/*
 * Copyright (c) 2010-2022 Belledonne Communications SARL.
 *
 * This file is part of mediastreamer2 
 * (see https://gitlab.linphone.org/BC/public/mediastreamer2).
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef msogl_functions_h
#define msogl_functions_h

#ifdef __APPLE__
   #include "TargetConditionals.h"
#endif


#include <EGL/egl.h>

#if TARGET_OS_IPHONE
	#include <OpenGLES/ES3/gl.h>
#elif TARGET_OS_MAC
    #define GL_GLEXT_PROTOTYPES
	#include <GLES3/gl3.h>
#elif __ANDROID__
    #define GL_GLEXT_PROTOTYPES
	#include <GLES3/gl3.h>
#elif _WIN32
    #define GL_GLEXT_PROTOTYPES
    #include <EGL/eglext.h>
    #include <GLES3/gl3.h>
#else
	#ifndef QOPENGLFUNCTIONS_H // glew is already included by QT.
		#include <GL/glew.h>
	#else
	// Workaround for Qt, we need to undefine these defines. Fix error: expected unqualified-id before numeric constant on CursorShape
		#undef None
		#undef CursorShape
	#endif
#endif

#include <GLES3/gl3platform.h> // GL_APIENTRY
#include "bctoolbox/port.h" // bool_t

