X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fextension.cpp;h=efa4b1a29c9fab1d820b5749217d02515fdf25e6;hb=08abb340625c6d281496095f2a664f27570c2b64;hp=2d57d1d12224155e8b9ade1f3e488c2d35c8e7c7;hpb=cea3c333797cadd9629aefaa5b82243173a02d16;p=libs%2Fgl.git

diff --git a/source/extension.cpp b/source/extension.cpp
index 2d57d1d1..efa4b1a2 100644
--- a/source/extension.cpp
+++ b/source/extension.cpp
@@ -1,62 +1,166 @@
-/* $Id$
-
-This file is part of libmspgl
-Copyright © 2007  Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
 #include <set>
-#include <GL/gl.h>
-#ifndef WIN32
+#if !defined(WIN32) && !defined(__APPLE__)
+#define GLX_GLXEXT_PROTOTYPES
 #include <GL/glx.h>
 #endif
+#include <msp/strings/format.h>
 #include <msp/strings/utils.h>
-#include "arb_shader_objects.h"
-#include "arb_vertex_shader.h"
-#include "except.h"
+#include "error.h"
 #include "extension.h"
+#include "gl.h"
 
 using namespace std;
 
 namespace Msp {
 namespace GL {
 
+Version::Version()
+{
+	major = 0;
+	minor = 0;
+}
+
+Version::Version(unsigned short a, unsigned short i)
+{
+	major = a;
+	minor = i;
+}
+
+Version::Version(const string &s)
+{
+	vector<string> parts = split(s, '.');
+	major = lexical_cast<unsigned>(parts[0]);
+	minor = lexical_cast<unsigned>(parts[1]);
+}
+
+bool Version::operator>=(const Version &other) const
+{
+	return major>other.major || (major==other.major && minor>=other.minor);
+}
+
+
+Extension::Extension(const char *n, InitFunc f):
+	name(n),
+	init_func(f),
+	init_done(false),
+	support(UNSUPPORTED)
+{ }
+
+Extension::operator bool() const
+{
+	if(!init_done)
+	{
+		support = init_func();
+		init_done = true;
+	}
+
+	return support>UNSUPPORTED;
+}
+
+
+Require::Require(const Extension &ext)
+{
+	if(!ext)
+		throw unsupported_extension(ext.get_name());
+}
+
+
 bool is_supported(const string &ext)
 {
 	static set<string> extensions;
-	static bool init_done=false;
+	static bool init_done = false;
 
 	if(!init_done)
 	{
-		if(const char *gl_ext=reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS)))
+		if(const char *gl_ext = reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS)))
 		{
-			vector<string> exts=split(gl_ext);
+			vector<string> exts = split(gl_ext);
 			extensions.insert(exts.begin(), exts.end());
 		}
 
-		/* XXX Conceptually a bit weird place for this, but I couldn't really come up
-		   with anything better that would still be transparent. */
-		if(extensions.count("GL_ARB_shader_objects"))
-			init_arb_shader_objects();
-		if(extensions.count("GL_ARB_vertex_shader"))
-			init_arb_vertex_shader();
+		string renderer = reinterpret_cast<const char *>(glGetString(GL_RENDERER));
+		if(renderer.find("Radeon")!=string::npos)
+		{
+			/* Radeon doesn't process NV_primitive_restart correctly and treats
+			the restart index as a normal element if the indices are stored in a
+			buffer. */
+			extensions.erase("GL_NV_primitive_restart");
+
+			/* AMD's uniform buffer objects only work with the core version of
+			shaders. */
+			if(!(get_gl_version()>=Version(2, 0)))
+				extensions.erase("GL_ARB_uniform_buffer_object");
+		}
+
+		if(const char *disable_ptr = getenv("MSPGL_DISABLE_EXTENSIONS"))
+		{
+			vector<string> disable = split(disable_ptr);
+			for(vector<string>::const_iterator i=disable.begin(); i!=disable.end(); ++i)
+				extensions.erase(*i);
+		}
 
-		init_done=true;
+		init_done = true;
 	}
 
 	return extensions.count(ext);
 }
 
-void require_extension(const string &ext)
+inline Version _get_gl_version()
+{
+	string gl_ver = reinterpret_cast<const char *>(glGetString(GL_VERSION));
+	Version ver(gl_ver.substr(0, gl_ver.find(' ')));
+
+	if(const char *force_ver_ptr = getenv("MSPGL_FORCE_VERSION"))
+	{
+		Version force_ver(force_ver_ptr);
+		if(!(force_ver>=ver))
+			ver = force_ver;
+	}
+
+	return ver;
+}
+
+const Version &get_gl_version()
+{
+	static Version version = _get_gl_version();
+	return version;
+}
+
+inline Version _get_glsl_version()
+{
+	string glsl_ver = reinterpret_cast<const char *>(glGetString(GL_SHADING_LANGUAGE_VERSION));
+	Version ver(glsl_ver.substr(0, glsl_ver.find(' ')));
+
+	if(const char *force_ver_ptr = getenv("MSPGL_FORCE_GLSL_VERSION"))
+	{
+		Version force_ver(force_ver_ptr);
+		if(!(force_ver>=ver))
+			ver = force_ver;
+	}
+
+	return ver;
+}
+
+const Version &get_glsl_version()
+{
+	static Version version = _get_glsl_version();
+	return version;
+}
+
+bool is_version_at_least(unsigned a, unsigned b)
 {
-	if(!is_supported(ext))
-		throw UnsupportedExtension(ext+" is not supported");
+	return get_gl_version()>=Version(a, b);
 }
 
 ExtFunc *get_proc_address(const string &name)
 {
-#ifndef WIN32
-	return glXGetProcAddressARB(reinterpret_cast<const GLubyte *>(name.c_str()));
+#if defined(WIN32)
+	return reinterpret_cast<ExtFunc *>(wglGetProcAddress(name.c_str()));
+#elif defined(__APPLE__)
+	(void)name;
+	return 0;  // Not supported
+#else
+	return glXGetProcAddressARB(reinterpret_cast<const unsigned char *>(name.c_str()));
 #endif
 }