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Added comments about GLES 3.0 support with 2.0 references.

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git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@1677 7f0cb862-5218-0410-a997-914c9d46530a
This commit is contained in:
dcnieho 2014-01-24 10:35:48 +00:00
parent 8c6c71d29d
commit aff8412f26
1 changed files with 9 additions and 0 deletions
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9
freeglut/freeglut/src/egl/fg_window_egl.c
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@ -30,6 +30,11 @@ int fghChooseConfig(EGLConfig* config) {
const EGLint attribs[] = {
EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
#ifdef GL_ES_VERSION_2_0
/*
* Khronos does not specify a EGL_OPENGL_ES3_BIT outside of the OpenGL extension "EGL_KHR_create_context". There are numerous references on the internet that
* say to use EGL_OPENGL_ES3_BIT, followed by many saying they can't find it in any headers. In fact, the offical updated specification for EGL does not have
* any references to OpenGL ES 3.0. Tests have shown that EGL_OPENGL_ES2_BIT will work with ES 3.0.
*/
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
#elif GL_VERSION_ES_CM_1_0 || GL_VERSION_ES_CL_1_0 || GL_VERSION_ES_CM_1_1 || GL_VERSION_ES_CL_1_1
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES_BIT,
@ -85,6 +90,10 @@ EGLContext fghCreateNewContextEGL( SFG_Window* window ) {
EGL_NONE
};
#ifdef GL_ES_VERSION_2_0
/*
* As GLES 3.0 is backwards compatible with GLES 2.0, we set 2.0 as default unless the user states a different version.
* This updates the context attributes and lets us check that the correct version was set when we query it after creation.
*/
int gles2Ver = fgState.MajorVersion <= 2 ? 2 : fgState.MajorVersion;
ctx_attribs[1] = gles2Ver;
#endif