softpipe: Constify variables

This commit makes a lot of variables constant - this is basically done
by moving the computation to variable definition. Some of them are
moved into lower scopes (like in img_filter_2d_ewa).

Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>

1 files changed, 199 insertions, 242 deletions

diff --git a/src/gallium/drivers/softpipe/sp_tex_sample.c b/src/gallium/drivers/softpipe/sp_tex_sample.c
index b0c4989..dfe38af 100644
--- a/src/gallium/drivers/softpipe/sp_tex_sample.c
+++ b/src/gallium/drivers/softpipe/sp_tex_sample.c
@@ -135,7 +135,7 @@ wrap_nearest_repeat(float s, unsigned size, int offset, int *icoord)
 {
    /* s limited to [0,1) */
    /* i limited to [0,size-1] */
-   int i = util_ifloor(s * size);
+   const int i = util_ifloor(s * size);
    *icoord = repeat(i + offset, size);
 }
 
@@ -280,7 +280,7 @@ static void
 wrap_linear_repeat(float s, unsigned size, int offset,
                    int *icoord0, int *icoord1, float *w)
 {
-   float u = s * size - 0.5F;
+   const float u = s * size - 0.5F;
    *icoord0 = repeat(util_ifloor(u) + offset, size);
    *icoord1 = repeat(*icoord0 + 1, size);
    *w = frac(u);
@@ -291,9 +291,8 @@ static void
 wrap_linear_clamp(float s, unsigned size, int offset,
                   int *icoord0, int *icoord1, float *w)
 {
-   float u = CLAMP(s * size + offset, 0.0F, (float)size);
+   const float u = CLAMP(s * size + offset, 0.0F, (float)size) - 0.5f;
 
-   u = u - 0.5f;
    *icoord0 = util_ifloor(u);
    *icoord1 = *icoord0 + 1;
    *w = frac(u);
@@ -304,8 +303,7 @@ static void
 wrap_linear_clamp_to_edge(float s, unsigned size, int offset,
                           int *icoord0, int *icoord1, float *w)
 {
-   float u = CLAMP(s * size + offset, 0.0F, (float)size);
-   u = u - 0.5f;
+   const float u = CLAMP(s * size + offset, 0.0F, (float)size) - 0.5f;
    *icoord0 = util_ifloor(u);
    *icoord1 = *icoord0 + 1;
    if (*icoord0 < 0)
@@ -322,8 +320,7 @@ wrap_linear_clamp_to_border(float s, unsigned size, int offset,
 {
    const float min = -0.5F;
    const float max = (float)size + 0.5F;
-   float u = CLAMP(s * size + offset, min, max);
-   u = u - 0.5f;
+   const float u = CLAMP(s * size + offset, min, max) - 0.5f;
    *icoord0 = util_ifloor(u);
    *icoord1 = *icoord0 + 1;
    *w = frac(u);
@@ -391,12 +388,8 @@ wrap_linear_mirror_clamp_to_border(float s, unsigned size, int offset,
 {
    const float min = -0.5F;
    const float max = size + 0.5F;
-   float u = fabsf(s * size + offset);
-   if (u <= min)
-      u = min;
-   else if (u >= max)
-      u = max;
-   u -= 0.5F;
+   const float t = fabsf(s * size + offset);
+   const float u = CLAMP(t, min, max) - 0.5F;
    *icoord0 = util_ifloor(u);
    *icoord1 = *icoord0 + 1;
    *w = frac(u);
@@ -409,7 +402,7 @@ wrap_linear_mirror_clamp_to_border(float s, unsigned size, int offset,
 static void
 wrap_nearest_unorm_clamp(float s, unsigned size, int offset, int *icoord)
 {
-   int i = util_ifloor(s);
+   const int i = util_ifloor(s);
    *icoord = CLAMP(i + offset, 0, (int) size-1);
 }
 
@@ -442,7 +435,7 @@ wrap_linear_unorm_clamp(float s, unsigned size, int offset,
                         int *icoord0, int *icoord1, float *w)
 {
    /* Not exactly what the spec says, but it matches NVIDIA output */
-   float u = CLAMP(s + offset - 0.5F, 0.0f, (float) size - 1.0f);
+   const float u = CLAMP(s + offset - 0.5F, 0.0f, (float) size - 1.0f);
    *icoord0 = util_ifloor(u);
    *icoord1 = *icoord0 + 1;
    *w = frac(u);
@@ -456,8 +449,7 @@ static void
 wrap_linear_unorm_clamp_to_border(float s, unsigned size, int offset,
                                   int *icoord0, int *icoord1, float *w)
 {
-   float u = CLAMP(s + offset, -0.5F, (float) size + 0.5F);
-   u -= 0.5F;
+   const float u = CLAMP(s + offset, -0.5F, (float) size + 0.5F) - 0.5F;
    *icoord0 = util_ifloor(u);
    *icoord1 = *icoord0 + 1;
    if (*icoord1 > (int) size - 1)
@@ -473,8 +465,7 @@ static void
 wrap_linear_unorm_clamp_to_edge(float s, unsigned size, int offset,
                                 int *icoord0, int *icoord1, float *w)
 {
-   float u = CLAMP(s + offset, +0.5F, (float) size - 0.5F);
-   u -= 0.5F;
+   const float u = CLAMP(s + offset, +0.5F, (float) size - 0.5F) - 0.5F;
    *icoord0 = util_ifloor(u);
    *icoord1 = *icoord0 + 1;
    if (*icoord1 > (int) size - 1)
@@ -489,7 +480,7 @@ wrap_linear_unorm_clamp_to_edge(float s, unsigned size, int offset,
 static inline int
 coord_to_layer(float coord, unsigned first_layer, unsigned last_layer)
 {
-   int c = util_ifloor(coord + 0.5F);
+   const int c = util_ifloor(coord + 0.5F);
    return CLAMP(c, (int)first_layer, (int)last_layer);
 }
 
