Add SetSRGBDisabled() to disable sRGB framebuffer

jf--- · jf--- · commit 8bfd75b6fecd · 2025-12-04T20:51:13.000+01:00
- exposes OpenGl_Caps::sRGBDisable via Display3d API
- fixes GL_SRGB8_ALPHA8 texture error on macOS Core Profile
- must call before Init()/InitOffscreen()
diff --git a/src/Visualization/Display3d.cpp b/src/Visualization/Display3d.cpp
@@ -318,3 +318,13 @@ void Display3d::SetBuffersNoSwap(Standard_Boolean theNoSwap)
   // their own buffer swapping.
   GetGraphicDriver()->ChangeOptions().buffersNoSwap = theNoSwap;
 }
+
+void Display3d::SetSRGBDisabled(Standard_Boolean theDisabled)
+{
+  // Disable sRGB rendering (OFF by default in OCCT).
+  // When enabled, OCCT won't attempt to create sRGB framebuffers.
+  // Useful for macOS where GL_SRGB8_ALPHA8 format may not be supported
+  // in certain contexts.
+  // Must be called BEFORE Init()/InitOffscreen() to take effect.
+  GetGraphicDriver()->ChangeOptions().sRGBDisable = theDisabled;
+}
diff --git a/src/Visualization/Visualization.h b/src/Visualization/Visualization.h
@@ -74,6 +74,7 @@ class Display3d
   Standard_EXPORT void SetContextCompatible(Standard_Boolean theCompatible);
   Standard_EXPORT void SetFfpEnable(Standard_Boolean theEnabled);
   Standard_EXPORT void SetBuffersNoSwap(Standard_Boolean theNoSwap);
+  Standard_EXPORT void SetSRGBDisabled(Standard_Boolean theDisabled);
 
   Standard_EXPORT Handle_V3d_View& GetView() {return myV3dView;};
 	Standard_EXPORT Handle_V3d_Viewer& GetViewer() {return myV3dViewer;};
diff --git a/src/Visualization/Visualization.i b/src/Visualization/Visualization.i
@@ -89,6 +89,8 @@ class Display3d {
     void SetFfpEnable(bool theEnabled);
     %feature("autodoc", "1");
     void SetBuffersNoSwap(bool theNoSwap);
+    %feature("autodoc", "1");
+    void SetSRGBDisabled(bool theDisabled);
 };
 
 %extend Display3d {
