irrlicht/source/Irrlicht/COpenGLExtensionHandler.h

// Copyright (C) 2002-2007 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in Irrlicht.h

#ifndef __C_OPEN_GL_FEATURE_MAP_H_INCLUDED__
#define __C_OPEN_GL_FEATURE_MAP_H_INCLUDED__

#include "EDriverFeatures.h"
#include "irrTypes.h"

#if defined(_IRR_WINDOWS_API_)
	// include windows headers for HWND
	#define WIN32_LEAN_AND_MEAN
	#include <windows.h>
	#include <GL/gl.h>
	#include <GL/glu.h>
	#include "glext.h"
#ifdef _MSC_VER
	#pragma comment(lib, "OpenGL32.lib")
	#pragma comment(lib, "GLu32.lib")
#endif
#elif defined(MACOSX)
	#define GL_EXT_texture_env_combine 1
	#include "CIrrDeviceMacOSX.h"
	#include <OpenGL/gl.h>
	#include <OpenGL/glu.h>
	#include <OpenGL/glext.h>
#elif defined(_IRR_USE_SDL_DEVICE_)
	#if defined(_IRR_OPENGL_USE_EXTPOINTER_)
		#define GL_GLEXT_LEGACY 1
		#define GLX_GLXEXT_LEGACY 1
	#else
		#define GL_GLEXT_PROTOTYPES 1
		#define GLX_GLXEXT_PROTOTYPES 1
	#endif
	#include <SDL/SDL_opengl.h>
	#define NO_SDL_GLEXT
	#include "glext.h"
#else
	#if defined(_IRR_OPENGL_USE_EXTPOINTER_)
		#define GL_GLEXT_LEGACY 1
		#define GLX_GLXEXT_LEGACY 1
	#else
		#define GL_GLEXT_PROTOTYPES 1
		#define GLX_GLXEXT_PROTOTYPES 1
	#endif
	#include <GL/gl.h>
	#include <GL/glu.h>
	#include <GL/glx.h>
	#if defined(_IRR_OPENGL_USE_EXTPOINTER_)
	#include "glext.h"
	#undef GLX_ARB_get_proc_address // avoid problems with local glxext.h
	#include "glxext.h"
	#endif
#endif


