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LibGL+LibSoftGPU: Implement fixed pipeline support for GL_COMBINE

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`GL_COMBINE` is basically a fixed function calculator to perform simple
arithmetics on configurable fragment sources. This patch implements a
number of texture env parameters with support for the RGBA internal
format.
This commit is contained in:
Jelle Raaijmakers 2022-09-04 16:53:23 +02:00 • committed by Linus Groh
parent 494024b70e
commit 1d36bfdac1
10 changed files with 461 additions and 58 deletions
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7
Userland/Libraries/LibSoftGPU/Sampler.cpp
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@ -134,10 +134,13 @@ Vector4<AK::SIMD::f32x4> Sampler::sample_2d(Vector2<AK::SIMD::f32x4> const& uv)
if (m_config.mipmap_filter == GPU::MipMapFilter::None)
return sample_2d_lod(uv, expand4(base_level), m_config.texture_min_filter);
// FIXME: add texture-level support for GL_TEXTURE_LOD_BIAS; below is only texture unit-level
auto texture_lod_bias = AK::clamp(m_config.level_of_detail_bias, -MAX_TEXTURE_LOD_BIAS, MAX_TEXTURE_LOD_BIAS);
// FIXME: Instead of clamping to num_levels - 1, actually make the max mipmap level configurable with glTexParameteri(GL_TEXTURE_MAX_LEVEL, max_level)
auto min_level = expand4(static_cast<float>(base_level));
auto max_level = expand4(image.num_levels() - 1.0f);
auto level = min(max(log2_approximate(scale_factor) * 0.5f, min_level), max_level);
auto max_level = expand4(static_cast<float>(image.num_levels()) - 1.f);
auto lambda_xy = log2_approximate(scale_factor) * .5f + texture_lod_bias;
auto level = clamp(lambda_xy, min_level, max_level);
auto lower_level_texel = sample_2d_lod(uv, to_u32x4(level), m_config.texture_min_filter);