llvmpipe: Remove lp_tex_sample_c.c again.

Popped back to life in some merge. Not necessary even as a reference,
since it is identical to softpipe's sp_tex_sample.c with renamed symbols.

1 files changed, 0 insertions, 1712 deletions

diff --git a/src/gallium/drivers/llvmpipe/lp_tex_sample_c.c b/src/gallium/drivers/llvmpipe/lp_tex_sample_c.c
deleted file mode 100644
index d1f5d9505d..0000000000
--- a/src/gallium/drivers/llvmpipe/lp_tex_sample_c.c
+++ /dev/null
@@ -1,1712 +0,0 @@
-/**************************************************************************
- * 
- * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
- * All Rights Reserved.
- * Copyright 2008 VMware, Inc.  All rights reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, sub license, and/or sell copies of the Software, and to
- * permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- * 
- * The above copyright notice and this permission notice (including the
- * next paragraph) shall be included in all copies or substantial portions
- * of the Software.
- * 
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
- * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
- * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
- * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
- * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- * 
- **************************************************************************/
-
-/**
- * Texture sampling
- *
- * Authors:
- *   Brian Paul
- */
-
-#include "lp_context.h"
-#include "lp_quad.h"
-#include "lp_texture.h"
-#include "lp_tex_sample.h"
-#include "lp_tex_cache.h"
-#include "pipe/p_context.h"
-#include "pipe/p_defines.h"
-#include "pipe/p_shader_tokens.h"
-#include "util/u_math.h"
-#include "util/u_memory.h"
-
-
-
-/*
- * Note, the FRAC macro has to work perfectly.  Otherwise you'll sometimes
- * see 1-pixel bands of improperly weighted linear-filtered textures.
- * The tests/texwrap.c demo is a good test.
- * Also note, FRAC(x) doesn't truly return the fractional part of x for x < 0.
- * Instead, if x < 0 then FRAC(x) = 1 - true_frac(x).
- */
-#define FRAC(f)  ((f) - util_ifloor(f))
-
-
-/**
- * Linear interpolation macro
- */
-static INLINE float
-lerp(float a, float v0, float v1)
-{
-   return v0 + a * (v1 - v0);
-}
-
-
-/**
- * Do 2D/biliner interpolation of float values.
- * v00, v10, v01 and v11 are typically four texture samples in a square/box.
- * a and b are the horizontal and vertical interpolants.
- * It's important that this function is inlined when compiled with
- * optimization!  If we find that's not true on some systems, convert
- * to a macro.
- */
-static INLINE float
-lerp_2d(float a, float b,
-        float v00, float v10, float v01, float v11)
-{
-   const float temp0 = lerp(a, v00, v10);
-   const float temp1 = lerp(a, v01, v11);
-   return lerp(b, temp0, temp1);
-}
-
-
-/**
- * As above, but 3D interpolation of 8 values.
- */
-static INLINE float
-lerp_3d(float a, float b, float c,
-        float v000, float v100, float v010, float v110,
-        float v001, float v101, float v011, float v111)
-{
-   const float temp0 = lerp_2d(a, b, v000, v100, v010, v110);
-   const float temp1 = lerp_2d(a, b, v001, v101, v011, v111);
-   return lerp(c, temp0, temp1);
-}
-
-
-
-/**
- * If A is a signed integer, A % B doesn't give the right value for A < 0
- * (in terms of texture repeat).  Just casting to unsigned fixes that.
- */
-#define REMAINDER(A, B) ((unsigned) (A) % (unsigned) (B))
-
-
-/**
- * Apply texture coord wrapping mode and return integer texture indexes
- * for a vector of four texcoords (S or T or P).
- * \param wrapMode  PIPE_TEX_WRAP_x
- * \param s  the incoming texcoords
- * \param size  the texture image size
- * \param icoord  returns the integer texcoords
- * \return  integer texture index
- */
-static INLINE void
-nearest_texcoord_4(unsigned wrapMode, const float s[4], unsigned size,
-                   int icoord[4])
-{
-   uint ch;
-   switch (wrapMode) {
-   case PIPE_TEX_WRAP_REPEAT:
-      /* s limited to [0,1) */
-      /* i limited to [0,size-1] */
-      for (ch = 0; ch < 4; ch++) {
-         int i = util_ifloor(s[ch] * size);
-         icoord[ch] = REMAINDER(i, size);
-      }
-      return;
-   case PIPE_TEX_WRAP_CLAMP:
-      /* s limited to [0,1] */
-      /* i limited to [0,size-1] */
-      for (ch = 0; ch < 4; ch++) {
-         if (s[ch] <= 0.0F)
-            icoord[ch] = 0;
-         else if (s[ch] >= 1.0F)
-            icoord[ch] = size - 1;
-         else
-            icoord[ch] = util_ifloor(s[ch] * size);
-      }
-      return;
-   case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
-      {
-         /* s limited to [min,max] */
-         /* i limited to [0, size-1] */
-         const float min = 1.0F / (2.0F * size);
-         const float max = 1.0F - min;
-         for (ch = 0; ch < 4; ch++) {
-            if (s[ch] < min)
-               icoord[ch] = 0;
-            else if (s[ch] > max)
-               icoord[ch] = size - 1;
-            else
-               icoord[ch] = util_ifloor(s[ch] * size);
-         }
-      }
-      return;
-   case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
-      {
-         /* s limited to [min,max] */
-         /* i limited to [-1, size] */
-         const float min = -1.0F / (2.0F * size);
-         const float max = 1.0F - min;
-         for (ch = 0; ch < 4; ch++) {
-            if (s[ch] <= min)
-               icoord[ch] = -1;
-            else if (s[ch] >= max)
-               icoord[ch] = size;
-            else
-               icoord[ch] = util_ifloor(s[ch] * size);
-         }
-      }
-      return;
-   case PIPE_TEX_WRAP_MIRROR_REPEAT:
-      {
-         const float min = 1.0F / (2.0F * size);
-         const float max = 1.0F - min;
-         for (ch = 0; ch < 4; ch++) {
-            const int flr = util_ifloor(s[ch]);
-            float u;
-            if (flr & 1)
-               u = 1.0F - (s[ch] - (float) flr);
-            else
-               u = s[ch] - (float) flr;
-            if (u < min)
-               icoord[ch] = 0;
-            else if (u > max)
-               icoord[ch] = size - 1;
-            else
-               icoord[ch] = util_ifloor(u * size);
-         }
-      }
-      return;
-   case PIPE_TEX_WRAP_MIRROR_CLAMP:
-      for (ch = 0; ch < 4; ch++) {
-         /* s limited to [0,1] */
-         /* i limited to [0,size-1] */
-         const float u = fabsf(s[ch]);
-         if (u <= 0.0F)
-            icoord[ch] = 0;
-         else if (u >= 1.0F)
-            icoord[ch] = size - 1;
-         else
-            icoord[ch] = util_ifloor(u * size);
-      }
-      return;
-   case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
-      {
-         /* s limited to [min,max] */
-         /* i limited to [0, size-1] */
-         const float min = 1.0F / (2.0F * size);
-         const float max = 1.0F - min;
-         for (ch = 0; ch < 4; ch++) {
-            const float u = fabsf(s[ch]);
-            if (u < min)
-               icoord[ch] = 0;
-            else if (u > max)
-               icoord[ch] = size - 1;
-            else
-               icoord[ch] = util_ifloor(u * size);
-         }
-      }
-      return;
-   case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
-      {
-         /* s limited to [min,max] */
-         /* i limited to [0, size-1] */
-         const float min = -1.0F / (2.0F * size);
-         const float max = 1.0F - min;
-         for (ch = 0; ch < 4; ch++) {
-            const float u = fabsf(s[ch]);
-            if (u < min)
-               icoord[ch] = -1;
-            else if (u > max)
-               icoord[ch] = size;
-            else
-               icoord[ch] = util_ifloor(u * size);
-         }
-      }
-      return;
-   default:
-      assert(0);
-   }
-}
-
-
-/**
- * Used to compute texel locations for linear sampling for four texcoords.