namespace irr
{
namespace video
{

static const char* const OpenGLFeatureStrings[] = {
	"GL_3DFX_multisample",
	"GL_3DFX_tbuffer",
	"GL_3DFX_texture_compression_FXT1",
	"GL_APPLE_client_storage",
	"GL_APPLE_element_array",
	"GL_APPLE_fence",
	"GL_APPLE_flush_buffer_range",
	"GL_APPLE_specular_vector",
	"GL_APPLE_transform_hint",
	"GL_APPLE_vertex_array_object",
	"GL_APPLE_vertex_array_range",
	"GL_APPLE_ycbcr_422",
	"GL_ARB_color_buffer_float",
	"GL_ARB_depth_texture",
	"GL_ARB_draw_buffers",
	"GL_ARB_fragment_program",
	"GL_ARB_fragment_program_shadow",
	"GL_ARB_fragment_shader",
	"GL_ARB_half_float_pixel",
	"GL_ARB_imaging",
	"GL_ARB_matrix_palette",
	"GL_ARB_multisample",
	"GL_ARB_multitexture",
	"GL_ARB_occlusion_query",
	"GL_ARB_pixel_buffer_object",
	"GL_ARB_point_parameters",
	"GL_ARB_point_sprite",
	"GL_ARB_shader_objects",
	"GL_ARB_shading_language_100",
	"GL_ARB_shadow",
	"GL_ARB_shadow_ambient",
	"GL_ARB_texture_border_clamp",
	"GL_ARB_texture_compression",
	"GL_ARB_texture_cube_map",
	"GL_ARB_texture_env_add",
	"GL_ARB_texture_env_combine",
	"GL_ARB_texture_env_crossbar",
	"GL_ARB_texture_env_dot3",
	"GL_ARB_texture_float",
	"GL_ARB_texture_mirrored_repeat",
	"GL_ARB_texture_non_power_of_two",
	"GL_ARB_texture_rectangle",
	"GL_ARB_transpose_matrix",
	"GL_ARB_vertex_blend",
	"GL_ARB_vertex_buffer_object",
	"GL_ARB_vertex_program",
	"GL_ARB_vertex_shader",
	"GL_ARB_window_pos",
	"GL_ATI_draw_buffers",
	"GL_ATI_element_array",
	"GL_ATI_envmap_bumpmap",
	"GL_ATI_fragment_shader",
	"GL_ATI_map_object_buffer",
	"GL_ATI_pixel_format_float",
	"GL_ATI_pn_triangles",
	"GL_ATI_separate_stencil",
	"GL_ATI_text_fragment_shader",
	"GL_ATI_texture_env_combine3",
	"GL_ATI_texture_float",
	"GL_ATI_texture_mirror_once",
	"GL_ATI_vertex_array_object",
	"GL_ATI_vertex_attrib_array_object",
	"GL_ATI_vertex_streams",
	"GL_EXT_422_pixels",
	"GL_EXT_abgr",
	"GL_EXT_bgra",
	"GL_EXT_bindable_uniform",
	"GL_EXT_blend_color",
	"GL_EXT_blend_equation_separate",
	"GL_EXT_blend_func_separate",
	"GL_EXT_blend_logic_op",
	"GL_EXT_blend_minmax",
	"GL_EXT_blend_subtract",
	"GL_EXT_clip_volume_hint",
	"GL_EXT_cmyka",
	"GL_EXT_color_subtable",
	"GL_EXT_compiled_vertex_array",
	"GL_EXT_convolution",
	"GL_EXT_coordinate_frame",
	"GL_EXT_copy_texture",
	"GL_EXT_cull_vertex",
	"GL_EXT_depth_bounds_test",
	"GL_EXT_draw_buffers2",
	"GL_EXT_draw_instanced",
	"GL_EXT_draw_range_elements",
	"GL_EXT_fog_coord",
	"GL_EXT_framebuffer_blit",
	"GL_EXT_framebuffer_multisample",
	"GL_EXT_framebuffer_object",
	"GL_EXT_framebuffer_sRGB",
	"GL_EXT_geometry_shader4",
	"GL_EXT_gpu_program_parameters",
	"GL_EXT_gpu_shader4",
	"GL_EXT_histogram",
	"GL_EXT_index_array_formats",
	"GL_EXT_index_func",
	"GL_EXT_index_material",
	"GL_EXT_index_texture",
	"GL_EXT_light_texture",
	"GL_EXT_misc_attribute",
	"GL_EXT_multi_draw_arrays",
	"GL_EXT_multisample",
	"GL_EXT_packed_depth_stencil",
	"GL_EXT_packed_float",
	"GL_EXT_packed_pixels",
	"GL_EXT_paletted_texture",
	"GL_EXT_pixel_buffer_object",
	"GL_EXT_pixel_transform",
	"GL_EXT_pixel_transform_color_table",
	"GL_EXT_point_parameters",
	"GL_EXT_polygon_offset",
	"GL_EXT_rescale_normal",
	"GL_EXT_secondary_color",
	"GL_EXT_separate_specular_color",
	"GL_EXT_shadow_funcs",
	"GL_EXT_shared_texture_palette",
	"GL_EXT_stencil_clear_tag",
	"GL_EXT_stencil_two_side",
	"GL_EXT_stencil_wrap",
	"GL_EXT_subtexture",
	"GL_EXT_texture",
	"GL_EXT_texture3D",
	"GL_EXT_texture_array",
	"GL_EXT_texture_buffer_object",
	"GL_EXT_texture_compression_latc",
	"GL_EXT_texture_compression_rgtc",
	"GL_EXT_texture_compression_s3tc",
	"GL_EXT_texture_cube_map",
	"GL_EXT_texture_env_add",
	"GL_EXT_texture_env_combine",
	"GL_EXT_texture_env_dot3",
	"GL_EXT_texture_filter_anisotropic",
	"GL_EXT_texture_integer",
	"GL_EXT_texture_lod_bias",
	"GL_EXT_texture_mirror_clamp",
	"GL_EXT_texture_object",
	"GL_EXT_texture_perturb_normal",
	"GL_EXT_texture_shared_exponent",
	"GL_EXT_texture_sRGB",
	"GL_EXT_timer_query",
