vg_imgui.h

   1 /* Copyright (C) 2021-2024 Harry Godden (hgn) - All Rights Reserved */
   2
   3 /*
   4  *  Principles:
   5  *
   6  *    1. layout is defined by subdividing
   7  *    2. a parent node should never be resized by the content after creation
   8  *    3. when the ui is in an interactive state, no controls should ever move
   9  *    4. controls directly reference a memory location and use that as their
  10  *       unique id
  11  *    5. a maximum of ONE control per memory location can be drawn at any given
  12  *       point.
  13  */
  14
  15 #pragma once
  16
  17 #include "vg_engine.h"
  18 #include "vg_tex.h"
  19 #include "vg_shader.h"
  20
  21 typedef i16                             ui_px;
  22 typedef ui_px                           ui_rect[4];
  23 typedef ui_px           ui_point[2];
  24 typedef struct ui_vert  ui_vert;
  25
  26 enum ui_axis {
  27    k_ui_axis_h = 0x0u,
  28    k_ui_axis_v = 0x1u,
  29 };
  30
  31 /* Relative to cursor p0 */
  32 enum ui_align
  33 {  /*                         DC      BA */
  34    k_ui_align_lwr           =         0xff,
  35    k_ui_align_left          = 0x0000| 0x00,
  36    k_ui_align_right         = 0x0000| 0x01,
  37    k_ui_align_center        = 0x0000| 0x02,
  38
  39    k_ui_align_middle        = 0x0100,
  40    k_ui_align_middle_left   = 0x0100| 0x00,
  41    k_ui_align_middle_right  = 0x0100| 0x01,
  42    k_ui_align_middle_center = 0x0100| 0x02,
  43
  44    k_ui_align_bottom        = 0x0200,
  45    k_ui_align_bottom_left   = 0x0200| 0x00,
  46    k_ui_align_bottom_right  = 0x0200| 0x01,
  47    k_ui_align_bottom_center = 0x0200| 0x02,
  48 };
  49
  50 #pragma pack(push,1)
  51 struct ui_vert
  52 {
  53    ui_px co[2];
  54    u16 uv[2];
  55    u32 colour;
  56 };
  57 #pragma pack(pop)
  58
  59 enum ui_scheme_colour{
  60    k_ui_bg      = 0,
  61    k_ui_fg      = 8,
  62    k_ui_hue     = 16,
  63    k_ui_red     = 16,
  64    k_ui_orange,
  65    k_ui_yellow,
  66    k_ui_green,
  67    k_ui_aqua,
  68    k_ui_blue,
  69    k_ui_purple,
  70    k_ui_gray,
  71    k_ui_brighter = 8
  72 };
  73
  74 enum ui_shader {
  75    k_ui_shader_colour,
  76    k_ui_shader_image,
  77    k_ui_shader_hsv,
  78 };
  79
  80 extern ui_px k_ui_widget_height,
  81              k_ui_scale,
  82              k_ui_padding;
  83
  84 typedef u32 ui_scheme[8*4];
  85
  86 struct ui_font {
  87    ui_px glyph_width,
  88          glyph_height,
  89          glyph_baseline,
  90          line_height,
  91          sheet_size,
  92          spacing,
  93          offset_y;
  94
  95    u8 ascii_start;
  96 };
  97 typedef struct ui_font ui_font;
  98
  99 extern ui_font vg_ui_font_small, vg_ui_font_big;
 100
 101 #define UI_RGB( STDHEX )          0xff000000       |\
 102                          ((STDHEX&0x000000ff)<<16) |\
 103                          ((STDHEX&0x0000ff00)    ) |\
 104                          ((STDHEX&0x00ff0000)>>16)
 105
 106 #define UI_TEXTBOX_MULTILINE 0x1
 107 #define UI_TEXTBOX_WRAP      0x2
 108 #define UI_TEXTBOX_AUTOFOCUS 0x4
 109
 110 #define UI_MODAL_OK        0x0
 111 #define UI_MODAL_GOOD      0x1
 112 #define UI_MODAL_BAD       0x2
 113 #define UI_MODAL_WARN      0x3
 114 #define UI_MODAL_TYPE_BITS 0x3
 115
 116 #define UI_MOUSE_LEFT   (SDL_BUTTON(SDL_BUTTON_LEFT))
 117 #define UI_MOUSE_RIGHT  (SDL_BUTTON(SDL_BUTTON_RIGHT))
 118 #define UI_MOUSE_MIDDLE (SDL_BUTTON(SDL_BUTTON_MIDDLE))
 119
 120 #define UI_TOP 0x1
 121 #define UI_LEFT 0x2
 122 #define UI_BOTTOM 0x4
 123 #define UI_RIGHT 0x8
 124
 125 struct vg_imgui
 126 {
 127    struct ui_vert *vertex_buffer;
 128    u16            *indice_buffer;
 129         u32 max_verts, max_indices,
