Add OpenGLPipelineState and integrate into main.cpp

engine/CMakeLists.txt

@@ -131,11 +131,13 @@ add_library(XCEngine STATIC
     include/XCEngine/RHI/OpenGL/OpenGLBuffer.h
     include/XCEngine/RHI/OpenGL/OpenGLVertexArray.h
     include/XCEngine/RHI/OpenGL/OpenGLTexture.h
+    include/XCEngine/RHI/OpenGL/OpenGLPipelineState.h
     src/RHI/OpenGL/OpenGLDevice.cpp
     src/RHI/OpenGL/OpenGLShader.cpp
     src/RHI/OpenGL/OpenGLBuffer.cpp
     src/RHI/OpenGL/OpenGLVertexArray.cpp
     src/RHI/OpenGL/OpenGLTexture.cpp
+    src/RHI/OpenGL/OpenGLPipelineState.cpp
 )
 
 target_include_directories(XCEngine PUBLIC

engine/include/XCEngine/RHI/OpenGL/OpenGLPipelineState.h

@@ -0,0 +1,100 @@
+#pragma once
+
+#include <GLFW/glfw3.h>
+
+namespace XCEngine {
+namespace RHI {
+
+enum class ComparisonFunc {
+    Never,
+    Less,
+    Equal,
+    LessEqual,
+    Greater,
+    NotEqual,
+    GreaterEqual,
+    Always
+};
+
+enum class BlendFactor {
+    Zero,
+    One,
+    SrcColor,
+    OneMinusSrcColor,
+    DstColor,
+    OneMinusDstColor,
+    SrcAlpha,
+    OneMinusSrcAlpha,
+    DstAlpha,
+    OneMinusDstAlpha,
+    ConstantColor,
+    OneMinusConstantColor,
+    ConstantAlpha,
+    OneMinusConstantAlpha
+};
+
+enum class CullFace {
+    Front,
+    Back,
+    FrontAndBack
+};
+
+enum class FrontFace {
+    Clockwise,
+    CounterClockwise
+};
+
+struct DepthStencilState {
+    bool depthTestEnable = true;
+    bool depthWriteEnable = true;
+    ComparisonFunc depthFunc = ComparisonFunc::Less;
+};
+
+struct BlendState {
+    bool blendEnable = false;
+    BlendFactor srcBlend = BlendFactor::SrcAlpha;
+    BlendFactor dstBlend = BlendFactor::OneMinusSrcAlpha;
+    BlendFactor srcBlendAlpha = BlendFactor::One;
+    BlendFactor dstBlendAlpha = BlendFactor::Zero;
+};
+
+struct RasterizerState {
+    bool cullFaceEnable = true;
+    CullFace cullFace = CullFace::Back;
+    FrontFace frontFace = FrontFace::CounterClockwise;
+    bool polygonModeFill = true;
+};
+
+struct ViewportState {
+    int x = 0;
+    int y = 0;
+    int width = 0;
+    int height = 0;
+    float minDepth = 0.0f;
+    float maxDepth = 1.0f;
+};
+
+class OpenGLPipelineState {
+public:
+    OpenGLPipelineState();
+    ~OpenGLPipelineState();
+
+    void SetDepthStencilState(const DepthStencilState& state);
+    void SetBlendState(const BlendState& state);
+    void SetRasterizerState(const RasterizerState& state);
+    void SetViewport(const ViewportState& state);
+
+    void Apply();
+    void SetClearColor(float r, float g, float b, float a);
+    void Clear(unsigned int buffers);
+
+private:
+    DepthStencilState m_depthStencilState;
+    BlendState m_blendState;
+    RasterizerState m_rasterizerState;
+    ViewportState m_viewportState;
+    float m_clearColor[4];
+};
+
+} // namespace RHI
+} // namespace XCEngine

