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  1. /*
  2.  * Mesa 3-D graphics library
  3.  *
  4.  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
  5.  *
  6.  * Permission is hereby granted, free of charge, to any person obtaining a
  7.  * copy of this software and associated documentation files (the "Software"),
  8.  * to deal in the Software without restriction, including without limitation
  9.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10.  * and/or sell copies of the Software, and to permit persons to whom the
  11.  * Software is furnished to do so, subject to the following conditions:
  12.  *
  13.  * The above copyright notice and this permission notice shall be included
  14.  * in all copies or substantial portions of the Software.
  15.  *
  16.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17.  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20.  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21.  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22.  * 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->Depth = 0;
  56.    rb->InternalFormat = GL_RGBA;
  57.    rb->Format = MESA_FORMAT_NONE;
  58. }
  59.  
  60.  
  61. /**
  62.  * Allocate a new gl_renderbuffer object.  This can be used for user-created
  63.  * renderbuffers or window-system renderbuffers.
  64.  */
  65. struct gl_renderbuffer *
  66. _mesa_new_renderbuffer(struct gl_context *ctx, GLuint name)
  67. {
  68.    struct gl_renderbuffer *rb = CALLOC_STRUCT(gl_renderbuffer);
  69.    if (rb) {
  70.       _mesa_init_renderbuffer(rb, name);
  71.    }
  72.    return rb;
  73. }
  74.  
  75.  
  76. /**
  77.  * Delete a gl_framebuffer.
  78.  * This is the default function for renderbuffer->Delete().
  79.  * Drivers which subclass gl_renderbuffer should probably implement their
  80.  * own delete function.  But the driver might also call this function to
  81.  * free the object in the end.
  82.  */
  83. void
  84. _mesa_delete_renderbuffer(struct gl_context *ctx, struct gl_renderbuffer *rb)
  85. {
  86.    _glthread_DESTROY_MUTEX(rb->Mutex);
  87.    free(rb);
  88. }
  89.  
  90.  
  91. /**
  92.  * Attach a renderbuffer to a framebuffer.
  93.  * \param bufferName  one of the BUFFER_x tokens
  94.  */
  95. void
  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.  */
  129. void
  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.  */
  146. void
  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.          GET_CURRENT_CONTEXT(ctx);
  164.          oldRb->Delete(ctx, oldRb);
  165.       }
  166.  
  167.       *ptr = NULL;
  168.    }
  169.    assert(!*ptr);
  170.  
  171.    if (rb) {
  172.       /* reference new renderbuffer */
  173.       _glthread_LOCK_MUTEX(rb->Mutex);
  174.       rb->RefCount++;
  175.       /*printf("RB INCR %p (%d) to %d\n", (void*) rb, rb->Name, rb->RefCount);*/
  176.       _glthread_UNLOCK_MUTEX(rb->Mutex);
  177.       *ptr = rb;
  178.    }
  179. }
  180.