 130        cur_vert,  cur_indice,
 131        vert_start, indice_start;
 132
 133    union {
 134    void *focused_control_id; /* uses the memory location of various locking
 135                                 controls as an id */
 136    char *textbuf;
 137    i32 *ptr_enum;
 138    };
 139
 140    u32 focused_control_hit;
 141    enum ui_control_type{
 142       k_ui_control_none,
 143       k_ui_control_textbox,
 144       k_ui_control_enum,
 145                 k_ui_control_modal
 146    }
 147    focused_control_type;
 148
 149    union{ /* controls that can be focused */
 150       struct ui_textbuf{
 151          int cursor_user, cursor_pos;
 152          u32 len;
 153          u32 flags;
 154
 155          struct ui_textbox_callbacks{
 156             void (*enter)( char *, u32 ),
 157                  (*up)( char *, u32 ),
 158                  (*down)( char *, u32 ),
 159                  (*change)( char *, u32 ),
 160                  (*escape)( void );
 161          }
 162          callbacks;
 163       }
 164       textbox;
 165
 166       struct ui_enum{
 167          struct ui_enum_opt{
 168             i32 value;
 169             const char *alias;
 170          }
 171          *options;
 172          u32 option_count;
 173          ui_rect rect;
 174       }
 175       _enum;
 176    };
 177
 178         struct ui_modal{
 179                 const char *message;
 180                 u32 options;
 181
 182                 struct ui_modal_callbacks{
 183                         void (*close)(u32);
 184                 }
 185                 callbacks;
 186         }
 187    modal;
 188
 189         GLuint tex_glyphs, vao, vbo, ebo, tex_bg;
 190    v2f bg_inverse_ratio;
 191
 192         ui_px mouse[2], mouse_delta[2], mouse_click[2];
 193    u32 mouse_state[2];
 194    u32 ignore_input_frames;
 195    bool mouse_pos_overriden;
 196    int wants_mouse;
 197
 198    ui_rect click_fader, click_fader_end;
 199    float click_fade_opacity;
 200    f32 frosting;
 201
 202    ui_scheme scheme;
 203    const ui_font *font;
 204
 205    enum ui_cursor{
 206       k_ui_cursor_default,
 207       k_ui_cursor_ibeam,
 208       k_ui_cursor_hand,
 209       k_ui_cursor_max
 210    }
 211    cursor;
 212
 213    SDL_Cursor *cursor_map[ k_ui_cursor_max ];
 214    v4f colour;
 215
 216    f32 hue; /* lol this sucks */
 217 }
 218 extern vg_ui;
 219
 220 enum ui_button_state {
 221    k_ui_button_none            = 0x0,
 222    k_ui_button_click           = 0x1,
 223    k_ui_button_holding_inside  = 0x2,
 224    k_ui_button_holding_outside = 0x4,
 225    k_ui_button_hover           = 0x8
 226 };
 227
 228 /* TODO: docu.. */
 229
 230 void vg_ui_init(void);
 231 void rect_copy( ui_rect a, ui_rect b );
 232 void ui_flush( enum ui_shader shader, f32 w, f32 h );
 233 void ui_fill_rect( ui_rect rect, u32 colour, ui_px uv[4] );
 234 void ui_fill( ui_rect rect, u32 colour );
 235 void ui_outline( ui_rect rect, ui_px thickness, u32 colour, u32 mask );
 236 void ui_split( ui_rect rect, enum ui_axis other, ui_px width, ui_px gap,
 237                ui_rect l, ui_rect r );
 238 void ui_rect_center( ui_rect parent, ui_rect rect );
 239 void ui_fit_item( ui_rect rect, ui_px size[2], ui_rect d );
 240 void ui_split_ratio( ui_rect rect, enum ui_axis dir, float ratio,
 241                      ui_px gap, ui_rect l, ui_rect r );
 242 void ui_rect_pad( ui_rect rect, ui_px pad[2] );
 243 ui_px ui_text_line_width( const char *str );
 244 ui_px ui_text_string_height( const char *str );
 245 ui_px ui_text_aligned_x( const char *str, ui_rect rect, ui_px scale,
 246                          enum ui_align align );
