/usr/share/gem/examples/10.glsl/texture.frag is in gem-doc 1:0.93.3-9build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | // Cyrille Henry 2007
//#extension GL_ARB_texture_rectangle : enable
//uniform sampler2DRect MyTex;
uniform sampler2D MyTex;
uniform float B,C;
void main (void)
{
vec4 color = texture2D(MyTex, (gl_TextureMatrix[0] * gl_TexCoord[0]).st);
color *= B+1.; // brightness
vec4 gray = vec4(dot(color.rgb,vec3(0.2125, 0.7154, 0.0721)));
color = mix(gray, color, C+1.); // contrast
gl_FragColor = color;
}
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