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#include "../util/typedef.h"
#include "../util/string.h"
#include "../util/vector.h"
#include "../util/file.h"
#include <assert.h>
struct MODEL {
};
namespace OBJ {
enum LINE_TYPES : U16 {
comment = ( '#' | ( ' ' << 8 ) ),
f = ( 'f' | ( ' ' << 8 ) ),
mtllib = ( 'm' | ( 't' << 8 ) ),
o = ( 'o' | ( ' ' << 8 ) ),
s = ( 's' | ( ' ' << 8 ) ),
v = ( 'v' | ( ' ' << 8 ) ),
vn = ( 'v' | ( 'n' << 8 ) ),
vt = ( 'v' | ( 't' << 8 ) ),
usemtl = ( 'u' | ( 's' << 8 ) )
};
enum FACE_TYPES : U8 {
V = 0,
VVT = 1,
VVN = 2,
VVTVN = 3
};
static inline U32 face_stride( FACE_TYPES t ) {
switch( t ) {
case FACE_TYPES::V: return 1;
case FACE_TYPES::VVT: return 2;
case FACE_TYPES::VVN: return 2;
case FACE_TYPES::VVTVN: return 3;
}
return 0;
}
constexpr U32 STR_LEN = 0x40;
static inline char* skip_space( char* s ) {
while( *s == ' ' || *s == '\t' ) ++s;
return s;
}
static inline char* read_f32( char* s, F32* out ) {
*out = strtof( s, &s );
return s;
}
static inline char* read_u32( char* s, U32* out ) {
*out = strtoul( s, &s, 10 );
return s;
}
struct MTLDATA {
STR name;
};
struct OBJDATA {
LIST<VEC2> uvs;
LIST<VEC3> normals;
LIST<VEC3> vertices;
LIST<MTLDATA> mtllib;
struct UseMtl {
LIST<U32> indices;
LIST<STR> data;
} usemtl;
struct Indices {
LIST<U32> data;
LIST<U32> counts;
LIST<FACE_TYPES> types;
} indices;
};
inline OBJDATA obj_from_file( const char* path, const char* name ) {
char* f_obj = nullptr;
STR obj_path( path );
U64 obj_size = 0;
obj_path += name;
obj_path += ".obj";
f_obj = (char*)file_read( obj_path.data, &obj_size );
if( !f_obj ) {
dlog( "obj_from_file() : failed to read obj file %s\n", obj_path.data );
return {};
}
dlog( "___modelfile___\n%s\n", f_obj );
OBJDATA obj;
for( U64 i = 0; i < obj_size - 1 && f_obj[i]; ++i ) {
if( f_obj[i] == (I32)'#' ) {
while( f_obj[i] && f_obj[i] != '\n' ) ++i;
continue;
}
I32 c0 = f_obj[i];
U16 c1 = f_obj[i + 1];
I32 first_two = c0 | c1 << 8;
switch( first_two ) {
case LINE_TYPES::f: {
FACE_TYPES type = FACE_TYPES::V;
char* s = f_obj + i + 2;
bool type_set = 0;
U32 count = 0;
s = skip_space( s );
while( *s && *s != '\n' ) {
bool has_vt = 0, has_vn = 0;
U32 v = 0, vt = 0, vn = 0;
s = read_u32( s, &v );
obj.indices.data.push( --v );
if( *s == '/' ) {
++s;
if( *s != '/' ) {
s = read_u32( s, &vt );
obj.indices.data.push( --vt );
has_vt = 1;
}
if( *s == '/' ) {
s = read_u32( ++s, &vn );
obj.indices.data.push( --vn );
has_vn = 1;
}
}
if( !type_set ) {
if( has_vt && has_vn )
type = FACE_TYPES::VVTVN;
else if( has_vt )
type = FACE_TYPES::VVT;
else if( has_vn )
type = FACE_TYPES::VVN;
else
type = FACE_TYPES::V;
type_set = 1;
}
++count;
while( *s && *s != ' ' && *s != '\n' )
++s;
s = skip_space( s );
}
obj.indices.counts.push( count );
obj.indices.types.push( type );
} break;
case LINE_TYPES::v:
case LINE_TYPES::vn: {
bool is_v = first_two == LINE_TYPES::v;
U32 start = i + ( is_v ? 2 : 3 );
char* s = f_obj + start;
VEC3 temp{};
s = skip_space( s );
s = read_f32( s, &temp.x );
s = skip_space( s );
s = read_f32( s, &temp.y );
s = skip_space( s );
s = read_f32( s, &temp.z );
if( is_v )
obj.vertices.push( temp );
else
obj.normals.push( temp );
} break;
case LINE_TYPES::vt: {
char* s = f_obj + i + 3;
VEC2 temp{};
s = skip_space( s );
s = read_f32( s, &temp.x );
s = skip_space( s );
s = read_f32( s, &temp.y );
obj.uvs.push( temp );
} break;
case LINE_TYPES::mtllib:
case LINE_TYPES::usemtl: {
bool is_mtllib = first_two == LINE_TYPES::mtllib;
char* start = f_obj + i + 7;
char* end = start;
while( *end && *end != '\n' ) ++end;
U32 len = end - start;
STR temp;
temp.reserve( len + 1 );
memcpy( temp, start, len );
temp.data[len] = 0;
if( !is_mtllib ) {
obj.usemtl.data.push( temp );
obj.usemtl.indices.push( obj.indices.data.size );
}
else {
U64 mtl_size = 0;
STR mtl_path( path );
mtl_path += temp.data;
char* f_mtl = (char*)file_read( mtl_path.data, &mtl_size );
if( !f_mtl ) {
dlog( "obj_from_file() : failed to read mtl file %s\n", mtl_path.data );
return {};
}
dlog( "___mtlfile___\n%s\n", f_mtl );
// TODO: finish mtl parsing here into obj.mtllib
obj.mtllib.push({ temp });
free( (void*)f_mtl );
}
} break;
case LINE_TYPES::comment:
case LINE_TYPES::o:
case LINE_TYPES::s: break;
default: dlog( "unhandled char combo %c%c\n", c0, c1 ); break;
}
while( f_obj[i] && f_obj[i] != '\n' ) ++i;
}
free( (void*)f_obj );
return obj;
}
inline MODEL obj_to_model( OBJDATA obj ) {
MODEL model;
return model;
}
};
inline MODEL model_from_obj( const I8* path, const I8* name ) {
OBJ::OBJDATA obj = OBJ::obj_from_file( path, name );
return OBJ::obj_to_model( obj );
}
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