--- /dev/null
+/*
+ * The 3D Studio File Format Library
+ * Copyright (C) 1996-2001 by J.E. Hoffmann <je-h@gmx.net>
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * $Id: atmosphere.c,v 1.9 2001/07/07 19:05:30 jeh Exp $
+ */
+#define LIB3DS_EXPORT
+#include <lib3ds/atmosphere.h>
+#include <lib3ds/chunk.h>
+#include <lib3ds/io.h>
+
+
+/*!
+ * \defgroup atmosphere Atmosphere Settings
+ *
+ * \author J.E. Hoffmann <je-h@gmx.net>
+ */
+
+
+static Lib3dsBool
+fog_read(Lib3dsFog *fog, Lib3dsIo *io)
+{
+ Lib3dsChunk c;
+ Lib3dsWord chunk;
+
+ if (!lib3ds_chunk_read_start(&c, LIB3DS_FOG, io)) {
+ return(LIB3DS_FALSE);
+ }
+ fog->near_plane = lib3ds_io_read_float(io);
+ fog->near_density=lib3ds_io_read_float(io);
+ fog->far_plane=lib3ds_io_read_float(io);
+ fog->far_density=lib3ds_io_read_float(io);
+ lib3ds_chunk_read_tell(&c, io);
+
+ while ((chunk=lib3ds_chunk_read_next(&c, io))!=0) {
+ switch (chunk) {
+ case LIB3DS_LIN_COLOR_F:
+ {
+ int i;
+ for (i=0; i<3; ++i) {
+ fog->col[i]=lib3ds_io_read_float(io);
+ }
+ }
+ break;
+ case LIB3DS_COLOR_F:
+ break;
+ case LIB3DS_FOG_BGND:
+ {
+ fog->fog_background=LIB3DS_TRUE;
+ }
+ break;
+ default:
+ lib3ds_chunk_unknown(chunk);
+ }
+ }
+
+ lib3ds_chunk_read_end(&c, io);
+ return(LIB3DS_TRUE);
+}
+
+
+static Lib3dsBool
+layer_fog_read(Lib3dsLayerFog *fog, Lib3dsIo *io)
+{
+ Lib3dsChunk c;
+ Lib3dsWord chunk;
+
+ if (!lib3ds_chunk_read_start(&c, LIB3DS_LAYER_FOG, io)) {
+ return(LIB3DS_FALSE);
+ }
+ fog->near_y=lib3ds_io_read_float(io);
+ fog->far_y=lib3ds_io_read_float(io);
+ fog->density=lib3ds_io_read_float(io);
+ fog->flags=lib3ds_io_read_dword(io);
+ lib3ds_chunk_read_tell(&c, io);
+
+ while ((chunk=lib3ds_chunk_read_next(&c, io))!=0) {
+ switch (chunk) {
+ case LIB3DS_LIN_COLOR_F:
+ lib3ds_io_read_rgb(io, fog->col);
+ break;
+ case LIB3DS_COLOR_F:
+ lib3ds_io_read_rgb(io, fog->col);
+ break;
+ default:
+ lib3ds_chunk_unknown(chunk);
+ }
+ }
+
+ lib3ds_chunk_read_end(&c, io);
+ return(LIB3DS_TRUE);
+}
+
+
+static Lib3dsBool
+distance_cue_read(Lib3dsDistanceCue *cue, Lib3dsIo *io)
+{
+ Lib3dsChunk c;
+ Lib3dsWord chunk;
+
+ if (!lib3ds_chunk_read_start(&c, LIB3DS_DISTANCE_CUE, io)) {
+ return(LIB3DS_FALSE);
+ }
+ cue->near_plane=lib3ds_io_read_float(io);
+ cue->near_dimming=lib3ds_io_read_float(io);
+ cue->far_plane=lib3ds_io_read_float(io);
+ cue->far_dimming=lib3ds_io_read_float(io);
+ lib3ds_chunk_read_tell(&c, io);
+
+ while ((chunk=lib3ds_chunk_read_next(&c, io))!=0) {
+ switch (chunk) {
+ case LIB3DS_DCUE_BGND:
+ {
+ cue->cue_background=LIB3DS_TRUE;
+ }
+ break;
+ default:
+ lib3ds_chunk_unknown(chunk);
+ }
+ }
+
+ lib3ds_chunk_read_end(&c, io);
+ return(LIB3DS_TRUE);
+}
+
+
+/*!
+ * \ingroup atmosphere
+ */
+Lib3dsBool
+lib3ds_atmosphere_read(Lib3dsAtmosphere *atmosphere, Lib3dsIo *io)
+{
+ Lib3dsChunk c;
+
+ if (!lib3ds_chunk_read(&c, io)) {
+ return(LIB3DS_FALSE);
+ }
+
+ switch (c.chunk) {
+ case LIB3DS_FOG:
+ {
+ lib3ds_chunk_read_reset(&c, io);
+ if (!fog_read(&atmosphere->fog, io)) {
+ return(LIB3DS_FALSE);
+ }
+ }
+ break;
+ case LIB3DS_LAYER_FOG:
+ {
+ lib3ds_chunk_read_reset(&c, io);
+ if (!layer_fog_read(&atmosphere->layer_fog, io)) {
+ return(LIB3DS_FALSE);
+ }
+ }
+ break;
+ case LIB3DS_DISTANCE_CUE:
+ {
+ lib3ds_chunk_read_reset(&c, io);
+ if (!distance_cue_read(&atmosphere->dist_cue, io)) {
+ return(LIB3DS_FALSE);
+ }
+ }
+ break;
+ case LIB3DS_USE_FOG:
+ {
+ atmosphere->fog.use=LIB3DS_TRUE;
+ }
+ break;
+ case LIB3DS_USE_LAYER_FOG:
+ {
+ atmosphere->fog.use=LIB3DS_TRUE;
+ }
+ break;
+ case LIB3DS_USE_DISTANCE_CUE:
+ {
+ atmosphere->dist_cue.use=LIB3DS_TRUE;
+ }
+ break;
+ }
+
+ return(LIB3DS_TRUE);
+}
+
+
+/*!
