mesa/format_pack: Add _mesa_pack_int_rgba_row()

This will be used to unify code in pack.c.

v2:
- Modify pack_int_*() function generator to use c.datatype() and
  f.datatype()

v3:
- Only autogenerate pack_int_*() functions for non-normalized integer
  formats.

v4:
- Use _mesa_unsigned_to_unsigned() in pack_int_*() because, in order
  to be able to pack both signed and unsigned formats, we need to
  sign-extend.

Signed-off-by: Samuel Iglesias Gonsalvez <[email protected]>
Reviewed-by: Jason Ekstrand <[email protected]>

2 files changed, 88 insertions, 0 deletions

diff --git a/src/mesa/main/format_pack.h b/src/mesa/main/format_pack.h
index 1582ad12b3d..6087fc381b1 100644
--- a/src/mesa/main/format_pack.h
+++ b/src/mesa/main/format_pack.h
@@ -68,6 +68,9 @@ extern gl_pack_ubyte_stencil_func
 _mesa_get_pack_ubyte_stencil_func(mesa_format format);
 
 
+extern void
+_mesa_pack_int_rgba_row(mesa_format format, GLuint n,
+                          const GLint src[][4], void *dst);
 
 extern void
 _mesa_pack_float_rgba_row(mesa_format format, GLuint n,
diff --git a/src/mesa/main/format_pack.py b/src/mesa/main/format_pack.py
index f141da83ca4..e734e31a798 100644
--- a/src/mesa/main/format_pack.py
+++ b/src/mesa/main/format_pack.py
@@ -214,6 +214,59 @@ pack_uint_${f.short_name()}(const GLuint src[4], void *dst)
 }
 %endfor
 
+/* int packing functions */
+
+%for f in rgb_formats:
+   %if not f.is_int():
+      <% continue %>
+   %elif f.is_normalized():
+      <% continue %>
+   %elif f.is_compressed():
+      <% continue %>
+   %endif
+
+static inline void
+pack_int_${f.short_name()}(const GLint src[4], void *dst)
+{
+   %for (i, c) in enumerate(f.channels):
+      <% i = f.swizzle.inverse()[i] %>
+      %if c.type == 'x':
+         <% continue %>
+      %endif
+
+      ${c.datatype()} ${c.name} =
+      %if c.type == parser.SIGNED:
+         _mesa_signed_to_signed(src[${i}], ${c.size});
+      %elif c.type == parser.UNSIGNED:
+         _mesa_unsigned_to_unsigned(src[${i}], ${c.size});
+      %else:
+         assert(!"Invalid type: only integer types are allowed");
+      %endif
+   %endfor
+
+   %if f.layout == parser.ARRAY:
+      ${f.datatype()} *d = (${f.datatype()} *)dst;
+      %for (i, c) in enumerate(f.channels):
+         %if c.type == 'x':
+            <% continue %>
+         %endif
+         d[${i}] = ${c.name};
+      %endfor
+   %elif f.layout == parser.PACKED:
+      ${f.datatype()} d = 0;
+      %for (i, c) in enumerate(f.channels):
+         %if c.type == 'x':
+            <% continue %>
+         %endif
+         d |= PACK(${c.name}, ${c.shift}, ${c.size});
+      %endfor
+      (*(${f.datatype()} *)dst) = d;
+   %else:
+      <% assert False %>
+   %endif
+}
+%endfor
+
 /* float packing functions */
 
 %for f in rgb_formats:
@@ -397,6 +450,38 @@ _mesa_pack_uint_rgba_row(mesa_format format, GLuint n,
 }
 
 /**
+ * Pack a row of GLint rgba[4] values to the destination.
+ */
+void
+_mesa_pack_int_rgba_row(mesa_format format, GLuint n,
+                          const GLint src[][4], void *dst)
+{
+   GLuint i;
+   GLubyte *d = dst;
+
+   switch (format) {
+%for f in rgb_formats:
+   %if not f.is_int():
+      <% continue %>
+   %elif f.is_normalized():
+      <% continue %>
+   %elif f.is_compressed():
+      <% continue %>
+   %endif
+
+   case ${f.name}:
+      for (i = 0; i < n; ++i) {
+         pack_int_${f.short_name()}(src[i], d);
+         d += ${f.block_size() / 8};
+      }
+      break;
+%endfor
+   default:
+      assert(!"Invalid format");
+   }
+}
+
+/**
  * Pack a row of GLfloat rgba[4] values to the destination.
  */
 void