360 lines
12 KiB
C++
360 lines
12 KiB
C++
#include "RenderManager.h"
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#include <fstream>
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#include "Texture.h"
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RenderManager::RenderManager(SDL_Window *window)
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{
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_window = window;
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// 创建OpenGL上下文
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_ctx = SDL_GL_CreateContext(window);
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if (!_ctx)
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{
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SDL_LogError(SDL_LOG_CATEGORY_ERROR, "GL context create failed: %s\n", SDL_GetError());
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}
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// 初始化GLAD
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if (!gladLoadGLES2Loader((GLADloadproc)SDL_GL_GetProcAddress))
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{
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SDL_LogError(SDL_LOG_CATEGORY_ERROR, "GLAD init failed!\n");
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}
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// 获取窗口大小
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int width, height;
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SDL_GetWindowSize(window, &width, &height);
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// 设置视口
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glViewport(0, 0, width, height);
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// 设置窗口尺寸
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_windowWidth = width;
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_windowHeight = height;
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// 设置正交投影矩阵
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_orthoMatrix = glm::ortho(0.0f, (float)width, (float)height, 0.0f, -1.0f, 1.0f);
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// 设置清屏颜色
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glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
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// 启用混合模式
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glEnable(GL_BLEND);
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// 默认设置标准alpha混合
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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// 初始化着色器程序
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InitShaderProgram();
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// 初始化绘制2D纹理缓冲程序
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Init2DTextureProgram();
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// 设定默认使用的着色器程序和缓冲程序
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SetCurrentShaderProgram("normal");
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SetCurrentBufferObject("2DTexture");
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}
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RenderManager::~RenderManager()
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{
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// 释放着色器程序
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for (auto &[name, program] : _shaderProgramMap)
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{
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glDeleteProgram(program);
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}
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// 释放缓冲对象
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for (auto &[name, program] : _RenderParamsMap)
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{
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glDeleteVertexArrays(1, &program.VAO);
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glDeleteBuffers(1, &program.VBO);
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glDeleteBuffers(1, &program.EBO);
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}
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// 释放OpenGL上下文
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SDL_GL_DeleteContext(_ctx);
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}
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void RenderManager::InitShaderProgram()
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{
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std::ifstream shaderFile("shader/config.json");
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nlohmann::json shaderConfig;
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shaderFile >> shaderConfig;
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for (auto &[groupName, groupData] : shaderConfig["shader"].items())
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{
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if (!groupData.is_object())
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{
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SDL_LogError(SDL_LOG_CATEGORY_ERROR, "着色器组 %s 格式错误，跳过\n", groupName.c_str());
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continue;
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}
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if (!groupData.contains("vertex") || !groupData["vertex"].is_string())
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{
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SDL_LogError(SDL_LOG_CATEGORY_ERROR, "组 %s 缺少 vertex 路径，跳过\n", groupName.c_str());
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continue;
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}
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if (!groupData.contains("fragment") || !groupData["fragment"].is_string())
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{
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SDL_LogError(SDL_LOG_CATEGORY_ERROR, "组 %s 缺少 fragment 路径，跳过\n", groupName.c_str());
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continue;
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}
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std::string vertPath = groupData["vertex"].get<std::string>();
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std::string fragPath = groupData["fragment"].get<std::string>();
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GLuint vertexShader = CompileShader(GL_VERTEX_SHADER, vertPath);
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GLuint fragmentShader = CompileShader(GL_FRAGMENT_SHADER, fragPath);
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if (vertexShader == 0 || fragmentShader == 0)
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{
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SDL_LogError(SDL_LOG_CATEGORY_ERROR, "组 %s 着色器编译失败，跳过\n", groupName.c_str());
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continue;
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}
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GLuint program = glCreateProgram();
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glAttachShader(program, vertexShader);
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glAttachShader(program, fragmentShader);
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glLinkProgram(program);
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GLint programLinksuccess;
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glGetProgramiv(program, GL_LINK_STATUS, &programLinksuccess);
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if (!programLinksuccess)
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{
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char infoLog[512];
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glGetProgramInfoLog(program, 512, nullptr, infoLog);
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SDL_LogError(SDL_LOG_CATEGORY_ERROR, "组 %s 着色器链接失败，失败原因: %s\n", groupName.c_str(), infoLog);
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}
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_shaderProgramMap[groupName] = program;
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glDeleteShader(vertexShader);
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glDeleteShader(fragmentShader);
