mesa: add new pixel format unpacking code

This will be used instead of the texel fetch code to unpack images
in various formats.

src/mesa/SConscript

@@ -72,6 +72,7 @@ main_sources = [
     'main/ffvertex_prog.c',
     'main/fog.c',
     'main/formats.c',
+    'main/format_unpack.c',
     'main/framebuffer.c',
     'main/get.c',
     'main/getstring.c',

src/mesa/main/format_unpack.h

@@ -0,0 +1,49 @@
+/*
+ * Mesa 3-D graphics library
+ *
+ * Copyright (c) 2011 VMware, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef FORMAT_UNPACK_H
+#define FORMAT_UNPACK_H
+
+extern void
+_mesa_unpack_rgba_row(gl_format format, GLuint n,
+                      const void *src, GLfloat dst[][4]);
+
+
+extern void
+_mesa_unpack_rgba_block(gl_format format,
+                        const void *src, GLint srcRowStride,
+                        GLfloat dst[][4], GLint dstRowStride,
+                        GLuint x, GLuint y, GLuint width, GLuint height);
+
+
+extern void
+_mesa_unpack_float_z_row(gl_format format, GLuint n,
+                         const void *src, GLfloat *dst);
+
+
+void
+_mesa_unpack_uint_z_row(gl_format format, GLuint n,
+                        const void *src, GLuint *dst);
+
+
+#endif /* FORMAT_UNPACK_H */

src/mesa/sources.mak

@@ -43,6 +43,7 @@ MAIN_SOURCES = \
 	main/ffvertex_prog.c \
 	main/fog.c \
 	main/formats.c \
+	main/format_unpack.c \
 	main/framebuffer.c \
 	main/get.c \
 	main/getstring.c \