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[libkwineffects] Set original backend framebuffer for render targets

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Summary:
KWin only renders into the default framebuffer, which is for example an EGL
surface.

To prepare a post-processing step with a different framebuffer allow the
framebuffer to be changable. For that KWin's current framebuffer must be
communicated to the GLRenderTarget class, which otherwise does not set it back
to KWin's current one when a render target is disabled again.

Test Plan: Compiles, with other patches for Gl based screen rotation

Reviewers: #kwin

Subscribers: fredrik, zzag, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D25904
This commit is contained in:
Roman Gilg 2020-01-02 14:55:03 +00:00 committed by David Edmundson
parent dfea5798f1
commit 9c398de683
2 changed files with 15 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
libkwineffects/kwinglutils.cpp
View file

@ -1061,6 +1061,7 @@ QSize GLRenderTarget::s_virtualScreenSize;
QRect GLRenderTarget::s_virtualScreenGeometry;
qreal GLRenderTarget::s_virtualScreenScale = 1.0;
GLint GLRenderTarget::s_virtualScreenViewport[4];
GLuint GLRenderTarget::s_kwinFramebuffer = 0;
void GLRenderTarget::initStatic()
{
@ -1185,7 +1186,7 @@ bool GLRenderTarget::disable()
return false;
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glBindFramebuffer(GL_FRAMEBUFFER, s_kwinFramebuffer);
mTexture.setDirty();
return true;
@ -1256,7 +1257,7 @@ void GLRenderTarget::initFBO()
#if DEBUG_GLRENDERTARGET
if ((err = glGetError()) != GL_NO_ERROR) {
qCCritical(LIBKWINGLUTILS) << "glFramebufferTexture2D failed: " << formatGLError(err);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glBindFramebuffer(GL_FRAMEBUFFER, s_kwinFramebuffer);
glDeleteFramebuffers(1, &mFramebuffer);
return;
}
@ -1264,7 +1265,7 @@ void GLRenderTarget::initFBO()
const GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glBindFramebuffer(GL_FRAMEBUFFER, s_kwinFramebuffer);
if (status != GL_FRAMEBUFFER_COMPLETE) {
// We have an incomplete framebuffer, consider it invalid
@ -1291,7 +1292,7 @@ void GLRenderTarget::blitFromFramebuffer(const QRect &source, const QRect &desti
GLRenderTarget::pushRenderTarget(this);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, mFramebuffer);
glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
glBindFramebuffer(GL_READ_FRAMEBUFFER, s_kwinFramebuffer);
const QRect s = source.isNull() ? s_virtualScreenGeometry : source;
const QRect d = destination.isNull() ? QRect(0, 0, mTexture.width(), mTexture.height()) : destination;

10
libkwineffects/kwinglutils.h
View file

@ -546,6 +546,15 @@ public:
return s_virtualScreenScale;
}
/**
* The framebuffer of KWin's OpenGL window or other object currently being rendered to
*
* @since 5.18
*/
static void setKWinFramebuffer(GLuint fb) {
s_kwinFramebuffer = fb;
}
protected:
void initFBO();
@ -561,6 +570,7 @@ private:
static QRect s_virtualScreenGeometry;
static qreal s_virtualScreenScale;
static GLint s_virtualScreenViewport[4];
static GLuint s_kwinFramebuffer;
GLTexture mTexture;
bool mValid;