1 /* Copyright (C) 2021-2022 Harry Godden (hgn) - All Rights Reserved */
3 static int debug_lines_enable
= 1;
11 static struct vg_shader _shader_lines
=
22 "layout (location=0) in vec3 a_co;"
25 "layout (location=0) in vec2 a_co;"
27 "layout (location=1) in vec4 a_colour;"
34 " vec4 vert_pos = uPv * vec4( a_co, 1.0 );"
36 " vec4 vert_pos = vec4( uPv * vec3( a_co, 1.0 ), 1.0 );"
38 " s_colour = a_colour;"
39 " gl_Position = vert_pos;"
53 " FragColor = s_colour;"
73 u32 draw_idx
, cap
, buffer_size
;
77 static void vg_lines_init(void)
79 vg_convar_push( (struct vg_convar
){
80 .name
= "debug_lines",
81 .data
= &debug_lines_enable
,
82 .data_type
= k_convar_dtype_i32
,
83 .opt_i32
= { .min
=0, .max
=1, .clamp
=1 },
87 vg_shader_register( &_shader_lines
);
89 glGenVertexArrays( 1, &vg_lines
.vao
);
90 glGenBuffers( 1, &vg_lines
.vbo
);
91 glBindVertexArray( vg_lines
.vao
);
93 glBindBuffer( GL_ARRAY_BUFFER
, vg_lines
.vbo
);
96 vg_lines
.buffer_size
= vg_lines
.cap
* sizeof( struct vg_lines_vert
);
98 glBufferData( GL_ARRAY_BUFFER
, vg_lines
.buffer_size
, NULL
, GL_DYNAMIC_DRAW
);
99 glBindVertexArray( vg_lines
.vao
);
101 glVertexAttribPointer(
103 sizeof( vg_lines
.buffer
[0].co
) / sizeof(float),
106 sizeof( struct vg_lines_vert
),
109 glEnableVertexAttribArray( 0 );
111 glVertexAttribPointer(
116 sizeof( struct vg_lines_vert
),
117 (void*)(offsetof( struct vg_lines_vert
, colour
))
119 glEnableVertexAttribArray( 1 );
120 vg_lines
.buffer
= malloc( vg_lines
.buffer_size
);
123 static void vg_lines_free(void)
125 glDeleteVertexArrays( 1, &vg_lines
.vao
);
126 glDeleteBuffers( 1, &vg_lines
.vbo
);
128 free( vg_lines
.buffer
);
131 static void vg_lines_drawall( float* projection
)
133 glUseProgram( _shader_lines
.id
);
140 ( glGetUniformLocation( _shader_lines
.id
, "uPv" ), 1, GL_FALSE
, projection
);
142 glBindVertexArray( vg_lines
.vao
);
143 glBindBuffer( GL_ARRAY_BUFFER
, vg_lines
.vbo
);
145 glBufferSubData( GL_ARRAY_BUFFER
, 0, vg_lines
.draw_idx
*
146 sizeof(struct vg_lines_vert
), vg_lines
.buffer
);
148 glEnable( GL_BLEND
);
149 glBlendFunc( GL_SRC_ALPHA
, GL_ONE_MINUS_SRC_ALPHA
);
150 glBlendEquation( GL_FUNC_ADD
);
152 if( debug_lines_enable
)
153 glDrawArrays( GL_LINES
, 0, vg_lines
.draw_idx
);
155 glDisable( GL_BLEND
);
156 vg_lines
.draw_idx
= 0;
159 static void vg_line2( line_co from
, line_co to
, u32 fc
, u32 tc
)
161 struct vg_lines_vert
*v
= &vg_lines
.buffer
[vg_lines
.draw_idx
];
164 v3_copy( from
, v
[0].co
);
165 v3_copy( to
, v
[1].co
);
167 v2_copy( from
, v
[0].co
);
168 v2_copy( to
, v
[1].co
);
174 vg_lines
.draw_idx
+= 2;
177 static void vg_line( line_co from
, line_co to
, u32 colour
)
179 vg_line2( from
, to
, colour
, colour
);
182 static void vg_line_box( line_co min
, line_co max
, u32 colour
)
187 vg_line( min
, (v2f
){min
[0],max
[1]}, colour
);
188 vg_line( (v2f
){min
[0],max
