gate.h

   1 #ifndef GATE_H
   2 #define GATE_H
   3
   4 #define VG_3D
   5 #include "vg/vg.h"
   6 #include "model.h"
   7 #include "render.h"
   8 #include "shaders/gate.h"
   9
  10 typedef struct teleport_gate teleport_gate;
  11
  12 static struct
  13 {
  14    GLuint fb, rgb, rb;
  15    glmesh mdl;
  16 }
  17 grender;
  18
  19 struct teleport_gate
  20 {
  21    v3f co;
  22    v4f q;
  23    v2f dims;
  24
  25    m4x3f to_world, to_local;
  26    teleport_gate *other;
  27 };
  28
  29 static void gate_transform_update( teleport_gate *gate )
  30 {
  31    q_m3x3( gate->q, gate->to_world );
  32    v3_copy( gate->co, gate->to_world[3] );
  33
  34    m4x3_invert_affine( gate->to_world, gate->to_local );
  35 }
  36
  37 static void gate_register(void)
  38 {
  39    shader_gate_register();
  40 }
  41
  42 static void gate_init(void)
  43 {
  44    create_renderbuffer_std( &grender.fb, &grender.rgb, &grender.rb );
  45
  46    model *mgate = vg_asset_read( "models/rs_gate.mdl" );
  47    model_unpack( mgate, &grender.mdl );
  48    free( mgate );
  49 }
  50
  51 static void gate_fb_resize(void)
  52 {
  53    resize_renderbuffer_std( &grender.fb, &grender.rgb, &grender.rb );
  54 }
  55
  56 static void render_gate( teleport_gate *gate, m4x3f camera )
  57 {
  58    v3f viewpos, viewdir, gatedir;
  59    v3_copy( camera[3], viewpos );
  60    m3x3_mulv( camera, (v3f){0.0f,0.0f,-1.0f}, viewdir );
  61    m3x3_mulv( gate->to_world, (v3f){0.0f,0.0f,-1.0f}, gatedir );
  62
  63    if( v3_dot(viewdir, gatedir) <= 0.0f )
  64       return;
  65
  66    v3f v0;
  67    v3_sub( viewpos, gate->co, v0 );
  68    if( v3_dot(v0, gatedir) >= 0.0f )
  69       return;
  70
  71    m4x3f transport;
  72    m4x3_mul( gate->other->to_world, gate->to_local, transport );
  73
  74    v3f a,b,c,d;
  75
  76    float sx = gate->dims[0],
  77          sy = gate->dims[1];
  78    m4x3_mulv( gate->to_world, (v3f){-sx,-sy,0.0f}, a );
  79    m4x3_mulv( gate->to_world, (v3f){ sx,-sy,0.0f}, b );
  80    m4x3_mulv( gate->to_world, (v3f){ sx, sy,0.0f}, c );
  81    m4x3_mulv( gate->to_world, (v3f){-sx, sy,0.0f}, d );
  82
  83    vg_line( a,b, 0xffffa000 );
  84    vg_line( b,c, 0xffffa000 );
  85    vg_line( c,d, 0xffffa000 );
  86    vg_line( d,a, 0xffffa000 );
  87
  88    vg_line( gate->co, gate->other->co, 0xffffffff );
  89
  90    m4x3f cam_new;
  91    m4x3_mul( transport, camera, cam_new );
  92
  93    vg_line_pt3( cam_new[3], 0.3f, 0xff00ff00 );
  94
  95    glBindFramebuffer( GL_FRAMEBUFFER, grender.fb );
  96    glClearColor( 0.11f, 0.35f, 0.37f, 1.0f );
  97    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
  98
  99    m4x3f inverse;
 100    m4x3_invert_affine( cam_new, inverse );
 101
 102    m4x4f view;
 103    m4x3_expand( inverse, view );
 104
 105    v4f surface;
 106    m3x3_mulv( gate->other->to_world, (v3f){0.0f,0.0f,-1.0f}, surface );
 107    surface[3] = v3_dot( surface, gate->other->co );
 108
 109    m4x4f projection;
 110    pipeline_projection( projection, 0.1f, 900.0f );
 111
 112 #if 0 /* For debugging frustum */
 113    {
 114       m4x4f devm;
 115       m4x4_mul( projection, view, devm );
 116       m4x4_inv( devm, devm );
 117
 118       v4f corners[] =
 119       {
 120          {-1,-1,-1, 1}, { 1,-1,-1, 1}, { 1, 1,-1, 1}, {-1, 1,-1, 1},
 121          {-1,-1, 1, 1}, { 1,-1, 1, 1}, { 1, 1, 1, 1}, {-1, 1, 1, 1}
 122       };
 123
 124       for( int i=0; i<vg_list_size(corners); i++ )
 125       {
 126          m4x4_mulv( devm, corners[i], corners[i] );
 127          v3_muls( corners[i], 1.0f/corners[i][3], corners[i] );
 128       }
 129
 130       vg_line( corners[0], corners[1], 0xffffffff );
 131       vg_line( corners[1], corners[2], 0xffffffff );
 132       vg_line( corners[2], corners[3], 0xffffffff );
 133       vg_line( corners[3], corners[0], 0xffffffff );
 134       vg_line( corners[4], corners[5], 0xffffffff );
 135       vg_line( corners[5], corners[6], 0xffffffff );
 136       vg_line( corners[6], corners[7], 0xffffffff );
