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  * Default GetPointer routine.  Always return NULL to indicate that
  37  * direct buffer access is not supported.
  38  */
  39 static void *
  40 nop_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  */
  49 void
  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  */
  89 struct 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  */
 104 void
 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  */
 118 void
 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 (fb->Name) {
 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  */
 152 void
 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  */
 169 void
 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 }