i965: add software fallback for conformant 3D textures and GL_CLAMP

The i965 hardware cannot do GL_CLAMP behavior on textures; an earlier
commit forced a software fallback if strict conformance was required
(i.e. the INTEL_STRICT_CONFORMANCE environment variable was set) and
2D textures were used, but it was somewhat flawed - it could trigger
the software fallback even if 2D textures weren't enabled, as long
as one texture unit was enabled.

This fixes that, and adds software fallback for GL_CLAMP behavior with
1D and 3D textures.

It also adds support for a particular setting of the INTEL_STRICT_CONFORMANCE
environment variable, which forces software fallbacks to be taken *all*
the time.  This is helpful with debugging.  The value is:
   export INTEL_STRICT_CONFORMANCE=2

1 files changed, 2 insertions, 2 deletions

diff --git a/src/mesa/drivers/dri/i915/intel_tris.c b/src/mesa/drivers/dri/i915/intel_tris.c
index e80996580c7..a857803b2ee 100644
--- a/src/mesa/drivers/dri/i915/intel_tris.c
+++ b/src/mesa/drivers/dri/i915/intel_tris.c
@@ -989,7 +989,7 @@ intelChooseRenderState(GLcontext * ctx)
             intel->draw_tri = intel_fallback_tri;
 
          if (flags & DD_TRI_SMOOTH) {
-	    if (intel->strict_conformance)
+	    if (intel->conformance_mode > 0)
 	       intel->draw_tri = intel_fallback_tri;
 	 }
 
@@ -1001,7 +1001,7 @@ intelChooseRenderState(GLcontext * ctx)
 	 }
 
 	 if (flags & DD_POINT_SMOOTH) {
-	    if (intel->strict_conformance)
+	    if (intel->conformance_mode > 0)
 	       intel->draw_point = intel_fallback_point;
 	 }