engine/src/RHI/OpenGL/OpenGLPipelineState.cpp

@@ -0,0 +1,145 @@
+#define GLFW_INCLUDE_NONE
+#include "XCEngine/RHI/OpenGL/OpenGLPipelineState.h"
+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
+
+namespace XCEngine {
+namespace RHI {
+
+OpenGLPipelineState::OpenGLPipelineState() {
+    m_clearColor[0] = 0.1f;
+    m_clearColor[1] = 0.1f;
+    m_clearColor[2] = 0.1f;
+    m_clearColor[3] = 1.0f;
+}
+
+OpenGLPipelineState::~OpenGLPipelineState() {
+}
+
+void OpenGLPipelineState::SetDepthStencilState(const DepthStencilState& state) {
+    m_depthStencilState = state;
+}
+
+void OpenGLPipelineState::SetBlendState(const BlendState& state) {
+    m_blendState = state;
+}
+
+void OpenGLPipelineState::SetRasterizerState(const RasterizerState& state) {
+    m_rasterizerState = state;
+}
+
+void OpenGLPipelineState::SetViewport(const ViewportState& state) {
+    m_viewportState = state;
+}
+
+static unsigned int ToGLComparisonFunc(ComparisonFunc func) {
+    switch (func) {
+        case ComparisonFunc::Never: return GL_NEVER;
+        case ComparisonFunc::Less: return GL_LESS;
+        case ComparisonFunc::Equal: return GL_EQUAL;
+        case ComparisonFunc::LessEqual: return GL_LEQUAL;
+        case ComparisonFunc::Greater: return GL_GREATER;
+        case ComparisonFunc::NotEqual: return GL_NOTEQUAL;
+        case ComparisonFunc::GreaterEqual: return GL_GEQUAL;
+        case ComparisonFunc::Always: return GL_ALWAYS;
+        default: return GL_LESS;
+    }
+}
+
+static unsigned int ToGLBlendFactor(BlendFactor factor) {
+    switch (factor) {
+        case BlendFactor::Zero: return GL_ZERO;
+        case BlendFactor::One: return GL_ONE;
+        case BlendFactor::SrcColor: return GL_SRC_COLOR;
+        case BlendFactor::OneMinusSrcColor: return GL_ONE_MINUS_SRC_COLOR;
+        case BlendFactor::DstColor: return GL_DST_COLOR;
+        case BlendFactor::OneMinusDstColor: return GL_ONE_MINUS_DST_COLOR;
+        case BlendFactor::SrcAlpha: return GL_SRC_ALPHA;
+        case BlendFactor::OneMinusSrcAlpha: return GL_ONE_MINUS_SRC_ALPHA;
+        case BlendFactor::DstAlpha: return GL_DST_ALPHA;
+        case BlendFactor::OneMinusDstAlpha: return GL_ONE_MINUS_DST_ALPHA;
+        case BlendFactor::ConstantColor: return GL_CONSTANT_COLOR;
+        case BlendFactor::OneMinusConstantColor: return GL_ONE_MINUS_CONSTANT_COLOR;
+        case BlendFactor::ConstantAlpha: return GL_CONSTANT_ALPHA;
+        case BlendFactor::OneMinusConstantAlpha: return GL_ONE_MINUS_CONSTANT_ALPHA;
+        default: return GL_ONE;
+    }
+}
+
+static unsigned int ToGLCullFace(CullFace face) {
+    switch (face) {
+        case CullFace::Front: return GL_FRONT;
+        case CullFace::Back: return GL_BACK;
+        case CullFace::FrontAndBack: return GL_FRONT_AND_BACK;
+        default: return GL_BACK;
+    }
+}
+
+static unsigned int ToGLFrontFace(FrontFace face) {
+    switch (face) {
+        case FrontFace::Clockwise: return GL_CW;
+        case FrontFace::CounterClockwise: return GL_CCW;
+        default: return GL_CCW;
+    }
+}
+
+void OpenGLPipelineState::Apply() {
+    if (m_depthStencilState.depthTestEnable) {
+        glEnable(GL_DEPTH_TEST);
+        glDepthFunc(ToGLComparisonFunc(m_depthStencilState.depthFunc));
+        glDepthMask(m_depthStencilState.depthWriteEnable ? GL_TRUE : GL_FALSE);
+    } else {
+        glDisable(GL_DEPTH_TEST);
+    }
+
+    if (m_blendState.blendEnable) {
+        glEnable(GL_BLEND);
+        glBlendFunc(
+            ToGLBlendFactor(m_blendState.srcBlend),
+            ToGLBlendFactor(m_blendState.dstBlend)
+        );
+        glBlendFuncSeparate(
+            ToGLBlendFactor(m_blendState.srcBlend),
+            ToGLBlendFactor(m_blendState.dstBlend),
+            ToGLBlendFactor(m_blendState.srcBlendAlpha),
+            ToGLBlendFactor(m_blendState.dstBlendAlpha)
+        );
+    } else {
+        glDisable(GL_BLEND);
+    }
+
+    if (m_rasterizerState.cullFaceEnable) {
+        glEnable(GL_CULL_FACE);
+        glCullFace(ToGLCullFace(m_rasterizerState.cullFace));
+        glFrontFace(ToGLFrontFace(m_rasterizerState.frontFace));
+    } else {
+        glDisable(GL_CULL_FACE);
+    }
+
+    glViewport(
+        m_viewportState.x,
+        m_viewportState.y,
+        m_viewportState.width,
+        m_viewportState.height
+    );
+    glDepthRange(m_viewportState.minDepth, m_viewportState.maxDepth);
+}
+
+void OpenGLPipelineState::SetClearColor(float r, float g, float b, float a) {
+    m_clearColor[0] = r;
+    m_clearColor[1] = g;
+    m_clearColor[2] = b;
+    m_clearColor[3] = a;
+    glClearColor(r, g, b, a);
+}
+
+void OpenGLPipelineState::Clear(unsigned int buffers) {
+    unsigned int glBuffers = 0;
+    if (buffers & 0x1) glBuffers |= GL_COLOR_BUFFER_BIT;
+    if (buffers & 0x2) glBuffers |= GL_DEPTH_BUFFER_BIT;
+    if (buffers & 0x4) glBuffers |= GL_STENCIL_BUFFER_BIT;
+    glClear(glBuffers);
+}
+
+} // namespace RHI
+} // namespace XCEngine

