+#define GL_MULTISAMPLE 0x809D
+#define GL_SAMPLE_ALPHA_TO_COVERAGE 0x809E
+#define GL_SAMPLE_ALPHA_TO_ONE 0x809F
+#define GL_SAMPLE_COVERAGE 0x80A0
+#define GL_SAMPLE_BUFFERS 0x80A8
+#define GL_SAMPLES 0x80A9
+#define GL_SAMPLE_COVERAGE_VALUE 0x80AA
+#define GL_SAMPLE_COVERAGE_INVERT 0x80AB
+#define GL_MULTISAMPLE_BIT 0x20000000
+
+#define GL_DEPTH_STENCIL 0x84F9
+#define GL_UNSIGNED_INT_24_8 0x84FA
+#define GL_DEPTH24_STENCIL8 0x88F0
+
+#define GL_BLEND_DST_RGB 0x80C8
+#define GL_BLEND_SRC_RGB 0x80C9
+#define GL_BLEND_DST_ALPHA 0x80CA
+#define GL_BLEND_SRC_ALPHA 0x80CB
+
+#define GL_DEBUG_OUTPUT_SYNCHRONOUS_ARB 0x8242
+#define GL_DEBUG_NEXT_LOGGED_MESSAGE_LENGTH_ARB 0x8243
+#define GL_DEBUG_CALLBACK_FUNCTION_ARB 0x8244
+#define GL_DEBUG_CALLBACK_USER_PARAM_ARB 0x8245
+#define GL_DEBUG_SOURCE_API_ARB 0x8246
+#define GL_DEBUG_SOURCE_WINDOW_SYSTEM_ARB 0x8247
+#define GL_DEBUG_SOURCE_SHADER_COMPILER_ARB 0x8248
+#define GL_DEBUG_SOURCE_THIRD_PARTY_ARB 0x8249
+#define GL_DEBUG_SOURCE_APPLICATION_ARB 0x824A
+#define GL_DEBUG_SOURCE_OTHER_ARB 0x824B
+#define GL_DEBUG_TYPE_ERROR_ARB 0x824C
+#define GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR_ARB 0x824D
+#define GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR_ARB 0x824E
+#define GL_DEBUG_TYPE_PORTABILITY_ARB 0x824F
+#define GL_DEBUG_TYPE_PERFORMANCE_ARB 0x8250
+#define GL_DEBUG_TYPE_OTHER_ARB 0x8251
+#define GL_MAX_DEBUG_MESSAGE_LENGTH_ARB 0x9143
+#define GL_MAX_DEBUG_LOGGED_MESSAGES_ARB 0x9144
+#define GL_DEBUG_LOGGED_MESSAGES_ARB 0x9145
+#define GL_DEBUG_SEVERITY_HIGH_ARB 0x9146
+#define GL_DEBUG_SEVERITY_MEDIUM_ARB 0x9147
+#define GL_DEBUG_SEVERITY_LOW_ARB 0x9148
+
+#endif //GL_ZERO
+
+extern GLboolean(GLAPIENTRY *qglIsBuffer) (GLuint buffer);
+extern GLboolean(GLAPIENTRY *qglIsEnabled)(GLenum cap);
+extern GLboolean(GLAPIENTRY *qglIsFramebuffer)(GLuint framebuffer);
+extern GLboolean(GLAPIENTRY *qglIsQuery)(GLuint qid);
+extern GLboolean(GLAPIENTRY *qglIsRenderbuffer)(GLuint renderbuffer);
+extern GLboolean(GLAPIENTRY *qglUnmapBuffer) (GLenum target);
+extern GLenum(GLAPIENTRY *qglCheckFramebufferStatus)(GLenum target);
+extern GLenum(GLAPIENTRY *qglGetError)(void);
+extern GLint(GLAPIENTRY *qglGetAttribLocation)(GLuint programObj, const GLchar *name);
+extern GLint(GLAPIENTRY *qglGetUniformLocation)(GLuint programObj, const GLchar *name);
+extern GLuint(GLAPIENTRY *qglCreateProgram)(void);
+extern GLuint(GLAPIENTRY *qglCreateShader)(GLenum shaderType);
+extern GLuint(GLAPIENTRY *qglGetDebugMessageLogARB)(GLuint count, GLsizei bufSize, GLenum* sources, GLenum* types, GLuint* ids, GLenum* severities, GLsizei* lengths, GLchar* messageLog);
+extern GLuint(GLAPIENTRY *qglGetUniformBlockIndex)(GLuint program, const char* uniformBlockName);
+extern GLvoid(GLAPIENTRY *qglBindFramebuffer)(GLenum target, GLuint framebuffer);
+extern GLvoid(GLAPIENTRY *qglBindRenderbuffer)(GLenum target, GLuint renderbuffer);
+extern GLvoid(GLAPIENTRY *qglBlitFramebuffer)(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1, GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1, GLbitfield mask, GLenum filter);
+extern GLvoid(GLAPIENTRY *qglDeleteFramebuffers)(GLsizei n, const GLuint *framebuffers);
+extern GLvoid(GLAPIENTRY *qglDeleteRenderbuffers)(GLsizei n, const GLuint *renderbuffers);
+extern GLvoid(GLAPIENTRY *qglFramebufferRenderbuffer)(GLenum target, GLenum attachment, GLenum renderbuffertarget, GLuint renderbuffer);
