Add a function to determine the active GL profile

[libs/gl.git] / source / extension.h

diff --git a/source/extension.h b/source/extension.h
index 69308241d96e3bd16867ff9d0f2c68d2defcaa12..85b4fc4af27e0418bf9d4c09932ad835899724f6 100644 (file)
--- a/source/extension.h
+++ b/source/extension.h
@@ -1,65 +1,91 @@
 #ifndef MSP_GL_EXTENSION_H_
 #define MSP_GL_EXTENSION_H_
 
-#include <msp/core/except.h>
+#include <string>
 
 namespace Msp {
 namespace GL {
 
+enum GLApi
+{
+       OPENGL,
+       OPENGL_ES2
+};
+
+enum GLProfile
+{
+       CORE_PROFILE,
+       COMPATIBILITY_PROFILE
+};
+
+
 struct Version
 {
        unsigned short major;
        unsigned short minor;
-};
 
-typedef void ExtFunc();
+       Version();
+       Version(unsigned short, unsigned short);
+       Version(const std::string &);
 
-/**
-Indicates whether an extension is supported.  If this returns true, the
-functions of that extension are safe to use.
-*/
-bool is_supported(const std::string &);
+       bool operator>=(const Version &) const;
+};
 
-/**
-Checks that an extension is supported and throws if it isn't.
-*/
-void require_extension(const std::string &);
 
-/**
-RAII version of require_extension.  Useful as a static local variable.
-*/
-struct RequireExtension
+class Extension
 {
-       RequireExtension(const std::string &e) { require_extension(e); }
-};
+public:
+       enum SupportLevel
+       {
+               UNSUPPORTED,
+               EXTENSION,
+               CORE
+       };
 
-/**
-Returns the OpenGL version number, as reported by the implementation.
-Functions up to the returned version are safe to use.
-*/
-const Version &get_gl_version();
+       typedef SupportLevel (*InitFunc)();
 
-/**
-Indicates whether the OpenGL version is at least a.b.
-*/
-bool is_version_at_least(unsigned a, unsigned b);
+private:
+       const char *name;
+       InitFunc init_func;
+       mutable bool init_done;
+       mutable SupportLevel support;
 
-/**
-Checks that the OpenGL version is at least a.b and throws if it isn't.
-*/
-void require_version(unsigned a, unsigned b);
+public:
+       Extension(const char *, InitFunc);
 
-/**
-RAII version of require_version.  Useful as a static local variable.
-*/
-struct RequireVersion
+       const char *get_name() const { return name; }
+       operator bool() const;
+};
+
+
+struct Require
 {
-       RequireVersion(unsigned a, unsigned b) { require_version(a, b); }
+       Require(const Extension &);
 };
 
-/**
-Returns the address of an extension function.  Only indended for internal use.
-*/
+
+typedef void ExtFunc();
+
+/** Indicates whether an extension is supported. */
+bool is_supported(const std::string &);
+
+/** Returns the API for which the library was compiled. */
+GLApi get_gl_api();
+
+/** Returns the OpenGL profile for the active context. */
+GLProfile get_gl_profile();
+
+/** Returns the OpenGL version number, as reported by the implementation. */
+const Version &get_gl_version();
+
+/** Returns the GLSL version number, as reported by the implementation. */
+const Version &get_glsl_version();
+
+/** Indicates whether the OpenGL version is at least a.b. */
+bool is_version_at_least(unsigned a, unsigned b);
+
+/** Returns the address of an extension function.  Only indended for internal
+use. */
 ExtFunc *get_proc_address(const std::string &);
 
 } // namespace GL