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>

5 files changed, 56 insertions, 48 deletions

diff --git a/src/gallium/auxiliary/util/u_format.h b/src/gallium/auxiliary/util/u_format.h
index 4cace6a..9774a2b 100644
--- a/src/gallium/auxiliary/util/u_format.h
+++ b/src/gallium/auxiliary/util/u_format.h
@@ -133,6 +133,7 @@ struct util_format_channel_description
    unsigned normalized:1;
    unsigned pure_integer:1;
    unsigned size:9;        /**< bits per channel */
+   unsigned shift:16;      /** number of bits from lsb */
 };
 
 
@@ -179,9 +180,31 @@ struct util_format_description
    unsigned is_mixed:1;
 
    /**
-    * Input channel description.
+    * Input channel description, in the order XYZW.
     *
     * Only valid for UTIL_FORMAT_LAYOUT_PLAIN formats.
+    *
+    * If each channel is accessed as an individual N-byte value, X is always
+    * at the lowest address in memory, Y is always next, and so on.  For all
+    * currently-defined formats, the N-byte value has native endianness.
+    *
+    * If instead a group of channels is accessed as a single N-byte value,
+    * the order of the channels within that value depends on endianness.
+    * For big-endian targets, X is the most significant subvalue,
+    * otherwise it is the least significant one.
+    *
+    * For example, if X is 8 bits and Y is 24 bits, the memory order is:
+    *
+    *                 0  1  2  3
+    *  little-endian: X  Yl Ym Yu    (l = lower, m = middle, u = upper)
+    *  big-endian:    X  Yu Ym Yl
+    *
+    * If X is 5 bits, Y is 5 bits, Z is 5 bits and W is 1 bit, the layout is:
+    *
+    *                        0        1
+    *                 msb  lsb msb  lsb
+    *  little-endian: YYYXXXXX WZZZZZYY
+    *  big-endian:    XXXXXYYY YYZZZZZW
     */
    struct util_format_channel_description channel[4];
 
diff --git a/src/gallium/auxiliary/util/u_format_pack.py b/src/gallium/auxiliary/util/u_format_pack.py
index 565d059..d1f68c8 100644
--- a/src/gallium/auxiliary/util/u_format_pack.py
+++ b/src/gallium/auxiliary/util/u_format_pack.py
@@ -99,15 +99,6 @@ def generate_format_type(format):
     print
 
 
-def bswap_format(format):
-    '''Generate a structure that describes the format.'''
-
-    if format.is_bitmask() and not format.is_array() and format.block_size() > 8:
-        print '#ifdef PIPE_ARCH_BIG_ENDIAN'
-        print '   pixel.value = util_bswap%u(pixel.value);' % format.block_size()
-        print '#endif'
-
-
 def is_format_supported(format):
     '''Determines whether we actually have the plumbing necessary to generate the 
     to read/write to/from this format.'''
@@ -423,16 +414,11 @@ def generate_unpack_kernel(format, dst_channel, dst_native_type):
             elif src_channel.type == SIGNED:
                 print '         int%u_t %s;' % (depth, src_channel.name)
 
-        if depth > 8:
-            print '#ifdef PIPE_ARCH_BIG_ENDIAN'
-            print '         value = util_bswap%u(value);' % depth
-            print '#endif'
-
         # Compute the intermediate unshifted values 
-        shift = 0
         for i in range(format.nr_channels()):
             src_channel = format.channels[i]
             value = 'value'
+            shift = src_channel.shift
             if src_channel.type == UNSIGNED:
                 if shift:
                     value = '%s >> %u' % (value, shift)
@@ -455,8 +441,6 @@ def generate_unpack_kernel(format, dst_channel, dst_native_type):
             if value is not None:
                 print '         %s = %s;' % (src_channel.name, value)
                 
-            shift += src_channel.size
-
         # Convert, swizzle, and store final values
         for i in range(4):
             swizzle = format.swizzles[i]
@@ -484,7 +468,6 @@ def generate_unpack_kernel(format, dst_channel, dst_native_type):
     else:
         print '         union util_format_%s pixel;' % format.short_name()
         print '         memcpy(&pixel, src, sizeof pixel);'
-        bswap_format(format)
     
         for i in range(4):
             swizzle = format.swizzles[i]
@@ -525,9 +508,9 @@ def generate_pack_kernel(format, src_channel, src_native_type):
         depth = format.block_size()
         print '         uint%u_t value = 0;' % depth 
 
-        shift = 0
         for i in range(4):
             dst_channel = format.channels[i]
+            shift = dst_channel.shift
             if inv_swizzle[i] is not None:
                 value ='src[%u]' % inv_swizzle[i]
                 dst_colorspace = format.colorspace
@@ -551,13 +534,6 @@ def generate_pack_kernel(format, src_channel, src_native_type):
                 if value is not None:
                     print '         value |= %s;' % (value)
                 
