8 typedef struct scene scene
;
12 mdl_vert
*arrvertices
;
15 u32 vertex_count
, indice_count
,
16 max_vertices
, max_indices
;
22 /* Initialize a scene description with bounded buffers */
23 VG_STATIC scene
*scene_init( void *lin_alloc
, u32 max_verts
, u32 max_indices
)
25 u32 vertex_length
= max_verts
* sizeof(mdl_vert
),
26 index_length
= max_indices
* sizeof(u32
),
27 tot_size
= sizeof(scene
) + vertex_length
+ index_length
;
29 scene
*pscene
= vg_linear_alloc( lin_alloc
, tot_size
);
31 pscene
->arrvertices
= (mdl_vert
*)(pscene
+1);
32 pscene
->arrindices
= (u32
*)( pscene
->arrvertices
+ max_verts
);
34 pscene
->vertex_count
= 0;
35 pscene
->indice_count
= 0;
36 pscene
->max_vertices
= max_verts
;
37 pscene
->max_indices
= max_indices
;
39 memset( &pscene
->submesh
, 0, sizeof(mdl_submesh
) );
41 v3_fill( pscene
->bbx
[0], 999999.9f
);
42 v3_fill( pscene
->bbx
[1], -999999.9f
);
48 * Append a model into the scene with a given transform
50 VG_STATIC
void scene_add_submesh( scene
*pscene
, mdl_context
*mdl
,
51 mdl_submesh
*sm
, m4x3f transform
)
53 if( pscene
->vertex_count
+ sm
->vertex_count
> pscene
->max_vertices
)
55 vg_error( "%u(current) + %u > %u\n", pscene
->vertex_count
,
57 pscene
->max_vertices
);
59 vg_warn( "%p ... %p\n", pscene
, sm
);
60 vg_fatal_exit_loop( "Scene vertex buffer overflow" );
63 if( pscene
->indice_count
+ sm
->indice_count
> pscene
->max_indices
)
65 vg_error( "%u(current) + %u > %u\n", pscene
->indice_count
,
67 pscene
->max_indices
);
68 vg_warn( "%p ... %p\n", pscene
, sm
);
70 vg_fatal_exit_loop( "Scene index buffer overflow" );
73 mdl_vert
*src_verts
= mdl_submesh_vertices( mdl
, sm
),
74 *dst_verts
= &pscene
->arrvertices
[ pscene
->vertex_count
];
76 u32
*src_indices
= mdl_submesh_indices( mdl
, sm
),
77 *dst_indices
= &pscene
->arrindices
[ pscene
->indice_count
];
79 /* Transform and place vertices */
81 box_copy( sm
->bbx
, bbxnew
);
82 m4x3_transform_aabb( transform
, bbxnew
);
83 box_concat( pscene
->bbx
, bbxnew
);
86 m3x3_copy( transform
, normal_matrix
);
87 v3_normalize( normal_matrix
[0] );
88 v3_normalize( normal_matrix
[1] );
89 v3_normalize( normal_matrix
[2] );
91 for( u32 i
=0; i
<sm
->vertex_count
; i
++ )
93 mdl_vert
*pvert
= &dst_verts
[ i
],
94 *src
= &src_verts
[ i
];
96 m4x3_mulv( transform
, src
->co
, pvert
->co
);
97 m3x3_mulv( normal_matrix
, src
->norm
, pvert
->norm
);
99 pvert
->colour
[0] = src
->colour
[0];
100 pvert
->colour
[1] = src
->colour
[1];
101 pvert
->colour
[2] = src
->colour
[2];
102 pvert
->colour
[3] = src
->colour
[3];
103 v2_copy( src
->uv
, pvert
->uv
);
106 for( u32 i
=0; i
<sm
->indice_count
; i
++ )
108 dst_indices
[i
] = src_indices
[i
] + pscene
->vertex_count
;
111 pscene
->vertex_count
+= sm
->vertex_count
;
112 pscene
->indice_count
+= sm
->indice_count
;
117 * One by one adders for simplified access (mostly procedural stuff)
119 VG_STATIC
void scene_push_tri( scene
*pscene
, u32 tri
[3] )
121 if( pscene
->indice_count
+ 3 > pscene
->max_indices
)
122 vg_fatal_exit_loop( "Scene vertex buffer overflow" );
124 u32
*dst
= &pscene
->arrindices
[ pscene
->indice_count
];
130 pscene
->indice_count
+= 3;
133 VG_STATIC
void scene_push_vert( scene
*pscene
, mdl_vert
*v
)
135 if( pscene
->vertex_count
+ 1 > pscene
->max_vertices
)
136 vg_fatal_exit_loop( "Scene vertex buffer overflow" );
138 mdl_vert
*dst
= &pscene
->arrvertices
[ pscene
->vertex_count
];
141 pscene
->vertex_count
++;
144 VG_STATIC
void scene_copy_slice( scene
*pscene
, mdl_submesh
*sm
)
146 sm
->indice_start
= pscene
->submesh
.indice_start
;
147 sm
->indice_count
= pscene
->indice_count
- sm
->indice_start
;
149 sm
->vertex_start
= pscene
->submesh
.vertex_start
;
150 sm
->vertex_count
= pscene
->vertex_count
- sm
->vertex_start
;
152 pscene
->submesh
.indice_start
= pscene
->indice_count
;
153 pscene
->submesh
.vertex_start
= pscene
->vertex_count
;
156 /* finalization: tightly pack data */
157 __attribute__((warn_unused_result
))
158 VG_STATIC scene
*scene_fix( void *lin_alloc
, scene
*pscene
)
161 u32 vertex_count
= pscene
