libs/gtkutil/glwidget.cpp

   1 /*
   2    Copyright (C) 2001-2006, William Joseph.
   3    All Rights Reserved.
   4
   5    This file is part of GtkRadiant.
   6
   7    GtkRadiant is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    GtkRadiant is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GtkRadiant; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  20  */
  21
  22 // OpenGL widget based on GtkGLExt
  23
  24 #include "glwidget.h"
  25
  26 #include "debugging/debugging.h"
  27
  28 #include "igl.h"
  29
  30 #include <gtk/gtkdrawingarea.h>
  31 #include <gtk/gtkglwidget.h>
  32
  33 #include "pointer.h"
  34
  35 void ( *GLWidget_sharedContextCreated )() = 0;
  36 void ( *GLWidget_sharedContextDestroyed )() = 0;
  37
  38
  39 typedef int* attribs_t;
  40 struct config_t
  41 {
  42         const char* name;
  43         attribs_t attribs;
  44 };
  45 typedef const config_t* configs_iterator;
  46
  47 int config_rgba32[] = {
  48         GDK_GL_RGBA,
  49         GDK_GL_DOUBLEBUFFER,
  50         GDK_GL_BUFFER_SIZE, 24,
  51         GDK_GL_ATTRIB_LIST_NONE,
  52 };
  53
  54 int config_rgba[] = {
  55         GDK_GL_RGBA,
  56         GDK_GL_DOUBLEBUFFER,
  57         GDK_GL_BUFFER_SIZE, 16,
  58         GDK_GL_ATTRIB_LIST_NONE,
  59 };
  60
  61 const config_t configs[] = {
  62         {
  63                 "colour-buffer = 32bpp, depth-buffer = none",
  64                 config_rgba32,
  65         },
  66         {
  67                 "colour-buffer = 16bpp, depth-buffer = none",
  68                 config_rgba,
  69         }
  70 };
  71
  72 GdkGLConfig* glconfig_new(){
  73         GdkGLConfig* glconfig = 0;
  74
  75         for ( configs_iterator i = configs, end = configs + 2; i != end; ++i )
  76         {
  77                 glconfig = gdk_gl_config_new( ( *i ).attribs );
  78                 if ( glconfig != 0 ) {
  79                         globalOutputStream() << "OpenGL window configuration: " << ( *i ).name << "\n";
  80                         return glconfig;
  81                 }
  82         }
  83
  84         globalOutputStream() << "OpenGL window configuration: colour-buffer = auto, depth-buffer = none\n";
  85         return gdk_gl_config_new_by_mode( (GdkGLConfigMode)( GDK_GL_MODE_RGBA | GDK_GL_MODE_DOUBLE ) );
  86 }
  87
  88 int config_rgba32_depth32[] = {
  89         GDK_GL_RGBA,
  90         GDK_GL_DOUBLEBUFFER,
  91         GDK_GL_BUFFER_SIZE, 24,
  92         GDK_GL_DEPTH_SIZE, 32,
  93         GDK_GL_ATTRIB_LIST_NONE,
  94 };
  95
  96 int config_rgba32_depth24[] = {
  97         GDK_GL_RGBA,
  98         GDK_GL_DOUBLEBUFFER,
  99         GDK_GL_BUFFER_SIZE, 24,
 100         GDK_GL_DEPTH_SIZE, 24,
 101         GDK_GL_ATTRIB_LIST_NONE,
 102 };
 103
 104 int config_rgba32_depth16[] = {
 105         GDK_GL_RGBA,
 106         GDK_GL_DOUBLEBUFFER,
 107         GDK_GL_BUFFER_SIZE, 24,
 108         GDK_GL_DEPTH_SIZE, 16,
 109         GDK_GL_ATTRIB_LIST_NONE,
 110 };
 111
 112 int config_rgba32_depth[] = {
 113         GDK_GL_RGBA,
 114         GDK_GL_DOUBLEBUFFER,
 115         GDK_GL_BUFFER_SIZE, 24,
 116         GDK_GL_DEPTH_SIZE, 1,
 117         GDK_GL_ATTRIB_LIST_NONE,
 118 };
 119
 120 int config_rgba_depth16[] = {
 121         GDK_GL_RGBA,
 122         GDK_GL_DOUBLEBUFFER,
 123         GDK_GL_BUFFER_SIZE, 16,
 124         GDK_GL_DEPTH_SIZE, 16,
 125         GDK_GL_ATTRIB_LIST_NONE,
 126 };
 127
 128 int config_rgba_depth[] = {
 129         GDK_GL_RGBA,
 130         GDK_GL_DOUBLEBUFFER,
 131         GDK_GL_BUFFER_SIZE, 16,
 132         GDK_GL_DEPTH_SIZE, 1,
 133         GDK_GL_ATTRIB_LIST_NONE,
 134 };
 135
 136 const config_t configs_with_depth[] =
 137 {
 138         {
 139                 "colour-buffer = 32bpp, depth-buffer = 32bpp",
 140                 config_rgba32_depth32,
 141         },
 142         {
 143                 "colour-buffer = 32bpp, depth-buffer = 24bpp",
 144                 config_rgba32_depth24,
 145         },
 146         {
 147                 "colour-buffer = 32bpp, depth-buffer = 16bpp",
 148                 config_rgba32_depth16,
 149         },
 150         {
