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

   1 #include <gtk/gtk.h>
   2 #include <gtk/gtkgl.h>
   3 #include <gdk/gdkkeysyms.h>
   4 #include <GL/gl.h>
   5 #include <GL/glu.h>
   6 #include <stdlib.h>
   7
   8 static gboolean on_expose(GtkWidget *drawing, GdkEventExpose *event, gpointer _)
   9 {
  10         //glClearColor(0.5, 0.5, 1.0, 1.0);
  11         glClearColor(0.0, 0.0, 0.0, 0.0);
  12         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  13
  14         /* No sorting, just add */
  15         glEnable(GL_BLEND);
  16         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  17         //glBlendFunc(GL_ONE, GL_ONE);
  18
  19         /* Lighting */
  20         glMatrixMode(GL_MODELVIEW);
  21         glLoadIdentity();
  22         float light_ambient[]  = {0.3f, 0.3f, 0.1f, 1.0f};
  23         float light_diffuse[]  = {0.9f, 0.9f, 0.9f, 1.0f};
  24         float light_position[] = {-30.0f, 50.0f, 40.0f, 1.0f};
  25         glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);
  26         glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);
  27         glLightfv(GL_LIGHT0, GL_POSITION, light_position);
  28         glEnable(GL_COLOR_MATERIAL);
  29         glEnable(GL_LIGHTING);
  30         glEnable(GL_LIGHT0);
  31
  32         /* Projection */
  33         glMatrixMode(GL_PROJECTION);
  34         glLoadIdentity();
  35         glFrustum(-1,1, -1,1, 2,10);
  36
  37         glMatrixMode(GL_MODELVIEW);
  38         glLoadIdentity();
  39         gluLookAt(0,2,-3, 0,0,0, 0,1,0);
  40
  41         /* Draw polys */
  42         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
  43
  44         glColor4f(1, 0, 0, 0.5);
  45         glBegin(GL_TRIANGLE_STRIP);
  46         glVertex3i(-1,  1,  1);
  47         glVertex3i(-1, -1,  1);
  48         glVertex3i( 1,  1, -1);
  49         glVertex3i( 1, -1, -1);
  50         glEnd();
  51
  52         glColor4f(0, 1, 0, 0.5);
  53         glBegin(GL_TRIANGLE_STRIP);
  54         glVertex3i( 1,  1,  1);
  55         glVertex3i( 1, -1,  1);
  56         glVertex3i(-1,  1, -1);
  57         glVertex3i(-1, -1, -1);
  58         glEnd();
  59
  60         /* Flush */
  61         GdkGLDrawable *gldrawable = gdk_gl_drawable_get_current();
  62         if (gdk_gl_drawable_is_double_buffered(gldrawable))
  63                 gdk_gl_drawable_swap_buffers(gldrawable);
  64         else
  65                 glFlush();
  66         return FALSE;
  67 }
  68
  69 static gboolean on_configure(GtkWidget *drawing, GdkEventConfigure *event, gpointer _)
  70 {
  71         glViewport(0, 0,
  72                 drawing->allocation.width,
  73                 drawing->allocation.height);
  74         return FALSE;
  75 }
  76
  77 static gboolean on_key_press(GtkWidget *widget, GdkEventKey *event, gpointer _)
  78 {
  79         if (event->keyval == GDK_q)
  80                 gtk_main_quit();
  81         return FALSE;
  82 }
  83
  84 int main(int argc, char **argv)
  85 {
  86         gtk_init(&argc, &argv);
  87
  88         GtkWidget   *window   = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  89         GtkWidget   *drawing  = gtk_drawing_area_new();
  90         GdkGLConfig *glconfig = gdk_gl_config_new_by_mode((GdkGLConfigMode)(
  91                         GDK_GL_MODE_RGBA   | GDK_GL_MODE_DEPTH |
  92                         GDK_GL_MODE_DOUBLE | GDK_GL_MODE_ALPHA));
  93         g_signal_connect(window,  "destroy",         G_CALLBACK(gtk_main_quit), NULL);
  94         g_signal_connect(window,  "key-press-event", G_CALLBACK(on_key_press),  NULL);
  95         g_signal_connect(drawing, "expose-event",    G_CALLBACK(on_expose),     NULL);
  96         g_signal_connect(drawing, "configure-event", G_CALLBACK(on_configure),  NULL);
  97         gtk_widget_set_gl_capability(drawing, glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE);
  98         gtk_container_add(GTK_CONTAINER(window), drawing);
  99         gtk_widget_show_all(window);
 100
 101         /* OpenGL setup */
 102         GdkGLContext  *glcontext  = gtk_widget_get_gl_context(GTK_WIDGET(drawing));
 103         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(drawing));
 104         gdk_gl_drawable_gl_begin(gldrawable, glcontext);
 105
 106         gtk_main();
 107
 108         gdk_gl_drawable_gl_end(gldrawable);
 109 }