@@ -505,9 +496,9 @@ compute_lambda_1d(const struct sp_sampler_view *sview,
                   const float p[TGSI_QUAD_SIZE])
 {
    const struct pipe_resource *texture = sview->base.texture;
-   float dsdx = fabsf(s[QUAD_BOTTOM_RIGHT] - s[QUAD_BOTTOM_LEFT]);
-   float dsdy = fabsf(s[QUAD_TOP_LEFT]     - s[QUAD_BOTTOM_LEFT]);
-   float rho = MAX2(dsdx, dsdy) * u_minify(texture->width0, sview->base.u.tex.first_level);
+   const float dsdx = fabsf(s[QUAD_BOTTOM_RIGHT] - s[QUAD_BOTTOM_LEFT]);
+   const float dsdy = fabsf(s[QUAD_TOP_LEFT]     - s[QUAD_BOTTOM_LEFT]);
+   const float rho = MAX2(dsdx, dsdy) * u_minify(texture->width0, sview->base.u.tex.first_level);
 
    return util_fast_log2(rho);
 }
@@ -520,13 +511,13 @@ compute_lambda_2d(const struct sp_sampler_view *sview,
                   const float p[TGSI_QUAD_SIZE])
 {
    const struct pipe_resource *texture = sview->base.texture;
-   float dsdx = fabsf(s[QUAD_BOTTOM_RIGHT] - s[QUAD_BOTTOM_LEFT]);
-   float dsdy = fabsf(s[QUAD_TOP_LEFT]     - s[QUAD_BOTTOM_LEFT]);
-   float dtdx = fabsf(t[QUAD_BOTTOM_RIGHT] - t[QUAD_BOTTOM_LEFT]);
-   float dtdy = fabsf(t[QUAD_TOP_LEFT]     - t[QUAD_BOTTOM_LEFT]);
-   float maxx = MAX2(dsdx, dsdy) * u_minify(texture->width0, sview->base.u.tex.first_level);
-   float maxy = MAX2(dtdx, dtdy) * u_minify(texture->height0, sview->base.u.tex.first_level);
-   float rho  = MAX2(maxx, maxy);
+   const float dsdx = fabsf(s[QUAD_BOTTOM_RIGHT] - s[QUAD_BOTTOM_LEFT]);
+   const float dsdy = fabsf(s[QUAD_TOP_LEFT]     - s[QUAD_BOTTOM_LEFT]);
+   const float dtdx = fabsf(t[QUAD_BOTTOM_RIGHT] - t[QUAD_BOTTOM_LEFT]);
+   const float dtdy = fabsf(t[QUAD_TOP_LEFT]     - t[QUAD_BOTTOM_LEFT]);
+   const float maxx = MAX2(dsdx, dsdy) * u_minify(texture->width0, sview->base.u.tex.first_level);
+   const float maxy = MAX2(dtdx, dtdy) * u_minify(texture->height0, sview->base.u.tex.first_level);
+   const float rho  = MAX2(maxx, maxy);
 
    return util_fast_log2(rho);
 }
@@ -539,19 +530,16 @@ compute_lambda_3d(const struct sp_sampler_view *sview,
                   const float p[TGSI_QUAD_SIZE])
 {
    const struct pipe_resource *texture = sview->base.texture;
-   float dsdx = fabsf(s[QUAD_BOTTOM_RIGHT] - s[QUAD_BOTTOM_LEFT]);
-   float dsdy = fabsf(s[QUAD_TOP_LEFT]     - s[QUAD_BOTTOM_LEFT]);
-   float dtdx = fabsf(t[QUAD_BOTTOM_RIGHT] - t[QUAD_BOTTOM_LEFT]);
-   float dtdy = fabsf(t[QUAD_TOP_LEFT]     - t[QUAD_BOTTOM_LEFT]);
-   float dpdx = fabsf(p[QUAD_BOTTOM_RIGHT] - p[QUAD_BOTTOM_LEFT]);
-   float dpdy = fabsf(p[QUAD_TOP_LEFT]     - p[QUAD_BOTTOM_LEFT]);
-   float maxx = MAX2(dsdx, dsdy) * u_minify(texture->width0, sview->base.u.tex.first_level);
-   float maxy = MAX2(dtdx, dtdy) * u_minify(texture->height0, sview->base.u.tex.first_level);
-   float maxz = MAX2(dpdx, dpdy) * u_minify(texture->depth0, sview->base.u.tex.first_level);
-   float rho;
-
-   rho = MAX2(maxx, maxy);
-   rho = MAX2(rho, maxz);
+   const float dsdx = fabsf(s[QUAD_BOTTOM_RIGHT] - s[QUAD_BOTTOM_LEFT]);
+   const float dsdy = fabsf(s[QUAD_TOP_LEFT]     - s[QUAD_BOTTOM_LEFT]);
+   const float dtdx = fabsf(t[QUAD_BOTTOM_RIGHT] - t[QUAD_BOTTOM_LEFT]);
+   const float dtdy = fabsf(t[QUAD_TOP_LEFT]     - t[QUAD_BOTTOM_LEFT]);
+   const float dpdx = fabsf(p[QUAD_BOTTOM_RIGHT] - p[QUAD_BOTTOM_LEFT]);
+   const float dpdy = fabsf(p[QUAD_TOP_LEFT]     - p[QUAD_BOTTOM_LEFT]);
+   const float maxx = MAX2(dsdx, dsdy) * u_minify(texture->width0, sview->base.u.tex.first_level);
+   const float maxy = MAX2(dtdx, dtdy) * u_minify(texture->height0, sview->base.u.tex.first_level);
+   const float maxz = MAX2(dpdx, dpdy) * u_minify(texture->depth0, sview->base.u.tex.first_level);
+   const float rho = MAX3(maxx, maxy, maxz);
 
    return util_fast_log2(rho);
 }
@@ -609,7 +597,7 @@ get_texel_2d(const struct sp_sampler_view *sp_sview,
              union tex_tile_address addr, int x, int y)
 {
    const struct pipe_resource *texture = sp_sview->base.texture;
-   unsigned level = addr.bits.level;
+   const unsigned level = addr.bits.level;
 
    if (x < 0 || x >= (int) u_minify(texture->width0, level) ||
        y < 0 || y >= (int) u_minify(texture->height0, level)) {
@@ -852,7 +840,7 @@ get_texel_3d(const struct sp_sampler_view *sp_sview,
              union tex_tile_address addr, int x, int y, int z)
 {
    const struct pipe_resource *texture = sp_sview->base.texture;
-   unsigned level = addr.bits.level;
+   const unsigned level = addr.bits.level;
 
    if (x < 0 || x >= (int) u_minify(texture->width0, level) ||
        y < 0 || y >= (int) u_minify(texture->height0, level) ||
@@ -872,7 +860,7 @@ get_texel_1d_array(const struct sp_sampler_view *sp_sview,
                    union tex_tile_address addr, int x, int y)
 {
    const struct pipe_resource *texture = sp_sview->base.texture;
-   unsigned level = addr.bits.level;
+   const unsigned level = addr.bits.level;
 
    if (x < 0 || x >= (int) u_minify(texture->width0, level)) {
       return sp_samp->base.border_color.f;
@@ -890,7 +878,7 @@ get_texel_2d_array(const struct sp_sampler_view *sp_sview,
                    union tex_tile_address addr, int x, int y, int layer)
 {
    const struct pipe_resource *texture = sp_sview->base.texture;
-   unsigned level = addr.bits.level;
+   const unsigned level = addr.bits.level;
 
