prevent hue shift from the kernel

Author: devshgraphicsprogramming

examples_tests/49.ComputeFFT/main.cpp

@@ -443,7 +443,7 @@ int main()
 			video::IGPUImage::SCreationParams imageParams;
 			imageParams.flags = static_cast<asset::IImage::E_CREATE_FLAGS>(0u);
 			imageParams.type = asset::IImage::ET_2D;
-			imageParams.format = asset::EF_R16G16_SFLOAT;
+			imageParams.format = useHalfFloats ? EF_R16G16_SFLOAT:EF_R32G32_SFLOAT;
 			imageParams.extent = { paddedKerDim.width,paddedKerDim.height,1u};
 			imageParams.mipLevels = 1u;
 			imageParams.arrayLayers = 1u;
@@ -453,7 +453,7 @@ int main()
 			viewParams.flags = static_cast<video::IGPUImageView::E_CREATE_FLAGS>(0u);
 			viewParams.image = driver->createGPUImageOnDedMem(std::move(imageParams),driver->getDeviceLocalGPUMemoryReqs());
 			viewParams.viewType = video::IGPUImageView::ET_2D;
-			viewParams.format = asset::EF_R16G16_SFLOAT;
+			viewParams.format = useHalfFloats ? EF_R16G16_SFLOAT:EF_R32G32_SFLOAT;
 			viewParams.components = {};
 			viewParams.subresourceRange = {};
 			viewParams.subresourceRange.levelCount = 1u;

examples_tests/49.ComputeFFT/normalization.comp

@@ -15,11 +15,17 @@ layout(push_constant) uniform PushConstants
 	uvec4 bitreverse_shift;
 } pc;
 
+#include <nbl/builtin/glsl/colorspace/encodeCIEXYZ.glsl>
+
 void main()
 {
 	nbl_glsl_complex value = nbl_glsl_ext_FFT_storage_t_get(in_data[nbl_glsl_dot(gl_GlobalInvocationID,pc.strides.xyz)]);
 
-	const float power = abs(nbl_glsl_ext_FFT_storage_t_get(in_data[0]).x); // imaginary component will be 0
+	// imaginary component will be 0, image shall be positive
+	vec3 avg;
+	for (uint i=0u; i<3u; i++)
+		avg[i] = nbl_glsl_ext_FFT_storage_t_get(in_data[pc.strides.z*i]).x;
+	const float power = (nbl_glsl_scRGBtoXYZ*avg).y;
 
 	const uvec2 coord = bitfieldReverse(gl_GlobalInvocationID.xy)>>pc.bitreverse_shift.xy;
 	const nbl_glsl_complex shift = nbl_glsl_expImaginary(-nbl_glsl_PI*float(coord.x+coord.y));