INSTALL.txt
author Sam Lantinga <slouken@libsdl.org>
Wed, 18 Oct 2017 08:52:04 -0700
changeset 11630 ad4b5d85edee
parent 10893 54480745c410
permissions -rw-r--r--
Fixed bug 3821 - Allow SDL_CreateWindow and SDL_CreateRenderer with OpenGL ES 3.0 (GLES3) for Angle (Windows)

Carlos

Angle supports GLES3 but when using these functions (SDL_CreateWindow and SDL_CreateRenderer), defaults again to GLES2.0.

A current workaround (hack) to retrieve a GLES3.0 context with Angle is:

1) set

SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);

after InitSDL AND after calling SDL_CreateWindow (before SDL_CreateRenderer)

2) Comment lines 2032-2044 in SDL_render_gles2.c, funtion GLES2_CreateRenderer

window_flags = SDL_GetWindowFlags(window);
if (!(window_flags & SDL_WINDOW_OPENGL) ||
profile_mask != SDL_GL_CONTEXT_PROFILE_ES || major != RENDERER_CONTEXT_MAJOR || minor != RENDERER_CONTEXT_MINOR) {

changed_window = SDL_TRUE;
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, RENDERER_CONTEXT_MAJOR);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, RENDERER_CONTEXT_MINOR);

if (SDL_RecreateWindow(window, window_flags | SDL_WINDOW_OPENGL) < 0) {
goto error;
}
}

This retrives a GLES3 context as confirmed using glGetString(GL_VERSION). This should be fixed by modifying a few if's.
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To compile and install SDL:
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    1.  Windows with Visual Studio:
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        * Read VisualC.html
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        Windows with gcc, either native or cross-compiling:
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        * Read the FAQ at https://wiki.libsdl.org/moin.fcg/FAQWindows
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        * Run './configure; make; make install'
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        Mac OS X with Xcode:
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        * Read docs/README-macosx.md
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        Mac OS X from the command line:
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        * Run './configure; make; make install'
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        Linux and other UNIX systems:
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        * Run './configure; make; make install'
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        Android:
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        * Read docs/README-android.md
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        iOS:
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        * Read docs/README-ios.md
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        Using Cmake:
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        * Read docs/README-cmake.md
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    2.  Look at the example programs in ./test, and check out the online
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        documentation at https://wiki.libsdl.org/
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    3.  Join the SDL developer mailing list by sending E-mail to
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    	sdl-request@libsdl.org
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        and put "subscribe" in the subject of the message.
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        Or alternatively you can use the web interface:
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            https://www.libsdl.org/mailing-list.php
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That's it!
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Sam Lantinga <slouken@libsdl.org>