summaryrefslogtreecommitdiff
path: root/linux/gdkgl.c
blob: 3d326a56b5246ce7bd0c8176565f9310cc268387 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
/* 
 * Copyright (C) 1998 Janne Lof <jlof@mail.student.oulu.fi>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */


#include "gdkgl.h"

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#include <gdk/gdkx.h>
#ifdef __cplusplus
}
#endif /* __cplusplus */

#include <GL/gl.h>
#include <GL/glx.h>
#include <string.h>


static XVisualInfo *get_xvisualinfo(GdkVisual *visual)
{
  Display *dpy;
  XVisualInfo vinfo_template;
  XVisualInfo *vi;
  int nitems_return;

  dpy = GDK_DISPLAY();

  /* TODO: is this right way to get VisualInfo from Visual ?? */
  /* AFAIK VisualID and depth should be enough to uniquely identify visual */
  vinfo_template.visual   = GDK_VISUAL_XVISUAL(visual);
  vinfo_template.visualid = XVisualIDFromVisual(vinfo_template.visual);
  vinfo_template.depth    = visual->depth;
  vi = XGetVisualInfo(dpy, VisualIDMask|VisualDepthMask, &vinfo_template, &nitems_return);

  g_assert( vi!=0  && nitems_return==1 ); /* visualinfo needs to be unique */

  /* remember to XFree returned XVisualInfo !!! */
  return vi;
}


struct _GdkGLContextPrivate {
  Display    *xdisplay;
  GLXContext glxcontext;
  guint ref_count;
};

typedef struct _GdkGLContextPrivate GdkGLContextPrivate;


gint gdk_gl_query(void)
{
  return (glXQueryExtension(GDK_DISPLAY(),NULL,NULL) == True) ? TRUE : FALSE;
}

GdkVisual *gdk_gl_choose_visual(int *attrList)
{
  Display *dpy;
  XVisualInfo *vi;
  GdkVisual  *visual;

  g_return_val_if_fail(attrList != NULL, NULL);

  dpy = GDK_DISPLAY();
  /* TODO:  translate GDK_GL_ to GLX_ */
  if ((vi = glXChooseVisual(dpy,DefaultScreen(dpy), attrList)) == NULL) {
    return NULL;
  }
  visual = gdkx_visual_get(vi->visualid);
  XFree(vi);
  return visual;
}


int gdk_gl_get_config(GdkVisual *visual, int attrib)
{
  Display *dpy;
  XVisualInfo *vi;
  int value;
  
  g_return_val_if_fail(visual != NULL, -1);

  dpy = GDK_DISPLAY();
 
  vi = get_xvisualinfo(visual);

  /* TODO:  translate GDK_GL_ to GLX_ */
  if (glXGetConfig(dpy, vi, attrib, &value) == 0) {
    XFree(vi);
    return value;
  }
  XFree(vi);
  return -1;
}


GdkGLContext *gdk_gl_context_new(GdkVisual *visual)
{
  return gdk_gl_context_share_new(visual, NULL, FALSE);
}

GdkGLContext *gdk_gl_context_share_new(GdkVisual *visual, GdkGLContext *sharelist, gint direct)
{
  Display *dpy;
  XVisualInfo *vi;
  GLXContext glxcontext;
  GdkGLContextPrivate *contextprivate;

  g_return_val_if_fail(visual != NULL, NULL);

  dpy = GDK_DISPLAY();

  vi = get_xvisualinfo(visual);

  if (sharelist) {
    glxcontext = glXCreateContext(dpy, vi, ((GdkGLContextPrivate*)sharelist)->glxcontext, direct ? True : False);
  } else {
    glxcontext = glXCreateContext(dpy, vi, 0, direct ? True : False);
  }
  XFree(vi);
  if (glxcontext == NULL) {
    return NULL;
  }

  contextprivate = g_new(GdkGLContextPrivate, 1);
  contextprivate->xdisplay = dpy;
  contextprivate->glxcontext = glxcontext;
  contextprivate->ref_count = 1;

  return (GdkGLContext*)contextprivate;
}

GdkGLContext *gdk_gl_context_ref(GdkGLContext *context)
{
  GdkGLContextPrivate *contextprivate = (GdkGLContextPrivate*)context;

  g_return_val_if_fail(context != NULL, NULL);
  contextprivate->ref_count += 1;

  return context;
}

void gdk_gl_context_unref(GdkGLContext *context)
{
  GdkGLContextPrivate *contextprivate = (GdkGLContextPrivate*)context;

  g_return_if_fail(context != NULL);

  if (contextprivate->ref_count > 1) {
    contextprivate->ref_count -= 1;
  } else {
    if (contextprivate->glxcontext == glXGetCurrentContext())
      glXMakeCurrent(contextprivate->xdisplay, None, NULL);
    glXDestroyContext(contextprivate->xdisplay, contextprivate->glxcontext);
    memset(context, 0, sizeof(GdkGLContextPrivate));
    g_free(context);
  }
}

