diff options
Diffstat (limited to 'src/gallium/auxiliary/util/u_sampler.c')
-rw-r--r-- | src/gallium/auxiliary/util/u_sampler.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/util/u_sampler.c b/src/gallium/auxiliary/util/u_sampler.c new file mode 100644 index 00000000000..e77f562ea22 --- /dev/null +++ b/src/gallium/auxiliary/util/u_sampler.c @@ -0,0 +1,100 @@ +/************************************************************************** + * + * 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" + + +static void +default_template(struct pipe_sampler_view *view, + const struct pipe_resource *texture, + enum pipe_format format, + unsigned expand_green_blue) +{ + /* XXX: Check if format is compatible with texture->format. + */ + + view->format = format; + view->first_level = 0; + view->last_level = texture->last_level; + 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); +} |