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}
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}
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void RenderManager::Init2DTextureProgram()
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{
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// 初始化顶点数据（矩形的四个顶点）
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float vertices[] = {
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0.0f, 0.0f, 0.0f, 0.0f, // 左下（单位坐标）
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1.0f, 0.0f, 1.0f, 0.0f, // 右下
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1.0f, 1.0f, 1.0f, 1.0f, // 右上
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0.0f, 1.0f, 0.0f, 1.0f // 左上
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};
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// 索引数组
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unsigned int indices[] = {0, 1, 2, 2, 3, 0};
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GLuint VAO, VBO, EBO;
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// 创建VAO/VBO/EBO
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glGenVertexArrays(1, &VAO);
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glGenBuffers(1, &VBO);
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glGenBuffers(1, &EBO);
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glBindVertexArray(VAO);
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glBindBuffer(GL_ARRAY_BUFFER, VBO);
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glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_DYNAMIC_DRAW);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
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glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_DYNAMIC_DRAW);
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glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void *)0);
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glEnableVertexAttribArray(0);
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glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void *)(2 * sizeof(float)));
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glEnableVertexAttribArray(1);
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// 创建完解绑
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glBindVertexArray(0);
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SetCurrentShaderProgram("normal");
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glUseProgram(_currentShaderProgram);
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// 获取uniform变量位置
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GLuint _uModelLoc = glGetUniformLocation(_currentShaderProgram, "uModel");
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GLuint _uViewProjLoc = glGetUniformLocation(_currentShaderProgram, "uViewProj");
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GLuint _uTextureLoc = glGetUniformLocation(_currentShaderProgram, "uTexture");
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if (_uModelLoc == -1 || _uViewProjLoc == -1 || _uTextureLoc == -1)
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{
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SDL_LogError(SDL_LOG_CATEGORY_ERROR, "无法获取着色器 uniform 变量位置\n");
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}
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std::vector<GLuint> uniformLocs = {_uModelLoc, _uViewProjLoc, _uTextureLoc};
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DrawLogicFunc drawFunc = [this](
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RefPtr<Texture> textureObj, const SDL_Rect *srcrect, const SDL_FRect *dstrect, const double angle, const SDL_FPoint *center, const SDL_RendererFlip flip, void *userdata)
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{
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GLuint texture = textureObj->getID();
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if (!texture || !dstrect)
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return;
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glUseProgram(_currentShaderProgram);
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glm::mat4 model = glm::mat4(1.0f);
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// 平移
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model = glm::translate(model, glm::vec3(dstrect->x, dstrect->y, 0.0f));
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// 计算旋转中心
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float centerX = center ? center->x : dstrect->w * 0.5f;
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float centerY = center ? center->y : dstrect->h * 0.5f;
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// 旋转中心平移
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model = glm::translate(model, glm::vec3(centerX, centerY, 0.0f));
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// 旋转
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if (angle != 0.0)
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{
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model = glm::rotate(model, glm::radians(static_cast<float>(angle)), glm::vec3(0.0f, 0.0f, 1.0f));
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}
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// 旋转中心平移
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model = glm::translate(model, glm::vec3(-centerX, -centerY, 0.0f));
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// 缩放和翻转
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float scaleX = dstrect->w;
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float scaleY = dstrect->h;
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// 应用翻转（通过负缩放实现）
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if (flip & SDL_FLIP_HORIZONTAL)
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scaleX = -scaleX;
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if (flip & SDL_FLIP_VERTICAL)
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scaleY = -scaleY;
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model = glm::scale(model, glm::vec3(scaleX, scaleY, 1.0f));
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// 翻转后的位置补偿
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if (flip & SDL_FLIP_HORIZONTAL)
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{
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model = glm::translate(model, glm::vec3(-1.0f, 0.0f, 0.0f));
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}
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if (flip & SDL_FLIP_VERTICAL)
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{
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model = glm::translate(model, glm::vec3(0.0f, -1.0f, 0.0f));
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}
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// 设置着色器 uniforms
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glUniformMatrix4fv(_currentRenderParams.UnimLocs[0], 1, GL_FALSE, glm::value_ptr(model));
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glUniformMatrix4fv(_currentRenderParams.UnimLocs[1], 1, GL_FALSE, glm::value_ptr(_orthoMatrix));
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// 绑定纹理并设置采样器
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, texture);
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glUniform1i(_currentRenderParams.UnimLocs[2], 0);
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// 处理纹理裁剪
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int texWidth = textureObj->getSize().width;
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int texHeight = textureObj->getSize().height;
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// 计算纹理坐标
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float minu, minv, maxu, maxv;
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if (srcrect)
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{
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minu = (float)srcrect->x / texWidth;
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minv = (float)srcrect->y / texHeight;
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maxu = (float)(srcrect->x + srcrect->w) / texWidth;
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maxv = (float)(srcrect->y + srcrect->h) / texHeight;
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}
