src/vg/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
  53    struct vg_lines_vert
  54    {
  55       v3f co;
  56       u32 colour;
  57    }
  58    *vertex_buffer;
  59
  60         GLuint vao, vbo;
  61 }
  62 static vg_lines;
  63
  64 VG_STATIC void vg_lines_init(void)
  65 {
  66    vg_info( "vg_lines_init\n" );
  67
  68    vg_convar_push( (struct vg_convar){
  69       .name = "vg_lines",
  70       .data = &vg_lines.draw,
  71       .data_type = k_convar_dtype_i32,
  72       .opt_i32 = { .min=0, .max=1, .clamp=1 },
  73       .persistent = 1
  74    });
  75
  76    vg_shader_register( &_shader_lines );
  77
  78    vg_acquire_thread_sync();
  79    {
  80       glGenVertexArrays( 1, &vg_lines.vao );
  81       glGenBuffers( 1, &vg_lines.vbo );
  82       glBindVertexArray( vg_lines.vao );
  83       glBindBuffer( GL_ARRAY_BUFFER, vg_lines.vbo );
  84
  85       u32 size = 50000 * sizeof( struct vg_lines_vert );
  86
  87       vg_lines.vertex_buffer =
  88          vg_create_linear_allocator( vg_mem.rtmemory, size );
  89
  90       glBufferData( GL_ARRAY_BUFFER, size, NULL, GL_DYNAMIC_DRAW );
  91       glBindVertexArray( vg_lines.vao );
  92       VG_CHECK_GL_ERR();
  93
  94       /* Pointers */
  95       glVertexAttribPointer(
  96          0,
  97          3,
  98          GL_FLOAT,
  99          GL_FALSE,
 100          sizeof( struct vg_lines_vert ),
 101          (void *)0
 102       );
 103       glEnableVertexAttribArray( 0 );
 104
 105       glVertexAttribPointer(
 106          1,
 107          4,
 108          GL_UNSIGNED_BYTE,
 109          GL_TRUE,
 110          sizeof( struct vg_lines_vert ),
 111          (void*)(offsetof( struct vg_lines_vert, colour ))
 112       );
 113       glEnableVertexAttribArray( 1 );
 114
 115       VG_CHECK_GL_ERR();
 116       vg_success( "done\n" );
 117    }
 118
 119    vg_release_thread_sync();
 120 }
 121
 122 VG_STATIC void vg_lines_drawall( float* projection )
 123 {
 124         glUseProgram( _shader_lines.id );
 125
 126    glUniformMatrix4fv
 127    ( glGetUniformLocation( _shader_lines.id, "uPv" ), 1, GL_FALSE, projection );
 128
 129         glBindVertexArray( vg_lines.vao );
 130         glBindBuffer( GL_ARRAY_BUFFER, vg_lines.vbo );
 131
 132    u32 bufusage = vg_linear_get_cur(vg_lines.vertex_buffer);
 133
 134         glBufferSubData( GL_ARRAY_BUFFER, 0, bufusage, vg_lines.vertex_buffer );
 135
 136         glEnable( GL_BLEND );
 137         glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
 138         glBlendEquation( GL_FUNC_ADD );
 139
 140    if( vg_lines.draw )
 141       glDrawArrays( GL_LINES, 0, bufusage / sizeof(struct vg_lines_vert) );
 142
 143         glDisable( GL_BLEND );
 144    vg_linear_clear( vg_lines.vertex_buffer );
 145 }
 146
 147 VG_STATIC void vg_line2( line_co from, line_co to, u32 fc, u32 tc )
 148 {
 149    u32 size = 2 * sizeof(struct vg_lines_vert);
 150         struct vg_lines_vert *v = vg_linear_alloc( vg_lines.vertex_buffer, size );
 151
 152         v3_copy( from, v[0].co );
 153         v3_copy( to, v[1].co );
 154
 155         v[0].colour = fc;
 156         v[1].colour = tc;
 157 }
 158
