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/**************************************************************************
*
* Copyright 2010 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.
*
**************************************************************************/
#include "u_format.h"
#include "u_sampler.h"
/**
* Initialize a pipe_sampler_view. 'view' is considered to have
* uninitialized contents.
*/
static void
default_template(struct pipe_sampler_view *view,
const struct pipe_resource *texture,
enum pipe_format format,
unsigned expand_green_blue)
{
memset(view, 0, sizeof(*view));
/* XXX: Check if format is compatible with texture->format.
*/
view->target = texture->target;
view->format = format;
view->u.tex.first_level = 0;
view->u.tex.last_level = texture->last_level;
view->u.tex.first_layer = 0;
view->u.tex.last_layer = texture->target == PIPE_TEXTURE_3D ?
texture->depth0 - 1 : texture->array_size - 1;
view->swizzle_r = PIPE_SWIZZLE_RED;
view->swizzle_g = PIPE_SWIZZLE_GREEN;
view->swizzle_b = PIPE_SWIZZLE_BLUE;
view->swizzle_a = PIPE_SWIZZLE_ALPHA;
/* Override default green and blue component expansion to the requested
* one.
*
* Gallium expands nonexistent components to (0,0,0,1), DX9 expands
* to (1,1,1,1). Since alpha is always expanded to 1, and red is
* always present, we only really care about green and blue
* components.
*
* To make it look less hackish, one would have to add
* UTIL_FORMAT_SWIZZLE_EXPAND to indicate components for expansion
* and then override without exceptions or favoring one component
* over another.
*/
if (format != PIPE_FORMAT_A8_UNORM) {
const struct util_format_description *desc = util_format_description(format);
assert(desc);
if (desc) {
if (desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_0) {
view->swizzle_g = expand_green_blue;
}
if (desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_0) {
view->swizzle_b = expand_green_blue;
}
}
}
}
void
u_sampler_view_default_template(struct pipe_sampler_view *view,
const struct pipe_resource *texture,
enum pipe_format format)
{
/* Expand to (0, 0, 0, 1) */
default_template(view,
texture,
format,
PIPE_SWIZZLE_ZERO);
}
void
u_sampler_view_default_dx9_template(struct pipe_sampler_view *view,
const struct pipe_resource *texture,
enum pipe_format format)
{
/* Expand to (1, 1, 1, 1) */
default_template(view,
texture,
format,
PIPE_SWIZZLE_ONE);
}
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