->vertex_count
,
162 indice_count
= pscene
->indice_count
,
163 vertex_length
= vertex_count
* sizeof(mdl_vert
),
164 index_length
= indice_count
* sizeof(u32
),
165 tot_size
= sizeof(scene
) + vertex_length
+ index_length
;
167 /* copy down index data */
168 void *dst_indices
= pscene
->arrvertices
+ vertex_length
;
169 memmove( dst_indices
, pscene
->arrindices
, index_length
);
172 pscene
= vg_linear_resize( lin_alloc
, pscene
, tot_size
);
174 pscene
->arrvertices
= (mdl_vert
*)(pscene
+1);
175 pscene
->arrindices
= (u32
*)(pscene
->arrvertices
+vertex_count
);
176 pscene
->max_vertices
= vertex_count
;
177 pscene
->max_indices
= indice_count
;
183 /* finalization: delete any offline buffers and reduce size */
184 __attribute__((warn_unused_result
))
185 VG_STATIC scene
*scene_free_offline_buffers( void *lin_alloc
, scene
*pscene
)
187 u32 tot_size
= sizeof(scene
);
189 scene
*src_scene
= pscene
;
190 mdl_vert
*src_verts
= pscene
->arrvertices
;
191 u32
*src_indices
= pscene
->arrindices
;
193 scene
*dst_scene
= vg_linear_resize( lin_alloc
, pscene
, tot_size
);
194 memcpy( dst_scene
, src_scene
, sizeof(scene
) );
196 dst_scene
->arrindices
= NULL
;
197 dst_scene
->arrvertices
= NULL
;
203 VG_STATIC
void scene_upload( scene
*pscene
, glmesh
*mesh
)
206 pscene
->arrvertices
, pscene
->vertex_count
,
207 pscene
->arrindices
, pscene
->indice_count
);
209 vg_info( "Scene upload\n" );
210 vg_info( " indices:%u\n", pscene
->indice_count
);
211 vg_info( " verts:%u\n", pscene
->vertex_count
);
218 VG_STATIC
void scene_bh_expand_bound( void *user
, boxf bound
, u32 item_index
)
221 mdl_vert
*pa
= &s
->arrvertices
[ s
->arrindices
[item_index
*3+0] ],
222 *pb
= &s
->arrvertices
[ s
->arrindices
[item_index
*3+1] ],
223 *pc
= &s
->arrvertices
[ s
->arrindices
[item_index
*3+2] ];
225 box_addpt( bound
, pa
->co
);
226 box_addpt( bound
, pb
->co
);
227 box_addpt( bound
, pc
->co
);
230 VG_STATIC
float scene_bh_centroid( void *user
, u32 item_index
, int axis
)
233 mdl_vert
*pa
= &s
->arrvertices
[ s
->arrindices
[item_index
*3+0] ],
234 *pb
= &s
->arrvertices
[ s
->arrindices
[item_index
*3+1] ],
235 *pc
= &s
->arrvertices
[ s
->arrindices
[item_index
*3+2] ];
237 return (pa
->co
[axis
] + pb
->co
[axis
] + pc
->co
[axis
]) * (1.0f
/3.0f
);
240 VG_STATIC
void scene_bh_swap( void *user
, u32 ia
, u32 ib
)
244 u32
*ti
= &s
->arrindices
[ia
*3];
245 u32
*tj
= &s
->arrindices
[ib
*3];
261 VG_STATIC
void scene_bh_debug( void *user
, u32 item_index
)
264 u32 idx
= item_index
*3;
265 mdl_vert
*pa
= &s
->arrvertices
[ s
->arrindices
[ idx
+0 ] ],
266 *pb
= &s
->arrvertices
[ s
->arrindices
[ idx
+1 ] ],
267 *pc
= &s
->arrvertices
[ s
->arrindices
[ idx
+2 ] ];
269 vg_line( pa
->co
, pb
->co
, 0xff0000ff );
270 vg_line( pb
->co
, pc
->co
, 0xff0000ff );
271 vg_line( pc
->co
, pa
->co
, 0xff0000ff );
274 VG_STATIC
int scene_bh_ray( void *user
, u32 index
, v3f co
,
275 v3f dir
, ray_hit
*hit
)
280 u32
*tri
= &s
->arrindices
[ index
*3 ];
282 for( int i
=0; i
<3; i
++ )
283 v3_copy( s
->arrvertices
[tri
[i
]].co
, positions
[i
] );
286 if(ray_tri( positions
, co
, dir
, &t
))
299 VG_STATIC bh_system bh_system_scene
=
301 .expand_bound
= scene_bh_expand_bound
,
302 .item_centroid
= scene_bh_centroid
,
303 .item_swap
= scene_bh_swap
,
304 .item_debug
= scene_bh_debug
,
305 .cast_ray
= scene_bh_ray
309 * An extra step is added onto the end to calculate the hit normal
311 VG_STATIC
int scene_raycast( scene
*s
, bh_tree
*bh
,
312 v3f co
, v3f dir
, ray_hit
*hit
)
314 int count
= bh_ray( bh
, co
, dir
, hit
);
320 float *pa
= s
->arrvertices
[hit
->tri
[0]].co
,
321 *pb
= s
->arrvertices
[hit
->tri
[1]].co
,
322 *pc
= s
->arrvertices
[hit
->tri
[2]].co
;
324 v3_sub( pa
, pb
, v0
);
325 v3_sub( pc
, pb
, v1
);
326 v3_cross( v1
, v0
, hit
->normal
);
327 v3_normalize( hit
->normal
);
328 v3_muladds( co
, dir
, hit
->dist
, hit
->pos
);
334 VG_STATIC bh_tree
*scene_bh_create( void *lin_alloc
, scene
*s
)
336 u32 triangle_count
= s
->indice_count
/ 3;
337 return bh_create( lin_alloc
, &bh_system_scene
, s
, triangle_count
);