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LibGL: Improve texture sampling performance
GL_NEAREST: Remove unnecessary modulo. UV is always in range due to wrapping. GL_LINEAR: Rewrite filter equation to save a few math operations.
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1 changed files with 5 additions and 2 deletions
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@ -68,7 +68,7 @@ FloatVector4 Sampler2D::sample(FloatVector2 const& uv) const
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// Sampling implemented according to https://www.khronos.org/registry/OpenGL/specs/gl/glspec121.pdf Chapter 3.8
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if (m_mag_filter == GL_NEAREST) {
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return mip.texel(static_cast<unsigned>(x) % mip.width(), static_cast<unsigned>(y) % mip.height());
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return mip.texel(static_cast<unsigned>(x), static_cast<unsigned>(y));
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} else if (m_mag_filter == GL_LINEAR) {
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// FIXME: Implement different sampling points for wrap modes other than GL_REPEAT
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@ -88,8 +88,11 @@ FloatVector4 Sampler2D::sample(FloatVector2 const& uv) const
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float frac_x = x - floorf(x);
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float frac_y = y - floorf(y);
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float one_minus_frac_x = 1 - frac_x;
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return t0 * (1 - frac_x) * (1 - frac_y) + t1 * frac_x * (1 - frac_y) + t2 * (1 - frac_x) * frac_y + t3 * frac_x * frac_y;
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auto h1 = t0 * one_minus_frac_x + t1 * frac_x;
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auto h2 = t2 * one_minus_frac_x + t3 * frac_x;
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return h1 * (1 - frac_y) + h2 * frac_y;
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} else {
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VERIFY_NOT_REACHED();
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}
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