gallium: Fix llvmpipe on big-endian machines

Squashed commit of the following:

commit 0857a7e105bfcbc4d1431b2cc56612094c747ca3
Author: Richard Sandiford <r.sandiford@uk.ibm.com>
Date:   Tue Jun 18 12:25:07 2013 -0400

    gallivm: Fix lp_build_rgba8_to_fi32_soa for big endian

    Reviewed-by: Adam Jackson <ajax@redhat.com>
    Signed-off-by: Richard Sandiford <r.sandiford@uk.ibm.com>

commit 0d65131649a8aa140e2db228ba779d685c4333e3
Author: Richard Sandiford <r.sandiford@uk.ibm.com>
Date:   Tue Jun 18 12:25:07 2013 -0400

    gallivm: Fix big-endian machines

    This adds a bit-shift count to the format table, and adds the concept of
    vector or bitwise alignment on gathers.

    Reviewed-by: Adam Jackson <ajax@redhat.com>
    Signed-off-by: Richard Sandiford <r.sandiford@uk.ibm.com>

commit 9740bda9b7dc894b629ed38be9b51059ce90818f
Author: Richard Sandiford <r.sandiford@uk.ibm.com>
Date:   Tue Jun 18 12:25:07 2013 -0400

    llvmpipe: Fix convert_to_blend_type on big-endian

    Reviewed-by: Adam Jackson <ajax@redhat.com>
    Signed-off-by: Richard Sandiford <r.sandiford@uk.ibm.com>

commit ae037c2de0f029e4e99371c0de25560484f0d8df
Author: Richard Sandiford <r.sandiford@uk.ibm.com>
Date:   Tue Jun 18 12:25:06 2013 -0400

    util: Convert color pack to packed formats

    This fixes them on big-endian.

    Reviewed-by: Adam Jackson <ajax@redhat.com>
    Signed-off-by: Richard Sandiford <r.sandiford@uk.ibm.com>

commit 5b05ac0c89ae092ea8ba5bba9f739708d7396b5c
Author: Richard Sandiford <r.sandiford@uk.ibm.com>
Date:   Tue Jun 18 12:25:06 2013 -0400

    graw-xlib: Convert to packed formats

    Reviewed-by: Adam Jackson <ajax@redhat.com>
    Signed-off-by: Richard Sandiford <r.sandiford@uk.ibm.com>

commit 51396e7d098cb6ff794391cf11afe4dbf86dbea0
Author: Richard Sandiford <r.sandiford@uk.ibm.com>
Date:   Tue Jun 18 12:25:06 2013 -0400

    format: Convert to packed formats

    Reviewed-by: Adam Jackson <ajax@redhat.com>
    Signed-off-by: Richard Sandiford <r.sandiford@uk.ibm.com>

commit 417b60bc66eb450e68a92ab0e47f76e292b385e6
Author: Adam Jackson <ajax@redhat.com>
Date:   Tue Jun 18 12:25:06 2013 -0400

    st/dri: Convert to packed formats

    Reviewed-by: Adam Jackson <ajax@redhat.com>
    Signed-off-by: Richard Sandiford <r.sandiford@uk.ibm.com>

commit 0934b2e022a5e0847d312c40734e2b44cac52fd8
Author: Richard Sandiford <r.sandiford@uk.ibm.com>
Date:   Tue Jun 18 12:25:06 2013 -0400

    st/xlib: Convert to packed formats

    Reviewed-by: Adam Jackson <ajax@redhat.com>
    Signed-off-by: Richard Sandiford <r.sandiford@uk.ibm.com>

commit a307ea3c3716a706963acce7966b5e405ba11db9
Author: Richard Sandiford <r.sandiford@uk.ibm.com>
Date:   Tue Jun 18 12:25:06 2013 -0400

    gbm: Convert to packed formats

    Reviewed-by: Adam Jackson <ajax@redhat.com>
    Signed-off-by: Richard Sandiford <r.sandiford@uk.ibm.com>