// =============================================================================

typedef void (GL_APIENTRY *resolveGlActiveTexture)(GLenum texture);
typedef void (GL_APIENTRY *resolveGlAttachShader)(GLuint program, GLuint shader);
typedef void (GL_APIENTRY *resolveGlBindAttribLocation)(GLuint program, GLuint index, const char *name);
typedef void (GL_APIENTRY *resolveGlBindBuffer)(GLenum target, GLuint buffer);
typedef void (GL_APIENTRY *resolveGlBindFramebuffer)(GLenum target, GLuint framebuffer);
typedef void (GL_APIENTRY *resolveGlBindRenderbuffer)(GLenum target, GLuint renderbuffer);
typedef void (GL_APIENTRY *resolveGlBindTexture)(GLenum target, GLuint texture);
typedef void (GL_APIENTRY *resolveGlBlendColor)(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha);
typedef void (GL_APIENTRY *resolveGlBlendEquation)(GLenum mode);
typedef void (GL_APIENTRY *resolveGlBlendEquationSeparate)(GLenum modeRGB, GLenum modeAlpha);
typedef void (GL_APIENTRY *resolveGlBlendFunc)(GLenum sfactor, GLenum dfactor);
typedef void (GL_APIENTRY *resolveGlBlendFuncSeparate)(GLenum srcRGB, GLenum dstRGB, GLenum srcAlpha, GLenum dstAlpha);
typedef void (GL_APIENTRY *resolveGlBufferData)(GLenum target, GLsizei *size, const void *data, GLenum usage);
typedef void (GL_APIENTRY *resolveGlBufferSubData)(GLenum target, GLint *offset, GLsizei *size, const void *data);
typedef GLenum (GL_APIENTRY *resolveGlCheckFramebufferStatus)(GLenum target);
typedef void (GL_APIENTRY *resolveGlClear)(GLbitfield mask);
typedef void (GL_APIENTRY *resolveGlClearColor)(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha);
typedef void (GL_APIENTRY *resolveGlClearDepthf)(GLclampf depth);
typedef void (GL_APIENTRY *resolveGlClearStencil)(GLint s);
typedef void (GL_APIENTRY *resolveGlColorMask)(GLboolean red, GLboolean green, GLboolean blue, GLboolean alpha);
typedef void (GL_APIENTRY *resolveGlCompileShader)(GLuint shader);
typedef void (GL_APIENTRY *resolveGlCompressedTexImage2D)(GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLint border, GLsizei imageSize, const void *data);
typedef void (GL_APIENTRY *resolveGlCompressedTexSubImage2D)(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLsizei imageSize, const void *data);
typedef void (GL_APIENTRY *resolveGlCopyTexImage2D)(GLenum target, GLint level, GLenum internalformat, GLint x, GLint y, GLsizei width, GLsizei height, GLint border);
typedef void (GL_APIENTRY *resolveGlCopyTexSubImage2D)(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint x, GLint y, GLsizei width, GLsizei height);
typedef GLuint (GL_APIENTRY *resolveGlCreateProgram)(void);
typedef GLuint (GL_APIENTRY *resolveGlCreateShader)(GLenum type);
typedef void (GL_APIENTRY *resolveGlCullFace)(GLenum mode);
typedef void (GL_APIENTRY *resolveGlDeleteBuffers)(GLsizei n, const GLuint *buffers);
typedef void (GL_APIENTRY *resolveGlDeleteFramebuffers)(GLsizei n, const GLuint *framebuffers);
typedef void (GL_APIENTRY *resolveGlDeleteProgram)(GLuint program);
typedef void (GL_APIENTRY *resolveGlDeleteRenderbuffers)(GLsizei n, const GLuint *renderbuffers);
typedef void (GL_APIENTRY *resolveGlDeleteShader)(GLuint shader);
typedef void (GL_APIENTRY *resolveGlDeleteTextures)(GLsizei n, const GLuint *textures);
typedef void (GL_APIENTRY *resolveGlDepthFunc)(GLenum func);
typedef void (GL_APIENTRY *resolveGlDepthMask)(GLboolean flag);
typedef void (GL_APIENTRY *resolveGlDepthRangef)(GLclampf zNear, GLclampf zFar);
typedef void (GL_APIENTRY *resolveGlDetachShader)(GLuint program, GLuint shader);
typedef void (GL_APIENTRY *resolveGlDisable)(GLenum cap);
typedef void (GL_APIENTRY *resolveGlDisableVertexAttribArray)(GLuint index);
typedef void (GL_APIENTRY *resolveGlDrawArrays)(GLenum mode, GLint first, GLsizei count);
typedef void (GL_APIENTRY *resolveGlDrawElements)(GLenum mode, GLsizei count, GLenum type, const GLvoid *indices);
typedef void (GL_APIENTRY *resolveGlEnable)(GLenum cap);
typedef void (GL_APIENTRY *resolveGlEnableVertexAttribArray)(GLuint index);
typedef void (GL_APIENTRY *resolveGlFinish)(void);
typedef void (GL_APIENTRY *resolveGlFlush)(void);
typedef void (GL_APIENTRY *resolveGlFramebufferRenderbuffer)(GLenum target, GLenum attachment, GLenum renderbuffertarget, GLuint renderbuffer);
typedef void (GL_APIENTRY *resolveGlFramebufferTexture2D)(GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level);
typedef void (GL_APIENTRY *resolveGlFrontFace)(GLenum mode);
typedef void (GL_APIENTRY *resolveGlGenBuffers)(GLsizei n, GLuint *buffers);
