renderbuffer.c revision 36ede89687fe2de213f2637ab7acfb80cfd856cd 
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 * Default GetPointer routine.  Always return NULL to indicate that
37 * direct buffer access is not supported.
38 */
39static void *
40nop_get_pointer(struct gl_context *ctx, struct gl_renderbuffer *rb, GLint x, GLint y)
41{
42   return NULL;
43}
44
45
46/**
47 * Initialize the fields of a gl_renderbuffer to default values.
48 */
49void
50_mesa_init_renderbuffer(struct gl_renderbuffer *rb, GLuint name)
51{
52   _glthread_INIT_MUTEX(rb->Mutex);
53
54   rb->ClassID = 0;
55   rb->Name = name;
56   rb->RefCount = 0;
57   rb->Delete = _mesa_delete_renderbuffer;
58
59   /* The rest of these should be set later by the caller of this function or
60    * the AllocStorage method:
61    */
62   rb->AllocStorage = NULL;
63
64   rb->Width = 0;
65   rb->Height = 0;
66   rb->InternalFormat = GL_RGBA;
67   rb->Format = MESA_FORMAT_NONE;
68
69   rb->DataType = GL_NONE;
70   rb->Data = NULL;
71
72   /* Point back to ourself so that we don't have to check for Wrapped==NULL
73    * all over the drivers.
74    */
75   rb->Wrapped = rb;
76
77   rb->GetPointer = nop_get_pointer;
78   rb->GetRow = NULL;
79   rb->GetValues = NULL;
80   rb->PutRow = NULL;
81   rb->PutValues = NULL;
82}
83
84
85/**
86 * Allocate a new gl_renderbuffer object.  This can be used for user-created
87 * renderbuffers or window-system renderbuffers.
88 */
89struct gl_renderbuffer *
90_mesa_new_renderbuffer(struct gl_context *ctx, GLuint name)
91{
92   struct gl_renderbuffer *rb = CALLOC_STRUCT(gl_renderbuffer);
93   if (rb) {
94      _mesa_init_renderbuffer(rb, name);
95   }
96   return rb;
97}
98
99
100/**
101 * Delete a gl_framebuffer.
102 * This is the default function for renderbuffer->Delete().
103 */
104void
105_mesa_delete_renderbuffer(struct gl_renderbuffer *rb)
106{
107   if (rb->Data) {
108      free(rb->Data);
109   }
110   free(rb);
111}
112
113
114/**
115 * Attach a renderbuffer to a framebuffer.
116 * \param bufferName  one of the BUFFER_x tokens
117 */
118void
119_mesa_add_renderbuffer(struct gl_framebuffer *fb,
120                       gl_buffer_index bufferName, struct gl_renderbuffer *rb)
121{
122   assert(fb);
123   assert(rb);
124   assert(bufferName < BUFFER_COUNT);
125
126   /* There should be no previous renderbuffer on this attachment point,
127    * with the exception of depth/stencil since the same renderbuffer may
128    * be used for both.
129    */
130   assert(bufferName == BUFFER_DEPTH ||
131          bufferName == BUFFER_STENCIL ||
132          fb->Attachment[bufferName].Renderbuffer == NULL);
133
134   /* winsys vs. user-created buffer cross check */
135   if (_mesa_is_user_fbo(fb)) {
136      assert(rb->Name);
137   }
138   else {
139      assert(!rb->Name);
140   }
141
142   fb->Attachment[bufferName].Type = GL_RENDERBUFFER_EXT;
143   fb->Attachment[bufferName].Complete = GL_TRUE;
144   _mesa_reference_renderbuffer(&fb->Attachment[bufferName].Renderbuffer, rb);
145}
146
147
148/**
149 * Remove the named renderbuffer from the given framebuffer.
150 * \param bufferName  one of the BUFFER_x tokens
151 */
152void
153_mesa_remove_renderbuffer(struct gl_framebuffer *fb,
154                          gl_buffer_index bufferName)
155{
156   assert(bufferName < BUFFER_COUNT);
157   _mesa_reference_renderbuffer(&fb->Attachment[bufferName].Renderbuffer,
158                                NULL);
159}
160
161
162/**
163 * Set *ptr to point to rb.  If *ptr points to another renderbuffer,
164 * dereference that buffer first.  The new renderbuffer's refcount will
165 * be incremented.  The old renderbuffer's refcount will be decremented.
166 * This is normally only called from the _mesa_reference_renderbuffer() macro
167 * when there's a real pointer change.
168 */
169void
170_mesa_reference_renderbuffer_(struct gl_renderbuffer **ptr,
171                              struct gl_renderbuffer *rb)
172{
173   if (*ptr) {
174      /* Unreference the old renderbuffer */
175      GLboolean deleteFlag = GL_FALSE;
176      struct gl_renderbuffer *oldRb = *ptr;
177
178      _glthread_LOCK_MUTEX(oldRb->Mutex);
179      ASSERT(oldRb->RefCount > 0);
180      oldRb->RefCount--;
181      /*printf("RB DECR %p (%d) to %d\n", (void*) oldRb, oldRb->Name, oldRb->RefCount);*/
182      deleteFlag = (oldRb->RefCount == 0);
183      _glthread_UNLOCK_MUTEX(oldRb->Mutex);
184
185      if (deleteFlag) {
186         oldRb->Delete(oldRb);
187      }
188
189      *ptr = NULL;
190   }
191   assert(!*ptr);
192
193   if (rb) {
194      /* reference new renderbuffer */
195      _glthread_LOCK_MUTEX(rb->Mutex);
196      rb->RefCount++;
197      /*printf("RB INCR %p (%d) to %d\n", (void*) rb, rb->Name, rb->RefCount);*/
198      _glthread_UNLOCK_MUTEX(rb->Mutex);
199      *ptr = rb;
200   }
201}
202