    assert(layer < (int) texture->array_size);
    assert(layer >= 0);
@@ -911,7 +899,7 @@ get_texel_cube_seamless(const struct sp_sampler_view *sp_sview,
                         float *corner, int layer, unsigned face)
 {
    const struct pipe_resource *texture = sp_sview->base.texture;
-   unsigned level = addr.bits.level;
+   const unsigned level = addr.bits.level;
    int new_x, new_y, max_x;
 
    max_x = (int) u_minify(texture->width0, level);
@@ -966,7 +954,7 @@ get_texel_cube_array(const struct sp_sampler_view *sp_sview,
                      union tex_tile_address addr, int x, int y, int layer)
 {
    const struct pipe_resource *texture = sp_sview->base.texture;
-   unsigned level = addr.bits.level;
+   const unsigned level = addr.bits.level;
 
    assert(layer < (int) texture->array_size);
    assert(layer >= 0);
@@ -1022,24 +1010,24 @@ img_filter_2d_linear_repeat_POT(const struct sp_sampler_view *sp_sview,
                                 const struct img_filter_args *args,
                                 float *rgba)
 {
-   unsigned xpot = pot_level_size(sp_sview->xpot, args->level);
-   unsigned ypot = pot_level_size(sp_sview->ypot, args->level);
-   int xmax = (xpot - 1) & (TEX_TILE_SIZE - 1); /* MIN2(TEX_TILE_SIZE, xpot) - 1; */
-   int ymax = (ypot - 1) & (TEX_TILE_SIZE - 1); /* MIN2(TEX_TILE_SIZE, ypot) - 1; */
+   const unsigned xpot = pot_level_size(sp_sview->xpot, args->level);
+   const unsigned ypot = pot_level_size(sp_sview->ypot, args->level);
+   const int xmax = (xpot - 1) & (TEX_TILE_SIZE - 1); /* MIN2(TEX_TILE_SIZE, xpot) - 1; */
+   const int ymax = (ypot - 1) & (TEX_TILE_SIZE - 1); /* MIN2(TEX_TILE_SIZE, ypot) - 1; */
    union tex_tile_address addr;
    int c;
 
-   float u = (args->s * xpot - 0.5F) + args->offset[0];
-   float v = (args->t * ypot - 0.5F) + args->offset[1];
+   const float u = (args->s * xpot - 0.5F) + args->offset[0];
+   const float v = (args->t * ypot - 0.5F) + args->offset[1];
 
-   int uflr = util_ifloor(u);
-   int vflr = util_ifloor(v);
+   const int uflr = util_ifloor(u);
+   const int vflr = util_ifloor(v);
 
-   float xw = u - (float)uflr;
-   float yw = v - (float)vflr;
+   const float xw = u - (float)uflr;
+   const float yw = v - (float)vflr;
 
-   int x0 = uflr & (xpot - 1);
-   int y0 = vflr & (ypot - 1);
+   const int x0 = uflr & (xpot - 1);
+   const int y0 = vflr & (ypot - 1);
 
    const float *tx[4];
       
@@ -1052,8 +1040,8 @@ img_filter_2d_linear_repeat_POT(const struct sp_sampler_view *sp_sview,
       get_texel_quad_2d_no_border_single_tile(sp_sview, addr, x0, y0, tx);
    }
    else {
-      unsigned x1 = (x0 + 1) & (xpot - 1);
-      unsigned y1 = (y0 + 1) & (ypot - 1);
+      const unsigned x1 = (x0 + 1) & (xpot - 1);
+      const unsigned y1 = (y0 + 1) & (ypot - 1);
       get_texel_quad_2d_no_border(sp_sview, addr, x0, y0, x1, y1, tx);
    }
 
@@ -1076,20 +1064,20 @@ img_filter_2d_nearest_repeat_POT(const struct sp_sampler_view *sp_sview,
                                  const struct img_filter_args *args,
                                  float rgba[TGSI_QUAD_SIZE])
 {
-   unsigned xpot = pot_level_size(sp_sview->xpot, args->level);
-   unsigned ypot = pot_level_size(sp_sview->ypot, args->level);
+   const unsigned xpot = pot_level_size(sp_sview->xpot, args->level);
+   const unsigned ypot = pot_level_size(sp_sview->ypot, args->level);
    const float *out;
    union tex_tile_address addr;
    int c;
 
-   float u = args->s * xpot + args->offset[0];
-   float v = args->t * ypot + args->offset[1];
+   const float u = args->s * xpot + args->offset[0];
+   const float v = args->t * ypot + args->offset[1];
 
-   int uflr = util_ifloor(u);
-   int vflr = util_ifloor(v);
+   const int uflr = util_ifloor(u);
+   const int vflr = util_ifloor(v);
 
-   int x0 = uflr & (xpot - 1);
-   int y0 = vflr & (ypot - 1);
+   const int x0 = uflr & (xpot - 1);
+   const int y0 = vflr & (ypot - 1);
 
    addr.value = 0;
    addr.bits.level = args->level;
@@ -1110,13 +1098,13 @@ img_filter_2d_nearest_clamp_POT(const struct sp_sampler_view *sp_sview,
                                 const struct img_filter_args *args,
                                 float rgba[TGSI_QUAD_SIZE])
 {
-   unsigned xpot = pot_level_size(sp_sview->xpot, args->level);
-   unsigned ypot = pot_level_size(sp_sview->ypot, args->level);
+   const unsigned xpot = pot_level_size(sp_sview->xpot, args->level);
+   const unsigned ypot = pot_level_size(sp_sview->ypot, args->level);
    union tex_tile_address addr;
    int c;
 
-   float u = args->s * xpot + args->offset[0];
-   float v = args->t * ypot + args->offset[1];
+   const float u = args->s * xpot + args->offset[0];
+   const float v = args->t * ypot + args->offset[1];
 
    int x0, y0;
    const float *out;
@@ -1153,14 +1141,12 @@ img_filter_1d_nearest(const struct sp_sampler_view *sp_sview,
                       float rgba[TGSI_QUAD_SIZE])
 {
    const struct pipe_resource *texture = sp_sview->base.texture;
-   int width;
+   const int width = u_minify(texture->width0, args->level);
    int x;
    union tex_tile_address addr;
    const float *out;
    int c;
 
