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/*
* Mesa 3-D graphics library
* Version: 6.5
*
* Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "glheader.h"
#include "imports.h"
#include "context.h"
#include "fbobject.h"
#include "formats.h"
#include "mtypes.h"
#include "renderbuffer.h"
/**
* Default GetPointer routine. Always return NULL to indicate that
* direct buffer access is not supported.
*/
static void *
nop_get_pointer(struct gl_context *ctx, struct gl_renderbuffer *rb, GLint x, GLint y)
{
return NULL;
}
/**
* Initialize the fields of a gl_renderbuffer to default values.
*/
void
_mesa_init_renderbuffer(struct gl_renderbuffer *rb, GLuint name)
{
_glthread_INIT_MUTEX(rb->Mutex);
rb->ClassID = 0;
rb->Name = name;
rb->RefCount = 0;
rb->Delete = _mesa_delete_renderbuffer;
/* The rest of these should be set later by the caller of this function or
* the AllocStorage method:
*/
rb->AllocStorage = NULL;
rb->Width = 0;
rb->Height = 0;
rb->InternalFormat = GL_RGBA;
rb->Format = MESA_FORMAT_NONE;
rb->DataType = GL_NONE;
rb->Data = NULL;
/* Point back to ourself so that we don't have to check for Wrapped==NULL
* all over the drivers.
*/
rb->Wrapped = rb;
rb->GetPointer = nop_get_pointer;
rb->GetRow = NULL;
rb->GetValues = NULL;
rb->PutRow = NULL;
rb->PutValues = NULL;
}
/**
* Allocate a new gl_renderbuffer object. This can be used for user-created
* renderbuffers or window-system renderbuffers.
*/
struct gl_renderbuffer *
_mesa_new_renderbuffer(struct gl_context *ctx, GLuint name)
{
struct gl_renderbuffer *rb = CALLOC_STRUCT(gl_renderbuffer);
if (rb) {
_mesa_init_renderbuffer(rb, name);
}
return rb;
}
/**
* Delete a gl_framebuffer.
* This is the default function for renderbuffer->Delete().
*/
void
_mesa_delete_renderbuffer(struct gl_renderbuffer *rb)
{
if (rb->Data) {
free(rb->Data);
}
free(rb);
}
/**
* Attach a renderbuffer to a framebuffer.
* \param bufferName one of the BUFFER_x tokens
*/
void
_mesa_add_renderbuffer(struct gl_framebuffer *fb,
gl_buffer_index bufferName, struct gl_renderbuffer *rb)
{
assert(fb);
assert(rb);
assert(bufferName < BUFFER_COUNT);
/* There should be no previous renderbuffer on this attachment point,
* with the exception of depth/stencil since the same renderbuffer may
* be used for both.
*/
assert(bufferName == BUFFER_DEPTH ||
bufferName == BUFFER_STENCIL ||
fb->Attachment[bufferName].Renderbuffer == NULL);
/* winsys vs. user-created buffer cross check */
if (fb->Name) {
assert(rb->Name);
}
else {
assert(!rb->Name);
}
fb->Attachment[bufferName].Type = GL_RENDERBUFFER_EXT;
fb->Attachment[bufferName].Complete = GL_TRUE;
_mesa_reference_renderbuffer(&fb->Attachment[bufferName].Renderbuffer, rb);
}
/**
* Remove the named renderbuffer from the given framebuffer.
* \param bufferName one of the BUFFER_x tokens
*/
void
_mesa_remove_renderbuffer(struct gl_framebuffer *fb,
gl_buffer_index bufferName)
{
assert(bufferName < BUFFER_COUNT);
_mesa_reference_renderbuffer(&fb->Attachment[bufferName].Renderbuffer,
NULL);
}
/**
* Set *ptr to point to rb. If *ptr points to another renderbuffer,
* dereference that buffer first. The new renderbuffer's refcount will
* be incremented. The old renderbuffer's refcount will be decremented.
* This is normally only called from the _mesa_reference_renderbuffer() macro
* when there's a real pointer change.
*/
void
_mesa_reference_renderbuffer_(struct gl_renderbuffer **ptr,
struct gl_renderbuffer *rb)
{
if (*ptr) {
/* Unreference the old renderbuffer */
GLboolean deleteFlag = GL_FALSE;
struct gl_renderbuffer *oldRb = *ptr;
_glthread_LOCK_MUTEX(oldRb->Mutex);
ASSERT(oldRb->RefCount > 0);
oldRb->RefCount--;
/*printf("RB DECR %p (%d) to %d\n", (void*) oldRb, oldRb->Name, oldRb->RefCount);*/
deleteFlag = (oldRb->RefCount == 0);
_glthread_UNLOCK_MUTEX(oldRb->Mutex);
if (deleteFlag) {
oldRb->Delete(oldRb);
}
*ptr = NULL;
}
assert(!*ptr);
if (rb) {
/* reference new renderbuffer */
_glthread_LOCK_MUTEX(rb->Mutex);
rb->RefCount++;
/*printf("RB INCR %p (%d) to %d\n", (void*) rb, rb->Name, rb->RefCount);*/
_glthread_UNLOCK_MUTEX(rb->Mutex);
*ptr = rb;
}
}
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