mesa/formats: Add layout and swizzle information

v2: Move the MESA_FORMAT_SWIZZLE enum to the top of the file

Signed-off-by: Jason Ekstrand <jason.ekstrand@intel.com>
Reviewed-by: Brian Paul <brianp@vmware.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/src/mesa/main/formats.h b/src/mesa/main/formats.h
index dc50bc8..8b7dee4 100644
--- a/src/mesa/main/formats.h
+++ b/src/mesa/main/formats.h
@@ -56,6 +56,29 @@ extern "C" {
  */
 #define MAX_PIXEL_BYTES 16
 
+/**
+ * Specifies the layout of a pixel format.  See the MESA_FORMAT
+ * documentation below.
+ */
+enum mesa_format_layout {
+   MESA_FORMAT_LAYOUT_ARRAY,
+   MESA_FORMAT_LAYOUT_PACKED,
+   MESA_FORMAT_LAYOUT_OTHER,
+};
+
+/**
+ * An enum representing different possible swizzling values.  This is used
+ * to interpret the output of _mesa_get_format_swizzle
+ */
+enum {
+   MESA_FORMAT_SWIZZLE_X = 0,
+   MESA_FORMAT_SWIZZLE_Y = 1,
+   MESA_FORMAT_SWIZZLE_Z = 2,
+   MESA_FORMAT_SWIZZLE_W = 3,
+   MESA_FORMAT_SWIZZLE_ZERO = 4,
+   MESA_FORMAT_SWIZZLE_ONE = 5,
+   MESA_FORMAT_SWIZZLE_NONE = 6,
+};
 
 /**
  * Mesa texture/renderbuffer image formats.
@@ -419,6 +442,9 @@ _mesa_get_format_bits(mesa_format format, GLenum pname);
 extern GLuint
 _mesa_get_format_max_bits(mesa_format format);
 
+extern enum mesa_format_layout
+_mesa_get_format_layout(mesa_format format);
+
 extern GLenum
 _mesa_get_format_datatype(mesa_format format);
 
@@ -428,6 +454,9 @@ _mesa_get_format_base_format(mesa_format format);
 extern void
 _mesa_get_format_block_size(mesa_format format, GLuint *bw, GLuint *bh);
 
+extern void
+_mesa_get_format_swizzle(mesa_format format, uint8_t swizzle_out[4]);
+
 extern GLboolean
 _mesa_is_format_compressed(mesa_format format);