ui.h

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#ifndef UI_H
#define UI_H
 
#define ASCII_CHAR_COUNT 96
 
#include "gl_common.h"
#include <cglm/cglm.h>
#include <stdbool.h>
 
typedef struct Shader Shader;
 
typedef struct {
    float x0, y0, x1, y1; 
    float w, h;           
    float x_off, y_off;   
    float advance;        
} GlyphInfo;
 
#define UI_MAX_BATCH_VERTICES 8192
 
typedef struct {
    float x, y;
    float u, v;
    float r, g, b, a;
    float mode;  // 0=solid, 1=text, 2=rounded
    float rect_size_x, rect_size_y;
    float radius;
} UIVertex;
 
typedef struct {
    GLuint texture; 
    Shader* shader; 
    Shader*
        spinner_shader; 
    GLuint vao, vbo;    
    GlyphInfo cdata[ASCII_CHAR_COUNT]; 
    float font_size;                   
    UIVertex batch_vertices[UI_MAX_BATCH_VERTICES]; 
    int batch_count;           
    int current_screen_width;  
    int current_screen_height; 
    bool batch_active;         
    GLuint current_texture;    
} UIContext;
 
typedef struct {
    UIContext* ui;     
    float start_x;     
    float cursor_y;    
    float padding;     
    int screen_width;  
    int screen_height; 
} UILayout;
 
int ui_init(UIContext* ui_context, const char* font_path, float font_size);
 
void ui_destroy(UIContext* ui_context);
 
/* --- Batch API --- */
 
void ui_begin(UIContext* ui_context, int screen_width, int screen_height);
 
void ui_flush(UIContext* ui_context);
 
void ui_end(UIContext* ui_context);
 
/* --- Layout API --- */
 
void ui_layout_init(UILayout* layout, UIContext* ui_ctx, float pos_x,
                    float pos_y, float padding, int screen_width,
                    int screen_height);
 
void ui_layout_text(UILayout* layout, const char* text, const vec3 color);
 
void ui_layout_separator(UILayout* layout, float space);
 
/* --- Low-level API --- */
 
void ui_draw_text(UIContext* ui_context, const char* text, float pos_x,
                  float pos_y, const vec3 color, int screen_width,
                  int screen_height);
 
float ui_measure_text(const UIContext* ui_context, const char* text);
 
void ui_draw_text_ex(UIContext* ui_context, const char* text, float pos_x,
                     float pos_y, const vec3 color, float alpha,
                     int screen_width, int screen_height);
 
void ui_draw_text_scaled(UIContext* ui_context, const char* text, float pos_x,
                         float pos_y, const vec3 color, float alpha,
                         float scale, int screen_width, int screen_height);
 
void ui_draw_rect(UIContext* ui_context, float rect_x, float rect_y,
                  float width, float height, const vec3 color, int screen_width,
                  int screen_height);
 
void ui_draw_rect_ex(UIContext* ui_context, float rect_x, float rect_y,
                     float width, float height, const vec3 color, float alpha,
                     int screen_width, int screen_height);
 
void ui_draw_spinner(UIContext* ui_context, float center_x, float center_y,
                     float size, float angle, const vec3 color,
                     int screen_width, int screen_height);
 
void ui_draw_rounded_rect(UIContext* ui_context, float rect_x, float rect_y,
                          float width, float height, float radius,
                          const vec3 color, float alpha, int screen_width,
                          int screen_height);
 
void ui_draw_glow_rect(UIContext* ui_context, float rect_x, float rect_y,
                       float width, float height, float radius,
                       const vec3 color, float alpha, int screen_width,
                       int screen_height);
 
void ui_draw_textured_quad(UIContext* ui_context, GLuint texture, float rect_x,
                           float rect_y, float width, float height,
                           const vec3 tint, float alpha, int screen_width,
                           int screen_height);
 
void ui_draw_bloom_quad(UIContext* ui_context, GLuint texture, float rect_x,
                        float rect_y, float width, float height,
                        const vec3 tint, float intensity, int screen_width,
                        int screen_height);
 
#endif /* UI_H */