	"GL_EXT_vertex_array",
	"GL_EXT_vertex_shader",
	"GL_EXT_vertex_weighting",
	"GL_FfdMaskSGIX",
	"GL_GREMEDY_string_marker",
	"GL_HP_convolution_border_modes",
	"GL_HP_image_transform",
	"GL_HP_occlusion_test",
	"GL_HP_texture_lighting",
	"GL_IBM_cull_vertex",
	"GL_IBM_multimode_draw_arrays",
	"GL_IBM_rasterpos_clip",
	"GL_IBM_texture_mirrored_repeat",
	"GL_IBM_vertex_array_lists",
	"GL_INGR_blend_func_separate",
	"GL_INGR_color_clamp",
	"GL_INGR_interlace_read",
	"GL_INGR_palette_buffer",
	"GL_INTEL_parallel_arrays",
	"GL_INTEL_texture_scissor",
	"GL_MESA_pack_invert",
	"GL_MESA_resize_buffers",
	"GL_MESA_window_pos",
	"GL_MESAX_texture_stack",
	"GL_MESA_ycbcr_texture",
	"GL_NV_blend_square",
	"GL_NV_copy_depth_to_color",
	"GL_NV_depth_buffer_float",
	"GL_NV_depth_clamp",
	"GL_NV_evaluators",
	"GL_NV_fence",
	"GL_NV_float_buffer",
	"GL_NV_fog_distance",
	"GL_NV_fragment_program",
	"GL_NV_fragment_program2",
	"GL_NV_fragment_program4",
	"GL_NV_fragment_program_option",
	"GL_NV_framebuffer_multisample_coverage",
	"GL_NV_geometry_program4",
	"GL_NV_geometry_shader4",
	"GL_NV_gpu_program4",
	"GL_NV_half_float",
	"GL_NV_light_max_exponent",
	"GL_NV_multisample_filter_hint",
	"GL_NV_occlusion_query",
	"GL_NV_packed_depth_stencil",
	"GL_NV_parameter_buffer_object",
	"GL_NV_pixel_data_range",
	"GL_NV_point_sprite",
	"GL_NV_primitive_restart",
	"GL_NV_register_combiners",
	"GL_NV_register_combiners2",
	"GL_NV_texgen_emboss",
	"GL_NV_texgen_reflection",
	"GL_NV_texture_compression_vtc",
	"GL_NV_texture_env_combine4",
	"GL_NV_texture_expand_normal",
	"GL_NV_texture_rectangle",
	"GL_NV_texture_shader",
	"GL_NV_texture_shader2",
	"GL_NV_texture_shader3",
	"GL_NV_transform_feedback",
	"GL_NV_vertex_array_range",
	"GL_NV_vertex_array_range2",
	"GL_NV_vertex_program",
	"GL_NV_vertex_program1_1",
	"GL_NV_vertex_program2",
	"GL_NV_vertex_program2_option",
	"GL_NV_vertex_program3",
	"GL_NV_vertex_program4",
	"GL_OES_read_format",
	"GL_OML_interlace",
	"GL_OML_resample",
	"GL_OML_subsample",
	"GL_PGI_misc_hints",
	"GL_PGI_vertex_hints",
	"GL_REND_screen_coordinates",
	"GL_S3_s3tc",
	"GL_SGI_color_matrix",
	"GL_SGI_color_table",
	"GL_SGI_depth_pass_instrument",
	"GL_SGIS_detail_texture",
	"GL_SGIS_fog_function",
	"GL_SGIS_generate_mipmap",
	"GL_SGIS_multisample",
	"GL_SGIS_pixel_texture",
	"GL_SGIS_point_line_texgen",
	"GL_SGIS_point_parameters",
	"GL_SGIS_sharpen_texture",
	"GL_SGIS_texture4D",
	"GL_SGIS_texture_border_clamp",
	"GL_SGIS_texture_color_mask",
	"GL_SGIS_texture_edge_clamp",
	"GL_SGIS_texture_filter4",
	"GL_SGIS_texture_lod",
	"GL_SGIS_texture_select",
	"GL_SGI_texture_color_table",
	"GL_SGIX_async",
	"GL_SGIX_async_histogram",
	"GL_SGIX_async_pixel",
	"GL_SGIX_blend_alpha_minmax",
	"GL_SGIX_calligraphic_fragment",
	"GL_SGIX_clipmap",
	"GL_SGIX_convolution_accuracy",
	"GL_SGIX_depth_pass_instrument",
	"GL_SGIX_depth_texture",
	"GL_SGIX_flush_raster",
	"GL_SGIX_fog_offset",
	"GL_SGIX_fog_scale",
	"GL_SGIX_fragment_lighting",
	"GL_SGIX_framezoom",
	"GL_SGIX_igloo_interface",
	"GL_SGIX_impact_pixel_texture",
	"GL_SGIX_instruments",
	"GL_SGIX_interlace",
	"GL_SGIX_ir_instrument1",
	"GL_SGIX_list_priority",
	"GL_SGIX_pixel_texture",
	"GL_SGIX_pixel_tiles",
	"GL_SGIX_polynomial_ffd",
	"GL_SGIX_reference_plane",
	"GL_SGIX_resample",
	"GL_SGIX_scalebias_hint",
	"GL_SGIX_shadow",
	"GL_SGIX_shadow_ambient",
	"GL_SGIX_sprite",
	"GL_SGIX_subsample",
	"GL_SGIX_tag_sample_buffer",
	"GL_SGIX_texture_add_env",
	"GL_SGIX_texture_coordinate_clamp",
	"GL_SGIX_texture_lod_bias",
	"GL_SGIX_texture_multi_buffer",
	"GL_SGIX_texture_scale_bias",
	"GL_SGIX_texture_select",
	"GL_SGIX_vertex_preclip",
	"GL_SGIX_ycrcb",
	"GL_SGIX_ycrcba",
	"GL_SGIX_ycrcb_subsample",
	"GL_SUN_convolution_border_modes",
	"GL_SUN_global_alpha",
	"GL_SUN_mesh_array",
	"GL_SUN_slice_accum",
	"GL_SUN_triangle_list",
	"GL_SUN_vertex",
	"GL_SUNX_constant_data",
	"GL_WIN_phong_shading",
	"GL_WIN_specular_fog"
};