gint gdk_gl_make_current(GdkDrawable *drawable, GdkGLContext *context)
{
  GdkGLContextPrivate *contextprivate = (GdkGLContextPrivate*)context;

  g_return_val_if_fail(drawable != NULL, FALSE);
  g_return_val_if_fail(context  != NULL, FALSE);

  return (glXMakeCurrent(contextprivate->xdisplay, GDK_WINDOW_XWINDOW(drawable), contextprivate->glxcontext) == True) ? TRUE : FALSE;
}

void gdk_gl_swap_buffers(GdkDrawable *drawable)
{
  g_return_if_fail(drawable != NULL);

  glXSwapBuffers(GDK_WINDOW_XDISPLAY(drawable), GDK_WINDOW_XWINDOW(drawable));
}

void gdk_gl_wait_gdk(void)
{
  glXWaitX();
}

void gdk_gl_wait_gl (void)
{
  glXWaitGL();
}


/* glpixmap stuff */

struct _GdkGLPixmapPrivate {
  Display   *xdisplay;
  GLXPixmap glxpixmap;
  GdkPixmap *front_left;
  guint     ref_count;
};

typedef struct _GdkGLPixmapPrivate GdkGLPixmapPrivate;


GdkGLPixmap *gdk_gl_pixmap_new(GdkVisual *visual, GdkPixmap *pixmap)
{
  Display *dpy;
  XVisualInfo *vi;
  Pixmap xpixmap;
  GdkGLPixmapPrivate *contextprivate;
  GLXPixmap glxpixmap;
  gint depth;

  g_return_val_if_fail(pixmap != NULL, NULL);
  g_return_val_if_fail(visual != NULL, NULL);
  g_return_val_if_fail(gdk_window_get_type(pixmap) == GDK_WINDOW_PIXMAP, NULL);

  gdk_window_get_geometry(pixmap, 0,0,0,0, &depth);
  g_return_val_if_fail(gdk_gl_get_config(visual, GDK_GL_BUFFER_SIZE) == depth, NULL);

  dpy = GDK_DISPLAY();

  vi = get_xvisualinfo(visual);
  xpixmap = ((GdkPixmapPrivate*)pixmap)->xwindow;
  glxpixmap = glXCreateGLXPixmap(dpy, vi, xpixmap);
  XFree(vi);

  g_return_val_if_fail(glxpixmap != None, NULL);

  contextprivate = g_new(GdkGLPixmapPrivate, 1);
  contextprivate->xdisplay  = dpy;
  contextprivate->glxpixmap = glxpixmap;
  contextprivate->front_left = gdk_pixmap_ref(pixmap);
  contextprivate->ref_count = 1;

  return (GdkGLPixmap*)contextprivate;
}


GdkGLPixmap *gdk_gl_pixmap_ref(GdkGLPixmap *glpixmap)
{
  GdkGLPixmapPrivate *contextprivate = (GdkGLPixmapPrivate*)glpixmap;

  g_return_val_if_fail(glpixmap != NULL, NULL);
  contextprivate->ref_count += 1;

  return glpixmap;
}

void gdk_gl_pixmap_unref(GdkGLPixmap *glpixmap)
{
  GdkGLPixmapPrivate *contextprivate = (GdkGLPixmapPrivate*)glpixmap;

  g_return_if_fail(glpixmap != NULL);

  if (contextprivate->ref_count > 1) {
    contextprivate->ref_count -= 1;
  } else {
    glXDestroyGLXPixmap(contextprivate->xdisplay, contextprivate->glxpixmap);
    glXWaitGL();
    gdk_pixmap_unref(contextprivate->front_left);
    glXWaitX();
    memset(glpixmap, 0, sizeof(GdkGLPixmapPrivate));
    g_free(glpixmap);
  }
}

gint gdk_gl_pixmap_make_current(GdkGLPixmap *glpixmap, GdkGLContext *context)
{
  Display  *dpy;
  GLXPixmap glxpixmap;
  GLXContext glxcontext;

  g_return_val_if_fail(glpixmap != NULL, FALSE);
  g_return_val_if_fail(context  != NULL, FALSE);

  dpy        = ((GdkGLContextPrivate*)context)->xdisplay;
  glxpixmap  = ((GdkGLPixmapPrivate*)glpixmap)->glxpixmap;
  glxcontext = ((GdkGLContextPrivate*)context)->glxcontext;

  return (glXMakeCurrent(dpy, glxpixmap, glxcontext) == True) ? TRUE : FALSE;
}

/* fonts */
void gdk_gl_use_gdk_font(GdkFont *font, int first, int count, int list_base)
{
  g_return_if_fail(font != NULL);
  glXUseXFont(gdk_font_id(font), first, count, list_base);
}