3 This file is part of libmspgl
4 Copyright © 2007, 2009-2011 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_blit.h"
20 #include "ext_framebuffer_multisample.h"
21 #include "ext_framebuffer_object.h"
23 #include "extension.h"
25 #include "nv_primitive_restart.h"
26 #include "version_1_2.h"
27 #include "version_1_3.h"
34 bool is_supported(const string &ext)
36 static set<string> extensions;
37 static bool init_done = false;
41 if(const char *gl_ext = reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS)))
43 vector<string> exts = split(gl_ext);
44 extensions.insert(exts.begin(), exts.end());
47 /* XXX Conceptually a bit weird place for this, but I couldn't really come up
48 with anything better that would still be transparent. */
49 if(extensions.count("GL_ARB_shader_objects"))
50 init_arb_shader_objects();
51 if(extensions.count("GL_ARB_vertex_shader"))
52 init_arb_vertex_shader();
53 if(extensions.count("GL_ARB_vertex_program"))
54 init_arb_vertex_program();
55 if(extensions.count("GL_EXT_framebuffer_object"))
56 init_ext_framebuffer_object();
57 if(extensions.count("GL_EXT_framebuffer_blit"))
58 init_ext_framebuffer_blit();
59 if(extensions.count("GL_EXT_framebuffer_multisample"))
60 init_ext_framebuffer_multisample();
61 if(extensions.count("GL_ARB_vertex_buffer_object"))
62 init_arb_vertex_buffer_object();
63 if(extensions.count("GL_NV_primitive_restart"))
64 init_nv_primitive_restart();
69 return extensions.count(ext);
72 void require_extension(const string &ext)
74 if(!is_supported(ext))
75 throw UnsupportedExtension(ext);
78 const Version &get_gl_version()
80 static Version version;
81 static bool init_done = false;
85 string gl_ver = reinterpret_cast<const char *>(glGetString(GL_VERSION));
86 vector<string> parts = split(gl_ver.substr(0, gl_ver.find(' ')), '.');
87 version.major = lexical_cast<unsigned>(parts[0]);
88 version.minor = lexical_cast<unsigned>(parts[1]);
90 unsigned combined = version.major*0x100+version.minor;
102 bool is_version_at_least(unsigned a, unsigned b)
104 const Version &ver = get_gl_version();
105 return (ver.major>a || (ver.major==a && ver.minor>=b));
108 void require_version(unsigned a, unsigned b)
110 if(!is_version_at_least(a, b))
111 throw UnsupportedExtension(format("OpenGL %d.%d", a, b));
114 ExtFunc *get_proc_address(const string &name)
117 return glXGetProcAddressARB(reinterpret_cast<const unsigned char *>(name.c_str()));
119 return reinterpret_cast<ExtFunc *>(wglGetProcAddress(name.c_str()));