Working ModelLoading Sample (#53)

abhayMore · web-flow · commit dfc4e5004ec6 · 2024-08-28T22:32:33.000+05:30
* Working MeshLoading Sample (#3) Working MeshLoading Sample * Fix vertex shader matrices calulcation * PR changes : Added comments, refactored macro for tinyobjloader
diff --git a/Core/Graphics/Mesh.cpp b/Core/Graphics/Mesh.cpp
@@ -1,6 +1,15 @@
 #include "Mesh.h"
 #define TINYOBJLOADER_IMPLEMENTATION
-#include <tiny_obj_loader.h>
+// tinyobjloader uses NULL instead of nullptr for pointers, 
+// which can cause issues on Linux and macOS. The code below 
+// temporarily redefines NULL as nullptr to ensure compatibility.
+#if defined(__linux__) || defined(__APPLE__)
+	#define NULL nullptr
+	#include <tiny_obj_loader.h>
+	#undef NULL
+#else
+	#include <tiny_obj_loader.h>
+#endif
 
 namespace CGL::Graphics
 {
diff --git a/Core/Graphics/Mesh.h b/Core/Graphics/Mesh.h
@@ -10,8 +10,8 @@ namespace CGL::Graphics
 
 	struct MeshData
 	{
-		VertexBuffer VertexBuffer;
-		IndexBuffer IndexBuffer;
+		VertexBuffer VBuffer;
+		IndexBuffer IBuffer;
 	};
 
 
diff --git a/Core/Graphics/RHI/OpenGL/OPENGLRenderer.cpp b/Core/Graphics/RHI/OpenGL/OPENGLRenderer.cpp
@@ -185,6 +185,19 @@ namespace CGL::Graphics
 			{
 				OPENGLEnableVertexAttributes<VertexTypes::PositionColor>();
 			}
+			else if (source.VertexType == typeid(VertexTypes::PositionTexture))
+			{
+				OPENGLEnableVertexAttributes<VertexTypes::PositionTexture>();
+			}
+			else if (source.VertexType == typeid(VertexTypes::PositionColorTexture))
+			{
+				OPENGLEnableVertexAttributes<VertexTypes::PositionColorTexture>();
+			}
+			else if (source.VertexType == typeid(VertexTypes::PositionNormalTexture))
+			{
+				OPENGLEnableVertexAttributes<VertexTypes::PositionNormalTexture>();
+			}
+
 			glBindVertexArray(0);       
 
