From: Marek Olšák Date: Sat, 12 Dec 2009 22:38:17 +0000 (+0100) Subject: util: add a function which converts 2D coordinates to cubemap coordinates X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=4c61022b4a19f020ef8f6c635ecffa54a914fd7a;p=mesa.git util: add a function which converts 2D coordinates to cubemap coordinates The code was taken over from u_gen_mipmap. --- diff --git a/src/gallium/auxiliary/util/Makefile b/src/gallium/auxiliary/util/Makefile index 863ced5e938..c36a87a8091 100644 --- a/src/gallium/auxiliary/util/Makefile +++ b/src/gallium/auxiliary/util/Makefile @@ -31,6 +31,7 @@ C_SOURCES = \ u_stream_stdc.c \ u_stream_wd.c \ u_surface.c \ + u_texture.c \ u_tile.c \ u_time.c \ u_timed_winsys.c \ diff --git a/src/gallium/auxiliary/util/SConscript b/src/gallium/auxiliary/util/SConscript index 379f3da91e3..6e34c3b7dd7 100644 --- a/src/gallium/auxiliary/util/SConscript +++ b/src/gallium/auxiliary/util/SConscript @@ -49,6 +49,7 @@ util = env.ConvenienceLibrary( 'u_stream_stdc.c', 'u_stream_wd.c', 'u_surface.c', + 'u_texture.c', 'u_tile.c', 'u_time.c', 'u_timed_winsys.c', diff --git a/src/gallium/auxiliary/util/u_gen_mipmap.c b/src/gallium/auxiliary/util/u_gen_mipmap.c index 1728e661cdb..69ff3b9dd9e 100644 --- a/src/gallium/auxiliary/util/u_gen_mipmap.c +++ b/src/gallium/auxiliary/util/u_gen_mipmap.c @@ -46,6 +46,7 @@ #include "util/u_gen_mipmap.h" #include "util/u_simple_shaders.h" #include "util/u_math.h" +#include "util/u_texture.h" #include "cso_cache/cso_context.h" @@ -1383,59 +1384,9 @@ set_vertex_data(struct gen_mipmap_state *ctx, static const float st[4][2] = { {0.0f, 0.0f}, {1.0f, 0.0f}, {1.0f, 1.0f}, {0.0f, 1.0f} }; - float rx, ry, rz; - uint i; - - /* loop over quad verts */ - for (i = 0; i < 4; i++) { - /* Compute sc = +/-scale and tc = +/-scale. - * Not +/-1 to avoid cube face selection ambiguity near the edges, - * though that can still sometimes happen with this scale factor... - */ - const float scale = 0.9999f; - const float sc = (2.0f * st[i][0] - 1.0f) * scale; - const float tc = (2.0f * st[i][1] - 1.0f) * scale; - - switch (face) { - case PIPE_TEX_FACE_POS_X: - rx = 1.0f; - ry = -tc; - rz = -sc; - break; - case PIPE_TEX_FACE_NEG_X: - rx = -1.0f; - ry = -tc; - rz = sc; - break; - case PIPE_TEX_FACE_POS_Y: - rx = sc; - ry = 1.0f; - rz = tc; - break; - case PIPE_TEX_FACE_NEG_Y: - rx = sc; - ry = -1.0f; - rz = -tc; - break; - case PIPE_TEX_FACE_POS_Z: - rx = sc; - ry = -tc; - rz = 1.0f; - break; - case PIPE_TEX_FACE_NEG_Z: - rx = -sc; - ry = -tc; - rz = -1.0f; - break; - default: - rx = ry = rz = 0.0f; - assert(0); - } - ctx->vertices[i][1][0] = rx; /*s*/ - ctx->vertices[i][1][1] = ry; /*t*/ - ctx->vertices[i][1][2] = rz; /*r*/ - } + util_map_texcoords2d_onto_cubemap(face, &st[0][0], 2, + &ctx->vertices[0][1][0], 8); } else { /* 1D/2D */ diff --git a/src/gallium/auxiliary/util/u_texture.c b/src/gallium/auxiliary/util/u_texture.c new file mode 100644 index 00000000000..cd477ab640f --- /dev/null +++ b/src/gallium/auxiliary/util/u_texture.c @@ -0,0 +1,102 @@ +/************************************************************************** + * + * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas. + * All Rights Reserved. + * Copyright 2008 VMware, Inc. All rights reserved. + * Copyright 2009 Marek Olšák + * + * 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 TUNGSTEN GRAPHICS 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. + * + **************************************************************************/ + +/** + * @file + * Texture mapping utility functions. + * + * @author Brian Paul + * Marek Olšák + */ + +#include "pipe/p_defines.h" + +#include "util/u_texture.h" + +void util_map_texcoords2d_onto_cubemap(unsigned face, + const float *in_st, unsigned in_stride, + float *out_str, unsigned out_stride) +{ + int i; + float rx, ry, rz; + + /* loop over quad verts */ + for (i = 0; i < 4; i++) { + /* Compute sc = +/-scale and tc = +/-scale. + * Not +/-1 to avoid cube face selection ambiguity near the edges, + * though that can still sometimes happen with this scale factor... + */ + const float scale = 0.9999f; + const float sc = (2 * in_st[0] - 1) * scale; + const float tc = (2 * in_st[1] - 1) * scale; + + switch (face) { + case PIPE_TEX_FACE_POS_X: + rx = 1; + ry = -tc; + rz = -sc; + break; + case PIPE_TEX_FACE_NEG_X: + rx = -1; + ry = -tc; + rz = sc; + break; + case PIPE_TEX_FACE_POS_Y: + rx = sc; + ry = 1; + rz = tc; + break; + case PIPE_TEX_FACE_NEG_Y: + rx = sc; + ry = -1; + rz = -tc; + break; + case PIPE_TEX_FACE_POS_Z: + rx = sc; + ry = -tc; + rz = 1; + break; + case PIPE_TEX_FACE_NEG_Z: + rx = -sc; + ry = -tc; + rz = -1; + break; + default: + rx = ry = rz = 0; + assert(0); + } + + out_str[0] = rx; /*s*/ + out_str[1] = ry; /*t*/ + out_str[2] = rz; /*r*/ + + in_st += in_stride; + out_str += out_stride; + } +} diff --git a/src/gallium/auxiliary/util/u_texture.h b/src/gallium/auxiliary/util/u_texture.h new file mode 100644 index 00000000000..93b2f1e4c97 --- /dev/null +++ b/src/gallium/auxiliary/util/u_texture.h @@ -0,0 +1,54 @@ +/************************************************************************** + * + * Copyright 2009 Marek Olšák + * + * 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 TUNGSTEN GRAPHICS 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. + * + **************************************************************************/ + +#ifndef U_TEXTURE_H +#define U_TEXTURE_H + +#ifdef __cplusplus +extern "C" { +#endif + +/** + * Convert 2D texture coordinates of 4 vertices into cubemap coordinates + * in the given face. + * Coordinates must be in the range [0,1]. + * + * \param face Cubemap face. + * \param in_st 4 pairs of 2D texture coordinates to convert. + * \param in_stride Stride of in_st in floats. + * \param out_str STR cubemap texture coordinates to compute. + * \param out_stride Stride of out_str in floats. + */ +void util_map_texcoords2d_onto_cubemap(unsigned face, + const float *in_st, unsigned in_stride, + float *out_str, unsigned out_stride); + + +#ifdef __cplusplus +} +#endif + +#endif