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else
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{
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minu = 0.0f;
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minv = 0.0f;
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maxu = 1.0f;
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maxv = 1.0f;
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}
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// 计算顶点位置（单位矩形，通过模型变换进行缩放和平移）
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float minx = 0.0f;
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float miny = 0.0f;
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float maxx = 1.0f;
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float maxy = 1.0f;
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// 创建顶点数据（位置 + 纹理坐标）
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float vertices[] = {
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// 位置 // 纹理坐标
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minx, miny, minu, minv, // 左上
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maxx, miny, maxu, minv, // 右上
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maxx, maxy, maxu, maxv, // 右下
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minx, maxy, minu, maxv // 左下
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};
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// 更新VBO数据
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glBindBuffer(GL_ARRAY_BUFFER, _currentRenderParams.VBO);
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glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_DYNAMIC_DRAW);
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// 绘制纹理
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glBindVertexArray(_currentRenderParams.VAO);
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glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
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glBindVertexArray(0);
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};
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GL_RenderParams bufferObject = {VAO, VBO, EBO, uniformLocs, drawFunc};
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AddBufferObject("2DTexture", bufferObject);
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}
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void RenderManager::SetCurrentShaderProgram(std::string name)
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{
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if (_shaderProgramMap.find(name) != _shaderProgramMap.end())
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{
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this->_currentShaderProgram = _shaderProgramMap[name];
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}
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else
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SDL_LogError(SDL_LOG_CATEGORY_ERROR, "找不到着色器程序: %s\n", name.c_str());
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}
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void RenderManager::SetCurrentBufferObject(std::string name)
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{
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if (_RenderParamsMap.find(name) != _RenderParamsMap.end())
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{
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this->_currentRenderParams = _RenderParamsMap[name];
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}
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else
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SDL_LogError(SDL_LOG_CATEGORY_ERROR, "找不到渲染参数: %s\n", name.c_str());
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}
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void RenderManager::ClearScreen()
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{
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glClear(GL_COLOR_BUFFER_BIT);
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}
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void RenderManager::SwapBuffer()
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{
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SDL_GL_SwapWindow(_window);
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}
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void RenderManager::SetClipRect(const SDL_Rect *rect)
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{
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glEnable(GL_SCISSOR_TEST);
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glScissor(rect->x, _windowHeight - rect->y - rect->h, rect->w, rect->h);
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}
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void RenderManager::CloseClipRect()
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{
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glDisable(GL_SCISSOR_TEST);
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}
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void RenderManager::DrawTexture(RefPtr<Texture> textureObj, const SDL_Rect *srcrect, const SDL_FRect *dstrect, const double angle, const SDL_FPoint *center, const SDL_RendererFlip flip, void *userdata)
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{
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if (_currentRenderParams.DrawFunc != nullptr)
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_currentRenderParams.DrawFunc(textureObj, srcrect, dstrect, angle, center, flip, userdata);
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else
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SDL_LogError(SDL_LOG_CATEGORY_ERROR, "找不到渲染逻辑函数\n");
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}
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GLuint RenderManager::CompileShader(GLenum type, std::string Path)
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{
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std::ifstream Source("shader/" + Path);
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if (!Source.is_open())
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{
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SDL_LogError(0, "Failed to open shader file: %s\n", Path.c_str());
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return 0;
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}
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std::string ShaderSource((std::istreambuf_iterator<char>(Source)), std::istreambuf_iterator<char>());
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const char *SourcePtr = ShaderSource.c_str();
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GLuint ShaderId = glCreateShader(type);
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glShaderSource(ShaderId, 1, &SourcePtr, NULL);
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glCompileShader(ShaderId);
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// 检查编译错误
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GLint success;
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glGetShaderiv(ShaderId, GL_COMPILE_STATUS, &success);
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if (!success)
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{
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char infoLog[512];
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glGetShaderInfoLog(ShaderId, 512, nullptr, infoLog);
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SDL_LogError(SDL_LOG_CATEGORY_ERROR, "Shader compile error: %s\n", infoLog);
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glDeleteShader(ShaderId);
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return 0;
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}
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return ShaderId;
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}
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void RenderManager::AddBufferObject(std::string name, GL_RenderParams bufferObject)
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{
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_RenderParamsMap[name] = bufferObject;
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}
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