vg_ui.h

   1 /* Copyright (C) 2021-2022 Harry Godden (hgn) - All Rights Reserved */
   2
   3 #ifndef VG_UI_H
   4 #define VG_UI_H
   5
   6 #define VG_GAME
   7 #include "vg/vg.h"
   8 #include "vg/vg_tex.h"
   9 #include "vg/vg_shader.h"
  10
  11 static struct vg_shader _shader_ui =
  12 {
  13    .name = "[vg] ui",
  14    .link = NULL,
  15    .vs =
  16    {
  17       .orig_file = NULL,
  18       .static_src =
  19         "layout (location=0) in vec2 a_co;"
  20         "layout (location=1) in vec2 a_uv;"
  21         "layout (location=2) in vec4 a_colour;"
  22         "layout (location=3) in vec4 a_clip;"
  23         "uniform mat3 uPv;"
  24         ""
  25         "out vec2 aTexCoords;"
  26         "out vec4 aColour;"
  27         "out vec2 aWsp;"
  28         "out vec4 aClip;"
  29         ""
  30         "void main()"
  31         "{"
  32                 "gl_Position = vec4( uPv * vec3( a_co, 1.0 ), 1.0 );"
  33                 "aTexCoords = a_uv * 0.0078125;"
  34                 "aColour = a_colour;"
  35
  36                 "aWsp = a_co;"
  37                 "aClip = a_clip;"
  38         "}",
  39    },
  40    .fs =
  41    {
  42       .orig_file = NULL,
  43       .static_src =
  44         "uniform sampler2D uTexGlyphs;"
  45         "out vec4 FragColor;"
  46         ""
  47         "in vec2 aTexCoords;"
  48         "in vec4 aColour;"
  49         ""
  50         "in vec2 aWsp;"
  51         "in vec4 aClip;"
  52         ""
  53         "void main()"
  54         "{"
  55                 "float clip_blend = step( aWsp.x, aClip.z ) *"
  56                          "step( aWsp.y, aClip.w ) *"
  57                          "step( aClip.x, aWsp.x ) *"
  58                          "step( aClip.y, aWsp.y ); "
  59
  60                 "vec4 glyph = vec4(1.0,1.0,1.0,1.0);"
  61
  62                 "if( aColour.a == 0.0 )"
  63                 "{"
  64                         "glyph = texture( uTexGlyphs, aTexCoords );"
  65                         "glyph.a = smoothstep( 0.47, 0.53, glyph.r );"
  66                 "}"
  67                 "else"
  68                 "{"
  69                         "glyph.a = aColour.a;"
  70                 "}"
  71
  72                 "FragColor = vec4( aColour.rgb, glyph.a*clip_blend );"
  73         "}"
  74    }
  75 };
  76
  77 typedef i16                             ui_px;
  78 typedef u32                             ui_colour;
  79 typedef ui_px                           ui_rect[4];
  80 typedef struct ui_colourset ui_colourset;
  81
  82 /* Relative to cursor p0 */
  83 enum ui_text_align
  84 {
  85    k_text_align_left = 0,
  86    k_text_align_right = 1,
  87    k_text_align_center = 2
  88 };
  89
  90 struct ui_colourset
  91 {
  92         union
  93         {
  94                 struct
  95                 {
  96                         ui_colour main;
  97                         ui_colour hover;
  98                         ui_colour active;
  99                 };
 100                 struct
 101                 {
 102                         ui_colour background;
 103                         ui_colour bar;
 104                         ui_colour bar_hover;
 105                 };
 106         };
 107 };
 108
 109 #pragma pack(push,1)
 110 struct ui_vert
 111 {
 112    ui_px co[2];
 113    u8 uv[2];
 114    u32 colour;
 115    ui_rect clip;
 116 };
 117 #pragma pack(pop)
 118
 119 struct
 120 {
 121         struct ui_qnode
 122         {
 123                 ui_rect                 rect;
 124                 ui_colour       colour;
 125                 int                     mouse_over;
 126                 int                     capture_id;
 127         }
 128         stack[ 32 ];
 129
 130    u32 control_id;
 131
