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Add screen vignette to Eye Adaptation histogram for more accurate exposure

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This commit is contained in:
Wojtek Figat
2026-01-12 23:47:15 +01:00
parent ab806b2a9b
commit 2501095500
2 changed files with 16 additions and 8 deletions
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Content/Shaders/Histogram.flax (Stored with Git LFS)
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20
Source/Shaders/Histogram.shader
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@@ -46,20 +46,28 @@ groupshared uint SharedHistogram[HISTOGRAM_SIZE];
// Generates the histogram
META_CS(true, FEATURE_LEVEL_SM5)
[numthreads(THREADGROUP_SIZE_X, THREADGROUP_SIZE_Y, 1)]
void CS_GenerateHistogram(uint3 groupId : SV_GroupID, uint3 dispatchThreadId : SV_DispatchThreadID, uint3 groupThreadId : SV_GroupThreadID, uint groupIndex : SV_GroupIndex)
void CS_GenerateHistogram(uint3 dispatchThreadId : SV_DispatchThreadID, uint3 groupThreadId : SV_GroupThreadID)
{
const uint localThreadId = groupThreadId.y * THREADGROUP_SIZE_X + groupThreadId.x;
const uint threadId = groupThreadId.y * THREADGROUP_SIZE_X + groupThreadId.x;
// Clear the histogram
if (localThreadId < HISTOGRAM_SIZE)
SharedHistogram[localThreadId] = 0u;
if (threadId < HISTOGRAM_SIZE)
SharedHistogram[threadId] = 0u;
GroupMemoryBarrierWithGroupSync();
// Gather local group histogram
if (dispatchThreadId.x < InputSize.x && dispatchThreadId.y < InputSize.y)
{
#if 1
// Screen vignette to put more weight into samples in the center of the image
float2 uv = (float2)dispatchThreadId.xy / float2(InputSize.x, InputSize.y);
float2 center = abs(uv - float2(0.5f, 0.5f));
float scale = saturate(1 - dot(center, center));
uint weight = (uint)(scale * scale * 64.0f);
#else
uint weight = 1u;
#endif
float3 color = Input[dispatchThreadId.xy].xyz;
float luminance = Luminance(color);
float logLuminance = ComputeHistogramPositionFromLuminance(luminance);
@@ -70,8 +78,8 @@ void CS_GenerateHistogram(uint3 groupId : SV_GroupID, uint3 dispatchThreadId : S
GroupMemoryBarrierWithGroupSync();
// Merge everything
if (localThreadId < HISTOGRAM_SIZE)
InterlockedAdd(HistogramBuffer[localThreadId], SharedHistogram[localThreadId]);
if (threadId < HISTOGRAM_SIZE)
InterlockedAdd(HistogramBuffer[threadId], SharedHistogram[threadId]);
}
#endif