#include "util/gl_extensions.hpp"

#include "display_kernel.hpp"

namespace cvisual {

template <class PFN>

void getPFN( PFN& func, display_kernel& d, const char* name ) {

func = reinterpret_cast<PFN>( d.getProcAddress( name ) );

if (!func)

throw std::runtime_error(

("Unable to get extension function: " +

(std::string)name + " even though the extension is advertised.").c_str() );

}

gl_extensions::gl_extensions() {

memset( this, 0, sizeof(this) );

}

void gl_extensions::init( display_kernel& d ) {

#define F( name ) getPFN( name, d, #name )

//printf("t: %p\n", &glBegin);

//printf("%p\n", d.getProcAddress("glBegin"));

if ( ARB_shader_objects = d.hasExtension( "GL_ARB_shader_objects" ) ) {

F( glCreateProgramObjectARB );

F( glLinkProgramARB );

F( glUseProgramObjectARB );

F( glCreateShaderObjectARB );

F( glShaderSourceARB );

F( glCompileShaderARB );

F( glAttachObjectARB );

F( glDeleteObjectARB );

F( glGetHandleARB );

F( glUniform1iARB );

F( glUniformMatrix4fvARB );

F( glUniform4fvARB );

F( glGetUniformLocationARB );

F( glGetObjectParameterivARB );

F( glGetInfoLogARB );

}

if ( EXT_texture3D = d.hasExtension( "GL_EXT_texture3D" ) ) {

F( glTexImage3D );

F( glTexSubImage3D );

} else {

#ifdef __APPLE__

// Supported natively but NOT as an extension

EXT_texture3D = true;

glTexImage3D = ::glTexImage3D;

glTexSubImage3D = ::glTexSubImage3D;

#endif

}

if ( ARB_multitexture = d.hasExtension( "GL_ARB_multitexture" ) ) {

F( glActiveTexture );

}

if ( ARB_point_parameters = d.hasExtension( "GL_ARB_point_parameters" ) ) {

F( glPointParameterfvARB );

}

}

} // namespace cvisual