 137       vg_line( corners[7], corners[4], 0xffffffff );
 138       vg_line( corners[0], corners[4], 0xffffffff );
 139       vg_line( corners[1], corners[5], 0xffffffff );
 140       vg_line( corners[2], corners[6], 0xffffffff );
 141       vg_line( corners[3], corners[7], 0xffffffff );
 142
 143       v3f clipped[4];
 144       for( int i=0; i<4; i++ )
 145       {
 146          v3f v0, c, delta, p0;
 147          v3_sub( corners[4+i],corners[0+i], v0 );
 148          v3_normalize(v0);
 149
 150          v3_muls( surface, surface[3], c );
 151          v3_sub( c, corners[0+i], delta );
 152
 153          float t = v3_dot(delta, surface) / v3_dot(surface, v0);
 154          v3_muladds( corners[0+i], v0, t, clipped[i] );
 155       }
 156
 157       vg_line( clipped[0], clipped[1], 0xff0000ff );
 158       vg_line( clipped[1], clipped[2], 0xff0000ff );
 159       vg_line( clipped[2], clipped[3], 0xff0000ff );
 160       vg_line( clipped[3], clipped[0], 0xff0000ff );
 161
 162       m4x3_mulv( gate->other->to_world, (v3f){-2.0f,-2.0f,0.0f}, a );
 163       m4x3_mulv( gate->other->to_world, (v3f){ 2.0f,-2.0f,0.0f}, b );
 164       m4x3_mulv( gate->other->to_world, (v3f){ 2.0f, 2.0f,0.0f}, c );
 165       m4x3_mulv( gate->other->to_world, (v3f){-2.0f, 2.0f,0.0f}, d );
 166
 167       vg_line( clipped[0], a, 0xff0000ff );
 168       vg_line( clipped[1], b, 0xff0000ff );
 169       vg_line( clipped[2], c, 0xff0000ff );
 170       vg_line( clipped[3], d, 0xff0000ff );
 171    }
 172 #endif
 173
 174    m4x3_mulp( inverse, surface, surface );
 175    surface[3] = -fabsf(surface[3]);
 176    plane_clip_projection( projection, surface );
 177
 178    m4x4_mul( projection, view, projection );
 179
 180    render_world( projection, cam_new );
 181    render_water_texture( cam_new );
 182    glBindFramebuffer( GL_FRAMEBUFFER, grender.fb );
 183    render_water_surface( projection );
 184    glBindFramebuffer( GL_FRAMEBUFFER, 0 );
 185
 186    shader_gate_use();
 187
 188    m4x3f full;
 189    m4x3_copy( gate->to_world, full );
 190    m4x3_scalev( full, (v3f){ gate->dims[0], gate->dims[1], 1.0f } );
 191
 192    shader_gate_uPv( vg_pv );
 193    shader_gate_uMdl( full );
 194
 195    glActiveTexture( GL_TEXTURE0 );
 196    glBindTexture( GL_TEXTURE_2D, grender.rgb );
 197    shader_gate_uCam( viewpos );
 198    shader_gate_uTexMain( 0 );
 199    shader_gate_uTexWater( 1 );
 200    shader_gate_uTime( vg_time*0.25f );
 201    shader_gate_uInvRes( (v2f){
 202          1.0f / (float)vg_window_x,
 203          1.0f / (float)vg_window_y });
 204
 205    glEnable(GL_BLEND);
 206    glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 207    glBlendEquation(GL_FUNC_ADD);
 208
 209    mesh_bind( &grender.mdl );
 210    mesh_draw( &grender.mdl );
 211
 212    glDisable(GL_BLEND);
 213 }
 214
 215 static int gate_intersect( teleport_gate *gate, v3f pos, v3f last )
 216 {
 217    v4f surface;
 218    m3x3_mulv( gate->to_world, (v3f){0.0f,0.0f,-1.0f}, surface );
 219    surface[3] = v3_dot( surface, gate->co );
 220
 221    v3f v0, c, delta, p0;
 222    v3_sub( pos, last, v0 );
 223    float l = v3_length( v0 );
 224    v3_divs( v0, l, v0 );
 225
 226    v3_muls( surface, surface[3], c );
 227    v3_sub( c, last, delta );
 228
 229    float d = v3_dot(surface, v0);
 230
 231    if( fabsf(d) > 0.00001f )
 232    {
 233       float t = v3_dot(delta, surface) / d;
 234       if( t >= 0.0f && t <= l )
 235       {
 236          v3f local, rel;
 237          v3_muladds( last, v0, t, local );
 238          v3_sub( gate->co, local, rel );
 239
 240          v3f vup, vside;
 241          m3x3_mulv( gate->to_world, (v3f){0.0f,1.0f,0.0f}, vup );
 242          m3x3_mulv( gate->to_world, (v3f){1.0f,0.0f,0.0f}, vside );
 243
 244          v2f xy = { v3_dot( rel, vside ), v3_dot( rel, vup ) };
 245
 246          if( fabsf(xy[0]) <= gate->dims[0] && fabsf(xy[1]) <= gate->dims[1] )
 247          {
 248             return 1;
 249          }
 250       }
 251    }
 252
 253    return 0;
 254 }
 255
 256 #endif