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 #define GATE_RENDER_PERFORMANCE
   9
  10 #include "common.h"
  11 #include "model.h"
  12 #include "render.h"
  13
  14 #ifndef GATE_RENDER_PERFORMANCE
  15   #include "shaders/gate.h"
  16 #else
  17   #include "shaders/gatelq.h"
  18 #endif
  19
  20 #include "world_water.h"
  21
  22
  23 typedef struct teleport_gate teleport_gate;
  24
  25 static struct
  26 {
  27    struct framebuffer fb;
  28    glmesh mdl;
  29 }
  30 grender =
  31 {
  32    .fb = {
  33       .format = GL_RGB,
  34       .div = 1
  35    }
  36 };
  37
  38 static void gate_transform_update( teleport_gate *gate )
  39 {
  40    m4x3f to_local;
  41
  42    q_m3x3( gate->q[0], gate->to_world );
  43    v3_copy( gate->co[0], gate->to_world[3] );
  44
  45    m4x3_invert_affine( gate->to_world, to_local );
  46
  47    q_m3x3( gate->q[1], gate->recv_to_world );
  48    v3_copy( gate->co[1], gate->recv_to_world[3] );
  49    m4x3_mul( gate->recv_to_world, to_local, gate->transport );
  50 }
  51
  52 static void world_gates_init(void)
  53 {
  54    vg_info( "world_gates_init\n" );
  55
  56 #ifndef GATE_RENDER_PERFORMANCE
  57    shader_gate_register();
  58 #else
  59    shader_gatelq_register();
  60 #endif
  61
  62    mdl_header *mgate = mdl_load( "models/rs_gate.mdl" );
  63
  64    vg_acquire_thread_sync();
  65    {
  66       fb_init( &grender.fb );
  67       mdl_unpack_glmesh( mgate, &grender.mdl );
  68    }
  69    vg_release_thread_sync();
  70 }
  71
  72 static void world_gates_free(void*_)
  73 {
  74    fb_free( &grender.fb );
  75 }
  76
  77 static void gate_fb_resize(void)
  78 {
  79    fb_resize( &grender.fb );
  80 }
  81
  82 static int render_gate( teleport_gate *gate, v3f viewpos, m4x3f camera )
  83 {
  84    v3f viewdir, gatedir;
  85    m3x3_mulv( camera, (v3f){0.0f,0.0f,-1.0f}, viewdir );
  86    m3x3_mulv( gate->to_world, (v3f){0.0f,0.0f,-1.0f}, gatedir );
  87
  88    v3f v0;
  89    v3_sub( viewpos, gate->co[0], v0 );
  90    if( v3_dot(v0, gatedir) >= 0.0f )
  91       return 0;
  92
  93    if( v3_dist( viewpos, gate->co[0] ) > 100.0f )
  94       return 0;
  95
  96    v3f a,b,c,d;
  97
  98    float sx = gate->dims[0],
  99          sy = gate->dims[1];
 100    m4x3_mulv( gate->to_world, (v3f){-sx,-sy,0.0f}, a );
 101    m4x3_mulv( gate->to_world, (v3f){ sx,-sy,0.0f}, b );
 102    m4x3_mulv( gate->to_world, (v3f){ sx, sy,0.0f}, c );
 103    m4x3_mulv( gate->to_world, (v3f){-sx, sy,0.0f}, d );
 104
 105    vg_line( a,b, 0xffffa000 );
 106    vg_line( b,c, 0xffffa000 );
 107    vg_line( c,d, 0xffffa000 );
 108    vg_line( d,a, 0xffffa000 );
 109
 110    vg_line2( gate->co[0], gate->co[1], 0xff0000ff, 0x00000000 );
 111
 112    m4x3f cam_new;
 113    m4x3_mul( gate->transport, camera, cam_new );
 114
 115    vg_line_pt3( cam_new[3], 0.3f, 0xff00ff00 );
 116
 117    m4x3f gate_xform;
 118    m4x3_copy( gate->to_world, gate_xform );
 119    m4x3_scalev( gate_xform, (v3f){ gate->dims[0], gate->dims[1], 1.0f } );
 120
 121    m4x3f inverse;
 122    m4x3_invert_affine( cam_new, inverse );
 123
 124    m4x4f view;
 125    m4x3_expand( inverse, view );
 126
 127    v4f surface;
 128    m3x3_mulv( gate->recv_to_world, (v3f){0.0f,0.0f,-1.0f}, surface );
 129    surface[3] = v3_dot( surface, gate->co[1] );
 130
 131    m4x4f projection;
 132    pipeline_projection( projection, 0.1f, 900.0f );
 133
 134    m4x3_mulp( inverse, surface, surface );
 135    surface[3] = -fabsf(surface[3]);
 136    plane_clip_projection( projection, surface );
 137
 138    m4x4_mul( projection, view, projection );
 139
 140 #ifndef GATE_RENDER_PERFORMANCE