+extern GLvoid(GLAPIENTRY *qglFramebufferTexture1D)(GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level);
+extern GLvoid(GLAPIENTRY *qglFramebufferTexture2D)(GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level);
+extern GLvoid(GLAPIENTRY *qglFramebufferTexture3D)(GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level, GLint layer);
+extern GLvoid(GLAPIENTRY *qglFramebufferTextureLayer)(GLenum target, GLenum attachment, GLuint texture, GLint level, GLint layer);
+extern GLvoid(GLAPIENTRY *qglGenFramebuffers)(GLsizei n, GLuint *framebuffers);
+extern GLvoid(GLAPIENTRY *qglGenRenderbuffers)(GLsizei n, GLuint *renderbuffers);
+extern GLvoid(GLAPIENTRY *qglGenerateMipmap)(GLenum target);
+extern GLvoid(GLAPIENTRY *qglGetFramebufferAttachmentParameteriv)(GLenum target, GLenum attachment, GLenum pname, GLint *params);
+extern GLvoid(GLAPIENTRY *qglGetRenderbufferParameteriv)(GLenum target, GLenum pname, GLint *params);
+extern GLvoid(GLAPIENTRY *qglRenderbufferStorage)(GLenum target, GLenum internalformat, GLsizei width, GLsizei height);
+extern GLvoid(GLAPIENTRY *qglRenderbufferStorageMultisample)(GLenum target, GLsizei samples, GLenum internalformat, GLsizei width, GLsizei height);
+extern GLvoid* (GLAPIENTRY *qglMapBuffer) (GLenum target, GLenum access);
+extern const GLubyte* (GLAPIENTRY *qglGetString)(GLenum name);
+extern void (GLAPIENTRY *qglActiveTexture)(GLenum texture);
+extern void (GLAPIENTRY *qglAttachShader)(GLuint containerObj, GLuint obj);
+extern void (GLAPIENTRY *qglBeginQuery)(GLenum target, GLuint qid);
+extern void (GLAPIENTRY *qglBindAttribLocation)(GLuint programObj, GLuint index, const GLchar *name);
+extern void (GLAPIENTRY *qglBindBuffer) (GLenum target, GLuint buffer);
+extern void (GLAPIENTRY *qglBindBufferBase)(GLenum target, GLuint index, GLuint buffer);
+extern void (GLAPIENTRY *qglBindBufferRange)(GLenum target, GLuint index, GLuint buffer, GLintptr offset, GLsizeiptr size);
+extern void (GLAPIENTRY *qglBindFragDataLocation)(GLuint programObj, GLuint index, const GLchar *name);
+extern void (GLAPIENTRY *qglBindTexture)(GLenum target, GLuint texture);
+extern void (GLAPIENTRY *qglBindVertexArray)(GLuint array);
+extern void (GLAPIENTRY *qglBlendEquation)(GLenum); // also supplied by GL_blend_subtract
+extern void (GLAPIENTRY *qglBlendFunc)(GLenum sfactor, GLenum dfactor);
+extern void (GLAPIENTRY *qglBlendFuncSeparate)(GLenum sfactorRGB, GLenum dfactorRGB, GLenum sfactorAlpha, GLenum dfactorAlpha);
+extern void (GLAPIENTRY *qglBufferData) (GLenum target, GLsizeiptr size, const GLvoid *data, GLenum usage);
+extern void (GLAPIENTRY *qglBufferSubData) (GLenum target, GLintptr offset, GLsizeiptr size, const GLvoid *data);
+extern void (GLAPIENTRY *qglClear)(GLbitfield mask);
+extern void (GLAPIENTRY *qglClearColor)(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha);
+extern void (GLAPIENTRY *qglClearDepth)(GLclampd depth);
+extern void (GLAPIENTRY *qglClearStencil)(GLint s);
+extern void (GLAPIENTRY *qglColorMask)(GLboolean red, GLboolean green, GLboolean blue, GLboolean alpha);
+extern void (GLAPIENTRY *qglCompileShader)(GLuint shaderObj);
+extern void (GLAPIENTRY *qglCompressedTexImage2D)(GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLint border, GLsizei imageSize, const void *data);
