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#include <QGL>
#include <QOffscreenSurface>
#include <QOpenGLContext>
#include <QSurface>
#include <QSurfaceFormat>
#include <stdio.h>
#include <string>
QGLWidget *global_share_widget = nullptr;
using namespace std;
QSurface *create_surface()
{
QSurfaceFormat fmt;
fmt.setDepthBufferSize(0);
fmt.setStencilBufferSize(0);
fmt.setProfile(QSurfaceFormat::CoreProfile);
fmt.setMajorVersion(4);
fmt.setMinorVersion(5);
fmt.setSwapInterval(0);
QOffscreenSurface *surface = new QOffscreenSurface;
surface->setFormat(fmt);
surface->create();
if (!surface->isValid()) {
fprintf(stderr, "ERROR: surface not valid!\n");
abort();
}
return surface;
}
QSurface *create_surface(const QSurfaceFormat &format)
{
QOffscreenSurface *surface = new QOffscreenSurface;
surface->setFormat(format);
surface->create();
if (!surface->isValid()) {
fprintf(stderr, "ERROR: surface not valid!\n");
abort();
}
return surface;
}
QSurface *create_surface_with_same_format(const QSurface *surface)
{
return create_surface(surface->format());
}
QOpenGLContext *create_context(const QSurface *surface)
{
QOpenGLContext *context = new QOpenGLContext;
context->setShareContext(global_share_widget->context()->contextHandle());
// Qt has a bug (QTBUG-76299) where, when using EGL, the surface ignores
// the requested OpenGL context version and just becomes 2.0. Mesa honors
// this and gives us a 3.0 compatibility context, but then has a bug related
// to its shader cache (Mesa bug #110872) that causes spurious linker failures
// when we need to re-link a Movit shader in the same context. However,
// the surface itself doesn't use the OpenGL version in its format for anything,
// so we can just override it and get a proper context.
QSurfaceFormat fmt = surface->format();
fmt.setProfile(QSurfaceFormat::CoreProfile);
fmt.setMajorVersion(4);
fmt.setMinorVersion(5);
context->setFormat(fmt);
context->create();
return context;
}
bool make_current(QOpenGLContext *context, QSurface *surface)
{
return context->makeCurrent(surface);
}
void delete_context(QOpenGLContext *context)
{
delete context;
}
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