/*
    This file is part of Magnum.

    Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019
              Vladimír Vondruš <mosra@centrum.cz>

    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
    to deal in the Software without restriction, including without limitation
    the rights to use, copy, modify, merge, publish, distribute, sublicense,
    and/or sell copies of the Software, and to permit persons to whom the
    Software is furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included
    in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    DEALINGS IN THE SOFTWARE.
*/

#include "flextGL.h"

#include <cstdio>
#include <cstdlib>

#include "Magnum/Platform/Implementation/OpenGLFunctionLoader.h"

void flextGLInit(Magnum::GL::Context&) {
    Magnum::Platform::Implementation::OpenGLFunctionLoader loader;

    /* GL_ANGLE_framebuffer_blit */
    flextglBlitFramebufferANGLE = reinterpret_cast<void(APIENTRY*)(GLint, GLint, GLint, GLint, GLint, GLint, GLint, GLint, GLbitfield, GLenum)>(loader.load("glBlitFramebufferANGLE"));

    /* GL_ANGLE_framebuffer_multisample */
    flextglRenderbufferStorageMultisampleANGLE = reinterpret_cast<void(APIENTRY*)(GLenum, GLsizei, GLenum, GLsizei, GLsizei)>(loader.load("glRenderbufferStorageMultisampleANGLE"));

    /* GL_ANGLE_instanced_arrays */
    flextglDrawArraysInstancedANGLE = reinterpret_cast<void(APIENTRY*)(GLenum, GLint, GLsizei, GLsizei)>(loader.load("glDrawArraysInstancedANGLE"));
    flextglDrawElementsInstancedANGLE = reinterpret_cast<void(APIENTRY*)(GLenum, GLsizei, GLenum, const void *, GLsizei)>(loader.load("glDrawElementsInstancedANGLE"));
    flextglVertexAttribDivisorANGLE = reinterpret_cast<void(APIENTRY*)(GLuint, GLuint)>(loader.load("glVertexAttribDivisorANGLE"));

    /* GL_APPLE_framebuffer_multisample */
    flextglRenderbufferStorageMultisampleAPPLE = reinterpret_cast<void(APIENTRY*)(GLenum, GLsizei, GLenum, GLsizei, GLsizei)>(loader.load("glRenderbufferStorageMultisampleAPPLE"));
    flextglResolveMultisampleFramebufferAPPLE = reinterpret_cast<void(APIENTRY*)(void)>(loader.load("glResolveMultisampleFramebufferAPPLE"));

    /* GL_EXT_debug_label */
    flextglGetObjectLabelEXT = reinterpret_cast<void(APIENTRY*)(GLenum, GLuint, GLsizei, GLsizei *, GLchar *)>(loader.load("glGetObjectLabelEXT"));
    flextglLabelObjectEXT = reinterpret_cast<void(APIENTRY*)(GLenum, GLuint, GLsizei, const GLchar *)>(loader.load("glLabelObjectEXT"));

    /* GL_EXT_debug_marker */
    flextglInsertEventMarkerEXT = reinterpret_cast<void(APIENTRY*)(GLsizei, const GLchar *)>(loader.load("glInsertEventMarkerEXT"));
    flextglPopGroupMarkerEXT = reinterpret_cast<void(APIENTRY*)(void)>(loader.load("glPopGroupMarkerEXT"));
    flextglPushGroupMarkerEXT = reinterpret_cast<void(APIENTRY*)(GLsizei, const GLchar *)>(loader.load("glPushGroupMarkerEXT"));

    /* GL_EXT_discard_framebuffer */
    flextglDiscardFramebufferEXT = reinterpret_cast<void(APIENTRY*)(GLenum, GLsizei, const GLenum *)>(loader.load("glDiscardFramebufferEXT"));

    /* GL_EXT_disjoint_timer_query */
    flextglGetInteger64vEXT = reinterpret_cast<void(APIENTRY*)(GLenum, GLint64 *)>(loader.load("glGetInteger64vEXT"));
    flextglGetQueryObjecti64vEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLenum, GLint64 *)>(loader.load("glGetQueryObjecti64vEXT"));
    flextglGetQueryObjectivEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLenum, GLint *)>(loader.load("glGetQueryObjectivEXT"));
    flextglGetQueryObjectui64vEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLenum, GLuint64 *)>(loader.load("glGetQueryObjectui64vEXT"));
    flextglQueryCounterEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLenum)>(loader.load("glQueryCounterEXT"));

