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Update macOS OpenGL compatibility notes

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This commit is contained in:
Camilla Löwy 2024-04-07 20:03:37 +02:00
parent 97892c6037
commit dfebad786d
2 changed files with 23 additions and 20 deletions
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35
docs/compat.md
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@ -242,24 +242,27 @@ extensions are unavailable, the `GLFW_SRGB_CAPABLE` hint will have no effect.
## OpenGL on macOS {#compat_osx} ## OpenGL on macOS {#compat_osx}
Support for OpenGL 3.2 and above was introduced with OS X 10.7 and even then macOS (as of version 14) still provides OpenGL but it has been deprecated by
only forward-compatible, core profile contexts are supported. Support for Apple. While the API is still available, it is poorly maintained and frequently
OpenGL 4.1 was introduced with OS X 10.9, also limited to forward-compatible, develops new issues. On modern systems, OpenGL is implemented on top of Metal
core profile contexts. There is also still no mechanism for requesting debug and is not fully thread-safe.
contexts or no-error contexts. Versions of Mac OS X earlier than 10.7 support
at most OpenGL version 2.1.
Because of this, on OS X 10.7 and later, the `GLFW_CONTEXT_VERSION_MAJOR` and macOS does not support OpenGL stereo rendering. If the `GLFW_STEREO` hint is
`GLFW_CONTEXT_VERSION_MINOR` hints will cause @ref glfwCreateWindow to fail if set to true, OpenGL context creation will always fail.
given version 3.0 or 3.1. The `GLFW_OPENGL_PROFILE` hint must be set to
`GLFW_OPENGL_CORE_PROFILE` when creating OpenGL 3.2 and later contexts. The
`GLFW_CONTEXT_DEBUG` and `GLFW_CONTEXT_NO_ERROR` hints are ignored.
Also, on Mac OS X 10.6 and below, the `GLFW_CONTEXT_VERSION_MAJOR` and macOS only supports OpenGL core profile contexts that are forward-compatible,
`GLFW_CONTEXT_VERSION_MINOR` hints will fail if given a version above 2.1, but the `GLFW_OPENGL_FORWARD_COMPAT` hint is ignored since GLFW 3.4. Even if
setting the `GLFW_OPENGL_PROFILE` or `GLFW_OPENGL_FORWARD_COMPAT` hints to this hint is set to false (the default), a forward-compatible context will be
a non-default value will cause @ref glfwCreateWindow to fail and the returned if available.
`GLFW_CONTEXT_DEBUG` hint is ignored.
macOS does not support OpenGL debug contexts, no-error contexts or robustness.
The `GLFW_CONTEXT_DEBUG`, `GLFW_CONTEXT_NO_ERROR` and `GLFW_CONTEXT_ROBUSTNESS`
hints will be ignored and a context without these features will be returned.
macOS does not flush OpenGL contexts when they are made non-current. The
`GLFW_CONTEXT_RELEASE_BEHAVIOR` hint is ignored and the release behavior will
always be the equivalent of `GLFW_RELEASE_BEHAVIOR_NONE`. If you need a context
to be flushed, call `glFlush` before making it non-current.
## Vulkan loader and API {#compat_vulkan} ## Vulkan loader and API {#compat_vulkan}

8
src/nsgl_context.m
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@ -183,16 +183,16 @@ GLFWbool _glfwCreateContextNSGL(_GLFWwindow* window,
return GLFW_FALSE; return GLFW_FALSE;
} }
// Context robustness modes (GL_KHR_robustness) are not yet supported by // Context robustness modes (GL_KHR_robustness) are not supported by
// macOS but are not a hard constraint, so ignore and continue // macOS but are not a hard constraint, so ignore and continue
// Context release behaviors (GL_KHR_context_flush_control) are not yet // Context release behaviors (GL_KHR_context_flush_control) are not
// supported by macOS but are not a hard constraint, so ignore and continue // supported by macOS but are not a hard constraint, so ignore and continue
// Debug contexts (GL_KHR_debug) are not yet supported by macOS but are not // Debug contexts (GL_KHR_debug) are not supported by macOS but are not
// a hard constraint, so ignore and continue // a hard constraint, so ignore and continue
// No-error contexts (GL_KHR_no_error) are not yet supported by macOS but // No-error contexts (GL_KHR_no_error) are not supported by macOS but
// are not a hard constraint, so ignore and continue // are not a hard constraint, so ignore and continue
#define ADD_ATTRIB(a) \ #define ADD_ATTRIB(a) \