intel: Use the GLSL-based meta clear when available.

Improves firefox-talos-gfx performance under GL when 3D clears are
enabled:
[  0]       gl-before     firefox-talos-gfx   20.193   20.251   0.27%    3/3
[  0]       gl-after      firefox-talos-gfx   18.013   18.040   0.19%    3/3

diff --git a/src/mesa/drivers/dri/intel/intel_clear.c b/src/mesa/drivers/dri/intel/intel_clear.c
index 5ab9873..81c062f 100644 (file)
--- a/src/mesa/drivers/dri/intel/intel_clear.c
+++ b/src/mesa/drivers/dri/intel/intel_clear.c
@@ -188,7 +188,10 @@ intelClear(struct gl_context *ctx, GLbitfield mask)
 
    if (tri_mask) {
       debug_mask("tri", tri_mask);
-      _mesa_meta_Clear(&intel->ctx, tri_mask);
+      if (ctx->Extensions.ARB_fragment_shader)
+        _mesa_meta_glsl_Clear(&intel->ctx, tri_mask);
+      else
+        _mesa_meta_Clear(&intel->ctx, tri_mask);
    }
 }