Fix use of OpenGL interop breaking in Hydra viewports that do not support it

Rendering directly to a resource using OpenGL interop and Hgi
doesn't work in Houdini, since it never uses the resulting resource
(it does not call `HdRenderBuffer::GetResource`). But since doing
that simultaneously disables mapping (`HdRenderBuffer::Map` is
not implemented then), nothing was displayed. To fix this, keep
track of whether a Hydra viewport does support displaying a Hgi
resource directly, by checking whether
`HdRenderBuffer::GetResource` is ever called and only enable use
of OpenGL interop if that is the case.

Differential Revision: https://developer.blender.org/D15090

1 files changed, 5 insertions, 4 deletions

diff --git a/intern/cycles/hydra/display_driver.h b/intern/cycles/hydra/display_driver.h
index 20086830e6a..2a05397c325 100644
--- a/intern/cycles/hydra/display_driver.h
+++ b/intern/cycles/hydra/display_driver.h
@@ -19,9 +19,6 @@ class HdCyclesDisplayDriver final : public CCL_NS::DisplayDriver {
   ~HdCyclesDisplayDriver();
 
  private:
-  void init();
-  void deinit();
-
   void next_tile_begin() override;
 
   bool update_begin(const Params &params, int texture_width, int texture_height) override;
@@ -41,6 +38,11 @@ class HdCyclesDisplayDriver final : public CCL_NS::DisplayDriver {
 
   void draw(const Params &params) override;
 
+  void gl_context_create();
+  bool gl_context_enable();
+  void gl_context_disable();
+  void gl_context_dispose();
+
   HdCyclesSession *const _renderParam;
   Hgi *const _hgi;
 
@@ -48,7 +50,6 @@ class HdCyclesDisplayDriver final : public CCL_NS::DisplayDriver {
   void *hdc_ = nullptr;
   void *gl_context_ = nullptr;
 #endif
-
   CCL_NS::thread_mutex mutex_;
 
   PXR_NS::HgiTextureHandle texture_;