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https://github.com/RGBCube/serenity
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12785849aa
This extracts the sampler functionality into its own class. Beginning with OpenGL 3 samplers are actual objects, separate from textures. It makes sense to do this already as it also cleans up code organization quite a bit.
53 lines
996 B
C++
53 lines
996 B
C++
/*
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* Copyright (c) 2021, Stephan Unverwerth <s.unverwerth@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "Sampler2D.h"
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#include <LibGL/Tex/Texture2D.h>
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#include <math.h>
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namespace GL {
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static constexpr float wrap_repeat(float value)
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{
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return value - floorf(value);
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}
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FloatVector4 Sampler2D::sample(FloatVector2 const& uv) const
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{
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// FIXME: Calculate the correct mipmap level here, need to receive uv derivatives for that
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unsigned lod = 0;
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MipMap const& mip = m_texture.mipmap(lod);
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float x = uv.x();
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float y = uv.y();
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switch (m_wrap_s_mode) {
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case GL_REPEAT:
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x = wrap_repeat(x);
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break;
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default:
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VERIFY_NOT_REACHED();
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}
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switch (m_wrap_t_mode) {
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case GL_REPEAT:
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y = wrap_repeat(y);
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break;
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default:
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VERIFY_NOT_REACHED();
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}
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x *= mip.width() - 1;
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y *= mip.height() - 1;
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return mip.texel(static_cast<unsigned>(x), static_cast<unsigned>(y));
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}
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}
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