fixed more animation bugs, added rudimentary UI

[faros-demo] / src / ui.cc

diff --git a/src/ui.cc b/src/ui.cc
new file mode 100644 (file)
index 0000000..6c77970
--- /dev/null
+++ b/src/ui.cc
@@ -0,0 +1,109 @@
+#include <stdio.h>
+#include <stdarg.h>
+#include <alloca.h>
+#include <GL/glut.h>
+#include "ui.h"
+
+extern int win_width, win_height;
+
+extern bool anim_stopped;
+extern long anim_time;
+
+
+bool init_ui()
+{
+       return true;
+}
+
+void destroy_ui()
+{
+}
+
+void ui()
+{
+       glPushAttrib(GL_ENABLE_BIT);
+       glDisable(GL_DEPTH_TEST);
+
+       glMatrixMode(GL_MODELVIEW);
+       glPushMatrix();
+       glLoadIdentity();
+       glMatrixMode(GL_PROJECTION);
+       glPushMatrix();
+       glLoadIdentity();
+       glOrtho(0, win_width, win_height, 0, -1, 1);
+
+       glEnable(GL_BLEND);
+       glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+       if(anim_stopped) {
+               glBegin(GL_QUADS);
+               glColor3f(1, 1, 1);
+               glVertex2f(10, 10);
+               glVertex2f(10, 50);
+               glVertex2f(22, 50);
+               glVertex2f(22, 10);
+               glVertex2f(30, 10);
+               glVertex2f(30, 50);
+               glVertex2f(42, 50);
+               glVertex2f(42, 10);
+               glEnd();
+       }
+
+       glColor3f(1, 0.9, 0.5);
+       gl_printf(win_width - 100, 20, "%4ld.%03ld", anim_time / 1000, anim_time % 1000);
+
+       glPopMatrix();
+       glMatrixMode(GL_MODELVIEW);
+       glPopMatrix();
+
+       glPopAttrib();
+}
+
+void gl_printf(int x, int y, const char *fmt, ...)
+{
+       va_list ap;
+       int buf_size, curx, cury;
+       char *buf, tmp;
+
+       va_start(ap, fmt);
+       buf_size = vsnprintf(&tmp, 0, fmt, ap);
+       va_end(ap);
+
+       if(buf_size == -1) {
+               buf_size = 512;
+       }
+
+       buf = (char*)alloca(buf_size + 1);
+       va_start(ap, fmt);
+       vsnprintf(buf, buf_size + 1, fmt, ap);
+       va_end(ap);
+
+       static const float tabstop = 4;
+       static const float line_spacing = 18;
+
+       curx = x;
+       cury = y;
+       glRasterPos2i(x, y);
+
+       while(*buf) {
+               char c = *buf++;
+
+               switch(c) {
+               case '\r':
+                       if(*buf == '\n') ++buf;
+               case '\n':
+                       cury += line_spacing;
+                       curx = x;
+                       glRasterPos2i(curx, cury);
+                       break;
+
+               case '\t':
+                       curx = (curx / tabstop) * tabstop + tabstop;
+                       glRasterPos2i(curx, cury);
+                       break;
+
+               default:
+                       glutBitmapCharacter(GLUT_BITMAP_9_BY_15, c);
+               }
+       }
+}