3 This file is part of libmspgl
4 Copyright © 2007, 2009-2010 Mikko Rasa, Mikkosoft Productions
5 Distributed under the LGPL
10 #define GLX_GLXEXT_PROTOTYPES
13 #include <msp/strings/formatter.h>
14 #include <msp/strings/utils.h>
15 #include "arb_shader_objects.h"
16 #include "arb_vertex_buffer_object.h"
17 #include "arb_vertex_program.h"
18 #include "arb_vertex_shader.h"
19 #include "ext_framebuffer_object.h"
21 #include "extension.h"
23 #include "version_1_2.h"
24 #include "version_1_3.h"
31 bool is_supported(const string &ext)
33 static set<string> extensions;
34 static bool init_done = false;
38 if(const char *gl_ext = reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS)))
40 vector<string> exts = split(gl_ext);
41 extensions.insert(exts.begin(), exts.end());
44 /* XXX Conceptually a bit weird place for this, but I couldn't really come up
45 with anything better that would still be transparent. */
46 if(extensions.count("GL_ARB_shader_objects"))
47 init_arb_shader_objects();
48 if(extensions.count("GL_ARB_vertex_shader"))
49 init_arb_vertex_shader();
50 if(extensions.count("GL_ARB_vertex_program"))
51 init_arb_vertex_program();
52 if(extensions.count("GL_EXT_framebuffer_object"))
53 init_ext_framebuffer_object();
54 if(extensions.count("GL_ARB_vertex_buffer_object"))
55 init_arb_vertex_buffer_object();
60 return extensions.count(ext);
63 void require_extension(const string &ext)
65 if(!is_supported(ext))
66 throw UnsupportedExtension(ext);
69 const Version &get_gl_version()
71 static Version version;
72 static bool init_done = false;
76 string gl_ver = reinterpret_cast<const char *>(glGetString(GL_VERSION));
77 vector<string> parts = split(gl_ver.substr(0, gl_ver.find(' ')), '.');
78 version.major = lexical_cast<unsigned>(parts[0]);
79 version.minor = lexical_cast<unsigned>(parts[1]);
81 unsigned combined = version.major*0x100+version.minor;
93 bool is_version_at_least(unsigned a, unsigned b)
95 const Version &ver = get_gl_version();
96 return (ver.major>a || (ver.major==a && ver.minor>=b));
99 void require_version(unsigned a, unsigned b)
101 if(!is_version_at_least(a, b))
102 throw UnsupportedExtension(format("OpenGL %d.%d", a, b));
105 ExtFunc *get_proc_address(const string &name)
108 return glXGetProcAddressARB(reinterpret_cast<const unsigned char *>(name.c_str()));
110 return reinterpret_cast<ExtFunc *>(wglGetProcAddress(name.c_str()));