+extern void (GLAPIENTRY *qglCompressedTexImage3D)(GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLsizei depth, GLint border, GLsizei imageSize, const void *data);
+extern void (GLAPIENTRY *qglCompressedTexSubImage2D)(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLsizei imageSize, const void *data);
+extern void (GLAPIENTRY *qglCompressedTexSubImage3D)(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLsizei imageSize, const void *data);
+extern void (GLAPIENTRY *qglCopyTexImage2D)(GLenum target, GLint level, GLenum internalformat, GLint x, GLint y, GLsizei width, GLsizei height, GLint border);
+extern void (GLAPIENTRY *qglCopyTexSubImage2D)(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint x, GLint y, GLsizei width, GLsizei height);
+extern void (GLAPIENTRY *qglCopyTexSubImage3D)(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLint x, GLint y, GLsizei width, GLsizei height);
+extern void (GLAPIENTRY *qglCullFace)(GLenum mode);
+extern void (GLAPIENTRY *qglDebugMessageCallbackARB)(GLDEBUGPROCARB callback, const GLvoid* userParam);
+extern void (GLAPIENTRY *qglDebugMessageControlARB)(GLenum source, GLenum type, GLenum severity, GLsizei count, const GLuint* ids, GLboolean enabled);
+extern void (GLAPIENTRY *qglDebugMessageInsertARB)(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar* buf);
+extern void (GLAPIENTRY *qglDeleteBuffers) (GLsizei n, const GLuint *buffers);
+extern void (GLAPIENTRY *qglDeleteProgram)(GLuint obj);
+extern void (GLAPIENTRY *qglDeleteQueries)(GLsizei n, const GLuint *ids);
+extern void (GLAPIENTRY *qglDeleteShader)(GLuint obj);
+extern void (GLAPIENTRY *qglDeleteTextures)(GLsizei n, const GLuint *textures);
+extern void (GLAPIENTRY *qglDeleteVertexArrays)(GLsizei n, const GLuint *arrays);
+extern void (GLAPIENTRY *qglDepthFunc)(GLenum func);
+extern void (GLAPIENTRY *qglDepthMask)(GLboolean flag);
+extern void (GLAPIENTRY *qglDepthRange)(GLclampd near_val, GLclampd far_val);
+extern void (GLAPIENTRY *qglDepthRangef)(GLclampf near_val, GLclampf far_val);
+extern void (GLAPIENTRY *qglDetachShader)(GLuint containerObj, GLuint attachedObj);
+extern void (GLAPIENTRY *qglDisable)(GLenum cap);
+extern void (GLAPIENTRY *qglDisableVertexAttribArray)(GLuint index);
+extern void (GLAPIENTRY *qglDrawArrays)(GLenum mode, GLint first, GLsizei count);
+extern void (GLAPIENTRY *qglDrawBuffer)(GLenum mode);
+extern void (GLAPIENTRY *qglDrawBuffers)(GLsizei n, const GLenum *bufs);
+extern void (GLAPIENTRY *qglDrawElements)(GLenum mode, GLsizei count, GLenum type, const GLvoid *indices);
+extern void (GLAPIENTRY *qglEnable)(GLenum cap);
+extern void (GLAPIENTRY *qglEnableVertexAttribArray)(GLuint index);
+extern void (GLAPIENTRY *qglEndQuery)(GLenum target);
+extern void (GLAPIENTRY *qglFinish)(void);
+extern void (GLAPIENTRY *qglFlush)(void);
+extern void (GLAPIENTRY *qglGenBuffers) (GLsizei n, GLuint *buffers);
+extern void (GLAPIENTRY *qglGenQueries)(GLsizei n, GLuint *ids);
+extern void (GLAPIENTRY *qglGenTextures)(GLsizei n, GLuint *textures);
+extern void (GLAPIENTRY *qglGenVertexArrays)(GLsizei n, GLuint *arrays);
+extern void (GLAPIENTRY *qglGetActiveAttrib)(GLuint programObj, GLuint index, GLsizei maxLength, GLsizei *length, GLint *size, GLenum *type, GLchar *name);
+extern void (GLAPIENTRY *qglGetActiveUniform)(GLuint programObj, GLuint index, GLsizei maxLength, GLsizei *length, GLint *size, GLenum *type, GLchar *name);
