75 lines
2.1 KiB
C++
75 lines
2.1 KiB
C++
///////////////////////////////////////////////////////////////////////////////////////////////////
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// OpenGL Image Copyright (c) 2008 - 2011 G-Truc Creation (www.g-truc.net)
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// Created : 2008-12-19
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// Updated : 2010-01-09
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// Licence : This source is under MIT License
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// File : gli/gtx/gradient.inl
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///////////////////////////////////////////////////////////////////////////////////////////////////
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namespace gli{
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namespace gtx{
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namespace gradient
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{
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inline texture2D radial
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(
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texture2D::dimensions_type const & Size,
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texture2D::texcoord_type const & Center,
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float const & Radius,
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texture2D::texcoord_type const & Focal
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)
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{
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image2D Result(texture2D::dimensions_type(Size), gli::RGB8U);
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glm::u8vec3 * DstData = (glm::u8vec3 *)Result.data();
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for(std::size_t y = 0; y < Result.dimensions().y; ++y)
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for(std::size_t x = 0; x < Result.dimensions().x; ++x)
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{
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float Value = glm::radialGradient(
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Center * glm::vec2(Size),
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Radius,
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Focal * glm::vec2(Size),
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glm::vec2(x, y));
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std::size_t Index = x + y * Result.dimensions().x;
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*(DstData + Index) = glm::u8vec3(glm::u8(glm::clamp(Value * 255.f, 0.f, 255.f)));
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}
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gli::texture2D Image(1);
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Image[0] = Result;
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return Image;
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}
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inline texture2D linear
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(
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texture2D::dimensions_type const & Size,
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texture2D::texcoord_type const & Point0,
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texture2D::texcoord_type const & Point1
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)
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{
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image2D Result(texture2D::dimensions_type(Size), gli::RGB8U);
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glm::u8vec3 * DstData = (glm::u8vec3 *)Result.data();
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for(std::size_t y = 0; y < Result.dimensions().y; ++y)
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for(std::size_t x = 0; x < Result.dimensions().x; ++x)
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{
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float Value = glm::linearGradient(
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Point0 * glm::vec2(Size),
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Point1 * glm::vec2(Size),
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texture2D::texcoord_type(x, y));
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std::size_t Index = x + y * Result.dimensions().x;
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*(DstData + Index) = glm::u8vec3(glm::u8(glm::clamp(Value * 255.f, 0.f, 255.f)));
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}
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gli::texture2D Image(1);
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Image[0] = Result;
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return Image;
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}
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}//namespace gradient
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}//namespace gtx
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}//namespace gli
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