 132    struct ui_vert *vertex_buffer;
 133    u16            *indice_buffer;
 134         u32 max_verts, max_indices, cur_vert, cur_indice;
 135
 136         ui_rect clipping;
 137         ui_rect cursor;
 138         u32 stack_count;
 139         u32 capture_mouse_id;
 140         int capture_lock;
 141
 142         /* User input */
 143         ui_px mouse[2];
 144         int click_state;        /* 0: released, 1: on down, 2: pressed, 3: on release */
 145
 146         ui_colourset *colours;
 147
 148         GLuint vao;
 149         GLuint vbo;
 150         GLuint ebo;
 151
 152         struct ui_image
 153         {
 154                 ui_rect rc;
 155                 GLuint image;
 156         }
 157         images[16];
 158         int image_count;
 159 }
 160 static vg_uictx;
 161
 162 #define UI_GLYPH_SPACING_X 8
 163
 164 static GLuint ui_glyph_texture = 0;
 165 static ui_colourset ui_default_colours = {
 166         .main = 0xff807373,
 167         .hover = 0xff918484,
 168         .active = 0xffad9f9e
 169 };
 170
 171 VG_STATIC void _vg_ui_init(void)
 172 {
 173    if( !vg_shader_compile( &_shader_ui ) )
 174       vg_fatal_exit_loop( "Failed to compile ui shader" );
 175
 176    /*
 177     * Vertex buffer
 178     * ----------------------------------------
 179     */
 180
 181    vg_uictx.max_indices = 20000;
 182    vg_uictx.max_verts = 30000;
 183    vg_uictx.colours = &ui_default_colours;
 184
 185         /* Generate the buffer we are gonna be drawing to */
 186    glGenVertexArrays( 1, &vg_uictx.vao );
 187    glGenBuffers( 1, &vg_uictx.vbo );
 188    glGenBuffers( 1, &vg_uictx.ebo );
 189
 190    glBindVertexArray( vg_uictx.vao );
 191    glBindBuffer( GL_ARRAY_BUFFER, vg_uictx.vbo );
 192
 193    glBufferData( GL_ARRAY_BUFFER,
 194          vg_uictx.max_verts * sizeof( struct ui_vert ),
 195          NULL, GL_DYNAMIC_DRAW );
 196    glBindVertexArray( vg_uictx.vao );
 197
 198    glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, vg_uictx.ebo );
 199    glBufferData( GL_ELEMENT_ARRAY_BUFFER,
 200          vg_uictx.max_indices * sizeof( u16 ), NULL, GL_DYNAMIC_DRAW );
 201
 202    VG_CHECK_GL_ERR();
 203
 204    /* Set pointers */
 205    u32 const stride = sizeof( struct ui_vert );
 206
 207    /* XY */
 208    glVertexAttribPointer( 0, 2, GL_SHORT, GL_FALSE,
 209          stride, (void *)offsetof( struct ui_vert, co ) );
 210    glEnableVertexAttribArray( 0 );
 211
 212    /* UV */
 213    glVertexAttribPointer( 1, 2, GL_UNSIGNED_BYTE, GL_FALSE,
 214          stride, (void *)offsetof( struct ui_vert, uv ) );
 215    glEnableVertexAttribArray( 1 );
 216
 217    /* COLOUR */
 218    glVertexAttribPointer( 2, 4, GL_UNSIGNED_BYTE, GL_TRUE, stride,
 219          (void *)offsetof( struct ui_vert, colour ) );
 220    glEnableVertexAttribArray( 2 );
 221
 222    /* CLIPPING */
 223    glVertexAttribPointer( 3, 4, GL_SHORT, GL_FALSE, stride,
 224          (void *)offsetof( struct ui_vert, clip ) );
 225    glEnableVertexAttribArray( 3 );
 226
 227    VG_CHECK_GL_ERR();
 228
 229         /* Alloc RAM default context */
 230    u32 vert_size = vg_uictx.max_verts*sizeof(struct ui_vert),
 231        inds_size = vg_align8( vg_uictx.max_indices*sizeof(u16) );
 232
 233    vg_uictx.vertex_buffer = vg_linear_alloc( vg_mem.rtmemory, vert_size );
 234    vg_uictx.indice_buffer = vg_linear_alloc( vg_mem.rtmemory, inds_size );
 235
 236    /* font
 237     * -----------------------------------------------------
 238     */
 239
 240         /* Load default font */
 241    u32 compressed[] = {
 242       #include "vg/vg_pxfont_thin.h"
 243    };
 244
 245    u32 pixels = 0, total = 256*256, data = 0;
 246    u8 image[256*256];
 247
 248    while( pixels < total )
 249    {
 250       for( int b = 31; b >= 0; b-- )
 251       {
