Pileus Git - grits/blob - examples/tester.c

   1 /*
   2  * Copyright (C) 2009-2011 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 #include <math.h>
  25
  26 #include "tester.h"
  27
  28 /*************
  29  * Callbacks *
  30  *************/
  31 static gboolean on_expose(GritsTester *tester, GdkEventExpose *event, gpointer _)
  32 {
  33         g_debug("GritsTester: on_expose");
  34
  35         glClearColor(0.0, 0.0, 0.0, 0.0);
  36         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  37         glClearDepth(1.0);
  38         glEnable(GL_BLEND);
  39
  40         glEnable(GL_DEPTH_TEST);
  41         glDepthFunc(GL_LEQUAL);
  42         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  43
  44         //glDisable(GL_DEPTH_TEST);
  45         //glBlendFunc(GL_SRC_ALPHA, GL_ONE);
  46
  47         /* Lighting */
  48         glMatrixMode(GL_MODELVIEW);
  49         glPushMatrix();
  50         glLoadIdentity();
  51         float light_ambient[]  = {0.1f, 0.1f, 0.1f, 1.0f};
  52         float light_diffuse[]  = {0.6f, 0.6f, 0.8f, 1.0f};
  53         float light_position[] = {-40.0f, 80.0f, 40.0f, 1.0f};
  54         glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);
  55         glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);
  56         glLightfv(GL_LIGHT0, GL_POSITION, light_position);
  57         glEnable(GL_COLOR_MATERIAL);
  58         glEnable(GL_LIGHTING);
  59         glEnable(GL_LIGHT0);
  60         glPopMatrix();
  61
  62         glColor4f(1.0f, 1.0f, 1.0f, 0.5f);
  63
  64         /* Draw */
  65         gdk_gl_draw_cube(FALSE, 2);
  66         glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
  67         for (GList *cur = tester->objects; cur; cur = cur->next)
  68                 grits_object_draw(cur->data, NULL);
  69         if (tester->wireframe) {
  70                 glDisable(GL_LIGHTING);
  71                 glEnable(GL_POLYGON_OFFSET_LINE);
  72                 glPolygonOffset(-1,0);
  73                 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
  74                 for (GList *cur = tester->objects; cur; cur = cur->next)
  75                         grits_object_draw(cur->data, NULL);
  76         }
  77
  78         /* Flush */
  79         GdkGLDrawable *gldrawable = gdk_gl_drawable_get_current();
  80         gdk_gl_drawable_swap_buffers(gldrawable);
  81         return FALSE;
  82 }
  83
  84 static gboolean on_key_press(GritsTester *tester, GdkEventKey *event, gpointer _)
  85 {
  86         g_debug("GritsTester: on_key_press");
  87         guint kv = event->keyval;
  88         gdouble model[16];
  89         glGetDoublev(GL_MODELVIEW_MATRIX, model);
  90
  91         glMatrixMode(GL_MODELVIEW);
  92         glLoadIdentity();
  93              if (kv == GDK_q) gtk_main_quit();
  94         else if (kv == GDK_w) tester->wireframe = !tester->wireframe;
  95         else if (kv == GDK_h) glTranslated( 0.1,  0,  0);
  96         else if (kv == GDK_l) glTranslated(-0.1,  0,  0);
  97         else if (kv == GDK_j) glTranslated( 0,  0.1,  0);
  98         else if (kv == GDK_k) glTranslated( 0, -0.1,  0);
  99         else if (kv == GDK_i) glTranslated( 0,  0,  0.1);
 100         else if (kv == GDK_o) glTranslated( 0,  0, -0.1);
 101         else if (kv == GDK_H) glRotated(-5, 0,1,0);
 102         else if (kv == GDK_L) glRotated( 5, 0,1,0);
 103         else if (kv == GDK_J) glRotated( 5, 1,0,0);
 104         else if (kv == GDK_K) glRotated(-5, 1,0,0);
 105         else if (kv == GDK_I) glRotated(-5, 0,0,1);
 106         else if (kv == GDK_O) glRotated( 5, 0,0,1);
 107         glMultMatrixd(model);
 108
 109         gtk_widget_queue_draw(GTK_WIDGET(tester));
 110         return FALSE;
 111 }
 112
 113 static gboolean on_configure(GritsTester *tester, GdkEventConfigure *event, gpointer _)