 151                 "colour-buffer = 32bpp, depth-buffer = auto",
 152                 config_rgba32_depth,
 153         },
 154         {
 155                 "colour-buffer = 16bpp, depth-buffer = 16bpp",
 156                 config_rgba_depth16,
 157         },
 158         {
 159                 "colour-buffer = auto, depth-buffer = auto",
 160                 config_rgba_depth,
 161         },
 162 };
 163
 164 GdkGLConfig* glconfig_new_with_depth(){
 165         GdkGLConfig* glconfig = 0;
 166
 167         for ( configs_iterator i = configs_with_depth, end = configs_with_depth + 6; i != end; ++i )
 168         {
 169                 glconfig = gdk_gl_config_new( ( *i ).attribs );
 170                 if ( glconfig != 0 ) {
 171                         globalOutputStream() << "OpenGL window configuration: " << ( *i ).name << "\n";
 172                         return glconfig;
 173                 }
 174         }
 175
 176         globalOutputStream() << "OpenGL window configuration: colour-buffer = auto, depth-buffer = auto (fallback)\n";
 177         return gdk_gl_config_new_by_mode( (GdkGLConfigMode)( GDK_GL_MODE_RGBA | GDK_GL_MODE_DOUBLE | GDK_GL_MODE_DEPTH ) );
 178 }
 179
 180 unsigned int g_context_count = 0;
 181
 182 namespace
 183 {
 184 GtkWidget* g_shared = 0;
 185 }
 186
 187 gint glwidget_context_created( GtkWidget* widget, gpointer data ){
 188         if ( ++g_context_count == 1 ) {
 189                 g_shared = widget;
 190                 gtk_widget_ref( g_shared );
 191
 192                 glwidget_make_current( g_shared );
 193                 GlobalOpenGL().contextValid = true;
 194
 195                 GLWidget_sharedContextCreated();
 196         }
 197         return FALSE;
 198 }
 199
 200 gint glwidget_context_destroyed( GtkWidget* widget, gpointer data ){
 201         if ( --g_context_count == 0 ) {
 202                 GlobalOpenGL().contextValid = false;
 203
 204                 GLWidget_sharedContextDestroyed();
 205
 206                 gtk_widget_unref( g_shared );
 207                 g_shared = 0;
 208         }
 209         return FALSE;
 210 }
 211
 212 gboolean glwidget_enable_gl( GtkWidget* widget, GtkWidget* widget2, gpointer data ){
 213         if ( widget2 == 0 && !gtk_widget_is_gl_capable( widget ) ) {
 214                 GdkGLConfig* glconfig = ( g_object_get_data( G_OBJECT( widget ), "zbuffer" ) ) ? glconfig_new_with_depth() : glconfig_new();
 215                 ASSERT_MESSAGE( glconfig != 0, "failed to create OpenGL config" );
 216
 217                 gtk_widget_set_gl_capability( widget, glconfig, g_shared != 0 ? gtk_widget_get_gl_context( g_shared ) : 0,  TRUE, GDK_GL_RGBA_TYPE );
 218
 219                 gtk_widget_realize( widget );
 220                 if ( g_shared == 0 ) {
 221                         g_shared = widget;
 222                 }
 223
 224                 // free glconfig?
 225         }
 226         return FALSE;
 227 }
 228
 229 GtkWidget* glwidget_new( gboolean zbuffer ){
 230         GtkWidget* widget = gtk_drawing_area_new();
 231
 232         g_object_set_data( G_OBJECT( widget ), "zbuffer", gint_to_pointer( zbuffer ) );
 233
 234         g_signal_connect( G_OBJECT( widget ), "hierarchy-changed", G_CALLBACK( glwidget_enable_gl ), 0 );
 235
 236         g_signal_connect( G_OBJECT( widget ), "realize", G_CALLBACK( glwidget_context_created ), 0 );
 237         g_signal_connect( G_OBJECT( widget ), "unrealize", G_CALLBACK( glwidget_context_destroyed ), 0 );
 238
 239         return widget;
 240 }
 241
 242 void glwidget_destroy_context( GtkWidget *widget ){
 243 }
 244
 245 void glwidget_create_context( GtkWidget *widget ){
 246 }
 247
 248 void glwidget_swap_buffers( GtkWidget *widget ){
 249         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable( widget );
 250         gdk_gl_drawable_swap_buffers( gldrawable );
 251 }
 252
 253 gboolean glwidget_make_current( GtkWidget *widget ){
 254         GdkGLContext *glcontext = gtk_widget_get_gl_context( widget );
 255         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable( widget );
 256         return gdk_gl_drawable_gl_begin( gldrawable, glcontext );
 257 }