594 lines
16 KiB
C
594 lines
16 KiB
C
/* -----------------------------------------------------------------------------
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PicoModel Library
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Copyright (c) 2003, Randy Reddig & seaw0lf
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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Redistributions of source code must retain the above copyright notice, this list
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of conditions and the following disclaimer.
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Redistributions in binary form must reproduce the above copyright notice, this
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list of conditions and the following disclaimer in the documentation and/or
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other materials provided with the distribution.
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Neither the names of the copyright holders nor the names of its contributors may
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be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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----------------------------------------------------------------------------- */
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/* dependencies */
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#include "picointernal.h"
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typedef struct tga_s
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{
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unsigned char id_length, colormap_type, image_type;
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unsigned short colormap_index, colormap_length;
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unsigned char colormap_size;
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unsigned short x_origin, y_origin, width, height;
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unsigned char pixel_size, attributes;
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}
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tga_t;
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/*
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_terrain_load_tga_buffer()
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loads a tga image into a newly allocated image buffer
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fixme: replace/clean this function
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*/
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void _terrain_load_tga_buffer( unsigned char *buffer, unsigned char **pic, int *width, int *height ) {
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int row, column;
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int columns, rows, numPixels;
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unsigned char *pixbuf;
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unsigned char *buf_p;
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tga_t targa_header;
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unsigned char *targa_rgba;
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*pic = NULL;
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if ( buffer == NULL ) {
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return;
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}
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buf_p = buffer;
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targa_header.id_length = *buf_p++;
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targa_header.colormap_type = *buf_p++;
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targa_header.image_type = *buf_p++;
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targa_header.colormap_index = _pico_little_short( *(short*)buf_p );
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buf_p += 2;
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targa_header.colormap_length = _pico_little_short( *(short*) buf_p );
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buf_p += 2;
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targa_header.colormap_size = *buf_p++;
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targa_header.x_origin = _pico_little_short( *(short*) buf_p );
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buf_p += 2;
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targa_header.y_origin = _pico_little_short( *(short*) buf_p );
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buf_p += 2;
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targa_header.width = _pico_little_short( *(short*) buf_p );
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buf_p += 2;
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targa_header.height = _pico_little_short( *(short*) buf_p );
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buf_p += 2;
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targa_header.pixel_size = *buf_p++;
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targa_header.attributes = *buf_p++;
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if ( targa_header.image_type != 2 && targa_header.image_type != 10 && targa_header.image_type != 3 ) {
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_pico_printf( PICO_ERROR, "Only type 2 (RGB), 3 (gray), and 10 (RGB) TGA images supported\n" );
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pic = NULL;
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return;
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}
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if ( targa_header.colormap_type != 0 ) {
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_pico_printf( PICO_ERROR, "Indexed color TGA images not supported\n" );
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return;
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}
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if ( targa_header.pixel_size != 32 && targa_header.pixel_size != 24 && targa_header.image_type != 3 ) {
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_pico_printf( PICO_ERROR, "Only 32 or 24 bit TGA images supported (not indexed color)\n" );
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pic = NULL;
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return;
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}
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columns = targa_header.width;
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rows = targa_header.height;
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numPixels = columns * rows;
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if ( width ) {
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*width = columns;
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}
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if ( height ) {
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*height = rows;
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}
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targa_rgba = _pico_alloc( numPixels * 4 );
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*pic = targa_rgba;
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if ( targa_header.id_length != 0 ) {
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buf_p += targa_header.id_length; // skip TARGA image comment
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}
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if ( targa_header.image_type == 2 || targa_header.image_type == 3 ) {
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// Uncompressed RGB or gray scale image
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for ( row = rows - 1; row >= 0; row-- )
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{
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pixbuf = targa_rgba + row * columns * 4;
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for ( column = 0; column < columns; column++ )
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{
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unsigned char red,green,blue,alphabyte;
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switch ( targa_header.pixel_size )
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{
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case 8:
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blue = *buf_p++;
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green = blue;
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red = blue;
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*pixbuf++ = red;
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*pixbuf++ = green;
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*pixbuf++ = blue;
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*pixbuf++ = 255;
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break;
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case 24:
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blue = *buf_p++;