    /* GL_EXT_draw_buffers */
    flextglDrawBuffersEXT = reinterpret_cast<void(APIENTRY*)(GLsizei, const GLenum *)>(loader.load("glDrawBuffersEXT"));

    /* GL_EXT_draw_buffers_indexed */
    flextglBlendEquationSeparateiEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLenum, GLenum)>(loader.load("glBlendEquationSeparateiEXT"));
    flextglBlendEquationiEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLenum)>(loader.load("glBlendEquationiEXT"));
    flextglBlendFuncSeparateiEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLenum, GLenum, GLenum, GLenum)>(loader.load("glBlendFuncSeparateiEXT"));
    flextglBlendFunciEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLenum, GLenum)>(loader.load("glBlendFunciEXT"));
    flextglColorMaskiEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLboolean, GLboolean, GLboolean, GLboolean)>(loader.load("glColorMaskiEXT"));
    flextglDisableiEXT = reinterpret_cast<void(APIENTRY*)(GLenum, GLuint)>(loader.load("glDisableiEXT"));
    flextglEnableiEXT = reinterpret_cast<void(APIENTRY*)(GLenum, GLuint)>(loader.load("glEnableiEXT"));
    flextglIsEnablediEXT = reinterpret_cast<GLboolean(APIENTRY*)(GLenum, GLuint)>(loader.load("glIsEnablediEXT"));

    /* GL_EXT_instanced_arrays */
    flextglDrawArraysInstancedEXT = reinterpret_cast<void(APIENTRY*)(GLenum, GLint, GLsizei, GLsizei)>(loader.load("glDrawArraysInstancedEXT"));
    flextglDrawElementsInstancedEXT = reinterpret_cast<void(APIENTRY*)(GLenum, GLsizei, GLenum, const void *, GLsizei)>(loader.load("glDrawElementsInstancedEXT"));
    flextglVertexAttribDivisorEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLuint)>(loader.load("glVertexAttribDivisorEXT"));

    /* GL_EXT_map_buffer_range */
    flextglFlushMappedBufferRangeEXT = reinterpret_cast<void(APIENTRY*)(GLenum, GLintptr, GLsizeiptr)>(loader.load("glFlushMappedBufferRangeEXT"));
    flextglMapBufferRangeEXT = reinterpret_cast<void *(APIENTRY*)(GLenum, GLintptr, GLsizeiptr, GLbitfield)>(loader.load("glMapBufferRangeEXT"));

    /* GL_EXT_multi_draw_arrays */
    flextglMultiDrawArraysEXT = reinterpret_cast<void(APIENTRY*)(GLenum, const GLint *, const GLsizei *, GLsizei)>(loader.load("glMultiDrawArraysEXT"));
    flextglMultiDrawElementsEXT = reinterpret_cast<void(APIENTRY*)(GLenum, const GLsizei *, GLenum, const void *const*, GLsizei)>(loader.load("glMultiDrawElementsEXT"));

    /* GL_EXT_multisampled_render_to_texture */
    flextglFramebufferTexture2DMultisampleEXT = reinterpret_cast<void(APIENTRY*)(GLenum, GLenum, GLenum, GLuint, GLint, GLsizei)>(loader.load("glFramebufferTexture2DMultisampleEXT"));
    flextglRenderbufferStorageMultisampleEXT = reinterpret_cast<void(APIENTRY*)(GLenum, GLsizei, GLenum, GLsizei, GLsizei)>(loader.load("glRenderbufferStorageMultisampleEXT"));