- * \param wrapMode  PIPE_TEX_WRAP_x
- * \param s  the texcoords
- * \param size  the texture image size
- * \param icoord0  returns first texture indexes
- * \param icoord1  returns second texture indexes (usually icoord0 + 1)
- * \param w  returns blend factor/weight between texture indexes
- * \param icoord  returns the computed integer texture coords
- */
-static INLINE void
-linear_texcoord_4(unsigned wrapMode, const float s[4], unsigned size,
-                  int icoord0[4], int icoord1[4], float w[4])
-{
-   uint ch;
-
-   switch (wrapMode) {
-   case PIPE_TEX_WRAP_REPEAT:
-      for (ch = 0; ch < 4; ch++) {
-         float u = s[ch] * size - 0.5F;
-         icoord0[ch] = REMAINDER(util_ifloor(u), size);
-         icoord1[ch] = REMAINDER(icoord0[ch] + 1, size);
-         w[ch] = FRAC(u);
-      }
-      break;;
-   case PIPE_TEX_WRAP_CLAMP:
-      for (ch = 0; ch < 4; ch++) {
-         float u = CLAMP(s[ch], 0.0F, 1.0F);
-         u = u * size - 0.5f;
-         icoord0[ch] = util_ifloor(u);
-         icoord1[ch] = icoord0[ch] + 1;
-         w[ch] = FRAC(u);
-      }
-      break;;
-   case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
-      for (ch = 0; ch < 4; ch++) {
-         float u = CLAMP(s[ch], 0.0F, 1.0F);
-         u = u * size - 0.5f;
-         icoord0[ch] = util_ifloor(u);
-         icoord1[ch] = icoord0[ch] + 1;
-         if (icoord0[ch] < 0)
-            icoord0[ch] = 0;
-         if (icoord1[ch] >= (int) size)
-            icoord1[ch] = size - 1;
-         w[ch] = FRAC(u);
-      }
-      break;;
-   case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
-      {
-         const float min = -1.0F / (2.0F * size);
-         const float max = 1.0F - min;
-         for (ch = 0; ch < 4; ch++) {
-            float u = CLAMP(s[ch], min, max);
-            u = u * size - 0.5f;
-            icoord0[ch] = util_ifloor(u);
-            icoord1[ch] = icoord0[ch] + 1;
-            w[ch] = FRAC(u);
-         }
-      }
-      break;;
-   case PIPE_TEX_WRAP_MIRROR_REPEAT:
-      for (ch = 0; ch < 4; ch++) {
-         const int flr = util_ifloor(s[ch]);
-         float u;
-         if (flr & 1)
-            u = 1.0F - (s[ch] - (float) flr);
-         else
-            u = s[ch] - (float) flr;
-         u = u * size - 0.5F;
-         icoord0[ch] = util_ifloor(u);
-         icoord1[ch] = icoord0[ch] + 1;
-         if (icoord0[ch] < 0)
-            icoord0[ch] = 0;
-         if (icoord1[ch] >= (int) size)
-            icoord1[ch] = size - 1;
-         w[ch] = FRAC(u);
-      }
-      break;;
-   case PIPE_TEX_WRAP_MIRROR_CLAMP:
-      for (ch = 0; ch < 4; ch++) {
-         float u = fabsf(s[ch]);
-         if (u >= 1.0F)
-            u = (float) size;
-         else
-            u *= size;
-         u -= 0.5F;
-         icoord0[ch] = util_ifloor(u);
-         icoord1[ch] = icoord0[ch] + 1;
-         w[ch] = FRAC(u);
-      }
-      break;;
-   case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
-      for (ch = 0; ch < 4; ch++) {
-         float u = fabsf(s[ch]);
-         if (u >= 1.0F)
-            u = (float) size;
-         else
-            u *= size;
-         u -= 0.5F;
-         icoord0[ch] = util_ifloor(u);
-         icoord1[ch] = icoord0[ch] + 1;
-         if (icoord0[ch] < 0)
-            icoord0[ch] = 0;
-         if (icoord1[ch] >= (int) size)
-            icoord1[ch] = size - 1;
-         w[ch] = FRAC(u);
-      }
-      break;;
-   case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
-      {
-         const float min = -1.0F / (2.0F * size);
-         const float max = 1.0F - min;
-         for (ch = 0; ch < 4; ch++) {
-            float u = fabsf(s[ch]);
-            if (u <= min)
-               u = min * size;
-            else if (u >= max)
-               u = max * size;
-            else
-               u *= size;
-            u -= 0.5F;
-            icoord0[ch] = util_ifloor(u);
-            icoord1[ch] = icoord0[ch] + 1;
-            w[ch] = FRAC(u);
-         }
-      }
-      break;;
-   default:
-      assert(0);
-   }
-}
-
-
-/**
- * For RECT textures / unnormalized texcoords
- * Only a subset of wrap modes supported.
- */
-static INLINE void
-nearest_texcoord_unnorm_4(unsigned wrapMode, const float s[4], unsigned size,
-                          int icoord[4])
-{
-   uint ch;
-   switch (wrapMode) {
-   case PIPE_TEX_WRAP_CLAMP:
-      for (ch = 0; ch < 4; ch++) {
-         int i = util_ifloor(s[ch]);
-         icoord[ch]= CLAMP(i, 0, (int) size-1);
-      }
-      return;
-   case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
-      /* fall-through */
-   case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
-      for (ch = 0; ch < 4; ch++) {
-         icoord[ch]= util_ifloor( CLAMP(s[ch], 0.5F, (float) size - 0.5F) );
-      }
-      return;
-   default:
-      assert(0);
-   }
-}
-
-
-/**
- * For RECT textures / unnormalized texcoords.
- * Only a subset of wrap modes supported.
