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