class COpenGLExtensionHandler
{
	enum EOpenGLFeatures {
		IRR_3DFX_multisample = 0,
		IRR_3DFX_tbuffer,
		IRR_3DFX_texture_compression_FXT1,
		IRR_APPLE_client_storage,
		IRR_APPLE_element_array,
		IRR_APPLE_fence,
		IRR_APPLE_flush_buffer_range,
		IRR_APPLE_specular_vector,
		IRR_APPLE_transform_hint,
		IRR_APPLE_vertex_array_object,
		IRR_APPLE_vertex_array_range,
		IRR_APPLE_ycbcr_422,
		IRR_ARB_color_buffer_float,
		IRR_ARB_depth_texture,
		IRR_ARB_draw_buffers,
		IRR_ARB_fragment_program,
		IRR_ARB_fragment_program_shadow,
		IRR_ARB_fragment_shader,
		IRR_ARB_half_float_pixel,
		IRR_ARB_imaging,
		IRR_ARB_matrix_palette,
		IRR_ARB_multisample,
		IRR_ARB_multitexture,
		IRR_ARB_occlusion_query,
		IRR_ARB_pixel_buffer_object,
		IRR_ARB_point_parameters,
		IRR_ARB_point_sprite,
		IRR_ARB_shader_objects,
		IRR_ARB_shading_language_100,
		IRR_ARB_shadow,
		IRR_ARB_shadow_ambient,
		IRR_ARB_texture_border_clamp,
		IRR_ARB_texture_compression,
		IRR_ARB_texture_cube_map,
		IRR_ARB_texture_env_add,
		IRR_ARB_texture_env_combine,
		IRR_ARB_texture_env_crossbar,
		IRR_ARB_texture_env_dot3,
		IRR_ARB_texture_float,
		IRR_ARB_texture_mirrored_repeat,
		IRR_ARB_texture_non_power_of_two,
		IRR_ARB_texture_rectangle,
		IRR_ARB_transpose_matrix,
		IRR_ARB_vertex_blend,
		IRR_ARB_vertex_buffer_object,
		IRR_ARB_vertex_program,
		IRR_ARB_vertex_shader,
		IRR_ARB_window_pos,
		IRR_ATI_draw_buffers,
		IRR_ATI_element_array,
		IRR_ATI_envmap_bumpmap,
		IRR_ATI_fragment_shader,
		IRR_ATI_map_object_buffer,
		IRR_ATI_pixel_format_float,
		IRR_ATI_pn_triangles,
		IRR_ATI_separate_stencil,
		IRR_ATI_text_fragment_shader,
		IRR_ATI_texture_env_combine3,
		IRR_ATI_texture_float,
		IRR_ATI_texture_mirror_once,
		IRR_ATI_vertex_array_object,
		IRR_ATI_vertex_attrib_array_object,
		IRR_ATI_vertex_streams,
		IRR_EXT_422_pixels,
		IRR_EXT_abgr,
		IRR_EXT_bgra,
		IRR_EXT_bindable_uniform,
		IRR_EXT_blend_color,
		IRR_EXT_blend_equation_separate,
		IRR_EXT_blend_func_separate,
		IRR_EXT_blend_logic_op,
		IRR_EXT_blend_minmax,
		IRR_EXT_blend_subtract,
		IRR_EXT_clip_volume_hint,
		IRR_EXT_cmyka,
		IRR_EXT_color_subtable,
		IRR_EXT_compiled_vertex_array,
		IRR_EXT_convolution,
		IRR_EXT_coordinate_frame,
		IRR_EXT_copy_texture,
		IRR_EXT_cull_vertex,
		IRR_EXT_depth_bounds_test,
		IRR_EXT_draw_buffers2,
		IRR_EXT_draw_instanced,
		IRR_EXT_draw_range_elements,
		IRR_EXT_fog_coord,
		IRR_EXT_framebuffer_blit,
		IRR_EXT_framebuffer_multisample,
		IRR_EXT_framebuffer_object,
		IRR_EXT_framebuffer_sRGB,
		IRR_EXT_geometry_shader4,
		IRR_EXT_gpu_program_parameters,
		IRR_EXT_gpu_shader4,
		IRR_EXT_histogram,
		IRR_EXT_index_array_formats,
		IRR_EXT_index_func,
		IRR_EXT_index_material,
		IRR_EXT_index_texture,
		IRR_EXT_light_texture,
		IRR_EXT_misc_attribute,
		IRR_EXT_multi_draw_arrays,
		IRR_EXT_multisample,
		IRR_EXT_packed_depth_stencil,
		IRR_EXT_packed_float,
		IRR_EXT_packed_pixels,
		IRR_EXT_paletted_texture,
		IRR_EXT_pixel_buffer_object,
		IRR_EXT_pixel_transform,
		IRR_EXT_pixel_transform_color_table,
		IRR_EXT_point_parameters,
		IRR_EXT_polygon_offset,
		IRR_EXT_rescale_normal,
		IRR_EXT_secondary_color,
		IRR_EXT_separate_specular_color,
		IRR_EXT_shadow_funcs,
		IRR_EXT_shared_texture_palette,
		IRR_EXT_stencil_clear_tag,
		IRR_EXT_stencil_two_side,
		IRR_EXT_stencil_wrap,
		IRR_EXT_subtexture,
		IRR_EXT_texture,
		IRR_EXT_texture3D,
		IRR_EXT_texture_array,
		IRR_EXT_texture_buffer_object,
		IRR_EXT_texture_compression_latc,
		IRR_EXT_texture_compression_rgtc,
		IRR_EXT_texture_compression_s3tc,
		IRR_EXT_texture_cube_map,
		IRR_EXT_texture_env_add,
		IRR_EXT_texture_env_combine,
		IRR_EXT_texture_env_dot3,
		IRR_EXT_texture_filter_anisotropic,
		IRR_EXT_texture_integer,
		IRR_EXT_texture_lod_bias,
		IRR_EXT_texture_mirror_clamp,
		IRR_EXT_texture_object,
		IRR_EXT_texture_perturb_normal,
		IRR_EXT_texture_shared_exponent,
		IRR_EXT_texture_sRGB,
		IRR_EXT_timer_query,
		IRR_EXT_vertex_array,
		IRR_EXT_vertex_shader,
		IRR_EXT_vertex_weighting,
		IRR_FfdMaskSGIX,
		IRR_GREMEDY_string_marker,
		IRR_HP_convolution_border_modes,
		IRR_HP_image_transform,
		IRR_HP_occlusion_test,
		IRR_HP_texture_lighting,
		IRR_IBM_cull_vertex,
		IRR_IBM_multimode_draw_arrays,
		IRR_IBM_rasterpos_clip,
		IRR_IBM_texture_mirrored_repeat,
		IRR_IBM_vertex_array_lists,
		IRR_INGR_blend_func_separate,
		IRR_INGR_color_clamp,
		IRR_INGR_interlace_read,
		IRR_INGR_palette_buffer,
		IRR_INTEL_parallel_arrays,
		IRR_INTEL_texture_scissor,
		IRR_MESA_pack_invert,
		IRR_MESA_resize_buffers,
		IRR_MESA_window_pos,
		IRR_MESAX_texture_stack,
		IRR_MESA_ycbcr_texture,
		IRR_NV_blend_square,
		IRR_NV_copy_depth_to_color,
		IRR_NV_depth_buffer_float,
		IRR_NV_depth_clamp,
		IRR_NV_evaluators,
		IRR_NV_fence,
		IRR_NV_float_buffer,
		IRR_NV_fog_distance,
		IRR_NV_fragment_program,
		IRR_NV_fragment_program2,
		IRR_NV_fragment_program4,
		IRR_NV_fragment_program_option,
		IRR_NV_framebuffer_multisample_coverage,
		IRR_NV_geometry_program4,
		IRR_NV_geometry_shader4,
		IRR_NV_gpu_program4,
		IRR_NV_half_float,
		IRR_NV_light_max_exponent,
		IRR_NV_multisample_filter_hint,
		IRR_NV_occlusion_query,
		IRR_NV_packed_depth_stencil,
		IRR_NV_parameter_buffer_object,
		IRR_NV_pixel_data_range,
		IRR_NV_point_sprite,
