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 void 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    vg_acquire_thread_sync();
  54    {
  55       fb_init( &grender.fb );
  56       mdl_unpack_glmesh( mgate, &grender.mdl );
  57    }
  58    vg_release_thread_sync();
  59 }
  60
  61 static void world_gates_free(void*_)
  62 {
  63    fb_free( &grender.fb );
  64 }
  65
  66 static void gate_fb_resize(void)
  67 {
  68    fb_resize( &grender.fb );
  69 }
  70
  71 static int render_gate( teleport_gate *gate, v3f viewpos, m4x3f camera )
  72 {
  73    v3f viewdir, gatedir;
  74    m3x3_mulv( camera, (v3f){0.0f,0.0f,-1.0f}, viewdir );
  75    m3x3_mulv( gate->to_world, (v3f){0.0f,0.0f,-1.0f}, gatedir );
  76
  77    v3f v0;
  78    v3_sub( viewpos, gate->co[0], v0 );
  79    if( v3_dot(v0, gatedir) >= 0.0f )
  80       return 0;
  81
  82    if( v3_dist( viewpos, gate->co[0] ) > 100.0f )
  83       return 0;
  84
  85    v3f a,b,c,d;
  86
  87    float sx = gate->dims[0],
  88          sy = gate->dims[1];
  89    m4x3_mulv( gate->to_world, (v3f){-sx,-sy,0.0f}, a );
  90    m4x3_mulv( gate->to_world, (v3f){ sx,-sy,0.0f}, b );
  91    m4x3_mulv( gate->to_world, (v3f){ sx, sy,0.0f}, c );
  92    m4x3_mulv( gate->to_world, (v3f){-sx, sy,0.0f}, d );
  93
  94    vg_line( a,b, 0xffffa000 );
  95    vg_line( b,c, 0xffffa000 );
  96    vg_line( c,d, 0xffffa000 );
  97    vg_line( d,a, 0xffffa000 );
  98
  99    vg_line2( gate->co[0], gate->co[1], 0xff0000ff, 0x00000000 );
 100
 101    m4x3f cam_new;
 102    m4x3_mul( gate->transport, camera, cam_new );
 103
 104    vg_line_pt3( cam_new[3], 0.3f, 0xff00ff00 );
 105
 106    m4x3f gate_xform;
 107    m4x3_copy( gate->to_world, gate_xform );
 108    m4x3_scalev( gate_xform, (v3f){ gate->dims[0], gate->dims[1], 1.0f } );
 109
 110    m4x3f inverse;
 111    m4x3_invert_affine( cam_new, inverse );
 112
 113    m4x4f view;
 114    m4x3_expand( inverse, view );
 115
 116    v4f surface;
 117    m3x3_mulv( gate->recv_to_world, (v3f){0.0f,0.0f,-1.0f}, surface );
 118    surface[3] = v3_dot( surface, gate->co[1] );
 119
 120    m4x4f projection;
 121    pipeline_projection( projection, 0.1f, 900.0f );
 122
 123    m4x3_mulp( inverse, surface, surface );
 124    surface[3] = -fabsf(surface[3]);
 125    plane_clip_projection( projection, surface );
 126
 127    m4x4_mul( projection, view, projection );
 128
 129    if( grender.high_qual )
 130    {
 131       fb_use( &grender.fb );
 132       glClearColor( 0.11f, 0.35f, 0.37f, 1.0f );
 133       glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
 134    }
 135    else
 136    {
 137       shader_gatelq_use();
 138       shader_gatelq_uPv( vg_pv );
 139       shader_gatelq_uMdl( gate_xform );
 140       shader_gatelq_uCam( viewpos );
 141       shader_gatelq_uTime( vg_time*0.25f );
 142       shader_gatelq_uInvRes( (v2f){
 143             1.0f / (float)vg_window_x,
 144             1.0f / (float)vg_window_y });
 145
 146       glEnable( GL_STENCIL_TEST );
 147       glStencilOp( GL_KEEP, GL_KEEP, GL_REPLACE );
