gui.h

   1 #ifndef GUI_H
   2 #define GUI_H
   3
   4 #include "font.h"
   5
   6 struct{
   7    struct gui_helper{
   8       struct input_binding *bind;
   9       const char *text;
  10    }
  11    helpers[4];
  12    u32 helper_count;
  13 }
  14 static gui;
  15
  16 VG_STATIC
  17 void gui_draw(void)
  18 {
  19    camera ortho;
  20
  21    float fl = 0.0f,
  22          fr = vg.window_x,
  23          fb = 0.0f,
  24          ft = vg.window_y,
  25          rl = 1.0f / (fr-fl),
  26          tb = 1.0f / (ft-fb);
  27
  28    m4x4_zero( ortho.mtx.p );
  29    ortho.mtx.p[0][0] = 2.0f * rl;
  30    ortho.mtx.p[1][1] = 2.0f * tb;
  31    ortho.mtx.p[3][0] = (fr + fl) * -rl;
  32    ortho.mtx.p[3][1] = (ft + fb) * -tb;
  33    ortho.mtx.p[3][3] = 1.0f;
  34    m4x3_identity( ortho.transform );
  35    camera_update_view( &ortho );
  36    camera_finalize( &ortho );
  37
  38    if( gui.helper_count ){
  39       /* draw bottom bar */
  40       glEnable(GL_BLEND);
  41       glDisable(GL_DEPTH_TEST);
  42       glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
  43       glBlendEquation(GL_FUNC_ADD);
  44
  45       shader_blitcolour_use();
  46       shader_blitcolour_uColour( (v4f){ 0.0f, 0.0f, 0.0f, 0.8f } );
  47       render_fsquad1();
  48    }
  49    glDisable(GL_BLEND);
  50
  51    font3d *font = &world_global.font;
  52    font3d_bind( font, &ortho );
  53
  54    float dy    = ft/0.79f,
  55          scale = dy*0x1p-4f*0.75f;
  56
  57    m4x3f mmdl;
  58    v4f q;
  59    m3x3_identity( mmdl );
  60    m3x3_scale( mmdl, (v3f){scale,scale,scale} );
  61    v3_zero( mmdl[3] );
  62
  63    float pad = dy*0x1p-4f*0.125f;
  64    mmdl[3][0] = pad;
  65    mmdl[3][1] = pad;
  66
  67    for( u32 i=0; i<gui.helper_count; i++ ){
  68       struct gui_helper *helper = &gui.helpers[i];
  69
  70       shader_model_font_uColour( (v4f){1.0f,1.0f,1.0f,1.0f} );
  71
  72       float w = font3d_simple_draw( font, 1, helper->text, &ortho, mmdl )+0.2f;
  73       mmdl[3][0] += w*scale;
  74    }
  75
  76    gui.helper_count = 0;
  77 }
  78
  79 VG_STATIC
  80 void gui_helper_action( struct input_binding *bind, const char *text )
  81 {
  82    if( gui.helper_count >= vg_list_size(gui.helpers) )
  83       vg_fatal_error( "Too many helpers\n" );
  84
  85    struct gui_helper *helper = &gui.helpers[ gui.helper_count ++ ];
  86    helper->bind = bind;
  87    helper->text = text;
  88 }
  89
  90 #endif /* GUI_H */