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    m3x3_scale( 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
  46    mdl_mesh *surface = mdl_find_mesh( &mgate, "rs_gate" );
  47    mdl_submesh *sm = mdl_arritm(&mgate.submeshs,surface->submesh_start);
  48    world_global.sm_gate_surface = *sm;
  49
  50    const char *names[] = { "rs_gate_marker", "rs_gate_marker.001",
  51                            "rs_gate_marker.002", "rs_gate_marker.003" };
  52
  53    for( int i=0; i<4; i++ ){
  54       mdl_mesh *marker = mdl_find_mesh( &mgate, names[i] );
  55       sm = mdl_arritm( &mgate.submeshs, marker->submesh_start );
  56       world_global.sm_gate_marker[i] = *sm;
  57    }
  58
  59    mdl_async_load_glmesh( &mgate, &world_global.mesh_gate );
  60    mdl_close( &mgate );
  61 }
  62
  63 VG_STATIC int render_gate( world_instance *world_inside,
  64                            ent_gate *gate, camera *cam, int layer_depth )
  65 {
  66    v3f viewdir, gatedir;
  67    m3x3_mulv( cam->transform, (v3f){0.0f,0.0f,-1.0f}, viewdir );
  68    q_mulv( gate->q[0], (v3f){0.0f,0.0f,-1.0f}, gatedir );
  69
  70    v3f v0;
  71    v3_sub( cam->pos, gate->co[0], v0 );
  72
  73    float dist = v3_dot(v0, gatedir);
  74
  75    /* Hard cutoff */
  76    if( dist > 3.0f )
  77       return 0;
  78
  79    if( v3_dist( cam->pos, gate->co[0] ) > 100.0f )
  80       return 0;
  81
  82    {
  83       v3f a,b,c,d;
  84
  85       m4x3_mulv( gate->to_world, (v3f){-1.0f,-1.0f,0.0f}, a );
  86       m4x3_mulv( gate->to_world, (v3f){ 1.0f,-1.0f,0.0f}, b );
  87       m4x3_mulv( gate->to_world, (v3f){ 1.0f, 1.0f,0.0f}, c );
  88       m4x3_mulv( gate->to_world, (v3f){-1.0f, 1.0f,0.0f}, d );
  89
  90       vg_line( a,b, 0xffffa000 );
  91       vg_line( b,c, 0xffffa000 );
  92       vg_line( c,d, 0xffffa000 );
  93       vg_line( d,a, 0xffffa000 );
  94
  95       vg_line2( gate->co[0], gate->co[1], 0xff0000ff, 0x00000000 );
  96    }
  97
  98    /* update gate camera */
  99    gate_camera.fov = cam->fov;
 100    gate_camera.nearz = 0.1f;
 101    gate_camera.farz  = 2000.0f;
 102
 103    m4x3_mul( gate->transport, cam->transform, gate_camera.transform );
 104    camera_update_view( &gate_camera );
 105    camera_update_projection( &gate_camera );
 106
 107    /* Add special clipping plane to projection */
 108    v4f surface;
 109    q_mulv( gate->q[1], (v3f){0.0f,0.0f,-1.0f}, surface );
 110    surface[3] = v3_dot( surface, gate->co[1] );
 111
 112    m4x3_mulp( gate_camera.transform_inverse, surface, surface );
 113    surface[3] = -fabsf(surface[3]);
 114
 115    if( dist < -0.5f )
 116       m4x4_clip_projection( gate_camera.mtx.p, surface );
 117
 118    /* Ready to draw with new camrea */
 119    camera_finalize( &gate_camera );
 120
 121    vg_line_pt3( gate_camera.transform[3], 0.3f, 0xff00ff00 );
 122    {
 123       shader_model_gate_use();
 124       shader_model_gate_uPv( cam->mtx.pv );
 125       shader_model_gate_uMdl( gate->to_world );
 126       shader_model_gate_uCam( cam->pos );
 127       shader_model_gate_uColour( (v4f){0.0f,1.0f,0.0f,0.0f} );
 128       shader_model_gate_uTime( vg.time*0.25f );
 129       shader_model_gate_uInvRes( (v2f){
 130             1.0f / (float)vg.window_x,
 131             1.0f / (float)vg.window_y });
 132
 133       glEnable( GL_STENCIL_TEST );
 134       glStencilOp( GL_KEEP, GL_KEEP, GL_REPLACE );
 135       glStencilFunc( GL_ALWAYS, 1, 0xFF );
 136       glStencilMask( 0xFF );
 137
 138       mesh_bind( &world_global.mesh_gate );
 139       mdl_draw_submesh( &world_global.sm_gate_surface );
 140
 141       glClear( GL_DEPTH_BUFFER_BIT );
 142       glStencilFunc( GL_EQUAL, 1, 0xFF );
 143       glStencilMask( 0x00 );
 144    }
 145
 146    render_world( world_inside, &gate_camera, layer_depth );
 147
 148    {
 149       glDisable( GL_STENCIL_TEST );
 150
 151       render_water_texture( world_inside, &gate_camera, layer_depth );
 152       render_fb_bind( gpipeline.fb_main, 1 );
 153
 154       glEnable( GL_STENCIL_TEST );
 155
 156       render_water_surface( world_inside, &gate_camera );
 157
 158       glStencilMask( 0xFF );
 159       glStencilFunc( GL_ALWAYS, 1, 0xFF );
 160       glDisable( GL_STENCIL_TEST );
 161    }
 162
 163    return 1;
 164 }
 165
 166 VG_STATIC int gate_intersect_plane( ent_gate *gate,
 167                                     v3f pos, v3f last, v2f where )
 168 {
 169    v4f surface;
 170    q_mulv( gate->q[0], (v3f){0.0f,0.0f,-1.0f}, surface );
 171    surface[3] = v3_dot( surface, gate->co[0] );
 172
 173    v3f v0, c, delta, p0;
 174    v3_sub( pos, last, v0 );
 175    float l = v3_length( v0 );
 176
 177    if( l == 0.0f )
 178       return 0;
 179
 180    v3_divs( v0, l, v0 );
 181
 182    v3_muls( surface, surface[3], c );
 183    v3_sub( c, last, delta );
 184
 185    float d = v3_dot( surface, v0 );
 186
 187    if( d > 0.00001f ){
 188       float t = v3_dot(delta, surface) / d;
 189       if( t >= 0.0f && t <= l ){
 190          v3f local, rel;
 191          v3_muladds( last, v0, t, local );
 192          v3_sub( gate->co[0], local, rel );
 193
 194          where[0] = v3_dot( rel, gate->to_world[0] );
 195          where[1] = v3_dot( rel, gate->to_world[1] );
 196
 197          where[0] /= v3_dot( gate->to_world[0], gate->to_world[0] );
 198          where[1] /= v3_dot( gate->to_world[1], gate->to_world[1] );
 199
 200          return 1;
 201       }
 202    }
 203
 204    return 0;
 205 }
 206
 207 VG_STATIC int gate_intersect( ent_gate *gate, v3f pos, v3f last )
 208 {
 209    v2f xy;
 210
 211    if( gate_intersect_plane( gate, pos, last, xy ) ){
 212       if( fabsf(xy[0]) <= 1.0f && fabsf(xy[1]) <= 1.0f ){
 213          return 1;
 214       }
 215    }
 216
 217    return 0;
 218 }
 219
 220 /*
 221  * Intersect all gates in the world
 222  */
 223 VG_STATIC ent_gate *world_intersect_gates( world_instance *world,
 224                                            v3f pos, v3f last )
 225 {
 226    for( u32 i=0; i<mdl_arrcount(&world->ent_gate); i++ ){
 227       ent_gate *gate = mdl_arritm( &world->ent_gate, i );
 228       if( gate->type == k_gate_type_unlinked ||
 229           gate->type == k_gate_type_nonlocal_unlinked )
 230          continue;
 231
 232       if( gate_intersect( gate, pos, last ) ){
 233          return gate;
 234       }
 235    }
 236
 237    return NULL;
 238 }
 239
 240 #endif /* WORLD_GATE_H */