gate.h

   1 #ifndef GATE_H
   2 #define GATE_H
   3
   4 #include "common.h"
   5 #include "model.h"
   6 #include "render.h"
   7 #include "shaders/gate.h"
   8 #include "shaders/gatelq.h"
   9 #include "water.h"
  10
  11 typedef struct teleport_gate teleport_gate;
  12
  13 static struct
  14 {
  15    struct framebuffer fb;
  16    glmesh mdl;
  17
  18    int high_qual; /* If in high performance mode, we don't use RT's, and
  19                       instead use stencil buffers.
  20                       There is therefore no heat warp effect. */
  21 }
  22 grender =
  23 {
  24    .high_qual = 0,
  25    .fb = {
  26       .format = GL_RGB,
  27       .div = 1
  28    }
  29 };
  30
  31 struct teleport_gate
  32 {
  33    v3f co[2];
  34    v4f q[2];
  35    v2f dims;
  36
  37    m4x3f to_world, recv_to_world, transport;
  38 };
  39
  40 static void gate_transform_update( teleport_gate *gate )
  41 {
  42    m4x3f to_local;
  43
  44    q_m3x3( gate->q[0], gate->to_world );
  45    v3_copy( gate->co[0], gate->to_world[3] );
  46
  47    m4x3_invert_affine( gate->to_world, to_local );
  48
  49    q_m3x3( gate->q[1], gate->recv_to_world );
  50    v3_copy( gate->co[1], gate->recv_to_world[3] );
  51    m4x3_mul( gate->recv_to_world, to_local, gate->transport );
  52 }
  53
  54 static void gate_register(void)
  55 {
  56    shader_gate_register();
  57    shader_gatelq_register();
  58 }
  59
  60 static void gate_init(void)
  61 {
  62    fb_init( &grender.fb );
  63
  64    mdl_header *mgate = mdl_load( "models/rs_gate.mdl" );
  65    mdl_unpack_glmesh( mgate, &grender.mdl );
  66    free( mgate );
  67 }
  68
  69 static void gate_fb_resize(void)
  70 {
  71    fb_resize( &grender.fb );
  72 }
  73
  74 static int render_gate( teleport_gate *gate, m4x3f camera )
  75 {
  76    v3f viewpos, viewdir, gatedir;
  77    v3_copy( camera[3], viewpos );
  78    m3x3_mulv( camera, (v3f){0.0f,0.0f,-1.0f}, viewdir );
  79    m3x3_mulv( gate->to_world, (v3f){0.0f,0.0f,-1.0f}, gatedir );
  80
  81    v3f v0;
  82    v3_sub( viewpos, gate->co[0], v0 );
  83    if( v3_dot(v0, gatedir) >= 0.0f )
  84       return 0;
  85
  86    if( v3_dist( viewpos, gate->co[0] ) > 100.0f )
  87       return 0;
  88
  89    v3f a,b,c,d;
  90
  91    float sx = gate->dims[0],
  92          sy = gate->dims[1];
  93    m4x3_mulv( gate->to_world, (v3f){-sx,-sy,0.0f}, a );
  94    m4x3_mulv( gate->to_world, (v3f){ sx,-sy,0.0f}, b );
  95    m4x3_mulv( gate->to_world, (v3f){ sx, sy,0.0f}, c );
  96    m4x3_mulv( gate->to_world, (v3f){-sx, sy,0.0f}, d );
  97
  98    vg_line( a,b, 0xffffa000 );
  99    vg_line( b,c, 0xffffa000 );
 100    vg_line( c,d, 0xffffa000 );
 101    vg_line( d,a, 0xffffa000 );
 102
 103    vg_line2( gate->co[0], gate->co[1], 0xff0000ff, 0x00000000 );
 104
 105    m4x3f cam_new;
 106    m4x3_mul( gate->transport, camera, cam_new );
 107
 108    vg_line_pt3( cam_new[3], 0.3f, 0xff00ff00 );
 109
 110    m4x3f gate_xform;
 111    m4x3_copy( gate->to_world, gate_xform );
 112    m4x3_scalev( gate_xform, (v3f){ gate->dims[0], gate->dims[1], 1.0f } );
 113
 114    m4x3f inverse;
 115    m4x3_invert_affine( cam_new, inverse );
 116
 117    m4x4f view;
 118    m4x3_expand( inverse, view );
 119
 120    v4f surface;
 121    m3x3_mulv( gate->recv_to_world, (v3f){0.0f,0.0f,-1.0f}, surface );
 122    surface[3] = v3_dot( surface, gate->co[1] );
 123
 124    m4x4f projection;
 125    pipeline_projection( projection, 0.1f, 900.0f );
 126
 127    m4x3_mulp( inverse, surface, surface );
 128    surface[3] = -fabsf(surface[3]);
 129    plane_clip_projection( projection, surface );
 130
 131    m4x4_mul( projection, view, projection );
 132
 133    if( grender.high_qual )
 134    {
 135       fb_use( &grender.fb );
 136       glClearColor( 0.11f, 0.35f, 0.37f, 1.0f );
 137       glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
 138    }
 139    else
 140    {
 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    }
 162
 163    render_world( projection, cam_new );
 164
 165    if( grender.high_qual )
 166    {
 167       /*
 168        * TODO: 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    }
 202    else
 203    {
 204       glDisable( GL_STENCIL_TEST );
 205
 206       render_water_texture( cam_new );
 207       fb_use( NULL );
 208       glEnable( GL_STENCIL_TEST );
 209
 210       render_water_surface( projection, cam_new );
 211
 212       glStencilMask( 0xFF );
 213       glStencilFunc( GL_ALWAYS, 1, 0xFF );
 214       glDisable( GL_STENCIL_TEST );
 215    }
 216
 217    return 1;
 218 }
 219
 220 static int gate_intersect( teleport_gate *gate, v3f pos, v3f last )
 221 {
 222    v4f surface;
 223    m3x3_mulv( gate->to_world, (v3f){0.0f,0.0f,-1.0f}, surface );
 224    surface[3] = v3_dot( surface, gate->co[0] );
 225
 226    v3f v0, c, delta, p0;
 227    v3_sub( pos, last, v0 );
 228    float l = v3_length( v0 );
 229    v3_divs( v0, l, v0 );
 230
 231    v3_muls( surface, surface[3], c );
 232    v3_sub( c, last, delta );
 233
 234    float d = v3_dot(surface, v0);
 235
 236    if( d > 0.00001f )
 237    {
 238       float t = v3_dot(delta, surface) / d;
 239       if( t >= 0.0f && t <= l )
 240       {
 241          v3f local, rel;
 242          v3_muladds( last, v0, t, local );
 243          v3_sub( gate->co[0], local, rel );
 244
 245          v3f vup, vside;
 246          m3x3_mulv( gate->to_world, (v3f){0.0f,1.0f,0.0f}, vup );
 247          m3x3_mulv( gate->to_world, (v3f){1.0f,0.0f,0.0f}, vside );
 248
 249          v2f xy = { v3_dot( rel, vside ), v3_dot( rel, vup ) };
 250
 251          if( fabsf(xy[0]) <= gate->dims[0] && fabsf(xy[1]) <= gate->dims[1] )
 252          {
 253             return 1;
 254          }
 255       }
 256    }
 257
 258    return 0;
 259 }
 260
 261 #endif