184 lines
6.6 KiB
C++
184 lines
6.6 KiB
C++
#pragma once
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#include <extra2d/graphics/backends/opengl/gl_buffer.h>
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#include <extra2d/graphics/backends/opengl/gl_framebuffer.h>
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#include <extra2d/graphics/backends/opengl/gl_pipeline.h>
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#include <extra2d/graphics/backends/opengl/gl_sprite_batch.h>
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#include <extra2d/graphics/core/render_backend.h>
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#include <extra2d/graphics/shader/shader_interface.h>
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#include <array>
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#include <glad/glad.h>
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#include <vector>
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namespace extra2d {
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// 前向声明
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class IWindow;
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class GLContext;
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class GLFramebuffer;
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// ============================================================================
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// OpenGL 渲染器实现
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// ============================================================================
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class GLRenderer : public RenderBackend {
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public:
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GLRenderer();
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~GLRenderer() override;
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// RenderBackend 接口实现
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bool init(IWindow* window) override;
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void shutdown() override;
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void beginFrame(const Color &clearColor) override;
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void endFrame() override;
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void setViewport(int x, int y, int width, int height) override;
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void setVSync(bool enabled) override;
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void setBlendMode(BlendMode mode) override;
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void setViewProjection(const glm::mat4 &matrix) override;
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// 变换矩阵栈
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void pushTransform(const glm::mat4 &transform) override;
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void popTransform() override;
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glm::mat4 getCurrentTransform() const override;
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Ptr<Texture> createTexture(int width, int height, const uint8_t *pixels,
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int channels) override;
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Ptr<Texture> loadTexture(const std::string &filepath) override;
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void beginSpriteBatch() override;
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void drawSprite(const Texture &texture, const Rect &destRect,
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const Rect &srcRect, const Color &tint, float rotation,
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const Vec2 &anchor) override;
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void drawSprite(const Texture &texture, const Vec2 &position,
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const Color &tint) override;
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void endSpriteBatch() override;
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void flush() override;
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void drawLine(const Vec2 &start, const Vec2 &end, const Color &color,
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float width) override;
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void drawRect(const Rect &rect, const Color &color, float width) override;
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void fillRect(const Rect &rect, const Color &color) override;
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void drawCircle(const Vec2 ¢er, float radius, const Color &color,
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int segments, float width) override;
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void fillCircle(const Vec2 ¢er, float radius, const Color &color,
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int segments) override;
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void drawTriangle(const Vec2 &p1, const Vec2 &p2, const Vec2 &p3,
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const Color &color, float width) override;
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void fillTriangle(const Vec2 &p1, const Vec2 &p2, const Vec2 &p3,
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const Color &color) override;
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void drawPolygon(const std::vector<Vec2> &points, const Color &color,
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float width) override;
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void fillPolygon(const std::vector<Vec2> &points,
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const Color &color) override;
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Ptr<FontAtlas> createFontAtlas(const std::string &filepath, int fontSize,
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bool useSDF = false) override;
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void drawText(const FontAtlas &font, const std::string &text,
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const Vec2 &position, const Color &color) override;
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void drawText(const FontAtlas &font, const std::string &text, float x,
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float y, const Color &color) override;
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Stats getStats() const override { return stats_; }
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void resetStats() override;
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// GLFramebuffer 相关方法
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/**
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* @brief 创建帧缓冲对象
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* @param desc 帧缓冲描述
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* @return 创建的帧缓冲智能指针
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*/
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Ptr<GLFramebuffer> createFramebuffer(const FramebufferDesc& desc);
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/**
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* @brief 绑定帧缓冲（作为渲染目标）
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* @param framebuffer 帧缓冲对象指针，传入 nullptr 则绑定默认帧缓冲
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*/
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void bindFramebuffer(GLFramebuffer* framebuffer);
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/**
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* @brief 解绑帧缓冲（恢复到默认帧缓冲）
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*/
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void unbindFramebuffer();
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/**
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* @brief 获取默认帧缓冲
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* @return 默认帧缓冲智能指针
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*/
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Ptr<GLFramebuffer> getDefaultFramebuffer() const;
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/**
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* @brief 清除当前绑定的帧缓冲
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* @param color 清除颜色
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* @param clearColor 是否清除颜色缓冲
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* @param clearDepth 是否清除深度缓冲
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* @param clearStencil 是否清除模板缓冲
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*/
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void clearFramebuffer(const Color& color, bool clearColor = true,
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bool clearDepth = true, bool clearStencil = false);
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private:
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// 形状批处理常量
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static constexpr size_t MAX_CIRCLE_SEGMENTS = 128;
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static constexpr size_t MAX_SHAPE_VERTICES = 8192; // 最大形状顶点数
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static constexpr size_t MAX_LINE_VERTICES = 16384; // 最大线条顶点数
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// 形状顶点结构（包含颜色）
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struct ShapeVertex {
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float x, y;
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float r, g, b, a;
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};
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IWindow* window_;
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GLSpriteBatch spriteBatch_;
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Ptr<IShader> shapeShader_;
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Ptr<IShader> sdfFontShader_; // SDF字体专用着色器
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GLuint shapeVao_; // 形状 VAO（手动管理，用于顶点属性配置）
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GLBuffer shapeBuffer_; // 形状 VBO（使用 GLBuffer 管理）
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GLuint lineVao_; // 线条 VAO（手动管理，用于顶点属性配置）
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GLBuffer lineBuffer_; // 线条 VBO（使用 GLBuffer 管理）
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glm::mat4 viewProjection_;
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std::vector<glm::mat4> transformStack_;
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Stats stats_;
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bool vsync_;
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// 形状批处理缓冲区（预分配，避免每帧内存分配）
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std::array<ShapeVertex, MAX_SHAPE_VERTICES> shapeVertexCache_;
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size_t shapeVertexCount_ = 0;
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GLenum currentShapeMode_ = GL_TRIANGLES;
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// 线条批处理缓冲区
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std::array<ShapeVertex, MAX_LINE_VERTICES> lineVertexCache_;
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size_t lineVertexCount_ = 0;
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float currentLineWidth_ = 1.0f;
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// OpenGL 管线状态管理
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GLPipeline pipeline_;
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// 自动批处理状态
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bool batchActive_ = false; // 批处理是否激活
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bool autoBatchEnabled_ = true; // 是否启用自动批处理
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const Texture* currentBatchTexture_ = nullptr; // 当前批处理的纹理
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std::vector<SpriteData> pendingSprites_; // 待提交的精灵
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static constexpr size_t MAX_BATCH_SPRITES = 1000; // 最大批处理精灵数
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// 帧缓冲管理
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mutable Ptr<GLFramebuffer> defaultFramebuffer_; // 默认帧缓冲（延迟创建）
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GLFramebuffer* currentFramebuffer_ = nullptr; // 当前绑定的帧缓冲
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void initShapeRendering();
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void ensureBatchActive(); // 确保批处理已激活
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void submitPendingSprites(); // 提交待处理的精灵
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void flushShapeBatch();
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void flushLineBatch();
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void addShapeVertex(float x, float y, const Color &color);
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void addLineVertex(float x, float y, const Color &color);
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void submitShapeBatch(GLenum mode);
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};
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} // namespace extra2d
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