typedef void (GL_APIENTRY *resolveGlGenFramebuffers)(GLsizei n, GLuint *framebuffers);
typedef void (GL_APIENTRY *resolveGlGenRenderbuffers)(GLsizei n, GLuint *renderbuffers);
typedef void (GL_APIENTRY *resolveGlGenTextures)(GLsizei n, GLuint *textures);
typedef void (GL_APIENTRY *resolveGlGenerateMipmap)(GLenum target);
typedef void (GL_APIENTRY *resolveGlGetActiveAttrib)(GLuint program, GLuint index, GLsizei bufsize, GLsizei *length, GLint *size, GLenum *type, char *name);
typedef void (GL_APIENTRY *resolveGlGetActiveUniform)(GLuint program, GLuint index, GLsizei bufsize, GLsizei *length, GLint *size, GLenum *type, char *name);
typedef void (GL_APIENTRY *resolveGlGetAttachedShaders)(GLuint program, GLsizei maxcount, GLsizei *count, GLuint *shaders);
typedef GLint (GL_APIENTRY *resolveGlGetAttribLocation)(GLuint program, const char *name);
typedef void (GL_APIENTRY *resolveGlGetBooleanv)(GLenum pname, GLboolean *params);
typedef void (GL_APIENTRY *resolveGlGetBufferParameteriv)(GLenum target, GLenum pname, GLint *params);
typedef GLenum (GL_APIENTRY *resolveGlGetError)(void);
typedef void (GL_APIENTRY *resolveGlGetFloatv)(GLenum pname, GLfloat *params);
typedef void (GL_APIENTRY *resolveGlGetFramebufferAttachmentParameteriv)(GLenum target, GLenum attachment, GLenum pname, GLint *params);
typedef void (GL_APIENTRY *resolveGlGetIntegerv)(GLenum pname, GLint *params);
typedef void (GL_APIENTRY *resolveGlGetProgramInfoLog)(GLuint program, GLsizei bufsize, GLsizei *length, char *infolog);
typedef void (GL_APIENTRY *resolveGlGetProgramiv)(GLuint program, GLenum pname, GLint *params);
typedef void (GL_APIENTRY *resolveGlGetRenderbufferParameteriv)(GLenum target, GLenum pname, GLint *params);
typedef void (GL_APIENTRY *resolveGlGetShaderInfoLog)(GLuint shader, GLsizei bufsize, GLsizei *length, char *infolog);
typedef void (GL_APIENTRY *resolveGlGetShaderPrecisionFormat)(GLenum shadertype, GLenum precisiontype, GLint *range, GLint *precision);
typedef void (GL_APIENTRY *resolveGlGetShaderSource)(GLuint shader, GLsizei bufsize, GLsizei *length, char *source);
typedef void (GL_APIENTRY *resolveGlGetShaderiv)(GLuint shader, GLenum pname, GLint *params);
typedef const GLubyte *(GL_APIENTRY *resolveGlGetString)(GLenum name);
typedef void (GL_APIENTRY *resolveGlGetTexParameterfv)(GLenum target, GLenum pname, GLfloat *params);
typedef void (GL_APIENTRY *resolveGlGetTexParameteriv)(GLenum target, GLenum pname, GLint *params);
typedef GLint (GL_APIENTRY *resolveGlGetUniformLocation)(GLuint program, const char *name);
typedef void (GL_APIENTRY *resolveGlGetUniformfv)(GLuint program, GLint location, GLfloat *params);
typedef void (GL_APIENTRY *resolveGlGetUniformiv)(GLuint program, GLint location, GLint *params);
typedef void (GL_APIENTRY *resolveGlGetVertexAttribPointerv)(GLuint index, GLenum pname, void **pointer);
typedef void (GL_APIENTRY *resolveGlGetVertexAttribfv)(GLuint index, GLenum pname, GLfloat *params);
typedef void (GL_APIENTRY *resolveGlGetVertexAttribiv)(GLuint index, GLenum pname, GLint *params);
typedef void (GL_APIENTRY *resolveGlHint)(GLenum target, GLenum mode);
typedef GLboolean (GL_APIENTRY *resolveGlIsBuffer)(GLuint buffer);
typedef GLboolean (GL_APIENTRY *resolveGlIsEnabled)(GLenum cap);
typedef GLboolean (GL_APIENTRY *resolveGlIsFramebuffer)(GLuint framebuffer);
typedef GLboolean (GL_APIENTRY *resolveGlIsProgram)(GLuint program);
typedef GLboolean (GL_APIENTRY *resolveGlIsRenderbuffer)(GLuint renderbuffer);
typedef GLboolean (GL_APIENTRY *resolveGlIsShader)(GLuint shader);
typedef GLboolean (GL_APIENTRY *resolveGlIsTexture)(GLuint texture);
typedef void (GL_APIENTRY *resolveGlLineWidth)(GLfloat width);
typedef void (GL_APIENTRY *resolveGlLinkProgram)(GLuint program);
typedef void (GL_APIENTRY *resolveGlPixelStorei)(GLenum pname, GLint param);
typedef void (GL_APIENTRY *resolveGlPolygonOffset)(GLfloat factor, GLfloat units);
typedef void (GL_APIENTRY *resolveGlReadPixels)(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, GLvoid *pixels);
typedef void (GL_APIENTRY *resolveGlReleaseShaderCompiler)(void);
typedef void (GL_APIENTRY *resolveGlRenderbufferStorage)(GLenum target, GLenum internalformat, GLsizei width, GLsizei height);
typedef void (GL_APIENTRY *resolveGlSampleCoverage)(GLclampf value, GLboolean invert);
typedef void (GL_APIENTRY *resolveGlScissor)(GLint x, GLint y, GLsizei width, GLsizei height);
typedef void (GL_APIENTRY *resolveGlShaderBinary)(GLint n, const GLuint *shaders, GLenum binaryformat, const void *binary, GLint length);

