git.mutantstargoat.com Git - faros-demo/blob - src/ui.cc

   1 #include <stdio.h>
   2 #include <stdarg.h>
   3 #include <alloca.h>
   4 #include <GL/glut.h>
   5 #include "ui.h"
   6
   7 extern int win_width, win_height;
   8
   9 extern bool anim_stopped;
  10 extern long anim_time;
  11
  12
  13 bool init_ui()
  14 {
  15         return true;
  16 }
  17
  18 void destroy_ui()
  19 {
  20 }
  21
  22 void ui()
  23 {
  24         glPushAttrib(GL_ENABLE_BIT);
  25         glDisable(GL_DEPTH_TEST);
  26
  27         glMatrixMode(GL_MODELVIEW);
  28         glPushMatrix();
  29         glLoadIdentity();
  30         glMatrixMode(GL_PROJECTION);
  31         glPushMatrix();
  32         glLoadIdentity();
  33         glOrtho(0, win_width, win_height, 0, -1, 1);
  34
  35         glEnable(GL_BLEND);
  36         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  37
  38         if(anim_stopped) {
  39                 glBegin(GL_QUADS);
  40                 glColor3f(1, 1, 1);
  41                 glVertex2f(10, 10);
  42                 glVertex2f(10, 50);
  43                 glVertex2f(22, 50);
  44                 glVertex2f(22, 10);
  45                 glVertex2f(30, 10);
  46                 glVertex2f(30, 50);
  47                 glVertex2f(42, 50);
  48                 glVertex2f(42, 10);
  49                 glEnd();
  50         }
  51
  52         glColor3f(1, 0.9, 0.5);
  53         gl_printf(win_width - 100, 20, "%4ld.%03ld", anim_time / 1000, anim_time % 1000);
  54
  55         glPopMatrix();
  56         glMatrixMode(GL_MODELVIEW);
  57         glPopMatrix();
  58
  59         glPopAttrib();
  60 }
  61
  62 void gl_printf(int x, int y, const char *fmt, ...)
  63 {
  64         va_list ap;
  65         int buf_size, curx, cury;
  66         char *buf, tmp;
  67
  68         va_start(ap, fmt);
  69         buf_size = vsnprintf(&tmp, 0, fmt, ap);
  70         va_end(ap);
  71
  72         if(buf_size == -1) {
  73                 buf_size = 512;
  74         }
  75
  76         buf = (char*)alloca(buf_size + 1);
  77         va_start(ap, fmt);
  78         vsnprintf(buf, buf_size + 1, fmt, ap);
  79         va_end(ap);
  80
  81         static const float tabstop = 4;
  82         static const float line_spacing = 18;
  83
  84         curx = x;
  85         cury = y;
  86         glRasterPos2i(x, y);
  87
  88         while(*buf) {
  89                 char c = *buf++;
  90
  91                 switch(c) {
  92                 case '\r':
  93                         if(*buf == '\n') ++buf;
  94                 case '\n':
  95                         cury += line_spacing;
  96                         curx = x;
  97                         glRasterPos2i(curx, cury);
  98                         break;
  99
 100                 case '\t':
 101                         curx = (curx / tabstop) * tabstop + tabstop;
 102                         glRasterPos2i(curx, cury);
 103                         break;
 104
 105                 default:
 106                         glutBitmapCharacter(GLUT_BITMAP_9_BY_15, c);
 107                 }
 108         }
 109 }