-   width = u_minify(texture->width0, args->level);
-
    assert(width > 0);
 
    addr.value = 0;
@@ -1185,22 +1171,20 @@ img_filter_1d_array_nearest(const struct sp_sampler_view *sp_sview,
                             float *rgba)
 {
    const struct pipe_resource *texture = sp_sview->base.texture;
-   int width;
-   int x, layer;
+   const int width = u_minify(texture->width0, args->level);
+   const int layer = coord_to_layer(args->t, sp_sview->base.u.tex.first_layer,
+                                    sp_sview->base.u.tex.last_layer);
+   int x;
    union tex_tile_address addr;
    const float *out;
    int c;
 
-   width = u_minify(texture->width0, args->level);
-
    assert(width > 0);
 
    addr.value = 0;
    addr.bits.level = args->level;
 
    sp_samp->nearest_texcoord_s(args->s, width, args->offset[0], &x);
-   layer = coord_to_layer(args->t, sp_sview->base.u.tex.first_layer,
-                          sp_sview->base.u.tex.last_layer);
 
    out = get_texel_1d_array(sp_sview, sp_samp, addr, x, layer);
    for (c = 0; c < TGSI_QUAD_SIZE; c++)
@@ -1219,15 +1203,13 @@ img_filter_2d_nearest(const struct sp_sampler_view *sp_sview,
                       float *rgba)
 {
    const struct pipe_resource *texture = sp_sview->base.texture;
-   int width, height;
+   const int width = u_minify(texture->width0, args->level);
+   const int height = u_minify(texture->height0, args->level);
    int x, y;
    union tex_tile_address addr;
    const float *out;
    int c;
 
-   width = u_minify(texture->width0, args->level);
-   height = u_minify(texture->height0, args->level);
-
    assert(width > 0);
    assert(height > 0);
  
@@ -1254,15 +1236,15 @@ img_filter_2d_array_nearest(const struct sp_sampler_view *sp_sview,
                             float *rgba)
 {
    const struct pipe_resource *texture = sp_sview->base.texture;
-   int width, height;
-   int x, y, layer;
+   const int width = u_minify(texture->width0, args->level);
+   const int height = u_minify(texture->height0, args->level);
+   const int layer = coord_to_layer(args->p, sp_sview->base.u.tex.first_layer,
+                                    sp_sview->base.u.tex.last_layer);
+   int x, y;
    union tex_tile_address addr;
    const float *out;
    int c;
 
-   width = u_minify(texture->width0, args->level);
-   height = u_minify(texture->height0, args->level);
-
    assert(width > 0);
    assert(height > 0);
  
@@ -1271,8 +1253,6 @@ img_filter_2d_array_nearest(const struct sp_sampler_view *sp_sview,
 
    sp_samp->nearest_texcoord_s(args->s, width, args->offset[0], &x);
    sp_samp->nearest_texcoord_t(args->t, height, args->offset[1], &y);
-   layer = coord_to_layer(args->p, sp_sview->base.u.tex.first_layer,
-                          sp_sview->base.u.tex.last_layer);
 
    out = get_texel_2d_array(sp_sview, sp_samp, addr, x, y, layer);
    for (c = 0; c < TGSI_QUAD_SIZE; c++)
@@ -1291,15 +1271,14 @@ img_filter_cube_nearest(const struct sp_sampler_view *sp_sview,
                         float *rgba)
 {
    const struct pipe_resource *texture = sp_sview->base.texture;
-   int width, height;
-   int x, y, layerface;
+   const int width = u_minify(texture->width0, args->level);
+   const int height = u_minify(texture->height0, args->level);
+   const int layerface = args->face_id + sp_sview->base.u.tex.first_layer;
+   int x, y;
    union tex_tile_address addr;
    const float *out;
    int c;
 
-   width = u_minify(texture->width0, args->level);
-   height = u_minify(texture->height0, args->level);
-
    assert(width > 0);
    assert(height > 0);
  
@@ -1319,7 +1298,6 @@ img_filter_cube_nearest(const struct sp_sampler_view *sp_sview,
       sp_samp->nearest_texcoord_t(args->t, height, args->offset[1], &y);
    }
 
-   layerface = args->face_id + sp_sview->base.u.tex.first_layer;
    out = get_texel_cube_array(sp_sview, sp_samp, addr, x, y, layerface);
    for (c = 0; c < TGSI_QUAD_SIZE; c++)
       rgba[TGSI_NUM_CHANNELS*c] = out[c];
@@ -1336,15 +1314,17 @@ img_filter_cube_array_nearest(const struct sp_sampler_view *sp_sview,
                               float *rgba)
 {
    const struct pipe_resource *texture = sp_sview->base.texture;
-   int width, height;
-   int x, y, layerface;
+   const int width = u_minify(texture->width0, args->level);
+   const int height = u_minify(texture->height0, args->level);
+   const int layerface =
+      coord_to_layer(6 * args->p + sp_sview->base.u.tex.first_layer,
+                     sp_sview->base.u.tex.first_layer,
+                     sp_sview->base.u.tex.last_layer - 5) + args->face_id;
+   int x, y;
    union tex_tile_address addr;
    const float *out;
    int c;
 
-   width = u_minify(texture->width0, args->level);
-   height = u_minify(texture->height0, args->level);
-
    assert(width > 0);
    assert(height > 0);
  
@@ -1353,9 +1333,6 @@ img_filter_cube_array_nearest(const struct sp_sampler_view *sp_sview,
 
    sp_samp->nearest_texcoord_s(args->s, width, args->offset[0], &x);
    sp_samp->nearest_texcoord_t(args->t, height, args->offset[1], &y);
-   layerface = coord_to_layer(6 * args->p + sp_sview->base.u.tex.first_layer,
-                              sp_sview->base.u.tex.first_layer,
-                              sp_sview->base.u.tex.last_layer - 5) + args->face_id;
 
    out = get_texel_cube_array(sp_sview, sp_samp, addr, x, y, layerface);
    for (c = 0; c < TGSI_QUAD_SIZE; c++)
@@ -1373,16 +1350,14 @@ img_filter_3d_nearest(const struct sp_sampler_view *sp_sview,
                       float *rgba)
 {
    const struct pipe_resource *texture = sp_sview->base.texture;
-   int width, height, depth;
+   const int width = u_minify(texture->width0, args->level);
+   const int height = u_minify(texture->height0, args->level);
+   const int depth = u_minify(texture->depth0, args->level);
    int x, y, z;
    union tex_tile_address addr;
    const float *out;
    int c;
 