-            shift += dst_channel.size
-
-        if depth > 8:
-            print '#ifdef PIPE_ARCH_BIG_ENDIAN'
-            print '         value = util_bswap%u(value);' % depth
-            print '#endif'
-        
         print '         *(uint%u_t *)dst = value;' % depth 
 
     else:
@@ -579,7 +555,6 @@ def generate_pack_kernel(format, src_channel, src_native_type):
                                     dst_colorspace = dst_colorspace)
             print '         pixel.chan.%s = %s;' % (dst_channel.name, value)
     
-        bswap_format(format)
         print '         memcpy(dst, &pixel, sizeof pixel);'
     
 
diff --git a/src/gallium/auxiliary/util/u_format_parse.py b/src/gallium/auxiliary/util/u_format_parse.py
index 07052b9..e202099 100755
--- a/src/gallium/auxiliary/util/u_format_parse.py
+++ b/src/gallium/auxiliary/util/u_format_parse.py
@@ -30,6 +30,8 @@
 '''
 
 
+import sys
+
 VOID, UNSIGNED, SIGNED, FIXED, FLOAT = range(5)
 
 SWIZZLE_X, SWIZZLE_Y, SWIZZLE_Z, SWIZZLE_W, SWIZZLE_0, SWIZZLE_1, SWIZZLE_NONE, = range(7)
@@ -42,6 +44,9 @@ YUV = 'yuv'
 ZS = 'zs'
 
 
+# Not cross-compiler friendly
+is_big_endian = sys.byteorder == 'big'
+
 def is_pot(x):
    return (x & (x - 1)) == 0
 
@@ -307,6 +312,11 @@ def parse(filename):
             channel = Channel(type, norm, pure, size, names[i])
             channels.append(channel)
 
