gallium: make max_anisotropy a unsigned bitfield member

saves us a dword in sampler state, hw can't do non-integer aniso degree anyway.
To allow aniso 1x (which seems of dubious value but some hardware (radeons)
have such a mode, and even d3d allows specifiying it) redefine anisotropic
filtering as disabled only if max_anistropy is 0.

11 files changed, 33 insertions, 33 deletions

diff --git a/src/gallium/docs/source/cso/sampler.rst b/src/gallium/docs/source/cso/sampler.rst
index 044ffffcb4f..77979fc44d1 100644
--- a/src/gallium/docs/source/cso/sampler.rst
+++ b/src/gallium/docs/source/cso/sampler.rst
@@ -45,4 +45,6 @@ border_color
     RGBA color used for out-of-bounds coordinates.
 max_anisotropy
     Maximum filtering to apply anisotropically to textures. Setting this to
-    1.0 effectively disables anisotropic filtering.
+    0 disables anisotropic filtering. Any other setting enables anisotropic
+    filtering, however it's not unexpected some drivers only will change their
+    filtering with a setting of 2 and higher.
diff --git a/src/gallium/drivers/i915/i915_state.c b/src/gallium/drivers/i915/i915_state.c
index 14a9314dab3..62169918e2b 100644
--- a/src/gallium/drivers/i915/i915_state.c
+++ b/src/gallium/drivers/i915/i915_state.c
@@ -228,10 +228,10 @@ 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)
+   if (sampler->max_anisotropy > 1)
       minFilt = magFilt = FILTER_ANISOTROPIC;
 
-   if (sampler->max_anisotropy > 2.0) {
+   if (sampler->max_anisotropy > 2) {
       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 6aab5610043..c7c0e2ae95e 100644
--- a/src/gallium/drivers/i965/brw_pipe_sampler.c
+++ b/src/gallium/drivers/i965/brw_pipe_sampler.c
@@ -114,14 +114,12 @@ brw_create_sampler_state( struct pipe_context *pipe,
 
    /* XXX: anisotropy logic slightly changed: 
     */
-   if (template->max_anisotropy > 1.0) {
+   if (template->max_anisotropy > 1) {
       sampler->ss0.min_filter = BRW_MAPFILTER_ANISOTROPIC; 
       sampler->ss0.mag_filter = BRW_MAPFILTER_ANISOTROPIC;
 
-      if (template->max_anisotropy > 2.0) {
-	 sampler->ss3.max_aniso = MIN2((template->max_anisotropy - 2) / 2,
-				       BRW_ANISORATIO_16);
-      }
+      sampler->ss3.max_aniso = MIN2((template->max_anisotropy - 2) / 2,
+                                    BRW_ANISORATIO_16);
    }
 
    sampler->ss1.r_wrap_mode = translate_wrap_mode(template->wrap_r);
diff --git a/src/gallium/drivers/nv30/nv30_state.c b/src/gallium/drivers/nv30/nv30_state.c
index 8fc6856ee5e..d911c807074 100644
--- a/src/gallium/drivers/nv30/nv30_state.c
+++ b/src/gallium/drivers/nv30/nv30_state.c
@@ -139,13 +139,13 @@ nv30_sampler_state_create(struct pipe_context *pipe,
 
 	ps->en = 0;
 
-	if (cso->max_anisotropy >= 8.0) {
+	if (cso->max_anisotropy >= 8) {
 		ps->en |= NV34TCL_TX_ENABLE_ANISO_8X;
 	} else
-	if (cso->max_anisotropy >= 4.0) {
+	if (cso->max_anisotropy >= 4) {
 		ps->en |= NV34TCL_TX_ENABLE_ANISO_4X;
 	} else
-	if (cso->max_anisotropy >= 2.0) {
+	if (cso->max_anisotropy >= 2) {
 		ps->en |= NV34TCL_TX_ENABLE_ANISO_2X;
 	}
 
diff --git a/src/gallium/drivers/nv40/nv40_state.c b/src/gallium/drivers/nv40/nv40_state.c
index d068be6243a..2073bf07353 100644
--- a/src/gallium/drivers/nv40/nv40_state.c
+++ b/src/gallium/drivers/nv40/nv40_state.c
@@ -132,26 +132,26 @@ nv40_sampler_state_create(struct pipe_context *pipe,
 		    (wrap_mode(cso->wrap_r) << NV40TCL_TEX_WRAP_R_SHIFT));
 
 	ps->en = 0;
-	if (cso->max_anisotropy >= 2.0) {
+	if (cso->max_anisotropy >= 2) {
 		/* no idea, binary driver sets it, works without it.. meh.. */
 		ps->wrap |= (1 << 5);
 
-		if (cso->max_anisotropy >= 16.0) {
+		if (cso->max_anisotropy >= 16) {
 			ps->en |= NV40TCL_TEX_ENABLE_ANISO_16X;
 		} else
-		if (cso->max_anisotropy >= 12.0) {
+		if (cso->max_anisotropy >= 12) {
 			ps->en |= NV40TCL_TEX_ENABLE_ANISO_12X;
 		} else
-		if (cso->max_anisotropy >= 10.0) {
+		if (cso->max_anisotropy >= 10) {
 			ps->en |= NV40TCL_TEX_ENABLE_ANISO_10X;
 		} else
-		if (cso->max_anisotropy >= 8.0) {
+		if (cso->max_anisotropy >= 8) {
 			ps->en |= NV40TCL_TEX_ENABLE_ANISO_8X;
 		} else
-		if (cso->max_anisotropy >= 6.0) {
+		if (cso->max_anisotropy >= 6) {
 			ps->en |= NV40TCL_TEX_ENABLE_ANISO_6X;
 		} else
-		if (cso->max_anisotropy >= 4.0) {
+		if (cso->max_anisotropy >= 4) {
 			ps->en |= NV40TCL_TEX_ENABLE_ANISO_4X;
 		} else {
 			ps->en |= NV40TCL_TEX_ENABLE_ANISO_2X;
diff --git a/src/gallium/drivers/nv50/nv50_state.c b/src/gallium/drivers/nv50/nv50_state.c
index 05d519a2f95..7d304907b65 100644
--- a/src/gallium/drivers/nv50/nv50_state.c
+++ b/src/gallium/drivers/nv50/nv50_state.c
@@ -202,18 +202,18 @@ nv50_sampler_state_create(struct pipe_context *pipe,
 		break;
 	}
 
-	if (cso->max_anisotropy >= 16.0)
+	if (cso->max_anisotropy >= 16)
 		tsc[0] |= (7 << 20);
 	else
-	if (cso->max_anisotropy >= 12.0)
+	if (cso->max_anisotropy >= 12)
 		tsc[0] |= (6 << 20);
 	else {
-		tsc[0] |= (int)(cso->max_anisotropy * 0.5f) << 20;
+		tsc[0] |= (cso->max_anisotropy >> 1) << 20;
 
-		if (cso->max_anisotropy >= 4.0)
+		if (cso->max_anisotropy >= 4)
 			tsc[1] |= NV50TSC_1_1_UNKN_ANISO_35;
 		else
-		if (cso->max_anisotropy >= 2.0)
+		if (cso->max_anisotropy >= 2)
 			tsc[1] |= NV50TSC_1_1_UNKN_ANISO_15;
 	}
 
diff --git a/src/gallium/drivers/r300/r300_state.c b/src/gallium/drivers/r300/r300_state.c
index a6a4f99d730..8d68aa230bf 100644
--- a/src/gallium/drivers/r300/r300_state.c
+++ b/src/gallium/drivers/r300/r300_state.c
@@ -777,7 +777,7 @@ static void*
     sampler->filter0 |= r300_translate_tex_filters(state->min_img_filter,
                                                    state->mag_img_filter,
                                                    state->min_mip_filter,
-                                                   state->max_anisotropy > 1.0);
+                                                   state->max_anisotropy > 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 5df6815221f..779ba2c7be4 100644
--- a/src/gallium/drivers/r300/r300_state_inlines.h
+++ b/src/gallium/drivers/r300/r300_state_inlines.h
@@ -312,15 +312,15 @@ static INLINE uint32_t r300_translate_tex_filters(int min, int mag, int mip,
     return retval;
 }
 
