[Mesa-dev] [PATCH] glx: Allow to create any OpenGL ES version.
Emil Velikov
emil.l.velikov at gmail.com
Tue Apr 14 08:36:54 PDT 2015
On 14 April 2015 at 13:52, Jose Fonseca <jfonseca at vmware.com> wrote:
> On 13/04/15 22:59, Ian Romanick wrote:
>>
>> On 04/10/2015 03:36 PM, Jose Fonseca wrote:
>>>
>>> From: José Fonseca <jfonseca at vmware.com>
>>>
>>> The latest version of GLX_EXT_create_context_es2_profile states:
>>>
>>> "If the version requested is a valid and supported OpenGL-ES version,
>>> and the GLX_CONTEXT_ES_PROFILE_BIT_EXT bit is set in the
>>> GLX_CONTEXT_PROFILE_MASK_ARB attribute (see below), then the context
>>> returned will implement the OpenGL ES version requested."
>>>
>>> We must also export EXT_create_context_es_profile too, as
>>> EXT_create_context_es2_profile specification is crystal clear:
>>>
>>> "NOTE: implementations of this extension must export BOTH extension
>>> strings, for backwards compatibility with applications written
>>> against version 1 of this extension."
>>>
>>> Totally untested. (Just happened to noticed this while implementing
>>> GLX_EXT_create_context_es2_profile for st/xlib.)
>>>
>>> Reviewed-by: Brian Paul <brianp at vmware.com>
>>> Reviewed-by: Emil Velikov <emil.l.velikov at gmail.com>
>>>
>>> v2: Replicate the drisw_glx.c to dri2_glx.c and dri3_glx.c as suggested
>>> by Emil Velikov.
>>> ---
>>> src/glx/dri2_glx.c | 5 ++++-
>>> src/glx/dri3_glx.c | 5 ++++-
>>> src/glx/dri_common.c | 32 ++++++++++++++++----------------
>>> src/glx/drisw_glx.c | 2 ++
>>> 4 files changed, 26 insertions(+), 18 deletions(-)
>>>
>>> diff --git a/src/glx/dri2_glx.c b/src/glx/dri2_glx.c
>>> index 462d560..8192c54 100644
>>> --- a/src/glx/dri2_glx.c
>>> +++ b/src/glx/dri2_glx.c
>>> @@ -1102,9 +1102,12 @@ dri2BindExtensions(struct dri2_screen *psc, struct
>>> glx_display * priv,
>>> __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context");
>>> __glXEnableDirectExtension(&psc->base,
>>> "GLX_ARB_create_context_profile");
>>>
>>> - if ((mask & (1 << __DRI_API_GLES2)) != 0)
>>> + if ((mask & (1 << __DRI_API_GLES2)) != 0) {
>>> + __glXEnableDirectExtension(&psc->base,
>>> + "GLX_EXT_create_context_es_profile");
>>> __glXEnableDirectExtension(&psc->base,
>>>
>>> "GLX_EXT_create_context_es2_profile");
>>> + }
>>> }
>>>
>>> for (i = 0; extensions[i]; i++) {
>>> diff --git a/src/glx/dri3_glx.c b/src/glx/dri3_glx.c
>>> index 1ddc723..6973ad1 100644
>>> --- a/src/glx/dri3_glx.c
>>> +++ b/src/glx/dri3_glx.c
>>> @@ -1825,9 +1825,12 @@ dri3_bind_extensions(struct dri3_screen *psc,
>>> struct glx_display * priv,
>>> __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context");
>>> __glXEnableDirectExtension(&psc->base,
>>> "GLX_ARB_create_context_profile");
>>>
>>> - if ((mask & (1 << __DRI_API_GLES2)) != 0)
>>> + if ((mask & (1 << __DRI_API_GLES2)) != 0) {
>>> + __glXEnableDirectExtension(&psc->base,
>>> + "GLX_EXT_create_context_es_profile");
>>> __glXEnableDirectExtension(&psc->base,
>>> "GLX_EXT_create_context_es2_profile");
>>> + }
>>>
>>> for (i = 0; extensions[i]; i++) {
>>> /* when on a different gpu than the server, the server pixmaps
>>> diff --git a/src/glx/dri_common.c b/src/glx/dri_common.c
>>> index 63c8de3..541abbb 100644
>>> --- a/src/glx/dri_common.c
>>> +++ b/src/glx/dri_common.c
>>> @@ -544,9 +544,22 @@ dri2_convert_glx_attribs(unsigned num_attribs, const
>>> uint32_t *attribs,
>>> case GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB:
>>> *api = __DRI_API_OPENGL;
>>> break;
>>> - case GLX_CONTEXT_ES2_PROFILE_BIT_EXT:
>>> - *api = __DRI_API_GLES2;
>>> - break;
>>> + case GLX_CONTEXT_ES_PROFILE_BIT_EXT:
>>> + switch (*major_ver) {
>>> + case 3:
>>> + *api = __DRI_API_GLES3;
>>> + break;
>>> + case 2:
>>> + *api = __DRI_API_GLES2;
>>> + break;
>>> + case 1:
>>> + *api = __DRI_API_GLES;
>>> + break;
>>> + default:
>>> + *error = __DRI_CTX_ERROR_BAD_API;
>>> + return false;
>>> + }
>>> + break;
>>> default:
>>> *error = __DRI_CTX_ERROR_BAD_API;
>>> return false;
>>> @@ -577,19 +590,6 @@ dri2_convert_glx_attribs(unsigned num_attribs, const
>>> uint32_t *attribs,
>>> return false;
>>> }
>>>
>>> - /* The GLX_EXT_create_context_es2_profile spec says:
>>> - *
>>> - * "... If the version requested is 2.0, and the
>>> - * GLX_CONTEXT_ES2_PROFILE_BIT_EXT bit is set in the
>>> - * GLX_CONTEXT_PROFILE_MASK_ARB attribute (see below), then the
>>> context
>>> - * returned will implement OpenGL ES 2.0. This is the only way in
>>> which
>>> - * an implementation may request an OpenGL ES 2.0 context."