- */
-static INLINE void
-linear_texcoord_unnorm_4(unsigned wrapMode, const float s[4], unsigned size,
-                         int icoord0[4], int icoord1[4], float w[4])
-{
-   uint ch;
-   switch (wrapMode) {
-   case PIPE_TEX_WRAP_CLAMP:
-      for (ch = 0; ch < 4; ch++) {
-         /* Not exactly what the spec says, but it matches NVIDIA output */
-         float u = CLAMP(s[ch] - 0.5F, 0.0f, (float) size - 1.0f);
-         icoord0[ch] = util_ifloor(u);
-         icoord1[ch] = icoord0[ch] + 1;
-         w[ch] = FRAC(u);
-      }
-      return;
-   case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
-      /* fall-through */
-   case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
-      for (ch = 0; ch < 4; ch++) {
-         float u = CLAMP(s[ch], 0.5F, (float) size - 0.5F);
-         u -= 0.5F;
-         icoord0[ch] = util_ifloor(u);
-         icoord1[ch] = icoord0[ch] + 1;
-         if (icoord1[ch] > (int) size - 1)
-            icoord1[ch] = size - 1;
-         w[ch] = FRAC(u);
-      }
-      break;
-   default:
-      assert(0);
-   }
-}
-
-
-static unsigned
-choose_cube_face(float rx, float ry, float rz, float *newS, float *newT)
-{
-   /*
-      major axis
-      direction     target                             sc     tc    ma
-      ----------    -------------------------------    ---    ---   ---
-       +rx          TEXTURE_CUBE_MAP_POSITIVE_X_EXT    -rz    -ry   rx
-       -rx          TEXTURE_CUBE_MAP_NEGATIVE_X_EXT    +rz    -ry   rx
-       +ry          TEXTURE_CUBE_MAP_POSITIVE_Y_EXT    +rx    +rz   ry
-       -ry          TEXTURE_CUBE_MAP_NEGATIVE_Y_EXT    +rx    -rz   ry
-       +rz          TEXTURE_CUBE_MAP_POSITIVE_Z_EXT    +rx    -ry   rz
-       -rz          TEXTURE_CUBE_MAP_NEGATIVE_Z_EXT    -rx    -ry   rz
-   */
-   const float arx = fabsf(rx), ary = fabsf(ry), arz = fabsf(rz);
-   unsigned face;
-   float sc, tc, ma;
-
-   if (arx > ary && arx > arz) {
-      if (rx >= 0.0F) {
-         face = PIPE_TEX_FACE_POS_X;
-         sc = -rz;
-         tc = -ry;
-         ma = arx;
-      }
-      else {
-         face = PIPE_TEX_FACE_NEG_X;
-         sc = rz;
-         tc = -ry;
-         ma = arx;
-      }
-   }
-   else if (ary > arx && ary > arz) {
-      if (ry >= 0.0F) {
-         face = PIPE_TEX_FACE_POS_Y;
-         sc = rx;
-         tc = rz;
-         ma = ary;
-      }
-      else {
-         face = PIPE_TEX_FACE_NEG_Y;
-         sc = rx;
-         tc = -rz;
-         ma = ary;
-      }
-   }
-   else {
-      if (rz > 0.0F) {
-         face = PIPE_TEX_FACE_POS_Z;
-         sc = rx;
-         tc = -ry;
-         ma = arz;
-      }
-      else {
-         face = PIPE_TEX_FACE_NEG_Z;
-         sc = -rx;
-         tc = -ry;
-         ma = arz;
-      }
-   }
-
-   *newS = ( sc / ma + 1.0F ) * 0.5F;
-   *newT = ( tc / ma + 1.0F ) * 0.5F;
-
-   return face;
-}
-
-
-/**
- * Examine the quad's texture coordinates to compute the partial
- * derivatives w.r.t X and Y, then compute lambda (level of detail).
- *
- * This is only done for fragment shaders, not vertex shaders.
- */
-static float
-compute_lambda(struct tgsi_sampler *tgsi_sampler,
-               const float s[QUAD_SIZE],
-               const float t[QUAD_SIZE],
-               const float p[QUAD_SIZE],
-               float lodbias)
-{
-   const struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
-   const struct pipe_texture *texture = samp->texture;
-   const struct pipe_sampler_state *sampler = samp->sampler;
-   float rho, lambda;
-
-   if (samp->processor == TGSI_PROCESSOR_VERTEX)
-      return lodbias;
-
-   assert(sampler->normalized_coords);
-
-   assert(s);
-   {
-      float dsdx = s[QUAD_BOTTOM_RIGHT] - s[QUAD_BOTTOM_LEFT];
-      float dsdy = s[QUAD_TOP_LEFT]     - s[QUAD_BOTTOM_LEFT];
-      dsdx = fabsf(dsdx);
-      dsdy = fabsf(dsdy);
-      rho = MAX2(dsdx, dsdy) * texture->width[0];
-   }
-   if (t) {
-      float dtdx = t[QUAD_BOTTOM_RIGHT] - t[QUAD_BOTTOM_LEFT];
-      float dtdy = t[QUAD_TOP_LEFT]     - t[QUAD_BOTTOM_LEFT];
-      float max;
-      dtdx = fabsf(dtdx);
-      dtdy = fabsf(dtdy);
-      max = MAX2(dtdx, dtdy) * texture->height[0];
-      rho = MAX2(rho, max);
-   }
-   if (p) {
-      float dpdx = p[QUAD_BOTTOM_RIGHT] - p[QUAD_BOTTOM_LEFT];
-      float dpdy = p[QUAD_TOP_LEFT]     - p[QUAD_BOTTOM_LEFT];
-      float max;
-      dpdx = fabsf(dpdx);
-      dpdy = fabsf(dpdy);
-      max = MAX2(dpdx, dpdy) * texture->depth[0];
-      rho = MAX2(rho, max);
-   }
-
-   lambda = util_fast_log2(rho);
-   lambda += lodbias + sampler->lod_bias;
-   lambda = CLAMP(lambda, sampler->min_lod, sampler->max_lod);
-
-   return lambda;
-}
-
-
-/**
- * Do several things here:
- * 1. Compute lambda from the texcoords, if needed
- * 2. Determine if we're minifying or magnifying
- * 3. If minifying, choose mipmap levels
- * 4. Return image filter to use within mipmap images
- * \param level0  Returns first mipmap level to sample from
- * \param level1  Returns second mipmap level to sample from
- * \param levelBlend  Returns blend factor between levels, in [0,1]
- * \param imgFilter  Returns either the min or mag filter, depending on lambda
- */
-static void
-choose_mipmap_levels(struct tgsi_sampler *tgsi_sampler,
-                     const float s[QUAD_SIZE],
-                     const float t[QUAD_SIZE],
-                     const float p[QUAD_SIZE],
-                     float lodbias,
-                     unsigned *level0, unsigned *level1, float *levelBlend,
-                     unsigned *imgFilter)
-{
-   const struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
-   const struct pipe_texture *texture = samp->texture;
-   const struct pipe_sampler_state *sampler = samp->sampler;
-
-   if (sampler->min_mip_filter == PIPE_TEX_MIPFILTER_NONE) {
-      /* no mipmap selection needed */
-      *level0 = *level1 = CLAMP((int) sampler->min_lod,
-                                0, (int) texture->last_level);
-
-      if (sampler->min_img_filter != sampler->mag_img_filter) {
-         /* non-mipmapped texture, but still need to determine if doing
-          * minification or magnification.
-          */
-         float lambda = compute_lambda(tgsi_sampler, s, t, p, lodbias);
-         if (lambda <= 0.0) {
-            *imgFilter = sampler->mag_img_filter;
-         }
-         else {
-            *imgFilter = sampler->min_img_filter;
-         }
-      }
-      else {
-         *imgFilter = sampler->mag_img_filter;
-      }
-   }
-   else {
-      float lambda = compute_lambda(tgsi_sampler, s, t, p, lodbias);
-
-      if (lambda <= 0.0) { /* XXX threshold depends on the filter */
-         /* magnifying */
-         *imgFilter = sampler->mag_img_filter;
-         *level0 = *level1 = 0;
-      }
-      else {
-         /* minifying */
-         *imgFilter = sampler->min_img_filter;
-
-         /* choose mipmap level(s) and compute the blend factor between them */
-         if (sampler->min_mip_filter == PIPE_TEX_MIPFILTER_NEAREST) {
-            /* Nearest mipmap level */
-            const int lvl = (int) (lambda + 0.5);
-            *level0 =
-            *level1 = CLAMP(lvl, 0, (int) texture->last_level);
-         }
-         else {
-            /* Linear interpolation between mipmap levels */
-            const int lvl = (int) lambda;
-            *level0 = CLAMP(lvl,     0, (int) texture->last_level);
-            *level1 = CLAMP(lvl + 1, 0, (int) texture->last_level);
-            *levelBlend = FRAC(lambda);  /* blending weight between levels */
-         }
-      }
-   }
-}
-
-
-/**
- * Get a texel from a texture, using the texture tile cache.
- *
- * \param face  the cube face in 0..5
- * \param level  the mipmap level
- * \param x  the x coord of texel within 2D image
- * \param y  the y coord of texel within 2D image
- * \param z  which slice of a 3D texture
- * \param rgba  the quad to put the texel/color into
- * \param j  which element of the rgba quad to write to
- *
- * XXX maybe move this into lp_tile_cache.c and merge with the
- * lp_get_cached_tile_tex() function.  Also, get 4 texels instead of 1...
