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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 3770 | Serge | 1 | /************************************************************************** |
| 2 | * |
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| 3 | * Copyright 2010 VMware, Inc. |
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| 4 | * All Rights Reserved. |
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| 5 | * |
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| 6 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 7 | * copy of this software and associated documentation files (the |
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| 8 | * "Software"), to deal in the Software without restriction, including |
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| 9 | * without limitation the rights to use, copy, modify, merge, publish, |
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| 10 | * distribute, sub license, and/or sell copies of the Software, and to |
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| 11 | * permit persons to whom the Software is furnished to do so, subject to |
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| 12 | * the following conditions: |
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| 13 | * |
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| 14 | * The above copyright notice and this permission notice (including the |
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| 15 | * next paragraph) shall be included in all copies or substantial portions |
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| 16 | * of the Software. |
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| 17 | * |
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| 18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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| 19 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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| 20 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. |
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| 21 | * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR |
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| 22 | * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
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| 23 | * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
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| 24 | * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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| 25 | * |
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| 26 | **************************************************************************/ |
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| 27 | |||
| 28 | |||
| 29 | #include "u_format.h" |
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| 30 | #include "u_sampler.h" |
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| 31 | |||
| 32 | |||
| 33 | /** |
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| 34 | * Initialize a pipe_sampler_view. 'view' is considered to have |
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| 35 | * uninitialized contents. |
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| 36 | */ |
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| 37 | static void |
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| 38 | default_template(struct pipe_sampler_view *view, |
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| 39 | const struct pipe_resource *texture, |
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| 40 | enum pipe_format format, |
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| 41 | unsigned expand_green_blue) |
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| 42 | { |
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| 43 | memset(view, 0, sizeof(*view)); |
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| 44 | |||
| 45 | /* XXX: Check if format is compatible with texture->format. |
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| 46 | */ |
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| 47 | |||
| 48 | view->format = format; |
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| 49 | view->u.tex.first_level = 0; |
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| 50 | view->u.tex.last_level = texture->last_level; |
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| 51 | view->u.tex.first_layer = 0; |
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| 52 | view->u.tex.last_layer = texture->target == PIPE_TEXTURE_3D ? |
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| 53 | texture->depth0 - 1 : texture->array_size - 1; |
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| 54 | view->swizzle_r = PIPE_SWIZZLE_RED; |
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| 55 | view->swizzle_g = PIPE_SWIZZLE_GREEN; |
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| 56 | view->swizzle_b = PIPE_SWIZZLE_BLUE; |
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| 57 | view->swizzle_a = PIPE_SWIZZLE_ALPHA; |
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| 58 | |||
| 59 | /* Override default green and blue component expansion to the requested |
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| 60 | * one. |
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| 61 | * |
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| 62 | * Gallium expands nonexistent components to (0,0,0,1), DX9 expands |
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| 63 | * to (1,1,1,1). Since alpha is always expanded to 1, and red is |
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| 64 | * always present, we only really care about green and blue |
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| 65 | * components. |
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| 66 | * |
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| 67 | * To make it look less hackish, one would have to add |
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| 68 | * UTIL_FORMAT_SWIZZLE_EXPAND to indicate components for expansion |
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| 69 | * and then override without exceptions or favoring one component |
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| 70 | * over another. |
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| 71 | */ |
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| 72 | if (format != PIPE_FORMAT_A8_UNORM) { |
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| 73 | const struct util_format_description *desc = util_format_description(format); |
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| 74 | |||
| 75 | assert(desc); |
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| 76 | if (desc) { |
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| 77 | if (desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_0) { |
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| 78 | view->swizzle_g = expand_green_blue; |
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| 79 | } |
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| 80 | if (desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_0) { |
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| 81 | view->swizzle_b = expand_green_blue; |
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| 82 | } |
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| 83 | } |
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| 84 | } |
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| 85 | } |
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| 86 | |||
| 87 | void |
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| 88 | u_sampler_view_default_template(struct pipe_sampler_view *view, |
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| 89 | const struct pipe_resource *texture, |
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| 90 | enum pipe_format format) |
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| 91 | { |
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| 92 | /* Expand to (0, 0, 0, 1) */ |
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| 93 | default_template(view, |
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| 94 | texture, |
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| 95 | format, |
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| 96 | PIPE_SWIZZLE_ZERO); |
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| 97 | } |
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| 98 | |||
| 99 | void |
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| 100 | u_sampler_view_default_dx9_template(struct pipe_sampler_view *view, |
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| 101 | const struct pipe_resource *texture, |
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| 102 | enum pipe_format format) |
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| 103 | { |
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| 104 | /* Expand to (1, 1, 1, 1) */ |
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| 105 | default_template(view, |
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| 106 | texture, |
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| 107 | format, |
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| 108 | PIPE_SWIZZLE_ONE); |
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| 109 | } |