Trying to add opacity

res/shaders/BasePass.slang

@@ -34,6 +34,6 @@ float4 fragmentMain(in FragmentParameter params) : SV_Target
     // gamma correction
     result = result / (result + float3(1.0));
     result = pow(result, float3(1.0/2.2));
-    return float4(result, 1.0f);
+    return float4(result, brdf.getAlpha());
 }
             

res/shaders/lib/BRDF.slang

@@ -4,11 +4,13 @@ interface IBRDF
 {
     float3 evaluate(float3 viewDir_TS, float3 lightDir_TS, float3 lightColor);
     float3 evaluateAmbient();
+    float getAlpha();
 };
 
 struct Phong : IBRDF
 {
     float3 baseColor;
+    float alpha;
     float3 specular;
     float3 normal;
     float3 ambient;
@@ -16,6 +18,7 @@ struct Phong : IBRDF
 
     __init()
     {
+        alpha = 1;
         normal = float3(0, 0, 1);
     }
 
@@ -33,11 +36,16 @@ struct Phong : IBRDF
     {
         return ambient;
     }
+    float getAlpha()
+    {
+        return alpha;
+    }
 };
 
 struct BlinnPhong : IBRDF
 {
     float3 baseColor;
+    float alpha;
     float3 specularColor;
     float3 normal;
     float shininess;
@@ -45,6 +53,7 @@ struct BlinnPhong : IBRDF
 
     __init()
     {
+        alpha = 1;
         normal = float3(0, 0, 1);
     }
 
@@ -62,15 +71,21 @@ struct BlinnPhong : IBRDF
     {
         return ambient;
     }
+    float getAlpha()
+    {
+        return alpha;
+    }
 };
 
 struct CelShading : IBRDF
 {
     float3 baseColor;
+    float alpha;
     float3 normal;
 
     __init()
     {
+        alpha = 1;
         normal = float3(0, 0, 1);
     }
 
@@ -94,12 +109,17 @@ struct CelShading : IBRDF
     {
         return float3(0, 0, 0);
     }
+    float getAlpha()
+    {
+        return alpha;
+    }
 };
 
 // https://learnopengl.com/PBR/Theory
 struct CookTorrance : IBRDF
 {
     float3 baseColor;
+    float alpha;
     float3 normal;
     float roughness;
     float metallic;
@@ -107,6 +127,7 @@ struct CookTorrance : IBRDF
 
     __init()
     {
+        alpha = 1;
         normal = float3(0, 0, 1);
         roughness = 0;
         metallic = 0;
@@ -176,4 +197,8 @@ struct CookTorrance : IBRDF
     {
         return float3(0.03) * baseColor * ambientOcclusion;
     }
+    float getAlpha()
+    {
+        return alpha;
+    }
 };

res/shaders/raytracing/ClosestHit.slang

@@ -39,7 +39,7 @@ void closestHit(inout RayPayload hitValue, in BuiltInTriangleIntersectionAttribu
     LightingParameter lightingParams = params.getLightingParameter();
     MaterialParameter materialParams = params.getMaterialParameter();
 	let brdf = Material.prepare(materialParams);
-    
+
     float3 result = float3(0, 0, 0);
     for(int i = 0; i < pLightEnv.numDirectionalLights; ++i)
     {
@@ -53,5 +53,7 @@ void closestHit(inout RayPayload hitValue, in BuiltInTriangleIntersectionAttribu
     // gamma correction
     result = result / (result + float3(1.0));
     result = pow(result, float3(1.0/2.2));
+
+    
     hitValue.color = result;
 }

res/shaders/raytracing/RayGen.slang

@@ -19,6 +19,7 @@ void raygen()
     rayDesc.TMax = 10000.0;
 
     RayPayload payload;
+    payload.rayDirection = rayDesc.Direction;
     TraceRay(pRayTracingParams.scene, RAY_FLAG_FORCE_OPAQUE, 0xff, 0, 0, 0, rayDesc, payload);
 
     pRayTracingParams.image[int2(LaunchID.xy)] = float4(payload.color, 1.0);

res/shaders/raytracing/RayTracingData.slang

@@ -17,5 +17,6 @@ struct CallablePayload
 
 struct RayPayload
 {
+    float3 rayDirection;
     float3 color;
 };

src/Editor/Asset/MeshLoader.cpp

@@ -80,6 +80,7 @@ void MeshLoader::loadTextures(const aiScene* scene, const std::filesystem::path&
     }
 }
 
+constexpr const char* KEY_BASE_COLOR = "k_b";
 constexpr const char* KEY_DIFFUSE_COLOR = "k_d";
 constexpr const char* KEY_SPECULAR_COLOR = "k_s";
 constexpr const char* KEY_AMBIENT_COLOR = "k_a";
@@ -270,15 +271,24 @@ void MeshLoader::loadMaterials(const aiScene* scene, const Array<PTextureAsset>&
 
             result = blendKey;
         };
-
         // Diffuse
         addVectorParameter(KEY_DIFFUSE_COLOR, AI_MATKEY_COLOR_DIFFUSE);
-        std::string outputDiffuse = KEY_DIFFUSE_COLOR;
+        std::string outputBase = KEY_BASE_COLOR;
         uint32 numDiffuseTextures = material->GetTextureCount(aiTextureType_DIFFUSE);
         for (uint32 i = 0; i < numDiffuseTextures; ++i) {
-            addTextureParameter(KEY_DIFFUSE_TEXTURE, aiTextureType_DIFFUSE, i, outputDiffuse);
+            addTextureParameter(KEY_DIFFUSE_TEXTURE, aiTextureType_DIFFUSE, i, outputBase, {0, 1, 2, 3});
         }
 
+        std::string outputDiffuse = KEY_DIFFUSE_COLOR;
+        expressions.add(new SwizzleExpression({0, 1, 2, -1}));
+        expressions.back()->key = outputDiffuse;
+        expressions.back()->inputs["target"].source = outputBase;
+
+        std::string outputAlpha = "alpha";
+        expressions.add(new SwizzleExpression({-1, -1, -1, 0}));
+        expressions.back()->key = outputDiffuse;
+        expressions.back()->inputs["target"].source = outputBase;
+
         // Specular
         addVectorParameter(KEY_SPECULAR_COLOR, AI_MATKEY_COLOR_SPECULAR);
         std::string outputSpecular = KEY_SPECULAR_COLOR;
@@ -335,6 +345,7 @@ void MeshLoader::loadMaterials(const aiScene* scene, const Array<PTextureAsset>&
 
         MaterialNode brdf;
         brdf.variables["baseColor"] = outputDiffuse;
+        brdf.variables["alpha"] = outputAlpha;
         if (!outputNormal.empty()) {
             expressions.add(new MulExpression());
             expressions.back()->key = "NormalMul";
@@ -376,15 +387,8 @@ void MeshLoader::loadMaterials(const aiScene* scene, const Array<PTextureAsset>&
             }
             break;
         };
-        bool twoSided = true;
-        material->Get(AI_MATKEY_TWOSIDED, twoSided);
-        float opacity = 1.0f;
-        if (std::strcmp(material->GetName().C_Str(), "3td_Africa_Grass01") == 0)
-        {
-            opacity = 0.5f;
-        }
         OMaterialAsset baseMat = new MaterialAsset(importPath, materialName);
-        baseMat->material = new Material(graphics, numTextures, numSamplers, numFloats, twoSided, opacity, materialName,
+        baseMat->material = new Material(graphics, numTextures, numSamplers, numFloats, 1, 1, materialName,
                                          std::move(expressions), std::move(parameters), std::move(brdf));
         baseMat->material->compile();
         graphics->getShaderCompiler()->registerMaterial(baseMat->material);

src/Engine/Graphics/Vulkan/PipelineCache.cpp

@@ -602,7 +602,7 @@ PRayTracingPipeline PipelineCache::createPipeline(Gfx::RayTracingPipelineCreateI
         .pStages = shaderStages.data(),
         .groupCount = static_cast<uint32>(shaderGroups.size()),
         .pGroups = shaderGroups.data(),
-        .maxPipelineRayRecursionDepth = 1,
+        .maxPipelineRayRecursionDepth = 12,
         .layout = createInfo.pipelineLayout.cast<PipelineLayout>()->getHandle(),
     };
     VkPipeline pipelineHandle;