[1]}, max
, colour
);
189 vg_line( max
, (v2f
){max
[0],min
[1]}, colour
);
190 vg_line( (v2f
){max
[0],min
[1]}, min
, colour
);
194 static void vg_line_boxf( boxf box
, u32 colour
)
196 v3f p000
, p001
, p010
, p011
, p100
, p101
, p110
, p111
;
198 p000
[0]=box
[0][0];p000
[1]=box
[0][1];p000
[2]=box
[0][2];
199 p001
[0]=box
[0][0];p001
[1]=box
[0][1];p001
[2]=box
[1][2];
200 p010
[0]=box
[0][0];p010
[1]=box
[1][1];p010
[2]=box
[0][2];
201 p011
[0]=box
[0][0];p011
[1]=box
[1][1];p011
[2]=box
[1][2];
203 p100
[0]=box
[1][0];p100
[1]=box
[0][1];p100
[2]=box
[0][2];
204 p101
[0]=box
[1][0];p101
[1]=box
[0][1];p101
[2]=box
[1][2];
205 p110
[0]=box
[1][0];p110
[1]=box
[1][1];p110
[2]=box
[0][2];
206 p111
[0]=box
[1][0];p111
[1]=box
[1][1];p111
[2]=box
[1][2];
208 vg_line( p000
, p001
, colour
);
209 vg_line( p001
, p011
, colour
);
210 vg_line( p011
, p010
, colour
);
211 vg_line( p010
, p000
, colour
);
213 vg_line( p100
, p101
, colour
);
214 vg_line( p101
, p111
, colour
);
215 vg_line( p111
, p110
, colour
);
216 vg_line( p110
, p100
, colour
);
218 vg_line( p100
, p000
, colour
);
219 vg_line( p101
, p001
, colour
);
220 vg_line( p110
, p010
, colour
);
221 vg_line( p111
, p011
, colour
);
224 static void vg_line_boxf_transformed( m4x3f m
, boxf box
, u32 colour
)
226 v3f p000
, p001
, p010
, p011
, p100
, p101
, p110
, p111
;
228 p000
[0]=box
[0][0];p000
[1]=box
[0][1];p000
[2]=box
[0][2];
229 p001
[0]=box
[0][0];p001
[1]=box
[0][1];p001
[2]=box
[1][2];
230 p010
[0]=box
[0][0];p010
[1]=box
[1][1];p010
[2]=box
[0][2];
231 p011
[0]=box
[0][0];p011
[1]=box
[1][1];p011
[2]=box
[1][2];
233 p100
[0]=box
[1][0];p100
[1]=box
[0][1];p100
[2]=box
[0][2];
234 p101
[0]=box
[1][0];p101
[1]=box
[0][1];p101
[2]=box
[1][2];
235 p110
[0]=box
[1][0];p110
[1]=box
[1][1];p110
[2]=box
[0][2];
236 p111
[0]=box
[1][0];p111
[1]=box
[1][1];p111
[2]=box
[1][2];
238 m4x3_mulv( m
, p000
, p000
);
239 m4x3_mulv( m
, p001
, p001
);
240 m4x3_mulv( m
, p010
, p010
);
241 m4x3_mulv( m
, p011
, p011
);
242 m4x3_mulv( m
, p100
, p100
);
243 m4x3_mulv( m
, p101
, p101
);
244 m4x3_mulv( m
, p110
, p110
);
245 m4x3_mulv( m
, p111
, p111
);
247 vg_line( p000
, p001
, colour
);
248 vg_line( p001
, p011
, colour
);
249 vg_line( p011
, p010
, colour
);
250 vg_line( p010
, p000
, colour
);
252 vg_line( p100
, p101
, colour
);
253 vg_line( p101
, p111
, colour
);
254 vg_line( p111
, p110
, colour
);
255 vg_line( p110
, p100
, colour
);
257 vg_line( p100
, p000
, colour
);
258 vg_line( p101
, p001
, colour
);
259 vg_line( p110
, p010
, colour
);
260 vg_line( p111
, p011
, colour
);
262 vg_line( p000
, p110
, colour
);
263 vg_line( p100
, p010
, colour
);
266 static void vg_line_pt3( v3f pt
, float size
, u32 colour
)
270 { pt
[0]-size
, pt
[1]-size
, pt
[2]-size
},
271 { pt
[0]+size
, pt
[1]+size
, pt
[2]+size
}
274 vg_line_boxf( box
, colour
);