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// $Id$
//
// Fragment shader for skybox drawing
//
// Author: Dan Gudmundsson
//
#version 120
#include "lib_base.glsl"
// #include "lib_normal.glsl"
#include "lib_envlight.glsl"
// #include "lib_material.glsl"
varying vec3 position;
uniform vec3 ws_eyepoint;
uniform float bg_blur;
uniform float Exposure;
void main(void)
{
vec3 view_vec = normalize(-position);
vec2 index = vec2uv(view_vec);
index = vec2(index.x+bg_rotate, index.y);
float scale = 3.0; // ~ sqrt(NoOfmipmaps) mipmaps = 10 for 2048x1024
float lod = pow((0.1+bg_blur) * scale, 2.0);
#ifdef GL_ARB_shader_texture_lod
vec3 col = SRGBtoLINEAR(texture2DLod(EnvSpecMap, index, lod)).rgb;
#else // NO GL_ARB_shader_texture_lod
vec3 col = SRGBtoLINEAR(texture2D(EnvSpecMap, index, lod)).rgb;
#endif // GL_ARB_shader_texture_lod
col *= Exposure;
gl_FragColor = vec4(pow(col, vec3(1.0/2.2)), 1.0);
}
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