[Mesa-dev] [PATCH] r600g: add support for anisotropic filtering

[Carl-Philip Haensch]

 From b5ad4e6fb399203afcfe2a5ccb35bb8ccad28b65 Mon Sep 17 00:00:00 2001
From: Carl-Philip Haensch <carli at carli-laptop.(none)>
Date: Fri, 6 May 2011 22:48:08 +0200
Subject: [PATCH] r600g: add support for anisotropic filtering

---
  src/gallium/drivers/r600/r600_state.c |   20 +++++++++++++++++---
  src/gallium/drivers/r600/r600d.h      |    9 +++++++++
  2 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/src/gallium/drivers/r600/r600_state.c  
b/src/gallium/drivers/r600/r600_state.c
index 3f979cf..aeffb9e 100644
--- a/src/gallium/drivers/r600/r600_state.c
+++ b/src/gallium/drivers/r600/r600_state.c
@@ -364,6 +364,17 @@ static void *r600_create_rs_state(struct  
pipe_context *ctx,
  	return rstate;
  }

+
+
+static inline unsigned r600_tex_aniso_filter(unsigned filter)
+{
+	if (filter <= 1)   return 0;
+	if (filter <= 2)   return 1;
+	if (filter <= 4)   return 2;
+	if (filter <= 8)   return 3;
+	 /* else */        return 4;
+}
+
  static void *r600_create_sampler_state(struct pipe_context *ctx,
  					const struct pipe_sampler_state *state)
  {
@@ -376,13 +387,15 @@ static void *r600_create_sampler_state(struct  
pipe_context *ctx,

  	rstate->id = R600_PIPE_STATE_SAMPLER;
  	util_pack_color(state->border_color, PIPE_FORMAT_B8G8R8A8_UNORM, &uc);
+	unsigned aniso_flag_offset = state->max_anisotropy > 1 ? 4 : 0;
  	r600_pipe_state_add_reg(rstate, R_03C000_SQ_TEX_SAMPLER_WORD0_0,
  			S_03C000_CLAMP_X(r600_tex_wrap(state->wrap_s)) |
  			S_03C000_CLAMP_Y(r600_tex_wrap(state->wrap_t)) |
  			S_03C000_CLAMP_Z(r600_tex_wrap(state->wrap_r)) |
-			S_03C000_XY_MAG_FILTER(r600_tex_filter(state->mag_img_filter)) |
-			S_03C000_XY_MIN_FILTER(r600_tex_filter(state->min_img_filter)) |
+			S_03C000_XY_MAG_FILTER(r600_tex_filter(state->mag_img_filter) |  
aniso_flag_offset) |
+			S_03C000_XY_MIN_FILTER(r600_tex_filter(state->min_img_filter) |  
aniso_flag_offset) |
  			S_03C000_MIP_FILTER(r600_tex_mipfilter(state->min_mip_filter)) |
+			S_03C000_ANISO(r600_tex_aniso_filter(state->max_anisotropy)) |
  			S_03C000_DEPTH_COMPARE_FUNCTION(r600_tex_compare(state->compare_func)) |
  			S_03C000_BORDER_COLOR_TYPE(uc.ui ?  
V_03C000_SQ_TEX_BORDER_COLOR_REGISTER : 0), 0xFFFFFFFF, NULL);
  	r600_pipe_state_add_reg(rstate, R_03C004_SQ_TEX_SAMPLER_WORD1_0,
@@ -492,7 +505,8 @@ static struct pipe_sampler_view  
*r600_create_sampler_view(struct pipe_context *c
  				S_038014_BASE_ARRAY(state->u.tex.first_layer) |
  				S_038014_LAST_ARRAY(state->u.tex.last_layer), 0xFFFFFFFF, NULL);
  	r600_pipe_state_add_reg(rstate, R_038018_RESOURCE0_WORD6,
-				S_038018_TYPE(V_038010_SQ_TEX_VTX_VALID_TEXTURE), 0xFFFFFFFF, NULL);
+				S_038018_TYPE(V_038010_SQ_TEX_VTX_VALID_TEXTURE) |
+				S_038018_ANISO(4 /* max 16 samples */), 0xFFFFFFFF, NULL);

  	return &resource->base;
  }
diff --git a/src/gallium/drivers/r600/r600d.h  
b/src/gallium/drivers/r600/r600d.h
index 8296b52..c997462 100644
--- a/src/gallium/drivers/r600/r600d.h
+++ b/src/gallium/drivers/r600/r600d.h
@@ -1012,6 +1012,9 @@
  #define   S_038018_MPEG_CLAMP(x)                       (((x) & 0x3) << 0)
  #define   G_038018_MPEG_CLAMP(x)                       (((x) >> 0) & 0x3)
  #define   C_038018_MPEG_CLAMP                          0xFFFFFFFC
+#define   S_038018_ANISO(x)                            (((x) & 0x7) << 2)
+#define   G_038018_ANISO(x)                            (((x) >> 2) & 0x7)
+#define   C_038018_ANISO                               0xFFFFFFE3
  #define   S_038018_PERF_MODULATION(x)                  (((x) & 0x7) << 5)
  #define   G_038018_PERF_MODULATION(x)                  (((x) >> 5) & 0x7)
  #define   C_038018_PERF_MODULATION                     0xFFFFFF1F
@@ -1090,6 +1093,9 @@
  #define   S_03C000_MIP_FILTER(x)                       (((x) & 0x3) << 17)
  #define   G_03C000_MIP_FILTER(x)                       (((x) >> 17) & 0x3)
  #define   C_03C000_MIP_FILTER                          0xFFF9FFFF
+#define   S_03C000_ANISO(x)                            (((x) & 0x7) << 19)
+#define   G_03C000_ANISO(x)                            (((x) >> 19) & 0x7)
+#define   C_03C000_ANISO                               0xFFB7FFFF
  #define   S_03C000_BORDER_COLOR_TYPE(x)                (((x) & 0x3) << 22)
  #define   G_03C000_BORDER_COLOR_TYPE(x)                (((x) >> 22) & 0x3)
  #define   C_03C000_BORDER_COLOR_TYPE                   0xFF3FFFFF
@@ -1152,6 +1158,9 @@
  #define   S_03C008_PERF_Z(x)                           (((x) & 0x3) << 18)
  #define   G_03C008_PERF_Z(x)                           (((x) >> 18) & 0x3)
  #define   C_03C008_PERF_Z                              0xFFF3FFFF
+#define   S_03C008_ANISO_BIAS(x)                       (((x) & 0x3f) << 22)
+#define   G_03C008_ANISO_BIAS(x)                       (((x) >> 22) & 0x3f)
+#define   C_03C008_ANISO_BIAS                          (~(0x3f << 22))
  #define   S_03C008_FETCH_4(x)                          (((x) & 0x1) << 26)
  #define   G_03C008_FETCH_4(x)                          (((x) >> 26) & 0x1)
  #define   C_03C008_FETCH_4                             0xFBFFFFFF
-- 
1.7.1