110 lines
3.8 KiB
C
110 lines
3.8 KiB
C
/**************************************************************************
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*
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* Copyright 2010 VMware, Inc.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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#include "u_format.h"
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#include "u_sampler.h"
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/**
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* Initialize a pipe_sampler_view. 'view' is considered to have
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* uninitialized contents.
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*/
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static void
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default_template(struct pipe_sampler_view *view,
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const struct pipe_resource *texture,
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enum pipe_format format,
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unsigned expand_green_blue)
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{
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memset(view, 0, sizeof(*view));
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/* XXX: Check if format is compatible with texture->format.
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*/
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view->format = format;
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view->u.tex.first_level = 0;
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view->u.tex.last_level = texture->last_level;
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view->u.tex.first_layer = 0;
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view->u.tex.last_layer = texture->target == PIPE_TEXTURE_3D ?
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texture->depth0 - 1 : texture->array_size - 1;
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view->swizzle_r = PIPE_SWIZZLE_RED;
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view->swizzle_g = PIPE_SWIZZLE_GREEN;
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view->swizzle_b = PIPE_SWIZZLE_BLUE;
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view->swizzle_a = PIPE_SWIZZLE_ALPHA;
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/* Override default green and blue component expansion to the requested
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* one.
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*
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* Gallium expands nonexistent components to (0,0,0,1), DX9 expands
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* to (1,1,1,1). Since alpha is always expanded to 1, and red is
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* always present, we only really care about green and blue
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* components.
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*
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* To make it look less hackish, one would have to add
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* UTIL_FORMAT_SWIZZLE_EXPAND to indicate components for expansion
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* and then override without exceptions or favoring one component
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* over another.
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*/
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if (format != PIPE_FORMAT_A8_UNORM) {
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const struct util_format_description *desc = util_format_description(format);
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assert(desc);
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if (desc) {
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if (desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_0) {
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view->swizzle_g = expand_green_blue;
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}
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if (desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_0) {
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view->swizzle_b = expand_green_blue;
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}
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}
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}
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}
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void
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u_sampler_view_default_template(struct pipe_sampler_view *view,
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const struct pipe_resource *texture,
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enum pipe_format format)
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{
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/* Expand to (0, 0, 0, 1) */
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default_template(view,
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texture,
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format,
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PIPE_SWIZZLE_ZERO);
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}
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void
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u_sampler_view_default_dx9_template(struct pipe_sampler_view *view,
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const struct pipe_resource *texture,
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enum pipe_format format)
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{
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/* Expand to (1, 1, 1, 1) */
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default_template(view,
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texture,
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format,
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PIPE_SWIZZLE_ONE);
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}
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