- */
-static void
-get_texel_quad_2d(const struct tgsi_sampler *tgsi_sampler,
-                  unsigned face, unsigned level, int x, int y, 
-                  const uint8_t *out[4])
-{
-   const struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
-
-   const struct llvmpipe_cached_tex_tile *tile
-      = lp_get_cached_tex_tile(samp->cache,
-                               tex_tile_address(x, y, 0, face, level));
-
-   y %= TEX_TILE_SIZE;
-   x %= TEX_TILE_SIZE;
-      
-   out[0] = &tile->color[y  ][x  ][0];
-   out[1] = &tile->color[y  ][x+1][0];
-   out[2] = &tile->color[y+1][x  ][0];
-   out[3] = &tile->color[y+1][x+1][0];
-}
-
-static INLINE const uint8_t *
-get_texel_2d_ptr(const struct tgsi_sampler *tgsi_sampler,
-                 unsigned face, unsigned level, int x, int y)
-{
-   const struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
-
-   const struct llvmpipe_cached_tex_tile *tile
-      = lp_get_cached_tex_tile(samp->cache,
-                               tex_tile_address(x, y, 0, face, level));
-
-   y %= TEX_TILE_SIZE;
-   x %= TEX_TILE_SIZE;
-
-   return &tile->color[y][x][0];
-}
-
-
-static void
-get_texel_quad_2d_mt(const struct tgsi_sampler *tgsi_sampler,
-                     unsigned face, unsigned level, 
-                     int x0, int y0, 
-                     int x1, int y1,
-                     const uint8_t *out[4])
-{
-   unsigned i;
-
-   for (i = 0; i < 4; i++) {
-      unsigned tx = (i & 1) ? x1 : x0;
-      unsigned ty = (i >> 1) ? y1 : y0;
-
-      out[i] = get_texel_2d_ptr( tgsi_sampler, face, level, tx, ty );
-   }
-}
-
-static void
-get_texel(const struct tgsi_sampler *tgsi_sampler,
-                 unsigned face, unsigned level, int x, int y, int z,
-                 float rgba[NUM_CHANNELS][QUAD_SIZE], unsigned j)
-{
-   const struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
-   const struct pipe_texture *texture = samp->texture;
-   const struct pipe_sampler_state *sampler = samp->sampler;
-
-   if (x < 0 || x >= (int) texture->width[level] ||
-       y < 0 || y >= (int) texture->height[level] ||
-       z < 0 || z >= (int) texture->depth[level]) {
-      rgba[0][j] = sampler->border_color[0];
-      rgba[1][j] = sampler->border_color[1];
-      rgba[2][j] = sampler->border_color[2];
-      rgba[3][j] = sampler->border_color[3];
-   }
-   else {
-      const unsigned tx = x % TEX_TILE_SIZE;
-      const unsigned ty = y % TEX_TILE_SIZE;
-      const struct llvmpipe_cached_tex_tile *tile;
-
-      tile = lp_get_cached_tex_tile(samp->cache,
-                                    tex_tile_address(x, y, z, face, level));
-
-      rgba[0][j] = ubyte_to_float(tile->color[ty][tx][0]);
-      rgba[1][j] = ubyte_to_float(tile->color[ty][tx][1]);
-      rgba[2][j] = ubyte_to_float(tile->color[ty][tx][2]);
-      rgba[3][j] = ubyte_to_float(tile->color[ty][tx][3]);
-      if (0)
-      {
-         debug_printf("Get texel %f %f %f %f from %s\n",
-                      rgba[0][j], rgba[1][j], rgba[2][j], rgba[3][j],
-                      pf_name(texture->format));
-      }
-   }
-}
-
-
-/**
- * Compare texcoord 'p' (aka R) against texture value 'rgba[0]'
- * When we sampled the depth texture, the depth value was put into all
- * RGBA channels.  We look at the red channel here.
- * \param rgba  quad of (depth) texel values
- * \param p  texture 'P' components for four pixels in quad
- * \param j  which pixel in the quad to test [0..3]
- */
-static INLINE void
-shadow_compare(const struct pipe_sampler_state *sampler,
-               float rgba[NUM_CHANNELS][QUAD_SIZE],
-               const float p[QUAD_SIZE],
-               uint j)
-{
-   int k;
-   switch (sampler->compare_func) {
-   case PIPE_FUNC_LESS:
-      k = p[j] < rgba[0][j];
-      break;
-   case PIPE_FUNC_LEQUAL:
-      k = p[j] <= rgba[0][j];
-      break;
-   case PIPE_FUNC_GREATER:
-      k = p[j] > rgba[0][j];
-      break;
-   case PIPE_FUNC_GEQUAL:
-      k = p[j] >= rgba[0][j];
-      break;
-   case PIPE_FUNC_EQUAL:
-      k = p[j] == rgba[0][j];
-      break;
-   case PIPE_FUNC_NOTEQUAL:
-      k = p[j] != rgba[0][j];
-      break;
-   case PIPE_FUNC_ALWAYS:
-      k = 1;
-      break;
-   case PIPE_FUNC_NEVER:
-      k = 0;
-      break;
-   default:
-      k = 0;
-      assert(0);
-      break;
-   }
-
-   /* XXX returning result for default GL_DEPTH_TEXTURE_MODE = GL_LUMINANCE */
-   rgba[0][j] = rgba[1][j] = rgba[2][j] = (float) k;
-   rgba[3][j] = 1.0F;
-}
-
-
-/**
- * As above, but do four z/texture comparisons.
- */
-static INLINE void
-shadow_compare4(const struct pipe_sampler_state *sampler,
-                float rgba[NUM_CHANNELS][QUAD_SIZE],
-                const float p[QUAD_SIZE])
-{
-   int j, k0, k1, k2, k3;
-   float val;
-
-   /* compare four texcoords vs. four texture samples */
-   switch (sampler->compare_func) {
-   case PIPE_FUNC_LESS:
-      k0 = p[0] < rgba[0][0];
-      k1 = p[1] < rgba[0][1];
-      k2 = p[2] < rgba[0][2];
-      k3 = p[3] < rgba[0][3];
-      break;
-   case PIPE_FUNC_LEQUAL:
-      k0 = p[0] <= rgba[0][0];
-      k1 = p[1] <= rgba[0][1];
-      k2 = p[2] <= rgba[0][2];
-      k3 = p[3] <= rgba[0][3];
-      break;
-   case PIPE_FUNC_GREATER:
-      k0 = p[0] > rgba[0][0];
-      k1 = p[1] > rgba[0][1];
-      k2 = p[2] > rgba[0][2];
-      k3 = p[3] > rgba[0][3];
-      break;
-   case PIPE_FUNC_GEQUAL:
-      k0 = p[0] >= rgba[0][0];
-      k1 = p[1] >= rgba[0][1];
-      k2 = p[2] >= rgba[0][2];
-      k3 = p[3] >= rgba[0][3];
-      break;
-   case PIPE_FUNC_EQUAL:
-      k0 = p[0] == rgba[0][0];
-      k1 = p[1] == rgba[0][1];
-      k2 = p[2] == rgba[0][2];
-      k3 = p[3] == rgba[0][3];
-      break;
-   case PIPE_FUNC_NOTEQUAL:
-      k0 = p[0] != rgba[0][0];
-      k1 = p[1] != rgba[0][1];
-      k2 = p[2] != rgba[0][2];
-      k3 = p[3] != rgba[0][3];
-      break;
-   case PIPE_FUNC_ALWAYS:
-      k0 = k1 = k2 = k3 = 1;
-      break;
-   case PIPE_FUNC_NEVER:
-      k0 = k1 = k2 = k3 = 0;
-      break;
-   default:
-      k0 = k1 = k2 = k3 = 0;
-      assert(0);
-      break;
-   }
-
-   /* convert four pass/fail values to an intensity in [0,1] */
-   val = 0.25F * (k0 + k1 + k2 + k3);
-
