renderbuffer.c revision f6a3979a0444a14c198c10501e9ff13f24625443 
1/*
2 * Mesa 3-D graphics library
3 * Version:  6.5
4 *
5 * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25
26#include "glheader.h"
27#include "imports.h"
28#include "context.h"
29#include "fbobject.h"
30#include "formats.h"
31#include "mtypes.h"
32#include "renderbuffer.h"
33
34
35/**
36 * Initialize the fields of a gl_renderbuffer to default values.
37 */
38void
39_mesa_init_renderbuffer(struct gl_renderbuffer *rb, GLuint name)
40{
41   _glthread_INIT_MUTEX(rb->Mutex);
42
43   rb->ClassID = 0;
44   rb->Name = name;
45   rb->RefCount = 0;
46   rb->Delete = _mesa_delete_renderbuffer;
47
48   /* The rest of these should be set later by the caller of this function or
49    * the AllocStorage method:
50    */
51   rb->AllocStorage = NULL;
52
53   rb->Width = 0;
54   rb->Height = 0;
55   rb->InternalFormat = GL_RGBA;
56   rb->Format = MESA_FORMAT_NONE;
57
58   /* Point back to ourself so that we don't have to check for Wrapped==NULL
59    * all over the drivers.
60    */
61   rb->Wrapped = rb;
62}
63
64
65/**
66 * Allocate a new gl_renderbuffer object.  This can be used for user-created
67 * renderbuffers or window-system renderbuffers.
68 */
69struct gl_renderbuffer *
70_mesa_new_renderbuffer(struct gl_context *ctx, GLuint name)
71{
72   struct gl_renderbuffer *rb = CALLOC_STRUCT(gl_renderbuffer);
73   if (rb) {
74      _mesa_init_renderbuffer(rb, name);
75   }
76   return rb;
77}
78
79
80/**
81 * Delete a gl_framebuffer.
82 * This is the default function for renderbuffer->Delete().
83 */
84void
85_mesa_delete_renderbuffer(struct gl_renderbuffer *rb)
86{
87   /* no-op */
88}
89
90
91/**
92 * Attach a renderbuffer to a framebuffer.
93 * \param bufferName  one of the BUFFER_x tokens
94 */
95void
96_mesa_add_renderbuffer(struct gl_framebuffer *fb,
97                       gl_buffer_index bufferName, struct gl_renderbuffer *rb)
98{
99   assert(fb);
100   assert(rb);
101   assert(bufferName < BUFFER_COUNT);
102
103   /* There should be no previous renderbuffer on this attachment point,
104    * with the exception of depth/stencil since the same renderbuffer may
105    * be used for both.
106    */
107   assert(bufferName == BUFFER_DEPTH ||
108          bufferName == BUFFER_STENCIL ||
109          fb->Attachment[bufferName].Renderbuffer == NULL);
110
111   /* winsys vs. user-created buffer cross check */
112   if (_mesa_is_user_fbo(fb)) {
113      assert(rb->Name);
114   }
115   else {
116      assert(!rb->Name);
117   }
118
119   fb->Attachment[bufferName].Type = GL_RENDERBUFFER_EXT;
120   fb->Attachment[bufferName].Complete = GL_TRUE;
121   _mesa_reference_renderbuffer(&fb->Attachment[bufferName].Renderbuffer, rb);
122}
123
124
125/**
126 * Remove the named renderbuffer from the given framebuffer.
127 * \param bufferName  one of the BUFFER_x tokens
128 */
129void
130_mesa_remove_renderbuffer(struct gl_framebuffer *fb,
131                          gl_buffer_index bufferName)
132{
133   assert(bufferName < BUFFER_COUNT);
134   _mesa_reference_renderbuffer(&fb->Attachment[bufferName].Renderbuffer,
135                                NULL);
136}
137
138
139/**
140 * Set *ptr to point to rb.  If *ptr points to another renderbuffer,
141 * dereference that buffer first.  The new renderbuffer's refcount will
142 * be incremented.  The old renderbuffer's refcount will be decremented.
143 * This is normally only called from the _mesa_reference_renderbuffer() macro
144 * when there's a real pointer change.
145 */
146void
147_mesa_reference_renderbuffer_(struct gl_renderbuffer **ptr,
148                              struct gl_renderbuffer *rb)
149{
150   if (*ptr) {
151      /* Unreference the old renderbuffer */
152      GLboolean deleteFlag = GL_FALSE;
153      struct gl_renderbuffer *oldRb = *ptr;
154
155      _glthread_LOCK_MUTEX(oldRb->Mutex);
156      ASSERT(oldRb->RefCount > 0);
157      oldRb->RefCount--;
158      /*printf("RB DECR %p (%d) to %d\n", (void*) oldRb, oldRb->Name, oldRb->RefCount);*/
159      deleteFlag = (oldRb->RefCount == 0);
160      _glthread_UNLOCK_MUTEX(oldRb->Mutex);
161
162      if (deleteFlag) {
163         oldRb->Delete(oldRb);
164      }
165
166      *ptr = NULL;
167   }
168   assert(!*ptr);
169
170   if (rb) {
171      /* reference new renderbuffer */
172      _glthread_LOCK_MUTEX(rb->Mutex);
173      rb->RefCount++;
174      /*printf("RB INCR %p (%d) to %d\n", (void*) rb, rb->Name, rb->RefCount);*/
175      _glthread_UNLOCK_MUTEX(rb->Mutex);
176      *ptr = rb;
177   }
178}
179