world_gate.h

   1 /*
   2  * Copyright (C) 2021-2022 Mt.ZERO Software, Harry Godden - All Rights Reserved
   3  */
   4
   5 #ifndef WORLD_GATE_H
   6 #define WORLD_GATE_H
   7
   8 #include "skaterift.h"
   9 #include "common.h"
  10 #include "model.h"
  11 #include "entity.h"
  12 #include "render.h"
  13 #include "camera.h"
  14
  15 #include "shaders/model_gate.h"
  16 #include "world_water.h"
  17
  18 VG_STATIC void gate_transform_update( ent_gate *gate )
  19 {
  20    m4x3f to_local, recv_to_world;
  21
  22    q_m3x3( gate->q[0], gate->to_world );
  23    v3_copy( gate->co[0], gate->to_world[3] );
  24
  25    m4x3_invert_affine( gate->to_world, to_local );
  26
  27    q_m3x3( gate->q[1], recv_to_world );
  28    v3_copy( gate->co[1], recv_to_world[3] );
  29    m4x3_mul( recv_to_world, to_local, gate->transport );
  30
  31    m3x3_scale( gate->to_world, (v3f){ gate->dimensions[0],
  32                                       gate->dimensions[1], 1.0f } );
  33 }
  34
  35 VG_STATIC void world_gates_init(void)
  36 {
  37    vg_info( "world_gates_init\n" );
  38
  39    shader_model_gate_register();
  40
  41    vg_linear_clear( vg_mem.scratch );
  42
  43    mdl_context mgate;
  44    mdl_open( &mgate, "models/rs_gate.mdl", vg_mem.scratch );
  45    mdl_load_metadata_block( &mgate, vg_mem.scratch );
  46
  47    mdl_mesh *surface = mdl_find_mesh( &mgate, "rs_gate" );
  48    mdl_submesh *sm = mdl_arritm(&mgate.submeshs,surface->submesh_start);
  49    world_global.sm_gate_surface = *sm;
  50
  51    const char *names[] = { "rs_gate_marker", "rs_gate_marker.001",
  52                            "rs_gate_marker.002", "rs_gate_marker.003" };
  53
  54    for( int i=0; i<4; i++ ){
  55       mdl_mesh *marker = mdl_find_mesh( &mgate, names[i] );
  56       sm = mdl_arritm( &mgate.submeshs, marker->submesh_start );
  57       world_global.sm_gate_marker[i] = *sm;
  58    }
  59
  60    mdl_async_load_glmesh( &mgate, &world_global.mesh_gate );
  61    mdl_close( &mgate );
  62 }
  63
  64 VG_STATIC int render_gate( world_instance *world_inside,
  65                            ent_gate *gate, camera *cam, int layer_depth )
  66 {
  67    v3f viewdir, gatedir;
  68    m3x3_mulv( cam->transform, (v3f){0.0f,0.0f,-1.0f}, viewdir );
  69    q_mulv( gate->q[0], (v3f){0.0f,0.0f,-1.0f}, gatedir );
  70
  71    v3f v0;
  72    v3_sub( cam->pos, gate->co[0], v0 );
  73
  74    float dist = v3_dot(v0, gatedir);
  75
  76    /* Hard cutoff */
  77    if( dist > 3.0f )
  78       return 0;
  79
  80    if( v3_dist( cam->pos, gate->co[0] ) > 100.0f )
  81       return 0;
  82
  83    {
  84       v3f a,b,c,d;
  85
  86       m4x3_mulv( gate->to_world, (v3f){-1.0f,-1.0f,0.0f}, a );
  87       m4x3_mulv( gate->to_world, (v3f){ 1.0f,-1.0f,0.0f}, b );
  88       m4x3_mulv( gate->to_world, (v3f){ 1.0f, 1.0f,0.0f}, c );
  89       m4x3_mulv( gate->to_world, (v3f){-1.0f, 1.0f,0.0f}, d );
  90
  91       vg_line( a,b, 0xffffa000 );
  92       vg_line( b,c, 0xffffa000 );
  93       vg_line( c,d, 0xffffa000 );
  94       vg_line( d,a, 0xffffa000 );
  95
  96       vg_line2( gate->co[0], gate->co[1], 0xff0000ff, 0x00000000 );
  97    }
  98
  99    /* update gate camera */
 100    gate_camera.fov = cam->fov;
 101    gate_camera.nearz = 0.1f;
 102    gate_camera.farz  = 2000.0f;
 103
 104    m4x3_mul( gate->transport, cam->transform, gate_camera.transform );
 105    camera_update_view( &gate_camera );
 106    camera_update_projection( &gate_camera );
 107
 108    /* Add special clipping plane to projection */
 109    v4f surface;
 110    q_mulv( gate->q[1], (v3f){0.0f,0.0f,-1.0f}, surface );
 111    surface[3] = v3_dot( surface, gate->co[1] );
 112
 113    m4x3_mulp( gate_camera.transform_inverse, surface, surface );
 114    surface[3] = -fabsf(surface[3]);
 115
 116    if( dist < -0.5f )
 117       m4x4_clip_projection( gate_camera.mtx.p, surface );
 118
 119    /* Ready to draw with new camrea */