+extern void (GLAPIENTRY *qglGetActiveUniformBlockName)(GLuint program, GLuint uniformBlockIndex, GLsizei bufSize, GLsizei* length, char* uniformBlockName);
+extern void (GLAPIENTRY *qglGetActiveUniformBlockiv)(GLuint program, GLuint uniformBlockIndex, GLenum pname, GLint* params);
+extern void (GLAPIENTRY *qglGetActiveUniformName)(GLuint program, GLuint uniformIndex, GLsizei bufSize, GLsizei* length, char* uniformName);
+extern void (GLAPIENTRY *qglGetActiveUniformsiv)(GLuint program, GLsizei uniformCount, const GLuint* uniformIndices, GLenum pname, GLint* params);
+extern void (GLAPIENTRY *qglGetAttachedShaders)(GLuint containerObj, GLsizei maxCount, GLsizei *count, GLuint *obj);
+extern void (GLAPIENTRY *qglGetBooleanv)(GLenum pname, GLboolean *params);
+extern void (GLAPIENTRY *qglGetCompressedTexImage)(GLenum target, GLint lod, void *img);
+extern void (GLAPIENTRY *qglGetDoublev)(GLenum pname, GLdouble *params);
+extern void (GLAPIENTRY *qglGetFloatv)(GLenum pname, GLfloat *params);
+extern void (GLAPIENTRY *qglGetIntegeri_v)(GLenum target, GLuint index, GLint* data);
+extern void (GLAPIENTRY *qglGetIntegerv)(GLenum pname, GLint *params);
+extern void (GLAPIENTRY *qglGetPointerv)(GLenum pname, GLvoid** params);
+extern void (GLAPIENTRY *qglGetProgramInfoLog)(GLuint obj, GLsizei maxLength, GLsizei *length, GLchar *infoLog);
+extern void (GLAPIENTRY *qglGetProgramiv)(GLuint obj, GLenum pname, GLint *params);
+extern void (GLAPIENTRY *qglGetQueryObjectiv)(GLuint qid, GLenum pname, GLint *params);
+extern void (GLAPIENTRY *qglGetQueryObjectuiv)(GLuint qid, GLenum pname, GLuint *params);
+extern void (GLAPIENTRY *qglGetQueryiv)(GLenum target, GLenum pname, GLint *params);
+extern void (GLAPIENTRY *qglGetShaderInfoLog)(GLuint obj, GLsizei maxLength, GLsizei *length, GLchar *infoLog);
+extern void (GLAPIENTRY *qglGetShaderSource)(GLuint obj, GLsizei maxLength, GLsizei *length, GLchar *source);
+extern void (GLAPIENTRY *qglGetShaderiv)(GLuint obj, GLenum pname, GLint *params);
+extern void (GLAPIENTRY *qglGetTexImage)(GLenum target, GLint level, GLenum format, GLenum type, GLvoid *pixels);
+extern void (GLAPIENTRY *qglGetTexLevelParameterfv)(GLenum target, GLint level, GLenum pname, GLfloat *params);
+extern void (GLAPIENTRY *qglGetTexLevelParameteriv)(GLenum target, GLint level, GLenum pname, GLint *params);
+extern void (GLAPIENTRY *qglGetTexParameterfv)(GLenum target, GLenum pname, GLfloat *params);
+extern void (GLAPIENTRY *qglGetTexParameteriv)(GLenum target, GLenum pname, GLint *params);
+extern void (GLAPIENTRY *qglGetUniformIndices)(GLuint program, GLsizei uniformCount, const char** uniformNames, GLuint* uniformIndices);
+extern void (GLAPIENTRY *qglGetUniformfv)(GLuint programObj, GLint location, GLfloat *params);
+extern void (GLAPIENTRY *qglGetUniformiv)(GLuint programObj, GLint location, GLint *params);
+extern void (GLAPIENTRY *qglGetVertexAttribPointerv)(GLuint index, GLenum pname, GLvoid **pointer);
+extern void (GLAPIENTRY *qglGetVertexAttribdv)(GLuint index, GLenum pname, GLdouble *params);
+extern void (GLAPIENTRY *qglGetVertexAttribfv)(GLuint index, GLenum pname, GLfloat *params);
+extern void (GLAPIENTRY *qglGetVertexAttribiv)(GLuint index, GLenum pname, GLint *params);
+extern void (GLAPIENTRY *qglHint)(GLenum target, GLenum mode);
+extern void (GLAPIENTRY *qglLinkProgram)(GLuint programObj);
+extern void (GLAPIENTRY *qglPixelStorei)(GLenum pname, GLint param);