Commit 1d362d38 authored by Vlad Zahorodnii's avatar Vlad Zahorodnii

[libkwineffects] Restore GL_DRAW_FRAMEBUFFER binding in GLTexture::clear

If an effect renders a window into an offscreen texture, it's very important
that the window ends up in the offscreen render target rather than the default
framebuffer object. However, that might be not the case if the OpenGL
decoration renderer needs to create a texture atlas since the renderer calls
GLTexture::clear() method, which might clobber the current GL_DRAW_FRAMEBUFFER

Reviewers: #kwin, davidedmundson

Reviewed By: #kwin, davidedmundson

Subscribers: kwin

Tags: #kwin

Differential Revision:
parent c85a2227
......@@ -514,11 +514,15 @@ void GLTexture::clear()
if (GLTexturePrivate::s_fbo) {
// Clear the texture
glBindFramebuffer(GL_FRAMEBUFFER, GLTexturePrivate::s_fbo);
GLuint previousFramebuffer = 0;
glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, reinterpret_cast<GLint *>(&previousFramebuffer));
if (GLTexturePrivate::s_fbo != previousFramebuffer)
glBindFramebuffer(GL_FRAMEBUFFER, GLTexturePrivate::s_fbo);
glClearColor(0, 0, 0, 0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, d->m_texture, 0);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
if (GLTexturePrivate::s_fbo != previousFramebuffer)
glBindFramebuffer(GL_FRAMEBUFFER, previousFramebuffer);
} else {
if (const int size = width()*height()) {
uint32_t *buffer = new uint32_t[size];
......@@ -108,7 +108,6 @@ public:
/** @short
* Make the texture fully transparent
* Warning: this clobbers the current framebuffer binding except on fglrx
void clear();
bool isDirty() const;
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