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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.    GET_CURRENT_CONTEXT(ctx);
  42.  
  43.    mtx_init(&rb->Mutex, mtx_plain);
  44.  
  45.    rb->ClassID = 0;
  46.    rb->Name = name;
  47.    rb->RefCount = 0;
  48.    rb->Delete = _mesa_delete_renderbuffer;
  49.  
  50.    /* The rest of these should be set later by the caller of this function or
  51.     * the AllocStorage method:
  52.     */
  53.    rb->AllocStorage = NULL;
  54.  
  55.    rb->Width = 0;
  56.    rb->Height = 0;
  57.    rb->Depth = 0;
  58.  
  59.    /* In GL 3, the initial format is GL_RGBA according to Table 6.26
  60.     * on page 302 of the GL 3.3 spec.
  61.     *
  62.     * In GLES 3, the initial format is GL_RGBA4 according to Table 6.15
  63.     * on page 258 of the GLES 3.0.4 spec.
  64.     *
  65.     * If the context is current, set the initial format based on the
  66.     * specs. If the context is not current, we cannot determine the
  67.     * API, so default to GL_RGBA.
  68.     */
  69.    if (ctx && _mesa_is_gles3(ctx)) {
  70.       rb->InternalFormat = GL_RGBA4;
  71.    } else {
  72.       rb->InternalFormat = GL_RGBA;
  73.    }
  74.  
  75.    rb->Format = MESA_FORMAT_NONE;
  76. }
  77.  
  78.  
  79. /**
  80.  * Allocate a new gl_renderbuffer object.  This can be used for user-created
  81.  * renderbuffers or window-system renderbuffers.
  82.  */
  83. struct gl_renderbuffer *
  84. _mesa_new_renderbuffer(struct gl_context *ctx, GLuint name)
  85. {
  86.    struct gl_renderbuffer *rb = CALLOC_STRUCT(gl_renderbuffer);
  87.    if (rb) {
  88.       _mesa_init_renderbuffer(rb, name);
  89.    }
  90.    return rb;
  91. }
  92.  
  93.  
  94. /**
  95.  * Delete a gl_framebuffer.
  96.  * This is the default function for renderbuffer->Delete().
  97.  * Drivers which subclass gl_renderbuffer should probably implement their
  98.  * own delete function.  But the driver might also call this function to
  99.  * free the object in the end.
  100.  */
  101. void
  102. _mesa_delete_renderbuffer(struct gl_context *ctx, struct gl_renderbuffer *rb)
  103. {
  104.    mtx_destroy(&rb->Mutex);
  105.    free(rb->Label);
  106.    free(rb);
  107. }
  108.  
  109.  
  110. /**
  111.  * Attach a renderbuffer to a framebuffer.
  112.  * \param bufferName  one of the BUFFER_x tokens
  113.  */
  114. void
  115. _mesa_add_renderbuffer(struct gl_framebuffer *fb,
  116.                        gl_buffer_index bufferName, struct gl_renderbuffer *rb)
  117. {
  118.    assert(fb);
  119.    assert(rb);
  120.    assert(bufferName < BUFFER_COUNT);
  121.  
  122.    /* There should be no previous renderbuffer on this attachment point,
  123.     * with the exception of depth/stencil since the same renderbuffer may
  124.     * be used for both.
  125.     */
  126.    assert(bufferName == BUFFER_DEPTH ||
  127.           bufferName == BUFFER_STENCIL ||
  128.           fb->Attachment[bufferName].Renderbuffer == NULL);
  129.  
  130.    /* winsys vs. user-created buffer cross check */
  131.    if (_mesa_is_user_fbo(fb)) {
  132.       assert(rb->Name);
  133.    }
  134.    else {
  135.       assert(!rb->Name);
  136.    }
  137.  
  138.    fb->Attachment[bufferName].Type = GL_RENDERBUFFER_EXT;
  139.    fb->Attachment[bufferName].Complete = GL_TRUE;
  140.    _mesa_reference_renderbuffer(&fb->Attachment[bufferName].Renderbuffer, rb);
  141. }
  142.  
  143.  
  144. /**
  145.  * Remove the named renderbuffer from the given framebuffer.
  146.  * \param bufferName  one of the BUFFER_x tokens
  147.  */
  148. void
  149. _mesa_remove_renderbuffer(struct gl_framebuffer *fb,
  150.                           gl_buffer_index bufferName)
  151. {
  152.    assert(bufferName < BUFFER_COUNT);
  153.    _mesa_reference_renderbuffer(&fb->Attachment[bufferName].Renderbuffer,
  154.                                 NULL);
  155. }
  156.  
  157.  
  158. /**
  159.  * Set *ptr to point to rb.  If *ptr points to another renderbuffer,
  160.  * dereference that buffer first.  The new renderbuffer's refcount will
  161.  * be incremented.  The old renderbuffer's refcount will be decremented.
  162.  * This is normally only called from the _mesa_reference_renderbuffer() macro
  163.  * when there's a real pointer change.
  164.  */
  165. void
  166. _mesa_reference_renderbuffer_(struct gl_renderbuffer **ptr,
  167.                               struct gl_renderbuffer *rb)
  168. {
  169.    if (*ptr) {
  170.       /* Unreference the old renderbuffer */
  171.       GLboolean deleteFlag = GL_FALSE;
  172.       struct gl_renderbuffer *oldRb = *ptr;
  173.  
  174.       mtx_lock(&oldRb->Mutex);
  175.       assert(oldRb->RefCount > 0);
  176.       oldRb->RefCount--;
  177.       /*printf("RB DECR %p (%d) to %d\n", (void*) oldRb, oldRb->Name, oldRb->RefCount);*/
  178.       deleteFlag = (oldRb->RefCount == 0);
  179.       mtx_unlock(&oldRb->Mutex);
  180.  
  181.       if (deleteFlag) {
  182.          GET_CURRENT_CONTEXT(ctx);
  183.          oldRb->Delete(ctx, oldRb);
  184.       }
  185.  
  186.       *ptr = NULL;
  187.    }
  188.    assert(!*ptr);
  189.  
  190.    if (rb) {
  191.       /* reference new renderbuffer */
  192.       mtx_lock(&rb->Mutex);
  193.       rb->RefCount++;
  194.       /*printf("RB INCR %p (%d) to %d\n", (void*) rb, rb->Name, rb->RefCount);*/
  195.       mtx_unlock(&rb->Mutex);
  196.       *ptr = rb;
  197.    }
  198. }
  199.