reactos/dll/opengl/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 #include <precomp.h>
  26
  27 /**
  28  * Initialize the fields of a gl_renderbuffer to default values.
  29  */
  30 void
  31 _mesa_init_renderbuffer(struct gl_renderbuffer *rb, GLuint name)
  32 {
  33    _glthread_INIT_MUTEX(rb->Mutex);
  34
  35    rb->ClassID = 0;
  36    rb->RefCount = 0;
  37    rb->Delete = _mesa_delete_renderbuffer;
  38
  39    /* The rest of these should be set later by the caller of this function or
  40     * the AllocStorage method:
  41     */
  42    rb->AllocStorage = NULL;
  43
  44    rb->Width = 0;
  45    rb->Height = 0;
  46    rb->InternalFormat = GL_RGBA;
  47    rb->Format = MESA_FORMAT_NONE;
  48 }
  49
  50
  51 /**
  52  * Delete a gl_framebuffer.
  53  * This is the default function for renderbuffer->Delete().
  54  */
  55 void
  56 _mesa_delete_renderbuffer(struct gl_renderbuffer *rb)
  57 {
  58    /* no-op */
  59 }
  60
  61
  62 /**
  63  * Attach a renderbuffer to a framebuffer.
  64  * \param bufferName  one of the BUFFER_x tokens
  65  */
  66 void
  67 _mesa_add_renderbuffer(struct gl_framebuffer *fb,
  68                        gl_buffer_index bufferName, struct gl_renderbuffer *rb)
  69 {
  70    assert(fb);
  71    assert(rb);
  72    assert(bufferName < BUFFER_COUNT);
  73
  74    /* There should be no previous renderbuffer on this attachment point,
  75     * with the exception of depth/stencil since the same renderbuffer may
  76     * be used for both.
  77     */
  78    assert(bufferName == BUFFER_DEPTH ||
  79           bufferName == BUFFER_STENCIL ||
  80           fb->Attachment[bufferName].Renderbuffer == NULL);
  81
  82    _mesa_reference_renderbuffer(&fb->Attachment[bufferName].Renderbuffer, rb);
  83 }
  84
  85
  86 /**
  87  * Remove the named renderbuffer from the given framebuffer.
  88  * \param bufferName  one of the BUFFER_x tokens
  89  */
  90 void
  91 _mesa_remove_renderbuffer(struct gl_framebuffer *fb,
  92                           gl_buffer_index bufferName)
  93 {
  94    assert(bufferName < BUFFER_COUNT);
  95    _mesa_reference_renderbuffer(&fb->Attachment[bufferName].Renderbuffer,
  96                                 NULL);
  97 }
  98
  99
 100 /**
 101  * Set *ptr to point to rb.  If *ptr points to another renderbuffer,
 102  * dereference that buffer first.  The new renderbuffer's refcount will
 103  * be incremented.  The old renderbuffer's refcount will be decremented.
 104  * This is normally only called from the _mesa_reference_renderbuffer() macro
 105  * when there's a real pointer change.
 106  */
 107 void
 108 _mesa_reference_renderbuffer_(struct gl_renderbuffer **ptr,
 109                               struct gl_renderbuffer *rb)
 110 {
 111    if (*ptr) {
 112       /* Unreference the old renderbuffer */
 113       GLboolean deleteFlag = GL_FALSE;
 114       struct gl_renderbuffer *oldRb = *ptr;
 115
 116       _glthread_LOCK_MUTEX(oldRb->Mutex);
 117       ASSERT(oldRb->RefCount > 0);
 118       oldRb->RefCount--;
 119       /*printf("RB DECR %p (%d) to %d\n", (void*) oldRb, oldRb->Name, oldRb->RefCount);*/
 120       deleteFlag = (oldRb->RefCount == 0);
 121       _glthread_UNLOCK_MUTEX(oldRb->Mutex);
 122
 123       if (deleteFlag) {
 124          oldRb->Delete(oldRb);
 125       }
 126
 127       *ptr = NULL;
 128    }
 129    assert(!*ptr);
 130
 131    if (rb) {
 132       /* reference new renderbuffer */
 133       _glthread_LOCK_MUTEX(rb->Mutex);
 134       rb->RefCount++;
 135       /*printf("RB INCR %p (%d) to %d\n", (void*) rb, rb->Name, rb->RefCount);*/
 136       _glthread_UNLOCK_MUTEX(rb->Mutex);
 137       *ptr = rb;
 138    }
 139 }