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Diffuse Irradiance contribution to IBL.

This commit is contained in:
Anish Bhobe 2024-07-30 12:10:35 +02:00
parent ba2e21f52e
commit 7ba132ec0c
6 changed files with 77 additions and 13 deletions
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samples/03_model_render/model/BoxTexturedNonPowerOfTwo.glb (Stored with Git LFS) Normal file
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samples/03_model_render/model/MetalRoughSpheres.glb (Stored with Git LFS) Normal file
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17
samples/03_model_render/model_render.cpp
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@ -372,6 +372,7 @@ main(int, char **)
bool rotating = false;
bool lockToScreen = true;
bool showDiffuse = false;
bool useDiffuse = true;
i32 height = Cast<i32>(internalResolution.height);
f32 camPitch = glm::degrees(cameraController.m_Pitch);
f32 camYaw = glm::degrees(cameraController.m_Yaw);
@ -446,7 +447,11 @@ main(int, char **)
{
cameraController.SetPosition(camPosition);
}
gui::Separator();
gui::Text("IBL");
gui::Checkbox("Show DiffIrr", &showDiffuse);
gui::Checkbox("Use DiffIrr", &useDiffuse);
gui::Separator();
gui::Checkbox("Rotate", &rotating);
gui::PopItemWidth();
if (gui::Button("Exit"))
@ -559,6 +564,18 @@ main(int, char **)
cmd.pushConstants(pipeline.m_Layout, vk::ShaderStageFlagBits::eAll, pcbOffset, sizeof texCube, &texCube);
pcbOffset += sizeof texCube;
}
if (useDiffuse)
{
cmd.pushConstants(pipeline.m_Layout, vk::ShaderStageFlagBits::eAll, pcbOffset, sizeof diffuseIrr,
&diffuseIrr);
pcbOffset += sizeof diffuseIrr;
}
else
{
TextureHandle invalid;
cmd.pushConstants(pipeline.m_Layout, vk::ShaderStageFlagBits::eAll, pcbOffset, sizeof invalid, &invalid);
pcbOffset += sizeof invalid;
}
static_assert(sizeof texCube == sizeof diffuseIrr);
cmd.pushConstants(pipeline.m_Layout, vk::ShaderStageFlagBits::eAll, pcbOffset, sizeof lightManager.m_MetaInfo,
&lightManager.m_MetaInfo);

4
samples/03_model_render/pipeline_utils.cpp
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@ -57,7 +57,7 @@ CreatePipeline(const Device *device, vk::Format attachmentFormat, const GpuResou
vk::PushConstantRange pushConstantRange = {
.stageFlags = vk::ShaderStageFlagBits::eAll,
.offset = 0,
.size = 40,
.size = 44,
};
vk::PipelineLayoutCreateInfo pipelineLayoutCreateInfo = {
@ -206,7 +206,7 @@ CreateBackgroundPipeline(const Device *device, vk::Format attachmentFormat, cons
vk::PushConstantRange pushConstantRange = {
.stageFlags = vk::ShaderStageFlagBits::eAll,
.offset = 0,
.size = 40,
.size = 44,
};
vk::PipelineLayoutCreateInfo pipelineLayoutCreateInfo = {

1
samples/03_model_render/shader/graphics_structs.hlsli
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@ -16,6 +16,7 @@ struct Block
uint MaterialBufferHandle;
uint NodeBufferHandle;
uint EnvCubeHandle;
uint DiffuseIrradianceHandle;
uint LightHandle;
uint PointLightIndexer;
uint DirectionalLightIndexer;

60
samples/03_model_render/shader/model.ps.hlsl
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@ -21,6 +21,13 @@ float4 GetAlbedo(float2 UV, float4 InColor)
return AlbedoFactor * InColor * (AlbedoTexId != INVALID_HANDLE ? Textures[AlbedoTexId].Sample(ImmutableSamplers[AlbedoTexId], UV) : 1.0f.xxxx);
}
float GetOcclusion(float2 UV)
{
uint OcclusionTexId = MaterialsBuffer[PushConstant.MaterialBufferHandle][PushConstant.MaterialIdx].OcclusionTex;
return OcclusionTexId != INVALID_HANDLE ? Textures[OcclusionTexId].Sample(ImmutableSamplers[OcclusionTexId], UV).r : 1.0f;
}
float3 GetEmissive(float2 UV)
{
float3 EmissionFactor = (float3) MaterialsBuffer[PushConstant.MaterialBufferHandle][PushConstant.MaterialIdx].EmissionFactor;
@ -61,6 +68,15 @@ float2 GetMetalRough(float2 UV)
return MetalRoughFactors * (MetalRoughTexId != INVALID_HANDLE ? Textures[MetalRoughTexId].Sample(ImmutableSamplers[MetalRoughTexId], UV).bg : 1.0f.xx); // Metal is B, Rough is G.