 			return vb;
diff --git a/Core/Graphics/RHI/OpenGL/OPENGLVertexAttributes.cpp b/Core/Graphics/RHI/OpenGL/OPENGLVertexAttributes.cpp
@@ -38,4 +38,93 @@ namespace CGL::Graphics
             (void*)offsetof(Graphics::VertexTypes::PositionColor, Color)
         );
     }
+
+    template <>
+    void OPENGLEnableVertexAttributes<VertexTypes::PositionTexture>() {
+        glEnableVertexAttribArray(0); // Position Attribute
+        glVertexAttribPointer(
+            0,
+            sizeof(Graphics::VertexTypes::PositionTexture::Position) / sizeof(float),
+            GL_FLOAT,
+            GL_FALSE,
+            sizeof(Graphics::VertexTypes::PositionTexture),
+            (void*)offsetof(Graphics::VertexTypes::PositionTexture, Position)
+        );
+
+        glEnableVertexAttribArray(1); // Texture Attribute
+        glVertexAttribPointer(
+            1,
+            sizeof(Graphics::VertexTypes::PositionTexture::Texture) / sizeof(float),
+            GL_FLOAT,
+            GL_FALSE,
+            sizeof(Graphics::VertexTypes::PositionTexture),
+            (void*)offsetof(Graphics::VertexTypes::PositionTexture, Texture)
+        );
+    }
+
+    template <>
+    void OPENGLEnableVertexAttributes<VertexTypes::PositionColorTexture>() {
+        glEnableVertexAttribArray(0); // Position Attribute
+        glVertexAttribPointer(
+            0,
+            sizeof(Graphics::VertexTypes::PositionColorTexture::Position) / sizeof(float),
+            GL_FLOAT,
+            GL_FALSE,
+            sizeof(Graphics::VertexTypes::PositionColorTexture),
+            (void*)offsetof(Graphics::VertexTypes::PositionColorTexture, Position)
+        );
+
+        glEnableVertexAttribArray(1); // Color Attribute
+        glVertexAttribPointer(
+            1,
+            sizeof(Graphics::VertexTypes::PositionColorTexture::Color) / sizeof(float),
+            GL_FLOAT,
+            GL_FALSE,
+            sizeof(Graphics::VertexTypes::PositionColorTexture),
+            (void*)offsetof(Graphics::VertexTypes::PositionColorTexture, Color)
+        );
+
+        glEnableVertexAttribArray(2); // Texture Attribute
+        glVertexAttribPointer(
+            2,
+            sizeof(Graphics::VertexTypes::PositionColorTexture::Texture) / sizeof(float),
+            GL_FLOAT,
+            GL_FALSE,
+            sizeof(Graphics::VertexTypes::PositionColorTexture),
+            (void*)offsetof(Graphics::VertexTypes::PositionColorTexture, Texture)
+        );
+    }
+
+    template <>
+    void OPENGLEnableVertexAttributes<VertexTypes::PositionNormalTexture>() {
+        glEnableVertexAttribArray(0); // Position Attribute
+        glVertexAttribPointer(
+            0,
+            sizeof(Graphics::VertexTypes::PositionNormalTexture::Position) / sizeof(float),
+            GL_FLOAT,
+            GL_FALSE,
+            sizeof(Graphics::VertexTypes::PositionNormalTexture),
+            (void*)offsetof(Graphics::VertexTypes::PositionNormalTexture, Position)
+        );
+
+        glEnableVertexAttribArray(1); // Normal Attribute
+        glVertexAttribPointer(
+            1,
+            sizeof(Graphics::VertexTypes::PositionNormalTexture::Normal) / sizeof(float),
+            GL_FLOAT,
+            GL_FALSE,
+            sizeof(Graphics::VertexTypes::PositionNormalTexture),
+            (void*)offsetof(Graphics::VertexTypes::PositionNormalTexture, Normal)
+        );
+
+        glEnableVertexAttribArray(2); // Texture Attribute
+        glVertexAttribPointer(
+            2,
+            sizeof(Graphics::VertexTypes::PositionNormalTexture::Texture) / sizeof(float),
+            GL_FLOAT,
+            GL_FALSE,
+            sizeof(Graphics::VertexTypes::PositionNormalTexture),
+            (void*)offsetof(Graphics::VertexTypes::PositionNormalTexture, Texture)
+        );
+    }
 }
diff --git a/Core/Graphics/RHI/OpenGL/OPENGLVertexAttributes.h b/Core/Graphics/RHI/OpenGL/OPENGLVertexAttributes.h
@@ -19,4 +19,7 @@ namespace CGL::Graphics
 
 	template <>
 	void OPENGLEnableVertexAttributes<VertexTypes::PositionColorTexture>();
+	
+	template <>
+	void OPENGLEnableVertexAttributes<VertexTypes::PositionNormalTexture>();
 }
diff --git a/Samples/ModelLoading/Assets/OpenGL/ModelLoadingPS.frag b/Samples/ModelLoading/Assets/OpenGL/ModelLoadingPS.frag
@@ -0,0 +1,11 @@
+#version 460 core
+
+in vec3 vColor;
+in vec3 vNormal;
+
+out vec4 outColor;
+
+void main()
+{
+    outColor = vec4(vNormal, 1.0);
+}
diff --git a/Samples/ModelLoading/Assets/OpenGL/ModelLoadingVS.vert b/Samples/ModelLoading/Assets/OpenGL/ModelLoadingVS.vert
@@ -0,0 +1,27 @@
+#version 460 core
+
+layout(std140, binding = 0) uniform Matrices
+{
+    mat4 WorldMatrix;
+    mat4 ViewMatrix;
+    mat4 ProjMatrix;
+};
+
+layout(location = 0) in vec3 inPosition;
+layout(location = 1) in vec3 inNormal;
+layout(location = 2) in vec3 inColor;
+
+out vec3 vColor;
+out vec3 vNormal;
+
+void main()
+{
+    vec4 position = vec4(inPosition, 1.0);
+    position = WorldMatrix * position;
+    position = ViewMatrix * position;
+    position = ProjMatrix * position;
+
+    gl_Position = position;
+    vNormal = inNormal;
+    vColor = inColor;
+}
diff --git a/Samples/ModelLoading/ModelLoading.cpp b/Samples/ModelLoading/ModelLoading.cpp
@@ -1,21 +1,31 @@
 #include "ModelLoading.h"
 #include <Core/Application/AssetFinder.h>
 