		IRR_NV_primitive_restart,
		IRR_NV_register_combiners,
		IRR_NV_register_combiners2,
		IRR_NV_texgen_emboss,
		IRR_NV_texgen_reflection,
		IRR_NV_texture_compression_vtc,
		IRR_NV_texture_env_combine4,
		IRR_NV_texture_expand_normal,
		IRR_NV_texture_rectangle,
		IRR_NV_texture_shader,
		IRR_NV_texture_shader2,
		IRR_NV_texture_shader3,
		IRR_NV_transform_feedback,
		IRR_NV_vertex_array_range,
		IRR_NV_vertex_array_range2,
		IRR_NV_vertex_program,
		IRR_NV_vertex_program1_1,
		IRR_NV_vertex_program2,
		IRR_NV_vertex_program2_option,
		IRR_NV_vertex_program3,
		IRR_NV_vertex_program4,
		IRR_OES_read_format,
		IRR_OML_interlace,
		IRR_OML_resample,
		IRR_OML_subsample,
		IRR_PGI_misc_hints,
		IRR_PGI_vertex_hints,
		IRR_REND_screen_coordinates,
		IRR_S3_s3tc,
		IRR_SGI_color_matrix,
		IRR_SGI_color_table,
		IRR_SGI_depth_pass_instrument,
		IRR_SGIS_detail_texture,
		IRR_SGIS_fog_function,
		IRR_SGIS_generate_mipmap,
		IRR_SGIS_multisample,
		IRR_SGIS_pixel_texture,
		IRR_SGIS_point_line_texgen,
		IRR_SGIS_point_parameters,
		IRR_SGIS_sharpen_texture,
		IRR_SGIS_texture4D,
		IRR_SGIS_texture_border_clamp,
		IRR_SGIS_texture_color_mask,
		IRR_SGIS_texture_edge_clamp,
		IRR_SGIS_texture_filter4,
		IRR_SGIS_texture_lod,
		IRR_SGIS_texture_select,
		IRR_SGI_texture_color_table,
		IRR_SGIX_async,
		IRR_SGIX_async_histogram,
		IRR_SGIX_async_pixel,
		IRR_SGIX_blend_alpha_minmax,
		IRR_SGIX_calligraphic_fragment,
		IRR_SGIX_clipmap,
		IRR_SGIX_convolution_accuracy,
		IRR_SGIX_depth_pass_instrument,
		IRR_SGIX_depth_texture,
		IRR_SGIX_flush_raster,
		IRR_SGIX_fog_offset,
		IRR_SGIX_fog_scale,
		IRR_SGIX_fragment_lighting,
		IRR_SGIX_framezoom,
		IRR_SGIX_igloo_interface,
		IRR_SGIX_impact_pixel_texture,
		IRR_SGIX_instruments,
		IRR_SGIX_interlace,
		IRR_SGIX_ir_instrument1,
		IRR_SGIX_list_priority,
		IRR_SGIX_pixel_texture,
		IRR_SGIX_pixel_tiles,
		IRR_SGIX_polynomial_ffd,
		IRR_SGIX_reference_plane,
		IRR_SGIX_resample,
		IRR_SGIX_scalebias_hint,
		IRR_SGIX_shadow,
		IRR_SGIX_shadow_ambient,
		IRR_SGIX_sprite,
		IRR_SGIX_subsample,
		IRR_SGIX_tag_sample_buffer,
		IRR_SGIX_texture_add_env,
		IRR_SGIX_texture_coordinate_clamp,
		IRR_SGIX_texture_lod_bias,
		IRR_SGIX_texture_multi_buffer,
		IRR_SGIX_texture_scale_bias,
		IRR_SGIX_texture_select,
		IRR_SGIX_vertex_preclip,
		IRR_SGIX_ycrcb,
		IRR_SGIX_ycrcba,
		IRR_SGIX_ycrcb_subsample,
		IRR_SUN_convolution_border_modes,
		IRR_SUN_global_alpha,
		IRR_SUN_mesh_array,
		IRR_SUN_slice_accum,
		IRR_SUN_triangle_list,
		IRR_SUN_vertex,
		IRR_SUNX_constant_data,
		IRR_WIN_phong_shading,
		IRR_WIN_specular_fog,
		IRR_OpenGL_Feature_Count
	};