 247 int ui_clip( ui_rect parent, ui_rect child, ui_rect clipped );
 248 int ui_inside_rect( ui_rect rect, ui_px co[2] );
 249 int ui_click_down( u32 mask );
 250 int ui_clicking( u32 mask );
 251 int ui_click_up( u32 mask );
 252 void ui_set_mouse_pos( ui_px x, ui_px y );
 253 void ui_prerender(void);
 254 u32 ui_colour( enum ui_scheme_colour id );
 255
 256 /* get an appropriately contrasting colour given the base */
 257 u32 ui_colourcont( enum ui_scheme_colour id );
 258
 259 void ui_hex_to_norm( u32 hex, v4f norm );
 260 u32 v4f_u32_colour( v4f colour );
 261
 262 u32 ui_opacity( u32 colour, f32 opacity );
 263 u32 ui_ntext( ui_rect rect, const char *str, u32 len, ui_px scale,
 264               enum ui_align align, u32 colour );
 265 void ui_text( ui_rect rect, const char *str, ui_px scale,
 266               enum ui_align align, u32 colour );
 267 void ui_panel( ui_rect in_rect, ui_rect out_panel );
 268 void ui_label( ui_rect rect, const char *text, ui_px size,
 269                ui_px gap, ui_rect r );
 270 void ui_standard_widget( ui_rect inout_panel, ui_rect out_rect, ui_px count );
 271 void ui_info( ui_rect inout_panel, const char *text );
 272 void ui_image( ui_rect rect, GLuint image );
 273 void ui_defocus_all(void);
 274 enum ui_button_state ui_colourbutton( ui_rect rect,
 275                                       enum ui_scheme_colour colour,
 276                                       enum ui_scheme_colour hover_colour,
 277                                       enum ui_scheme_colour hi_colour,
 278                                       bool const fill );
 279 enum ui_button_state ui_colourbutton_text(
 280       ui_rect rect, const char *string, ui_px scale,
 281       enum ui_scheme_colour colour );
 282 enum ui_button_state ui_button_text( ui_rect rect,
 283                                      const char *string, ui_px scale );
 284 enum ui_button_state ui_button( ui_rect inout_panel, const char *string );
 285 void ui_postrender(void);
 286
 287 int ui_checkbox( ui_rect inout_panel, const char *str_label, i32 *data );
 288 void ui_enum( ui_rect inout_panel, const char *str_label,
 289               struct ui_enum_opt *options, u32 len, i32 *value );
 290 bool ui_slider( ui_rect inout_panel, const char *str_label,
 291                 f32 min, f32 max, f32 *value, const char *format );
 292 void ui_colourpicker( ui_rect inout_panel, const char *str_label, v4f value );
 293 int ui_textbox( ui_rect inout_panel, const char *label,
 294                 char *buf, u32 len, u32 lines, u32 flags,
 295                 struct ui_textbox_callbacks *callbacks );
 296 void ui_tabs( ui_rect inout_panel, ui_rect out_content_panel,
 297               const char **titles, u32 count, i32 *page );
 298 void ui_start_modal( const char *message, u32 options );
 299 void ui_proc_key( SDL_Keysym ev );
 300 void ui_proc_utf8( const char *text );
 301 void ui_dev_colourview(void);
 302
 303 void _ui_textbox_move_cursor( int *cursor0, int *cursor1,
 304                               int dir, int snap_together );
 305 int _ui_textbox_delete_char( int direction );
 306 void _ui_textbox_put_char( char c );
 307 void _ui_textbox_up(void);
 308 void _ui_textbox_left(void);
 309 void _ui_textbox_left_select(void);
 310 void _ui_textbox_down(void);
 311 void _ui_textbox_right_select(void);
 312 void _ui_textbox_right(void);
 313 void _ui_textbox_backspace(void);
 314 void _ui_textbox_delete(void);
 315 void _ui_textbox_home_select(void);
 316 void _ui_textbox_home(void);
 317 void _ui_textbox_end_select(void);
 318 void _ui_textbox_end(void);
 319 void _ui_textbox_select_all(void);
 320 void _ui_textbox_cut(void);
 321 void _ui_textbox_enter(void);