92 lines
2.5 KiB
C++
92 lines
2.5 KiB
C++
/***
|
|
|
|
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 "alphaover.h"
|
|
|
|
#include "node/processor/renderer/renderer.h"
|
|
#include "render/gl/functions.h"
|
|
#include "render/rendertexture.h"
|
|
#include "render/gl/shadergenerators.h"
|
|
|
|
AlphaOverBlend::AlphaOverBlend()
|
|
{
|
|
|
|
}
|
|
|
|
QString AlphaOverBlend::Name()
|
|
{
|
|
return tr("Alpha Over");
|
|
}
|
|
|
|
QString AlphaOverBlend::id()
|
|
{
|
|
return "org.olivevideoeditor.Olive.alphaoverblend";
|
|
}
|
|
|
|
QString AlphaOverBlend::Description()
|
|
{
|
|
return tr("A blending node that composites one texture over another using its alpha channel.");
|
|
}
|
|
|
|
void AlphaOverBlend::Release()
|
|
{
|
|
}
|
|
|
|
QVariant AlphaOverBlend::Value(NodeOutput *param, const rational &time)
|
|
{
|
|
// Find the current Renderer instance
|
|
RenderInstance* renderer = RendererProcessor::CurrentInstance();
|
|
|
|
// If nothing is available, don't return a texture
|
|
if (renderer == nullptr) {
|
|
return 0;
|
|
}
|
|
|
|
// The only parameter should be texture output, but for future proofing we put this here
|
|
if (param == texture_output()) {
|
|
RenderTexturePtr base = base_input()->get_value(time).value<RenderTexturePtr>();
|
|
RenderTexturePtr blend = blend_input()->get_value(time).value<RenderTexturePtr>();
|
|
|
|
// Set compositing strategy to alpha over
|
|
renderer->context()->functions()->glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
|
|
|
|
// Attach framebuffer to the backbuffer of base
|
|
renderer->buffer()->Attach(base);
|
|
renderer->buffer()->Bind();
|
|
|
|
// Bind blend
|
|
blend->Bind();
|
|
|
|
// Draw blend on base
|
|
olive::gl::Blit(renderer->default_pipeline());
|
|
|
|
// Release all
|
|
blend->Release();
|
|
renderer->buffer()->Detach();
|
|
renderer->buffer()->Release();
|
|
|
|
// Return base texture which now has blend composited on top
|
|
// NOTE: Blend texture will be implicitly deleted here (if it's not used anywhere else)
|
|
return QVariant::fromValue(base);
|
|
}
|
|
|
|
return 0;
|
|
}
|