| /************************************************************************** |
| * |
| * 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->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); |
| } |