#ifdef MS2_USE_OLD_OPENGL_PROTOTYPE
typedef void (GL_APIENTRY *resolveGlShaderSource)(GLuint shader, GLsizei count, const char **string, const GLint *length);
#else
typedef void (GL_APIENTRY *resolveGlShaderSource)(GLuint shader, GLsizei count, const char *const*string, const GLint *length);
#endif

typedef void (GL_APIENTRY *resolveGlStencilFunc)(GLenum func, GLint ref, GLuint mask);
typedef void (GL_APIENTRY *resolveGlStencilFuncSeparate)(GLenum face, GLenum func, GLint ref, GLuint mask);
typedef void (GL_APIENTRY *resolveGlStencilMask)(GLuint mask);
typedef void (GL_APIENTRY *resolveGlStencilMaskSeparate)(GLenum face, GLuint mask);
typedef void (GL_APIENTRY *resolveGlStencilOp)(GLenum fail, GLenum zfail, GLenum zpass);
typedef void (GL_APIENTRY *resolveGlStencilOpSeparate)(GLenum face, GLenum fail, GLenum zfail, GLenum zpass);
typedef void (GL_APIENTRY *resolveGlTexImage2D)(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const GLvoid *pixels);
typedef void (GL_APIENTRY *resolveGlTexParameterf)(GLenum target, GLenum pname, GLfloat param);
typedef void (GL_APIENTRY *resolveGlTexParameterfv)(GLenum target, GLenum pname, const GLfloat *params);
typedef void (GL_APIENTRY *resolveGlTexParameteri)(GLenum target, GLenum pname, GLint param);
typedef void (GL_APIENTRY *resolveGlTexParameteriv)(GLenum target, GLenum pname, const GLint *params);
typedef void (GL_APIENTRY *resolveGlTexSubImage2D)(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, const GLvoid *pixels);
typedef void (GL_APIENTRY *resolveGlUniform1f)(GLint location, GLfloat x);
typedef void (GL_APIENTRY *resolveGlUniform1fv)(GLint location, GLsizei count, const GLfloat *v);
typedef void (GL_APIENTRY *resolveGlUniform1i)(GLint location, GLint x);
typedef void (GL_APIENTRY *resolveGlUniform1iv)(GLint location, GLsizei count, const GLint *v);
typedef void (GL_APIENTRY *resolveGlUniform2f)(GLint location, GLfloat x, GLfloat y);
typedef void (GL_APIENTRY *resolveGlUniform2fv)(GLint location, GLsizei count, const GLfloat *v);
typedef void (GL_APIENTRY *resolveGlUniform2i)(GLint location, GLint x, GLint y);
typedef void (GL_APIENTRY *resolveGlUniform2iv)(GLint location, GLsizei count, const GLint *v);
typedef void (GL_APIENTRY *resolveGlUniform3f)(GLint location, GLfloat x, GLfloat y, GLfloat z);
typedef void (GL_APIENTRY *resolveGlUniform3fv)(GLint location, GLsizei count, const GLfloat *v);
typedef void (GL_APIENTRY *resolveGlUniform3i)(GLint location, GLint x, GLint y, GLint z);
typedef void (GL_APIENTRY *resolveGlUniform3iv)(GLint location, GLsizei count, const GLint *v);
typedef void (GL_APIENTRY *resolveGlUniform4f)(GLint location, GLfloat x, GLfloat y, GLfloat z, GLfloat w);
typedef void (GL_APIENTRY *resolveGlUniform4fv)(GLint location, GLsizei count, const GLfloat *v);
typedef void (GL_APIENTRY *resolveGlUniform4i)(GLint location, GLint x, GLint y, GLint z, GLint w);
typedef void (GL_APIENTRY *resolveGlUniform4iv)(GLint location, GLsizei count, const GLint *v);
typedef void (GL_APIENTRY *resolveGlUniformMatrix2fv)(GLint location, GLsizei count, GLboolean transpose, const GLfloat *value);
typedef void (GL_APIENTRY *resolveGlUniformMatrix3fv)(GLint location, GLsizei count, GLboolean transpose, const GLfloat *value);
typedef void (GL_APIENTRY *resolveGlUniformMatrix4fv)(GLint location, GLsizei count, GLboolean transpose, const GLfloat *value);
typedef void (GL_APIENTRY *resolveGlUseProgram)(GLuint program);
typedef void (GL_APIENTRY *resolveGlValidateProgram)(GLuint program);
typedef void (GL_APIENTRY *resolveGlVertexAttrib1f)(GLuint indx, GLfloat x);
typedef void (GL_APIENTRY *resolveGlVertexAttrib1fv)(GLuint indx, const GLfloat *values);
typedef void (GL_APIENTRY *resolveGlVertexAttrib2f)(GLuint indx, GLfloat x, GLfloat y);
typedef void (GL_APIENTRY *resolveGlVertexAttrib2fv)(GLuint indx, const GLfloat *values);
typedef void (GL_APIENTRY *resolveGlVertexAttrib3f)(GLuint indx, GLfloat x, GLfloat y, GLfloat z);
typedef void (GL_APIENTRY *resolveGlVertexAttrib3fv)(GLuint indx, const GLfloat *values);
typedef void (GL_APIENTRY *resolveGlVertexAttrib4f)(GLuint indx, GLfloat x, GLfloat y, GLfloat z, GLfloat w);
typedef void (GL_APIENTRY *resolveGlVertexAttrib4fv)(GLuint indx, const GLfloat *values);
typedef void (GL_APIENTRY *resolveGlVertexAttribPointer)(GLuint indx, GLint size, GLenum type, GLboolean normalized, GLsizei stride, const void *ptr);
typedef void (GL_APIENTRY *resolveGlViewport)(GLint x, GLint y, GLsizei width, GLsizei height);