-   width = u_minify(texture->width0, args->level);
-   height = u_minify(texture->height0, args->level);
-   depth = u_minify(texture->depth0, args->level);
-
    assert(width > 0);
    assert(height > 0);
    assert(depth > 0);
@@ -1407,15 +1382,13 @@ img_filter_1d_linear(const struct sp_sampler_view *sp_sview,
                      float *rgba)
 {
    const struct pipe_resource *texture = sp_sview->base.texture;
-   int width;
+   const int width = u_minify(texture->width0, args->level);
    int x0, x1;
    float xw; /* weights */
    union tex_tile_address addr;
    const float *tx0, *tx1;
    int c;
 
-   width = u_minify(texture->width0, args->level);
-
    assert(width > 0);
 
    addr.value = 0;
@@ -1439,23 +1412,21 @@ img_filter_1d_array_linear(const struct sp_sampler_view *sp_sview,
                            float *rgba)
 {
    const struct pipe_resource *texture = sp_sview->base.texture;
-   int width;
-   int x0, x1, layer;
+   const int width = u_minify(texture->width0, args->level);
+   const int layer = coord_to_layer(args->t, sp_sview->base.u.tex.first_layer,
+                                    sp_sview->base.u.tex.last_layer);
+   int x0, x1;
    float xw; /* weights */
    union tex_tile_address addr;
    const float *tx0, *tx1;
    int c;
 
-   width = u_minify(texture->width0, args->level);
-
    assert(width > 0);
 
    addr.value = 0;
    addr.bits.level = args->level;
 
    sp_samp->linear_texcoord_s(args->s, width, args->offset[0], &x0, &x1, &xw);
-   layer = coord_to_layer(args->t, sp_sview->base.u.tex.first_layer,
-                          sp_sview->base.u.tex.last_layer);
 
    tx0 = get_texel_1d_array(sp_sview, sp_samp, addr, x0, layer);
    tx1 = get_texel_1d_array(sp_sview, sp_samp, addr, x1, layer);
@@ -1539,16 +1510,14 @@ img_filter_2d_linear(const struct sp_sampler_view *sp_sview,
                      float *rgba)
 {
    const struct pipe_resource *texture = sp_sview->base.texture;
-   int width, height;
+   const int width = u_minify(texture->width0, args->level);
+   const int height = u_minify(texture->height0, args->level);
    int x0, y0, x1, y1;
    float xw, yw; /* weights */
    union tex_tile_address addr;
    const float *tx[4];
    int c;
 
-   width = u_minify(texture->width0, args->level);
-   height = u_minify(texture->height0, args->level);
-
    assert(width > 0);
    assert(height > 0);
 
@@ -1585,16 +1554,16 @@ img_filter_2d_array_linear(const struct sp_sampler_view *sp_sview,
                            float *rgba)
 {
    const struct pipe_resource *texture = sp_sview->base.texture;
-   int width, height;
-   int x0, y0, x1, y1, layer;
+   const int width = u_minify(texture->width0, args->level);
+   const int height = u_minify(texture->height0, args->level);
+   const int layer = coord_to_layer(args->p, sp_sview->base.u.tex.first_layer,
+                                    sp_sview->base.u.tex.last_layer);
+   int x0, y0, x1, y1;
    float xw, yw; /* weights */
    union tex_tile_address addr;
    const float *tx[4];
    int c;
 
-   width = u_minify(texture->width0, args->level);
-   height = u_minify(texture->height0, args->level);
-
    assert(width > 0);
    assert(height > 0);
 
@@ -1603,8 +1572,6 @@ img_filter_2d_array_linear(const struct sp_sampler_view *sp_sview,
 
    sp_samp->linear_texcoord_s(args->s, width,  args->offset[0], &x0, &x1, &xw);
    sp_samp->linear_texcoord_t(args->t, height, args->offset[1], &y0, &y1, &yw);
-   layer = coord_to_layer(args->p, sp_sview->base.u.tex.first_layer,
-                          sp_sview->base.u.tex.last_layer);
 
    tx[0] = get_texel_2d_array(sp_sview, sp_samp, addr, x0, y0, layer);
    tx[1] = get_texel_2d_array(sp_sview, sp_samp, addr, x1, y0, layer);
@@ -1633,8 +1600,10 @@ img_filter_cube_linear(const struct sp_sampler_view *sp_sview,
                        float *rgba)
 {
    const struct pipe_resource *texture = sp_sview->base.texture;
-   int width, height;
-   int x0, y0, x1, y1, layer;
+   const int width = u_minify(texture->width0, args->level);
+   const int height = u_minify(texture->height0, args->level);
+   const int layer = sp_sview->base.u.tex.first_layer;
+   int x0, y0, x1, y1;
    float xw, yw; /* weights */
    union tex_tile_address addr;
    const float *tx[4];
@@ -1642,9 +1611,6 @@ img_filter_cube_linear(const struct sp_sampler_view *sp_sview,
          corner2[TGSI_QUAD_SIZE], corner3[TGSI_QUAD_SIZE];
    int c;
 
-   width = u_minify(texture->width0, args->level);
-   height = u_minify(texture->height0, args->level);
-
    assert(width > 0);
    assert(height > 0);
 
@@ -1665,8 +1631,6 @@ img_filter_cube_linear(const struct sp_sampler_view *sp_sview,
       sp_samp->linear_texcoord_t(args->t, height, args->offset[1], &y0, &y1, &yw);
    }
 
-   layer = sp_sview->base.u.tex.first_layer;
-
    if (sp_samp->base.seamless_cube_map) {
       tx[0] = get_texel_cube_seamless(sp_sview, addr, x0, y0, corner0, layer, args->face_id);
       tx[1] = get_texel_cube_seamless(sp_sview, addr, x1, y0, corner1, layer, args->face_id);
@@ -1701,8 +1665,13 @@ img_filter_cube_array_linear(const struct sp_sampler_view *sp_sview,
                              float *rgba)
 {
    const struct pipe_resource *texture = sp_sview->base.texture;
-   int width, height;
-   int x0, y0, x1, y1, layer;
+   const int width = u_minify(texture->width0, args->level);
+   const int height = u_minify(texture->height0, args->level);
+   const int layer =
+      coord_to_layer(6 * args->p + sp_sview->base.u.tex.first_layer,
+                     sp_sview->base.u.tex.first_layer,
+                     sp_sview->base.u.tex.last_layer - 5);
+   int x0, y0, x1, y1;
    float xw, yw; /* weights */
    union tex_tile_address addr;
    const float *tx[4];
@@ -1710,9 +1679,6 @@ img_filter_cube_array_linear(const struct sp_sampler_view *sp_sview,
          corner2[TGSI_QUAD_SIZE], corner3[TGSI_QUAD_SIZE];
    int c;
 
