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LibGL: Implement glTexEnvf

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This controls how fetched texels are combined with the color that was
produced by a preceding texture unit or with the vertex color if it is
the first texture unit.

Currently only a small subset of possible combine modes is implemented
as required by glquake.
This commit is contained in:
Stephan Unverwerth 2021-08-21 13:59:13 +02:00 • committed by Andreas Kling
parent 19a08ff187
commit b54573739c
7 changed files with 66 additions and 7 deletions
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31
Userland/Libraries/LibGL/SoftwareRasterizer.cpp
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@ -483,9 +483,7 @@ SoftwareRasterizer::SoftwareRasterizer(const Gfx::IntSize& min_size)
void SoftwareRasterizer::submit_triangle(const GLTriangle& triangle, const Array<TextureUnit, 32>& texture_units)
{
rasterize_triangle(m_options, *m_render_target, *m_depth_buffer, triangle, [this, &texture_units](const FloatVector2& uv, const FloatVector4& color, float z) -> FloatVector4 {
// TODO: We'd do some kind of multitexturing/blending here
// Construct a vector for the texel we want to sample
FloatVector4 texel = color;
FloatVector4 fragment = color;
for (const auto& texture_unit : texture_units) {
@ -493,8 +491,27 @@ void SoftwareRasterizer::submit_triangle(const GLTriangle& triangle, const Array
if (!texture_unit.is_bound())
continue;
// FIXME: Don't assume Texture2D, _and_ work out how we blend/do multitexturing properly.....
texel = texel * static_ptr_cast<Texture2D>(texture_unit.bound_texture())->sampler().sample(uv);
// FIXME: Don't assume Texture2D
auto texel = texture_unit.bound_texture_2d()->sampler().sample(uv);
// FIXME: Implement more blend modes
switch (texture_unit.env_mode()) {
case GL_MODULATE:
default:
fragment = fragment * texel;
break;
case GL_REPLACE:
fragment = texel;
break;
case GL_DECAL: {
float src_alpha = fragment.w();
float one_minus_src_alpha = 1 - src_alpha;
fragment.set_x(texel.x() * src_alpha + fragment.x() * one_minus_src_alpha);
fragment.set_y(texel.y() * src_alpha + fragment.y() * one_minus_src_alpha);
fragment.set_z(texel.z() * src_alpha + fragment.z() * one_minus_src_alpha);
break;
}
}
}
// Calculate fog
@ -516,10 +533,10 @@ void SoftwareRasterizer::submit_triangle(const GLTriangle& triangle, const Array
}
// Mix texel with fog
texel = mix(m_options.fog_color, texel, factor);
fragment = mix(m_options.fog_color, fragment, factor);
}
return texel;
return fragment;
});
}