diff options
| -rw-r--r-- | src/opengl/qwindowsurface_gl.cpp | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/opengl/qwindowsurface_gl.cpp b/src/opengl/qwindowsurface_gl.cpp index b86fb78..d602000 100644 --- a/src/opengl/qwindowsurface_gl.cpp +++ b/src/opengl/qwindowsurface_gl.cpp @@ -426,6 +426,20 @@ static void drawTexture(const QRectF &rect, GLuint tex_id, const QSize &texSize, void QGLWindowSurface::beginPaint(const QRegion &) { + if (! context()) + return; + + int clearFlags = 0; + + if (context()->d_func()->workaround_needsFullClearOnEveryFrame) + clearFlags = GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT; + else if (context()->format().alpha()) + clearFlags = GL_COLOR_BUFFER_BIT; + + if (clearFlags) { + glClearColor(0.0, 0.0, 0.0, 0.0); + glClear(clearFlags); + } } void QGLWindowSurface::endPaint(const QRegion &rgn) |