Yay for modern GL! Wait, what?

rbxglew.cpp

#pragma comment(lib, "opengl32.lib")

#include "glew.c"

template <typename T, typename U> static void patchUnsafe(T& t, U& u)
{
    if (!t && u)
		t = reinterpret_cast<T>(u);
}

template <typename T> static void patch(T& t, T& u)
{
    if (!t && u)
		t = u;
}

void glewInitRBX()
{
#define P_APPLE(name) patch(name, name##APPLE)
#define P_EXT(name) patch(name, name##EXT)
#define P_ARB(name) patch(name, name##ARB)

    glewInit();

    // APPLE_vertex_array_object is the same as ARB_vertex_array_object
    P_APPLE(glBindVertexArray);
    P_APPLE(glDeleteVertexArrays);
    patchUnsafe(glGenVertexArrays, glGenVertexArraysAPPLE); // glGenVertexArraysAPPLE has a const-correctness bug
    P_APPLE(glIsVertexArray);
    P_APPLE(glBindVertexArray);

    // EXT_framebuffer_object is the same as ARB_framebuffer_object
    P_EXT(glBindFramebuffer);
    P_EXT(glBindRenderbuffer);
    P_EXT(glCheckFramebufferStatus);
    P_EXT(glDeleteFramebuffers);
    P_EXT(glDeleteRenderbuffers);
    P_EXT(glFramebufferRenderbuffer);
    P_EXT(glFramebufferTexture1D);
    P_EXT(glFramebufferTexture2D);
    P_EXT(glFramebufferTexture3D);
    P_EXT(glGenFramebuffers);
    P_EXT(glGenRenderbuffers);
    P_EXT(glGenerateMipmap);
    P_EXT(glGetFramebufferAttachmentParameteriv);
    P_EXT(glGetRenderbufferParameteriv);
    P_EXT(glIsFramebuffer);
    P_EXT(glIsRenderbuffer);
    P_EXT(glRenderbufferStorage);

    // EXT_texture3D is the same as core GL but the EXT API uses GLenum internalFormat instead of GLint
    patchUnsafe(glTexImage3D, glTexImage3DEXT);
    P_EXT(glTexSubImage3D);

    // ARB_texture_compression is the same as core GL
    P_ARB(glCompressedTexImage1D);
    P_ARB(glCompressedTexImage2D);
    P_ARB(glCompressedTexImage3D);
    P_ARB(glCompressedTexSubImage1D);
    P_ARB(glCompressedTexSubImage2D);
    P_ARB(glCompressedTexSubImage3D);
    P_ARB(glGetCompressedTexImage);

    // ARB_shader_objects is roughly the same as core GL
    patch(glAttachShader, glAttachObjectARB);
    P_ARB(glCompileShader);
    patch(glCreateProgram, glCreateProgramObjectARB);
    patch(glCreateShader, glCreateShaderObjectARB);
    patch(glDeleteProgram, glDeleteObjectARB);
    patch(glDeleteShader, glDeleteObjectARB);
    patch(glDetachShader, glDetachObjectARB);
    P_ARB(glGetActiveUniform);
    patch(glGetAttachedShaders, glGetAttachedObjectsARB);
    patch(glGetShaderInfoLog, glGetInfoLogARB);
    patch(glGetProgramInfoLog, glGetInfoLogARB);
    patch(glGetShaderiv, glGetObjectParameterivARB);
    patch(glGetProgramiv, glGetObjectParameterivARB);
    P_ARB(glGetShaderSource);
    P_ARB(glGetUniformLocation);
    P_ARB(glGetUniformfv);
    P_ARB(glGetUniformiv);
    P_ARB(glLinkProgram);
    P_ARB(glShaderSource);
    P_ARB(glUniform1f);
    P_ARB(glUniform1fv);
    P_ARB(glUniform1i);
    P_ARB(glUniform1iv);
    P_ARB(glUniform2f);
    P_ARB(glUniform2fv);
    P_ARB(glUniform2i);
    P_ARB(glUniform2iv);
    P_ARB(glUniform3f);
    P_ARB(glUniform3fv);
    P_ARB(glUniform3i);
    P_ARB(glUniform3iv);
    P_ARB(glUniform4f);
    P_ARB(glUniform4fv);
    P_ARB(glUniform4i);
    P_ARB(glUniform4iv);
    P_ARB(glUniformMatrix2fv);
    P_ARB(glUniformMatrix3fv);
    P_ARB(glUniformMatrix4fv);
    patch(glUseProgram, glUseProgramObjectARB);
    P_ARB(glValidateProgram);

#undef P_ARB
#undef P_EXT
#undef P_APPLE
}