 252          image[ pixels ++ ] = (compressed[data] & (0x1 << b))? 0xff: 0x00;
 253
 254          if( pixels >= total )
 255          {
 256             total = 0;
 257             break;
 258          }
 259       }
 260       data++;
 261    }
 262
 263    glGenTextures( 1, &ui_glyph_texture );
 264    glBindTexture( GL_TEXTURE_2D, ui_glyph_texture );
 265    glTexImage2D( GL_TEXTURE_2D, 0, GL_R8, 256, 256, 0,
 266                  GL_RED, GL_UNSIGNED_BYTE, image );
 267
 268    VG_CHECK_GL_ERR();
 269    vg_tex2d_clamp();
 270    vg_tex2d_nearest();
 271 }
 272
 273 static struct ui_vert *ui_fill_rect_uv( ui_rect rect, u32 colour, ui_px uv[4] );
 274
 275 VG_STATIC void ui_draw( m3x3f view_override )
 276 {
 277         u32 num_indices_normal = vg_uictx.cur_indice;
 278
 279         /* Append images to back of buffer */
 280         for( int i = 0; i < vg_uictx.image_count; i ++ )
 281    {
 282                 ui_fill_rect_uv( vg_uictx.images[i].rc, 0xffffffff,
 283                        (ui_px[4]){0,0,128,128} );
 284    }
 285
 286         glBindVertexArray( vg_uictx.vao );
 287
 288         glBindBuffer( GL_ARRAY_BUFFER, vg_uictx.vbo );
 289         glBufferSubData( GL_ARRAY_BUFFER, 0,
 290          vg_uictx.cur_vert * sizeof( struct ui_vert ),
 291          vg_uictx.vertex_buffer );
 292
 293         glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, vg_uictx.ebo );
 294         glBufferSubData( GL_ELEMENT_ARRAY_BUFFER, 0,
 295          vg_uictx.cur_indice * sizeof( u16 ),
 296          vg_uictx.indice_buffer );
 297
 298         glEnable(GL_BLEND);
 299         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 300         glBlendEquation(GL_FUNC_ADD);
 301
 302    glUseProgram( _shader_ui.id );
 303
 304         m3x3f view = M3X3_IDENTITY;
 305
 306         if( !view_override )
 307         {
 308                 view_override = view;
 309
 310                 m3x3_translate( view, (v3f){ -1.0f, 1.0f, 0.0f } );
 311                 m3x3_scale( view, (v3f){ 1.0f/((float)vg.window_x*0.5f),
 312                               -1.0f/((float)vg.window_y*0.5f), 1.0f } );
 313         }
 314
 315    /* TODO? */
 316         glUniformMatrix3fv( glGetUniformLocation( _shader_ui.id, "uPv" ), 1,
 317          GL_FALSE, (float *)view_override );
 318
 319         glActiveTexture( GL_TEXTURE0 );
 320         glBindTexture( GL_TEXTURE_2D, ui_glyph_texture );
 321         glUniform1i( glGetUniformLocation( _shader_ui.id, "uTexGlyphs" ), 0 );
 322
 323         glDrawElements( GL_TRIANGLES, num_indices_normal,
 324          GL_UNSIGNED_SHORT, (void*)(0) );
 325
 326         /* Draw image elements */
 327         for( int i = 0; i < vg_uictx.image_count; i ++ )
 328         {
 329                 struct ui_image *img = &vg_uictx.images[i];
 330
 331                 glBindTexture( GL_TEXTURE_2D, img->image );
 332                 glDrawElements( GL_TRIANGLES, 6, GL_UNSIGNED_SHORT,
 333             (void*)( (num_indices_normal + 6*i)*sizeof(u16) ) );
 334         }
 335
 336         glDisable(GL_BLEND);
 337 }
 338
 339 /*
 340  * Rect controls
 341  */
 342 VG_STATIC void ui_rect_copy( ui_rect src, ui_rect dst )
 343 {
 344         dst[0] = src[0];
 345         dst[1] = src[1];
 346         dst[2] = src[2];
 347         dst[3] = src[3];
 348 }
 349
 350 VG_STATIC void ui_rect_pad( ui_rect rect, ui_px pad )
 351 {
 352         rect[0] += pad;
 353         rect[1] += pad;
 354         rect[2] -= pad*2;
 355         rect[3] -= pad*2;
 356 }
 357
 358 /*
 359  * Stack control
 360  */
 361 static struct ui_qnode *ui_current(void)
 362 {
 363         return &vg_uictx.stack[ vg_uictx.stack_count-1 ];
 364 }
 365
 366 VG_STATIC void ui_new_node(void)
 367 {
 368         if( vg_uictx.stack_count == vg_list_size( vg_uictx.stack ) )
