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