+#if defined(CGL_RHI_OPENGL) || defined(CGL_RHI_VULKAN)
+	#define CGL_UPLOAD_MATRIX(mat) mat
+#else
+	#define CGL_UPLOAD_MATRIX(mat) mat.Transpose()
+#endif
+
 namespace CGL
 {
 	CGL_DEFINE_LOG_CATEGORY(ModelLoading);
 
 	static constexpr byte s_vertexShader[] =
 	{
 #if defined(CGL_RHI_DX11)
-		#include "ModelLoadingVS.hlsl.h"		
+		#include "ModelLoadingVS.hlsl.h"	
+#elif defined(CGL_RHI_OPENGL)
+		#include "ModelLoadingVS.vert.h"
 #endif
 	};
 
 	static constexpr byte s_pixelShader[] =
 	{
 #if defined(CGL_RHI_DX11)
-		#include "ModelLoadingPS.hlsl.h"		
+		#include "ModelLoadingPS.hlsl.h"	
+#elif defined(CGL_RHI_OPENGL)
+		#include "ModelLoadingPS.frag.h"
 #endif	
 	};
 
@@ -94,15 +104,16 @@ namespace CGL
 			vbs.Type              = Graphics::BufferType::Vertex;
 			vbs.TypeSize          = sizeof(decltype(vb)::value_type);
 			vbs.Count             = u32(vb.size());
-			meshData.VertexBuffer = GetRenderer()->CreateVertexBuffer(vbs);
+			vbs.VertexType = typeid(decltype(vb)::value_type);
+			meshData.VBuffer = GetRenderer()->CreateVertexBuffer(vbs);
 
 			// Create index buffer
 			Graphics::BufferSource ibs;			
 			ibs.Data             = (void*)indices.data();
 			ibs.Type             = Graphics::BufferType::Index;
 			ibs.TypeSize         = sizeof(u32);
 			ibs.Count            = u32(indices.size());
-			meshData.IndexBuffer = GetRenderer()->CreateIndexBuffer(ibs);
+			meshData.IBuffer = GetRenderer()->CreateIndexBuffer(ibs);
 		}
 
 		// Create constant buffer
@@ -122,14 +133,14 @@ namespace CGL
 	}
 
 	f32 time = 0.0f;
-	void ModelLoading::OnUpdate([[maybe_unused]] const SDL_Event& e)
+	void ModelLoading::OnUpdate([[maybe_unused]] const SDL_Event& e, f32 deltaTime)
 	{
-		time += 0.0001f;
+		time += deltaTime;
 		FrameData data
 		{
-			.World = SM::Matrix::CreateRotationY(time),
-			.View = m_camera.GetViewMatrix().Transpose(),
-			.Projection = m_camera.GetProjectionMatrix().Transpose()
+			.World = CGL_UPLOAD_MATRIX(SM::Matrix::CreateRotationY(time).Transpose()),
+			.View = CGL_UPLOAD_MATRIX(m_camera.GetViewMatrix()),
+			.Projection = CGL_UPLOAD_MATRIX(m_camera.GetProjectionMatrix())
 		};
 
