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.

9 files changed, 14 insertions, 25 deletions

diff --git a/src/gallium/drivers/cell/spu/spu_command.c b/src/gallium/drivers/cell/spu/spu_command.c
index 5c0179d9546..12b855a3db2 100644
--- a/src/gallium/drivers/cell/spu/spu_command.c
+++ b/src/gallium/drivers/cell/spu/spu_command.c
@@ -405,8 +405,6 @@ cmd_state_sampler(const struct cell_command_sampler *sampler)
    case PIPE_TEX_FILTER_LINEAR:
       spu.min_sample_texture_2d[unit] = sample_texture_2d_bilinear;
       break;
-   case PIPE_TEX_FILTER_ANISO:
-      /* fall-through, for now */
    case PIPE_TEX_FILTER_NEAREST:
       spu.min_sample_texture_2d[unit] = sample_texture_2d_nearest;
       break;
@@ -418,8 +416,6 @@ cmd_state_sampler(const struct cell_command_sampler *sampler)
    case PIPE_TEX_FILTER_LINEAR:
       spu.mag_sample_texture_2d[unit] = sample_texture_2d_bilinear;
       break;
-   case PIPE_TEX_FILTER_ANISO:
-      /* fall-through, for now */
    case PIPE_TEX_FILTER_NEAREST:
       spu.mag_sample_texture_2d[unit] = sample_texture_2d_nearest;
       break;
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;
    }
diff --git a/src/gallium/drivers/i965/brw_pipe_sampler.c b/src/gallium/drivers/i965/brw_pipe_sampler.c
index 5ddc63f57ec..81712798a5d 100644
--- a/src/gallium/drivers/i965/brw_pipe_sampler.c
+++ b/src/gallium/drivers/i965/brw_pipe_sampler.c
@@ -48,8 +48,6 @@ static GLuint translate_img_filter( unsigned filter )
       return BRW_MAPFILTER_NEAREST;
    case PIPE_TEX_FILTER_LINEAR:
       return BRW_MAPFILTER_LINEAR;
-   case PIPE_TEX_FILTER_ANISO:
-      return BRW_MAPFILTER_ANISOTROPIC;
    default:
       assert(0);
       return BRW_MAPFILTER_NEAREST;
diff --git a/src/gallium/drivers/llvmpipe/lp_bld_sample_soa.c b/src/gallium/drivers/llvmpipe/lp_bld_sample_soa.c
index 47b68b71e25..c46fef50109 100644
--- a/src/gallium/drivers/llvmpipe/lp_bld_sample_soa.c
+++ b/src/gallium/drivers/llvmpipe/lp_bld_sample_soa.c
@@ -577,7 +577,6 @@ lp_build_sample_soa(LLVMBuilderRef builder,
       lp_build_sample_2d_nearest_soa(&bld, s, t, width, height, stride, data_ptr, texel);
       break;
    case PIPE_TEX_FILTER_LINEAR:
-   case PIPE_TEX_FILTER_ANISO:
       if(lp_format_is_rgba8(bld.format_desc))
          lp_build_sample_2d_linear_aos(&bld, s, t, width, height, stride, data_ptr, texel);
       else
diff --git a/src/gallium/drivers/llvmpipe/lp_tex_sample_c.c b/src/gallium/drivers/llvmpipe/lp_tex_sample_c.c
index 68520fa4f09..eaff6d5cdf7 100644
--- a/src/gallium/drivers/llvmpipe/lp_tex_sample_c.c
+++ b/src/gallium/drivers/llvmpipe/lp_tex_sample_c.c
@@ -1131,7 +1131,6 @@ lp_get_samples_2d_common(struct tgsi_sampler *tgsi_sampler,
       }
       break;
    case PIPE_TEX_FILTER_LINEAR:
-   case PIPE_TEX_FILTER_ANISO:
       {
          int x0[4], y0[4], x1[4], y1[4];
          float xw[4], yw[4]; /* weights */
@@ -1283,7 +1282,6 @@ lp_get_samples_3d(struct tgsi_sampler *tgsi_sampler,
       }
       break;
    case PIPE_TEX_FILTER_LINEAR:
-   case PIPE_TEX_FILTER_ANISO:
       {
          int x0[4], x1[4], y0[4], y1[4], z0[4], z1[4];
          float xw[4], yw[4], zw[4]; /* interpolation weights */
@@ -1414,7 +1412,6 @@ lp_get_samples_rect(struct tgsi_sampler *tgsi_sampler,
       }
       break;
    case PIPE_TEX_FILTER_LINEAR:
-   case PIPE_TEX_FILTER_ANISO:
       {
          int x0[4], y0[4], x1[4], y1[4];
          float xw[4], yw[4]; /* weights */
diff --git a/src/gallium/drivers/nv50/nv50_state.c b/src/gallium/drivers/nv50/nv50_state.c
index fd0a33d7f7e..1f67df814b1 100644
--- a/src/gallium/drivers/nv50/nv50_state.c
+++ b/src/gallium/drivers/nv50/nv50_state.c
@@ -146,7 +146,6 @@ nv50_sampler_state_create(struct pipe_context *pipe,
 		  (wrap_mode(cso->wrap_r) << 6));
 