tests/OpenGL/main.cpp

@@ -19,6 +19,7 @@
 #include "XCEngine/Debug/FileLogSink.h"
 #include "XCEngine/RHI/OpenGL/OpenGLShader.h"
 #include "XCEngine/RHI/OpenGL/OpenGLDevice.h"
+#include "XCEngine/RHI/OpenGL/OpenGLPipelineState.h"
 
 using namespace XCEngine::Debug;
 using namespace XCEngine::RHI;
@@ -262,6 +263,7 @@ private:
 Model* model = nullptr;
 OpenGLShader* shader = nullptr;
 OpenGLDevice* device = nullptr;
+OpenGLPipelineState* pipeline = nullptr;
 int frameCount = 0;
 
 void framebuffer_size_callback(GLFWwindow* window, int width, int height)
@@ -279,10 +281,17 @@ void Initialize()
 
 	Log("OpenGL Test Application Started");
 
+	pipeline = new OpenGLPipelineState();
+	ViewportState viewport;
+	viewport.width = SCR_WIDTH;
+	viewport.height = SCR_HEIGHT;
+	pipeline->SetViewport(viewport);
+	pipeline->SetClearColor(0.1f, 0.1f, 0.1f, 1.0f);
+	pipeline->Apply();
+
 	model = new Model("res/models/backpack/backpack.obj");
 	shader = new OpenGLShader();
 	shader->CompileFromFile("Shaders/vertexshader.glsl", "Shaders/fragmentshader.glsl");
-	glEnable(GL_DEPTH_TEST);
 
 	Log("Initialization complete");
 }
@@ -319,8 +328,7 @@ bool SaveScreenshot(const char* filename)
 
 void Render()
 {
-	glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
+	pipeline->Clear(3); // COLOR_BUFFER_BIT | DEPTH_BUFFER_BIT
-	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
 	shader->Use();
 
@@ -387,6 +395,7 @@ int main()
 
 	Log("Application closed");
 
+	delete pipeline;
 	delete device;
 	delete shader;
 	delete model;