File: texture.frag

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// 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;
}