 114 {
 115         g_debug("GritsTester: on_configure");
 116
 117         double width  = GTK_WIDGET(tester)->allocation.width;
 118         double height = GTK_WIDGET(tester)->allocation.height;
 119
 120         /* Setup OpenGL Window */
 121         glViewport(0, 0, width, height);
 122         glMatrixMode(GL_PROJECTION);
 123         glLoadIdentity();
 124         double ang = atan(height/FOV_DIST);
 125         gluPerspective(rad2deg(ang)*2, width/height, 0.001, 100);
 126
 127         return FALSE;
 128 }
 129
 130 static void on_realize(GritsTester *tester, gpointer _)
 131 {
 132         g_debug("GritsTester: on_realize");
 133
 134         /* Start OpenGL */
 135         GdkGLContext   *glcontext  = gtk_widget_get_gl_context(GTK_WIDGET(tester));
 136         GdkGLDrawable  *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(tester));
 137         if (!gdk_gl_drawable_gl_begin(gldrawable, glcontext))
 138                 g_assert_not_reached();
 139
 140         /* Connect signals and idle functions now that opengl is fully initialized */
 141         g_object_set(tester, "can-focus", TRUE, NULL);
 142         gtk_widget_add_events(GTK_WIDGET(tester), GDK_KEY_PRESS_MASK);
 143         g_signal_connect(tester, "configure-event", G_CALLBACK(on_configure), NULL);
 144         g_signal_connect(tester, "expose-event",    G_CALLBACK(on_expose),    NULL);
 145         g_signal_connect(tester, "key-press-event", G_CALLBACK(on_key_press), NULL);
 146
 147         /* Re-queue resize incase configure was triggered before realize */
 148         gtk_widget_queue_resize(GTK_WIDGET(tester));
 149
 150         /* Setup model view matrix */
 151         glMatrixMode(GL_MODELVIEW);
 152         glLoadIdentity();
 153         glTranslated(0, 0, -2);
 154 }
 155
 156 /***********
 157  * Methods *
 158  ***********/
 159 gpointer grits_tester_add(GritsTester *tester, GritsObject *object)
 160 {
 161         g_debug("GritsTester: add");
 162         gtk_widget_queue_draw(GTK_WIDGET(tester));
 163         object->viewer = (void*)tester;
 164         return tester->objects = g_list_prepend(tester->objects, object);
 165 }
 166
 167 GritsObject *grits_tester_remove(GritsTester *tester, gpointer _ref)
 168 {
 169         g_debug("GritsTester: remove");
 170         GList *ref = _ref;
 171         GritsObject *object = ref->data;
 172         tester->objects = g_list_remove_link(tester->objects, ref);
 173         return object;
 174 }
 175
 176 GritsTester *grits_tester_new()
 177 {
 178         g_debug("GritsTester: new");
 179         GritsTester *tester = g_object_new(GRITS_TYPE_TESTER, NULL);
 180         return tester;
 181 }
 182
 183 /****************
 184  * GObject code *
 185  ****************/
 186 G_DEFINE_TYPE(GritsTester, grits_tester, GTK_TYPE_DRAWING_AREA);
 187 static void grits_tester_init(GritsTester *tester)
 188 {
 189         g_debug("GritsTester: init");
 190         tester->objects = NULL;
 191
 192         /* Set OpenGL before "realize" */
 193         GdkGLConfig *glconfig = gdk_gl_config_new_by_mode(
 194                         GDK_GL_MODE_RGBA   | GDK_GL_MODE_DEPTH |
 195                         GDK_GL_MODE_DOUBLE | GDK_GL_MODE_ALPHA);
 196         if (!glconfig)
 197                 g_error("Failed to create glconfig");
 198         if (!gtk_widget_set_gl_capability(GTK_WIDGET(tester),
 199                                 glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE))
 200                 g_error("GL lacks required capabilities");
 201         g_object_unref(glconfig);
 202
 203         /* Finish OpenGL init after it's realized */
 204         g_signal_connect(tester, "realize", G_CALLBACK(on_realize), NULL);
 205 }
 206 static void grits_tester_class_init(GritsTesterClass *klass)
 207 {
 208         g_debug("GritsTester: class_init");
 209 }