picoVertexCombinationHash_t *PicoAddVertexCombinationToHashTable (picoVertexCombinationHash_t **hashTable,
picoVec3_t xyz, picoVec3_t normal, picoVec3_t st, picoColor_t color, picoIndex_t index)
{
unsigned int hash;
picoVertexCombinationHash_t *vertexCombinationHash;
/* dumy check */
if (hashTable == NULL || xyz == NULL || normal == NULL || st == NULL || color == NULL)
return NULL;
vertexCombinationHash = _pico_alloc(sizeof(picoVertexCombinationHash_t));
if (!vertexCombinationHash)
return NULL;
hash = PicoVertexCoordGenerateHash(xyz);
_pico_copy_vec(xyz, vertexCombinationHash->vcd.xyz);
_pico_copy_vec(normal, vertexCombinationHash->vcd.normal);
_pico_copy_vec2(st, vertexCombinationHash->vcd.st);
_pico_copy_color(color, vertexCombinationHash->vcd.color);
vertexCombinationHash->index = index;
vertexCombinationHash->data = NULL;
vertexCombinationHash->next = hashTable[hash];
hashTable[hash] = vertexCombinationHash;
return vertexCombinationHash;
}
static picoModel_t *_terrain_load( PM_PARAMS_LOAD ){
int i, j, v, pw[ 5 ], r;
picoParser_t *p;
char *shader, *heightmapFile, *colormapFile;
picoVec3_t scale, origin;
unsigned char *imageBuffer;
int imageBufSize, w, h, cw, ch;
unsigned char *heightmap, *colormap, *heightPixel, *colorPixel;
picoModel_t *picoModel;
picoSurface_t *picoSurface;
picoShader_t *picoShader;
picoVec3_t xyz, normal;
picoVec2_t st;
picoColor_t color;
/* create pico parser */
p = _pico_new_parser( (const picoByte_t*) buffer, bufSize );
if ( p == NULL ) {
return NULL;
}
/* get first token */
if ( _pico_parse_first( p ) == NULL ) {
return NULL;
}
/* check first token */
if ( _pico_stricmp( p->token, "picoterrain" ) ) {
_pico_printf( PICO_ERROR, "Invalid PicoTerrain model" );
_pico_free_parser( p );
return NULL;
}
/* setup */
shader = heightmapFile = colormapFile = NULL;
_pico_set_vec( scale, 512, 512, 32 );
/* parse ase model file */
while ( 1 )
{
/* get first token on line */
if ( !_pico_parse_first( p ) ) {
break;
}
/* skip empty lines */
if ( !p->token || !p->token[ 0 ] ) {
continue;
}
/* shader */
if ( !_pico_stricmp( p->token, "shader" ) ) {
if ( _pico_parse( p, 0 ) && p->token[ 0 ] ) {
if ( shader != NULL ) {
_pico_free( shader );
}
shader = _pico_clone_alloc( p->token );
}
}
/* heightmap */
else if ( !_pico_stricmp( p->token, "heightmap" ) ) {
if ( _pico_parse( p, 0 ) && p->token[ 0 ] ) {
if ( heightmapFile != NULL ) {
_pico_free( heightmapFile );
}
heightmapFile = _pico_clone_alloc( p->token );
}
}
/* colormap */
else if ( !_pico_stricmp( p->token, "colormap" ) ) {
if ( _pico_parse( p, 0 ) && p->token[ 0 ] ) {
if ( colormapFile != NULL ) {
_pico_free( colormapFile );
}
colormapFile = _pico_clone_alloc( p->token );
}
}
/* scale */
else if ( !_pico_stricmp( p->token, "scale" ) ) {
_pico_parse_vec( p, scale );
}
/* skip unparsed rest of line and continue */
_pico_parse_skip_rest( p );
}
/* ----------------------------------------------------------------- */
/* load heightmap */
heightmap = imageBuffer = NULL;
_pico_load_file( heightmapFile, &imageBuffer, &imageBufSize );
_terrain_load_tga_buffer( imageBuffer, &heightmap, &w, &h );
_pico_free( heightmapFile );
_pico_free_file( imageBuffer );
if ( heightmap == NULL || w < 2 || h < 2 ) {
_pico_printf( PICO_ERROR, "PicoTerrain model with invalid heightmap" );
if ( shader != NULL ) {
_pico_free( shader );
}
if ( colormapFile != NULL ) {
_pico_free( colormapFile );
}
_pico_free_parser( p );
return NULL;
}
/* set origin (bottom lowest corner of terrain mesh) */
_pico_set_vec( origin, ( w / -2 ) * scale[ 0 ], ( h / -2 ) * scale[ 1 ], -128 * scale[ 2 ] );
/* load colormap */
colormap = imageBuffer = NULL;
_pico_load_file( colormapFile, &imageBuffer, &imageBufSize );
_terrain_load_tga_buffer( imageBuffer, &colormap, &cw, &ch );
_pico_free( colormapFile );
_pico_free_file( imageBuffer );
if ( cw != w || ch != h ) {
_pico_printf( PICO_WARNING, "PicoTerrain colormap/heightmap size mismatch" );
_pico_free( colormap );
colormap = NULL;
}
/* ----------------------------------------------------------------- */
/* create new pico model */
picoModel = PicoNewModel();
if ( picoModel == NULL ) {
_pico_printf( PICO_ERROR, "Unable to allocate a new model" );
return NULL;
}
/* do model setup */
PicoSetModelFrameNum( picoModel, frameNum );
PicoSetModelNumFrames( picoModel, 1 ); /* sea */
PicoSetModelName( picoModel, fileName );
PicoSetModelFileName( picoModel, fileName );
/* allocate new pico surface */
picoSurface = PicoNewSurface( picoModel );
if ( picoSurface == NULL ) {
_pico_printf( PICO_ERROR, "Unable to allocate a new model surface" );
PicoFreeModel( picoModel ); /* sea */
return NULL;
}
/* terrain surfaces are triangle meshes */
PicoSetSurfaceType( picoSurface, PICO_TRIANGLES );
/* set surface name */
PicoSetSurfaceName( picoSurface, "picoterrain" );
/* create new pico shader */
picoShader = PicoNewShader( picoModel );
if ( picoShader == NULL ) {
_pico_printf( PICO_ERROR, "Unable to allocate a new model shader" );
PicoFreeModel( picoModel );
_pico_free( shader );
return NULL;
}
/* detox and set shader name */
_pico_setfext( shader, NULL );
_pico_unixify( shader );
PicoSetShaderName( picoShader, shader );
_pico_free( shader );
/* associate current surface with newly created shader */
PicoSetSurfaceShader( picoSurface, picoShader );
/* make bogus normal */
_pico_set_vec( normal, 0.0f, 0.0f, 0.0f );
/* create mesh */
for ( j = 0; j < h; j++ )
{
for ( i = 0; i < w; i++ )
{
/* get pointers */
v = i + ( j * w );
heightPixel = heightmap + v * 4;
colorPixel = colormap
? colormap + v * 4
: NULL;
/* set xyz */
_pico_set_vec( xyz, origin[ 0 ] + scale[ 0 ] * i,
origin[ 1 ] + scale[ 1 ] * j,
origin[ 2 ] + scale[ 2 ] * heightPixel[ 0 ] );
PicoSetSurfaceXYZ( picoSurface, v, xyz );
/* set normal */
PicoSetSurfaceNormal( picoSurface, v, normal );
/* set st */
st[ 0 ] = (float) i;
st[ 1 ] = (float) j;
PicoSetSurfaceST( picoSurface, 0, v, st );
/* set color */
if ( colorPixel != NULL ) {
_pico_set_color( color, colorPixel[ 0 ], colorPixel[ 1 ], colorPixel[ 2 ], colorPixel[ 3 ] );
}
else{
_pico_copy_color( picoColor_white, color );
}
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;
}