 369    {
 370       vg_error( "[UI] Stack overflow while creating box!" );
 371       return;
 372    }
 373
 374         struct ui_qnode *parent = &vg_uictx.stack[ vg_uictx.stack_count-1 ];
 375         struct ui_qnode *node = &vg_uictx.stack[ vg_uictx.stack_count++ ];
 376         ui_rect_copy( vg_uictx.cursor, node->rect );
 377
 378         if( parent->mouse_over )
 379         {
 380                 if( vg_uictx.mouse[0] >= node->rect[0] &&
 381           vg_uictx.mouse[0] < node->rect[0]+node->rect[2] &&
 382                          vg_uictx.mouse[1] >= node->rect[1] &&
 383           vg_uictx.mouse[1] < node->rect[1]+node->rect[3] )
 384                         node->mouse_over = 1;
 385                 else
 386                         node->mouse_over = 0;
 387         }
 388         else
 389         {
 390                 node->mouse_over = 0;
 391         }
 392 }
 393
 394 static int ui_hasmouse(void)
 395 {
 396         struct ui_qnode *node = ui_current();
 397         return (node->mouse_over && (node->capture_id == vg_uictx.capture_mouse_id));
 398 }
 399
 400 VG_STATIC void ui_end(void)
 401 {
 402         struct ui_qnode *node = &vg_uictx.stack[ --vg_uictx.stack_count ];
 403         ui_rect_copy( node->rect, vg_uictx.cursor );
 404 }
 405
 406 VG_STATIC void ui_end_down(void)
 407 {
 408         ui_px height = ui_current()->rect[3];
 409         ui_end();
 410         vg_uictx.cursor[1] += height;
 411 }
 412
 413 VG_STATIC void ui_end_right(void)
 414 {
 415         ui_px width = ui_current()->rect[2];
 416         ui_end();
 417         vg_uictx.cursor[0] += width;
 418 }
 419
 420 VG_STATIC void ui_fill_y(void)
 421 {
 422         struct ui_qnode *node = ui_current();
 423         vg_uictx.cursor[3] = node->rect[3] - (vg_uictx.cursor[1]-node->rect[1]);
 424 }
 425
 426 VG_STATIC void ui_fill_x(void)
 427 {
 428         struct ui_qnode *node = ui_current();
 429         vg_uictx.cursor[2] = node->rect[2] - (vg_uictx.cursor[0]-node->rect[0]);
 430 }
 431
 432 VG_STATIC void ui_align_bottom(void)
 433 {
 434         struct ui_qnode *node = ui_current();
 435         vg_uictx.cursor[1] = node->rect[1] + node->rect[3] - vg_uictx.cursor[3];
 436 }
 437
 438 VG_STATIC void ui_align_right(void)
 439 {
 440         struct ui_qnode *node = ui_current();
 441         vg_uictx.cursor[0] = node->rect[0] + node->rect[2] - vg_uictx.cursor[2];
 442 }
 443
 444 VG_STATIC void ui_align_top(void)
 445 {
 446         vg_uictx.cursor[1] = ui_current()->rect[1];
 447 }
 448
 449 VG_STATIC void ui_align_left(void)
 450 {
 451         vg_uictx.cursor[0] = ui_current()->rect[0];
 452 }
 453
 454 VG_STATIC void ui_clamp_rect( ui_rect parent, ui_rect dest )
 455 {
 456         dest[0] = vg_min( parent[0] + parent[2] - dest[2], dest[0] );
 457         dest[1] = vg_min( parent[1] + parent[3] - dest[3], dest[1] );
 458         dest[0] = vg_max( parent[0], dest[0] );
 459         dest[1] = vg_max( parent[1], dest[1] );
 460 }
 461
 462 VG_STATIC void ui_capture_mouse( u32 id )
 463 {
 464         struct ui_qnode *node = &vg_uictx.stack[ vg_uictx.stack_count-1 ];
 465         node->capture_id = id;
 466
 467         if( !vg_uictx.capture_lock && node->mouse_over )
 468         {
 469                 vg_uictx.capture_mouse_id = id;
 470         }
 471 }
 472
 473 static int ui_want_mouse(void)
 474 {
 475         return vg_uictx.capture_mouse_id == 0? 0: 1;
 476 }
 477
 478 VG_STATIC void ui_set_clip( ui_rect clip )
 479 {
 480         vg_uictx.clipping[0] = clip[0];
 481         vg_uictx.clipping[1] = clip[1];
 482         vg_uictx.clipping[2] = clip[0] + clip[2];
 483         vg_uictx.clipping[3] = clip[1] + clip[3];
 484 }
 485
 486 VG_STATIC void ui_release_clip(void)
 487 {
 488         vg_uictx.clipping[0] = -32000;