    /* GL_EXT_occlusion_query_boolean */
    flextglBeginQueryEXT = reinterpret_cast<void(APIENTRY*)(GLenum, GLuint)>(loader.load("glBeginQueryEXT"));
    flextglDeleteQueriesEXT = reinterpret_cast<void(APIENTRY*)(GLsizei, const GLuint *)>(loader.load("glDeleteQueriesEXT"));
    flextglEndQueryEXT = reinterpret_cast<void(APIENTRY*)(GLenum)>(loader.load("glEndQueryEXT"));
    flextglGenQueriesEXT = reinterpret_cast<void(APIENTRY*)(GLsizei, GLuint *)>(loader.load("glGenQueriesEXT"));
    flextglGetQueryObjectuivEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLenum, GLuint *)>(loader.load("glGetQueryObjectuivEXT"));
    flextglGetQueryivEXT = reinterpret_cast<void(APIENTRY*)(GLenum, GLenum, GLint *)>(loader.load("glGetQueryivEXT"));
    flextglIsQueryEXT = reinterpret_cast<GLboolean(APIENTRY*)(GLuint)>(loader.load("glIsQueryEXT"));

    /* GL_EXT_polygon_offset_clamp */
    flextglPolygonOffsetClampEXT = reinterpret_cast<void(APIENTRY*)(GLfloat, GLfloat, GLfloat)>(loader.load("glPolygonOffsetClampEXT"));

    /* GL_EXT_robustness */
    flextglGetGraphicsResetStatusEXT = reinterpret_cast<GLenum(APIENTRY*)(void)>(loader.load("glGetGraphicsResetStatusEXT"));
    flextglGetnUniformfvEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLint, GLsizei, GLfloat *)>(loader.load("glGetnUniformfvEXT"));
    flextglGetnUniformivEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLint, GLsizei, GLint *)>(loader.load("glGetnUniformivEXT"));
    flextglReadnPixelsEXT = reinterpret_cast<void(APIENTRY*)(GLint, GLint, GLsizei, GLsizei, GLenum, GLenum, GLsizei, void *)>(loader.load("glReadnPixelsEXT"));

    /* GL_EXT_separate_shader_objects */
    flextglActiveShaderProgramEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLuint)>(loader.load("glActiveShaderProgramEXT"));
    flextglBindProgramPipelineEXT = reinterpret_cast<void(APIENTRY*)(GLuint)>(loader.load("glBindProgramPipelineEXT"));
    flextglCreateShaderProgramvEXT = reinterpret_cast<GLuint(APIENTRY*)(GLenum, GLsizei, const GLchar **)>(loader.load("glCreateShaderProgramvEXT"));
    flextglDeleteProgramPipelinesEXT = reinterpret_cast<void(APIENTRY*)(GLsizei, const GLuint *)>(loader.load("glDeleteProgramPipelinesEXT"));
    flextglGenProgramPipelinesEXT = reinterpret_cast<void(APIENTRY*)(GLsizei, GLuint *)>(loader.load("glGenProgramPipelinesEXT"));
    flextglGetProgramPipelineInfoLogEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLsizei, GLsizei *, GLchar *)>(loader.load("glGetProgramPipelineInfoLogEXT"));
    flextglGetProgramPipelineivEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLenum, GLint *)>(loader.load("glGetProgramPipelineivEXT"));
    flextglIsProgramPipelineEXT = reinterpret_cast<GLboolean(APIENTRY*)(GLuint)>(loader.load("glIsProgramPipelineEXT"));
    flextglProgramParameteriEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLenum, GLint)>(loader.load("glProgramParameteriEXT"));
    flextglProgramUniform1fEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLint, GLfloat)>(loader.load("glProgramUniform1fEXT"));
    flextglProgramUniform1fvEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLint, GLsizei, const GLfloat *)>(loader.load("glProgramUniform1fvEXT"));
    flextglProgramUniform1iEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLint, GLint)>(loader.load("glProgramUniform1iEXT"));
    flextglProgramUniform1ivEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLint, GLsizei, const GLint *)>(loader.load("glProgramUniform1ivEXT"));
    flextglProgramUniform2fEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLint, GLfloat, GLfloat)>(loader.load("glProgramUniform2fEXT"));
    flextglProgramUniform2fvEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLint, GLsizei, const GLfloat *)>(loader.load("glProgramUniform2fvEXT"));
    flextglProgramUniform2iEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLint, GLint, GLint)>(loader.load("glProgramUniform2iEXT"));
    flextglProgramUniform2ivEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLint, GLsizei, const GLint *)>(loader.load("glProgramUniform2ivEXT"));
    flextglProgramUniform3fEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLint, GLfloat, GLfloat, GLfloat)>(loader.load("glProgramUniform3fEXT"));
    flextglProgramUniform3fvEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLint, GLsizei, const GLfloat *)>(loader.load("glProgramUniform3fvEXT"));
    flextglProgramUniform3iEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLint, GLint, GLint, GLint)>(loader.load("glProgramUniform3iEXT"));
    flextglProgramUniform3ivEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLint, GLsizei, const GLint *)>(loader.load("glProgramUniform3ivEXT"));
    flextglProgramUniform4fEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLint, GLfloat, GLfloat, GLfloat, GLfloat)>(loader.load("glProgramUniform4fEXT"));
    flextglProgramUniform4fvEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLint, GLsizei, const GLfloat *)>(loader.load("glProgramUniform4fvEXT"));
    flextglProgramUniform4iEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLint, GLint, GLint, GLint, GLint)>(loader.load("glProgramUniform4iEXT"));
    flextglProgramUniform4ivEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLint, GLsizei, const GLint *)>(loader.load("glProgramUniform4ivEXT"));
    flextglProgramUniformMatrix2fvEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLint, GLsizei, GLboolean, const GLfloat *)>(loader.load("glProgramUniformMatrix2fvEXT"));
    flextglProgramUniformMatrix3fvEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLint, GLsizei, GLboolean, const GLfloat *)>(loader.load("glProgramUniformMatrix3fvEXT"));
    flextglProgramUniformMatrix4fvEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLint, GLsizei, GLboolean, const GLfloat *)>(loader.load("glProgramUniformMatrix4fvEXT"));
    flextglUseProgramStagesEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLbitfield, GLuint)>(loader.load("glUseProgramStagesEXT"));
    flextglValidateProgramPipelineEXT = reinterpret_cast<void(APIENTRY*)(GLuint)>(loader.load("glValidateProgramPipelineEXT"));