+        shift = 0
+        for channel in channels[3::-1] if is_big_endian else channels:
+            channel.shift = shift
+            shift += channel.size
+
         format = Format(name, layout, block_width, block_height, channels, swizzles, colorspace)
         formats.append(format)
     return formats
diff --git a/src/gallium/auxiliary/util/u_format_table.py b/src/gallium/auxiliary/util/u_format_table.py
index 8edb505..9d44cf3 100755
--- a/src/gallium/auxiliary/util/u_format_table.py
+++ b/src/gallium/auxiliary/util/u_format_table.py
@@ -114,9 +114,9 @@ def write_format_table(formats):
             else:
                 sep = ""
             if channel.size:
-                print "      {%s, %s, %s, %u}%s\t/* %s = %s */" % (type_map[channel.type], bool_map(channel.norm), bool_map(channel.pure), channel.size, sep, "xyzw"[i], channel.name)
+                print "      {%s, %s, %s, %u, %u}%s\t/* %s = %s */" % (type_map[channel.type], bool_map(channel.norm), bool_map(channel.pure), channel.size, channel.shift, sep, "xyzw"[i], channel.name)
             else:
-                print "      {0, 0, 0, 0}%s" % (sep,)
+                print "      {0, 0, 0, 0, 0}%s" % (sep,)
         print "   },"
         print "   {"
         for i in range(4):
diff --git a/src/gallium/auxiliary/util/u_pack_color.h b/src/gallium/auxiliary/util/u_pack_color.h
index 1f6a56a..102ad60 100644
--- a/src/gallium/auxiliary/util/u_pack_color.h
+++ b/src/gallium/auxiliary/util/u_pack_color.h
@@ -65,32 +65,32 @@ util_pack_color_ub(ubyte r, ubyte g, ubyte b, ubyte a,
                    enum pipe_format format, union util_color *uc)
 {
    switch (format) {
-   case PIPE_FORMAT_A8B8G8R8_UNORM:
+   case PIPE_FORMAT_ABGR8888_UNORM:
       {
          uc->ui = (r << 24) | (g << 16) | (b << 8) | a;
       }
       return;
-   case PIPE_FORMAT_X8B8G8R8_UNORM:
+   case PIPE_FORMAT_XBGR8888_UNORM:
       {
          uc->ui = (r << 24) | (g << 16) | (b << 8) | 0xff;
       }
       return;
-   case PIPE_FORMAT_B8G8R8A8_UNORM:
+   case PIPE_FORMAT_BGRA8888_UNORM:
       {
          uc->ui = (a << 24) | (r << 16) | (g << 8) | b;
       }
       return;
-   case PIPE_FORMAT_B8G8R8X8_UNORM:
+   case PIPE_FORMAT_BGRX8888_UNORM:
       {
          uc->ui = (0xff << 24) | (r << 16) | (g << 8) | b;
       }
       return;
-   case PIPE_FORMAT_A8R8G8B8_UNORM:
+   case PIPE_FORMAT_ARGB8888_UNORM:
       {
          uc->ui = (b << 24) | (g << 16) | (r << 8) | a;
       }
       return;
-   case PIPE_FORMAT_X8R8G8B8_UNORM:
+   case PIPE_FORMAT_XRGB8888_UNORM:
       {
          uc->ui = (b << 24) | (g << 16) | (r << 8) | 0xff;
       }
@@ -166,7 +166,7 @@ util_unpack_color_ub(enum pipe_format format, union util_color *uc,
                      ubyte *r, ubyte *g, ubyte *b, ubyte *a)
 {
    switch (format) {
-   case PIPE_FORMAT_A8B8G8R8_UNORM:
+   case PIPE_FORMAT_ABGR8888_UNORM:
       {
          uint p = uc->ui;
          *r = (ubyte) ((p >> 24) & 0xff);
@@ -175,7 +175,7 @@ util_unpack_color_ub(enum pipe_format format, union util_color *uc,
          *a = (ubyte) ((p >>  0) & 0xff);
       }
       return;
-   case PIPE_FORMAT_X8B8G8R8_UNORM:
+   case PIPE_FORMAT_XBGR8888_UNORM:
       {
          uint p = uc->ui;
          *r = (ubyte) ((p >> 24) & 0xff);
@@ -184,7 +184,7 @@ util_unpack_color_ub(enum pipe_format format, union util_color *uc,
          *a = (ubyte) 0xff;
       }
       return;
-   case PIPE_FORMAT_B8G8R8A8_UNORM:
+   case PIPE_FORMAT_BGRA8888_UNORM:
       {
          uint p = uc->ui;
          *r = (ubyte) ((p >> 16) & 0xff);
@@ -193,7 +193,7 @@ util_unpack_color_ub(enum pipe_format format, union util_color *uc,
          *a = (ubyte) ((p >> 24) & 0xff);
       }
       return;
-   case PIPE_FORMAT_B8G8R8X8_UNORM:
+   case PIPE_FORMAT_BGRX8888_UNORM:
       {
          uint p = uc->ui;
          *r = (ubyte) ((p >> 16) & 0xff);
@@ -202,7 +202,7 @@ util_unpack_color_ub(enum pipe_format format, union util_color *uc,
          *a = (ubyte) 0xff;
       }
       return;
-   case PIPE_FORMAT_A8R8G8B8_UNORM:
+   case PIPE_FORMAT_ARGB8888_UNORM:
       {
          uint p = uc->ui;
          *r = (ubyte) ((p >>  8) & 0xff);
@@ -211,7 +211,7 @@ util_unpack_color_ub(enum pipe_format format, union util_color *uc,
          *a = (ubyte) ((p >>  0) & 0xff);
       }
       return;
-   case PIPE_FORMAT_X8R8G8B8_UNORM:
+   case PIPE_FORMAT_XRGB8888_UNORM:
       {
          uint p = uc->ui;
          *r = (ubyte) ((p >>  8) & 0xff);
@@ -350,32 +350,32 @@ util_pack_color(const float rgba[4], enum pipe_format format, union util_color *
    }
 
    switch (format) {
-   case PIPE_FORMAT_A8B8G8R8_UNORM:
+   case PIPE_FORMAT_ABGR8888_UNORM:
       {
          uc->ui = (r << 24) | (g << 16) | (b << 8) | a;
       }
       return;
-   case PIPE_FORMAT_X8B8G8R8_UNORM:
+   case PIPE_FORMAT_XBGR8888_UNORM:
       {
          uc->ui = (r << 24) | (g << 16) | (b << 8) | 0xff;
       }
       return;
-   case PIPE_FORMAT_B8G8R8A8_UNORM:
+   case PIPE_FORMAT_BGRA8888_UNORM:
       {
          uc->ui = (a << 24) | (r << 16) | (g << 8) | b;
       }
       return;
-   case PIPE_FORMAT_B8G8R8X8_UNORM:
+   case PIPE_FORMAT_BGRX8888_UNORM:
       {
          uc->ui = (0xff << 24) | (r << 16) | (g << 8) | b;
       }
       return;
-   case PIPE_FORMAT_A8R8G8B8_UNORM:
+   case PIPE_FORMAT_ARGB8888_UNORM:
       {
          uc->ui = (b << 24) | (g << 16) | (r << 8) | a;
       }
       return;
-   case PIPE_FORMAT_X8R8G8B8_UNORM:
+   case PIPE_FORMAT_XRGB8888_UNORM:
       {
          uc->ui = (b << 24) | (g << 16) | (r << 8) | 0xff;
       }