// OpenGL 3.0+
typedef void (GL_APIENTRY *resolveGlGenVertexArrays)(GLsizei n, GLuint *arrays);
typedef void (GL_APIENTRY *resolveGlBindVertexArray)(GLuint array);

// Performance profiling
typedef void (GL_APIENTRY *glGenQueriesSignature)(GLsizei n, GLuint *ids);
typedef void (GL_APIENTRY *glBeginQuerySignature)(GLenum target, GLuint id);
typedef void (GL_APIENTRY *glEndQuerySignature)(GLenum target);
typedef void (GL_APIENTRY *glGetQueryObjectui64vSignature)(GLuint id, GLenum pname, GLuint64 *params);

// -----------------------------------------------------------------------------

typedef void *(GL_APIENTRY *resolveEGLGetProcAddress)(char const * procname);
typedef EGLenum (GL_APIENTRY *resolveEGLQueryAPI)(void);
typedef EGLBoolean (GL_APIENTRY *resolveEGLBindAPI)(EGLenum api);
typedef char const *(GL_APIENTRY *resolveEGLQueryString)(EGLDisplay display, EGLint name);
typedef EGLDisplay (GL_APIENTRY *resolveEGLGetPlatformDisplayEXT)(EGLenum platform, void *native_display, const EGLint *attrib_list);
typedef EGLDisplay (GL_APIENTRY *resolveEGLGetDisplay)(EGLNativeDisplayType display);
typedef EGLDisplay (GL_APIENTRY *resolveEGLGetCurrentDisplay)(void);
typedef EGLContext (GL_APIENTRY *resolveEGLGetCurrentContext)(void);
typedef EGLSurface (GL_APIENTRY *resolveEGLGetCurrentSurface)(EGLint readdraw);
typedef EGLBoolean (GL_APIENTRY *resolveEGLInitialize)(EGLDisplay dpy, EGLint *major, EGLint *minor);
typedef EGLBoolean (GL_APIENTRY *resolveEGLChooseConfig)(EGLDisplay dpy, const EGLint *attrib_list, EGLConfig *configs, EGLint config_size, EGLint *num_config);
typedef EGLContext (GL_APIENTRY *resolveEGLCreateContext)(EGLDisplay dpy, EGLConfig config, EGLContext share_context, const EGLint *attrib_list);
typedef EGLBoolean (GL_APIENTRY *resolveEGLMakeCurrent)(EGLDisplay dpy, EGLSurface draw, EGLSurface read, EGLContext ctx);
typedef EGLint (GL_APIENTRY *resolveEGLGetError)(void);
typedef EGLBoolean (GL_APIENTRY *resolveEGLSwapBuffers)(EGLDisplay dpy, EGLSurface surface);
typedef EGLBoolean (GL_APIENTRY *resolveEGLQuerySurface)(EGLDisplay dpy, EGLSurface surface, EGLint attribute, EGLint *value);
typedef EGLBoolean (GL_APIENTRY *resolveEGLDestroySurface)(EGLDisplay dpy, EGLSurface surface);
typedef EGLBoolean (GL_APIENTRY *resolveEGLDestroyContext)(EGLDisplay dpy, EGLContext ctx);
typedef EGLBoolean (GL_APIENTRY *resolveEGLTerminate)(EGLDisplay dpy);
typedef EGLBoolean (GL_APIENTRY *resolveEGLReleaseThread)(void);