	public:
		// constructor
		COpenGLExtensionHandler();

		// deferred initialization
		void initExtensions(bool stencilBuffer);

	//! queries the features of the driver, returns true if feature is available
	bool queryFeature(E_VIDEO_DRIVER_FEATURE feature) const;

	// show all features with availablity
	void dump() const;

	// public access to the (loaded) extensions.
	// general functions
	void extGlActiveTextureARB(GLenum texture);
	void extGlClientActiveTextureARB(GLenum texture);
	void extGlPointParameterfARB (GLint loc, GLfloat f);
	void extGlPointParameterfvARB (GLint loc, const GLfloat *v);
	void extGlStencilFuncSeparate (GLenum frontfunc, GLenum backfunc, GLint ref, GLuint mask);
	void extGlStencilOpSeparate (GLenum face, GLenum fail, GLenum zfail, GLenum zpass);
	void extGlCompressedTexImage2D(GLenum target, GLint level,
		GLenum internalformat, GLsizei width, GLsizei height,
		GLint border, GLsizei imageSize, const void* data);

	// shader programming
	void extGlGenProgramsARB(GLsizei n, GLuint *programs);
	void extGlBindProgramARB(GLenum target, GLuint program);
	void extGlProgramStringARB(GLenum target, GLenum format, GLsizei len, const GLvoid *string);
	void extGlDeleteProgramsARB(GLsizei n, const GLuint *programs);
	void extGlProgramLocalParameter4fvARB(GLenum, GLuint, const GLfloat *);
	GLhandleARB extGlCreateShaderObjectARB(GLenum shaderType);
	void extGlShaderSourceARB(GLhandleARB shader, int numOfStrings, const char **strings, int *lenOfStrings);
	void extGlCompileShaderARB(GLhandleARB shader);
	GLhandleARB extGlCreateProgramObjectARB(void);
	void extGlAttachObjectARB(GLhandleARB program, GLhandleARB shader);
	void extGlLinkProgramARB(GLhandleARB program);
	void extGlUseProgramObjectARB(GLhandleARB prog);
	void extGlDeleteObjectARB(GLhandleARB object);
	void extGlGetInfoLogARB(GLhandleARB object, GLsizei maxLength, GLsizei *length, GLcharARB *infoLog);
	void extGlGetObjectParameterivARB(GLhandleARB object, GLenum type, int *param);
	GLint extGlGetUniformLocationARB(GLhandleARB program, const char *name);
	void extGlUniform4fvARB(GLint location, GLsizei count, const GLfloat *v);
	void extGlUniform1ivARB (GLint loc, GLsizei count, const GLint *v);
	void extGlUniform1fvARB (GLint loc, GLsizei count, const GLfloat *v);
	void extGlUniform2fvARB (GLint loc, GLsizei count, const GLfloat *v);
	void extGlUniform3fvARB (GLint loc, GLsizei count, const GLfloat *v);
	void extGlUniformMatrix2fvARB (GLint loc, GLsizei count, GLboolean transpose, const GLfloat *v);
	void extGlUniformMatrix3fvARB (GLint loc, GLsizei count, GLboolean transpose, const GLfloat *v);
	void extGlUniformMatrix4fvARB (GLint loc, GLsizei count, GLboolean transpose, const GLfloat *v);
	void extGlGetActiveUniformARB (GLhandleARB program, GLuint index, GLsizei maxlength, GLsizei *length, GLint *size, GLenum *type, GLcharARB *name);

	// framebuffer objects
	void extGlBindFramebufferEXT (GLenum target, GLuint framebuffer);
	void extGlDeleteFramebuffersEXT (GLsizei n, const GLuint *framebuffers);
	void extGlGenFramebuffersEXT (GLsizei n, GLuint *framebuffers);
	GLenum extGlCheckFramebufferStatusEXT (GLenum target);
	void extGlFramebufferTexture2DEXT (GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level);
	void extGlBindRenderbufferEXT (GLenum target, GLuint renderbuffer);
	void extGlDeleteRenderbuffersEXT (GLsizei n, const GLuint *renderbuffers);
	void extGlGenRenderbuffersEXT (GLsizei n, GLuint *renderbuffers);
	void extGlRenderbufferStorageEXT (GLenum target, GLenum internalformat, GLsizei width, GLsizei height);
	void extGlFramebufferRenderbufferEXT (GLenum target, GLenum attachment, GLenum renderbuffertarget, GLuint renderbuffer);

	// Some variables for properties
	bool StencilBuffer;
	bool MultiTextureExtension;
	bool MultiSamplingExtension;
	bool AnisotropyExtension;
	bool SeparateStencilExtension;
	bool TextureCompressionExtension;
	bool PackedDepthStencilExtension;
	bool SeparateSpecularColorExtension;

	// Some non-boolean properties
	GLint MaxTextureUnits;
	GLint MaxLights;
	GLint MaxIndices;
	f32 MaxAnisotropy;

	protected:
	// the global feature array
	bool FeatureAvailable[IRR_OpenGL_Feature_Count];

