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 "common.h"
   9 #include "model.h"
  10 #include "entity.h"
  11 #include "render.h"
  12 #include "camera.h"
  13
  14 #include "shaders/model_gate.h"
  15 #include "world_water.h"
  16
  17 VG_STATIC void gate_transform_update( ent_gate *gate )
  18 {
  19    m4x3f to_local, recv_to_world;
  20
  21    q_m3x3( gate->q[0], gate->to_world );
  22    v3_copy( gate->co[0], gate->to_world[3] );
  23
  24    m4x3_invert_affine( gate->to_world, to_local );
  25
  26    q_m3x3( gate->q[1], recv_to_world );
  27    v3_copy( gate->co[1], recv_to_world[3] );
  28    m4x3_mul( recv_to_world, to_local, gate->transport );
  29
  30    m4x3_scalev( gate->to_world, (v3f){ gate->dimensions[0],
  31                                        gate->dimensions[1], 1.0f } );
  32 }
  33
  34 VG_STATIC void world_gates_init(void)
  35 {
  36    vg_info( "world_gates_init\n" );
  37
  38    shader_model_gate_register();
  39
  40    vg_linear_clear( vg_mem.scratch );
  41
  42    mdl_context mgate;
  43    mdl_open( &mgate, "models/rs_gate.mdl", vg_mem.scratch );
  44    mdl_load_metadata_block( &mgate, vg_mem.scratch );
  45    mdl_load_mesh_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_close( &mgate );
  61
  62    vg_acquire_thread_sync();
  63    {
  64       mdl_unpack_glmesh( &mgate, &world_global.mesh_gate );
  65    }
  66    vg_release_thread_sync();
  67 }
  68
  69 VG_STATIC int render_gate( world_instance *world_inside,
  70                            ent_gate *gate, camera *cam, int layer_depth )
  71 {
  72    v3f viewdir, gatedir;
  73    m3x3_mulv( cam->transform, (v3f){0.0f,0.0f,-1.0f}, viewdir );
  74    q_mulv( gate->q[0], (v3f){0.0f,0.0f,-1.0f}, gatedir );
  75
  76    v3f v0;
  77    v3_sub( cam->pos, gate->co[0], v0 );
  78
  79    float dist = v3_dot(v0, gatedir);
  80
  81    /* Hard cutoff */
  82    if( dist > 3.0f )
  83       return 0;
  84
  85    if( v3_dist( cam->pos, gate->co[0] ) > 100.0f )
  86       return 0;
  87
  88    {
  89       v3f a,b,c,d;
  90
  91       m4x3_mulv( gate->to_world, (v3f){-1.0f,-1.0f,0.0f}, a );
  92       m4x3_mulv( gate->to_world, (v3f){ 1.0f,-1.0f,0.0f}, b );
  93       m4x3_mulv( gate->to_world, (v3f){ 1.0f, 1.0f,0.0f}, c );
  94       m4x3_mulv( gate->to_world, (v3f){-1.0f, 1.0f,0.0f}, d );
  95
  96       vg_line( a,b, 0xffffa000 );
  97       vg_line( b,c, 0xffffa000 );
  98       vg_line( c,d, 0xffffa000 );
  99       vg_line( d,a, 0xffffa000 );
 100
 101       vg_line2( gate->co[0], gate->co[1], 0xff0000ff, 0x00000000 );
 102    }
 103
 104    /* update gate camera */
 105    gate_camera.fov = cam->fov;
 106    gate_camera.nearz = 0.1f;
 107    gate_camera.farz  = 2000.0f;
 108
 109    m4x3_mul( gate->transport, cam->transform, gate_camera.transform );
 110    camera_update_view( &gate_camera );
 111    camera_update_projection( &gate_camera );
 112
 113    /* Add special clipping plane to projection */
 114    v4f surface;
 115    q_mulv( gate->q[1], (v3f){0.0f,0.0f,-1.0f}, surface );
 116    surface[3] = v3_dot( surface, gate->co[1] );
 117
 118    m4x3_mulp( gate_camera.transform_inverse, surface, surface );
 119    surface[3] = -fabsf(surface[3]);
 120
 121    if( dist < -0.5f )
 122       m4x4_clip_projection( gate_camera.mtx.p, surface );
 123
 124    /* Ready to draw with new camrea */
 125    camera_finalize( &gate_camera );
 126
 127    vg_line_pt3( gate_camera.transform[3], 0.3f, 0xff00ff00 );
 128    {
 129       shader_model_gate_use();
 130       shader_model_gate_uPv( cam->mtx.pv );
 131       shader_model_gate_uMdl( gate->to_world );
 132       shader_model_gate_uCam( cam->pos );
 133
 134       /* TODO(ART IMPROVEMENT): animate alpha of this? */
 135       shader_model_gate_uColour( (v4f){0.0f,1.0f,0.0f,0.0f} );
 136       shader_model_gate_uTime( vg.time*0.25f );
 137       shader_model_gate_uInvRes( (v2f){
 138             1.0f / (float)vg.window_x,
 139             1.0f / (float)vg.window_y });
 140
 141       glEnable( GL_STENCIL_TEST );
 142       glStencilOp( GL_KEEP, GL_KEEP, GL_REPLACE );
 143       glStencilFunc( GL_ALWAYS, 1, 0xFF );
 144       glStencilMask( 0xFF );
 145
 146       mesh_bind( &world_global.mesh_gate );
 147       mdl_draw_submesh( &world_global.sm_gate_surface );
 148
 149       glClear( GL_DEPTH_BUFFER_BIT );
 150       glStencilFunc( GL_EQUAL, 1, 0xFF );
 151       glStencilMask( 0x00 );
 152    }
 153
 154    render_world( world_inside, &gate_camera, layer_depth );
 155
 156    {
 157       glDisable( GL_STENCIL_TEST );
 158
 159       render_water_texture( world_inside, &gate_camera, layer_depth );
 160       render_fb_bind( gpipeline.fb_main );
 161
 162       glEnable( GL_STENCIL_TEST );
 163
 164       render_water_surface( world_inside, &gate_camera );
 165
 166       glStencilMask( 0xFF );
 167       glStencilFunc( GL_ALWAYS, 1, 0xFF );
 168       glDisable( GL_STENCIL_TEST );
 169    }
 170
 171    return 1;
 172 }
 173
 174 VG_STATIC int gate_intersect_plane( ent_gate *gate,
 175                                     v3f pos, v3f last, v2f where )
 176 {
 177    v4f surface;
 178    q_mulv( gate->q[0], (v3f){0.0f,0.0f,-1.0f}, surface );
 179    surface[3] = v3_dot( surface, gate->co[0] );
 180
 181    v3f v0, c, delta, p0;
 182    v3_sub( pos, last, v0 );
 183    float l = v3_length( v0 );
 184
 185    if( l == 0.0f )
 186       return 0;
 187
 188    v3_divs( v0, l, v0 );
 189
 190    v3_muls( surface, surface[3], c );
 191    v3_sub( c, last, delta );
 192
 193    float d = v3_dot( surface, v0 );
 194
 195    if( d > 0.00001f ){
 196       float t = v3_dot(delta, surface) / d;
 197       if( t >= 0.0f && t <= l ){
 198          v3f local, rel;
 199          v3_muladds( last, v0, t, local );
 200          v3_sub( gate->co[0], local, rel );
 201
 202          where[0] = v3_dot( rel, gate->to_world[0] );
 203          where[1] = v3_dot( rel, gate->to_world[1] );
 204
 205          where[0] /= v3_dot( gate->to_world[0], gate->to_world[0] );
 206          where[1] /= v3_dot( gate->to_world[1], gate->to_world[1] );
 207
 208          return 1;
 209       }
 210    }
 211
 212    return 0;
 213 }
 214
 215 VG_STATIC int gate_intersect( ent_gate *gate, v3f pos, v3f last )
 216 {
 217    v2f xy;
 218
 219    if( gate_intersect_plane( gate, pos, last, xy ) ){
 220       if( fabsf(xy[0]) <= 1.0f && fabsf(xy[1]) <= 1.0f ){
 221          return 1;
 222       }
 223    }
 224
 225    return 0;
 226 }
 227
 228 /*
 229  * Intersect all gates in the world
 230  */
 231 VG_STATIC ent_gate *world_intersect_gates( world_instance *world,
 232                                            v3f pos, v3f last )
 233 {
 234    for( u32 i=0; i<mdl_arrcount(&world->ent_gate); i++ ){
 235       ent_gate *gate = mdl_arritm( &world->ent_gate, i );
 236       if( gate->type == k_gate_type_unlinked )
 237          continue;
 238
 239       if( gate_intersect( gate, pos, last ) ){
 240          return gate;
 241       }
 242    }
 243
 244    return NULL;
 245 }
 246
 247 #endif /* WORLD_GATE_H */