    /* GL_EXT_texture_border_clamp */
    flextglGetSamplerParameterIivEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLenum, GLint *)>(loader.load("glGetSamplerParameterIivEXT"));
    flextglGetSamplerParameterIuivEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLenum, GLuint *)>(loader.load("glGetSamplerParameterIuivEXT"));
    flextglGetTexParameterIivEXT = reinterpret_cast<void(APIENTRY*)(GLenum, GLenum, GLint *)>(loader.load("glGetTexParameterIivEXT"));
    flextglGetTexParameterIuivEXT = reinterpret_cast<void(APIENTRY*)(GLenum, GLenum, GLuint *)>(loader.load("glGetTexParameterIuivEXT"));
    flextglSamplerParameterIivEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLenum, const GLint *)>(loader.load("glSamplerParameterIivEXT"));
    flextglSamplerParameterIuivEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLenum, const GLuint *)>(loader.load("glSamplerParameterIuivEXT"));
    flextglTexParameterIivEXT = reinterpret_cast<void(APIENTRY*)(GLenum, GLenum, const GLint *)>(loader.load("glTexParameterIivEXT"));
    flextglTexParameterIuivEXT = reinterpret_cast<void(APIENTRY*)(GLenum, GLenum, const GLuint *)>(loader.load("glTexParameterIuivEXT"));

    /* GL_EXT_texture_storage */
    flextglTexStorage2DEXT = reinterpret_cast<void(APIENTRY*)(GLenum, GLsizei, GLenum, GLsizei, GLsizei)>(loader.load("glTexStorage2DEXT"));
    flextglTexStorage3DEXT = reinterpret_cast<void(APIENTRY*)(GLenum, GLsizei, GLenum, GLsizei, GLsizei, GLsizei)>(loader.load("glTexStorage3DEXT"));

