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i965/msaa: Allow GL_SAMPLES to be set to 1 prior to Gen6. 

This patch allows GL_SAMPLES to be set to either 0 or 1 on i965
platforms that don't support MSAA (those prior to Gen6).  Setting
GL_SAMPLES=1 has the same effect as setting it to 0 on these platforms
(because MSAA is unsupported), but is distinguishable via the GL API.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=50165

Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Paul Berry 2012-07-26 18:02:20 -07:00
parent 97fc89c6cb
commit c18806cebf
1 changed files with 9 additions and 1 deletions
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10
src/mesa/drivers/dri/intel/intel_fbo.c
View File

@ -202,7 +202,15 @@ quantize_num_samples(struct intel_context *intel, unsigned num_samples)
return 0;
return 0;
default:
/* MSAA unsupported */
/* MSAA unsupported. However, a careful reading of
* EXT_framebuffer_multisample reveals that we need to permit
* num_samples to be 1 (since num_samples is permitted to be as high as
* GL_MAX_SAMPLES, and GL_MAX_SAMPLES must be at least 1). Since
* platforms before Gen6 don't support MSAA, this is safe, because
* multisampling won't happen anyhow.
*/
if (num_samples > 0)
return 1;
return 0;
}
}