}
float3 SampleIrradiance(float3 Direction)
{
if (PushConstant.DiffuseIrradianceHandle != INVALID_HANDLE)
{
return TextureCubes[PushConstant.DiffuseIrradianceHandle].Sample(ImmutableSamplers[PushConstant.DiffuseIrradianceHandle], Direction).rgb;
}
return 0.04f.xxx;
}
float TrowbridgeReitzGGX(float3 Normal, float3 Halfway, float Roughness)
{
float Coeff = Roughness * Roughness;
@ -100,6 +116,12 @@ float3 FresnelSchlick(float cosine, float3 F_0)
return F_0 + (1.0f - F_0) * pow(clamp(1.0f - cosine, 0.0f, 1.0f), 5.0f); // Clamp to avoid artifacts.
}
// Sebastian Lagarde
float3 FresnelSchlickRoughness(float cosine, float3 F_0, float Roughness)
{
return F_0 + (max((1.0f - Roughness).xxx, F_0) - F_0) * pow(clamp(1.0f - cosine, 0.0f, 1.0f), 5.0f); // Clamp to avoid artifacts.
}
float3 GetPBRContrib(float3 Albedo, float3 LightColor, float3 ViewDir, float3 Normal, float Metallic, float Roughness, float3 F_0, float3 LightDir, float LightDistance)
{
float Attenuation = 1.0f / (LightDistance * LightDistance); // TODO: Controlled Attenuation
@ -113,18 +135,18 @@ float3 GetPBRContrib(float3 Albedo, float3 LightColor, float3 ViewDir, float3 No
float NormalDistribution = TrowbridgeReitzGGX(Normal, Halfway, Roughness);
float Geometry = GeometrySmith(NdotV, NdotL, Roughness);
float3 Fresnel = FresnelSchlick(CosineFactor, F_0);
float3 Fresnel = FresnelSchlickRoughness(CosineFactor, F_0, Roughness);
float3 Numerator = (NormalDistribution * Geometry) * Fresnel;
float Denominator = 4.0f * NdotV * NdotL;
float3 Specular = Numerator / max(Denominator, 0.00001);
float3 Specular = Numerator / (Denominator + 0.00001f);
float3 K_Specular = Fresnel;
float3 K_Diffuse = 1.0f.xxx - K_Specular;
K_Diffuse *= 1.0f - Metallic;
return NdotL * Radiance * ((K_Diffuse * Albedo / PI) + Specular);
return NdotL * Radiance * (K_Diffuse * Albedo / PI + Specular);
}
float3 GetPointLightInfluence(float3 Albedo, float2 MetalRough, float3 Position, float3 Normal)
@ -144,7 +166,6 @@ float3 GetPointLightInfluence(float3 Albedo, float2 MetalRough, float3 Position,
// TODO: Cite
float3 F_0 = 0.04f.xxx;
F_0 = lerp(F_0, Albedo, Metallic);
float3 LightAmp = float3(23.47f, 21.31f, 20.79f); // TODO: Get rid
float3 Contrib = 0.0f;
for (uint i = 0; i < Count; ++i)
@ -167,7 +188,7 @@ float3 GetPointLightInfluence(float3 Albedo, float2 MetalRough, float3 Position,
float G = (Light.Color & 0x00FF0000) >> 16;
float B = (Light.Color & 0x0000FF00) >> 8;
float3 LightColor = LightAmp * Light.Intensity * float3(R, G, B) * 0.00392156862f; // 0.00392156862 = 1/255
float3 LightColor = Light.Intensity * float3(R, G, B) * 0.00392156862f; // 0.00392156862 = 1/255
