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    float factive;
  15 }
  16 static gui;
  17
  18 VG_STATIC
  19 void gui_draw(void)
  20 {
  21    camera ortho;
  22
  23    float fl = 0.0f,
  24          fr = vg.window_x,
  25          fb = 0.0f,
  26          ft = vg.window_y,
  27          rl = 1.0f / (fr-fl),
  28          tb = 1.0f / (ft-fb);
  29
  30    m4x4_zero( ortho.mtx.p );
  31    ortho.mtx.p[0][0] = 2.0f * rl;
  32    ortho.mtx.p[1][1] = 2.0f * tb;
  33    ortho.mtx.p[3][0] = (fr + fl) * -rl;
  34    ortho.mtx.p[3][1] = (ft + fb) * -tb;
  35    ortho.mtx.p[3][3] = 1.0f;
  36    m4x3_identity( ortho.transform );
  37    camera_update_view( &ortho );
  38    camera_finalize( &ortho );
  39
  40    gui.factive = vg_lerpf( gui.factive, gui.helper_count?1.0f:0.0f,
  41                            vg.time_delta*2.0f );
  42
  43    if( gui.factive > 0.01f ){
  44       /* draw bottom bar */
  45       glEnable(GL_BLEND);
  46       glDisable(GL_DEPTH_TEST);
  47       glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
  48       glBlendEquation(GL_FUNC_ADD);
  49
  50       shader_blitcolour_use();
  51       shader_blitcolour_uColour( (v4f){ 0.0f, 0.0f, 0.0f, gui.factive*0.8f } );
  52       render_fsquad1();
  53    }
  54
  55    font3d *font = &world_global.font;
  56    font3d_bind( font, &ortho );
  57
  58    float dy    = ft/0.79f,
  59          scale = dy*0x1p-4f*0.75f;
  60
  61    m4x3f mmdl;
  62    v4f q;
  63    m3x3_identity( mmdl );
  64    m3x3_scale( mmdl, (v3f){scale,scale,scale} );
  65    v3_zero( mmdl[3] );
  66
  67    float pad = dy*0x1p-4f*0.125f;
  68    mmdl[3][0] = pad*2.0f;
  69    mmdl[3][1] = pad;
  70
  71    for( u32 i=0; i<gui.helper_count; i++ ){
  72       struct gui_helper *helper = &gui.helpers[i];
  73
  74       shader_model_font_uColour( (v4f){1.0f,1.0f,1.0f,1.0f} );
  75
  76       float w = font3d_simple_draw( font, 2, helper->text, &ortho, mmdl )+1.0f;
  77       mmdl[3][0] += w*scale;
  78    }
  79
  80    gui.helper_count = 0;
  81 }
  82
  83 VG_STATIC
  84 void gui_helper_action( void *bind, const char *text )
  85 {
  86    if( gui.helper_count >= vg_list_size(gui.helpers) )
  87       vg_fatal_error( "Too many helpers\n" );
  88
  89    struct gui_helper *helper = &gui.helpers[ gui.helper_count ++ ];
  90    helper->bind = bind;
  91    helper->text = text;
  92 }
  93
  94 #endif /* GUI_H */