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Added shaders for PBR IBL irradiance cube map generation

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saschawillems 2017-04-19 20:29:39 +02:00
parent 4653676522
commit a86c707172
5 changed files with 60 additions and 1 deletions
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37
data/shaders/pbribl/irradiancecube.frag Normal file
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@ -0,0 +1,37 @@
// Generates an irradiance cube from an environment map using convolution
#version 450
layout (location = 0) in vec3 inPos;
layout (location = 0) out vec4 outColor;
layout (binding = 0) uniform samplerCube samplerEnv;
layout(push_constant) uniform PushConsts {
layout (offset = 64) float deltaPhi;
layout (offset = 68) float deltaTheta;
} consts;
#define PI 3.1415926535897932384626433832795
void main()
{
vec3 N = normalize(inPos);
vec3 up = vec3(0.0, 1.0, 0.0);
vec3 right = normalize(cross(up, N));
up = cross(N, right);
const float TWO_PI = PI * 2.0;
const float HALF_PI = PI * 0.5;
vec3 color = vec3(0.0);
uint sampleCount = 0u;
for (float phi = 0.0; phi < TWO_PI; phi += consts.deltaPhi) {
for (float theta = 0.0; theta < HALF_PI; theta += consts.deltaTheta) {
vec3 tempVec = cos(phi) * right + sin(phi) * up;
vec3 sampleVector = cos(theta) * N + sin(theta) * tempVec;
color += texture(samplerEnv, sampleVector).rgb * cos(theta) * sin(theta);
sampleCount++;
}
}
outColor = vec4(PI * color / float(sampleCount), 1.0);
}

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data/shaders/pbribl/irradiancecube.frag.spv Normal file
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4
pbribl/pbribl.cpp
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@ -800,7 +800,9 @@ public:
// Pipeline layout
struct PushBlock {
glm::mat4 mvp;
float sampleDelta = 0.05f;
// Sampling deltas
float deltaPhi = (2.0f * M_PI) / 180.0f;
float deltaTheta = (0.5f * M_PI) / 64.0f;
} pushBlock;
VkPipelineLayout pipelinelayout;

5
pbribl/pbribl.vcxproj
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@ -90,8 +90,13 @@
<ClInclude Include="..\base\vulkantools.h" />
</ItemGroup>
<ItemGroup>
<None Include="..\data\shaders\pbribl\genbrdflut.frag" />
<None Include="..\data\shaders\pbribl\genbrdflut.vert" />
<None Include="..\data\shaders\pbribl\irradiancecube.frag" />
<None Include="..\data\shaders\pbribl\pbribl.frag" />
<None Include="..\data\shaders\pbribl\pbribl.vert" />
<None Include="..\data\shaders\pbribl\prefilterenvmap.frag" />
<None Include="..\data\shaders\pbribl\filtercube.vert" />
<None Include="..\data\shaders\pbribl\skybox.frag" />
<None Include="..\data\shaders\pbribl\skybox.vert" />
</ItemGroup>

15
pbribl/pbribl.vcxproj.filters
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@ -55,5 +55,20 @@
<None Include="..\data\shaders\pbribl\skybox.vert">
<Filter>Shaders</Filter>
</None>
<None Include="..\data\shaders\pbribl\prefilterenvmap.frag">
<Filter>Shaders</Filter>
</None>
<None Include="..\data\shaders\pbribl\genbrdflut.frag">
<Filter>Shaders</Filter>
</None>
<None Include="..\data\shaders\pbribl\genbrdflut.vert">
<Filter>Shaders</Filter>
</None>
<None Include="..\data\shaders\pbribl\filtercube.vert">
<Filter>Shaders</Filter>
</None>
<None Include="..\data\shaders\pbribl\irradiancecube.frag">
<Filter>Shaders</Filter>
</None>
</ItemGroup>
</Project>