100 lines
2.7 KiB
C++
100 lines
2.7 KiB
C++
/***
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Olive - Non-Linear Video Editor
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Copyright (C) 2019 Olive Team
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "alphaover.h"
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#include "node/processor/renderer/renderer.h"
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#include "render/gl/functions.h"
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#include "render/rendertexture.h"
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#include "render/gl/shadergenerators.h"
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AlphaOverBlend::AlphaOverBlend()
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{
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}
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QString AlphaOverBlend::Name()
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{
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return tr("Alpha Over");
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}
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QString AlphaOverBlend::id()
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{
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return "org.olivevideoeditor.Olive.alphaoverblend";
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}
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QString AlphaOverBlend::Description()
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{
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return tr("A blending node that composites one texture over another using its alpha channel.");
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}
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void AlphaOverBlend::Release()
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{
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}
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QVariant AlphaOverBlend::Value(NodeOutput *param, const rational &time)
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{
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// Find the current Renderer instance
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RenderInstance* renderer = RendererProcessor::CurrentInstance();
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// If nothing is available, don't return a texture
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if (renderer == nullptr) {
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return 0;
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}
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// The only parameter should be texture output, but for future proofing we put this here
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if (param == texture_output()) {
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RenderTexturePtr base = base_input()->get_value(time).value<RenderTexturePtr>();
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RenderTexturePtr blend = blend_input()->get_value(time).value<RenderTexturePtr>();
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if (base == nullptr && blend == nullptr) {
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return 0;
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} else if (base == nullptr) {
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return QVariant::fromValue(blend);
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} else if (blend == nullptr) {
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return QVariant::fromValue(base);
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}
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// Attach framebuffer to the backbuffer of base
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renderer->buffer()->Attach(base);
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renderer->buffer()->Bind();
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// Bind blend
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blend->Bind();
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// Set compositing strategy to alpha over
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renderer->context()->functions()->glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
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// Draw blend on base
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olive::gl::Blit(renderer->default_pipeline());
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// Release all
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blend->Release();
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renderer->buffer()->Release();
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renderer->buffer()->Detach();
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// Return base texture which now has blend composited on top
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// NOTE: Blend texture will be implicitly deleted here (if it's not used anywhere else)
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return QVariant::fromValue(base);
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}
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return 0;
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}
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