commit 53eebdd253e1960a645ea278f31d7ef6a6cf4aeb
Author: Richard Sandiford <r.sandiford@uk.ibm.com>
Date:   Tue Jun 18 12:25:06 2013 -0400

    tests: Convert to packed formats

    Reviewed-by: Adam Jackson <ajax@redhat.com>
    Signed-off-by: Richard Sandiford <r.sandiford@uk.ibm.com>

commit 2f77fe3ee524945eacd546efcac34f7799fb3124
Author: Adam Jackson <ajax@redhat.com>
Date:   Tue Jun 18 13:07:37 2013 -0400

    gallium: Document packed formats

    Signed-off-by: Adam Jackson <ajax@redhat.com>

commit 1f1017159ce951f922210a430de9229f91f62714
Author: Richard Sandiford <r.sandiford@uk.ibm.com>
Date:   Tue Jun 18 12:25:06 2013 -0400

    gallium: Introduce 32-bit packed format names

    These are for interacting with buffers natively described in terms of
    bit shifts, like X11 visuals:

        uint32_t xyzw8888 = (x << 0) | (y << 8) | (z << 16) | (w << 24);

    Define these in terms of (endian-dependent) aliases to the array-style
    format names.

    Reviewed-by: Adam Jackson <ajax@redhat.com>
    Signed-off-by: Richard Sandiford <r.sandiford@uk.ibm.com>

commit 6cc7ab1ee66ed668da78c1d951dfd7782b4e786a
Author: Adam Jackson <ajax@redhat.com>
Date:   Mon Jun 3 12:10:32 2013 -0400

    gallium: Document format name conventions

    v2:
    - Fix a channel name thinko (Michel Dänzer)
    - Elaborate on SCALED versus INT
    - Add links to DirectX and FOURCC docs

    Signed-off-by: Adam Jackson <ajax@redhat.com>

commit df4d269e7fb62051a3c029b84147465001e5776e
Author: Adam Jackson <ajax@redhat.com>
Date:   Tue Jun 18 12:25:06 2013 -0400

    gallivm: Remove all notion of byte-swapping

    Signed-off-by: Adam Jackson <ajax@redhat.com>

Signed-off-by: Adam Jackson <ajax@redhat.com>

2 files changed, 21 insertions, 28 deletions

diff --git a/src/gallium/drivers/llvmpipe/lp_bld_depth.c b/src/gallium/drivers/llvmpipe/lp_bld_depth.c
index 79891cf5d83..06556dcba7a 100644
--- a/src/gallium/drivers/llvmpipe/lp_bld_depth.c
+++ b/src/gallium/drivers/llvmpipe/lp_bld_depth.c
@@ -349,8 +349,6 @@ get_z_shift_and_mask(const struct util_format_description *format_desc,
 {
    unsigned total_bits;
    unsigned z_swizzle;
-   unsigned chan;
-   unsigned padding_left, padding_right;
 
    assert(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS);
    assert(format_desc->block.width == 1);
@@ -365,25 +363,14 @@ get_z_shift_and_mask(const struct util_format_description *format_desc,
       return FALSE;
 
    *width = format_desc->channel[z_swizzle].size;
+   *shift = format_desc->channel[z_swizzle].shift;
 
-   padding_right = 0;
-   for (chan = 0; chan < z_swizzle; ++chan)
-      padding_right += format_desc->channel[chan].size;
-
-   padding_left =
-      total_bits - (padding_right + *width);
-
-   if (padding_left || padding_right) {
-      unsigned long long mask_left = (1ULL << (total_bits - padding_left)) - 1;
-      unsigned long long mask_right = (1ULL << (padding_right)) - 1;
-      *mask = mask_left ^ mask_right;
-   }
-   else {
+   if (*width == total_bits) {
       *mask = 0xffffffff;
+   } else {
+      *mask = ((1 << *width) - 1) << *shift;
    }
 
-   *shift = padding_right;
-
    return TRUE;
 }
 
@@ -398,7 +385,7 @@ get_s_shift_and_mask(const struct util_format_description *format_desc,
                      unsigned *shift, unsigned *mask)
 {
    unsigned s_swizzle;
-   unsigned chan, sz;
+   unsigned sz;
 
    s_swizzle = format_desc->swizzle[1];
 
