Support rendering single-sided mesh

roeas · Nov 5, 2024 · a1634ac · a1634ac
1 parent a2902af
commit a1634ac
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Showing 3 changed files with 32 additions and 8 deletions.
diff --git a/Engine/Asset/Shader/Lib/Material.glsl b/Engine/Asset/Shader/Lib/Material.glsl
@@ -72,6 +72,11 @@ Material GetMaterial(vec2 uv, vec3 normal, vec3 tangent, vec3 bitangent)
         vec3 normalMap = SampleNormalTexture(uv);
         material.normal = normalize(TBN * normalMap);
         material.normal = normalize(material.normal * u_normalFactor);
+
+        if(!gl_FrontFacing)
+        {
+            material.normal = -material.normal;
+        }
     }
     if (u_useEmissiveTexture)
     {

diff --git a/Engine/Source/Editor/Layer/ImGuiLayer.cpp b/Engine/Source/Editor/Layer/ImGuiLayer.cpp
@@ -1313,6 +1313,8 @@ void ImGuiLayer::ShowDetails()
 
 					StartWithText("Reflectance");
 					ImGui::DragFloat("##Reflectance", &pMaterialResource->m_reflectance, 0.01f, 0.0f, 1.0f);
+					StartWithText("TwoSide");
+					ImGui::Checkbox("##TwoSide", &pMaterialResource->m_twoSide);
 				}
 			}
 			else

diff --git a/Engine/Source/Editor/Layer/RendererLayer.cpp b/Engine/Source/Editor/Layer/RendererLayer.cpp
@@ -176,9 +176,19 @@ void RendererLayer::BasePass()
 		UploadMaterialPropertyGroup(pShader, pMaterialResource->m_occlusionPropertyGroup);
 		UploadMaterialPropertyGroup(pShader, pMaterialResource->m_roughnessPropertyGroup);
 		UploadMaterialPropertyGroup(pShader, pMaterialResource->m_metallicPropertyGroup);
-		
+
 		pShader->UploadUniform(pMaterialResource->m_reflectanceLocation, pMaterialResource->m_reflectance);
 
+		// TODO: Cache current rendering state.
+		if (pMaterialResource->m_twoSide)
+		{
+			sl::RenderCore::Culling(sl::CullingMode::FrontNitherBack);
+		}
+		else
+		{
+			sl::RenderCore::Culling(sl::CullingMode::Back);
+		}
+
 		sl::RenderCore::Submit(pMeshResource->GetVertexArray(), pShader);
 	}
 
@@ -203,14 +213,12 @@ void RendererLayer::EntityIDPass()
 			continue;
 		}
 
-		auto *pShaderResource = sl::ResourceManager::GetShaderResource(rendering.m_optIDShaderResourceName.value());
 		auto *pMeshResource = sl::ResourceManager::GetMeshResource(rendering.m_optMeshResourceName.value());
-		if (!pShaderResource ||!pMeshResource)
-		{
-			continue;
-		}
-
-		if (!pShaderResource->IsReady() || !pMeshResource->IsReady())
+		auto *pMaterialResource = sl::ResourceManager::GetMaterialResource(rendering.m_optMaterialResourceName.value());
+		auto *pShaderResource = sl::ResourceManager::GetShaderResource(rendering.m_optIDShaderResourceName.value());
+		if (!pMeshResource || !pMeshResource->IsReady() ||
+			!pMaterialResource || !pMaterialResource->IsReady() ||
+			!pShaderResource || !pShaderResource->IsReady())
 		{
 			continue;
 		}
@@ -220,6 +228,15 @@ void RendererLayer::EntityIDPass()
 		pShader->UploadUniform(0, transform.GetTransform());
 		pShader->UploadUniform(1, (int)entity);
 
+		if (pMaterialResource->m_twoSide)
+		{
+			sl::RenderCore::Culling(sl::CullingMode::FrontNitherBack);
+		}
+		else
+		{
+			sl::RenderCore::Culling(sl::CullingMode::Back);
+		}
+
 		sl::RenderCore::Submit(pMeshResource->GetVertexArray(), pShader);
 	}