-   /* XXX returning result for default GL_DEPTH_TEXTURE_MODE = GL_LUMINANCE */
-   for (j = 0; j < 4; j++) {
-      rgba[0][j] = rgba[1][j] = rgba[2][j] = val;
-      rgba[3][j] = 1.0F;
-   }
-}
-
-
-
-static void
-lp_get_samples_2d_linear_repeat_POT(struct tgsi_sampler *tgsi_sampler,
-                                    const float s[QUAD_SIZE],
-                                    const float t[QUAD_SIZE],
-                                    const float p[QUAD_SIZE],
-                                    float lodbias,
-                                    float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
-   const struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
-   unsigned  j;
-   unsigned level = samp->level;
-   unsigned xpot = 1 << (samp->xpot - level);
-   unsigned ypot = 1 << (samp->ypot - level);
-   unsigned xmax = (xpot - 1) & (TEX_TILE_SIZE - 1); /* MIN2(TEX_TILE_SIZE, xpot) - 1; */
-   unsigned ymax = (ypot - 1) & (TEX_TILE_SIZE - 1); /* MIN2(TEX_TILE_SIZE, ypot) - 1; */
-      
-   for (j = 0; j < QUAD_SIZE; j++) {
-      int c;
-
-      float u = s[j] * xpot - 0.5F;
-      float v = t[j] * ypot - 0.5F;
-
-      int uflr = util_ifloor(u);
-      int vflr = util_ifloor(v);
-
-      float xw = u - (float)uflr;
-      float yw = v - (float)vflr;
-
-      int x0 = uflr & (xpot - 1);
-      int y0 = vflr & (ypot - 1);
-
-      const uint8_t *tx[4];
-      
-
-      /* Can we fetch all four at once:
-       */
-      if (x0 < xmax && y0 < ymax)
-      {
-         get_texel_quad_2d(tgsi_sampler, 0, level, x0, y0, tx);
-      }
-      else 
-      {
-         unsigned x1 = (x0 + 1) & (xpot - 1);
-         unsigned y1 = (y0 + 1) & (ypot - 1);
-         get_texel_quad_2d_mt(tgsi_sampler, 0, level, 
-                              x0, y0, x1, y1, tx);
-      }
-
-
-      /* interpolate R, G, B, A */
-      for (c = 0; c < 4; c++) {
-         rgba[c][j] = lerp_2d(xw, yw, 
-                              ubyte_to_float(tx[0][c]), ubyte_to_float(tx[1][c]),
-                              ubyte_to_float(tx[2][c]), ubyte_to_float(tx[3][c]));
-      }
-   }
-}
-
-
-static void
-lp_get_samples_2d_nearest_repeat_POT(struct tgsi_sampler *tgsi_sampler,
-                                     const float s[QUAD_SIZE],
-                                     const float t[QUAD_SIZE],
-                                     const float p[QUAD_SIZE],
-                                     float lodbias,
-                                     float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
-   const struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
-   unsigned  j;
-   unsigned level = samp->level;
-   unsigned xpot = 1 << (samp->xpot - level);
-   unsigned ypot = 1 << (samp->ypot - level);
-
-   for (j = 0; j < QUAD_SIZE; j++) {
-      int c;
-
-      float u = s[j] * xpot;
-      float v = t[j] * ypot;
-
-      int uflr = util_ifloor(u);
-      int vflr = util_ifloor(v);
-
-      int x0 = uflr & (xpot - 1);
-      int y0 = vflr & (ypot - 1);
-
-      const uint8_t *out = get_texel_2d_ptr(tgsi_sampler, 0, level, x0, y0);
-
-      for (c = 0; c < 4; c++) {
-         rgba[c][j] = ubyte_to_float(out[c]);
-      }
-   }
-}
-
-
-static void
-lp_get_samples_2d_nearest_clamp_POT(struct tgsi_sampler *tgsi_sampler,
-                                     const float s[QUAD_SIZE],
-                                     const float t[QUAD_SIZE],
-                                     const float p[QUAD_SIZE],
-                                     float lodbias,
-                                     float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
-   const struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
-   unsigned  j;
-   unsigned level = samp->level;
-   unsigned xpot = 1 << (samp->xpot - level);
-   unsigned ypot = 1 << (samp->ypot - level);
-
-   for (j = 0; j < QUAD_SIZE; j++) {
-      int c;
-
-      float u = s[j] * xpot;
-      float v = t[j] * ypot;
-
-      int x0, y0;
-      const uint8_t *out;
-
-      x0 = util_ifloor(u);
-      if (x0 < 0) 
-         x0 = 0;
-      else if (x0 > xpot - 1)
-         x0 = xpot - 1;
-
-      y0 = util_ifloor(v);
-      if (y0 < 0) 
-         y0 = 0;
-      else if (y0 > ypot - 1)
-         y0 = ypot - 1;
-      
-      out = get_texel_2d_ptr(tgsi_sampler, 0, level, x0, y0);
-
-      for (c = 0; c < 4; c++) {
-         rgba[c][j] = ubyte_to_float(out[c]);
-      }
-   }
-}
-
-
-static void
-lp_get_samples_2d_linear_mip_linear_repeat_POT(struct tgsi_sampler *tgsi_sampler,
-                                               const float s[QUAD_SIZE],
-                                               const float t[QUAD_SIZE],
-                                               const float p[QUAD_SIZE],
-                                               float lodbias,
-                                               float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
-   struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
-   const struct pipe_texture *texture = samp->texture;
-   int level0;
-   float lambda;
-
-   lambda = compute_lambda(tgsi_sampler, s, t, p, lodbias);
-   level0 = (int)lambda;
-
-   if (lambda < 0.0) { 
-      samp->level = 0;
-      lp_get_samples_2d_linear_repeat_POT( tgsi_sampler,
-                                           s, t, p, 0, rgba );
-   }
-   else if (level0 >= texture->last_level) {
-      samp->level = texture->last_level;
-      lp_get_samples_2d_linear_repeat_POT( tgsi_sampler,
-                                           s, t, p, 0, rgba );
-   }
-   else {
-      float levelBlend = lambda - level0;
-      float rgba0[4][4];
-      float rgba1[4][4];
-      int c,j;
-
-      samp->level = level0;
-      lp_get_samples_2d_linear_repeat_POT( tgsi_sampler,
-                                           s, t, p, 0, rgba0 );
-
-      samp->level = level0+1;
-      lp_get_samples_2d_linear_repeat_POT( tgsi_sampler,
-                                           s, t, p, 0, rgba1 );
-
-      for (j = 0; j < QUAD_SIZE; j++) {
-         for (c = 0; c < 4; c++) {
-            rgba[c][j] = lerp(levelBlend, rgba0[c][j], rgba1[c][j]);
-         }
-      }
-   }
-}
-
-/**
- * Common code for sampling 1D/2D/cube textures.
- * Could probably extend for 3D...
