OpenGL 4.5 Core DSA versus OpenGL 3.3 Core bind-to-edit with macOS 4.1 ceiling

Answer first

On macOS you cannot obtain a native 4.5 core context, so any code that relies solely on DSA will fail unless a runtime guard is in place. The decision to use DSA or fall back to the bind‑to‑edit path is made after context creation by checking the actual OpenGL version, the core‑profile flag, and the presence of the GL_ARB_direct_state_access extension. GLSL version selection is independent of DSA; you should compile shaders at the lowest common denominator that satisfies all platforms. A 3.3 core baseline provides VAOs, uniform buffer objects, instanced rendering, and GLSL 330, which is sufficient for most shader‑only renderers on Windows, Linux and macOS.

Runtime detection of DSA availability

• After context creation, query glGetIntegerv(GL_MAJOR_VERSION, &major) and glGetIntegerv(GL_MINOR_VERSION, &minor). On macOS this returns 4 and 1; on a 4.5+ core context it will be at least 4 and 5.
• Verify that the context is core by checking glGetIntegerv(GL_CONTEXT_PROFILE_MASK, &mask) for the GL_CONTEXT_CORE_PROFILE_BIT flag.
• Finally, enumerate extensions with glGetIntegerv(GL_NUM_EXTENSIONS, &count) and glGetStringi(GL_EXTENSIONS, i). If the string GL_ARB_direct_state_access is present, the DSA entry points are usable; otherwise you must use the bind‑to‑edit sequence.

GLSL version handling across DSA / bind‑to‑edit paths

GLSL version is tied to the context, not to the method of object manipulation. The safest approach is to target the lowest version you need—typically #version 330 core for a 3.3 baseline. Compile a test shader with that version during startup; if it fails, step down to #version 120 or #version 110 as needed. Once you know the maximum supported version, you can load higher‑version shaders on 4.5+ contexts, but you should keep the base shaders compatible with 3.3 so that the fallback path continues to work.

Is a 3.3 core baseline sufficient?

For most desktop renderers that use VAOs, vertex buffer objects, uniform buffers and simple fragment shading, OpenGL 3.3 core provides all required functionality. It introduces VAOs, GLSL 330, instanced rendering and framebuffer objects. If you need features that first appear in OpenGL 4.0 or later—such as tessellation, geometry shaders with control points, compute shaders, or shader storage buffer objects—you will need a separate fallback path or you will have to drop macOS support.

Missing diagnostic detail that could alter the recommendation

Do you need any of the features that first appear in OpenGL 4.0 or later (e.g., SSBOs, tessellation, compute)? If so, a 3.3 baseline will not suffice and you must either implement per‑feature fallbacks or accept that macOS cannot be supported.