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LibSoftGPU: Use bitwise and instead of modulus operator for POT textures

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Where possible the sampler will wrap texture coordinates using a bitwise
and instead of a modulus. This speeds up the calculation quite a bit.
This commit is contained in:
Stephan Unverwerth 2022-01-01 18:19:19 +01:00 • committed by Ali Mohammad Pur
parent 034dc480d2
commit 6f261d0362
3 changed files with 46 additions and 6 deletions
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9
Userland/Libraries/LibSoftGPU/Image.cpp
View file

@ -21,6 +21,15 @@ Image::Image(ImageFormat format, unsigned width, unsigned height, unsigned depth
VERIFY(levels > 0);
VERIFY(layers > 0);
if ((width & (width - 1)) == 0)
m_width_is_power_of_two = true;
if ((height & (height - 1)) == 0)
m_height_is_power_of_two = true;
if ((depth & (depth - 1)) == 0)
m_depth_is_power_of_two = true;
m_mipmap_sizes.append({ width, height, depth });
m_mipmap_offsets.append(0);

6
Userland/Libraries/LibSoftGPU/Image.h
View file

@ -28,6 +28,9 @@ public:
unsigned level_depth(unsigned level) const { return m_mipmap_sizes[level].z(); }
unsigned num_levels() const { return m_num_levels; }
unsigned num_layers() const { return m_num_layers; }
bool width_is_power_of_two() const { return m_width_is_power_of_two; }
bool height_is_power_of_two() const { return m_height_is_power_of_two; }
bool depth_is_power_of_two() const { return m_depth_is_power_of_two; }
FloatVector4 texel(unsigned layer, unsigned level, unsigned x, unsigned y, unsigned z) const
{
@ -68,6 +71,9 @@ private:
Vector<size_t, 16> m_mipmap_offsets;
Vector<Vector3<unsigned>, 16> m_mipmap_sizes;
Vector<u8> m_data;
bool m_width_is_power_of_two { false };
bool m_height_is_power_of_two { false };
bool m_depth_is_power_of_two { false };
};
}

37
Userland/Libraries/LibSoftGPU/Sampler.cpp
View file

@ -128,6 +128,9 @@ Vector4<AK::SIMD::f32x4> Sampler::sample_2d(Vector2<AK::SIMD::f32x4> const& uv)
image.level_height(level[3]),
};
u32x4 width_mask = width - 1;
u32x4 height_mask = height - 1;
f32x4 s = wrap(uv.x(), m_config.texture_wrap_u, width);
f32x4 t = wrap(uv.y(), m_config.texture_wrap_v, height);
@ -135,21 +138,43 @@ Vector4<AK::SIMD::f32x4> Sampler::sample_2d(Vector2<AK::SIMD::f32x4> const& uv)
f32x4 v = t * to_f32x4(height);
if (m_config.texture_mag_filter == TextureFilter::Nearest) {
u32x4 i = to_i32x4(u) % width;
u32x4 j = to_i32x4(v) % height;
u32x4 i = to_u32x4(u);
u32x4 j = to_u32x4(v);
u32x4 k = expand4(0u);
i = image.width_is_power_of_two() ? i & width_mask : i % width;
j = image.height_is_power_of_two() ? j & height_mask : j % height;
return texel4(image, layer, level, i, j, k);
}
u -= 0.5f;
v -= 0.5f;
i32x4 i0 = m_config.texture_wrap_u == TextureWrapMode::Repeat ? to_i32x4(to_u32x4(floor_int_range(u)) % width) : to_i32x4(floor_int_range(u));
i32x4 j0 = m_config.texture_wrap_v == TextureWrapMode::Repeat ? to_i32x4(to_u32x4(floor_int_range(v)) % height) : to_i32x4(floor_int_range(v));
i32x4 i0 = to_i32x4(floor_int_range(u));
i32x4 i1 = i0 + 1;
i32x4 j0 = to_i32x4(floor_int_range(v));
i32x4 j1 = j0 + 1;
i32x4 i1 = m_config.texture_wrap_u == TextureWrapMode::Repeat ? to_i32x4((i0 + 1) % width) : i0 + 1;
i32x4 j1 = m_config.texture_wrap_v == TextureWrapMode::Repeat ? to_i32x4((j0 + 1) % height) : j0 + 1;
if (m_config.texture_wrap_u == TextureWrapMode::Repeat) {
if (image.width_is_power_of_two()) {
i0 = (i32x4)(i0 & width_mask);
i1 = (i32x4)(i1 & width_mask);
} else {
i0 = (i32x4)(i0 % width);
i1 = (i32x4)(i1 % width);
}
}
if (m_config.texture_wrap_v == TextureWrapMode::Repeat) {
if (image.height_is_power_of_two()) {
j0 = (i32x4)(j0 & height_mask);
j1 = (i32x4)(j1 & height_mask);
} else {
j0 = (i32x4)(j0 % height);
j1 = (i32x4)(j1 % height);
}
}
u32x4 k = expand4(0u);