-   width = u_minify(texture->width0, args->level);
-   height = u_minify(texture->height0, args->level);
-
    assert(width > 0);
    assert(height > 0);
 
@@ -1733,10 +1699,6 @@ img_filter_cube_array_linear(const struct sp_sampler_view *sp_sview,
       sp_samp->linear_texcoord_t(args->t, height, args->offset[1], &y0, &y1, &yw);
    }
 
-   layer = coord_to_layer(6 * args->p + sp_sview->base.u.tex.first_layer,
-                          sp_sview->base.u.tex.first_layer,
-                          sp_sview->base.u.tex.last_layer - 5);
-
    if (sp_samp->base.seamless_cube_map) {
       tx[0] = get_texel_cube_seamless(sp_sview, addr, x0, y0, corner0, layer, args->face_id);
       tx[1] = get_texel_cube_seamless(sp_sview, addr, x1, y0, corner1, layer, args->face_id);
@@ -1770,17 +1732,15 @@ img_filter_3d_linear(const struct sp_sampler_view *sp_sview,
                      float *rgba)
 {
    const struct pipe_resource *texture = sp_sview->base.texture;
-   int width, height, depth;
+   const int width = u_minify(texture->width0, args->level);
+   const int height = u_minify(texture->height0, args->level);
+   const int depth = u_minify(texture->depth0, args->level);
    int x0, x1, y0, y1, z0, z1;
    float xw, yw, zw; /* interpolation weights */
    union tex_tile_address addr;
    const float *tx00, *tx01, *tx02, *tx03, *tx10, *tx11, *tx12, *tx13;
    int c;
 
-   width = u_minify(texture->width0, args->level);
-   height = u_minify(texture->height0, args->level);
-   depth = u_minify(texture->depth0, args->level);
-
    addr.value = 0;
    addr.bits.level = args->level;
 
@@ -1826,8 +1786,8 @@ compute_lod(const struct pipe_sampler_state *sampler,
             const float lod_in[TGSI_QUAD_SIZE],
             float lod[TGSI_QUAD_SIZE])
 {
-   float min_lod = sampler->min_lod;
-   float max_lod = sampler->max_lod;
+   const float min_lod = sampler->min_lod;
+   const float max_lod = sampler->max_lod;
    uint i;
 
    switch (control) {
@@ -1998,7 +1958,7 @@ mip_filter_linear(const struct sp_sampler_view *sp_sview,
    args.gather_comp = get_gather_component(lod_in);
 
    for (j = 0; j < TGSI_QUAD_SIZE; j++) {
-      int level0 = psview->u.tex.first_level + (int)lod[j];
+      const int level0 = psview->u.tex.first_level + (int)lod[j];
 
       args.s = s[j];
       args.t = t[j];
@@ -2093,7 +2053,7 @@ mip_filter_nearest(const struct sp_sampler_view *sp_sview,
          args.level = psview->u.tex.first_level;
          mag_filter(sp_sview, sp_samp, &args, &rgba[0][j]);
       } else {
-         int level = psview->u.tex.first_level + (int)(lod[j] + 0.5F);
+         const int level = psview->u.tex.first_level + (int)(lod[j] + 0.5F);
          args.level = MIN2(level, (int)psview->u.tex.last_level);
          min_filter(sp_sview, sp_samp, &args, &rgba[0][j]);
       }
@@ -2202,7 +2162,7 @@ mip_filter_none_no_filter_select(const struct sp_sampler_view *sp_sview,
 /* For anisotropic filtering */
 #define WEIGHT_LUT_SIZE 1024
 
-static float *weightLut = NULL;
+static const float *weightLut = NULL;
 
 /**
  * Creates the look-up table used to speed-up EWA sampling
@@ -2212,14 +2172,15 @@ create_filter_table(void)
 {
    unsigned i;
    if (!weightLut) {
-      weightLut = (float *) MALLOC(WEIGHT_LUT_SIZE * sizeof(float));
+      float *lut = (float *) MALLOC(WEIGHT_LUT_SIZE * sizeof(float));
 
       for (i = 0; i < WEIGHT_LUT_SIZE; ++i) {
-         float alpha = 2;
-         float r2 = (float) i / (float) (WEIGHT_LUT_SIZE - 1);
-         float weight = (float) exp(-alpha * r2);
-         weightLut[i] = weight;
+         const float alpha = 2;
+         const float r2 = (float) i / (float) (WEIGHT_LUT_SIZE - 1);
+         const float weight = (float) exp(-alpha * r2);
+         lut[i] = weight;
       }
+      weightLut = lut;
    }
 }
 
@@ -2248,15 +2209,15 @@ img_filter_2d_ewa(const struct sp_sampler_view *sp_sview,
    const struct pipe_resource *texture = sp_sview->base.texture;
 
    // ??? Won't the image filters blow up if level is negative?
-   unsigned level0 = level > 0 ? level : 0;
-   float scaling = 1.0f / (1 << level0);
-   int width = u_minify(texture->width0, level0);
-   int height = u_minify(texture->height0, level0);
+   const unsigned level0 = level > 0 ? level : 0;
+   const float scaling = 1.0f / (1 << level0);
+   const int width = u_minify(texture->width0, level0);
+   const int height = u_minify(texture->height0, level0);
    struct img_filter_args args;
-   float ux = dudx * scaling;
-   float vx = dvdx * scaling;
-   float uy = dudy * scaling;
-   float vy = dvdy * scaling;
+   const float ux = dudx * scaling;
+   const float vx = dvdx * scaling;
+   const float uy = dudy * scaling;
+   const float vy = dvdy * scaling;
 
    /* compute ellipse coefficients to bound the region: 
     * A*x*x + B*x*y + C*y*y = F.
@@ -2270,29 +2231,15 @@ img_filter_2d_ewa(const struct sp_sampler_view *sp_sview,
    /* assert(F > 0.0); */
 
    /* Compute the ellipse's (u,v) bounding box in texture space */
-   float d = -B*B+4.0f*C*A;
-   float box_u = 2.0f / d * sqrtf(d*C*F); /* box_u -> half of bbox with   */
-   float box_v = 2.0f / d * sqrtf(A*d*F); /* box_v -> half of bbox height */
+   const float d = -B*B+4.0f*C*A;
+   const float box_u = 2.0f / d * sqrtf(d*C*F); /* box_u -> half of bbox with   */
+   const float box_v = 2.0f / d * sqrtf(A*d*F); /* box_v -> half of bbox height */
 
    float rgba_temp[TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE];
    float s_buffer[TGSI_QUAD_SIZE];
    float t_buffer[TGSI_QUAD_SIZE];
    float weight_buffer[TGSI_QUAD_SIZE];
-   unsigned buffer_next;
    int j;
-   float den; /* = 0.0F; */
-   float ddq;
-   float U; /* = u0 - tex_u; */
-   int v;
-
-   /* Scale ellipse formula to directly index the Filter Lookup Table.
-    * i.e. scale so that F = WEIGHT_LUT_SIZE-1
-    */
-   double formScale = (double) (WEIGHT_LUT_SIZE - 1) / F;
-   A *= formScale;
-   B *= formScale;
-   C *= formScale;
-   /* F *= formScale; */ /* no need to scale F as we don't use it below here */
 
