migrat a OpenGL 3.3 Core Profile

source/rendering/opengl/opengl_shader.h

@@ -0,0 +1,98 @@
+#pragma once
+
+#include "../shader_backend.h"
+
+#ifdef __APPLE__
+#include <OpenGL/gl3.h>
+#else
+#include <SDL3/SDL_opengl.h>
+#endif
+
+namespace Rendering {
+
+/**
+ * @brief Backend de shaders usando OpenGL 3.3 Core Profile
+ *
+ * Implementa el renderizado de shaders usando APIs modernas de OpenGL:
+ * - VAO (Vertex Array Objects)
+ * - VBO (Vertex Buffer Objects)
+ * - Shaders GLSL #version 330 core
+ */
+class OpenGLShader : public ShaderBackend {
+public:
+    OpenGLShader() = default;
+    ~OpenGLShader() override;
+
+    bool init(SDL_Window* window,
+             SDL_Texture* texture,
+             const std::string& vertex_source,
+             const std::string& fragment_source) override;
+
+    void render() override;
+    void setTextureSize(float width, float height) override;
+    void cleanup() override;
+    bool isHardwareAccelerated() const override { return is_initialized_; }
+
+private:
+    // Funciones auxiliares
+    bool initGLExtensions();
+    GLuint compileShader(const std::string& source, GLenum shader_type);
+    GLuint linkProgram(GLuint vertex_shader, GLuint fragment_shader);
+    void createQuadGeometry();
+    GLuint getTextureID(SDL_Texture* texture);
+    void checkGLError(const char* operation);
+
+    // Estado SDL
+    SDL_Window* window_ = nullptr;
+    SDL_Renderer* renderer_ = nullptr;
+    SDL_Texture* back_buffer_ = nullptr;
+
+    // Estado OpenGL
+    GLuint program_id_ = 0;
+    GLuint vao_ = 0;  // Vertex Array Object
+    GLuint vbo_ = 0;  // Vertex Buffer Object
+    GLuint ebo_ = 0;  // Element Buffer Object
+
+    // Ubicaciones de uniforms
+    GLint texture_size_location_ = -1;
+
+    // Tamaños
+    int window_width_ = 0;
+    int window_height_ = 0;
+    float texture_width_ = 0.0f;
+    float texture_height_ = 0.0f;
+
+    // Estado
+    bool is_initialized_ = false;
+
+#ifndef __APPLE__
+    // Punteros a funciones OpenGL en Windows/Linux
+    PFNGLCREATESHADERPROC glCreateShader = nullptr;
+    PFNGLSHADERSOURCEPROC glShaderSource = nullptr;
+    PFNGLCOMPILESHADERPROC glCompileShader = nullptr;
+    PFNGLGETSHADERIVPROC glGetShaderiv = nullptr;
+    PFNGLGETSHADERINFOLOGPROC glGetShaderInfoLog = nullptr;
+    PFNGLDELETESHADERPROC glDeleteShader = nullptr;
+    PFNGLATTACHSHADERPROC glAttachShader = nullptr;
+    PFNGLCREATEPROGRAMPROC glCreateProgram = nullptr;
+    PFNGLLINKPROGRAMPROC glLinkProgram = nullptr;
+    PFNGLVALIDATEPROGRAMPROC glValidateProgram = nullptr;
+    PFNGLGETPROGRAMIVPROC glGetProgramiv = nullptr;
+    PFNGLGETPROGRAMINFOLOGPROC glGetProgramInfoLog = nullptr;
+    PFNGLUSEPROGRAMPROC glUseProgram = nullptr;
+    PFNGLDELETEPROGRAMPROC glDeleteProgram = nullptr;
+    PFNGLGETUNIFORMLOCATIONPROC glGetUniformLocation = nullptr;
+    PFNGLUNIFORM2FPROC glUniform2f = nullptr;
+    PFNGLGENVERTEXARRAYSPROC glGenVertexArrays = nullptr;
+    PFNGLBINDVERTEXARRAYPROC glBindVertexArray = nullptr;
+    PFNGLDELETEVERTEXARRAYSPROC glDeleteVertexArrays = nullptr;
+    PFNGLGENBUFFERSPROC glGenBuffers = nullptr;
+    PFNGLBINDBUFFERPROC glBindBuffer = nullptr;
+    PFNGLBUFFERDATAPROC glBufferData = nullptr;
+    PFNGLDELETEBUFFERSPROC glDeleteBuffers = nullptr;
+    PFNGLVERTEXATTRIBPOINTERPROC glVertexAttribPointer = nullptr;
+    PFNGLENABLEVERTEXATTRIBARRAYPROC glEnableVertexAttribArray = nullptr;
+#endif
+};
+
+} // namespace Rendering