Mesa (master): st/mesa: only enable GL_EXT_framebuffer_multisample if GL_MAX_SAMPLES >= 2

[Brian Paul]

Module: Mesa
Branch: master
Commit: c80bacba2ed88bccc92ab7a7151e14ad32729249
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=c80bacba2ed88bccc92ab7a7151e14ad32729249

Author: Brian Paul <brianp at vmware.com>
Date:   Mon Jan 28 11:32:13 2013 -0700

st/mesa: only enable GL_EXT_framebuffer_multisample if GL_MAX_SAMPLES >= 2

We never really have multisampling with one sample per pixel.
See also http://bugs.freedesktop.org/show_bug.cgi?id=59873

Note: This is a candidate for the 9.0 branch.

Reviewed-by: Jose Fonseca <jfonseca at vmware.com>

---

 src/mesa/state_tracker/st_extensions.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/src/mesa/state_tracker/st_extensions.c b/src/mesa/state_tracker/st_extensions.c
index f0d8a4c..34c0d7b 100644
--- a/src/mesa/state_tracker/st_extensions.c
+++ b/src/mesa/state_tracker/st_extensions.c
@@ -534,7 +534,6 @@ void st_init_extensions(struct st_context *st)
    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
    ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
    ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
-   ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
    ctx->Extensions.EXT_fog_coord = GL_TRUE;
    ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
@@ -657,6 +656,9 @@ void st_init_extensions(struct st_context *st)
       /* one sample doesn't really make sense */
       ctx->Const.MaxSamples = 0;
    }
+   else if (ctx->Const.MaxSamples >= 2) {
+      ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
+   }
 
    if (ctx->Const.MaxDualSourceDrawBuffers > 0)
       ctx->Extensions.ARB_blend_func_extended = GL_TRUE;