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From dd2a427857612798071d3f8c23286322654669d6 Mon Sep 17 00:00:00 2001
From: Valery Volgutov <valery.volgutov@lge.com>
Date: Tue, 21 May 2013 12:02:19 -0700
Subject: [PATCH] Fix FBO restoring in QOpenGLTextureGlyphCache
QOpenGLTextureGlyphCache::restoreTextureData restores FBO which
was binded before restoreTextureData call. More specifically,
it restores QOpenGLContextPrivate's current_fbo member. This works
if FBO was binded by QOpenGLFramebufferObject but not if FBO was
binded using glBindFramebufferObject and rendering done via
QOpenGLPaintDevice.
This patch fixes it by querying current FBO using
GL_FRAMEBUFFER_BINDING query and restoring it.
Upstream-Status: Backport
https://codereview.qt-project.org/#change,56608
---
src/gui/opengl/qopengltextureglyphcache.cpp | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/src/gui/opengl/qopengltextureglyphcache.cpp b/src/gui/opengl/qopengltextureglyphcache.cpp
index 4e20f6a..3e66bad 100644
--- a/src/gui/opengl/qopengltextureglyphcache.cpp
+++ b/src/gui/opengl/qopengltextureglyphcache.cpp
@@ -147,6 +147,9 @@ void QOpenGLTextureGlyphCache::resizeTextureData(int width, int height)
return;
}
+ GLuint saveFbo;
+ glGetIntegerv(GL_FRAMEBUFFER_BINDING, &saveFbo);
+
int oldWidth = m_textureResource->m_width;
int oldHeight = m_textureResource->m_height;
@@ -265,7 +268,7 @@ void QOpenGLTextureGlyphCache::resizeTextureData(int width, int height)
glDeleteTextures(1, &tmp_texture);
glDeleteTextures(1, &oldTexture);
- funcs.glBindFramebuffer(GL_FRAMEBUFFER, ctx->d_func()->current_fbo);
+ funcs.glBindFramebuffer(GL_FRAMEBUFFER, saveFbo);
if (pex != 0) {
glViewport(0, 0, pex->width, pex->height);
--
1.7.9.5
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