Add OpenGLPipelineState and integrate into main.cpp

2026-03-16 18:25:58 +08:00
parent 430d23b719
commit 0be91748c2
4 changed files with 259 additions and 3 deletions
--- a/engine/src/RHI/OpenGL/OpenGLPipelineState.cpp
+++ b/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