src/mesa/main/renderbuffer.c

   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  */
  38 void
  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    rb->DataType = GL_NONE;
  59    rb->Data = NULL;
  60
  61    /* Point back to ourself so that we don't have to check for Wrapped==NULL
  62     * all over the drivers.
  63     */
  64    rb->Wrapped = rb;
  65 }
  66
  67
  68 /**
  69  * Allocate a new gl_renderbuffer object.  This can be used for user-created
  70  * renderbuffers or window-system renderbuffers.
  71  */
  72 struct gl_renderbuffer *
  73 _mesa_new_renderbuffer(struct gl_context *ctx, GLuint name)
  74 {
  75    struct gl_renderbuffer *rb = CALLOC_STRUCT(gl_renderbuffer);
  76    if (rb) {
  77       _mesa_init_renderbuffer(rb, name);
  78    }
  79    return rb;
  80 }
  81
  82
  83 /**
  84  * Delete a gl_framebuffer.
  85  * This is the default function for renderbuffer->Delete().
  86  */
  87 void
  88 _mesa_delete_renderbuffer(struct gl_renderbuffer *rb)
  89 {
  90    if (rb->Data) {
  91       free(rb->Data);
  92    }
  93    free(rb);
  94 }
  95
  96
  97 /**
  98  * Attach a renderbuffer to a framebuffer.
  99  * \param bufferName  one of the BUFFER_x tokens
 100  */
 101 void
 102 _mesa_add_renderbuffer(struct gl_framebuffer *fb,
 103                        gl_buffer_index bufferName, struct gl_renderbuffer *rb)
 104 {
 105    assert(fb);
 106    assert(rb);
 107    assert(bufferName < BUFFER_COUNT);
 108
 109    /* There should be no previous renderbuffer on this attachment point,
 110     * with the exception of depth/stencil since the same renderbuffer may
 111     * be used for both.
 112     */
 113    assert(bufferName == BUFFER_DEPTH ||
 114           bufferName == BUFFER_STENCIL ||
 115           fb->Attachment[bufferName].Renderbuffer == NULL);
 116
 117    /* winsys vs. user-created buffer cross check */
 118    if (_mesa_is_user_fbo(fb)) {
 119       assert(rb->Name);
 120    }
 121    else {
 122       assert(!rb->Name);
 123    }
 124
 125    fb->Attachment[bufferName].Type = GL_RENDERBUFFER_EXT;
 126    fb->Attachment[bufferName].Complete = GL_TRUE;
 127    _mesa_reference_renderbuffer(&fb->Attachment[bufferName].Renderbuffer, rb);
 128 }
 129
 130
 131 /**
 132  * Remove the named renderbuffer from the given framebuffer.
 133  * \param bufferName  one of the BUFFER_x tokens
 134  */
 135 void
 136 _mesa_remove_renderbuffer(struct gl_framebuffer *fb,
 137                           gl_buffer_index bufferName)
 138 {
 139    assert(bufferName < BUFFER_COUNT);
 140    _mesa_reference_renderbuffer(&fb->Attachment[bufferName].Renderbuffer,
 141                                 NULL);
 142 }
 143
 144
 145 /**
 146  * Set *ptr to point to rb.  If *ptr points to another renderbuffer,
 147  * dereference that buffer first.  The new renderbuffer's refcount will
 148  * be incremented.  The old renderbuffer's refcount will be decremented.
 149  * This is normally only called from the _mesa_reference_renderbuffer() macro
 150  * when there's a real pointer change.
 151  */
 152 void
 153 _mesa_reference_renderbuffer_(struct gl_renderbuffer **ptr,
 154                               struct gl_renderbuffer *rb)
 155 {
 156    if (*ptr) {
 157       /* Unreference the old renderbuffer */
 158       GLboolean deleteFlag = GL_FALSE;
 159       struct gl_renderbuffer *oldRb = *ptr;
 160
 161       _glthread_LOCK_MUTEX(oldRb->Mutex);
 162       ASSERT(oldRb->RefCount > 0);
 163       oldRb->RefCount--;
 164       /*printf("RB DECR %p (%d) to %d\n", (void*) oldRb, oldRb->Name, oldRb->RefCount);*/
 165       deleteFlag = (oldRb->RefCount == 0);
 166       _glthread_UNLOCK_MUTEX(oldRb->Mutex);
 167
 168       if (deleteFlag) {
 169          oldRb->Delete(oldRb);
 170       }
 171
 172       *ptr = NULL;
 173    }
 174    assert(!*ptr);
 175
 176    if (rb) {
 177       /* reference new renderbuffer */
 178       _glthread_LOCK_MUTEX(rb->Mutex);
 179       rb->RefCount++;
 180       /*printf("RB INCR %p (%d) to %d\n", (void*) rb, rb->Name, rb->RefCount);*/
 181       _glthread_UNLOCK_MUTEX(rb->Mutex);
 182       *ptr = rb;
 183    }
 184 }