
case GL_LESS:
pass = z < *depth;
break;
}
if (!pass) {
pixel_mask[y] ^= 1 << x;
continue;
}