1 files changed, 108 insertions, 0 deletions
diff --git a/vcl/opengl/framebuffer.cxx b/vcl/opengl/framebuffer.cxx
new file mode 100644
index 000000000..db957d1a6
--- /dev/null
+++ b/vcl/opengl/framebuffer.cxx
@@ -0,0 +1,108 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <sal/log.hxx>
+
+#include <opengl/framebuffer.hxx>
+
+#include <vcl/opengl/OpenGLHelper.hxx>
+
+OpenGLFramebuffer::OpenGLFramebuffer() :
+    mnId( 0 ),
+    mnWidth( 0 ),
+    mnHeight( 0 ),
+    mnAttachedTexture( 0 ),
+    mpPrevFramebuffer( nullptr )
+{
+    glGenFramebuffers( 1, &mnId );
+    CHECK_GL_ERROR();
+    VCL_GL_INFO( "Created framebuffer " << static_cast<int>(mnId) );
+}
+
+OpenGLFramebuffer::~OpenGLFramebuffer()
+{
+    glDeleteFramebuffers( 1, &mnId );
+    VCL_GL_INFO( "Deleted framebuffer " << static_cast<int>(mnId) );
+    CHECK_GL_ERROR();
+}
+
+void OpenGLFramebuffer::Bind(GLenum eTarget)
+{
+    VCL_GL_INFO( "Binding framebuffer " << static_cast<int>(mnId) );
+    glBindFramebuffer(eTarget, mnId);
+    CHECK_GL_ERROR();
+}
+
+void OpenGLFramebuffer::Unbind(GLenum eTarget)
+{
+    glBindFramebuffer(eTarget, 0);
+    CHECK_GL_ERROR();
+    VCL_GL_INFO( "Binding default framebuffer" );
+}
+
+bool OpenGLFramebuffer::IsFree() const
+{
+    return !mnAttachedTexture;
+}
+
+bool OpenGLFramebuffer::IsAttached( GLuint nTexture ) const
+{
+    return mnAttachedTexture == nTexture;
+}
+
+bool OpenGLFramebuffer::IsAttached( const OpenGLTexture& rTexture ) const
+{
+    return mnAttachedTexture == rTexture.Id();
+}
+
+void OpenGLFramebuffer::AttachTexture( const OpenGLTexture& rTexture )
+{
+    if( rTexture.Id() == mnAttachedTexture )
+        return;
+
+    VCL_GL_INFO( "Attaching texture " << rTexture.Id() << " to framebuffer " << static_cast<int>(mnId) );
+    mnAttachedTexture = rTexture.Id();
+    mnWidth = rTexture.GetWidth();
+    mnHeight = rTexture.GetHeight();
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mnAttachedTexture, 0);
+    CHECK_GL_ERROR();
+
+    GLuint nStencil = rTexture.StencilId();
+    if( nStencil )
+    {
+        VCL_GL_INFO( "Attaching stencil " << nStencil << " to framebuffer " << static_cast<int>(mnId) );
+        glFramebufferRenderbuffer( GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT,
+                                   GL_RENDERBUFFER, nStencil );
+        CHECK_GL_ERROR();
+    }
+
+    GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
+    CHECK_GL_ERROR();
+    if (status != GL_FRAMEBUFFER_COMPLETE)
+    {
+        SAL_WARN("vcl.opengl", "Framebuffer incomplete");
+    }
+}
+
+void OpenGLFramebuffer::DetachTexture()
+{
+    if( mnAttachedTexture != 0 )
+    {
+        mnAttachedTexture = 0;
+        glFramebufferTexture2D( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, 0, 0 );
+        CHECK_GL_ERROR();
+
+        // FIXME: we could make this conditional on having a stencil ?
+        glFramebufferRenderbuffer( GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT,
+                                   GL_RENDERBUFFER, 0 );
+        CHECK_GL_ERROR();
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */