gui.h

   1 #ifndef GUI_H
   2 #define GUI_H
   3
   4 #include "font.h"
   5
   6 struct{
   7    struct gui_helper{
   8       const char *bindstr, *text;
   9    }
  10    helpers[4];
  11    u32 helper_count;
  12
  13    float factive;
  14 }
  15 static gui;
  16
  17 VG_STATIC
  18 void gui_draw(void)
  19 {
  20    camera ortho;
  21
  22    float fl = 0.0f,
  23          fr = vg.window_x,
  24          fb = 0.0f,
  25          ft = vg.window_y,
  26          rl = 1.0f / (fr-fl),
  27          tb = 1.0f / (ft-fb);
  28
  29    m4x4_zero( ortho.mtx.p );
  30    ortho.mtx.p[0][0] = 2.0f * rl;
  31    ortho.mtx.p[1][1] = 2.0f * tb;
  32    ortho.mtx.p[3][0] = (fr + fl) * -rl;
  33    ortho.mtx.p[3][1] = (ft + fb) * -tb;
  34    ortho.mtx.p[3][3] = 1.0f;
  35    m4x3_identity( ortho.transform );
  36    camera_update_view( &ortho );
  37    camera_finalize( &ortho );
  38
  39    gui.factive = vg_lerpf( gui.factive, gui.helper_count?1.0f:0.0f,
  40                            vg.time_delta*2.0f );
  41
  42    if( gui.factive > 0.01f ){
  43       /* draw bottom bar */
  44       glEnable(GL_BLEND);
  45       glDisable(GL_DEPTH_TEST);
  46       glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
  47       glBlendEquation(GL_FUNC_ADD);
  48
  49       shader_blitcolour_use();
  50       shader_blitcolour_uColour( (v4f){ 0.0f, 0.0f, 0.0f, gui.factive*0.8f } );
  51       render_fsquad1();
  52    }
  53
  54    font3d *font = &world_global.font;
  55    font3d_bind( font, &ortho );
  56
  57    float dy    = ft/0.79f,
  58          scale = dy*0x1p-4f*0.75f;
  59
  60    m4x3f mmdl;
  61    v4f q;
  62    m3x3_identity( mmdl );
  63    m3x3_scale( mmdl, (v3f){scale,scale,scale} );
  64    v3_zero( mmdl[3] );
  65
  66    float pad = dy*0x1p-4f*0.125f;
  67    mmdl[3][0] = pad*2.0f;
  68    mmdl[3][1] = pad;
  69
  70    for( u32 i=0; i<gui.helper_count; i++ ){
  71       struct gui_helper *helper = &gui.helpers[i];
  72
  73       shader_model_font_uColour( (v4f){1.0f,1.0f,1.0f,1.0f} );
  74
  75       struct font3d_render render;
  76       font3d_begin( font, 2, &ortho, mmdl, &render );
  77
  78       render.u8pch = (u8*)helper->bindstr;
  79       font3d_draw( &render );
  80
  81       const char *make_smaller = "\x02\xaf\x03 ";
  82       render.u8pch = (const u8*)make_smaller;
  83       font3d_draw( &render );
  84
  85       render.u8pch = (u8*)helper->text;
  86       font3d_draw( &render );
  87
  88       float w = render.offset[0]+1.0f;
  89       mmdl[3][0] += w*scale;
  90    }
  91
  92    gui.helper_count = 0;
  93 }
  94
  95 VG_STATIC
  96 void gui_helper_action( const char *bindstr, const char *text )
  97 {
  98    if( gui.helper_count >= vg_list_size(gui.helpers) )
  99       vg_fatal_error( "Too many helpers\n" );
 100
 101    struct gui_helper *helper = &gui.helpers[ gui.helper_count ++ ];
 102    helper->bindstr = bindstr;
 103    helper->text = text;
 104 }
 105
 106 #endif /* GUI_H */