Pileus Git - grits/blob - examples/sorting/tes.c

   1 /*
   2  * Copyright (C) 2009-2010 Andy Spencer <andy753421@gmail.com>
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <gtk/gtk.h>
  19 #include <gtk/gtkgl.h>
  20 #include <gdk/gdkkeysyms.h>
  21 #include <GL/gl.h>
  22 #include <GL/glu.h>
  23 #include <stdlib.h>
  24
  25 static gboolean on_expose(GtkWidget *drawing, GdkEventExpose *event, gpointer _)
  26 {
  27         //glClearColor(0.5, 0.5, 1.0, 1.0);
  28         glClearColor(0.0, 0.0, 0.0, 0.0);
  29         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  30
  31         /* No sorting, just add */
  32         glEnable(GL_BLEND);
  33         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  34         //glBlendFunc(GL_ONE, GL_ONE);
  35
  36         /* Lighting */
  37         glMatrixMode(GL_MODELVIEW);
  38         glLoadIdentity();
  39         float light_ambient[]  = {0.3f, 0.3f, 0.1f, 1.0f};
  40         float light_diffuse[]  = {0.9f, 0.9f, 0.9f, 1.0f};
  41         float light_position[] = {-30.0f, 50.0f, 40.0f, 1.0f};
  42         glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);
  43         glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);
  44         glLightfv(GL_LIGHT0, GL_POSITION, light_position);
  45         glEnable(GL_COLOR_MATERIAL);
  46         glEnable(GL_LIGHTING);
  47         glEnable(GL_LIGHT0);
  48
  49         /* Projection */
  50         glMatrixMode(GL_PROJECTION);
  51         glLoadIdentity();
  52         glFrustum(-1,1, -1,1, 2,10);
  53
  54         glMatrixMode(GL_MODELVIEW);
  55         glLoadIdentity();
  56         gluLookAt(0,2,-3, 0,0,0, 0,1,0);
  57
  58         /* Draw polys */
  59         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
  60
  61         glColor4f(1, 0, 0, 0.5);
  62         glBegin(GL_TRIANGLE_STRIP);
  63         glVertex3i(-1,  1,  1);
  64         glVertex3i(-1, -1,  1);
  65         glVertex3i( 1,  1, -1);
  66         glVertex3i( 1, -1, -1);
  67         glEnd();
  68
  69         glColor4f(0, 1, 0, 0.5);
  70         glBegin(GL_TRIANGLE_STRIP);
  71         glVertex3i( 1,  1,  1);
  72         glVertex3i( 1, -1,  1);
  73         glVertex3i(-1,  1, -1);
  74         glVertex3i(-1, -1, -1);
  75         glEnd();
  76
  77         /* Flush */
  78         GdkGLDrawable *gldrawable = gdk_gl_drawable_get_current();
  79         if (gdk_gl_drawable_is_double_buffered(gldrawable))
  80                 gdk_gl_drawable_swap_buffers(gldrawable);
  81         else
  82                 glFlush();
  83         return FALSE;
  84 }
  85
  86 static gboolean on_configure(GtkWidget *drawing, GdkEventConfigure *event, gpointer _)
  87 {
  88         glViewport(0, 0,
  89                 drawing->allocation.width,
  90                 drawing->allocation.height);
  91         return FALSE;
  92 }
  93
  94 static gboolean on_key_press(GtkWidget *widget, GdkEventKey *event, gpointer _)
  95 {
  96         if (event->keyval == GDK_q)
  97                 gtk_main_quit();
  98         return FALSE;
  99 }
 100
 101 int main(int argc, char **argv)
 102 {
 103         gtk_init(&argc, &argv);
 104
 105         GtkWidget   *window   = gtk_window_new(GTK_WINDOW_TOPLEVEL);
 106         GtkWidget   *drawing  = gtk_drawing_area_new();
 107         GdkGLConfig *glconfig = gdk_gl_config_new_by_mode((GdkGLConfigMode)(
 108                         GDK_GL_MODE_RGBA   | GDK_GL_MODE_DEPTH |
 109                         GDK_GL_MODE_DOUBLE | GDK_GL_MODE_ALPHA));
 110         g_signal_connect(window,  "destroy",         G_CALLBACK(gtk_main_quit), NULL);
 111         g_signal_connect(window,  "key-press-event", G_CALLBACK(on_key_press),  NULL);
 112         g_signal_connect(drawing, "expose-event",    G_CALLBACK(on_expose),     NULL);
 113         g_signal_connect(drawing, "configure-event", G_CALLBACK(on_configure),  NULL);
 114         gtk_widget_set_gl_capability(drawing, glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE);
 115         gtk_container_add(GTK_CONTAINER(window), drawing);
 116         gtk_widget_show_all(window);
 117
 118         /* OpenGL setup */
 119         GdkGLContext  *glcontext  = gtk_widget_get_gl_context(GTK_WIDGET(drawing));
 120         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(drawing));
 121         gdk_gl_drawable_gl_begin(gldrawable, glcontext);
 122
 123         gtk_main();
 124
 125         gdk_gl_drawable_gl_end(gldrawable);
 126 }