X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Fextension.h;h=cf824e24b0a189b65fc88de30adc6dc862fb5e09;hp=69308241d96e3bd16867ff9d0f2c68d2defcaa12;hb=b38a4cba9d2a9963a0937757eff9e955f18ddf2a;hpb=f14435e58bfa0fa697a06ba9a454bb30cd37d9d8

diff --git a/source/extension.h b/source/extension.h
index 69308241..cf824e24 100644
--- a/source/extension.h
+++ b/source/extension.h
@@ -1,65 +1,102 @@
 #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;
+	bool operator<(const Version &o) const { return !(*this>=o); }
+	operator bool() const { return major || minor; }
+};
 
-/**
-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.
+Holds metadata about an extension.  Evaluates to true if the extension is
+supported.
 */
-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();
+
+/** Checks for extension support.  Only intended for internal use. */
+bool is_supported(const std::string &);
+
+/** Checks for OpenGL version support.  Only intended for internal use. */
+bool is_supported(const Version &, const Version & = Version());
+
+/** Indicates whether an extension has been disabled, either explicitly through
+the MSPGL_DISABLE_EXTENSIONS environment variable or implicitly as a workaround
+for a driver bug.  Only intended for internal use. */
+bool is_disabled(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();
+
+/** Returns the address of an extension function.  Only indended for internal
+use. */
 ExtFunc *get_proc_address(const std::string &);
 
 } // namespace GL