@@ -407,16 +394,14 @@ get_s_shift_and_mask(const struct util_format_description *format_desc,
 
    /* just special case 64bit d/s format */
    if (format_desc->block.bits > 32) {
+      /* XXX big-endian? */
       assert(format_desc->format == PIPE_FORMAT_Z32_FLOAT_S8X24_UINT);
       *shift = 0;
       *mask = 0xff;
       return TRUE;
    }
 
-   *shift = 0;
-   for (chan = 0; chan < s_swizzle; chan++)
-      *shift += format_desc->channel[chan].size;
-
+   *shift = format_desc->channel[s_swizzle].shift;
    sz = format_desc->channel[s_swizzle].size;
    *mask = (1U << sz) - 1U;
 
diff --git a/src/gallium/drivers/llvmpipe/lp_state_fs.c b/src/gallium/drivers/llvmpipe/lp_state_fs.c
index fc2ba5ed9dc..38e9fc7d736 100644
--- a/src/gallium/drivers/llvmpipe/lp_state_fs.c
+++ b/src/gallium/drivers/llvmpipe/lp_state_fs.c
@@ -1015,12 +1015,17 @@ convert_to_blend_type(struct gallivm_state *gallivm,
    for (i = 0; i < num_srcs; ++i) {
       LLVMValueRef chans[4];
       LLVMValueRef res = NULL;
-      unsigned sa = 0;
 
       dst[i] = LLVMBuildZExt(builder, src[i], lp_build_vec_type(gallivm, src_type), "");
 
       for (j = 0; j < src_fmt->nr_channels; ++j) {
          unsigned mask = 0;
+         unsigned sa = src_fmt->channel[j].shift;
+#ifdef PIPE_ARCH_LITTLE_ENDIAN
+         unsigned from_lsb = j;
+#else
+         unsigned from_lsb = src_fmt->nr_channels - j - 1;
+#endif
 
          for (k = 0; k < src_fmt->channel[j].size; ++k) {
             mask |= 1 << k;
@@ -1046,11 +1051,9 @@ convert_to_blend_type(struct gallivm_state *gallivm,
          /* Insert bits into correct position */
          chans[j] = LLVMBuildShl(builder,
                                  chans[j],
-                                 lp_build_const_int_vec(gallivm, src_type, j * blend_type.width),
+                                 lp_build_const_int_vec(gallivm, src_type, from_lsb * blend_type.width),
                                  "");
 
-         sa += src_fmt->channel[j].size;
-
          if (j == 0) {
             res = chans[j];
          } else {
@@ -1166,12 +1169,17 @@ convert_from_blend_type(struct gallivm_state *gallivm,
    for (i = 0; i < num_srcs; ++i) {
       LLVMValueRef chans[4];
       LLVMValueRef res = NULL;
-      unsigned sa = 0;
 
       dst[i] = LLVMBuildBitCast(builder, src[i], lp_build_vec_type(gallivm, src_type), "");
 
       for (j = 0; j < src_fmt->nr_channels; ++j) {
          unsigned mask = 0;
+         unsigned sa = src_fmt->channel[j].shift;
+#ifdef PIPE_ARCH_LITTLE_ENDIAN
+         unsigned from_lsb = j;
+#else
+         unsigned from_lsb = src_fmt->nr_channels - j - 1;
+#endif
 
          assert(blend_type.width > src_fmt->channel[j].size);
 
@@ -1182,7 +1190,7 @@ convert_from_blend_type(struct gallivm_state *gallivm,
          /* Extract bits */
          chans[j] = LLVMBuildLShr(builder,
                                   dst[i],
-                                  lp_build_const_int_vec(gallivm, src_type, j * blend_type.width),
+                                  lp_build_const_int_vec(gallivm, src_type, from_lsb * blend_type.width),
                                   "");
 
          chans[j] = LLVMBuildAnd(builder,