 489         vg_uictx.clipping[1] = -32000;
 490         vg_uictx.clipping[2] =  32000;
 491         vg_uictx.clipping[3] =  32000;
 492 }
 493
 494 static struct ui_vert *ui_fill_rect_uv( ui_rect rect, u32 colour, ui_px uv[4] )
 495 {
 496    /* this if far from ideal but stops us from crashing */
 497    if( (vg_uictx.cur_vert + 6 > vg_uictx.max_verts) ||
 498        (vg_uictx.cur_indice + 4 > vg_uictx.max_indices))
 499       return vg_uictx.vertex_buffer;
 500
 501    struct ui_vert *vertices = &vg_uictx.vertex_buffer[ vg_uictx.cur_vert ];
 502         u16            *indices  = &vg_uictx.indice_buffer[ vg_uictx.cur_indice ];
 503
 504         vertices[0].co[0] = rect[0];
 505         vertices[0].co[1] = rect[1];
 506         vertices[0].uv[0] = uv[0];
 507         vertices[0].uv[1] = uv[1];
 508         vertices[0].colour = colour;
 509         vertices[1].co[0] = rect[0]+rect[2];
 510         vertices[1].co[1] = rect[1];
 511         vertices[1].uv[0] = uv[2];
 512         vertices[1].uv[1] = uv[1];
 513         vertices[1].colour = colour;
 514         vertices[2].co[0] = rect[0]+rect[2];
 515         vertices[2].co[1] = rect[1]+rect[3];
 516         vertices[2].uv[0] = uv[2];
 517         vertices[2].uv[1] = uv[3];
 518         vertices[2].colour = colour;
 519         vertices[3].co[0] = rect[0];
 520         vertices[3].co[1] = rect[1]+rect[3];
 521         vertices[3].uv[0] = uv[0];
 522         vertices[3].uv[1] = uv[3];
 523         vertices[3].colour = colour;
 524         u16 ind_start = vg_uictx.cur_vert;
 525
 526         ui_rect_copy( vg_uictx.clipping, vertices[0].clip );
 527         ui_rect_copy( vg_uictx.clipping, vertices[1].clip );
 528         ui_rect_copy( vg_uictx.clipping, vertices[2].clip );
 529         ui_rect_copy( vg_uictx.clipping, vertices[3].clip );
 530
 531         indices[0] = ind_start+0;
 532         indices[1] = ind_start+2;
 533         indices[2] = ind_start+1;
 534
 535         indices[3] = ind_start+0;
 536         indices[4] = ind_start+3;
 537         indices[5] = ind_start+2;
 538
 539         vg_uictx.cur_indice += 6;
 540         vg_uictx.cur_vert += 4;
 541
 542         return vertices;
 543 }
 544
 545 static struct ui_vert *ui_fill_rect( ui_rect rect, u32 colour )
 546 {
 547         return ui_fill_rect_uv( rect, colour, (ui_px[4]){ 4,4, 4,4 } );
 548 }
 549
 550 static ui_px ui_text_line_offset( const char *str, ui_px scale,
 551       enum ui_text_align align )
 552 {
 553    if( align == k_text_align_left )
 554       return 0;
 555
 556    int length = 0;
 557    const char *_c = str;
 558    char c;
 559
 560    while( (c = *(_c ++)) )
 561       if( c >= 32 && c <= 126 )
 562          length ++;
 563       else if( c == '\n' )
 564          break;
 565
 566    if( align == k_text_align_right )
 567       return -length * scale*8;
 568    else
 569       return (-length * scale*8) / 2;
 570 }
 571
 572 VG_STATIC void ui_text( ui_px pos[2],
 573       const char *str, ui_px scale, enum ui_text_align align )
 574 {
 575         ui_rect text_cursor;
 576         u32 current_colour = 0x00ffffff;
 577
 578    const char *_c = str;
 579         u8 c;
 580
 581         text_cursor[0] = pos[0] + ui_text_line_offset( str, scale, align );
 582         text_cursor[1] = pos[1];
 583         text_cursor[2] = 8*scale;
 584         text_cursor[3] = 14*scale;
 585
 586         while( (c = *(_c ++)) )
 587         {
 588                 if( c == '\n' )
 589                 {
 590                         text_cursor[1] += 14*scale;
 591                         text_cursor[0] = pos[0] + ui_text_line_offset( _c, scale, align );
 592                         continue;
 593                 }
 594                 else if( c >= 33 )
 595                 {
