1 /* Copyright (C) 2021-2022 Harry Godden (hgn) - All Rights Reserved */
11 #define VG__RED 0xff0000ff
12 #define VG__GREEN 0xff00ff00
13 #define VG__BLUE 0xffff0000
14 #define VG__WHITE 0xffffffff
15 #define VG__BLACK 0xff000000
16 #define VG__CLEAR 0x00ffffff
17 #define VG__PINK 0xffff00ff
18 #define VG__YELOW 0xff00ffff
19 #define VG__CYAN 0xffffff00
20 #define VG__NONE 0x00000000
22 static struct vg_shader _shader_lines
= {
30 "layout (location=0) in vec3 a_co;"
31 "layout (location=1) in vec4 a_colour;"
37 " vec4 vert_pos = uPv * vec4( a_co, 1.0 );"
38 " s_colour = a_colour;"
39 " gl_Position = vert_pos;"
52 " FragColor = s_colour;"
71 VG_STATIC
void async_vg_lines_init( void *payload
, u32 payload_size
)
73 glGenVertexArrays( 1, &vg_lines
.vao
);
74 glGenBuffers( 1, &vg_lines
.vbo
);
75 glBindVertexArray( vg_lines
.vao
);
76 glBindBuffer( GL_ARRAY_BUFFER
, vg_lines
.vbo
);
78 u32 size
= 50000 * sizeof( struct vg_lines_vert
);
80 vg_lines
.vertex_buffer
=
81 vg_create_linear_allocator(vg_mem
.rtmemory
, size
, VG_MEMORY_REALTIME
);
83 glBufferData( GL_ARRAY_BUFFER
, size
, NULL
, GL_DYNAMIC_DRAW
);
84 glBindVertexArray( vg_lines
.vao
);
88 glVertexAttribPointer(
93 sizeof( struct vg_lines_vert
),
96 glEnableVertexAttribArray( 0 );
98 glVertexAttribPointer(
103 sizeof( struct vg_lines_vert
),
104 (void*)(offsetof( struct vg_lines_vert
, colour
))
106 glEnableVertexAttribArray( 1 );
109 vg_success( "done\n" );
111 vg_lines
.allow_input
= 1;
114 VG_STATIC
void vg_lines_init(void)
116 vg_async_item
*call
= vg_async_alloc(0);
117 vg_async_dispatch( call
, async_vg_lines_init
);
119 vg_console_reg_var( "vg_lines", &vg_lines
.draw
, k_var_dtype_i32
,
121 vg_shader_register( &_shader_lines
);
125 VG_STATIC
void vg_lines_drawall( void )
127 glUseProgram( _shader_lines
.id
);
129 glUniformMatrix4fv( glGetUniformLocation( _shader_lines
.id
, "uPv" ),
130 1, GL_FALSE
, (float *)vg
.pv
);
132 glBindVertexArray( vg_lines
.vao
);
133 glBindBuffer( GL_ARRAY_BUFFER
, vg_lines
.vbo
);
135 u32 bufusage
= vg_linear_get_cur(vg_lines
.vertex_buffer
);
137 glBufferSubData( GL_ARRAY_BUFFER
, 0, bufusage
, vg_lines
.vertex_buffer
);
139 glEnable( GL_BLEND
);
140 glBlendFunc( GL_SRC_ALPHA
, GL_ONE_MINUS_SRC_ALPHA
);
141 glBlendEquation( GL_FUNC_ADD
);
144 glDrawArrays( GL_LINES
, 0, bufusage
/ sizeof(struct vg_lines_vert
) );
146 glDisable( GL_BLEND
);
147 vg_linear_clear( vg_lines
.vertex_buffer
);
150 VG_STATIC
void vg_line2( line_co from
, line_co to
, u32 fc
, u32 tc
)
152 if( !vg_lines
.allow_input
)
155 u32 size
= 2 * sizeof(struct vg_lines_vert
);
156 struct vg_lines_vert
*v
= vg_linear_alloc( vg_lines
.vertex_buffer
, size
);
158 v3_copy( from
, v
[0].co
);
159 v3_copy( to
, v
[1].co
);
165 VG_STATIC
void vg_line( line_co from
, line_co to
, u32 colour
)
167 vg_line2( from
, to
, colour
, colour
);
170 VG_STATIC
void line_tangent_basis( v3f n
, v3f tx
, v3f ty
)
172 /* Compute tangent basis (box2d) */
173 if( fabsf( n
[0] ) >= 0.57735027f
){
185 v3_cross( n
, tx
, ty
);
188 VG_STATIC
void vg_line_arrow( line_co co
, line_co dir
, float size
, u32 colour
)
190 v3f p1
, tx
, ty
, p2
, p3
;
191 v3_muladds( co
, dir
, size
, p1
);
192 line_tangent_basis( dir
, tx
, ty
);
194 v3_muladds( p1
, dir
, -size
* 0.125f
, p2
);
195 v3_muladds( p2
, ty
, size
* 0.125f
, p3
);
196 v3_muladds( p2
, ty
, -size
* 0.125f