    /* GL_KHR_blend_equation_advanced */
    flextglBlendBarrierKHR = reinterpret_cast<void(APIENTRY*)(void)>(loader.load("glBlendBarrierKHR"));

    /* GL_KHR_debug */
    flextglDebugMessageCallbackKHR = reinterpret_cast<void(APIENTRY*)(GLDEBUGPROCKHR, const void *)>(loader.load("glDebugMessageCallbackKHR"));
    flextglDebugMessageControlKHR = reinterpret_cast<void(APIENTRY*)(GLenum, GLenum, GLenum, GLsizei, const GLuint *, GLboolean)>(loader.load("glDebugMessageControlKHR"));
    flextglDebugMessageInsertKHR = reinterpret_cast<void(APIENTRY*)(GLenum, GLenum, GLuint, GLenum, GLsizei, const GLchar *)>(loader.load("glDebugMessageInsertKHR"));
    flextglGetDebugMessageLogKHR = reinterpret_cast<GLuint(APIENTRY*)(GLuint, GLsizei, GLenum *, GLenum *, GLuint *, GLenum *, GLsizei *, GLchar *)>(loader.load("glGetDebugMessageLogKHR"));
    flextglGetObjectLabelKHR = reinterpret_cast<void(APIENTRY*)(GLenum, GLuint, GLsizei, GLsizei *, GLchar *)>(loader.load("glGetObjectLabelKHR"));
    flextglGetObjectPtrLabelKHR = reinterpret_cast<void(APIENTRY*)(const void *, GLsizei, GLsizei *, GLchar *)>(loader.load("glGetObjectPtrLabelKHR"));
    flextglGetPointervKHR = reinterpret_cast<void(APIENTRY*)(GLenum, void **)>(loader.load("glGetPointervKHR"));
    flextglObjectLabelKHR = reinterpret_cast<void(APIENTRY*)(GLenum, GLuint, GLsizei, const GLchar *)>(loader.load("glObjectLabelKHR"));
    flextglObjectPtrLabelKHR = reinterpret_cast<void(APIENTRY*)(const void *, GLsizei, const GLchar *)>(loader.load("glObjectPtrLabelKHR"));
    flextglPopDebugGroupKHR = reinterpret_cast<void(APIENTRY*)(void)>(loader.load("glPopDebugGroupKHR"));
    flextglPushDebugGroupKHR = reinterpret_cast<void(APIENTRY*)(GLenum, GLuint, GLsizei, const GLchar *)>(loader.load("glPushDebugGroupKHR"));

    /* GL_KHR_robustness */
    flextglGetGraphicsResetStatusKHR = reinterpret_cast<GLenum(APIENTRY*)(void)>(loader.load("glGetGraphicsResetStatusKHR"));
    flextglGetnUniformfvKHR = reinterpret_cast<void(APIENTRY*)(GLuint, GLint, GLsizei, GLfloat *)>(loader.load("glGetnUniformfvKHR"));
    flextglGetnUniformivKHR = reinterpret_cast<void(APIENTRY*)(GLuint, GLint, GLsizei, GLint *)>(loader.load("glGetnUniformivKHR"));
    flextglGetnUniformuivKHR = reinterpret_cast<void(APIENTRY*)(GLuint, GLint, GLsizei, GLuint *)>(loader.load("glGetnUniformuivKHR"));
    flextglReadnPixelsKHR = reinterpret_cast<void(APIENTRY*)(GLint, GLint, GLsizei, GLsizei, GLenum, GLenum, GLsizei, void *)>(loader.load("glReadnPixelsKHR"));

    /* GL_NV_draw_buffers */
    flextglDrawBuffersNV = reinterpret_cast<void(APIENTRY*)(GLsizei, const GLenum *)>(loader.load("glDrawBuffersNV"));

    /* GL_NV_draw_instanced */
    flextglDrawArraysInstancedNV = reinterpret_cast<void(APIENTRY*)(GLenum, GLint, GLsizei, GLsizei)>(loader.load("glDrawArraysInstancedNV"));
    flextglDrawElementsInstancedNV = reinterpret_cast<void(APIENTRY*)(GLenum, GLsizei, GLenum, const void *, GLsizei)>(loader.load("glDrawElementsInstancedNV"));