Contrib += GetPBRContrib(Albedo, LightColor, ViewDir, Normal, Metallic, Roughness, F_0, LightDir, LightDistance);
}
@ -192,7 +213,6 @@ float3 GetDirectionalLightInfluence(float3 Albedo, float2 MetalRough, float3 Pos
// TODO: Cite
float3 F_0 = 0.04f.xxx;
F_0 = lerp(F_0, Albedo, Metallic);
float3 LightAmp = float3(23.47f, 21.31f, 20.79f); // TODO: Get rid
float3 Contrib = 0.0f;
for (uint i = 0; i < Count; ++i)
@ -209,7 +229,7 @@ float3 GetDirectionalLightInfluence(float3 Albedo, float2 MetalRough, float3 Pos
float G = (Light.Color & 0x00FF0000) >> 16;
float B = (Light.Color & 0x0000FF00) >> 8;
float3 LightColor = LightAmp * Light.Intensity * float3(R, G, B) * 0.00392156862f; // 0.00392156862 = 1/255
float3 LightColor = Light.Intensity * float3(R, G, B) * 0.00392156862f; // 0.00392156862 = 1/255
Contrib += GetPBRContrib(Albedo, LightColor, ViewDir, Normal, Metallic, Roughness, F_0, LightDir, 1.0f);
}
@ -217,12 +237,27 @@ float3 GetDirectionalLightInfluence(float3 Albedo, float2 MetalRough, float3 Pos
return Contrib;
}
float3 GetAmbientInfluence(float3 Albedo, float2 MetalRough, float3 Position, float3 Normal, float Occlusion)
{
float3 ViewDir = normalize(Camera.Position.xyz - Position);
float CosineFactor = max(dot(Normal, ViewDir), 0.0f); // TODO: Is Normal or is it Halfway?
float3 F_0 = 0.04f.xxx;
F_0 = lerp(F_0, Albedo, MetalRough.r);
float3 K_Specular = FresnelSchlickRoughness(CosineFactor, F_0, MetalRough.g);
float3 K_Diffuse = 1.0f.xxx - K_Specular;
K_Diffuse *= 1.0f - MetalRough.r; // Metals don't have diffuse/refractions.
float3 DiffuseIrradiance = K_Diffuse * Albedo * SampleIrradiance(Normal) * Occlusion;
return DiffuseIrradiance;
}
FS_Output main(FS_Input StageInput)
{
FS_Output Output;
float3 Ambient = float3(0.02f, 0.02f, 0.02f);
// TODO: This should be invalid on the CPU side.
if (PushConstant.MaterialIdx < 0)
{
@ -238,7 +273,12 @@ FS_Output main(FS_Input StageInput)
float Alpha = AlbedoAlpha.a;
float2 MetalRough = GetMetalRough(StageInput.InUV0);
float3 Emission = GetEmissive(StageInput.InUV0);
float3 Color = GetDirectionalLightInfluence(Albedo, MetalRough, Position, Normal) + GetPointLightInfluence(Albedo, MetalRough, Position, Normal);
float Occlusion = GetOcclusion(StageInput.InUV0);
float3 DirectionalLightLum = GetDirectionalLightInfluence(Albedo, MetalRough, Position, Normal);
float3 PointLighLum = GetPointLightInfluence(Albedo, MetalRough, Position, Normal);
float3 AmbientLum = GetAmbientInfluence(Albedo, MetalRough, Position, Normal, Occlusion);
float3 Color = DirectionalLightLum + PointLighLum + AmbientLum;
Output.ColorTarget = float4(Uncharted2Tonemap(Color + Emission), Alpha);
return Output;