OpenGLES emulation through Direct3D

In order to enable the necessary context creation OpenGLES you must set the flag force_gles in the struture ox::core::init_desc to true before Oxygine initialization.

    //initialize Oxygine's internal stuff
    core::init_desc desc;
	desc.title = "My Application";
	desc.w = 960;
	desc.h = 640;

	desc.force_gles = true;

    core::init(&desc);

The flag force_gles is intended to be used in conjunction with the library Angle.

Angle

The goal of ANGLE is to allow Windows users to seamlessly run WebGL and other OpenGL ES 2.0 content by translating OpenGL ES 2.0 API calls to DirectX 9 or DirectX 11 API calls.

First off you must compile Angle and you will receive 4 important files:

• libGLESv2.lib
• libGLESv2.dll
• libEGL.dll
• d3dcompiler_47.dll

Copy the dll files into the folder data and libGLESv2.lib into oxygine-framework/libs/

If you are compiling the libraries manually, then you must edit a little bit of code in the file SDL/src/video/windows/SDL_windowsopengl.c. Find the setting:

_this->gl_data->HAS_WGL_EXT_create_context_es2_profile = SDL_TRUE;

and comment it out:

//_this->gl_data->HAS_WGL_EXT_create_context_es2_profile = SDL_TRUE;

Visual Studio

In Linker settings you must set the Angle library libGLESv2.lib instead of OpenGL32.lib.

Visual Studio + CMake

If the project was made with the help of CMake, then set the flag FORCE_GLES=1. Example:

cmake -G"Visual Studio 12 2013" -DFORCE_GLES=1