	#if defined(_IRR_OPENGL_USE_EXTPOINTER_)
		PFNGLACTIVETEXTUREARBPROC pGlActiveTextureARB;
		PFNGLCLIENTACTIVETEXTUREARBPROC	pGlClientActiveTextureARB;
		PFNGLGENPROGRAMSARBPROC pGlGenProgramsARB;
		PFNGLBINDPROGRAMARBPROC pGlBindProgramARB;
		PFNGLPROGRAMSTRINGARBPROC pGlProgramStringARB;
		PFNGLDELETEPROGRAMSNVPROC pGlDeleteProgramsARB;
		PFNGLPROGRAMLOCALPARAMETER4FVARBPROC pGlProgramLocalParameter4fvARB;
		PFNGLCREATESHADEROBJECTARBPROC pGlCreateShaderObjectARB;
		PFNGLSHADERSOURCEARBPROC pGlShaderSourceARB;
		PFNGLCOMPILESHADERARBPROC pGlCompileShaderARB;
		PFNGLCREATEPROGRAMOBJECTARBPROC pGlCreateProgramObjectARB;
		PFNGLATTACHOBJECTARBPROC pGlAttachObjectARB;
		PFNGLLINKPROGRAMARBPROC pGlLinkProgramARB;
		PFNGLUSEPROGRAMOBJECTARBPROC pGlUseProgramObjectARB;
		PFNGLDELETEOBJECTARBPROC pGlDeleteObjectARB;
		PFNGLGETINFOLOGARBPROC pGlGetInfoLogARB;
		PFNGLGETOBJECTPARAMETERIVARBPROC pGlGetObjectParameterivARB;
		PFNGLGETUNIFORMLOCATIONARBPROC pGlGetUniformLocationARB;
		PFNGLUNIFORM1IVARBPROC pGlUniform1ivARB;
		PFNGLUNIFORM1FVARBPROC pGlUniform1fvARB;
		PFNGLUNIFORM2FVARBPROC pGlUniform2fvARB;
		PFNGLUNIFORM3FVARBPROC pGlUniform3fvARB;
		PFNGLUNIFORM4FVARBPROC pGlUniform4fvARB;
		PFNGLUNIFORMMATRIX2FVARBPROC pGlUniformMatrix2fvARB;
		PFNGLUNIFORMMATRIX3FVARBPROC pGlUniformMatrix3fvARB;
		PFNGLUNIFORMMATRIX4FVARBPROC pGlUniformMatrix4fvARB;
		PFNGLGETACTIVEUNIFORMARBPROC pGlGetActiveUniformARB;
		PFNGLPOINTPARAMETERFARBPROC  pGlPointParameterfARB;
		PFNGLPOINTPARAMETERFVARBPROC pGlPointParameterfvARB;
		#ifdef GL_ATI_separate_stencil
		PFNGLSTENCILFUNCSEPARATEPROC pGlStencilFuncSeparate;
		PFNGLSTENCILOPSEPARATEPROC pGlStencilOpSeparate;
		PFNGLSTENCILFUNCSEPARATEATIPROC pGlStencilFuncSeparateATI;
		PFNGLSTENCILOPSEPARATEATIPROC pGlStencilOpSeparateATI;
		#endif
		#ifdef PFNGLCOMPRESSEDTEXIMAGE2DPROC
		PFNGLCOMPRESSEDTEXIMAGE2DPROC pGlCompressedTexImage2D;
		#endif // PFNGLCOMPRESSEDTEXIMAGE2DPROC
		#ifdef _IRR_WINDOWS_API_
		typedef BOOL (APIENTRY *PFNWGLSWAPINTERVALFARPROC)(int);
		PFNWGLSWAPINTERVALFARPROC wglSwapIntervalEXT;
		#elif defined(_IRR_LINUX_PLATFORM_) && defined(GLX_SGI_swap_control)
		PFNGLXSWAPINTERVALSGIPROC glxSwapIntervalSGI;
		#endif
		PFNGLBINDFRAMEBUFFEREXTPROC pGlBindFramebufferEXT;
		PFNGLDELETEFRAMEBUFFERSEXTPROC pGlDeleteFramebuffersEXT;
		PFNGLGENFRAMEBUFFERSEXTPROC pGlGenFramebuffersEXT;
		PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC pGlCheckFramebufferStatusEXT;
		PFNGLFRAMEBUFFERTEXTURE2DEXTPROC pGlFramebufferTexture2DEXT;
		PFNGLBINDRENDERBUFFEREXTPROC pGlBindRenderbufferEXT;
		PFNGLDELETERENDERBUFFERSEXTPROC pGlDeleteRenderbuffersEXT;
		PFNGLGENRENDERBUFFERSEXTPROC pGlGenRenderbuffersEXT;
		PFNGLRENDERBUFFERSTORAGEEXTPROC pGlRenderbufferStorageEXT;
		PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC pGlFramebufferRenderbufferEXT;
	#endif
};

}
}

#endif