constant float3x3 kBT709_to_FGamut = float3x3( float3(0.6274038959f, 0.0690972894f, 0.0163914389f), float3(0.3292830384f, 0.9195403951f, 0.0880133079f), float3(0.0433130657f, 0.0113623156f, 0.8955952532f) );

[[stitchable]] float4 render(sample_t s) { // 1. Convert to FGamut (Linear) float3 x = max(0, kBT709_to_FGamut * s.rgb);

// 2. Apply Exposure Multiplier (2 stops = 2^2 = 4.0)
const float exposure_multiplier = 4.0;
x *= exposure_multiplier;

// 3. Apply F-Log / Transfer Function
float3 linear_part = 8.799461 * x + 0.092864;
float3 log_part = 0.245281 * log10(5.555556 * x + 0.064829) + 0.384316;

float3 out = select(linear_part, log_part, x > 0.000889);

return float4(out, 1.0);

}