 120    camera_finalize( &gate_camera );
 121
 122    vg_line_pt3( gate_camera.transform[3], 0.3f, 0xff00ff00 );
 123    {
 124       shader_model_gate_use();
 125       shader_model_gate_uPv( cam->mtx.pv );
 126       shader_model_gate_uMdl( gate->to_world );
 127       shader_model_gate_uCam( cam->pos );
 128       shader_model_gate_uColour( (v4f){0.0f,1.0f,0.0f,0.0f} );
 129       shader_model_gate_uTime( vg.time*0.25f );
 130       shader_model_gate_uInvRes( (v2f){
 131             1.0f / (float)vg.window_x,
 132             1.0f / (float)vg.window_y });
 133
 134       glEnable( GL_STENCIL_TEST );
 135       glStencilOp( GL_KEEP, GL_KEEP, GL_REPLACE );
 136       glStencilFunc( GL_ALWAYS, 1, 0xFF );
 137       glStencilMask( 0xFF );
 138
 139       mesh_bind( &world_global.mesh_gate );
 140       mdl_draw_submesh( &world_global.sm_gate_surface );
 141
 142       glClear( GL_DEPTH_BUFFER_BIT );
 143       glStencilFunc( GL_EQUAL, 1, 0xFF );
 144       glStencilMask( 0x00 );
 145    }
 146
 147    render_world( world_inside, &gate_camera, layer_depth );
 148
 149    {
 150       glDisable( GL_STENCIL_TEST );
 151
 152       render_water_texture( world_inside, &gate_camera, layer_depth );
 153       render_fb_bind( gpipeline.fb_main, 1 );
 154
 155       glEnable( GL_STENCIL_TEST );
 156
 157       render_water_surface( world_inside, &gate_camera );
 158
 159       glStencilMask( 0xFF );
 160       glStencilFunc( GL_ALWAYS, 1, 0xFF );
 161       glDisable( GL_STENCIL_TEST );
 162    }
 163
 164    return 1;
 165 }
 166
 167 VG_STATIC int gate_intersect_plane( ent_gate *gate,
 168                                     v3f pos, v3f last, v2f where )
 169 {
 170    v4f surface;
 171    q_mulv( gate->q[0], (v3f){0.0f,0.0f,-1.0f}, surface );
 172    surface[3] = v3_dot( surface, gate->co[0] );
 173
 174    v3f v0, c, delta, p0;
 175    v3_sub( pos, last, v0 );
 176    float l = v3_length( v0 );
 177
 178    if( l == 0.0f )
 179       return 0;
 180
 181    v3_divs( v0, l, v0 );
 182
 183    v3_muls( surface, surface[3], c );
 184    v3_sub( c, last, delta );
 185
 186    float d = v3_dot( surface, v0 );
 187
 188    if( d > 0.00001f ){
 189       float t = v3_dot(delta, surface) / d;
 190       if( t >= 0.0f && t <= l ){
 191          v3f local, rel;
 192          v3_muladds( last, v0, t, local );
 193          v3_sub( gate->co[0], local, rel );
 194
 195          where[0] = v3_dot( rel, gate->to_world[0] );
 196          where[1] = v3_dot( rel, gate->to_world[1] );
 197
 198          where[0] /= v3_dot( gate->to_world[0], gate->to_world[0] );
 199          where[1] /= v3_dot( gate->to_world[1], gate->to_world[1] );
 200
 201          return 1;
 202       }
 203    }
 204
 205    return 0;
 206 }
 207
 208 VG_STATIC int gate_intersect( ent_gate *gate, v3f pos, v3f last )
 209 {
 210    v2f xy;
 211
 212    if( gate_intersect_plane( gate, pos, last, xy ) ){
 213       if( fabsf(xy[0]) <= 1.0f && fabsf(xy[1]) <= 1.0f ){
 214          return 1;
 215       }
 216    }
 217
 218    return 0;
 219 }
 220
 221 /*
 222  * Intersect all gates in the world
 223  */
 224 VG_STATIC ent_gate *world_intersect_gates( world_instance *world,
 225                                            v3f pos, v3f last )
 226 {
 227    for( u32 i=0; i<mdl_arrcount(&world->ent_gate); i++ ){
 228       ent_gate *gate = mdl_arritm( &world->ent_gate, i );
 229       if( gate->type == k_gate_type_unlinked ||
 230           gate->type == k_gate_type_nonlocal_unlinked )
 231          continue;
 232
 233       if( gate->type == k_gate_type_nonlocel ){
 234          if( skaterift.async_op == k_async_op_world_loading ||
 235              skaterift.async_op == k_async_op_world_preloading ){
 236             continue;
 237          }
 238       }
 239
 240       if( gate_intersect( gate, pos, last ) ){
 241          return gate;
 242       }
 243    }
 244
 245    return NULL;
 246 }
 247
 248 #endif /* WORLD_GATE_H */