Mesa (master): glformats: add _mesa_base_format_component_count
Jordan Justen
jljusten at kemper.freedesktop.org
Sat Jan 12 10:12:27 UTC 2013
Module: Mesa
Branch: master
Commit: 89e07ccf613e6a5f65acc597ce888d4c12014647
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=89e07ccf613e6a5f65acc597ce888d4c12014647
Author: Jordan Justen <jordan.l.justen at intel.com>
Date: Thu Dec 27 16:45:13 2012 -0800
glformats: add _mesa_base_format_component_count
Signed-off-by: Jordan Justen <jordan.l.justen at intel.com>
Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>
---
src/mesa/main/glformats.c | 26 ++++++++++++++++++++++++++
src/mesa/main/glformats.h | 3 +++
2 files changed, 29 insertions(+), 0 deletions(-)
diff --git a/src/mesa/main/glformats.c b/src/mesa/main/glformats.c
index 5683d4b..fb69421 100644
--- a/src/mesa/main/glformats.c
+++ b/src/mesa/main/glformats.c
@@ -1058,6 +1058,32 @@ _mesa_base_format_has_channel(GLenum base_format, GLenum pname)
/**
+ * Returns the number of channels/components for a base format.
+ */
+GLint
+_mesa_base_format_component_count(GLenum base_format)
+{
+ switch (base_format) {
+ case GL_RED:
+ case GL_ALPHA:
+ case GL_INTENSITY:
+ case GL_DEPTH_COMPONENT:
+ return 1;
+ case GL_RG:
+ case GL_LUMINANCE_ALPHA:
+ case GL_DEPTH_STENCIL:
+ return 2;
+ case GL_RGB:
+ return 3;
+ case GL_RGBA:
+ return 4;
+ default:
+ return -1;
+ }
+}
+
+
+/**
* If format is a generic compressed format, return the corresponding
* non-compressed format. For other formats, return the format as-is.
*/
diff --git a/src/mesa/main/glformats.h b/src/mesa/main/glformats.h
index d1208ef..fe604dd 100644
--- a/src/mesa/main/glformats.h
+++ b/src/mesa/main/glformats.h
@@ -100,6 +100,9 @@ _mesa_base_format_to_integer_format(GLenum format);
extern GLboolean
_mesa_base_format_has_channel(GLenum base_format, GLenum pname);
+extern GLint
+_mesa_base_format_component_count(GLenum base_format);
+
extern GLenum
_mesa_generic_compressed_format_to_uncompressed_format(GLenum format);
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