 141       fb_use( &grender.fb );
 142       glClearColor( 0.11f, 0.35f, 0.37f, 1.0f );
 143       glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
 144 #else
 145       shader_gatelq_use();
 146       shader_gatelq_uPv( vg.pv );
 147       shader_gatelq_uMdl( gate_xform );
 148       shader_gatelq_uCam( viewpos );
 149       shader_gatelq_uTime( vg.time*0.25f );
 150       shader_gatelq_uInvRes( (v2f){
 151             1.0f / (float)vg.window_x,
 152             1.0f / (float)vg.window_y });
 153
 154       glEnable( GL_STENCIL_TEST );
 155       glStencilOp( GL_KEEP, GL_KEEP, GL_REPLACE );
 156       glStencilFunc( GL_ALWAYS, 1, 0xFF );
 157       glStencilMask( 0xFF );
 158
 159       mesh_bind( &grender.mdl );
 160       mesh_draw( &grender.mdl );
 161
 162       glClear( GL_DEPTH_BUFFER_BIT );
 163       glStencilFunc( GL_EQUAL, 1, 0xFF );
 164       glStencilMask( 0x00 );
 165 #endif
 166
 167    render_world( projection, cam_new );
 168
 169 #ifndef GATE_RENDER_PERFORMANCE
 170
 171       /*
 172        * NOTE: Need to find a way to draw a stencil buffer into the water
 173        *       rendering
 174        */
 175
 176       render_water_texture( cam_new );
 177       fb_use( &grender.fb );
 178
 179       render_water_surface( projection, cam_new );
 180       fb_use( NULL );
 181
 182       shader_gate_use();
 183
 184       shader_gate_uPv( vg_pv );
 185       shader_gate_uMdl( gate_xform );
 186
 187       fb_bindtex( &grender.fb, 0 );
 188
 189       shader_gate_uCam( viewpos );
 190       shader_gate_uTexMain( 0 );
 191       shader_gate_uTexWater( 1 );
 192       shader_gate_uTime( vg_time*0.25f );
 193       shader_gate_uInvRes( (v2f){
 194             1.0f / (float)vg_window_x,
 195             1.0f / (float)vg_window_y });
 196
 197       glEnable(GL_BLEND);
 198       glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 199       glBlendEquation(GL_FUNC_ADD);
 200
 201       mesh_bind( &grender.mdl );
 202       mesh_draw( &grender.mdl );
 203
 204       glDisable(GL_BLEND);
 205 #else
 206       glDisable( GL_STENCIL_TEST );
 207
 208       render_water_texture( cam_new );
 209       fb_use( NULL );
 210       glEnable( GL_STENCIL_TEST );
 211
 212       render_water_surface( projection, cam_new );
 213
 214       glStencilMask( 0xFF );
 215       glStencilFunc( GL_ALWAYS, 1, 0xFF );
 216       glDisable( GL_STENCIL_TEST );
 217 #endif
 218
 219    return 1;
 220 }
 221
 222 static int gate_intersect( teleport_gate *gate, v3f pos, v3f last )
 223 {
 224    v4f surface;
 225    m3x3_mulv( gate->to_world, (v3f){0.0f,0.0f,-1.0f}, surface );
 226    surface[3] = v3_dot( surface, gate->co[0] );
 227
 228    v3f v0, c, delta, p0;
 229    v3_sub( pos, last, v0 );
 230    float l = v3_length( v0 );
 231    v3_divs( v0, l, v0 );
 232
 233    v3_muls( surface, surface[3], c );
 234    v3_sub( c, last, delta );
 235
 236    float d = v3_dot(surface, v0);
 237
 238    if( d > 0.00001f )
 239    {
 240       float t = v3_dot(delta, surface) / d;
 241       if( t >= 0.0f && t <= l )
 242       {
 243          v3f local, rel;
 244          v3_muladds( last, v0, t, local );
 245          v3_sub( gate->co[0], local, rel );
 246
 247          v3f vup, vside;
 248          m3x3_mulv( gate->to_world, (v3f){0.0f,1.0f,0.0f}, vup );
 249          m3x3_mulv( gate->to_world, (v3f){1.0f,0.0f,0.0f}, vside );
 250
 251          v2f xy = { v3_dot( rel, vside ), v3_dot( rel, vup ) };
 252
 253          if( fabsf(xy[0]) <= gate->dims[0] && fabsf(xy[1]) <= gate->dims[1] )
 254          {
 255             return 1;
 256          }
 257       }
 258    }
 259
 260    return 0;
 261 }
 262
 263 #endif /* WORLD_GATE_H */