glm/test/external/gli/gtx/gradient.inl
2011-06-23 20:07:13 +01:00

75 lines
2.1 KiB
C++

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