vcl/opengl/framebuffer.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  */
   9
  10 #include <sal/log.hxx>
  11
  12 #include <opengl/framebuffer.hxx>
  13
  14 #include <vcl/opengl/OpenGLHelper.hxx>
  15
  16 OpenGLFramebuffer::OpenGLFramebuffer() :
  17     mnId( 0 ),
  18     mnWidth( 0 ),
  19     mnHeight( 0 ),
  20     mnAttachedTexture( 0 ),
  21     mpPrevFramebuffer( nullptr )
  22 {
  23     glGenFramebuffers( 1, &mnId );
  24     CHECK_GL_ERROR();
  25     VCL_GL_INFO( "Created framebuffer " << static_cast<int>(mnId) );
  26 }
  27
  28 OpenGLFramebuffer::~OpenGLFramebuffer()
  29 {
  30     glDeleteFramebuffers( 1, &mnId );
  31     VCL_GL_INFO( "Deleted framebuffer " << static_cast<int>(mnId) );
  32     CHECK_GL_ERROR();
  33 }
  34
  35 void OpenGLFramebuffer::Bind(GLenum eTarget)
  36 {
  37     VCL_GL_INFO( "Binding framebuffer " << static_cast<int>(mnId) );
  38     glBindFramebuffer(eTarget, mnId);
  39     CHECK_GL_ERROR();
  40 }
  41
  42 void OpenGLFramebuffer::Unbind(GLenum eTarget)
  43 {
  44     glBindFramebuffer(eTarget, 0);
  45     CHECK_GL_ERROR();
  46     VCL_GL_INFO( "Binding default framebuffer" );
  47 }
  48
  49 bool OpenGLFramebuffer::IsFree() const
  50 {
  51     return !mnAttachedTexture;
  52 }
  53
  54 bool OpenGLFramebuffer::IsAttached( GLuint nTexture ) const
  55 {
  56     return mnAttachedTexture == nTexture;
  57 }
  58
  59 bool OpenGLFramebuffer::IsAttached( const OpenGLTexture& rTexture ) const
  60 {
  61     return mnAttachedTexture == rTexture.Id();
  62 }
  63
  64 void OpenGLFramebuffer::AttachTexture( const OpenGLTexture& rTexture )
  65 {
  66     if( rTexture.Id() == mnAttachedTexture )
  67         return;
  68
  69     VCL_GL_INFO( "Attaching texture " << rTexture.Id() << " to framebuffer " << static_cast<int>(mnId) );
  70     mnAttachedTexture = rTexture.Id();
  71     mnWidth = rTexture.GetWidth();
  72     mnHeight = rTexture.GetHeight();
  73     glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mnAttachedTexture, 0);
  74     CHECK_GL_ERROR();
  75
  76     GLuint nStencil = rTexture.StencilId();
  77     if( nStencil )
  78     {
  79         VCL_GL_INFO( "Attaching stencil " << nStencil << " to framebuffer " << static_cast<int>(mnId) );
  80         glFramebufferRenderbuffer( GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT,
  81                                    GL_RENDERBUFFER, nStencil );
  82         CHECK_GL_ERROR();
  83     }
  84
  85     GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
  86     CHECK_GL_ERROR();
  87     if (status != GL_FRAMEBUFFER_COMPLETE)
  88     {
  89         SAL_WARN("vcl.opengl", "Framebuffer incomplete");
  90     }
  91 }
  92
  93 void OpenGLFramebuffer::DetachTexture()
  94 {
  95     if( mnAttachedTexture != 0 )
  96     {
  97         mnAttachedTexture = 0;
  98         glFramebufferTexture2D( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, 0, 0 );
  99         CHECK_GL_ERROR();
 100
 101         // FIXME: we could make this conditional on having a stencil ?
 102         glFramebufferRenderbuffer( GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT,
 103                                    GL_RENDERBUFFER, 0 );
 104         CHECK_GL_ERROR();
 105     }
 106 }
 107
 108 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */