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| 5564 | serge | 1 | /************************************************************************** |
| 2 | * |
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| 3 | * Copyright 2008 VMware, Inc. |
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| 4 | * All Rights Reserved. |
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| 5 | * Copyright 2008 VMware, Inc. All rights reserved. |
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| 6 | * Copyright 2009 Marek Olšák |
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| 7 | * |
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| 8 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 9 | * copy of this software and associated documentation files (the |
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| 10 | * "Software"), to deal in the Software without restriction, including |
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| 11 | * without limitation the rights to use, copy, modify, merge, publish, |
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| 12 | * distribute, sub license, and/or sell copies of the Software, and to |
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| 13 | * permit persons to whom the Software is furnished to do so, subject to |
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| 14 | * the following conditions: |
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| 15 | * |
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| 16 | * The above copyright notice and this permission notice (including the |
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| 17 | * next paragraph) shall be included in all copies or substantial portions |
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| 18 | * of the Software. |
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| 19 | * |
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| 20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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| 21 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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| 22 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. |
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| 23 | * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR |
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| 24 | * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
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| 25 | * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
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| 26 | * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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| 27 | * |
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| 28 | **************************************************************************/ |
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| 29 | |||
| 30 | /** |
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| 31 | * @file |
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| 32 | * Texture mapping utility functions. |
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| 33 | * |
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| 34 | * @author Brian Paul |
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| 35 | * Marek Olšák |
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| 36 | */ |
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| 37 | |||
| 38 | #include "pipe/p_defines.h" |
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| 39 | |||
| 40 | #include "util/u_debug.h" |
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| 41 | #include "util/u_texture.h" |
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| 42 | |||
| 43 | void util_map_texcoords2d_onto_cubemap(unsigned face, |
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| 44 | const float *in_st, unsigned in_stride, |
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| 45 | float *out_str, unsigned out_stride, |
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| 46 | boolean allow_scale) |
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| 47 | { |
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| 48 | int i; |
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| 49 | float rx, ry, rz; |
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| 50 | |||
| 51 | /* loop over quad verts */ |
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| 52 | for (i = 0; i < 4; i++) { |
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| 53 | /* Compute sc = +/-scale and tc = +/-scale. |
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| 54 | * Not +/-1 to avoid cube face selection ambiguity near the edges, |
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| 55 | * though that can still sometimes happen with this scale factor... |
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| 56 | * |
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| 57 | * XXX: Yep, there is no safe scale factor that will prevent sampling |
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| 58 | * the neighbouring face when stretching out. A more reliable solution |
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| 59 | * would be to clamp (sc, tc) against +/- 1.0-1.0/mipsize, in the shader. |
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| 60 | * |
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| 61 | * Also, this is not necessary when minifying, or 1:1 blits. |
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| 62 | */ |
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| 63 | const float scale = allow_scale ? 0.9999f : 1.0f; |
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| 64 | const float sc = (2 * in_st[0] - 1) * scale; |
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| 65 | const float tc = (2 * in_st[1] - 1) * scale; |
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| 66 | |||
| 67 | switch (face) { |
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| 68 | case PIPE_TEX_FACE_POS_X: |
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| 69 | rx = 1; |
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| 70 | ry = -tc; |
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| 71 | rz = -sc; |
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| 72 | break; |
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| 73 | case PIPE_TEX_FACE_NEG_X: |
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| 74 | rx = -1; |
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| 75 | ry = -tc; |
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| 76 | rz = sc; |
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| 77 | break; |
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| 78 | case PIPE_TEX_FACE_POS_Y: |
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| 79 | rx = sc; |
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| 80 | ry = 1; |
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| 81 | rz = tc; |
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| 82 | break; |
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| 83 | case PIPE_TEX_FACE_NEG_Y: |
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| 84 | rx = sc; |
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| 85 | ry = -1; |
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| 86 | rz = -tc; |
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| 87 | break; |
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| 88 | case PIPE_TEX_FACE_POS_Z: |
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| 89 | rx = sc; |
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| 90 | ry = -tc; |
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| 91 | rz = 1; |
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| 92 | break; |
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| 93 | case PIPE_TEX_FACE_NEG_Z: |
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| 94 | rx = -sc; |
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| 95 | ry = -tc; |
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| 96 | rz = -1; |
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| 97 | break; |
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| 98 | default: |
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| 99 | rx = ry = rz = 0; |
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| 100 | assert(0); |
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| 101 | } |
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| 102 | |||
| 103 | out_str[0] = rx; /*s*/ |
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| 104 | out_str[1] = ry; /*t*/ |
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| 105 | out_str[2] = rz; /*r*/ |
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| 106 | |||
| 107 | in_st += in_stride; |
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| 108 | out_str += out_stride; |
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| 109 | } |
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| 110 | } |