build(deps): Adjust to OIIO change to IC/TS API (#1848)

On the OIIO side, there's a PR in review that changes the ImageCache
and TextureSystem APIs to return shared_ptr instead of raw.
(AcademySoftwareFoundation/OpenImageIO#4377)
This is destined for the upcoming OIIO 3.0 release.

This patch on the OSL side ensures that we build cleanly against both
OIIO 2.x and 3.0.

Signed-off-by: Larry Gritz <lg@larrygritz.com>

Author: lgritz

src/liboslexec/oslexec_pvt.h

@@ -842,7 +842,8 @@ class ShadingSystemImpl {
     void setup_op_descriptors();
 
     RendererServices* m_renderer;  ///< Renderer services
-    TextureSystem* m_texturesys;   ///< Texture system
+    std::shared_ptr<TextureSystem> m_texturesys_sp;
+    TextureSystem* m_texturesys;  ///< Texture system
 
     ErrorHandler* m_err;  ///< Error handler
     mutable std::list<std::string> m_errseen, m_warnseen;

src/liboslexec/rendservices.cpp

@@ -19,6 +19,14 @@ using namespace OSL::pvt;
 OSL_NAMESPACE_ENTER
 
 
+#ifdef OIIO_TEXTURESYSTEM_CREATE_SHARED
+namespace {
+std::mutex shared_texturesys_mutex;
+std::shared_ptr<TextureSystem> shared_texturesys;
+}  // namespace
+#endif
+
+
 
 RendererServices::RendererServices(TextureSystem* texsys) : m_texturesys(texsys)
 {
@@ -31,7 +39,17 @@ RendererServices::RendererServices(TextureSystem* texsys) : m_texturesys(texsys)
         OSL_ASSERT(
             0 && "RendererServices was not passed a working TextureSystem*");
 #else
+#    ifdef OIIO_TEXTURESYSTEM_CREATE_SHARED
+        {
+            std::lock_guard<std::mutex> lock(shared_texturesys_mutex);
+            if (!shared_texturesys) {
+                shared_texturesys = TextureSystem::create(true /* shared */);
+            }
+            m_texturesys = shared_texturesys.get();
+        }
+#    else
         m_texturesys = TextureSystem::create(true /* shared */);
+#    endif
         // Make some good guesses about default options
         m_texturesys->attribute("automip", 1);
         m_texturesys->attribute("autotile", 64);

src/liboslexec/shadingsys.cpp

@@ -1201,7 +1201,12 @@ ShadingSystemImpl::ShadingSystemImpl(RendererServices* renderer,
         OSL_ASSERT(0
                    && "ShadingSystem was not passed a working TextureSystem*");
 #else
+#    if OIIO_TEXTURESYSTEM_CREATE_SHARED
+        m_texturesys_sp = TextureSystem::create(true /* shared */);
+        m_texturesys    = m_texturesys_sp.get();
+#    else
         m_texturesys = TextureSystem::create(true /* shared */);
+#    endif
         // Make some good guesses about default options
         m_texturesys->attribute("automip", 1);
         m_texturesys->attribute("autotile", 64);

src/osl.imageio/oslinput.cpp

@@ -218,15 +218,22 @@ static OIIO::mutex shading_mutex;
 static ShadingSystem* shadingsys       = NULL;
 static OIIO_RendererServices* renderer = NULL;
 static ErrorRecorder errhandler;
-
+static std::shared_ptr<TextureSystem> shared_texsys;
 
 
 static void
 setup_shadingsys()
 {
     OIIO::lock_guard lock(shading_mutex);
     if (!shadingsys) {
-        renderer   = new OIIO_RendererServices(TextureSystem::create(true));
+#if OIIO_TEXTURESYSTEM_CREATE_SHARED
+        if (!shared_texsys)
+            shared_texsys = TextureSystem::create(true);
+        auto ts = shared_texsys.get();
+#else
+        auto ts = TextureSystem::create(true);
+#endif
+        renderer   = new OIIO_RendererServices(ts);
         shadingsys = new ShadingSystem(renderer, NULL, &errhandler);
     }
 }

src/testshade/testshade.cpp

@@ -129,7 +129,6 @@ static char* userdata_base_ptr = nullptr;
 static char* output_base_ptr   = nullptr;
 static bool use_rs_bitcode
     = false;  // use free function bitcode version of renderer services
-
 static int jbufferMB = 16;
 
 // Testshade thread tracking and assignment.
@@ -675,8 +674,12 @@ print_info()
     else
 #endif
         rend = new SimpleRenderer;
-    TextureSystem* texturesys = TextureSystem::create();
+    auto texturesys = TextureSystem::create();
+#if OIIO_TEXTURESYSTEM_CREATE_SHARED
+    shadingsys = new ShadingSystem(rend, texturesys.get(), &errhandler);
+#else
     shadingsys = new ShadingSystem(rend, texturesys, &errhandler);
+#endif
     rend->init_shadingsys(shadingsys);
     set_shadingsys_options();
 
@@ -1963,7 +1966,12 @@ test_shade(int argc, const char* argv[])
     // Request a TextureSystem (by default it will be the global shared
     // one). This isn't strictly necessary, if you pass nullptr to
     // ShadingSystem ctr, it will ask for the shared one internally.
+#if OIIO_TEXTURESYSTEM_CREATE_SHARED
+    std::shared_ptr<TextureSystem> texturesys_owned = TextureSystem::create();
+    TextureSystem* texturesys                       = texturesys_owned.get();
+#else
     TextureSystem* texturesys = TextureSystem::create();
+#endif
 
     // Create a new shading system.  We pass it the RendererServices
     // object that services callbacks from the shading system, the
@@ -2327,8 +2335,8 @@ test_shade(int argc, const char* argv[])
         std::cout << "ERRORS left in TextureSystem:\n" << err << "\n";
         retcode = EXIT_FAILURE;
     }
-    OIIO::ImageCache* ic = texturesys->imagecache();
-    err                  = ic ? ic->geterror() : std::string();
+    auto ic = texturesys->imagecache();
+    err     = ic ? ic->geterror() : std::string();
     if (!err.empty()) {
         std::cout << "ERRORS left in ImageCache:\n" << err << "\n";
         retcode = EXIT_FAILURE;