- */
-static void
-lp_get_samples_2d_common(struct tgsi_sampler *tgsi_sampler,
-                         const float s[QUAD_SIZE],
-                         const float t[QUAD_SIZE],
-                         const float p[QUAD_SIZE],
-                         float lodbias,
-                         float rgba[NUM_CHANNELS][QUAD_SIZE],
-                         const unsigned faces[4])
-{
-   const struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
-   const struct pipe_texture *texture = samp->texture;
-   const struct pipe_sampler_state *sampler = samp->sampler;
-   unsigned level0, level1, j, imgFilter;
-   int width, height;
-   float levelBlend = 0.0F;
-
-   choose_mipmap_levels(tgsi_sampler, s, t, p, 
-                        lodbias,
-                        &level0, &level1, &levelBlend, &imgFilter);
-
-   assert(sampler->normalized_coords);
-
-   width = texture->width[level0];
-   height = texture->height[level0];
-
-   assert(width > 0);
-
-   switch (imgFilter) {
-   case PIPE_TEX_FILTER_NEAREST:
-      {
-         int x[4], y[4];
-         nearest_texcoord_4(sampler->wrap_s, s, width, x);
-         nearest_texcoord_4(sampler->wrap_t, t, height, y);
-
-         for (j = 0; j < QUAD_SIZE; j++) {
-            get_texel(tgsi_sampler, faces[j], level0, x[j], y[j], 0, rgba, j);
-            if (sampler->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE) {
-               shadow_compare(sampler, rgba, p, j);
-            }
-
-            if (level0 != level1) {
-               /* get texels from second mipmap level and blend */
-               float rgba2[4][4];
-               unsigned c;
-               x[j] /= 2;
-               y[j] /= 2;
-               get_texel(tgsi_sampler, faces[j], level1, x[j], y[j], 0,
-                         rgba2, j);
-               if (sampler->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE){
-                  shadow_compare(sampler, rgba2, p, j);
-               }
-
-               for (c = 0; c < NUM_CHANNELS; c++) {
-                  rgba[c][j] = lerp(levelBlend, rgba[c][j], rgba2[c][j]);
-               }
-            }
-         }
-      }
-      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 */
-
-         linear_texcoord_4(sampler->wrap_s, s, width, x0, x1, xw);
-         linear_texcoord_4(sampler->wrap_t, t, height, y0, y1, yw);
-
-         for (j = 0; j < QUAD_SIZE; j++) {
-            float tx[4][4]; /* texels */
-            int c;
-            get_texel(tgsi_sampler, faces[j], level0, x0[j], y0[j], 0, tx, 0);
-            get_texel(tgsi_sampler, faces[j], level0, x1[j], y0[j], 0, tx, 1);
-            get_texel(tgsi_sampler, faces[j], level0, x0[j], y1[j], 0, tx, 2);
-            get_texel(tgsi_sampler, faces[j], level0, x1[j], y1[j], 0, tx, 3);
-            if (sampler->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE) {
-               shadow_compare4(sampler, tx, p);
-            }
-
-            /* interpolate R, G, B, A */
-            for (c = 0; c < 4; c++) {
-               rgba[c][j] = lerp_2d(xw[j], yw[j],
-                                    tx[c][0], tx[c][1],
-                                    tx[c][2], tx[c][3]);
-            }
-
-            if (level0 != level1) {
-               /* get texels from second mipmap level and blend */
-               float rgba2[4][4];
-
-               /* XXX: This is incorrect -- will often end up with (x0
-                *  == x1 && y0 == y1), meaning that we fetch the same
-                *  texel four times and linearly interpolate between
-                *  identical values.  The correct approach would be to
-                *  call linear_texcoord again for the second level.
-                */
-               x0[j] /= 2;
-               y0[j] /= 2;
-               x1[j] /= 2;
-               y1[j] /= 2;
-               get_texel(tgsi_sampler, faces[j], level1, x0[j], y0[j], 0, tx, 0);
-               get_texel(tgsi_sampler, faces[j], level1, x1[j], y0[j], 0, tx, 1);
-               get_texel(tgsi_sampler, faces[j], level1, x0[j], y1[j], 0, tx, 2);
-               get_texel(tgsi_sampler, faces[j], level1, x1[j], y1[j], 0, tx, 3);
-               if (sampler->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE){
-                  shadow_compare4(sampler, tx, p);
-               }
-
-               /* interpolate R, G, B, A */
-               for (c = 0; c < 4; c++) {
-                  rgba2[c][j] = lerp_2d(xw[j], yw[j],
-                                        tx[c][0], tx[c][1], tx[c][2], tx[c][3]);
-               }
-
-               for (c = 0; c < NUM_CHANNELS; c++) {
-                  rgba[c][j] = lerp(levelBlend, rgba[c][j], rgba2[c][j]);
-               }
-            }
-         }
-      }
-      break;
-   default:
-      assert(0);
-   }
-}
-
-
-static INLINE void
-lp_get_samples_1d(struct tgsi_sampler *sampler,
-                  const float s[QUAD_SIZE],
-                  const float t[QUAD_SIZE],
-                  const float p[QUAD_SIZE],
-                  float lodbias,
-                  float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
-   static const unsigned faces[4] = {0, 0, 0, 0};
-   static const float tzero[4] = {0, 0, 0, 0};
-   lp_get_samples_2d_common(sampler, s, tzero, NULL,
-                            lodbias, rgba, faces);
-}
-
-
-static INLINE void
-lp_get_samples_2d(struct tgsi_sampler *sampler,
-                  const float s[QUAD_SIZE],
-                  const float t[QUAD_SIZE],
-                  const float p[QUAD_SIZE],
-                  float lodbias,
-                  float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
-   static const unsigned faces[4] = {0, 0, 0, 0};
-   lp_get_samples_2d_common(sampler, s, t, p,
-                            lodbias, rgba, faces);
-}
-
-
-static INLINE void
-lp_get_samples_3d(struct tgsi_sampler *tgsi_sampler,
-                  const float s[QUAD_SIZE],
-                  const float t[QUAD_SIZE],
-                  const float p[QUAD_SIZE],
-                  float lodbias,
-                  float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
-   const struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
-   const struct pipe_texture *texture = samp->texture;
-   const struct pipe_sampler_state *sampler = samp->sampler;
-   /* get/map pipe_surfaces corresponding to 3D tex slices */
-   unsigned level0, level1, j, imgFilter;
-   int width, height, depth;
-   float levelBlend;
-   const uint face = 0;
-
-   choose_mipmap_levels(tgsi_sampler, s, t, p, 
-                        lodbias,
-                        &level0, &level1, &levelBlend, &imgFilter);
-
-   assert(sampler->normalized_coords);
-
-   width = texture->width[level0];
-   height = texture->height[level0];
-   depth = texture->depth[level0];
-
-   assert(width > 0);
-   assert(height > 0);
-   assert(depth > 0);
-
-   switch (imgFilter) {
-   case PIPE_TEX_FILTER_NEAREST:
-      {
-         int x[4], y[4], z[4];
-         nearest_texcoord_4(sampler->wrap_s, s, width, x);
-         nearest_texcoord_4(sampler->wrap_t, t, height, y);
-         nearest_texcoord_4(sampler->wrap_r, p, depth, z);
-         for (j = 0; j < QUAD_SIZE; j++) {
-            get_texel(tgsi_sampler, face, level0, x[j], y[j], z[j], rgba, j);
-            if (level0 != level1) {
-               /* get texels from second mipmap level and blend */
-               float rgba2[4][4];
-               unsigned c;
-               x[j] /= 2;
-               y[j] /= 2;
-               z[j] /= 2;
-               get_texel(tgsi_sampler, face, level1, x[j], y[j], z[j], rgba2, j);
-               for (c = 0; c < NUM_CHANNELS; c++) {
-                  rgba[c][j] = lerp(levelBlend, rgba2[c][j], rgba[c][j]);
-               }
-            }
-         }
-      }
-      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 */
-         linear_texcoord_4(sampler->wrap_s, s, width,  x0, x1, xw);
-         linear_texcoord_4(sampler->wrap_t, t, height, y0, y1, yw);
-         linear_texcoord_4(sampler->wrap_r, p, depth,  z0, z1, zw);
-
-         for (j = 0; j < QUAD_SIZE; j++) {
-            int c;
-            float tx0[4][4], tx1[4][4];
