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LibGL+LibGPU+LibSoftGPU: Implement GL_GENERATE_MIPMAP

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We can now generate texture mipmaps on the fly if the client requests
it. This fixes the missing textures in our PrBoom+ port.
This commit is contained in:
Jelle Raaijmakers 2022-09-04 22:18:16 +02:00 • committed by Linus Groh
parent dda5987684
commit 1540c56e6c
10 changed files with 148 additions and 82 deletions
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22
Userland/Libraries/LibSoftGPU/Sampler.cpp
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@ -117,8 +117,8 @@ Vector4<AK::SIMD::f32x4> Sampler::sample_2d(Vector2<AK::SIMD::f32x4> const& uv)
// FIXME: Static casting from u32 to float could silently truncate here.
// u16 should be plenty enough for texture dimensions and would allow textures of up to 65536x65536x65536 pixels.
auto texel_coordinates = uv;
texel_coordinates.set_x(texel_coordinates.x() * static_cast<float>(image.level_width(base_level)));
texel_coordinates.set_y(texel_coordinates.y() * static_cast<float>(image.level_height(base_level)));
texel_coordinates.set_x(texel_coordinates.x() * static_cast<float>(image.width_at_level(base_level)));
texel_coordinates.set_y(texel_coordinates.y() * static_cast<float>(image.height_at_level(base_level)));
auto dtdx = ddx(texel_coordinates);
auto dtdy = ddy(texel_coordinates);
auto scale_factor = max(dtdx.dot(dtdx), dtdy.dot(dtdy));
@ -138,7 +138,7 @@ Vector4<AK::SIMD::f32x4> Sampler::sample_2d(Vector2<AK::SIMD::f32x4> const& uv)
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(static_cast<float>(image.num_levels()) - 1.f);
auto max_level = expand4(static_cast<float>(image.number_of_levels()) - 1.f);
auto lambda_xy = log2_approximate(scale_factor) * .5f + texture_lod_bias;
auto level = clamp(lambda_xy, min_level, max_level);
@ -157,16 +157,16 @@ Vector4<AK::SIMD::f32x4> Sampler::sample_2d_lod(Vector2<AK::SIMD::f32x4> const&
auto const& image = *static_ptr_cast<Image>(m_config.bound_image);
u32x4 const width = {
image.level_width(level[0]),
image.level_width(level[1]),
image.level_width(level[2]),
image.level_width(level[3]),
image.width_at_level(level[0]),
image.width_at_level(level[1]),
image.width_at_level(level[2]),
image.width_at_level(level[3]),
};
u32x4 const height = {
image.level_height(level[0]),
image.level_height(level[1]),
image.level_height(level[2]),
image.level_height(level[3]),
image.height_at_level(level[0]),
image.height_at_level(level[1]),
image.height_at_level(level[2]),
image.height_at_level(level[3]),
};
auto f_width = to_f32x4(width);