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-rw-r--r--src/opengl/qopenglpaintengine.cpp8
1 files changed, 8 insertions, 0 deletions
diff --git a/src/opengl/qopenglpaintengine.cpp b/src/opengl/qopenglpaintengine.cpp
index 8606a2e7ef..c385b4c62b 100644
--- a/src/opengl/qopenglpaintengine.cpp
+++ b/src/opengl/qopenglpaintengine.cpp
@@ -1124,6 +1124,10 @@ void QOpenGL2PaintEngineExPrivate::fillStencilWithVertexArray(const float *data,
funcs.glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); // Disable color writes
useSimpleShader();
+#ifndef QT_NO_DEBUG
+ if (ctx->format().stencilBufferSize() <= 0)
+ qWarning("OpenGL paint engine: attempted to use stencil test without requesting a stencil buffer.");
+#endif
funcs.glEnable(GL_STENCIL_TEST); // For some reason, this has to happen _after_ the simple shader is use()'d
if (mode == WindingFillMode) {
@@ -2346,6 +2350,10 @@ void QOpenGL2PaintEngineExPrivate::updateClipScissorTest()
{
Q_Q(QOpenGL2PaintEngineEx);
if (q->state()->clipTestEnabled) {
+#ifndef QT_NO_DEBUG
+ if (ctx->format().stencilBufferSize() <= 0)
+ qWarning("OpenGL paint engine: attempted to use stencil test for clipping without requesting a stencil buffer.");
+#endif
funcs.glEnable(GL_STENCIL_TEST);
funcs.glStencilFunc(GL_LEQUAL, q->state()->currentClip, ~GL_STENCIL_HIGH_BIT);
} else {