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      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 }
    179