-            get_texel(tgsi_sampler, face, level0, x0[j], y0[j], z0[j], tx0, 0);
-            get_texel(tgsi_sampler, face, level0, x1[j], y0[j], z0[j], tx0, 1);
-            get_texel(tgsi_sampler, face, level0, x0[j], y1[j], z0[j], tx0, 2);
-            get_texel(tgsi_sampler, face, level0, x1[j], y1[j], z0[j], tx0, 3);
-            get_texel(tgsi_sampler, face, level0, x0[j], y0[j], z1[j], tx1, 0);
-            get_texel(tgsi_sampler, face, level0, x1[j], y0[j], z1[j], tx1, 1);
-            get_texel(tgsi_sampler, face, level0, x0[j], y1[j], z1[j], tx1, 2);
-            get_texel(tgsi_sampler, face, level0, x1[j], y1[j], z1[j], tx1, 3);
-
-            /* interpolate R, G, B, A */
-            for (c = 0; c < 4; c++) {
-               rgba[c][j] = lerp_3d(xw[j], yw[j], zw[j],
-                                    tx0[c][0], tx0[c][1],
-                                    tx0[c][2], tx0[c][3],
-                                    tx1[c][0], tx1[c][1],
-                                    tx1[c][2], tx1[c][3]);
-            }
-
-            if (level0 != level1) {
-               /* get texels from second mipmap level and blend */
-               float rgba2[4][4];
-               x0[j] /= 2;
-               y0[j] /= 2;
-               z0[j] /= 2;
-               x1[j] /= 2;
-               y1[j] /= 2;
-               z1[j] /= 2;
-               get_texel(tgsi_sampler, face, level1, x0[j], y0[j], z0[j], tx0, 0);
-               get_texel(tgsi_sampler, face, level1, x1[j], y0[j], z0[j], tx0, 1);
-               get_texel(tgsi_sampler, face, level1, x0[j], y1[j], z0[j], tx0, 2);
-               get_texel(tgsi_sampler, face, level1, x1[j], y1[j], z0[j], tx0, 3);
-               get_texel(tgsi_sampler, face, level1, x0[j], y0[j], z1[j], tx1, 0);
-               get_texel(tgsi_sampler, face, level1, x1[j], y0[j], z1[j], tx1, 1);
-               get_texel(tgsi_sampler, face, level1, x0[j], y1[j], z1[j], tx1, 2);
-               get_texel(tgsi_sampler, face, level1, x1[j], y1[j], z1[j], tx1, 3);
-
-               /* interpolate R, G, B, A */
-               for (c = 0; c < 4; c++) {
-                  rgba2[c][j] = lerp_3d(xw[j], yw[j], zw[j],
-                                        tx0[c][0], tx0[c][1],
-                                        tx0[c][2], tx0[c][3],
-                                        tx1[c][0], tx1[c][1],
-                                        tx1[c][2], tx1[c][3]);
-               }
-
-               /* blend mipmap levels */
-               for (c = 0; c < NUM_CHANNELS; c++) {
-                  rgba[c][j] = lerp(levelBlend, rgba[c][j], rgba2[c][j]);
-               }
-            }
-         }
-      }
-      break;
-   default:
-      assert(0);
-   }
-}
-
-
-static void
-lp_get_samples_cube(struct tgsi_sampler *sampler,
-                    const float s[QUAD_SIZE],
-                    const float t[QUAD_SIZE],
-                    const float p[QUAD_SIZE],
-                    float lodbias,
-                    float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
-   unsigned faces[QUAD_SIZE], j;
-   float ssss[4], tttt[4];
-   for (j = 0; j < QUAD_SIZE; j++) {
-      faces[j] = choose_cube_face(s[j], t[j], p[j], ssss + j, tttt + j);
-   }
-   lp_get_samples_2d_common(sampler, ssss, tttt, NULL,
-                            lodbias, rgba, faces);
-}
-
-
-static void
-lp_get_samples_rect(struct tgsi_sampler *tgsi_sampler,
-                    const float s[QUAD_SIZE],
-                    const float t[QUAD_SIZE],
-                    const float p[QUAD_SIZE],
-                    float lodbias,
-                    float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
-   const struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
-   const struct pipe_texture *texture = samp->texture;
-   const struct pipe_sampler_state *sampler = samp->sampler;
-   const uint face = 0;
-   unsigned level0, level1, j, imgFilter;
-   int width, height;
-   float levelBlend;
-
-   choose_mipmap_levels(tgsi_sampler, s, t, p, 
-                        lodbias,
-                        &level0, &level1, &levelBlend, &imgFilter);
-
-   /* texture RECTS cannot be mipmapped */
-   assert(level0 == level1);
-
-   width = texture->width[level0];
-   height = texture->height[level0];
-
-   assert(width > 0);
-
-   switch (imgFilter) {
-   case PIPE_TEX_FILTER_NEAREST:
-      {
-         int x[4], y[4];
-         nearest_texcoord_unnorm_4(sampler->wrap_s, s, width, x);
-         nearest_texcoord_unnorm_4(sampler->wrap_t, t, height, y);
-         for (j = 0; j < QUAD_SIZE; j++) {
-            get_texel(tgsi_sampler, face, level0, x[j], y[j], 0, rgba, j);
-            if (sampler->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE) {
-               shadow_compare(sampler, rgba, p, j);
-            }
-         }
-      }
-      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 */
-         linear_texcoord_unnorm_4(sampler->wrap_s, s, width,  x0, x1, xw);
-         linear_texcoord_unnorm_4(sampler->wrap_t, t, height, y0, y1, yw);
-         for (j = 0; j < QUAD_SIZE; j++) {
-            float tx[4][4]; /* texels */
-            int c;
-            get_texel(tgsi_sampler, face, level0, x0[j], y0[j], 0, tx, 0);
-            get_texel(tgsi_sampler, face, level0, x1[j], y0[j], 0, tx, 1);
-            get_texel(tgsi_sampler, face, level0, x0[j], y1[j], 0, tx, 2);
-            get_texel(tgsi_sampler, face, level0, x1[j], y1[j], 0, tx, 3);
-            if (sampler->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE) {
-               shadow_compare4(sampler, tx, p);
-            }
-            for (c = 0; c < 4; c++) {
-               rgba[c][j] = lerp_2d(xw[j], yw[j],
-                                    tx[c][0], tx[c][1], tx[c][2], tx[c][3]);
-            }
-         }
-      }
-      break;
-   default:
-      assert(0);
-   }
-}
-
-
-/**
- * Error condition handler
- */
-static INLINE void
-lp_get_samples_null(struct tgsi_sampler *tgsi_sampler,
-                    const float s[QUAD_SIZE],
-                    const float t[QUAD_SIZE],
-                    const float p[QUAD_SIZE],
-                    float lodbias,
-                    float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
-   int i,j;
-
-   for (i = 0; i < 4; i++)
-      for (j = 0; j < 4; j++)
-         rgba[i][j] = 1.0;
-}
-
-/**
- * Called via tgsi_sampler::get_samples() when using a sampler for the
- * first time.  Determine the actual sampler function, link it in and
- * call it.
- */
-void
-lp_get_samples(struct tgsi_sampler *tgsi_sampler,
-               const float s[QUAD_SIZE],
-               const float t[QUAD_SIZE],
-               const float p[QUAD_SIZE],
-               float lodbias,
-               float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
-   struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
-   const struct pipe_texture *texture = samp->texture;
-   const struct pipe_sampler_state *sampler = samp->sampler;
-
-   /* Default to the 'undefined' case:
-    */
-   tgsi_sampler->get_samples = lp_get_samples_null;
-
-   if (!texture) {
-      assert(0);                /* is this legal?? */
-      goto out;
-   }
-
-   if (!sampler->normalized_coords) {
-      assert (texture->target == PIPE_TEXTURE_2D);
-      tgsi_sampler->get_samples = lp_get_samples_rect;
-      goto out;
-   }
-
-   switch (texture->target) {
-   case PIPE_TEXTURE_1D:
-      tgsi_sampler->get_samples = lp_get_samples_1d;
-      break;
-   case PIPE_TEXTURE_2D:
-      tgsi_sampler->get_samples = lp_get_samples_2d;
-      break;
-   case PIPE_TEXTURE_3D:
-      tgsi_sampler->get_samples = lp_get_samples_3d;
-      break;
-   case PIPE_TEXTURE_CUBE:
-      tgsi_sampler->get_samples = lp_get_samples_cube;
-      break;
-   default:
-      assert(0);
-      break;
-   }
-
-   /* Do this elsewhere: 
-    */
-   samp->xpot = util_unsigned_logbase2( samp->texture->width[0] );
-   samp->ypot = util_unsigned_logbase2( samp->texture->height[0] );
-
-   /* Try to hook in a faster sampler.  Ultimately we'll have to
-    * code-generate these.  Luckily most of this looks like it is
-    * orthogonal state within the sampler.
