world_gate.h

   1 #ifndef WORLD_GATE_H
   2 #define WORLD_GATE_H
   3
   4 #include "common.h"
   5 #include "model.h"
   6 #include "render.h"
   7 #include "shaders/gate.h"
   8 #include "shaders/gatelq.h"
   9 #include "world_water.h"
  10
  11 typedef struct teleport_gate teleport_gate;
  12
  13 static struct
  14 {
  15    struct framebuffer fb;
  16    glmesh mdl;
  17
  18    int high_qual; /* If in high performance mode, we don't use RT's, and
  19                       instead use stencil buffers.
  20                       There is therefore no heat warp effect. */
  21 }
  22 grender =
  23 {
  24    .high_qual = 0,
  25    .fb = {
  26       .format = GL_RGB,
  27       .div = 1
  28    }
  29 };
  30
  31 static void gate_transform_update( teleport_gate *gate )
  32 {
  33    m4x3f to_local;
  34
  35    q_m3x3( gate->q[0], gate->to_world );
  36    v3_copy( gate->co[0], gate->to_world[3] );
  37
  38    m4x3_invert_affine( gate->to_world, to_local );
  39
  40    q_m3x3( gate->q[1], gate->recv_to_world );
  41    v3_copy( gate->co[1], gate->recv_to_world[3] );
  42    m4x3_mul( gate->recv_to_world, to_local, gate->transport );
  43 }
  44
  45 static int world_gates_init(void)
  46 {
  47    vg_info( "world_gates_init\n" );
  48    shader_gate_register();
  49    shader_gatelq_register();
  50
  51    mdl_header *mgate = mdl_load( "models/rs_gate.mdl" );
  52
  53    if( vg_acquire_thread_sync(1) )
  54    {
  55       if( !fb_init( &grender.fb ) )
  56       {
  57          free( mgate );
  58          vg_release_thread_sync(1);
  59          return 0;
  60       }
  61
  62       if( !mdl_unpack_glmesh( mgate, &grender.mdl ) )
  63       {
  64          free( mgate );
  65          fb_free( &grender.fb );
  66          vg_release_thread_sync(1);
  67          return 0;
  68       }
  69
  70       vg_release_thread_sync(1);
  71    }
  72    else
  73    {
  74       free( mgate );
  75       return 0;
  76    }
  77
  78    return 1;
  79 }
  80
  81 static void world_gates_free(void*_)
  82 {
  83    fb_free( &grender.fb );
  84 }
  85
  86 static void gate_fb_resize(void)
  87 {
  88    fb_resize( &grender.fb );
  89 }
  90
  91 static int render_gate( teleport_gate *gate, v3f viewpos, m4x3f camera )
  92 {
  93    v3f viewdir, gatedir;
  94    m3x3_mulv( camera, (v3f){0.0f,0.0f,-1.0f}, viewdir );
  95    m3x3_mulv( gate->to_world, (v3f){0.0f,0.0f,-1.0f}, gatedir );
  96
  97    v3f v0;
  98    v3_sub( viewpos, gate->co[0], v0 );
  99    if( v3_dot(v0, gatedir) >= 0.0f )
 100       return 0;
 101
 102    if( v3_dist( viewpos, gate->co[0] ) > 100.0f )
 103       return 0;
 104
 105    v3f a,b,c,d;
 106
 107    float sx = gate->dims[0],
 108          sy = gate->dims[1];
 109    m4x3_mulv( gate->to_world, (v3f){-sx,-sy,0.0f}, a );
 110    m4x3_mulv( gate->to_world, (v3f){ sx,-sy,0.0f}, b );
 111    m4x3_mulv( gate->to_world, (v3f){ sx, sy,0.0f}, c );
 112    m4x3_mulv( gate->to_world, (v3f){-sx, sy,0.0f}, d );
 113
 114    vg_line( a,b, 0xffffa000 );
 115    vg_line( b,c, 0xffffa000 );
 116    vg_line( c,d, 0xffffa000 );
 117    vg_line( d,a, 0xffffa000 );
 118
 119    vg_line2( gate->co[0], gate->co[1], 0xff0000ff, 0x00000000 );
 120
 121    m4x3f cam_new;
 122    m4x3_mul( gate->transport, camera, cam_new );
 123
 124    vg_line_pt3( cam_new[3], 0.3f, 0xff00ff00 );
 125
 126    m4x3f gate_xform;
 127    m4x3_copy( gate->to_world, gate_xform );
 128    m4x3_scalev( gate_xform, (v3f){ gate->dims[0], gate->dims[1], 1.0f } );
 129
 130    m4x3f inverse;
 131    m4x3_invert_affine( cam_new, inverse );
 132
 133    m4x4f view;
 134    m4x3_expand( inverse, view );
 135
 136    v4f surface;
 137    m3x3_mulv( gate->recv_to_world, (v3f){0.0f,0.0f,-1.0f}, surface );
 138    surface[3] = v3_dot( surface, gate->co[1] );
 139
 140    m4x4f projection;
 141    pipeline_projection( projection, 0.1f, 900.0f );
 142
 143    m4x3_mulp( inverse, surface, surface );
