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glamor_init: clamp GLSL to 120 if platform doesn't have instanced arrays 

Hi,

I upgraded Xwayland and the assorted libraries from git masters today,
and noticed that glamor wouldn't work anymore on i.MX6/etnaviv. The
error was:

No provider of glVertexAttribDivisor found.  Requires one of:
    Desktop OpenGL 3.3
    OpenGL ES 3.0
    GL extension "GL_ANGLE_instanced_arrays"
    GL extension "GL_ARB_instanced_arrays"
    GL extension "GL_EXT_instanced_arrays"
    GL extension "GL_NV_instanced_arrays"

The problem is that etnaviv offers GLSL 140 on GL 2.1 and glamor
rendering assumes that glVertexAttribDivisor() is always available on
GLSL>=130, which is not the case here. Forcing GLSL 120 makes glamor
work fine again on this platform. After chatting with ajax in
#xorg-devel, the following solution was proposed.

This is my first time of submitting a patch, so please excuse me and
advise if I'm doing it wrong ;)

Cheers
Lukas (mntmn)
Reviewed-by: Eric Anholt <eric@anholt.net>

(cherry picked from commit 7437b6dbde)
This commit is contained in:
Lukas F. Hartmann 2018-05-15 21:51:56 +02:00 committed by Adam Jackson
parent 590374bd92
commit 662273397c
1 changed files with 8 additions and 0 deletions
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8
glamor/glamor.c
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@ -563,6 +563,14 @@ glamor_init(ScreenPtr screen, unsigned int flags)
if (!glamor_check_instruction_count(gl_version))
goto fail;
/* Glamor rendering assumes that platforms with GLSL 130+
* have instanced arrays, but this is not always the case.
* etnaviv offers GLSL 140 with OpenGL 2.1.
*/
if (glamor_priv->glsl_version >= 130 &&
!epoxy_has_gl_extension("GL_ARB_instanced_arrays"))
glamor_priv->glsl_version = 120;
} else {
if (gl_version < 20) {
ErrorF("Require Open GLES2.0 or later.\n");