-    */
-   if (texture->target == PIPE_TEXTURE_2D &&
-       sampler->min_img_filter == sampler->mag_img_filter &&
-       sampler->wrap_s == sampler->wrap_t &&
-       sampler->compare_mode == FALSE &&
-       sampler->normalized_coords) 
-   {
-      if (sampler->min_mip_filter == PIPE_TEX_MIPFILTER_NONE) {
-         samp->level = CLAMP((int) sampler->min_lod,
-                             0, (int) texture->last_level);
-
-         if (sampler->wrap_s == PIPE_TEX_WRAP_REPEAT) {
-            switch (sampler->min_img_filter) {
-            case PIPE_TEX_FILTER_NEAREST:
-               tgsi_sampler->get_samples = lp_get_samples_2d_nearest_repeat_POT;
-               break;
-            case PIPE_TEX_FILTER_LINEAR:
-               tgsi_sampler->get_samples = lp_get_samples_2d_linear_repeat_POT;
-               break;
-            default:
-               break;
-            }
-         } 
-         else if (sampler->wrap_s == PIPE_TEX_WRAP_CLAMP) {
-            switch (sampler->min_img_filter) {
-            case PIPE_TEX_FILTER_NEAREST:
-               tgsi_sampler->get_samples = lp_get_samples_2d_nearest_clamp_POT;
-               break;
-            default:
-               break;
-            }
-         }
-      }
-      else if (sampler->min_mip_filter == PIPE_TEX_MIPFILTER_LINEAR) {
-         if (sampler->wrap_s == PIPE_TEX_WRAP_REPEAT) {
-            switch (sampler->min_img_filter) {
-            case PIPE_TEX_FILTER_LINEAR:
-               tgsi_sampler->get_samples = lp_get_samples_2d_linear_mip_linear_repeat_POT;
-               break;
-            default:
-               break;
-            }
-         } 
-      }
-   }
-   else if (0) {
-      _debug_printf("target %d/%d min_mip %d/%d min_img %d/%d wrap %d/%d compare %d/%d norm %d/%d\n",
-                    texture->target, PIPE_TEXTURE_2D,
-                    sampler->min_mip_filter, PIPE_TEX_MIPFILTER_NONE,
-                    sampler->min_img_filter, sampler->mag_img_filter,
-                    sampler->wrap_s, sampler->wrap_t,
-                    sampler->compare_mode, FALSE,
-                    sampler->normalized_coords, TRUE);
-   }
-
-out:
-   tgsi_sampler->get_samples( tgsi_sampler, s, t, p, lodbias, rgba );
-}
-
-
-void PIPE_CDECL
-lp_fetch_texel_soa( struct tgsi_sampler **samplers,
-                    uint32_t unit,
-                    float *store )
-{
-   struct tgsi_sampler *sampler = samplers[unit];
-
-#if 0
-   uint j;
-
-   debug_printf("%s sampler: %p (%p) store: %p\n",
-                __FUNCTION__,
-                sampler, *sampler,
-                store );
-
-   debug_printf("lodbias %f\n", store[12]);
-
-   for (j = 0; j < 4; j++)
-      debug_printf("sample %d texcoord %f %f\n",
-                   j,
-                   store[0+j],
-                   store[4+j]);
-#endif
-
-   {
-      float rgba[NUM_CHANNELS][QUAD_SIZE];
-      sampler->get_samples(sampler,
-                           &store[0],
-                           &store[4],
-                           &store[8],
-                           0.0f, /*store[12],  lodbias */
-                           rgba);
-      memcpy(store, rgba, sizeof rgba);
-   }
-
-#if 0
-   for (j = 0; j < 4; j++)
-      debug_printf("sample %d result %f %f %f %f\n",
-                   j,
-                   store[0+j],
-                   store[4+j],
-                   store[8+j],
-                   store[12+j]);
-#endif
-}
-
-
-#include "lp_bld_type.h"
-#include "lp_bld_intr.h"
-#include "lp_bld_tgsi.h"
-
-
-struct lp_c_sampler_soa
-{
-   struct lp_build_sampler_soa base;
-
-   LLVMValueRef context_ptr;
-
-   LLVMValueRef samplers_ptr;
-
-   /** Coords/texels store */
-   LLVMValueRef store_ptr;
-};
-
-
-static void
-lp_c_sampler_soa_destroy(struct lp_build_sampler_soa *sampler)
-{
-   FREE(sampler);
-}
-
-
-static void
-lp_c_sampler_soa_emit_fetch_texel(struct lp_build_sampler_soa *_sampler,
-                                  LLVMBuilderRef builder,
-                                  struct lp_type type,
-                                  unsigned unit,
-                                  unsigned num_coords,
-                                  const LLVMValueRef *coords,
-                                  LLVMValueRef lodbias,
-                                  LLVMValueRef *texel)
-{
-   struct lp_c_sampler_soa *sampler = (struct lp_c_sampler_soa *)_sampler;
-   LLVMTypeRef vec_type = LLVMTypeOf(coords[0]);
-   LLVMValueRef args[3];
-   unsigned i;
-
-   if(!sampler->samplers_ptr)
-      sampler->samplers_ptr = lp_jit_context_samplers(builder, sampler->context_ptr);
-
-   if(!sampler->store_ptr)
-      sampler->store_ptr = LLVMBuildArrayAlloca(builder,
-                                            vec_type,
-                                            LLVMConstInt(LLVMInt32Type(), 4, 0),
-                                            "texel_store");
-
-   for (i = 0; i < num_coords; i++) {
-      LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), i, 0);
-      LLVMValueRef coord_ptr = LLVMBuildGEP(builder, sampler->store_ptr, &index, 1, "");
-      LLVMBuildStore(builder, coords[i], coord_ptr);
-   }
-
-   args[0] = sampler->samplers_ptr;
-   args[1] = LLVMConstInt(LLVMInt32Type(), unit, 0);
-   args[2] = sampler->store_ptr;
-
-   lp_build_intrinsic(builder, "fetch_texel", LLVMVoidType(), args, 3);
-
-   for (i = 0; i < NUM_CHANNELS; ++i) {
-      LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), i, 0);
-      LLVMValueRef texel_ptr = LLVMBuildGEP(builder, sampler->store_ptr, &index, 1, "");
-      texel[i] = LLVMBuildLoad(builder, texel_ptr, "");
-   }
-}
-
-
-struct lp_build_sampler_soa *
-lp_c_sampler_soa_create(LLVMValueRef context_ptr)
-{
-   struct lp_c_sampler_soa *sampler;
-
-   sampler = CALLOC_STRUCT(lp_c_sampler_soa);
-   if(!sampler)
-      return NULL;
-
-   sampler->base.destroy = lp_c_sampler_soa_destroy;
-   sampler->base.emit_fetch_texel = lp_c_sampler_soa_emit_fetch_texel;
-   sampler->context_ptr = context_ptr;
-
-   return &sampler->base;
-}
-