- /* There are no profiles before OpenGL 3.2. The
- * WGL_ARB_create_context_profile spec says:
- *
- * "If the requested OpenGL version is less than 3.2,
- * WGL_CONTEXT_PROFILE_MASK_ARB is ignored and the functionality of the
- * context is determined solely by the requested version."
- *
- * The spec also says:
- *
- * "The default value for WGL_CONTEXT_PROFILE_MASK_ARB is
- * WGL_CONTEXT_CORE_PROFILE_BIT_ARB."
- */
- attribs.profile = ST_PROFILE_DEFAULT;
- if ((majorVersion > 3 || (majorVersion == 3 && minorVersion >= 2))
- && ((profileMask & WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB) == 0))
- attribs.profile = ST_PROFILE_OPENGL_CORE;
+ switch (profileMask) {
+ case WGL_CONTEXT_CORE_PROFILE_BIT_ARB:
+ /* There are no profiles before OpenGL 3.2. The
+ * WGL_ARB_create_context_profile spec says:
+ *
+ * "If the requested OpenGL version is less than 3.2,
+ * WGL_CONTEXT_PROFILE_MASK_ARB is ignored and the functionality
+ * of the context is determined solely by the requested version."
+ */
+ if (majorVersion > 3 || (majorVersion == 3 && minorVersion >= 2)) {
+ attribs.profile = ST_PROFILE_OPENGL_CORE;
+ break;
+ }
+ /* fall-through */
+ case WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB:
+ /*
+ * The spec also says:
+ *
+ * "If version 3.1 is requested, the context returned may implement
+ * any of the following versions:
+ *
+ * * Version 3.1. The GL_ARB_compatibility extension may or may not
+ * be implemented, as determined by the implementation.
+ * * The core profile of version 3.2 or greater."
+ *
+ * But Mesa doesn't support GL_ARB_compatibility, while most prevalent
+ * Windows OpenGL implementations do, and unfortunately many Windows
+ * applications don't check whether they receive or not a context with
+ * GL_ARB_compatibility, so returning a core profile here does more harm
+ * than good.
+ */
+ attribs.profile = ST_PROFILE_DEFAULT;
+ break;
+ case WGL_CONTEXT_ES_PROFILE_BIT_EXT:
+ if (majorVersion >= 2) {
+ attribs.profile = ST_PROFILE_OPENGL_ES2;
+ } else {
+ attribs.profile = ST_PROFILE_OPENGL_ES1;
+ }
+ break;
+ default:
+ assert(0);
+ goto no_st_ctx;
+ }