gallium: remove PIPE_TEX_FILTER_ANISO

This patch removes PIPE_TEX_FILTER_ANISO.

Anisotropic filtering is enabled if and only if max_anisotropy > 1.0.
Values between 0.0 and 1.0, inclusive, of max_anisotropy are to be
considered equivalent, and meaning to turn off anisotropic filtering.

This approach has the small drawback of eliminating the possibility of
enabling anisotropic filter on either minification or magnification
separately, which Radeon hardware seems to support, is currently
support by Gallium but not exposed to OpenGL.  If this is actually
useful it could be handled by splitting max_anisotropy in two values
and adding an appropriate OpenGL extension.

NOTE: some fiddling & reformatting by keithw to get this patch to
apply.  Hopefully nothing broken in the process.

1 files changed, 3 insertions, 2 deletions

diff --git a/src/gallium/drivers/i915/i915_state.c b/src/gallium/drivers/i915/i915_state.c
index 1528afc8599..5f5b6f8e185 100644
--- a/src/gallium/drivers/i915/i915_state.c
+++ b/src/gallium/drivers/i915/i915_state.c
@@ -74,8 +74,6 @@ static unsigned translate_img_filter( unsigned filter )
       return FILTER_NEAREST;
    case PIPE_TEX_FILTER_LINEAR:
       return FILTER_LINEAR;
-   case PIPE_TEX_FILTER_ANISO:
-      return FILTER_ANISOTROPIC;
    default:
       assert(0);
       return FILTER_NEAREST;
@@ -221,6 +219,9 @@ i915_create_sampler_state(struct pipe_context *pipe,
    minFilt = translate_img_filter( sampler->min_img_filter );
    magFilt = translate_img_filter( sampler->mag_img_filter );
    
+   if (sampler->max_anisotropy > 1.0)
+      minFilt = magFilt = FILTER_ANISOTROPIC;
+
    if (sampler->max_anisotropy > 2.0) {
       cso->state[0] |= SS2_MAX_ANISO_4;
    }