typedef EGLSurface (GL_APIENTRY *resolveEGLCreateWindowSurface)(EGLDisplay dpy, EGLConfig config, EGLNativeWindowType win, const EGLint *attrib_list);



// -----------------------------------------------------------------------------
struct OpenGlFunctions {
	resolveGlActiveTexture glActiveTexture;
	resolveGlAttachShader glAttachShader;
	resolveGlBindAttribLocation glBindAttribLocation;
	resolveGlBindBuffer glBindBuffer; // OpenGL 2.0+
	// resolveGlBindFramebuffer glBindFramebuffer;
	// resolveGlBindRenderbuffer glBindRenderbuffer;
	resolveGlBindTexture glBindTexture;
	// resolveGlBlendColor glBlendColor;
	// resolveGlBlendEquation glBlendEquation;
	// resolveGlBlendEquationSeparate glBlendEquationSeparate;
	// resolveGlBlendFunc glBlendFunc;
	// resolveGlBlendFuncSeparate glBlendFuncSeparate;
	resolveGlBufferData glBufferData; // OpenGL 2.0+
	resolveGlBufferSubData glBufferSubData; // OpenGL 2.0+
	// resolveGlCheckFramebufferStatus glCheckFramebufferStatus;
	resolveGlClear glClear;
	resolveGlClearColor glClearColor;
	// resolveGlClearDepthf glClearDepthf;
	// resolveGlClearStencil glClearStencil;
	// resolveGlColorMask glColorMask;
	resolveGlCompileShader glCompileShader;
	// resolveGlCompressedTexImage2D glCompressedTexImage2D;
	// resolveGlCompressedTexSubImage2D glCompressedTexSubImage2D;
	// resolveGlCopyTexImage2D glCopyTexImage2D;
	// resolveGlCopyTexSubImage2D glCopyTexSubImage2D;
	resolveGlCreateProgram glCreateProgram;
	resolveGlCreateShader glCreateShader;
	// resolveGlCullFace glCullFace;
	// resolveGlDeleteBuffers glDeleteBuffers;
	// resolveGlDeleteFramebuffers glDeleteFramebuffers;
	resolveGlDeleteProgram glDeleteProgram;
	//resolveGlDeleteRenderbuffers glDeleteRenderbuffers;
	resolveGlDeleteShader glDeleteShader;
	resolveGlDeleteTextures glDeleteTextures;
	// resolveGlDepthFunc glDepthFunc;
	// resolveGlDepthMask glDepthMask;
	// resolveGlDepthRangef glDepthRangef;
	// resolveGlDetachShader glDetachShader;
	resolveGlDisable glDisable;
	// resolveGlDisableVertexAttribArray glDisableVertexAttribArray;
	resolveGlDrawArrays glDrawArrays;
	// resolveGlDrawElements glDrawElements;
	// resolveGlEnable glEnable;
	resolveGlEnableVertexAttribArray glEnableVertexAttribArray;
	 resolveGlFinish glFinish;
	// resolveGlFlush glFlush;
	// resolveGlFramebufferRenderbuffer glFramebufferRenderbuffer;
	// resolveGlFramebufferTexture2D glFramebufferTexture2D;
	// resolveGlFrontFace glFrontFace;
	resolveGlGenBuffers glGenBuffers; // OpenGL 2.0+
	// resolveGlGenFramebuffers glGenFramebuffers;
	// resolveGlGenRenderbuffers glGenRenderbuffers;
	resolveGlGenTextures glGenTextures;
	// resolveGlGenerateMipmap glGenerateMipmap;
	// resolveGlGetActiveAttrib glGetActiveAttrib;
	// resolveGlGetActiveUniform glGetActiveUniform;
	// resolveGlGetAttachedShaders glGetAttachedShaders;
	// resolveGlGetAttribLocation glGetAttribLocation;
	// resolveGlGetBooleanv glGetBooleanv;
	// resolveGlGetBufferParameteriv glGetBufferParameteriv;
	resolveGlGetError glGetError;
	// resolveGlGetFloatv glGetFloatv;
	//resolveGlGetFramebufferAttachmentParameteriv glGetFramebufferAttachmentParameteriv;
	resolveGlGetIntegerv glGetIntegerv;
	resolveGlGetProgramInfoLog glGetProgramInfoLog;
	resolveGlGetProgramiv glGetProgramiv;