>>> - */
>>> - if (*api == __DRI_API_GLES2 && (*major_ver != 2 || *minor_ver != 0))
>>> {
>>> - *error = __DRI_CTX_ERROR_BAD_API;
>>> - return false;
>>> - }
>>
>>
>> I guess this text was removed from the extension spec, and now we rely
>> on some other layer detecting invalid versions (like 2.1)?
>
>
> Yes, the spec replaced that with
>
> "... If the version requested is a valid and supported OpenGL-ES
> version,
> and the GLX_CONTEXT_ES_PROFILE_BIT_EXT bit is set in the
> GLX_CONTEXT_PROFILE_MASK_ARB attribute (see below), then the context
> returned will implement the OpenGL ES version requested."
>
> That is, GLX_EXT_create_context_es_profile effectively allows to create any
> GLES version from 1.x to 3.x.
>
> And we never validated the minor version on src/glx/dri_common.c.
>
>>
>> This patch combined with Chad's patch seems like it should work... I'm a
>> little confused why Waffle doesn't like it. :(
>
>
> I tried to repro, but my main development machine has native NVIDIA drivers
> (no DRI), and somehow swrast refuses to load, even with gles2.
>
>
> Maybe this is what's missing:
>
> diff --git a/src/glx/dri2_glx.c b/src/glx/dri2_glx.c
> index 8192c54..192525a 100644
> --- a/src/glx/dri2_glx.c
> +++ b/src/glx/dri2_glx.c
> @@ -1102,7 +1102,7 @@ dri2BindExtensions(struct dri2_screen *psc, struct
> glx_display * priv,
> __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context");
> __glXEnableDirectExtension(&psc->base,
> "GLX_ARB_create_context_profile");
>
> - if ((mask & (1 << __DRI_API_GLES2)) != 0) {
> + if ((mask & ((1 << __DRI_API_GLES2) | (1 << __DRI_API_GLES3))) != 0)
> {
> __glXEnableDirectExtension(&psc->base,
> "GLX_EXT_create_context_es_profile");
> __glXEnableDirectExtension(&psc->base,
> diff --git a/src/glx/dri3_glx.c b/src/glx/dri3_glx.c
> index 6973ad1..a8ef8b5 100644
> --- a/src/glx/dri3_glx.c
> +++ b/src/glx/dri3_glx.c
> @@ -1825,7 +1825,7 @@ dri3_bind_extensions(struct dri3_screen *psc, struct
> glx_display * priv,
> __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context");
> __glXEnableDirectExtension(&psc->base,
> "GLX_ARB_create_context_profile");
>
> - if ((mask & (1 << __DRI_API_GLES2)) != 0) {
> + if ((mask & ((1 << __DRI_API_GLES2) | (1 << __DRI_API_GLES3)) != 0) {
> __glXEnableDirectExtension(&psc->base,
> "GLX_EXT_create_context_es_profile");
> __glXEnableDirectExtension(&psc->base,
>
>
After a bit of looking around it seems that we due to
glXCreateContextAttribsARB's
xcb_glx_create_context_attribs_arb_checked().
So I've skimmed through the xserver's glx/createcontext.c which seems
to explicitly error out if the version is different from 2.0
case GLX_CONTEXT_ES2_PROFILE_BIT_EXT:
...
if (major_version != 2 || minor_version != 0)
return __glXError(GLXBadProfileARB);
I'm leaning that we need Jose's patch above (apart from updating the
xserver), although perhaps we should handle __DRI_API_GLES and drisw
as well ?
Now if we can find a brave soul to rebuild xserver, as I cannot really
mock around with mine atm that would be great :-) A small side note
piglit's glx_arb_create_context tests might need an update (there
might be a regression or two depending on how lucky we are).
Cheers,
Emil
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