// Expand Rec. 601/Rec. 709 gamma curve. #if 0 // if we have the lut uniform sampler1D PREFIX(rec709_tex); vec4 FUNCNAME(vec2 tc) { vec4 x = LAST_INPUT(tc); x.r = texture1D(PREFIX(rec709_tex), x.r).x; x.g = texture1D(PREFIX(rec709_tex), x.g).x; x.b = texture1D(PREFIX(rec709_tex), x.b).x; return x; } #else // use arithmetic (slow) vec4 FUNCNAME(vec2 tc) { vec4 x = LAST_INPUT(tc); vec3 a = x.rgb * vec3(1.0/4.500); vec3 b = pow((x.rgb + vec3(0.099)) * vec3(1.0/1.099), vec3(1.0/0.45)); vec3 f = vec3(greaterThan(x.rgb, vec3(0.081))); return vec4(mix(a, b, f), x.a); } #endif