	//resolveGlGetRenderbufferParameteriv glGetRenderbufferParameteriv;
	resolveGlGetShaderInfoLog glGetShaderInfoLog;
	// resolveGlGetShaderPrecisionFormat glGetShaderPrecisionFormat;
	// resolveGlGetShaderSource glGetShaderSource;
	resolveGlGetShaderiv glGetShaderiv;
	resolveGlGetString glGetString;
	// resolveGlGetTexParameterfv glGetTexParameterfv;
	// resolveGlGetTexParameteriv glGetTexParameteriv;
	resolveGlGetUniformLocation glGetUniformLocation;
	// resolveGlGetUniformfv glGetUniformfv;
	// resolveGlGetUniformiv glGetUniformiv;
	// resolveGlGetVertexAttribPointerv glGetVertexAttribPointerv;
	// resolveGlGetVertexAttribfv glGetVertexAttribfv;
	// resolveGlGetVertexAttribiv glGetVertexAttribiv;
	// resolveGlHint glHint;
	// resolveGlIsBuffer glIsBuffer;
	// resolveGlIsEnabled glIsEnabled;
	// resolveGlIsFramebuffer glIsFramebuffer;
	// resolveGlIsProgram glIsProgram;
	// resolveGlIsRenderbuffer glIsRenderbuffer;
	// resolveGlIsShader glIsShader;
	// resolveGlIsTexture glIsTexture;
	// resolveGlLineWidth glLineWidth;
	resolveGlLinkProgram glLinkProgram;
	resolveGlPixelStorei glPixelStorei;
	// resolveGlPolygonOffset glPolygonOffset;
	// resolveGlReadPixels glReadPixels;
	// resolveGlReleaseShaderCompiler glReleaseShaderCompiler;
	// resolveGlRenderbufferStorage glRenderbufferStorage;
	// resolveGlSampleCoverage glSampleCoverage;
	// resolveGlScissor glScissor;
	// resolveGlShaderBinary glShaderBinary;
	resolveGlShaderSource glShaderSource;
	// resolveGlStencilFunc glStencilFunc;
	// resolveGlStencilFuncSeparate glStencilFuncSeparate;
	// resolveGlStencilMask glStencilMask;
	// resolveGlStencilMaskSeparate glStencilMaskSeparate;
	// resolveGlStencilOp glStencilOp;
	// resolveGlStencilOpSeparate glStencilOpSeparate;
	resolveGlTexImage2D glTexImage2D;
	// resolveGlTexParameterf glTexParameterf;
	// resolveGlTexParameterfv glTexParameterfv;
	resolveGlTexParameteri glTexParameteri;
	// resolveGlTexParameteriv glTexParameteriv;
	resolveGlTexSubImage2D glTexSubImage2D;
	resolveGlUniform1f glUniform1f;
	// resolveGlUniform1fv glUniform1fv;
	resolveGlUniform1i glUniform1i;
	// resolveGlUniform1iv glUniform1iv;
	// resolveGlUniform2f glUniform2f;
	// resolveGlUniform2fv glUniform2fv;
	// resolveGlUniform2i glUniform2i;
	// resolveGlUniform2iv glUniform2iv;
	// resolveGlUniform3f glUniform3f;
	// resolveGlUniform3fv glUniform3fv;
	// resolveGlUniform3i glUniform3i;
	// resolveGlUniform3iv glUniform3iv;
	// resolveGlUniform4f glUniform4f;
	// resolveGlUniform4fv glUniform4fv;
	// resolveGlUniform4i glUniform4i;
	// resolveGlUniform4iv glUniform4iv;
	// resolveGlUniformMatrix2fv glUniformMatrix2fv;
	// resolveGlUniformMatrix3fv glUniformMatrix3fv;
	resolveGlUniformMatrix4fv glUniformMatrix4fv;
	resolveGlUseProgram glUseProgram;
	resolveGlValidateProgram glValidateProgram;
	// resolveGlVertexAttrib1f glVertexAttrib1f;
	// resolveGlVertexAttrib1fv glVertexAttrib1fv;
	// resolveGlVertexAttrib2f glVertexAttrib2f;
	// resolveGlVertexAttrib2fv glVertexAttrib2fv;
	// resolveGlVertexAttrib3f glVertexAttrib3f;
	// resolveGlVertexAttrib3fv glVertexAttrib3fv;
	// resolveGlVertexAttrib4f glVertexAttrib4f;
	// resolveGlVertexAttrib4fv glVertexAttrib4fv;
	resolveGlVertexAttribPointer glVertexAttribPointer;
	resolveGlViewport glViewport;

