render_utils.h

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#ifndef RENDER_UTILS_H
#define RENDER_UTILS_H
 
#include "gl_common.h"
#include <stddef.h>
 
// -----------------------------------------------------------------------------
// Texture Management
// -----------------------------------------------------------------------------
 
GLuint render_utils_create_color_texture(float red, float green, float blue,
                                         float alpha);
 
void render_utils_bind_texture_safe(GLenum unit, GLuint texture,
                                    GLuint fallback_tex);
 
void render_utils_reset_texture_units(int start_unit, int end_unit,
                                      GLuint fallback_tex);
 
// -----------------------------------------------------------------------------
// Geometry Helpers
// -----------------------------------------------------------------------------
 
void render_utils_create_empty_vao(GLuint* vao);
 
void render_utils_create_quad_vbo(GLuint* vbo);
 
void render_utils_create_wire_cube_vbo(GLuint* vbo);
 
void render_utils_create_wire_quad_vbo(GLuint* vbo);
 
void render_utils_create_fullscreen_quad(GLuint* vao, GLuint* vbo);
 
// -----------------------------------------------------------------------------
// Debugging / Validation
// -----------------------------------------------------------------------------
 
typedef struct {
    const char*
        vendor; 
    const char* renderer; 
    const char* version;  
} GPUInfo;
 
GPUInfo render_utils_get_gpu_info(void);
 
void render_utils_generate_gpu_identifier(const char* vendor,
                                          const char* renderer, char* buffer,
                                          size_t size);
 
void render_utils_get_gpu_identifier(char* buffer, size_t size);
 
int render_utils_check_framebuffer(const char* label);
 
GLuint render_utils_create_texture_2d(int width, int height,
                                      GLenum internal_format, GLint levels,
                                      const char* label);
 
void render_utils_setup_sphere_instance_attributes(GLuint binding_point,
                                                   GLsizei stride,
                                                   size_t offset_albedo,
                                                   size_t offset_metallic,
                                                   size_t offset_prev_center);
 
// -----------------------------------------------------------------------------
// State Management
// -----------------------------------------------------------------------------
 
typedef struct {
    GLboolean depth_enabled;
    GLboolean blend_enabled;
    GLint polygon_mode[2];
} GLStateBackup;
 
GLStateBackup render_utils_save_state(void);
 
void render_utils_restore_state(const GLStateBackup* state);
 
void render_utils_setup_ui_state(void);
 
#endif  // RENDER_UTILS_H