gallium: Add TEX_FILTER_ANISO img filter

Hardware almost universally expects us to set a special filtering mode
when anisotropic filtering is enabled, as opposed to varying a max-aniso
values.  Do this once in the state tracker & simplify the driver code.

3 files changed, 30 insertions, 30 deletions

diff --git a/src/gallium/drivers/i915simple/i915_state.c b/src/gallium/drivers/i915simple/i915_state.c
index d9ab483bfca..57b195ea8d7 100644
--- a/src/gallium/drivers/i915simple/i915_state.c
+++ b/src/gallium/drivers/i915simple/i915_state.c
@@ -71,6 +71,8 @@ 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;
@@ -84,7 +86,7 @@ static unsigned translate_mip_filter( unsigned filter )
       return MIPFILTER_NONE;
    case PIPE_TEX_MIPFILTER_NEAREST:
       return MIPFILTER_NEAREST;
-   case PIPE_TEX_FILTER_LINEAR:
+   case PIPE_TEX_MIPFILTER_LINEAR:
       return MIPFILTER_LINEAR;
    default:
       assert(0);
@@ -211,16 +213,11 @@ i915_create_sampler_state(struct pipe_context *pipe,
    cso->templ = sampler;
 
    mipFilt = translate_mip_filter(sampler->min_mip_filter);
-   if (sampler->max_anisotropy > 1.0) {
-      minFilt = FILTER_ANISOTROPIC;
-      magFilt = FILTER_ANISOTROPIC;
-      if (sampler->max_anisotropy > 2.0) {
-         cso->state[0] |= SS2_MAX_ANISO_4;
-      }
-   }
-   else {
-      minFilt = translate_img_filter( sampler->min_img_filter );
-      magFilt = translate_img_filter( sampler->mag_img_filter );
+   minFilt = translate_img_filter( sampler->min_img_filter );
+   magFilt = translate_img_filter( sampler->mag_img_filter );
+   
+   if (sampler->max_anisotropy > 2.0) {
+      cso->state[0] |= SS2_MAX_ANISO_4;
    }
 
    {
diff --git a/src/gallium/drivers/i965simple/brw_wm_sampler_state.c b/src/gallium/drivers/i965simple/brw_wm_sampler_state.c
index ff5ba7e7c7a..b9eaee56ee8 100644
--- a/src/gallium/drivers/i965simple/brw_wm_sampler_state.c
+++ b/src/gallium/drivers/i965simple/brw_wm_sampler_state.c
@@ -136,6 +136,9 @@ static void brw_update_sampler_state( const struct pipe_sampler_state *pipe_samp
    case PIPE_TEX_FILTER_LINEAR:
       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
       break;
+   case PIPE_TEX_FILTER_ANISO:
+      sampler->ss0.min_filter = BRW_MAPFILTER_ANISOTROPIC;
+      break;
    default:
       break;
    }
@@ -155,26 +158,23 @@ static void brw_update_sampler_state( const struct pipe_sampler_state *pipe_samp
    }
    /* Set Anisotropy:
     */
-   if (pipe_sampler->max_anisotropy > 1.0) {
-      sampler->ss0.min_filter = BRW_MAPFILTER_ANISOTROPIC;
-      sampler->ss0.mag_filter = BRW_MAPFILTER_ANISOTROPIC;
-
-      if (pipe_sampler->max_anisotropy > 2.0) {
-	 sampler->ss3.max_aniso = MAX2((pipe_sampler->max_anisotropy - 2) / 2,
-				       BRW_ANISORATIO_16);
-      }
+   switch (pipe_sampler->mag_img_filter) {
+   case PIPE_TEX_FILTER_NEAREST:
+      sampler->ss0.mag_filter = BRW_MAPFILTER_NEAREST;
+      break;
+   case PIPE_TEX_FILTER_LINEAR:
+      sampler->ss0.mag_filter = BRW_MAPFILTER_LINEAR;
+      break;
+   case PIPE_TEX_FILTER_ANISO:
+      sampler->ss0.mag_filter = BRW_MAPFILTER_LINEAR;
+      break;
+   default:
+      break;
    }
-   else {
-      switch (pipe_sampler->mag_img_filter) {
-      case PIPE_TEX_FILTER_NEAREST:
-	 sampler->ss0.mag_filter = BRW_MAPFILTER_NEAREST;
-	 break;
-      case PIPE_TEX_FILTER_LINEAR:
-	 sampler->ss0.mag_filter = BRW_MAPFILTER_LINEAR;
-	 break;
-      default:
-	 break;
-      }
+
+   if (pipe_sampler->max_anisotropy > 2.0) {
+      sampler->ss3.max_aniso = MAX2((pipe_sampler->max_anisotropy - 2) / 2,
+                                    BRW_ANISORATIO_16);
    }
 
    sampler->ss1.s_wrap_mode = translate_wrap_mode(pipe_sampler->wrap_s);
diff --git a/src/gallium/drivers/softpipe/sp_tex_sample.c b/src/gallium/drivers/softpipe/sp_tex_sample.c
index 0ced585c7f3..34da6356d70 100644
--- a/src/gallium/drivers/softpipe/sp_tex_sample.c
+++ b/src/gallium/drivers/softpipe/sp_tex_sample.c
@@ -714,6 +714,7 @@ sp_get_samples_2d_common(struct tgsi_sampler *sampler,
       }
       break;
    case PIPE_TEX_FILTER_LINEAR:
+   case PIPE_TEX_FILTER_ANISO:
       for (j = 0; j < QUAD_SIZE; j++) {
          float tx[4][4], a, b;
          int x0, y0, x1, y1, c;
@@ -846,6 +847,7 @@ sp_get_samples_3d(struct tgsi_sampler *sampler,
       }
       break;
    case PIPE_TEX_FILTER_LINEAR:
+   case PIPE_TEX_FILTER_ANISO:
       for (j = 0; j < QUAD_SIZE; j++) {
          float texel0[4][4], texel1[4][4];
          float xw, yw, zw; /* interpolation weights */
@@ -972,6 +974,7 @@ sp_get_samples_rect(struct tgsi_sampler *sampler,
       }
       break;
    case PIPE_TEX_FILTER_LINEAR:
+   case PIPE_TEX_FILTER_ANISO:
       for (j = 0; j < QUAD_SIZE; j++) {
          float tx[4][4], a, b;
          int x0, y0, x1, y1, c;