diff options
| -rw-r--r-- | subsurface-desktop-main.cpp | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/subsurface-desktop-main.cpp b/subsurface-desktop-main.cpp index 029f8569e..0c7f92a4e 100644 --- a/subsurface-desktop-main.cpp +++ b/subsurface-desktop-main.cpp @@ -21,9 +21,14 @@ #include <QStringList> #include <QApplication> #include <QLoggingCategory> +#include <QOpenGLContext> +#include <QOffscreenSurface> +#include <QOpenGLFunctions> +#include <QQuickWindow> #include <git2.h> static bool filesOnCommandLine = false; +static void validateGL(); int main(int argc, char **argv) { @@ -46,6 +51,8 @@ int main(int argc, char **argv) subsurface_console_init(dedicated_console, false); } + validateGL(); + const char *default_directory = system_default_directory(); const char *default_filename = system_default_filename(); subsurface_mkdir(default_directory); @@ -129,3 +136,46 @@ bool haveFilesOnCommandLine() { return filesOnCommandLine; } + +void validateGL() +{ + GLint verMajor, verMinor; + const char *glError = NULL; + QOpenGLContext ctx; + QOffscreenSurface surface; + QOpenGLFunctions *func; + + surface.setFormat(ctx.format()); + surface.create(); + if (!ctx.create()) { + glError = "Cannot create OpenGL context"; + goto exit; + } + ctx.makeCurrent(&surface); + func = ctx.functions(); + if (!func) { + glError = "Cannot obtain QOpenGLFunctions"; + goto exit; + } + func->glGetIntegerv(GL_MAJOR_VERSION, &verMajor); + func->glGetIntegerv(GL_MINOR_VERSION, &verMinor); + if (verMajor * 10 + verMinor < 21) // set 2.1 as the minimal version + glError = "OpenGL 2.1 or later is required"; + +exit: + ctx.makeCurrent(NULL); + surface.destroy(); + if (glError) { +#if QT_VERSION < QT_VERSION_CHECK(5, 8, 0) + fprintf(stderr, "ERROR: %s.\n" + "Cannot automatically fallback to a software renderer!\n" + "Set the environment variable 'QT_QUICK_BACKEND' with the value of 'software'\n" + "before running Subsurface!\n", + glError); + exit(0); +#else + fprintf(stderr, "WARNING: %s. Using a software renderer!\n", glError); + QQuickWindow::setSceneGraphBackend(QSGRendererInterface::Software); +#endif + } +} |