void LanczosFilter::init()
{
if (m_inited)
return;
m_inited = true;
const bool force = (qstrcmp(qgetenv("KWIN_FORCE_LANCZOS"), "1") == 0);
if (force) {
kWarning(1212) << "Lanczos Filter forced on by environment variable";
}
if (!force && options->glSmoothScale() != 2)
return; // disabled by config
// The lanczos filter is reported to be broken with the Intel driver and Mesa 7.10
GLPlatform *gl = GLPlatform::instance();
if (!force && gl->driver() == Driver_Intel && gl->mesaVersion() >= kVersionNumber(7, 10) && gl->chipClass() < SandyBridge)
return;
// With fglrx the ARB Shader crashes KWin (see Bug #270818 and #286795) and GLSL Shaders are not functional
if (!force && gl->driver() == Driver_Catalyst) {
return;
}
m_shader = new LanczosShader(this);
if (!m_shader->init()) {
delete m_shader;
m_shader = 0;
}
}
