vg_lines.h

   1 /* Copyright (C) 2021-2022 Harry Godden (hgn) - All Rights Reserved */
   2
   3 #ifndef VG_LINES_H
   4 #define VG_LINES_H
   5
   6 #include "vg/vg.h"
   7
   8 typedef v3f line_co;
   9
  10 static struct vg_shader _shader_lines =
  11 {
  12    .name = "[vg] lines",
  13    .link = NULL,
  14    .vs =
  15    {
  16       .orig_file = NULL,
  17       .static_src =
  18
  19         "uniform mat4 uPv;"
  20         "layout (location=0) in vec3 a_co;"
  21         "layout (location=1) in vec4 a_colour;"
  22         ""
  23         "out vec4 s_colour;"
  24         ""
  25         "void main()"
  26         "{"
  27         "       vec4 vert_pos = uPv * vec4( a_co, 1.0 );"
  28         "  s_colour = a_colour;"
  29         "       gl_Position = vert_pos;"
  30         "}"
  31    },
  32    .fs =
  33    {
  34       .orig_file = NULL,
  35       .static_src =
  36
  37         "out vec4 FragColor;"
  38         ""
  39         "in vec4 s_colour;"
  40         ""
  41         "void main()"
  42         "{"
  43         "       FragColor = s_colour;"
  44         "}"
  45    }
  46 };
  47
  48
  49 struct
  50 {
  51    u32 draw,
  52        allow_input;
  53
  54    struct vg_lines_vert
  55    {
  56       v3f co;
  57       u32 colour;
  58    }
  59    *vertex_buffer;
  60
  61         GLuint vao, vbo;
  62 }
  63 static vg_lines;
  64
  65 VG_STATIC void vg_lines_init(void)
  66 {
  67    vg_info( "vg_lines_init\n" );
  68
  69    vg_convar_push( (struct vg_convar){
  70       .name = "vg_lines",
  71       .data = &vg_lines.draw,
  72       .data_type = k_convar_dtype_i32,
  73       .opt_i32 = { .min=0, .max=1, .clamp=1 },
  74       .persistent = 1
  75    });
  76
  77    vg_shader_register( &_shader_lines );
  78
  79    vg_acquire_thread_sync();
  80    {
  81       glGenVertexArrays( 1, &vg_lines.vao );
  82       glGenBuffers( 1, &vg_lines.vbo );
  83       glBindVertexArray( vg_lines.vao );
  84       glBindBuffer( GL_ARRAY_BUFFER, vg_lines.vbo );
  85
  86       u32 size = 50000 * sizeof( struct vg_lines_vert );
  87
  88       vg_lines.vertex_buffer =
  89          vg_create_linear_allocator(vg_mem.rtmemory, size, VG_MEMORY_REALTIME);
  90
  91       glBufferData( GL_ARRAY_BUFFER, size, NULL, GL_DYNAMIC_DRAW );
  92       glBindVertexArray( vg_lines.vao );
  93       VG_CHECK_GL_ERR();
  94
  95       /* Pointers */
  96       glVertexAttribPointer(
  97          0,
  98          3,
  99          GL_FLOAT,
 100          GL_FALSE,
 101          sizeof( struct vg_lines_vert ),
 102          (void *)0
 103       );
 104       glEnableVertexAttribArray( 0 );
 105
 106       glVertexAttribPointer(
 107          1,
 108          4,
 109          GL_UNSIGNED_BYTE,
 110          GL_TRUE,
 111          sizeof( struct vg_lines_vert ),
 112          (void*)(offsetof( struct vg_lines_vert, colour ))
 113       );
 114       glEnableVertexAttribArray( 1 );
 115
 116       VG_CHECK_GL_ERR();
 117       vg_success( "done\n" );
 118    }
 119
 120    vg_release_thread_sync();
 121    vg_lines.allow_input = 1;
 122 }
 123
 124 VG_STATIC void vg_lines_drawall( float* projection )
 125 {
 126         glUseProgram( _shader_lines.id );
 127
 128    glUniformMatrix4fv
 129    ( glGetUniformLocation( _shader_lines.id, "uPv" ), 1, GL_FALSE, projection );
 130
 131         glBindVertexArray( vg_lines.vao );
 132         glBindBuffer( GL_ARRAY_BUFFER, vg_lines.vbo );
 133
 134    u32 bufusage = vg_linear_get_cur(vg_lines.vertex_buffer);
 135
 136         glBufferSubData( GL_ARRAY_BUFFER, 0, bufusage, vg_lines.vertex_buffer );
 137
 138         glEnable( GL_BLEND );
 139         glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
 140         glBlendEquation( GL_FUNC_ADD );
 141
 142    if( vg_lines.draw )
 143       glDrawArrays( GL_LINES, 0, bufusage / sizeof(struct vg_lines_vert) );
 144
 145         glDisable( GL_BLEND );
 146    vg_linear_clear( vg_lines.vertex_buffer );
 147 }
 148
 149 VG_STATIC void vg_line2( line_co from, line_co to, u32 fc, u32 tc )
 150 {
 151    if( !vg_lines.allow_input )
 152       return;
 153
 154    u32 size = 2 * sizeof(struct vg_lines_vert);
 155         struct vg_lines_vert *v = vg_linear_alloc( vg_lines.vertex_buffer, size );
 156
 157         v3_copy( from, v[0].co );
 158         v3_copy( to, v[1].co );
 159
 160         v[0].colour = fc;
 161         v[1].colour = tc;
 162 }
 163
 164 VG_STATIC void vg_line( line_co from, line_co to, u32 colour )
 165 {
 166         vg_line2( from, to, colour, colour );
 167 }
 168
 169 VG_STATIC void vg_line_boxf( boxf box, u32 colour )
 170 {
 171    v3f p000, p001, p010, p011, p100, p101, p110, p111;
 172
 173    p000[0]=box[0][0];p000[1]=box[0][1];p000[2]=box[0][2];
 174    p001[0]=box[0][0];p001[1]=box[0][1];p001[2]=box[1][2];
 175    p010[0]=box[0][0];p010[1]=box[1][1];p010[2]=box[0][2];
 176    p011[0]=box[0][0];p011[1]=box[1][1];p011[2]=box[1][2];
 177
 178    p100[0]=box[1][0];p100[1]=box[0][1];p100[2]=box[0][2];
 179    p101[0]=box[1][0];p101[1]=box[0][1];p101[2]=box[1][2];
 180    p110[0]=box[1][0];p110[1]=box[1][1];p110[2]=box[0][2];
 181    p111[0]=box[1][0];p111[1]=box[1][1];p111[2]=box[1][2];
 182
 183    vg_line( p000, p001, colour );
 184    vg_line( p001, p011, colour );
 185    vg_line( p011, p010, colour );
 186    vg_line( p010, p000, colour );
 187
 188    vg_line( p100, p101, colour );
 189    vg_line( p101, p111, colour );
 190    vg_line( p111, p110, colour );
 191    vg_line( p110, p100, colour );
 192
 193    vg_line( p100, p000, colour );
 194    vg_line( p101, p001, colour );
 195    vg_line( p110, p010, colour );
 196    vg_line( p111, p011, colour );
 197 }
 198
 199 VG_STATIC void vg_line_boxf_transformed( m4x3f m, boxf box, u32 colour )
 200 {
 201    v3f p000, p001, p010, p011, p100, p101, p110, p111;
 202
 203    p000[0]=box[0][0];p000[1]=box[0][1];p000[2]=box[0][2];
 204    p001[0]=box[0][0];p001[1]=box[0][1];p001[2]=box[1][2];
 205    p010[0]=box[0][0];p010[1]=box[1][1];p010[2]=box[0][2];
 206    p011[0]=box[0][0];p011[1]=box[1][1];p011[2]=box[1][2];
 207
 208    p100[0]=box[1][0];p100[1]=box[0][1];p100[2]=box[0][2];
 209    p101[0]=box[1][0];p101[1]=box[0][1];p101[2]=box[1][2];
 210    p110[0]=box[1][0];p110[1]=box[1][1];p110[2]=box[0][2];
 211    p111[0]=box[1][0];p111[1]=box[1][1];p111[2]=box[1][2];
 212
 213    m4x3_mulv( m, p000, p000 );
 214    m4x3_mulv( m, p001, p001 );
 215    m4x3_mulv( m, p010, p010 );
 216    m4x3_mulv( m, p011, p011 );
 217    m4x3_mulv( m, p100, p100 );
 218    m4x3_mulv( m, p101, p101 );
 219    m4x3_mulv( m, p110, p110 );
 220    m4x3_mulv( m, p111, p111 );
 221
 222    vg_line( p000, p001, colour );
 223    vg_line( p001, p011, colour );
 224    vg_line( p011, p010, colour );
 225    vg_line( p010, p000, colour );
 226
 227    vg_line( p100, p101, colour );
 228    vg_line( p101, p111, colour );
 229    vg_line( p111, p110, colour );
 230    vg_line( p110, p100, colour );
 231
 232    vg_line( p100, p000, colour );
 233    vg_line( p101, p001, colour );
 234    vg_line( p110, p010, colour );
 235    vg_line( p111, p011, colour );
 236
 237    vg_line( p000, p110, colour );
 238    vg_line( p100, p010, colour );
 239 }
 240
 241 VG_STATIC void vg_line_cross(v3f pos,u32 colour, float scale)
 242 {
 243    v3f p0, p1;
 244    v3_add( (v3f){ scale,0.0f,0.0f}, pos, p0 );
 245    v3_add( (v3f){-scale,0.0f,0.0f}, pos, p1 );
 246    vg_line( p0, p1, colour );
 247    v3_add( (v3f){0.0f, scale,0.0f}, pos, p0 );
 248    v3_add( (v3f){0.0f,-scale,0.0f}, pos, p1 );
 249    vg_line( p0, p1, colour );
 250    v3_add( (v3f){0.0f,0.0f, scale}, pos, p0 );
 251    v3_add( (v3f){0.0f,0.0f,-scale}, pos, p1 );
 252    vg_line( p0, p1, colour );
 253 }
 254
 255 VG_STATIC void vg_line_pt3( v3f pt, float size, u32 colour )
 256 {
 257    boxf box =
 258    {
 259       { pt[0]-size, pt[1]-size, pt[2]-size },
 260       { pt[0]+size, pt[1]+size, pt[2]+size }
 261    };
 262
 263    vg_line_boxf( box, colour );
 264 }
 265
 266 #endif /* VG_LINES_H */