 		GetRenderer()->SetConstantBufferData(m_constantBuffer, data);
@@ -144,10 +155,10 @@ namespace CGL
 		for (auto& subMesh : m_mesh.SubMeshes)
 		{
 			auto& meshData = subMesh.GetMeshData();
-			GetRenderer()->SetVertexBuffer(meshData.VertexBuffer);
-			GetRenderer()->SetIndexBuffer(meshData.IndexBuffer);
+			GetRenderer()->SetVertexBuffer(meshData.VBuffer);
+			GetRenderer()->SetIndexBuffer(meshData.IBuffer);
 
-			GetRenderer()->DrawIndexed(meshData.IndexBuffer.IndicesCount);
+			GetRenderer()->DrawIndexed(meshData.IBuffer.IndicesCount);
 		}
 	}
 
diff --git a/Samples/ModelLoading/ModelLoading.h b/Samples/ModelLoading/ModelLoading.h
@@ -26,7 +26,7 @@ namespace CGL
 
 	private:
 		bool OnInit() override final;
-		void OnUpdate(const SDL_Event& e) override final;
+		void OnUpdate(const SDL_Event& e, f32 deltaTime) override final;
 		void OnRender() override final;
 		void OnResize(u32 width, u32 height) override final;
 		void OnShutdown() override final;
diff --git a/Samples/ModelLoading/xmake.lua b/Samples/ModelLoading/xmake.lua
@@ -8,7 +8,7 @@ target("ModelLoading")
 	set_group("Samples")
 
     add_rules("RHICompat", "CopyOBJ")
-	add_packages("libsdl", "tinyobjloader")
+	add_packages("libsdl", "directxmath", "tinyobjloader")
 
 	add_includedirs("..", "$(projectdir)")
 	add_files("**.cpp")
@@ -35,7 +35,9 @@ target("ModelLoading")
 			add_files("Assets/**.hlsl")
 		elseif rhi == "VULKAN" or rhi == "OPENGL" then
 			add_rules("utils.bin2c", { extensions = { ".vert", ".frag" } })
-			add_files("Assets/**.vert", "Assets/**.frag")
+			if rhi == "OPENGL" then
+				add_files("Assets/OpenGL/**.vert", "Assets/OpenGL/**.frag")
+			end
 		elseif rhi == "METAL" then
 			add_rules("utils.bin2c", { extensions = { ".metal" } })
 			add_files("Assets/**.metal")
diff --git a/Samples/SpinningCube/Assets/OpenGL/SpinningCubeVS.vert b/Samples/SpinningCube/Assets/OpenGL/SpinningCubeVS.vert
@@ -15,6 +15,7 @@ out vec3 fragColor;
 void main()
 {
     vec4 position = vec4(inPosition, 1.0);
+
     position = WorldMatrix * position;
     position = ViewMatrix * position;
     position = ProjMatrix * position;

Original file line number	Diff line number	Diff line change
`@@ -10,8 +10,8 @@ namespace CGL::Graphics`
`10`	`10`
`11`	`11`	`struct MeshData`
`12`	`12`	`{`
`13`		`- VertexBuffer VertexBuffer;`
`14`		`- IndexBuffer IndexBuffer;`
	`13`	`+ VertexBuffer VBuffer;`
	`14`	`+ IndexBuffer IBuffer;`
`15`	`15`	`};`
`16`	`16`
`17`	`17`
Original file line number	Diff line number	Diff line change
`@@ -19,4 +19,7 @@ namespace CGL::Graphics`
`19`	`19`
`20`	`20`	`template <>`
`21`	`21`	`void OPENGLEnableVertexAttributes<VertexTypes::PositionColorTexture>();`
	`22`	`+`
	`23`	`+ template <>`
	`24`	`+ void OPENGLEnableVertexAttributes<VertexTypes::PositionNormalTexture>();`
`22`	`25`	`}`
Original file line number	Diff line number	Diff line change
`@@ -15,6 +15,7 @@ out vec3 fragColor;`
`15`	`15`	`void main()`
`16`	`16`	`{`
`17`	`17`	`vec4 position = vec4(inPosition, 1.0);`
	`18`	`+`
`18`	`19`	`position = WorldMatrix * position;`
`19`	`20`	`position = ViewMatrix * position;`
`20`	`21`	`position = ProjMatrix * position;`