world_gate.h

   1 #ifndef WORLD_GATE_H
   2 #define WORLD_GATE_H
   3
   4 #define GATE_RENDER_PERFORMANCE
   5
   6 #include "common.h"
   7 #include "model.h"
   8 #include "render.h"
   9
  10 #ifndef GATE_RENDER_PERFORMANCE
  11   #include "shaders/gate.h"
  12 #else
  13   #include "shaders/gatelq.h"
  14 #endif
  15
  16 #include "world_water.h"
  17
  18
  19 typedef struct teleport_gate teleport_gate;
  20
  21 static struct
  22 {
  23    struct framebuffer fb;
  24    glmesh mdl;
  25 }
  26 grender =
  27 {
  28    .fb = {
  29       .format = GL_RGB,
  30       .div = 1
  31    }
  32 };
  33
  34 static void gate_transform_update( teleport_gate *gate )
  35 {
  36    m4x3f to_local;
  37
  38    q_m3x3( gate->q[0], gate->to_world );
  39    v3_copy( gate->co[0], gate->to_world[3] );
  40
  41    m4x3_invert_affine( gate->to_world, to_local );
  42
  43    q_m3x3( gate->q[1], gate->recv_to_world );
  44    v3_copy( gate->co[1], gate->recv_to_world[3] );
  45    m4x3_mul( gate->recv_to_world, to_local, gate->transport );
  46 }
  47
  48 static void world_gates_init(void)
  49 {
  50    vg_info( "world_gates_init\n" );
  51
  52 #ifndef GATE_RENDER_PERFORMANCE
  53    shader_gate_register();
  54 #else
  55    shader_gatelq_register();
  56 #endif
  57
  58    mdl_header *mgate = mdl_load( "models/rs_gate.mdl" );
  59
  60    vg_acquire_thread_sync();
  61    {
  62       fb_init( &grender.fb );
  63       mdl_unpack_glmesh( mgate, &grender.mdl );
  64    }
  65    vg_release_thread_sync();
  66 }
  67
  68 static void world_gates_free(void*_)
  69 {
  70    fb_free( &grender.fb );
  71 }
  72
  73 static void gate_fb_resize(void)
  74 {
  75    fb_resize( &grender.fb );
  76 }
  77
  78 static int render_gate( teleport_gate *gate, v3f viewpos, m4x3f camera )
  79 {
  80    v3f viewdir, gatedir;
  81    m3x3_mulv( camera, (v3f){0.0f,0.0f,-1.0f}, viewdir );
  82    m3x3_mulv( gate->to_world, (v3f){0.0f,0.0f,-1.0f}, gatedir );
  83
  84    v3f v0;
  85    v3_sub( viewpos, gate->co[0], v0 );
  86    if( v3_dot(v0, gatedir) >= 0.0f )
  87       return 0;
  88
  89    if( v3_dist( viewpos, gate->co[0] ) > 100.0f )
  90       return 0;
  91
  92    v3f a,b,c,d;
  93
  94    float sx = gate->dims[0],
  95          sy = gate->dims[1];
  96    m4x3_mulv( gate->to_world, (v3f){-sx,-sy,0.0f}, a );
  97    m4x3_mulv( gate->to_world, (v3f){ sx,-sy,0.0f}, b );
  98    m4x3_mulv( gate->to_world, (v3f){ sx, sy,0.0f}, c );
  99    m4x3_mulv( gate->to_world, (v3f){-sx, sy,0.0f}, d );
 100
 101    vg_line( a,b, 0xffffa000 );
 102    vg_line( b,c, 0xffffa000 );
 103    vg_line( c,d, 0xffffa000 );
 104    vg_line( d,a, 0xffffa000 );
 105
 106    vg_line2( gate->co[0], gate->co[1], 0xff0000ff, 0x00000000 );
 107
 108    m4x3f cam_new;
 109    m4x3_mul( gate->transport, camera, cam_new );
 110
 111    vg_line_pt3( cam_new[3], 0.3f, 0xff00ff00 );
 112
 113    m4x3f gate_xform;
 114    m4x3_copy( gate->to_world, gate_xform );
 115    m4x3_scalev( gate_xform, (v3f){ gate->dims[0], gate->dims[1], 1.0f } );
 116
 117    m4x3f inverse;
 118    m4x3_invert_affine( cam_new, inverse );
 119
 120    m4x4f view;
 121    m4x3_expand( inverse, view );
 122
 123    v4f surface;
 124    m3x3_mulv( gate->recv_to_world, (v3f){0.0f,0.0f,-1.0f}, surface );
 125    surface[3] = v3_dot( surface, gate->co[1] );
 126
 127    m4x4f projection;
 128    pipeline_projection( projection, 0.1f, 900.0f );
 129
 130    m4x3_mulp( inverse, surface, surface );
 131    surface[3] = -fabsf(surface[3]);
 132    plane_clip_projection( projection, surface );
 133
 134    m4x4_mul( projection, view, projection );
 135
 136 #ifndef GATE_RENDER_PERFORMANCE