+ * \ingroup atmosphere
+ */
+Lib3dsBool
+lib3ds_atmosphere_write(Lib3dsAtmosphere *atmosphere, Lib3dsIo *io)
+{
+ if (atmosphere->fog.use) { /*---- LIB3DS_FOG ----*/
+ Lib3dsChunk c;
+ c.chunk=LIB3DS_FOG;
+ if (!lib3ds_chunk_write_start(&c,io)) {
+ return(LIB3DS_FALSE);
+ }
+ lib3ds_io_write_float(io, atmosphere->fog.near_plane);
+ lib3ds_io_write_float(io, atmosphere->fog.near_density);
+ lib3ds_io_write_float(io, atmosphere->fog.far_plane);
+ lib3ds_io_write_float(io, atmosphere->fog.far_density);
+ {
+ Lib3dsChunk c;
+ c.chunk=LIB3DS_COLOR_F;
+ c.size=18;
+ lib3ds_chunk_write(&c,io);
+ lib3ds_io_write_rgb(io, atmosphere->fog.col);
+ }
+ if (atmosphere->fog.fog_background) {
+ Lib3dsChunk c;
+ c.chunk=LIB3DS_FOG_BGND;
+ c.size=6;
+ lib3ds_chunk_write(&c,io);
+ }
+ if (!lib3ds_chunk_write_end(&c,io)) {
+ return(LIB3DS_FALSE);
+ }
+ }
+
+ if (atmosphere->layer_fog.use) { /*---- LIB3DS_LAYER_FOG ----*/
+ Lib3dsChunk c;
+ c.chunk=LIB3DS_LAYER_FOG;
+ c.size=40;
+ lib3ds_chunk_write(&c,io);
+ lib3ds_io_write_float(io, atmosphere->layer_fog.near_y);
+ lib3ds_io_write_float(io, atmosphere->layer_fog.far_y);
+ lib3ds_io_write_float(io, atmosphere->layer_fog.near_y);
+ lib3ds_io_write_dword(io, atmosphere->layer_fog.flags);
+ {
+ Lib3dsChunk c;
+ c.chunk=LIB3DS_COLOR_F;
+ c.size=18;
+ lib3ds_chunk_write(&c,io);
+ lib3ds_io_write_rgb(io, atmosphere->fog.col);
+ }
+ }
+
+ if (atmosphere->dist_cue.use) { /*---- LIB3DS_DISTANCE_CUE ----*/
+ Lib3dsChunk c;
+ c.chunk=LIB3DS_DISTANCE_CUE;
+ if (!lib3ds_chunk_write_start(&c,io)) {
+ return(LIB3DS_FALSE);
+ }
+ lib3ds_io_write_float(io, atmosphere->dist_cue.near_plane);
+ lib3ds_io_write_float(io, atmosphere->dist_cue.near_dimming);
+ lib3ds_io_write_float(io, atmosphere->dist_cue.far_plane);
+ lib3ds_io_write_float(io, atmosphere->dist_cue.far_dimming);
+ if (atmosphere->dist_cue.cue_background) {
+ Lib3dsChunk c;
+ c.chunk=LIB3DS_DCUE_BGND;
+ c.size=6;
+ lib3ds_chunk_write(&c,io);
+ }
+ if (!lib3ds_chunk_write_end(&c,io)) {
+ return(LIB3DS_FALSE);
+ }
+ }
+
+ if (atmosphere->fog.use) { /*---- LIB3DS_USE_FOG ----*/
+ Lib3dsChunk c;
+ c.chunk=LIB3DS_USE_FOG;
+ c.size=6;
+ lib3ds_chunk_write(&c,io);
+ }
+
+ if (atmosphere->layer_fog.use) { /*---- LIB3DS_USE_LAYER_FOG ----*/
+ Lib3dsChunk c;
+ c.chunk=LIB3DS_USE_LAYER_FOG;
+ c.size=6;
+ lib3ds_chunk_write(&c,io);
+ }
+
+ if (atmosphere->dist_cue.use) { /*---- LIB3DS_USE_DISTANCE_CUE ----*/
+ Lib3dsChunk c;
+ c.chunk=LIB3DS_USE_V_GRADIENT;
+ c.size=6;
+ lib3ds_chunk_write(&c,io);
+ }
+
+ return(LIB3DS_TRUE);
+}
+
+
+/*!
+
+\typedef Lib3dsAtmosphere
+ \ingroup atmosphere
+ \sa _Lib3dsAtmosphere
+
+*/
+
projects / summerhack / blobdiff