 	switch (cso->mag_img_filter) {
-	case PIPE_TEX_FILTER_ANISO:
 	case PIPE_TEX_FILTER_LINEAR:
 		tsc[1] |= NV50TSC_1_1_MAGF_LINEAR;
 		break;
@@ -157,7 +156,6 @@ nv50_sampler_state_create(struct pipe_context *pipe,
 	}
 
 	switch (cso->min_img_filter) {
-	case PIPE_TEX_FILTER_ANISO:
 	case PIPE_TEX_FILTER_LINEAR:
 		tsc[1] |= NV50TSC_1_1_MINF_LINEAR;
 		break;
diff --git a/src/gallium/drivers/r300/r300_state.c b/src/gallium/drivers/r300/r300_state.c
index 49072462ec3..534c1b5935f 100644
--- a/src/gallium/drivers/r300/r300_state.c
+++ b/src/gallium/drivers/r300/r300_state.c
@@ -556,7 +556,8 @@ static void*
 
     sampler->filter0 |= r300_translate_tex_filters(state->min_img_filter,
                                                    state->mag_img_filter,
-                                                   state->min_mip_filter);
+                                                   state->min_mip_filter,
+                                                   state->max_anisotropy > 1.0);
 
     /* Unfortunately, r300-r500 don't support floating-point mipmap lods. */
     /* We must pass these to the emit function to clamp them properly. */
diff --git a/src/gallium/drivers/r300/r300_state_inlines.h b/src/gallium/drivers/r300/r300_state_inlines.h
index dbe42edd910..02adee27015 100644
--- a/src/gallium/drivers/r300/r300_state_inlines.h
+++ b/src/gallium/drivers/r300/r300_state_inlines.h
@@ -260,35 +260,33 @@ static INLINE uint32_t r300_translate_wrap(int wrap)
 static INLINE uint32_t r300_translate_tex_filters(int min, int mag, int mip)
 {
     uint32_t retval = 0;
-    switch (min) {
+    if (is_anisotropic)
+        retval |= R300_TX_MIN_FILTER_ANISO | R300_TX_MAG_FILTER_ANISO;
+    else {
+        switch (min) {
         case PIPE_TEX_FILTER_NEAREST:
             retval |= R300_TX_MIN_FILTER_NEAREST;
             break;
         case PIPE_TEX_FILTER_LINEAR:
             retval |= R300_TX_MIN_FILTER_LINEAR;
             break;
-        case PIPE_TEX_FILTER_ANISO:
-            retval |= R300_TX_MIN_FILTER_ANISO;
-            break;
         default:
             debug_printf("r300: Unknown texture filter %d\n", min);
             assert(0);
             break;
-    }
-    switch (mag) {
+        }
+        switch (mag) {
         case PIPE_TEX_FILTER_NEAREST:
             retval |= R300_TX_MAG_FILTER_NEAREST;
             break;
         case PIPE_TEX_FILTER_LINEAR:
             retval |= R300_TX_MAG_FILTER_LINEAR;
             break;
-        case PIPE_TEX_FILTER_ANISO:
-            retval |= R300_TX_MAG_FILTER_ANISO;
-            break;
         default:
             debug_printf("r300: Unknown texture filter %d\n", mag);
             assert(0);
             break;
+        }
     }
     switch (mip) {
         case PIPE_TEX_MIPFILTER_NONE:
diff --git a/src/gallium/drivers/svga/svga_pipe_sampler.c b/src/gallium/drivers/svga/svga_pipe_sampler.c
index 78053e755e2..460a101f8c0 100644
--- a/src/gallium/drivers/svga/svga_pipe_sampler.c
+++ b/src/gallium/drivers/svga/svga_pipe_sampler.c
@@ -76,7 +76,6 @@ static INLINE unsigned translate_img_filter( unsigned filter )
    switch (filter) {
    case PIPE_TEX_FILTER_NEAREST: return SVGA3D_TEX_FILTER_NEAREST;
    case PIPE_TEX_FILTER_LINEAR:  return SVGA3D_TEX_FILTER_LINEAR;
-   case PIPE_TEX_FILTER_ANISO:   return SVGA3D_TEX_FILTER_ANISOTROPIC;
    default:
       assert(0);
       return SVGA3D_TEX_FILTER_NEAREST;
@@ -107,6 +106,8 @@ svga_create_sampler_state(struct pipe_context *pipe,
    cso->magfilter = translate_img_filter( sampler->mag_img_filter );
    cso->minfilter = translate_img_filter( sampler->min_img_filter );
    cso->aniso_level = MAX2( (unsigned) sampler->max_anisotropy, 1 );
+   if(cso->aniso_level != 1)
+      cso->magfilter = cso->minfilter = SVGA3D_TEX_FILTER_ANISOTROPIC;
    cso->lod_bias = sampler->lod_bias;
    cso->addressu = translate_wrap_mode(sampler->wrap_s);
    cso->addressv = translate_wrap_mode(sampler->wrap_t);