 596                         u8 glyph_base[2];
 597                         u8 glyph_index = c;
 598                         glyph_base[0] = glyph_index & 0xf;
 599                         glyph_base[1] = (glyph_index-glyph_base[0])>>4;
 600
 601                         glyph_base[0] *= 8;
 602                         glyph_base[1] *= 8;
 603
 604                         ui_fill_rect_uv( text_cursor, current_colour, (ui_px[4])
 605             {
 606                glyph_base[0]+2,
 607                glyph_base[1]+1,
 608                glyph_base[0]+6,
 609                glyph_base[1]+8
 610             });
 611                 }
 612                 else if( c == '\x1B' )
 613                 {
 614                         _c ++;
 615                         u16 colour_id = 0;
 616                         for( int i = 0; i < 3; i ++ )
 617                         {
 618                                 if( _c[i] )
 619                                 {
 620                                         if( _c[i] == 'm' )
 621                                         {
 622                                                 _c = _c + i + 1;
 623
 624                                                 switch( colour_id )
 625                                                 {
 626                                                         case '0': current_colour = 0x00ffffff; break;
 627                                                         case '3'|'1'<<8: current_colour = 0x00201fee; break;
 628                                                         case '3'|'2'<<8: current_colour = 0x0037e420; break;
 629                                                         case '3'|'3'<<8: current_colour = 0x000ed8e2; break;
 630                                                         case '3'|'4'<<8: current_colour = 0x00f15010; break;
 631                                                         case '3'|'5'<<8: current_colour = 0x00ee20ee; break;
 632                                                         case '3'|'6'<<8: current_colour = 0x00eeee20; break;
 633                                                         case '3'|'7'<<8: current_colour = 0x00ffffff; break;
 634                                                 }
 635
 636                                                 break;
 637                                         }
 638
 639                                         colour_id |= _c[i] << (i*8);
 640                                 }
 641                                 else
 642                                 {
 643                                         _c = _c +i;
 644                                         break;
 645                                 }
 646                         }
 647
 648          continue;
 649                 }
 650       else if( c == '\t' )
 651       {
 652          text_cursor[0] += UI_GLYPH_SPACING_X*scale*4;
 653          continue;
 654       }
 655
 656         text_cursor[0] += UI_GLYPH_SPACING_X*scale;
 657         }
 658 }
 659
 660 /*
 661  * API Control
 662  */
 663 VG_STATIC void ui_begin( ui_px res_x, ui_px res_y )
 664 {
 665         vg_uictx.cursor[0] = 0;
 666         vg_uictx.cursor[1] = 0;
 667         vg_uictx.cursor[2] = res_x;
 668         vg_uictx.cursor[3] = res_y;
 669
 670         ui_rect_copy( vg_uictx.cursor, vg_uictx.stack[0].rect );
 671         vg_uictx.stack[0].mouse_over = 1;
 672
 673         vg_uictx.stack_count = 1;
 674
 675         vg_uictx.cur_vert = 0;
 676         vg_uictx.cur_indice = 0;
 677
 678         ui_release_clip();
 679
 680         if( vg_uictx.click_state == 0 )
 681                 vg_uictx.capture_mouse_id = 0;
 682
 683         vg_uictx.image_count = 0;
 684 }
 685
 686 VG_STATIC void ui_resolve(void)
 687 {
 688         if( vg_uictx.stack_count-1 )
