split fbo and texture into two separate objects

app/render/renderframebuffer.cpp

@@ -0,0 +1,127 @@
+/***
+
+  Olive - Non-Linear Video Editor
+  Copyright (C) 2019 Olive Team
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+***/
+
+#include "renderframebuffer.h"
+
+#include <QDebug>
+#include <QOpenGLExtraFunctions>
+
+RenderFramebuffer::RenderFramebuffer() :
+  context_(nullptr),
+  buffer_(0),
+  texture_(nullptr)
+{
+
+}
+
+RenderFramebuffer::~RenderFramebuffer()
+{
+  Destroy();
+}
+
+void RenderFramebuffer::Create(QOpenGLContext *ctx)
+{
+  if (ctx == nullptr) {
+    qWarning() << tr("RenderTexture::Create was passed an invalid context");
+    return;
+  }
+
+  // Free any previous framebuffer
+  Destroy();
+
+  context_ = ctx;
+
+  // Create framebuffer object
+  context_->functions()->glGenFramebuffers(1, &buffer_);
+}
+
+void RenderFramebuffer::Destroy()
+{
+  if (context_ != nullptr) {
+    context_->functions()->glDeleteFramebuffers(1, &buffer_);
+
+    buffer_ = 0;
+
+    context_ = nullptr;
+  }
+}
+
+bool RenderFramebuffer::IsCreated() const
+{
+  return (buffer_ > 0);
+}
+
+void RenderFramebuffer::Bind()
+{
+  if (context_ == nullptr) {
+    return;
+  }
+  context_->functions()->glBindFramebuffer(GL_DRAW_FRAMEBUFFER, buffer_);
+}
+
+void RenderFramebuffer::Release()
+{
+  if (context_ == nullptr) {
+    return;
+  }
+  context_->functions()->glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
+}
+
+void RenderFramebuffer::Attach(RenderTexturePtr texture)
+{
+  Detach();
+
+  texture_ = texture;
+
+  QOpenGLFunctions* f = context_->functions();
+
+  // bind framebuffer for attaching
+  f->glBindFramebuffer(GL_DRAW_FRAMEBUFFER, buffer_);
+
+  // bind texture
+  f->glBindTexture(GL_TEXTURE_2D, texture_->texture());
+
+  context_->extraFunctions()->glFramebufferTexture2D(
+        GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture_->texture(), 0
+        );
+
+  // release texture
+  f->glBindTexture(GL_TEXTURE_2D, 0);
+
+  // release framebuffer
+  f->glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
+}
+
+void RenderFramebuffer::Detach()
+{
+  QOpenGLFunctions* f = context_->functions();
+
+  // bind framebuffer for attaching
+  f->glBindFramebuffer(GL_DRAW_FRAMEBUFFER, buffer_);
+
+  context_->extraFunctions()->glFramebufferTexture2D(
+        GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, 0, 0
+        );
+
+  // release framebuffer
+  f->glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
+
+  texture_ = nullptr;
+}