Check for GL_NV_path_rendering extension

If resolving of glProgramPathFragmentInput fails, the nvpr renderer
should not report that it is supported, so that the shape item can
fallback to the geometry renderer.

Task-number: QTBUG-61913
Change-Id: I0795b1dedc330432884d5214ee2492c757055a54
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

1 files changed, 6 insertions, 2 deletions

diff --git a/src/imports/shapes/qquicknvprfunctions.cpp b/src/imports/shapes/qquicknvprfunctions.cpp
index 0b92d4b4c0..409a59be7f 100644
--- a/src/imports/shapes/qquicknvprfunctions.cpp
+++ b/src/imports/shapes/qquicknvprfunctions.cpp
@@ -87,6 +87,8 @@ QSurfaceFormat QQuickNvprFunctions::format()
     return fmt;
 }
 
+#define PROC(type, name) reinterpret_cast<type>(ctx->getProcAddress(#name))
+
 /*!
   \return true if GL_NV_path_rendering is supported with the current OpenGL
   context.
@@ -114,6 +116,10 @@ bool QQuickNvprFunctions::isSupported()
     if (!ctx->hasExtension(QByteArrayLiteral("GL_NV_path_rendering")))
         return false;
 
+    // Check that GL_NV_Path_rendering extension is at least API revision 1.3
+    if (!PROC(PFNGLPROGRAMPATHFRAGMENTINPUTGENNVPROC, glProgramPathFragmentInputGenNV))
+        return false;
+
     // Do not check for DSA as the string may not be exposed on ES
     // drivers, yet the functions we need are resolvable.
 #if 0
@@ -199,8 +205,6 @@ bool QQuickNvprFunctions::createFragmentOnlyPipeline(const char *fragmentShaderS
     return true;
 }
 
-#define PROC(type, name) reinterpret_cast<type>(ctx->getProcAddress(#name))
-
 bool QQuickNvprFunctionsPrivate::resolve()
 {
     QOpenGLContext *ctx = QOpenGLContext::currentContext();