-static INLINE uint32_t r300_anisotropy(float max_aniso)
+static INLINE uint32_t r300_anisotropy(unsigned max_aniso)
 {
-    if (max_aniso >= 16.0f) {
+    if (max_aniso >= 16) {
         return R300_TX_MAX_ANISO_16_TO_1;
-    } else if (max_aniso >= 8.0f) {
+    } else if (max_aniso >= 8) {
         return R300_TX_MAX_ANISO_8_TO_1;
-    } else if (max_aniso >= 4.0f) {
+    } else if (max_aniso >= 4) {
         return R300_TX_MAX_ANISO_4_TO_1;
-    } else if (max_aniso >= 2.0f) {
+    } else if (max_aniso >= 2) {
         return R300_TX_MAX_ANISO_2_TO_1;
     } else {
         return R300_TX_MAX_ANISO_1_TO_1;
diff --git a/src/gallium/drivers/svga/svga_pipe_sampler.c b/src/gallium/drivers/svga/svga_pipe_sampler.c
index b70081343d1..2a9adfbb067 100644
--- a/src/gallium/drivers/svga/svga_pipe_sampler.c
+++ b/src/gallium/drivers/svga/svga_pipe_sampler.c
@@ -102,8 +102,8 @@ svga_create_sampler_state(struct pipe_context *pipe,
    cso->mipfilter = translate_mip_filter(sampler->min_mip_filter);
    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->aniso_level = MAX2( sampler->max_anisotropy, 1 );
+   if(sampler->max_anisotropy)
       cso->magfilter = cso->minfilter = SVGA3D_TEX_FILTER_ANISOTROPIC;
    cso->lod_bias = sampler->lod_bias;
    cso->addressu = translate_wrap_mode(sampler->wrap_s);
diff --git a/src/gallium/drivers/trace/tr_dump_state.c b/src/gallium/drivers/trace/tr_dump_state.c
index 62fa09accf3..a4c72551269 100644
--- a/src/gallium/drivers/trace/tr_dump_state.c
+++ b/src/gallium/drivers/trace/tr_dump_state.c
@@ -435,11 +435,11 @@ void trace_dump_sampler_state(const struct pipe_sampler_state *state)
    trace_dump_member(uint, state, compare_mode);
    trace_dump_member(uint, state, compare_func);
    trace_dump_member(bool, state, normalized_coords);
+   trace_dump_member(uint, state, max_anisotropy);
    trace_dump_member(float, state, lod_bias);
    trace_dump_member(float, state, min_lod);
    trace_dump_member(float, state, max_lod);
    trace_dump_member_array(float, state, border_color);
-   trace_dump_member(float, state, max_anisotropy);
 
    trace_dump_struct_end();
 }
diff --git a/src/gallium/include/pipe/p_state.h b/src/gallium/include/pipe/p_state.h
index 23748acbdc2..5ac5c878135 100644
--- a/src/gallium/include/pipe/p_state.h
+++ b/src/gallium/include/pipe/p_state.h
@@ -281,10 +281,10 @@ struct pipe_sampler_state
    unsigned compare_mode:1;      /**< PIPE_TEX_COMPARE_x */
    unsigned compare_func:3;      /**< PIPE_FUNC_x */
    unsigned normalized_coords:1; /**< Are coords normalized to [0,1]? */
+   unsigned max_anisotropy:6;
    float lod_bias;               /**< LOD/lambda bias */
    float min_lod, max_lod;       /**< LOD clamp range, after bias */
    float border_color[4];
-   float max_anisotropy;
 };