VideoShader.hpp

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#ifndef GALAXY_RESOURCE_EMBEDDED_VIDEOSHADER_HPP_
#define GALAXY_RESOURCE_EMBEDDED_VIDEOSHADER_HPP_
 
namespace galaxy
{
    namespace resource
    {
        constexpr const auto video_vert_shader = R"(
            #version 460 core
            
            layout(location = 0) in vec2 vertex;
            
            out vec2 io_texels;
            
            void main()
            {
                io_texels = vertex;
                gl_Position = vec4((vertex * 2.0 - 1.0) * vec2(1, -1), 0.0, 1.0);
            }
        )";
 
        constexpr const auto video_frag_shader = R"(
            #version 460 core
            
            in vec2 io_texels;
            out vec4 io_frag;
            
            uniform sampler2D u_texture_y;
            uniform sampler2D u_texture_cb;
            uniform sampler2D u_texture_cr;
            
            mat4 rec601 = mat4(
                1.16438,  0.00000,  1.59603, -0.87079,
                1.16438, -0.39176, -0.81297,  0.52959,
                1.16438,  2.01723,  0.00000, -1.08139,
                0, 0, 0, 1
            );
            
            void main()
            {
                float y = texture2D(texture_y, tex_coord).r;
                float cb = texture2D(texture_cb, tex_coord).r;
                float cr = texture2D(texture_cr, tex_coord).r;
 
                io_frag = vec4(y, cb, cr, 1.0) * rec601;
            }
        )";
    } // namespace resource
} // namespace galaxy
 
#endif