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green = *buf_p++;
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red = *buf_p++;
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*pixbuf++ = red;
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*pixbuf++ = green;
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*pixbuf++ = blue;
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*pixbuf++ = 255;
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break;
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case 32:
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blue = *buf_p++;
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green = *buf_p++;
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red = *buf_p++;
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alphabyte = *buf_p++;
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*pixbuf++ = red;
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*pixbuf++ = green;
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*pixbuf++ = blue;
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*pixbuf++ = alphabyte;
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break;
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default:
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break;
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}
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}
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}
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}
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/* rle encoded pixels */
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else if ( targa_header.image_type == 10 ) {
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unsigned char red,green,blue,alphabyte,packetHeader,packetSize,j;
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red = 0;
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green = 0;
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blue = 0;
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alphabyte = 0xff;
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for ( row = rows - 1; row >= 0; row-- ) {
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pixbuf = targa_rgba + row * columns * 4;
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for ( column = 0; column < columns; ) {
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packetHeader = *buf_p++;
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packetSize = 1 + ( packetHeader & 0x7f );
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if ( packetHeader & 0x80 ) { // run-length packet
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switch ( targa_header.pixel_size ) {
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case 24:
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blue = *buf_p++;
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green = *buf_p++;
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red = *buf_p++;
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alphabyte = 255;
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break;
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case 32:
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blue = *buf_p++;
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green = *buf_p++;
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red = *buf_p++;
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alphabyte = *buf_p++;
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break;
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default:
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//Error("LoadTGA: illegal pixel_size '%d' in file '%s'\n", targa_header.pixel_size, name );
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break;
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}
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for ( j = 0; j < packetSize; j++ ) {
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*pixbuf++ = red;
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*pixbuf++ = green;
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*pixbuf++ = blue;
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*pixbuf++ = alphabyte;
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column++;
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if ( column == columns ) { // run spans across rows
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column = 0;
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if ( row > 0 ) {
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row--;
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}
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else{
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goto breakOut;
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}
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pixbuf = targa_rgba + row * columns * 4;
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}
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}
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}
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else { // non run-length packet
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for ( j = 0; j < packetSize; j++ ) {
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switch ( targa_header.pixel_size ) {
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case 24:
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blue = *buf_p++;
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green = *buf_p++;
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red = *buf_p++;
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*pixbuf++ = red;
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*pixbuf++ = green;
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*pixbuf++ = blue;
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*pixbuf++ = 255;
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break;
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case 32:
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blue = *buf_p++;
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green = *buf_p++;
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red = *buf_p++;
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alphabyte = *buf_p++;
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*pixbuf++ = red;
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*pixbuf++ = green;
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*pixbuf++ = blue;
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*pixbuf++ = alphabyte;
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break;
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default:
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//Sysprintf("LoadTGA: illegal pixel_size '%d' in file '%s'\n", targa_header.pixel_size, name );
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break;
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}
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column++;
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if ( column == columns ) { // pixel packet run spans across rows
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column = 0;
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if ( row > 0 ) {
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row--;
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}
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else{
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goto breakOut;
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}
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pixbuf = targa_rgba + row * columns * 4;
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}
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}
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}
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}
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breakOut:;
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}
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}
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/* fix vertically flipped image */
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if ( ( targa_header.attributes & ( 1 << 5 ) ) ) {
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int flip;
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for ( row = 0; row < .5f * rows; row++ )
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{
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for ( column = 0; column < columns; column++ )
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{
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flip = *( (int*)targa_rgba + row * columns + column );
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*( (int*)targa_rgba + row * columns + column ) = *( (int*)targa_rgba + ( ( rows - 1 ) - row ) * columns + column );
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*( (int*)targa_rgba + ( ( rows - 1 ) - row ) * columns + column ) = flip;
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}
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}
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}
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}
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/*
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_terrain_canload()
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validates a picoterrain file
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*/
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static int _terrain_canload( PM_PARAMS_CANLOAD ) {
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picoParser_t *p;
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/* create pico parser */
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p = _pico_new_parser( (const picoByte_t*) buffer, bufSize );
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if ( p == NULL ) {
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return PICO_PMV_ERROR_MEMORY;
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}
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/* get first token */
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if ( _pico_parse_first( p ) == NULL ) {
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return PICO_PMV_ERROR_IDENT;
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}
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/* check first token */
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if ( _pico_stricmp( p->token, "picoterrain" ) ) {
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_pico_free_parser( p );
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return PICO_PMV_ERROR_IDENT;
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}
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/* free the pico parser object */
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_pico_free_parser( p );
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/* file seems to be a valid picoterrain file */
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return PICO_PMV_OK;
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}
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/*
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_terrain_load()
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loads a picoterrain file
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*/
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static picoModel_t *_terrain_load( PM_PARAMS_LOAD ) {
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int i, j, v, pw[ 5 ], r;
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picoParser_t *p;
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char *shader, *heightmapFile, *colormapFile;
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picoVec3_t scale, origin;
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unsigned char *imageBuffer;
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int imageBufSize, w, h, cw, ch;
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unsigned char *heightmap, *colormap, *heightPixel, *colorPixel;
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picoModel_t *picoModel;
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picoSurface_t *picoSurface;
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picoShader_t *picoShader;
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picoVec3_t xyz, normal;
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picoVec2_t st;
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picoColor_t color;
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/* create pico parser */
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p = _pico_new_parser( (const picoByte_t*) buffer, bufSize );
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if ( p == NULL ) {
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return NULL;
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}
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/* get first token */
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if ( _pico_parse_first( p ) == NULL ) {
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return NULL;
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}
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/* check first token */
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if ( _pico_stricmp( p->token, "picoterrain" ) ) {
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_pico_printf( PICO_ERROR, "Invalid PicoTerrain model" );
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_pico_free_parser( p );
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return NULL;
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}
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/* setup */
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shader = heightmapFile = colormapFile = NULL;
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_pico_set_vec( scale, 512, 512, 32 );
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/* parse ase model file */
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while ( 1 )
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{
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/* get first token on line */
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if ( !_pico_parse_first( p ) ) {
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break;
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}
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/* skip empty lines */
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if ( !p->token || !p->token[ 0 ] ) {
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continue;
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}
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/* shader */
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if ( !_pico_stricmp( p->token, "shader" ) ) {
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if ( _pico_parse( p, 0 ) && p->token[ 0 ] ) {
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if ( shader != NULL ) {
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_pico_free( shader );
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}
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shader = _pico_clone_alloc( p->token );
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}
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}
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/* heightmap */
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else if ( !_pico_stricmp( p->token, "heightmap" ) ) {
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if ( _pico_parse( p, 0 ) && p->token[ 0 ] ) {
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if ( heightmapFile != NULL ) {
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_pico_free( heightmapFile );
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}
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heightmapFile = _pico_clone_alloc( p->token );
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}
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}
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/* colormap */
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else if ( !_pico_stricmp( p->token, "colormap" ) ) {
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if ( _pico_parse( p, 0 ) && p->token[ 0 ] ) {
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if ( colormapFile != NULL ) {
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_pico_free( colormapFile );
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}
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colormapFile = _pico_clone_alloc( p->token );
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}
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}
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/* scale */
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else if ( !_pico_stricmp( p->token, "scale" ) ) {
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_pico_parse_vec( p, scale );
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}
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/* skip unparsed rest of line and continue */
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_pico_parse_skip_rest( p );
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}
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/* ----------------------------------------------------------------- */
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/* load heightmap */
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heightmap = imageBuffer = NULL;
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_pico_load_file( heightmapFile, &imageBuffer, &imageBufSize );
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_terrain_load_tga_buffer( imageBuffer, &heightmap, &w, &h );
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_pico_free( heightmapFile );
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_pico_free_file( imageBuffer );
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if ( heightmap == NULL || w < 2 || h < 2 ) {
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_pico_printf( PICO_ERROR, "PicoTerrain model with invalid heightmap" );
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if ( shader != NULL ) {
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_pico_free( shader );
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}
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if ( colormapFile != NULL ) {
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_pico_free( colormapFile );
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}
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_pico_free_parser( p );
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return NULL;
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}
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/* set origin (bottom lowest corner of terrain mesh) */
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_pico_set_vec( origin, ( w / -2 ) * scale[ 0 ], ( h / -2 ) * scale[ 1 ], -128 * scale[ 2 ] );
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/* load colormap */
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colormap = imageBuffer = NULL;
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_pico_load_file( colormapFile, &imageBuffer, &imageBufSize );
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_terrain_load_tga_buffer( imageBuffer, &colormap, &cw, &ch );
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_pico_free( colormapFile );
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_pico_free_file( imageBuffer );
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if ( cw != w || ch != h ) {
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_pico_printf( PICO_WARNING, "PicoTerrain colormap/heightmap size mismatch" );
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_pico_free( colormap );
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colormap = NULL;
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}
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/* ----------------------------------------------------------------- */
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/* create new pico model */
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picoModel = PicoNewModel();
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if ( picoModel == NULL ) {
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_pico_printf( PICO_ERROR, "Unable to allocate a new model" );
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return NULL;
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}
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/* do model setup */
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PicoSetModelFrameNum( picoModel, frameNum );
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PicoSetModelNumFrames( picoModel, 1 ); /* sea */
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PicoSetModelName( picoModel, fileName );
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PicoSetModelFileName( picoModel, fileName );
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/* allocate new pico surface */
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picoSurface = PicoNewSurface( picoModel );
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if ( picoSurface == NULL ) {
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_pico_printf( PICO_ERROR, "Unable to allocate a new model surface" );
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PicoFreeModel( picoModel ); /* sea */
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return NULL;
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}
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/* terrain surfaces are triangle meshes */
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PicoSetSurfaceType( picoSurface, PICO_TRIANGLES );
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/* set surface name */
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PicoSetSurfaceName( picoSurface, "picoterrain" );
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/* create new pico shader */
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picoShader = PicoNewShader( picoModel );
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if ( picoShader == NULL ) {
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_pico_printf( PICO_ERROR, "Unable to allocate a new model shader" );
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PicoFreeModel( picoModel );
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_pico_free( shader );
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return NULL;
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}
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/* detox and set shader name */
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_pico_setfext( shader, "" );
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_pico_unixify( shader );
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PicoSetShaderName( picoShader, shader );
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_pico_free( shader );
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/* associate current surface with newly created shader */
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PicoSetSurfaceShader( picoSurface, picoShader );
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/* make bogus normal */
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_pico_set_vec( normal, 0.0f, 0.0f, 0.0f );
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/* create mesh */
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for ( j = 0; j < h; j++ )
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{
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for ( i = 0; i < w; i++ )
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{
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/* get pointers */
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v = i + ( j * w );
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heightPixel = heightmap + v * 4;
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colorPixel = colormap
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? colormap + v * 4
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: NULL;
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/* set xyz */
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_pico_set_vec( xyz, origin[ 0 ] + scale[ 0 ] * i,
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origin[ 1 ] + scale[ 1 ] * j,
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origin[ 2 ] + scale[ 2 ] * heightPixel[ 0 ] );
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PicoSetSurfaceXYZ( picoSurface, v, xyz );
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/* set normal */
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PicoSetSurfaceNormal( picoSurface, v, normal );
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/* set st */
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st[ 0 ] = (float) i;
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st[ 1 ] = (float) j;
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PicoSetSurfaceST( picoSurface, 0, v, st );
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/* set color */
|
|
if ( colorPixel != NULL ) {
|
|
_pico_set_color( color, colorPixel[ 0 ], colorPixel[ 1 ], colorPixel[ 2 ], colorPixel[ 3 ] );
|
|
}
|
|
else{
|
|
_pico_set_color( color, 255, 255, 255, 255 );
|
|
}
|
|
PicoSetSurfaceColor( picoSurface, 0, v, color );
|
|
|
|
/* set triangles (zero alpha in heightmap suppresses this quad) */
|
|
if ( i < ( w - 1 ) && j < ( h - 1 ) && heightPixel[ 3 ] >= 128 ) {
|
|
/* set indexes */
|
|
pw[ 0 ] = i + ( j * w );
|
|
pw[ 1 ] = i + ( ( j + 1 ) * w );
|
|
pw[ 2 ] = i + 1 + ( ( j + 1 ) * w );
|
|
pw[ 3 ] = i + 1 + ( j * w );
|
|
pw[ 4 ] = i + ( j * w ); /* same as pw[ 0 ] */
|
|
|
|
/* set radix */
|
|
r = ( i + j ) & 1;
|
|
|
|
/* make first triangle */
|
|
PicoSetSurfaceIndex( picoSurface, ( v * 6 + 0 ), (picoIndex_t) pw[ r + 0 ] );
|
|
PicoSetSurfaceIndex( picoSurface, ( v * 6 + 1 ), (picoIndex_t) pw[ r + 1 ] );
|
|
PicoSetSurfaceIndex( picoSurface, ( v * 6 + 2 ), (picoIndex_t) pw[ r + 2 ] );
|
|
|
|
/* make second triangle */
|
|
PicoSetSurfaceIndex( picoSurface, ( v * 6 + 3 ), (picoIndex_t) pw[ r + 0 ] );
|
|
PicoSetSurfaceIndex( picoSurface, ( v * 6 + 4 ), (picoIndex_t) pw[ r + 2 ] );
|
|
PicoSetSurfaceIndex( picoSurface, ( v * 6 + 5 ), (picoIndex_t) pw[ r + 3 ] );
|
|
}
|
|
}
|
|
}
|
|
|
|
/* free stuff */
|
|
_pico_free_parser( p );
|
|
_pico_free( heightmap );
|
|
_pico_free( colormap );
|
|
|
|
/* return the new pico model */
|
|
return picoModel;
|
|
}
|
|
|
|
|
|
|
|
/* pico file format module definition */
|
|
const picoModule_t picoModuleTerrain =
|
|
{
|
|
"1.3", /* module version string */
|
|
"PicoTerrain", /* module display name */
|
|
"Randy Reddig", /* author's name */
|
|
"2003 Randy Reddig", /* module copyright */
|
|
{
|
|
"picoterrain", NULL, NULL, NULL /* default extensions to use */
|
|
},
|
|
_terrain_canload, /* validation routine */
|
|
_terrain_load, /* load routine */
|
|
NULL, /* save validation routine */
|
|
NULL /* save routine */
|
|
};
|