	resolveGlGenVertexArrays glGenVertexArrays; // OpenGL 3.0+
	resolveGlBindVertexArray glBindVertexArray; // OpenGL 3.0+

	// Performance profiling
	glGenQueriesSignature glGenQueries;
	glBeginQuerySignature glBeginQuery;
	glEndQuerySignature glEndQuery;
	glGetQueryObjectui64vSignature glGetQueryObjectui64v;

	resolveEGLGetProcAddress eglGetProcAddress;
	
	resolveEGLQueryAPI eglQueryAPI;
	resolveEGLBindAPI eglBindAPI;
	resolveEGLQueryString eglQueryString;
	resolveEGLGetPlatformDisplayEXT eglGetPlatformDisplayEXT;
	resolveEGLGetDisplay eglGetDisplay;
	resolveEGLGetCurrentDisplay eglGetCurrentDisplay;
	resolveEGLGetCurrentContext eglGetCurrentContext;
	resolveEGLGetCurrentSurface eglGetCurrentSurface;
	resolveEGLInitialize eglInitialize;
	resolveEGLChooseConfig eglChooseConfig;
	resolveEGLCreateContext eglCreateContext;
	resolveEGLCreateWindowSurface eglCreateWindowSurface;
	resolveEGLMakeCurrent eglMakeCurrent;
	resolveEGLGetError eglGetError;
	resolveEGLSwapBuffers eglSwapBuffers;
	resolveEGLQuerySurface eglQuerySurface;
	resolveEGLDestroySurface eglDestroySurface;
	resolveEGLDestroyContext eglDestroyContext;
	resolveEGLTerminate eglTerminate;
	resolveEGLReleaseThread eglReleaseThread;
	
	void * (*getProcAddress)(const char * name);// Set it to let MS2 initialize all functions
	bool_t eglInitialized;
	bool_t glInitialized;
};

typedef struct OpenGlFunctions OpenGlFunctions;

/**
 * Describes how an OpenGL context should be created through EGL
 */
typedef struct _MSEGLContextDescriptor {
	const EGLenum api;
	const EGLint *const attrib_list;
} MSEGLContextDescriptor;

#endif
