104 lines
3.2 KiB
C
104 lines
3.2 KiB
C
/**************************************************************************
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*
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* Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
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* All Rights Reserved.
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* Copyright 2008 VMware, Inc. All rights reserved.
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* Copyright 2009 Marek Olšák <maraeo@gmail.com>
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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 TUNGSTEN GRAPHICS 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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/**
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* @file
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* Texture mapping utility functions.
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*
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* @author Brian Paul
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* Marek Olšák
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*/
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#include "pipe/p_defines.h"
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#include "util/u_debug.h"
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#include "util/u_texture.h"
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void util_map_texcoords2d_onto_cubemap(unsigned face,
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const float *in_st, unsigned in_stride,
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float *out_str, unsigned out_stride)
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{
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int i;
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float rx, ry, rz;
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/* loop over quad verts */
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for (i = 0; i < 4; i++) {
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/* Compute sc = +/-scale and tc = +/-scale.
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* Not +/-1 to avoid cube face selection ambiguity near the edges,
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* though that can still sometimes happen with this scale factor...
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*/
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const float scale = 0.9999f;
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const float sc = (2 * in_st[0] - 1) * scale;
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const float tc = (2 * in_st[1] - 1) * scale;
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switch (face) {
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case PIPE_TEX_FACE_POS_X:
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rx = 1;
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ry = -tc;
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rz = -sc;
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break;
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case PIPE_TEX_FACE_NEG_X:
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rx = -1;
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ry = -tc;
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rz = sc;
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break;
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case PIPE_TEX_FACE_POS_Y:
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rx = sc;
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ry = 1;
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rz = tc;
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break;
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case PIPE_TEX_FACE_NEG_Y:
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rx = sc;
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ry = -1;
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rz = -tc;
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break;
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case PIPE_TEX_FACE_POS_Z:
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rx = sc;
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ry = -tc;
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rz = 1;
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break;
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case PIPE_TEX_FACE_NEG_Z:
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rx = -sc;
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ry = -tc;
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rz = -1;
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break;
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default:
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rx = ry = rz = 0;
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assert(0);
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}
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out_str[0] = rx; /*s*/
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out_str[1] = ry; /*t*/
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out_str[2] = rz; /*r*/
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in_st += in_stride;
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out_str += out_stride;
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}
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}
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