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This commit is contained in:
Tanishq Dubey
2025-04-07 20:08:16 -04:00
parent a8155a2d85
commit 79047a133f
3 changed files with 147 additions and 234 deletions
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20
shaders/histogram.comp
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@ -15,19 +15,6 @@ layout(std430, binding = 1) buffer HistogramBuffer {
// Workgroup size (adjust based on GPU architecture for performance, 16x16 is often reasonable)
layout (local_size_x = 16, local_size_y = 16, local_size_z = 1) in;
// Helper to convert linear float (potentially HDR 0.0+) to 0-255 bin index
// Applies an approximate gamma curve for perceptual binning.
uint linearToVisualBin(float linearVal) {
// Clamp linear value to 0.0-1.0 range before gamma/binning
// This histograms the displayable range after processing.
float clampedVal = clamp(linearVal, 0.0, 1.0);
// Apply approximate sRGB gamma for perceptual brightness mapping
float displayApprox = pow(clampedVal, 1.0/2.2);
// Convert 0.0-1.0 display value to 0-255 bin index
return uint(displayApprox * 255.999); // Use 255.999 to ensure 1.0 maps to 255
}
void main() {
// Get the global invocation ID (like pixel coordinates)
ivec2 pixelCoord = ivec2(gl_GlobalInvocationID.xy);
@ -43,9 +30,10 @@ void main() {
// Calculate bin indices (0-255)
// We clamp just in case, although imageLoad from rgba8 should be in range.
uint rBin = linearToVisualBin(pixelColor.r);
uint gBin = linearToVisualBin(pixelColor.g);
uint bBin = linearToVisualBin(pixelColor.b);
uint rBin = uint(clamp(pixelColor.r, 0.0, 1.0) * 255.0);
uint gBin = uint(clamp(pixelColor.g, 0.0, 1.0) * 255.0);
uint bBin = uint(clamp(pixelColor.b, 0.0, 1.0) * 255.0);
// Atomically increment the counters in the SSBO
// Offset Green bins by 256, Blue bins by 512
atomicAdd(histogram.bins[rBin], 1u);