llvmpipe: New module to help make assertions about formats.

src/gallium/drivers/llvmpipe/Makefile

@@ -17,6 +17,7 @@ C_SOURCES = \
 	lp_bld_depth.c \
 	lp_bld_flow.c \
 	lp_bld_format_aos.c \
+	lp_bld_format_query.c \
 	lp_bld_format_soa.c \
 	lp_bld_interp.c \
 	lp_bld_intr.c \

src/gallium/drivers/llvmpipe/SConscript

@@ -30,6 +30,7 @@ llvmpipe = env.ConvenienceLibrary(
 		'lp_bld_depth.c',
 		'lp_bld_flow.c',
 		'lp_bld_format_aos.c',
+        'lp_bld_format_query.c',
 		'lp_bld_format_soa.c',
 		'lp_bld_interp.c',
 		'lp_bld_intr.c',

src/gallium/drivers/llvmpipe/lp_bld_format.h

@@ -42,6 +42,10 @@ struct util_format_description;
 struct lp_type;
 
 
+boolean
+lp_format_is_rgba8(const struct util_format_description *desc);
+
+
 void
 lp_build_format_swizzle_soa(const struct util_format_description *format_desc,
                             struct lp_type type,

src/gallium/drivers/llvmpipe/lp_bld_format_query.c

@@ -0,0 +1,72 @@
+/**************************************************************************
+ *
+ * Copyright 2009 VMware, Inc.
+ * All Rights Reserved.
+ *
+ * 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, sub license, 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 (including the
+ * next paragraph) 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS 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.
+ *
+ **************************************************************************/
+
+/**
+ * @file
+ * Utility functions to make assertions about formats.
+ *
+ * This module centralizes most of logic used when determining what algorithm
+ * is most suitable (i.e., most efficient yet correct) for a given format.
+ *
+ * It might be possible to move some of these functions to u_format module,
+ * but since tiny differences in the format my render it more/less
+ * appropriate to a given algorithm it is impossible to make any long term
+ * guarantee about the semantics of these functions.
+ *
+ * @author Jose Fonseca <jfonseca@vmware.com>
+ */
+
+
+#include "util/u_format.h"
+
+#include "lp_bld_format.h"
+
+
+/**
+ * Whether this format is a 4 rgba8 variant
+ */
+boolean
+lp_format_is_rgba8(const struct util_format_description *desc)
+{
+   unsigned chan;
+
+   if(desc->block.width != 1 ||
+      desc->block.height != 1 ||
+      desc->block.bits != 32)
+      return FALSE;
+
+   for(chan = 0; chan < 4; ++chan) {
+      if(desc->channel[chan].type != UTIL_FORMAT_TYPE_UNSIGNED &&
+         desc->channel[chan].type != UTIL_FORMAT_TYPE_SIGNED &&
+         desc->channel[chan].type != UTIL_FORMAT_TYPE_VOID)
+         return FALSE;
+      if(desc->channel[chan].size != 8)
+         return FALSE;
+   }
+
+   return TRUE;
+}