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
  59
  60 /**
  61  * Allocate a new gl_renderbuffer object.  This can be used for user-created
  62  * renderbuffers or window-system renderbuffers.
  63  */
  64 struct gl_renderbuffer *
  65 _mesa_new_renderbuffer(struct gl_context *ctx, GLuint name)
  66 {
  67    struct gl_renderbuffer *rb = CALLOC_STRUCT(gl_renderbuffer);
  68    if (rb) {
  69       _mesa_init_renderbuffer(rb, name);
  70    }
  71    return rb;
  72 }
  73
  74
  75 /**
  76  * Delete a gl_framebuffer.
  77  * This is the default function for renderbuffer->Delete().
  78  * Drivers which subclass gl_renderbuffer should probably implement their
  79  * own delete function.  But the driver might also call this function to
  80  * free the object in the end.
  81  */
  82 void
  83 _mesa_delete_renderbuffer(struct gl_context *ctx, struct gl_renderbuffer *rb)
  84 {
  85    _glthread_DESTROY_MUTEX(rb->Mutex);
  86    free(rb);
  87 }
  88
  89
  90 /**
  91  * Attach a renderbuffer to a framebuffer.
  92  * \param bufferName  one of the BUFFER_x tokens
  93  */
  94 void
  95 _mesa_add_renderbuffer(struct gl_framebuffer *fb,
  96                        gl_buffer_index bufferName, struct gl_renderbuffer *rb)
  97 {
  98    assert(fb);
  99    assert(rb);
 100    assert(bufferName < BUFFER_COUNT);
 101
 102    /* There should be no previous renderbuffer on this attachment point,
 103     * with the exception of depth/stencil since the same renderbuffer may
 104     * be used for both.
 105     */
 106    assert(bufferName == BUFFER_DEPTH ||
 107           bufferName == BUFFER_STENCIL ||
 108           fb->Attachment[bufferName].Renderbuffer == NULL);
 109
 110    /* winsys vs. user-created buffer cross check */
 111    if (_mesa_is_user_fbo(fb)) {
 112       assert(rb->Name);
 113    }
 114    else {
 115       assert(!rb->Name);
 116    }
 117
 118    fb->Attachment[bufferName].Type = GL_RENDERBUFFER_EXT;
 119    fb->Attachment[bufferName].Complete = GL_TRUE;
 120    _mesa_reference_renderbuffer(&fb->Attachment[bufferName].Renderbuffer, rb);
 121 }
 122
 123
 124 /**
 125  * Remove the named renderbuffer from the given framebuffer.
 126  * \param bufferName  one of the BUFFER_x tokens
 127  */
 128 void
 129 _mesa_remove_renderbuffer(struct gl_framebuffer *fb,
 130                           gl_buffer_index bufferName)
 131 {
 132    assert(bufferName < BUFFER_COUNT);
 133    _mesa_reference_renderbuffer(&fb->Attachment[bufferName].Renderbuffer,
 134                                 NULL);
 135 }
 136
 137
 138 /**
 139  * Set *ptr to point to rb.  If *ptr points to another renderbuffer,
 140  * dereference that buffer first.  The new renderbuffer's refcount will
 141  * be incremented.  The old renderbuffer's refcount will be decremented.
 142  * This is normally only called from the _mesa_reference_renderbuffer() macro
 143  * when there's a real pointer change.
 144  */
 145 void
 146 _mesa_reference_renderbuffer_(struct gl_renderbuffer **ptr,
 147                               struct gl_renderbuffer *rb)
 148 {
 149    if (*ptr) {
 150       /* Unreference the old renderbuffer */
 151       GLboolean deleteFlag = GL_FALSE;
 152       struct gl_renderbuffer *oldRb = *ptr;
 153
 154       _glthread_LOCK_MUTEX(oldRb->Mutex);
 155       ASSERT(oldRb->RefCount > 0);
 156       oldRb->RefCount--;
 157       /*printf("RB DECR %p (%d) to %d\n", (void*) oldRb, oldRb->Name, oldRb->RefCount);*/
 158       deleteFlag = (oldRb->RefCount == 0);
 159       _glthread_UNLOCK_MUTEX(oldRb->Mutex);
 160
 161       if (deleteFlag) {
 162          GET_CURRENT_CONTEXT(ctx);
 163          oldRb->Delete(ctx, 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 }