 148       glStencilFunc( GL_ALWAYS, 1, 0xFF );
 149       glStencilMask( 0xFF );
 150
 151       mesh_bind( &grender.mdl );
 152       mesh_draw( &grender.mdl );
 153
 154       glClear( GL_DEPTH_BUFFER_BIT );
 155       glStencilFunc( GL_EQUAL, 1, 0xFF );
 156       glStencilMask( 0x00 );
 157    }
 158
 159    render_world( projection, cam_new );
 160
 161    if( grender.high_qual )
 162    {
 163       /*
 164        * TODO: Need to find a way to draw a stencil buffer into the water
 165        *       rendering
 166        */
 167
 168       render_water_texture( cam_new );
 169       fb_use( &grender.fb );
 170
 171       render_water_surface( projection, cam_new );
 172       fb_use( NULL );
 173
 174       shader_gate_use();
 175
 176       shader_gate_uPv( vg_pv );
 177       shader_gate_uMdl( gate_xform );
 178
 179       fb_bindtex( &grender.fb, 0 );
 180
 181       shader_gate_uCam( viewpos );
 182       shader_gate_uTexMain( 0 );
 183       shader_gate_uTexWater( 1 );
 184       shader_gate_uTime( vg_time*0.25f );
 185       shader_gate_uInvRes( (v2f){
 186             1.0f / (float)vg_window_x,
 187             1.0f / (float)vg_window_y });
 188
 189       glEnable(GL_BLEND);
 190       glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 191       glBlendEquation(GL_FUNC_ADD);
 192
 193       mesh_bind( &grender.mdl );
 194       mesh_draw( &grender.mdl );
 195
 196       glDisable(GL_BLEND);
 197    }
 198    else
 199    {
 200       glDisable( GL_STENCIL_TEST );
 201
 202       render_water_texture( cam_new );
 203       fb_use( NULL );
 204       glEnable( GL_STENCIL_TEST );
 205
 206       render_water_surface( projection, cam_new );
 207
 208       glStencilMask( 0xFF );
 209       glStencilFunc( GL_ALWAYS, 1, 0xFF );
 210       glDisable( GL_STENCIL_TEST );
 211    }
 212
 213    return 1;
 214 }
 215
 216 static int gate_intersect( teleport_gate *gate, v3f pos, v3f last )
 217 {
 218    v4f surface;
 219    m3x3_mulv( gate->to_world, (v3f){0.0f,0.0f,-1.0f}, surface );
 220    surface[3] = v3_dot( surface, gate->co[0] );
 221
 222    v3f v0, c, delta, p0;
 223    v3_sub( pos, last, v0 );
 224    float l = v3_length( v0 );
 225    v3_divs( v0, l, v0 );
 226
 227    v3_muls( surface, surface[3], c );
 228    v3_sub( c, last, delta );
 229
 230    float d = v3_dot(surface, v0);
 231
 232    if( d > 0.00001f )
 233    {
 234       float t = v3_dot(delta, surface) / d;
 235       if( t >= 0.0f && t <= l )
 236       {
 237          v3f local, rel;
 238          v3_muladds( last, v0, t, local );
 239          v3_sub( gate->co[0], local, rel );
 240
 241          v3f vup, vside;
 242          m3x3_mulv( gate->to_world, (v3f){0.0f,1.0f,0.0f}, vup );
 243          m3x3_mulv( gate->to_world, (v3f){1.0f,0.0f,0.0f}, vside );
 244
 245          v2f xy = { v3_dot( rel, vside ), v3_dot( rel, vup ) };
 246
 247          if( fabsf(xy[0]) <= gate->dims[0] && fabsf(xy[1]) <= gate->dims[1] )
 248          {
 249             return 1;
 250          }
 251       }
 252    }
 253
 254    return 0;
 255 }
 256
 257 #endif /* WORLD_GATE_H */