mesa: Add texel fetch functions for BPTC-compressed textures

Adds functions to fetch from any of the four BPTC-compressed formats.

v2: Set the alpha component to 1.0 when fetching from the half-float formats
    instead of leaving it uninitialised. Don't linearize the alpha component
    when fetching from sRGB.

Reviewed-by: Ian Romanick <[email protected]>

1 files changed, 34 insertions, 0 deletions

diff --git a/src/mesa/main/texcompress_bptc.h b/src/mesa/main/texcompress_bptc.h
new file mode 100644
index 00000000000..ad5ff50a649
--- /dev/null
+++ b/src/mesa/main/texcompress_bptc.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2014 Intel Corporation
+ *
+ * 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 (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 NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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 TEXCOMPRESS_BPTC_H
+#define TEXCOMPRESS_BPTC_H
+
+#include <inttypes.h>
+#include "glheader.h"
+#include "texcompress.h"
+
+compressed_fetch_func
+_mesa_get_bptc_fetch_func(mesa_format format);
+
+#endif