    /* GL_NV_framebuffer_blit */
    flextglBlitFramebufferNV = reinterpret_cast<void(APIENTRY*)(GLint, GLint, GLint, GLint, GLint, GLint, GLint, GLint, GLbitfield, GLenum)>(loader.load("glBlitFramebufferNV"));

    /* GL_NV_framebuffer_multisample */
    flextglRenderbufferStorageMultisampleNV = reinterpret_cast<void(APIENTRY*)(GLenum, GLsizei, GLenum, GLsizei, GLsizei)>(loader.load("glRenderbufferStorageMultisampleNV"));

    /* GL_NV_instanced_arrays */
    flextglVertexAttribDivisorNV = reinterpret_cast<void(APIENTRY*)(GLuint, GLuint)>(loader.load("glVertexAttribDivisorNV"));

    /* GL_NV_polygon_mode */
    flextglPolygonModeNV = reinterpret_cast<void(APIENTRY*)(GLenum, GLenum)>(loader.load("glPolygonModeNV"));

    /* GL_NV_read_buffer */
    flextglReadBufferNV = reinterpret_cast<void(APIENTRY*)(GLenum)>(loader.load("glReadBufferNV"));

    /* GL_OES_mapbuffer */
    flextglGetBufferPointervOES = reinterpret_cast<void(APIENTRY*)(GLenum, GLenum, void **)>(loader.load("glGetBufferPointervOES"));
    flextglMapBufferOES = reinterpret_cast<void *(APIENTRY*)(GLenum, GLenum)>(loader.load("glMapBufferOES"));
    flextglUnmapBufferOES = reinterpret_cast<GLboolean(APIENTRY*)(GLenum)>(loader.load("glUnmapBufferOES"));

    /* GL_OES_texture_3D */
    flextglCompressedTexImage3DOES = reinterpret_cast<void(APIENTRY*)(GLenum, GLint, GLenum, GLsizei, GLsizei, GLsizei, GLint, GLsizei, const void *)>(loader.load("glCompressedTexImage3DOES"));
    flextglCompressedTexSubImage3DOES = reinterpret_cast<void(APIENTRY*)(GLenum, GLint, GLint, GLint, GLint, GLsizei, GLsizei, GLsizei, GLenum, GLsizei, const void *)>(loader.load("glCompressedTexSubImage3DOES"));
    flextglCopyTexSubImage3DOES = reinterpret_cast<void(APIENTRY*)(GLenum, GLint, GLint, GLint, GLint, GLint, GLint, GLsizei, GLsizei)>(loader.load("glCopyTexSubImage3DOES"));
    flextglFramebufferTexture3DOES = reinterpret_cast<void(APIENTRY*)(GLenum, GLenum, GLenum, GLuint, GLint, GLint)>(loader.load("glFramebufferTexture3DOES"));
    flextglTexImage3DOES = reinterpret_cast<void(APIENTRY*)(GLenum, GLint, GLenum, GLsizei, GLsizei, GLsizei, GLint, GLenum, GLenum, const void *)>(loader.load("glTexImage3DOES"));
    flextglTexSubImage3DOES = reinterpret_cast<void(APIENTRY*)(GLenum, GLint, GLint, GLint, GLint, GLsizei, GLsizei, GLsizei, GLenum, GLenum, const void *)>(loader.load("glTexSubImage3DOES"));

    /* GL_OES_vertex_array_object */
    flextglBindVertexArrayOES = reinterpret_cast<void(APIENTRY*)(GLuint)>(loader.load("glBindVertexArrayOES"));
    flextglDeleteVertexArraysOES = reinterpret_cast<void(APIENTRY*)(GLsizei, const GLuint *)>(loader.load("glDeleteVertexArraysOES"));
    flextglGenVertexArraysOES = reinterpret_cast<void(APIENTRY*)(GLsizei, GLuint *)>(loader.load("glGenVertexArraysOES"));
    flextglIsVertexArrayOES = reinterpret_cast<GLboolean(APIENTRY*)(GLuint)>(loader.load("glIsVertexArrayOES"));
}