Revert "waffle: Support OpenGL ES3"

This reverts commit 52df64af6a57d7fabc87afc4685588a2875a83d0.

After more closely reading the EGL_KHR_create_context spec and discussing
its history with Iam Romanick <idr@freedesktop.org>, I decided that
Waffle's interface for creating an OpenGL ES3 context needs changing.
I wish to model it after how GLES3 contexts are created in Khronos' OpenGL
ES3 conformance testsuite.

Discussion of EGL_OPENGL_ES3_BIT_KHR
------------------------------------
In version 13 of the EGL_KHR_create_context spec, the only way to
explicitly request a GLES3 context was to (1) choose an EGLConfig whose
EGL_RENDERABLE_TYPE attribute had the EGL_OPENGL_ES2_BIT set and (2) then
call eglCreateContext with EGL_CONTEXT_MAJOR_VERSION_KHR = 3. In version
14 was added a new enum, EGL_OPENGL_ES2_BIT_KHR, and thus a second way to
explicitly request a GLES3 context.

From a close reading of the EGL_KHR_create_context spec and from
a discussion with Romanick, I discovered that the EGL working group's
preferred method for creating a GLES3 context is that from version 13.
This observation is corroborated by Khronos' OpenGL ES3 conformance
testsuite, which does not use EGL_OPENGL_ES3_BIT_KHR.

Change in Waffle's interface
----------------------------
The original interface, as added by the reverted patch, for creating
a GLES3 context looks like this:

    int32_ attrib_list = {
        WAFFLE_CONTEXT_API, WAFFLE_CONTEXT_OPENGL_ES3,
        0,
    };
    config = waffle_config_choose(dpy, attrib_list);
    ctx = waffle_context_create(config, NULL);

Instead, I wish to change it to follow the original intent of the
EGL_KHR_create_context spec and the precedent in Khronos' OpenGL ES3
conformance testsuite:

    int32_ attrib_list = {
        WAFFLE_CONTEXT_API,           WAFFLE_CONTEXT_OPENGL_ES2,
        WAFFLE_CONTEXT_MAJOR_VERSION, 3,
        0,
    };
    config = waffle_config_choose(dpy, attrib_list);
    ctx = waffle_context_create(config, NULL);

Issues
------
In reimplementing Waffle's OpenGL ES3 support, I will be careful to
accomodate EGL implementations that require EGL_OPENGL_ES3_BIT_KHR to be
set.

Signed-off-by: Chad Versace <chad.versace@linux.intel.com>

1 files changed, 0 insertions, 1 deletions

diff --git a/include/waffle/waffle_enum.h b/include/waffle/waffle_enum.h
index 0437d64..df87e0e 100644
--- a/include/waffle/waffle_enum.h
+++ b/include/waffle/waffle_enum.h
@@ -65,7 +65,6 @@ enum waffle_enum {
         WAFFLE_CONTEXT_OPENGL                                   = 0x020b,
         WAFFLE_CONTEXT_OPENGL_ES1                               = 0x020c,
         WAFFLE_CONTEXT_OPENGL_ES2                               = 0x020d,
-        WAFFLE_CONTEXT_OPENGL_ES3                               = 0x0214,
 
     WAFFLE_CONTEXT_MAJOR_VERSION                                = 0x020e,
     WAFFLE_CONTEXT_MINOR_VERSION                                = 0x020f,