, p2
);
198 vg_line( co
, p1
, colour
);
199 vg_line( p1
, p2
, colour
);
200 vg_line( p1
, p3
, colour
);
203 VG_STATIC
void vg_line_boxf( boxf box
, u32 colour
)
205 v3f p000
, p001
, p010
, p011
, p100
, p101
, p110
, p111
;
207 p000
[0]=box
[0][0];p000
[1]=box
[0][1];p000
[2]=box
[0][2];
208 p001
[0]=box
[0][0];p001
[1]=box
[0][1];p001
[2]=box
[1][2];
209 p010
[0]=box
[0][0];p010
[1]=box
[1][1];p010
[2]=box
[0][2];
210 p011
[0]=box
[0][0];p011
[1]=box
[1][1];p011
[2]=box
[1][2];
212 p100
[0]=box
[1][0];p100
[1]=box
[0][1];p100
[2]=box
[0][2];
213 p101
[0]=box
[1][0];p101
[1]=box
[0][1];p101
[2]=box
[1][2];
214 p110
[0]=box
[1][0];p110
[1]=box
[1][1];p110
[2]=box
[0][2];
215 p111
[0]=box
[1][0];p111
[1]=box
[1][1];p111
[2]=box
[1][2];
217 vg_line( p000
, p001
, colour
);
218 vg_line( p001
, p011
, colour
);
219 vg_line( p011
, p010
, colour
);
220 vg_line( p010
, p000
, colour
);
222 vg_line( p100
, p101
, colour
);
223 vg_line( p101
, p111
, colour
);
224 vg_line( p111
, p110
, colour
);
225 vg_line( p110
, p100
, colour
);
227 vg_line( p100
, p000
, colour
);
228 vg_line( p101
, p001
, colour
);
229 vg_line( p110
, p010
, colour
);
230 vg_line( p111
, p011
, colour
);
233 VG_STATIC
void vg_line_boxf_transformed( m4x3f m
, boxf box
, u32 colour
)
235 v3f p000
, p001
, p010
, p011
, p100
, p101
, p110
, p111
;
237 p000
[0]=box
[0][0];p000
[1]=box
[0][1];p000
[2]=box
[0][2];
238 p001
[0]=box
[0][0];p001
[1]=box
[0][1];p001
[2]=box
[1][2];
239 p010
[0]=box
[0][0];p010
[1]=box
[1][1];p010
[2]=box
[0][2];
240 p011
[0]=box
[0][0];p011
[1]=box
[1][1];p011
[2]=box
[1][2];
242 p100
[0]=box
[1][0];p100
[1]=box
[0][1];p100
[2]=box
[0][2];
243 p101
[0]=box
[1][0];p101
[1]=box
[0][1];p101
[2]=box
[1][2];
244 p110
[0]=box
[1][0];p110
[1]=box
[1][1];p110
[2]=box
[0][2];
245 p111
[0]=box
[1][0];p111
[1]=box
[1][1];p111
[2]=box
[1][2];
247 m4x3_mulv( m
, p000
, p000
);
248 m4x3_mulv( m
, p001
, p001
);
249 m4x3_mulv( m
, p010
, p010
);
250 m4x3_mulv( m
, p011
, p011
);
251 m4x3_mulv( m
, p100
, p100
);
252 m4x3_mulv( m
, p101
, p101
);
253 m4x3_mulv( m
, p110
, p110
);
254 m4x3_mulv( m
, p111
, p111
);
256 vg_line( p000
, p001
, colour
);
257 vg_line( p001
, p011
, colour
);
258 vg_line( p011
, p010
, colour
);
259 vg_line( p010
, p000
, colour
);
261 vg_line( p100
, p101
, colour
);
262 vg_line( p101
, p111
, colour
);
263 vg_line( p111
, p110
, colour
);
264 vg_line( p110
, p100
, colour
);
266 vg_line( p100
, p000
, colour
);
267 vg_line( p101
, p001
, colour
);
268 vg_line( p110
, p010
, colour
);
269 vg_line( p111
, p011
, colour
);
271 vg_line( p000
, p110
, colour
);
272 vg_line( p100
, p010
, colour
);
275 VG_STATIC
void vg_line_cross(v3f pos
,u32 colour
, float scale
)
278 v3_add( (v3f
){ scale
,0.0f
,0.0f
}, pos
, p0
);
279 v3_add( (v3f
){-scale
,0.0f
,0.0f
}, pos
, p1
);
280 vg_line( p0
, p1
, colour
);
281 v3_add( (v3f
){0.0f
, scale
,0.0f
}, pos
, p0
);
282 v3_add( (v3f
){0.0f
,-scale
,0.0f
}, pos
, p1
);
283 vg_line( p0
, p1
, colour
);
284 v3_add( (v3f
){0.0f
,0.0f
, scale
}, pos
, p0
);
285 v3_add( (v3f
){0.0f
,0.0f
,-scale
}, pos
, p1
);
286 vg_line( p0
, p1
, colour
);
289 VG_STATIC
void vg_line_pt3( v3f pt
, float size
, u32 colour
)
293 { pt
[0]-size
, pt
[1]-size
, pt
[2]-size
},
294 { pt
[0]+size
, pt
[1]+size
, pt
[2]+size
}
297 vg_line_boxf( box
, colour
);
300 #endif /* VG_LINES_H */