mesa: Autogenerate most of format_pack.c

We were auto-generating it before.  The problem was that the autogeneration
tool we were using was called "copy, paste, and edit".  Let's use a more
sensible solution.

Signed-off-by: Jason Ekstrand <jason.ekstrand@intel.com>

v2 by Samuel Iglesias <siglesias@igalia.com>
- Remove format_pack.c as it is now autogenerated
- Add usage of INDENT_FLAGS in Makefile.am
- Remove trailing blank line

v3 by Samuel Iglesias <siglesias@igalia.com>
- Merge format_convert.py into format_parser.py
   - Adapt pack_*_* function generations
- Fix out-of-tree build

v4 by Samuel Iglesias <siglesias@igalia.com>
- _get_datatype() is now a helper function

v5 by Samuel Iglesias <siglesias@igalia.com>
- format_pack.c.mako is now format_pack.py, with the template code
  inlined. It now auto-generates format_pack.c
- Simplify Makefile.am change.
- Modify SConscript to build format_pack.c with scons.
- Remove run_mako.py
- Add format_pack.c to gitignore

v6 by Samuel Iglesias <siglesias@igalia.com>:
- Don't allow float to non-normalized integer format conversions.
- Add non-normalized formats support for ubyte packing functions. Merge
the previously separated patch.
- Add clamping for non-normalized integer formats in pack_ubyte*()

v7 by Samuel Iglesias <siglesias@igalia.com>:
- Add assert to check that sRGB formats are 8-bit size.

Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/src/mesa/main/format_parser.py b/src/mesa/main/format_parser.py
index 5e45c74..522bce3 100755
--- a/src/mesa/main/format_parser.py
+++ b/src/mesa/main/format_parser.py
@@ -102,6 +102,10 @@ class Channel:
       """Returns true if the size of this channel is a power of two."""
       return is_power_of_two(self.size)
 
+   def datatype(self):
+      """Returns the datatype corresponding to a channel type and size"""
+      return _get_datatype(self.type, self.size)
+
 class Swizzle:
    """Describes a swizzle operation.
 
@@ -469,6 +473,49 @@ class Format:
             return channel
       return None
 
+   def datatype(self):
+      """Returns the datatype corresponding to a format's channel type and size"""
+      if self.layout == PACKED:
+         if self.block_size() == 8:
+            return 'uint8_t'
+         if self.block_size() == 16:
+            return 'uint16_t'
+         if self.block_size() == 32:
+            return 'uint32_t'
+         else:
+            assert False
+      else:
+         return _get_datatype(self.channel_type(), self.channel_size())
+
+def _get_datatype(type, size):
+   if type == FLOAT:
+      if size == 32:
+         return 'float'
+      elif size == 16:
+         return 'uint16_t'
+      else:
+         assert False
+   elif type == UNSIGNED:
+      if size <= 8:
+         return 'uint8_t'
+      elif size <= 16:
+         return 'uint16_t'
+      elif size <= 32:
+         return 'uint32_t'
+      else:
+         assert False
+   elif type == SIGNED:
+      if size <= 8:
+         return 'int8_t'
+      elif size <= 16:
+         return 'int16_t'
+      elif size <= 32:
+         return 'int32_t'
+      else:
+         assert False
+   else:
+      assert False
+
 def _parse_channels(fields, layout, colorspace, swizzle):
    channels = []
    for field in fields: