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