    /* For each quad, the du and dx values are the same and so the ellipse is
     * also the same. Note that texel/image access can only be performed using
@@ -2301,7 +2248,16 @@ img_filter_2d_ewa(const struct sp_sampler_view *sp_sview,
     * using the s_buffer/t_buffer and weight_buffer. Only when the buffer is
     * full, then the pixel values are read from the image.
     */
-   ddq = 2 * A;
+   const float ddq = 2 * A;
+
+   /* Scale ellipse formula to directly index the Filter Lookup Table.
+    * i.e. scale so that F = WEIGHT_LUT_SIZE-1
+    */
+   const double formScale = (double) (WEIGHT_LUT_SIZE - 1) / F;
+   A *= formScale;
+   B *= formScale;
+   C *= formScale;
+   /* F *= formScale; */ /* no need to scale F as we don't use it below here */
 
    args.level = level;
    for (j = 0; j < TGSI_QUAD_SIZE; j++) {
@@ -2309,22 +2265,23 @@ img_filter_2d_ewa(const struct sp_sampler_view *sp_sview,
        * and incrementally update the value of Ax^2+Bxy*Cy^2; when this
        * value, q, is less than F, we're inside the ellipse
        */
-      float tex_u = -0.5F + s[j] * texture->width0 * scaling;
-      float tex_v = -0.5F + t[j] * texture->height0 * scaling;
+      const float tex_u = -0.5F + s[j] * texture->width0 * scaling;
+      const float tex_v = -0.5F + t[j] * texture->height0 * scaling;
 
-      int u0 = (int) floorf(tex_u - box_u);
-      int u1 = (int) ceilf(tex_u + box_u);
-      int v0 = (int) floorf(tex_v - box_v);
-      int v1 = (int) ceilf(tex_v + box_v);
+      const int u0 = (int) floorf(tex_u - box_u);
+      const int u1 = (int) ceilf(tex_u + box_u);
+      const int v0 = (int) floorf(tex_v - box_v);
+      const int v1 = (int) ceilf(tex_v + box_v);
+      const float U = u0 - tex_u;
 
       float num[4] = {0.0F, 0.0F, 0.0F, 0.0F};
-      buffer_next = 0;
-      den = 0;
+      unsigned buffer_next = 0;
+      float den = 0;
+      int v;
       args.face_id = faces[j];
 
-      U = u0 - tex_u;
       for (v = v0; v <= v1; ++v) {
-         float V = v - tex_v;
+         const float V = v - tex_v;
          float dq = A * (2 * U + 1) + B * V;
          float q = (C * V + B * U) * V + A * U * U;
 
@@ -2338,7 +2295,7 @@ img_filter_2d_ewa(const struct sp_sampler_view *sp_sview,
                 * should not happen, though
                 */
                const int qClamped = q >= 0.0F ? q : 0;
-               float weight = weightLut[qClamped];
+               const float weight = weightLut[qClamped];
 
                weight_buffer[buffer_next] = weight;
                s_buffer[buffer_next] = u / ((float) width);
@@ -2458,12 +2415,12 @@ mip_filter_linear_aniso(const struct sp_sampler_view *sp_sview,
    float lambda;
    float lod[TGSI_QUAD_SIZE];
 
-   float s_to_u = u_minify(texture->width0, psview->u.tex.first_level);
-   float t_to_v = u_minify(texture->height0, psview->u.tex.first_level);
-   float dudx = (s[QUAD_BOTTOM_RIGHT] - s[QUAD_BOTTOM_LEFT]) * s_to_u;
-   float dudy = (s[QUAD_TOP_LEFT]     - s[QUAD_BOTTOM_LEFT]) * s_to_u;
-   float dvdx = (t[QUAD_BOTTOM_RIGHT] - t[QUAD_BOTTOM_LEFT]) * t_to_v;
-   float dvdy = (t[QUAD_TOP_LEFT]     - t[QUAD_BOTTOM_LEFT]) * t_to_v;
+   const float s_to_u = u_minify(texture->width0, psview->u.tex.first_level);
+   const float t_to_v = u_minify(texture->height0, psview->u.tex.first_level);
+   const float dudx = (s[QUAD_BOTTOM_RIGHT] - s[QUAD_BOTTOM_LEFT]) * s_to_u;
+   const float dudy = (s[QUAD_TOP_LEFT]     - s[QUAD_BOTTOM_LEFT]) * s_to_u;
+   const float dvdx = (t[QUAD_BOTTOM_RIGHT] - t[QUAD_BOTTOM_LEFT]) * t_to_v;
+   const float dvdy = (t[QUAD_TOP_LEFT]     - t[QUAD_BOTTOM_LEFT]) * t_to_v;
    struct img_filter_args args;
 
    if (filt_args->control == TGSI_SAMPLER_LOD_BIAS ||
@@ -2473,8 +2430,8 @@ mip_filter_linear_aniso(const struct sp_sampler_view *sp_sview,
       /* note: instead of working with Px and Py, we will use the 
        * squared length instead, to avoid sqrt.
        */
-      float Px2 = dudx * dudx + dvdx * dvdx;
-      float Py2 = dudy * dudy + dvdy * dvdy;
+      const float Px2 = dudx * dudx + dvdx * dvdx;
+      const float Py2 = dudy * dudy + dvdy * dvdy;
 
       float Pmax2;
       float Pmin2;
@@ -2585,7 +2542,7 @@ mip_filter_linear_2d_linear_repeat_POT(
    compute_lambda_lod(sp_sview, sp_samp, s, t, p, lod_in, filt_args->control, lod);
 
    for (j = 0; j < TGSI_QUAD_SIZE; j++) {
-      int level0 = psview->u.tex.first_level + (int)lod[j];
+      const int level0 = psview->u.tex.first_level + (int)lod[j];
       struct img_filter_args args;
       /* Catches both negative and large values of level0:
        */
@@ -2605,7 +2562,7 @@ mip_filter_linear_2d_linear_repeat_POT(
 
       }
       else {
-         float levelBlend = frac(lod[j]);
+         const float levelBlend = frac(lod[j]);
          float rgbax[TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE];
          int c;
 
