rhi: Add the basic infrastructure for geometry shader support

.. but this will only be supported on Vulkan, OpenGL 3.2+, and Open GL
ES 3.2+ for the time being.

The situation is:

- Vulkan is working.  qsb accepts .geom files already, and QShader has
  existing geometry shader support.

- OpenGL 3.2 and OpenGL ES 3.2 are working.

- D3D11 is not working.  D3D11 supports geometry shaders, but SPIRV-
  Cross does not support translating geometry shaders to HLSL.

- Metal is not working.  Metal does not directly support geometry
  shaders.

Change-Id: Ieb7c44c58b8be5f2e2197bf5133cf6847e6c132d
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/gui/rhi/qrhid3d11.cpp b/src/gui/rhi/qrhid3d11.cpp
index a4ad0d0c93..28c42a293d 100644
--- a/src/gui/rhi/qrhid3d11.cpp
+++ b/src/gui/rhi/qrhid3d11.cpp
@@ -565,6 +565,8 @@ bool QRhiD3D11::isFeatureSupported(QRhi::Feature feature) const
         return true;
     case QRhi::Tessellation:
         return false;
+    case QRhi::GeometryShader:
+        return false;
     default:
         Q_UNREACHABLE();
         return false;