 689    {
 690       vg_error( "[UI] Mismatched node create/drestroy!" );
 691       return;
 692    }
 693
 694         if( vg_uictx.click_state == 3 || vg_uictx.click_state == 0 )
 695         {
 696                 vg_uictx.capture_lock = 0;
 697         }
 698 }
 699
 700 VG_STATIC void ui_set_mouse( int x, int y, int click_state )
 701 {
 702         vg_uictx.mouse[0] = x;
 703         vg_uictx.mouse[1] = y;
 704
 705         vg_uictx.click_state = click_state;
 706 }
 707
 708 /*
 709  * High level controls
 710  */
 711 struct ui_window
 712 {
 713         const char *title;
 714         ui_rect transform;
 715
 716         int     drag;
 717         ui_px drag_offset[2];
 718 };
 719
 720 enum button_state
 721 {
 722         k_button_released = 0,
 723         k_button_start_click,
 724         k_button_click,
 725         k_button_hold
 726 };
 727
 728 static int ui_button(void)
 729 {
 730    u32 uid = vg_uictx.control_id ++;
 731
 732         ui_new_node();
 733         {
 734                 ui_capture_mouse( uid );
 735
 736                 if( ui_hasmouse() )
 737                 {
 738                         ui_fill_rect( vg_uictx.cursor, vg_uictx.colours->hover );
 739
 740                         if( vg_uictx.click_state == 1 )
 741                         {
 742                                 vg_uictx.capture_lock = 1;
 743                                 return k_button_start_click;
 744                         }
 745                         else if( vg_uictx.capture_lock && vg_uictx.click_state == 3 )
 746                                 return k_button_click;
 747                         else if( vg_uictx.capture_lock && vg_uictx.click_state == 2 )
 748                                 return k_button_hold;
 749
 750          return k_button_click;
 751                 }
 752                 else
 753                         ui_fill_rect( vg_uictx.cursor, vg_uictx.colours->main );
 754         }
 755
 756         return k_button_released;
 757 }
 758
 759 static int ui_window( struct ui_window *window, u32 control_group )
 760 {
 761         if( window->drag )
 762         {
 763                 window->transform[0] = vg_uictx.mouse[0]+window->drag_offset[0];
 764                 window->transform[1] = vg_uictx.mouse[1]+window->drag_offset[1];
 765
 766                 ui_clamp_rect( vg_uictx.stack[0].rect, window->transform );
 767
 768                 if( vg_uictx.click_state == 0 || vg_uictx.click_state == 3 )
 769                 {
 770                         window->drag = 0;
 771                 }
 772         }
 773
 774         ui_rect_copy( window->transform, vg_uictx.cursor );
 775
 776         ui_new_node();
 777         {
 778                 ui_capture_mouse( vg_uictx.control_id ++ );
 779
 780                 /* Drag bar */
 781                 vg_uictx.cursor[3] = 25;
 782                 ui_new_node();
 783                 {
 784                         ui_capture_mouse( vg_uictx.control_id ++ );
 785
 786                         struct ui_vert *drag_bar = ui_fill_rect( vg_uictx.cursor, 0xff555555 );
 787
 788                         /* title.. */
 789                         vg_uictx.cursor[0] += 2;
 790                         vg_uictx.cursor[1] += 2;
 791                         ui_text( vg_uictx.cursor, window->title, 2, 0 );
 792
 793                         /* Close button */
 794                         vg_uictx.cursor[3] = 25;
 795                         vg_uictx.cursor[2] = 25;
 796                         ui_align_right();
 797                         ui_align_top();
 798                         ui_rect_pad( vg_uictx.cursor, 4 );
 799
 800                         if( ui_button() )
 801                         {
 802                                 vg_info( "Click clacked\n" );