 159 VG_STATIC void vg_line( line_co from, line_co to, u32 colour )
 160 {
 161         vg_line2( from, to, colour, colour );
 162 }
 163
 164 VG_STATIC void vg_line_boxf( boxf box, u32 colour )
 165 {
 166    v3f p000, p001, p010, p011, p100, p101, p110, p111;
 167
 168    p000[0]=box[0][0];p000[1]=box[0][1];p000[2]=box[0][2];
 169    p001[0]=box[0][0];p001[1]=box[0][1];p001[2]=box[1][2];
 170    p010[0]=box[0][0];p010[1]=box[1][1];p010[2]=box[0][2];
 171    p011[0]=box[0][0];p011[1]=box[1][1];p011[2]=box[1][2];
 172
 173    p100[0]=box[1][0];p100[1]=box[0][1];p100[2]=box[0][2];
 174    p101[0]=box[1][0];p101[1]=box[0][1];p101[2]=box[1][2];
 175    p110[0]=box[1][0];p110[1]=box[1][1];p110[2]=box[0][2];
 176    p111[0]=box[1][0];p111[1]=box[1][1];p111[2]=box[1][2];
 177
 178    vg_line( p000, p001, colour );
 179    vg_line( p001, p011, colour );
 180    vg_line( p011, p010, colour );
 181    vg_line( p010, p000, colour );
 182
 183    vg_line( p100, p101, colour );
 184    vg_line( p101, p111, colour );
 185    vg_line( p111, p110, colour );
 186    vg_line( p110, p100, colour );
 187
 188    vg_line( p100, p000, colour );
 189    vg_line( p101, p001, colour );
 190    vg_line( p110, p010, colour );
 191    vg_line( p111, p011, colour );
 192 }
 193
 194 VG_STATIC void vg_line_boxf_transformed( m4x3f m, boxf box, u32 colour )
 195 {
 196    v3f p000, p001, p010, p011, p100, p101, p110, p111;
 197
 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];
 202
 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];
 207
 208    m4x3_mulv( m, p000, p000 );
 209    m4x3_mulv( m, p001, p001 );
 210    m4x3_mulv( m, p010, p010 );
 211    m4x3_mulv( m, p011, p011 );
 212    m4x3_mulv( m, p100, p100 );
 213    m4x3_mulv( m, p101, p101 );
 214    m4x3_mulv( m, p110, p110 );
 215    m4x3_mulv( m, p111, p111 );
 216
 217    vg_line( p000, p001, colour );
 218    vg_line( p001, p011, colour );
 219    vg_line( p011, p010, colour );
 220    vg_line( p010, p000, colour );
 221
 222    vg_line( p100, p101, colour );
 223    vg_line( p101, p111, colour );
 224    vg_line( p111, p110, colour );
 225    vg_line( p110, p100, colour );
 226
 227    vg_line( p100, p000, colour );
 228    vg_line( p101, p001, colour );
 229    vg_line( p110, p010, colour );
 230    vg_line( p111, p011, colour );
 231
 232    vg_line( p000, p110, colour );
 233    vg_line( p100, p010, colour );
 234 }
 235
 236 VG_STATIC void vg_line_cross(v3f pos,u32 colour, float scale)
 237 {
 238    v3f p0, p1;
 239    v3_add( (v3f){ scale,0.0f,0.0f}, pos, p0 );
 240    v3_add( (v3f){-scale,0.0f,0.0f}, pos, p1 );
 241    vg_line( p0, p1, colour );
 242    v3_add( (v3f){0.0f, scale,0.0f}, pos, p0 );
 243    v3_add( (v3f){0.0f,-scale,0.0f}, pos, p1 );
 244    vg_line( p0, p1, colour );
 245    v3_add( (v3f){0.0f,0.0f, scale}, pos, p0 );
 246    v3_add( (v3f){0.0f,0.0f,-scale}, pos, p1 );
 247    vg_line( p0, p1, colour );
 248 }
 249
 250 VG_STATIC void vg_line_pt3( v3f pt, float size, u32 colour )
 251 {
 252    boxf box =
 253    {
 254       { pt[0]-size, pt[1]-size, pt[2]-size },
 255       { pt[0]+size, pt[1]+size, pt[2]+size }
 256    };
 257
 258    vg_line_boxf( box, colour );
 259 }
 260
 261 #endif /* VG_LINES_H */