 137       fb_use( &grender.fb );
 138       glClearColor( 0.11f, 0.35f, 0.37f, 1.0f );
 139       glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
 140 #else
 141       shader_gatelq_use();
 142       shader_gatelq_uPv( vg_pv );
 143       shader_gatelq_uMdl( gate_xform );
 144       shader_gatelq_uCam( viewpos );
 145       shader_gatelq_uTime( vg_time*0.25f );
 146       shader_gatelq_uInvRes( (v2f){
 147             1.0f / (float)vg_window_x,
 148             1.0f / (float)vg_window_y });
 149
 150       glEnable( GL_STENCIL_TEST );
 151       glStencilOp( GL_KEEP, GL_KEEP, GL_REPLACE );
 152       glStencilFunc( GL_ALWAYS, 1, 0xFF );
 153       glStencilMask( 0xFF );
 154
 155       mesh_bind( &grender.mdl );
 156       mesh_draw( &grender.mdl );
 157
 158       glClear( GL_DEPTH_BUFFER_BIT );
 159       glStencilFunc( GL_EQUAL, 1, 0xFF );
 160       glStencilMask( 0x00 );
 161 #endif
 162
 163    render_world( projection, cam_new );
 164
 165 #ifndef GATE_RENDER_PERFORMANCE
 166
 167       /*
 168        * NOTE: Need to find a way to draw a stencil buffer into the water
 169        *       rendering
 170        */
 171
 172       render_water_texture( cam_new );
 173       fb_use( &grender.fb );
 174
 175       render_water_surface( projection, cam_new );
 176       fb_use( NULL );
 177
 178       shader_gate_use();
 179
 180       shader_gate_uPv( vg_pv );
 181       shader_gate_uMdl( gate_xform );
 182
 183       fb_bindtex( &grender.fb, 0 );
 184
 185       shader_gate_uCam( viewpos );
 186       shader_gate_uTexMain( 0 );
 187       shader_gate_uTexWater( 1 );
 188       shader_gate_uTime( vg_time*0.25f );
 189       shader_gate_uInvRes( (v2f){
 190             1.0f / (float)vg_window_x,
 191             1.0f / (float)vg_window_y });
 192
 193       glEnable(GL_BLEND);
 194       glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 195       glBlendEquation(GL_FUNC_ADD);
 196
 197       mesh_bind( &grender.mdl );
 198       mesh_draw( &grender.mdl );
 199
 200       glDisable(GL_BLEND);
 201 #else
 202       glDisable( GL_STENCIL_TEST );
 203
 204       render_water_texture( cam_new );
 205       fb_use( NULL );
 206       glEnable( GL_STENCIL_TEST );
 207
 208       render_water_surface( projection, cam_new );
 209
 210       glStencilMask( 0xFF );
 211       glStencilFunc( GL_ALWAYS, 1, 0xFF );
 212       glDisable( GL_STENCIL_TEST );
 213 #endif
 214
 215    return 1;
 216 }
 217
 218 static int gate_intersect( teleport_gate *gate, v3f pos, v3f last )
 219 {
 220    v4f surface;
 221    m3x3_mulv( gate->to_world, (v3f){0.0f,0.0f,-1.0f}, surface );
 222    surface[3] = v3_dot( surface, gate->co[0] );
 223
 224    v3f v0, c, delta, p0;
 225    v3_sub( pos, last, v0 );
 226    float l = v3_length( v0 );
 227    v3_divs( v0, l, v0 );
 228
 229    v3_muls( surface, surface[3], c );
 230    v3_sub( c, last, delta );
 231
 232    float d = v3_dot(surface, v0);
 233
 234    if( d > 0.00001f )
 235    {
 236       float t = v3_dot(delta, surface) / d;
 237       if( t >= 0.0f && t <= l )
 238       {
 239          v3f local, rel;
 240          v3_muladds( last, v0, t, local );
 241          v3_sub( gate->co[0], local, rel );
 242
 243          v3f vup, vside;
 244          m3x3_mulv( gate->to_world, (v3f){0.0f,1.0f,0.0f}, vup );
 245          m3x3_mulv( gate->to_world, (v3f){1.0f,0.0f,0.0f}, vside );
 246
 247          v2f xy = { v3_dot( rel, vside ), v3_dot( rel, vup ) };
 248
 249          if( fabsf(xy[0]) <= gate->dims[0] && fabsf(xy[1]) <= gate->dims[1] )
 250          {
 251             return 1;
 252          }
 253       }
 254    }
 255
 256    return 0;
 257 }
 258
 259 #endif /* WORLD_GATE_H */