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LibSoftGPU: Call floor_int_range only once in sample_2d_lod

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We were invoking `frac_int_range` twice to get the `alpha` and `beta`
values to interpolate between 4 texels, but these call into
`floor_int_range` again. Let's not repeat the work.
This commit is contained in:
Jelle Raaijmakers 2022-10-15 22:15:39 +02:00 • committed by Linus Groh
parent 88ca72aa79
commit 1c32d93a12
1 changed files with 7 additions and 4 deletions
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11
Userland/Libraries/LibSoftGPU/Sampler.cpp
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@ -190,9 +190,12 @@ Vector4<AK::SIMD::f32x4> Sampler::sample_2d_lod(Vector2<AK::SIMD::f32x4> const&
u -= 0.5f;
v -= 0.5f;
u32x4 i0 = to_u32x4(floor_int_range(u));
f32x4 const floored_u = floor_int_range(u);
f32x4 const floored_v = floor_int_range(v);
u32x4 i0 = to_u32x4(floored_u);
u32x4 i1 = i0 + 1;
u32x4 j0 = to_u32x4(floor_int_range(v));
u32x4 j0 = to_u32x4(floored_v);
u32x4 j1 = j0 + 1;
if (m_config.texture_wrap_u == GPU::TextureWrapMode::Repeat) {
@ -229,8 +232,8 @@ Vector4<AK::SIMD::f32x4> Sampler::sample_2d_lod(Vector2<AK::SIMD::f32x4> const&
t3 = texel4border(image, level, i1, j1, m_config.border_color, width, height);
}
f32x4 const alpha = frac_int_range(u);
f32x4 const beta = frac_int_range(v);
f32x4 const alpha = u - floored_u;
f32x4 const beta = v - floored_v;
auto const lerp_0 = mix(t0, t1, alpha);
auto const lerp_1 = mix(t2, t3, alpha);