app_ui.h

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#ifndef APP_UI_H
#define APP_UI_H
#include "glad/glad.h"
#include "ui.h"
#include <stdbool.h>
 
/* Histogram bucket count (used by tests and postprocess) */
enum { HISTO_BUCKETS = 256 };
 
/* Highlight duration for key-press animation (shared with app_input.c) */
static const float HELP_PRESS_DURATION = 2.0F;
 
typedef enum {
    HELP_MODE_OFF = 0,
    HELP_MODE_KEYBOARD,
    HELP_MODE_GAMEPAD,
    HELP_MODE_COUNT
} HelpMode;
 
typedef struct {
    float key_size;
    float key_padding;
    float key_radius;
    float label_scale;
    float title_y_offset;
    float detail_y_offset;
} KeyboardLayoutConfig;
 
typedef struct AppUIOverlay {
    UIContext ui;
    KeyboardLayoutConfig kbd_config;
 
    HelpMode show_help;
    bool show_info_overlay;
    int text_overlay_mode;
    bool show_exposure_debug;
 
    int help_hovered_key;
    int help_pressed_key;
    int help_pressed_mods;
    double help_press_timer;
    double help_global_dim;
    double help_hover_decay; 
    double help_gp_decay; 
    /* Cyberpunk keyboard overlay textures (PNG assets) */
    GLuint
        kbd_tex_frame; 
    GLuint
        kbd_tex_key_base; 
    bool help_captured_camera;
} AppUIOverlay;
 
typedef struct App App;
 
void app_draw_help_overlay(const App* app);
 
void app_draw_gamepad_help_overlay(const App* app);
 
void app_draw_debug_overlay(const App* app);
 
void app_render_ui(const App* app);
 
/* --- Internal helper functions --- */
 
int compute_luminance_histogram(const App* app, int* buckets, int size,
                                float* min_lum, float* max_lum);
 
void app_ui_init(AppUIOverlay* overlay);
void app_ui_cleanup(AppUIOverlay* overlay);
void app_ui_update(AppUIOverlay* overlay, double delta_time);
void app_ui_handle_mouse(AppUIOverlay* overlay, double xpos, double ypos,
                         int width, int height);
 
#endif /* APP_UI_H */