@@ -2672,9 +2629,14 @@ sample_compare(const struct sp_sampler_view *sp_sview,
    int j, v;
    int k[TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE];
    float pc[4];
-   const struct util_format_description *format_desc;
-   unsigned chan_type;
-   bool is_gather = (control == TGSI_SAMPLER_GATHER);
+   const struct util_format_description *format_desc =
+      util_format_description(sp_sview->base.format);
+   /* not entirely sure we couldn't end up with non-valid swizzle here */
+   const unsigned chan_type =
+      format_desc->swizzle[0] <= UTIL_FORMAT_SWIZZLE_W ?
+      format_desc->channel[format_desc->swizzle[0]].type :
+      UTIL_FORMAT_TYPE_FLOAT;
+   const bool is_gather = (control == TGSI_SAMPLER_GATHER);
 
    /**
     * Compare texcoord 'p' (aka R) against texture value 'rgba[0]'
@@ -2701,11 +2663,6 @@ sample_compare(const struct sp_sampler_view *sp_sview,
       pc[3] = p[3];
    }
 
-   format_desc = util_format_description(sp_sview->base.format);
-   /* not entirely sure we couldn't end up with non-valid swizzle here */
-   chan_type = format_desc->swizzle[0] <= UTIL_FORMAT_SWIZZLE_W ?
-                  format_desc->channel[format_desc->swizzle[0]].type :
-                  UTIL_FORMAT_TYPE_FLOAT;
    if (chan_type != UTIL_FORMAT_TYPE_FLOAT) {
       /*
        * clamping is a result of conversion to texture format, hence
@@ -3280,24 +3237,24 @@ sp_get_texels(const struct sp_sampler_view *sp_sview,
    const struct pipe_resource *texture = sp_sview->base.texture;
    int j, c;
    const float *tx;
-   int width, height, depth;
-
-   addr.value = 0;
    /* TODO write a better test for LOD */
-   addr.bits.level = sp_sview->base.target == PIPE_BUFFER ? 0 :
-                        CLAMP(lod[0] + sp_sview->base.u.tex.first_level, 
-                              sp_sview->base.u.tex.first_level,
-                              sp_sview->base.u.tex.last_level);
+   const unsigned level =
+      sp_sview->base.target == PIPE_BUFFER ? 0 :
+      CLAMP(lod[0] + sp_sview->base.u.tex.first_level,
+            sp_sview->base.u.tex.first_level,
+            sp_sview->base.u.tex.last_level);
+   const int width = u_minify(texture->width0, level);
+   const int height = u_minify(texture->height0, level);
+   const int depth = u_minify(texture->depth0, level);
 
-   width = u_minify(texture->width0, addr.bits.level);
-   height = u_minify(texture->height0, addr.bits.level);
-   depth = u_minify(texture->depth0, addr.bits.level);
+   addr.value = 0;
+   addr.bits.level = level;
 
    switch (sp_sview->base.target) {
    case PIPE_BUFFER:
    case PIPE_TEXTURE_1D:
       for (j = 0; j < TGSI_QUAD_SIZE; j++) {
-         int x = CLAMP(v_i[j] + offset[0], 0, width - 1);
+         const int x = CLAMP(v_i[j] + offset[0], 0, width - 1);
          tx = get_texel_2d_no_border(sp_sview, addr, x, 0);
          for (c = 0; c < 4; c++) {
             rgba[c][j] = tx[c];
@@ -3306,9 +3263,9 @@ sp_get_texels(const struct sp_sampler_view *sp_sview,
       break;
    case PIPE_TEXTURE_1D_ARRAY:
       for (j = 0; j < TGSI_QUAD_SIZE; j++) {
-         int x = CLAMP(v_i[j] + offset[0], 0, width - 1);
-         int y = CLAMP(v_j[j], sp_sview->base.u.tex.first_layer,
-                       sp_sview->base.u.tex.last_layer);
+         const int x = CLAMP(v_i[j] + offset[0], 0, width - 1);
+         const int y = CLAMP(v_j[j], sp_sview->base.u.tex.first_layer,
+                             sp_sview->base.u.tex.last_layer);
          tx = get_texel_2d_no_border(sp_sview, addr, x, y);
          for (c = 0; c < 4; c++) {
             rgba[c][j] = tx[c];
@@ -3318,8 +3275,8 @@ sp_get_texels(const struct sp_sampler_view *sp_sview,
    case PIPE_TEXTURE_2D:
    case PIPE_TEXTURE_RECT:
       for (j = 0; j < TGSI_QUAD_SIZE; j++) {
-         int x = CLAMP(v_i[j] + offset[0], 0, width - 1);
-         int y = CLAMP(v_j[j] + offset[1], 0, height - 1);
+         const int x = CLAMP(v_i[j] + offset[0], 0, width - 1);
+         const int y = CLAMP(v_j[j] + offset[1], 0, height - 1);
          tx = get_texel_2d_no_border(sp_sview, addr, x, y);
          for (c = 0; c < 4; c++) {
             rgba[c][j] = tx[c];
@@ -3328,10 +3285,10 @@ sp_get_texels(const struct sp_sampler_view *sp_sview,
       break;
    case PIPE_TEXTURE_2D_ARRAY:
       for (j = 0; j < TGSI_QUAD_SIZE; j++) {
-         int x = CLAMP(v_i[j] + offset[0], 0, width - 1);
-         int y = CLAMP(v_j[j] + offset[1], 0, height - 1);
-         int layer = CLAMP(v_k[j], sp_sview->base.u.tex.first_layer,
-                           sp_sview->base.u.tex.last_layer);
+         const int x = CLAMP(v_i[j] + offset[0], 0, width - 1);
+         const int y = CLAMP(v_j[j] + offset[1], 0, height - 1);
+         const int layer = CLAMP(v_k[j], sp_sview->base.u.tex.first_layer,
+                                 sp_sview->base.u.tex.last_layer);
          tx = get_texel_3d_no_border(sp_sview, addr, x, y, layer);
          for (c = 0; c < 4; c++) {
             rgba[c][j] = tx[c];
@@ -3480,7 +3437,7 @@ softpipe_create_sampler_view(struct pipe_context *pipe,
                              const struct pipe_sampler_view *templ)
 {
    struct sp_sampler_view *sview = CALLOC_STRUCT(sp_sampler_view);
-   struct softpipe_resource *spr = (struct softpipe_resource *)resource;
+   const struct softpipe_resource *spr = (struct softpipe_resource *)resource;
 
    if (sview) {
       struct pipe_sampler_view *view = &sview->base;