 803                         }
 804                         vg_uictx.cursor[0] += 2;
 805                         ui_text( vg_uictx.cursor, "x", 2, 0 );
 806                         ui_end();
 807
 808                         if( ui_hasmouse() )
 809                         {
 810                                 drag_bar[0].colour = 0xff777777;
 811                                 drag_bar[1].colour = 0xff777777;
 812                                 drag_bar[2].colour = 0xff777777;
 813                                 drag_bar[3].colour = 0xff777777;
 814
 815                                 /* start drag */
 816                                 if( vg_uictx.click_state == 1 )
 817                                 {
 818                                         window->drag = 1;
 819                                         window->drag_offset[0] = window->transform[0]-vg_uictx.mouse[0];
 820                                         window->drag_offset[1] = window->transform[1]-vg_uictx.mouse[1];
 821                                 }
 822                         }
 823                 }
 824                 ui_end_down();
 825         }
 826
 827         return 1;
 828 }
 829
 830 VG_STATIC void ui_push_image( ui_rect rc, GLuint image )
 831 {
 832         struct ui_image *img = &vg_uictx.images[ vg_uictx.image_count ++ ];
 833         ui_rect_copy( rc, img->rc );
 834         img->image = image;
 835 }
 836
 837 struct ui_slider
 838 {
 839    float *data;
 840    float min, max;
 841 };
 842
 843 struct ui_slider_vector
 844 {
 845    float *data, min, max;
 846    struct ui_slider sub[4];
 847    u32 len;
 848 };
 849
 850 struct ui_checkbox
 851 {
 852    int *data;
 853 };
 854
 855 VG_STATIC void ui_slider( struct ui_slider *slider )
 856 {
 857    ui_new_node();
 858
 859    ui_px slider_start = vg_uictx.cursor[0];
 860
 861    float const ftotal = vg_uictx.cursor[2],
 862                fwidth = ftotal*0.25f,
 863                fmove  = ftotal - fwidth,
 864                fstart = fwidth*0.5f,
 865                frange = slider->max-slider->min,
 866                fpos   = (*slider->data - slider->min) / frange;
 867
 868    ui_fill_rect( vg_uictx.cursor, 0xff111111 );
 869    vg_uictx.cursor[2] = fwidth;
 870    vg_uictx.cursor[0] = slider_start + fpos * fmove;
 871
 872    u32 uid = vg_uictx.control_id ++;
 873    int status = ui_button();
 874    if( vg_uictx.capture_lock && (vg_uictx.capture_mouse_id == uid))
 875    {
 876       float ui_new = vg_uictx.mouse[0],
 877             local  = ui_new - (slider_start + fstart),
 878             zo     = vg_clampf(local / fmove,0.0f,1.0f);
 879
 880       *slider->data = vg_lerpf( slider->min, slider->max, zo );
 881    }
 882
 883    vg_uictx.cursor[0] += 4;
 884    vg_uictx.cursor[1] += 4;
 885
 886    char buf[12];
 887    snprintf( buf, 12, "%.2f", *slider->data );
 888    ui_text( vg_uictx.cursor, buf, 1, 0 );
 889    ui_end_down();
 890    ui_end_down();
 891 }
 892
 893 VG_STATIC void ui_slider_vector( struct ui_slider_vector *slider )
 894 {
 895    for( int i=0; i<slider->len; i++ )
 896    {
 897       slider->sub[i].data = &slider->data[i];
 898       slider->sub[i].min = slider->min;
 899       slider->sub[i].max = slider->max;
 900       ui_slider( &slider->sub[i] );
 901    }
 902 }
 903
 904 VG_STATIC void ui_checkbox( struct ui_checkbox *cb )
 905 {
 906    if( ui_button() == k_button_click )
 907       *cb->data ^= 0x1;
 908
 909    ui_new_node();
 910    ui_rect_pad( vg_uictx.cursor, 4 );
 911    if( *cb->data )
 912       ui_fill_rect( vg_uictx.cursor, 0xff00e052 );
 913    else
 914       ui_fill_rect( vg_uictx.cursor, 0xff0052e0 );
 915
 916    ui_end();
 917    ui_end_down();
 918 }
 919
 920 #endif /* VG_UI_H */