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scenes/opengl: Paint background with alpha 0

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In conjunction with a buffer format with alpha channel this allows
to have KWin's backdrop transparent to see through to a display
layer below.

Signed-off-by: Eike Hein <eike.hein@mbition.io>
This commit is contained in:
Kai Uwe Broulik 2022-03-24 14:55:14 +01:00 committed by Kai Uwe Broulik
parent cb47df4fc4
commit 3733abab2c
1 changed files with 2 additions and 2 deletions
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4
src/scenes/opengl/scene_opengl.cpp
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@ -131,7 +131,7 @@ QMatrix4x4 SceneOpenGL::transformation(int mask, const ScreenPaintData &data) co
void SceneOpenGL::paintBackground(const QRegion &region)
{
if (region == infiniteRegion()) {
glClearColor(0, 0, 0, 1);
glClearColor(0, 0, 0, 0);
glClear(GL_COLOR_BUFFER_BIT);
} else if (!region.isEmpty()) {
QVector<float> verts;
@ -294,7 +294,7 @@ void SceneOpenGL::doPaintBackground(const QVector< float >& vertices)
{
GLVertexBuffer *vbo = GLVertexBuffer::streamingBuffer();
vbo->reset();
vbo->setUseColor(true);
vbo->setColor(QColor(0, 0, 0, 0));
vbo->setData(vertices.count() / 2, 2, vertices.data(), nullptr);
ShaderBinder binder(ShaderTrait::UniformColor);