 144    surface[3] = -fabsf(surface[3]);
 145    plane_clip_projection( projection, surface );
 146
 147    m4x4_mul( projection, view, projection );
 148
 149    if( grender.high_qual )
 150    {
 151       fb_use( &grender.fb );
 152       glClearColor( 0.11f, 0.35f, 0.37f, 1.0f );
 153       glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
 154    }
 155    else
 156    {
 157       shader_gatelq_use();
 158       shader_gatelq_uPv( vg_pv );
 159       shader_gatelq_uMdl( gate_xform );
 160       shader_gatelq_uCam( viewpos );
 161       shader_gatelq_uTime( vg_time*0.25f );
 162       shader_gatelq_uInvRes( (v2f){
 163             1.0f / (float)vg_window_x,
 164             1.0f / (float)vg_window_y });
 165
 166       glEnable( GL_STENCIL_TEST );
 167       glStencilOp( GL_KEEP, GL_KEEP, GL_REPLACE );
 168       glStencilFunc( GL_ALWAYS, 1, 0xFF );
 169       glStencilMask( 0xFF );
 170
 171       mesh_bind( &grender.mdl );
 172       mesh_draw( &grender.mdl );
 173
 174       glClear( GL_DEPTH_BUFFER_BIT );
 175       glStencilFunc( GL_EQUAL, 1, 0xFF );
 176       glStencilMask( 0x00 );
 177    }
 178
 179    render_world( projection, cam_new );
 180
 181    if( grender.high_qual )
 182    {
 183       /*
 184        * TODO: Need to find a way to draw a stencil buffer into the water
 185        *       rendering
 186        */
 187
 188       render_water_texture( cam_new );
 189       fb_use( &grender.fb );
 190
 191       render_water_surface( projection, cam_new );
 192       fb_use( NULL );
 193
 194       shader_gate_use();
 195
 196       shader_gate_uPv( vg_pv );
 197       shader_gate_uMdl( gate_xform );
 198
 199       fb_bindtex( &grender.fb, 0 );
 200
 201       shader_gate_uCam( viewpos );
 202       shader_gate_uTexMain( 0 );
 203       shader_gate_uTexWater( 1 );
 204       shader_gate_uTime( vg_time*0.25f );
 205       shader_gate_uInvRes( (v2f){
 206             1.0f / (float)vg_window_x,
 207             1.0f / (float)vg_window_y });
 208
 209       glEnable(GL_BLEND);
 210       glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 211       glBlendEquation(GL_FUNC_ADD);
 212
 213       mesh_bind( &grender.mdl );
 214       mesh_draw( &grender.mdl );
 215
 216       glDisable(GL_BLEND);
 217    }
 218    else
 219    {
 220       glDisable( GL_STENCIL_TEST );
 221
 222       render_water_texture( cam_new );
 223       fb_use( NULL );
 224       glEnable( GL_STENCIL_TEST );
 225
 226       render_water_surface( projection, cam_new );
 227
 228       glStencilMask( 0xFF );
 229       glStencilFunc( GL_ALWAYS, 1, 0xFF );
 230       glDisable( GL_STENCIL_TEST );
 231    }
 232
 233    return 1;
 234 }
 235
 236 static int gate_intersect( teleport_gate *gate, v3f pos, v3f last )
 237 {
 238    v4f surface;
 239    m3x3_mulv( gate->to_world, (v3f){0.0f,0.0f,-1.0f}, surface );
 240    surface[3] = v3_dot( surface, gate->co[0] );
 241
 242    v3f v0, c, delta, p0;
 243    v3_sub( pos, last, v0 );
 244    float l = v3_length( v0 );
 245    v3_divs( v0, l, v0 );
 246
 247    v3_muls( surface, surface[3], c );
 248    v3_sub( c, last, delta );
 249
 250    float d = v3_dot(surface, v0);
 251
 252    if( d > 0.00001f )
 253    {
 254       float t = v3_dot(delta, surface) / d;
 255       if( t >= 0.0f && t <= l )
 256       {
 257          v3f local, rel;
 258          v3_muladds( last, v0, t, local );
 259          v3_sub( gate->co[0], local, rel );
 260
 261          v3f vup, vside;
 262          m3x3_mulv( gate->to_world, (v3f){0.0f,1.0f,0.0f}, vup );
 263          m3x3_mulv( gate->to_world, (v3f){1.0f,0.0f,0.0f}, vside );
 264
 265          v2f xy = { v3_dot( rel, vside ), v3_dot( rel, vup ) };
 266
 267          if( fabsf(xy[0]) <= gate->dims[0] && fabsf(xy[1]) <= gate->dims[1] )
 268          {
 269             return 1;
 270          }
 271       }
 272    }
 273
 274    return 0;
 275 }
 276
 277 #endif /* WORLD_GATE_H */