gate.h

   1 #ifndef GATE_H
   2 #define GATE_H
   3
   4 #define VG_3D
   5 #include "vg/vg.h"
   6 #include "model.h"
   7 #include "render.h"
   8 #include "shaders/gate.h"
   9
  10 typedef struct teleport_gate teleport_gate;
  11
  12 static struct
  13 {
  14    GLuint fb, rgb, rb;
  15    glmesh mdl;
  16 }
  17 grender;
  18
  19 struct teleport_gate
  20 {
  21    v3f co[2];
  22    v4f q[2];
  23    v2f dims;
  24
  25    m4x3f to_world, recv_to_world, transport;
  26 };
  27
  28 static void gate_transform_update( teleport_gate *gate )
  29 {
  30    m4x3f to_local;
  31
  32    q_m3x3( gate->q[0], gate->to_world );
  33    v3_copy( gate->co[0], gate->to_world[3] );
  34
  35    m4x3_invert_affine( gate->to_world, to_local );
  36
  37    q_m3x3( gate->q[1], gate->recv_to_world );
  38    v3_copy( gate->co[1], gate->recv_to_world[3] );
  39    m4x3_mul( gate->recv_to_world, to_local, gate->transport );
  40 }
  41
  42 static void gate_register(void)
  43 {
  44    shader_gate_register();
  45 }
  46
  47 static void gate_init(void)
  48 {
  49    create_renderbuffer_std( &grender.fb, &grender.rgb, &grender.rb );
  50
  51    model *mgate = vg_asset_read( "models/rs_gate.mdl" );
  52    model_unpack( mgate, &grender.mdl );
  53    free( mgate );
  54 }
  55
  56 static void gate_fb_resize(void)
  57 {
  58    resize_renderbuffer_std( &grender.fb, &grender.rgb, &grender.rb );
  59 }
  60
  61 static void render_gate( teleport_gate *gate, m4x3f camera )
  62 {
  63    v3f viewpos, viewdir, gatedir;
  64    v3_copy( camera[3], viewpos );
  65    m3x3_mulv( camera, (v3f){0.0f,0.0f,-1.0f}, viewdir );
  66    m3x3_mulv( gate->to_world, (v3f){0.0f,0.0f,-1.0f}, gatedir );
  67
  68    v3f v0;
  69    v3_sub( viewpos, gate->co[0], v0 );
  70    if( v3_dot(v0, gatedir) >= 0.0f )
  71       return;
  72
  73    v3f a,b,c,d;
  74
  75    float sx = gate->dims[0],
  76          sy = gate->dims[1];
  77    m4x3_mulv( gate->to_world, (v3f){-sx,-sy,0.0f}, a );
  78    m4x3_mulv( gate->to_world, (v3f){ sx,-sy,0.0f}, b );
  79    m4x3_mulv( gate->to_world, (v3f){ sx, sy,0.0f}, c );
  80    m4x3_mulv( gate->to_world, (v3f){-sx, sy,0.0f}, d );
  81
  82    vg_line( a,b, 0xffffa000 );
  83    vg_line( b,c, 0xffffa000 );
  84    vg_line( c,d, 0xffffa000 );
  85    vg_line( d,a, 0xffffa000 );
  86
  87    vg_line2( gate->co[0], gate->co[1], 0xff0000ff, 0x00000000 );
  88
  89    m4x3f cam_new;
  90    m4x3_mul( gate->transport, camera, cam_new );
  91
  92    vg_line_pt3( cam_new[3], 0.3f, 0xff00ff00 );
  93
  94    glBindFramebuffer( GL_FRAMEBUFFER, grender.fb );
  95    glClearColor( 0.11f, 0.35f, 0.37f, 1.0f );
  96    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
  97
  98    m4x3f inverse;
  99    m4x3_invert_affine( cam_new, inverse );
 100
 101    m4x4f view;
 102    m4x3_expand( inverse, view );
 103
 104    v4f surface;
 105    m3x3_mulv( gate->recv_to_world, (v3f){0.0f,0.0f,-1.0f}, surface );
 106    surface[3] = v3_dot( surface, gate->co[1] );
 107
 108    m4x4f projection;
 109    pipeline_projection( projection, 0.1f, 900.0f );
 110
 111
 112    m4x3_mulp( inverse, surface, surface );
 113    surface[3] = -fabsf(surface[3]);
 114    plane_clip_projection( projection, surface );
 115
 116    m4x4_mul( projection, view, projection );
 117
 118    render_world( projection, cam_new );
 119    render_water_texture( cam_new );
 120    glBindFramebuffer( GL_FRAMEBUFFER, grender.fb );
 121    render_water_surface( projection );
 122    glBindFramebuffer( GL_FRAMEBUFFER, 0 );
 123
 124    shader_gate_use();
 125
 126    m4x3f full;
 127    m4x3_copy( gate->to_world, full );
 128    m4x3_scalev( full, (v3f){ gate->dims[0], gate->dims[1], 1.0f } );
 129
 130    shader_gate_uPv( vg_pv );
 131    shader_gate_uMdl( full );
 132
 133    glActiveTexture( GL_TEXTURE0 );
 134    glBindTexture( GL_TEXTURE_2D, grender.rgb );
 135    shader_gate_uCam( viewpos );
 136    shader_gate_uTexMain( 0 );
 137    shader_gate_uTexWater( 1 );
 138    shader_gate_uTime( vg_time*0.25f );
 139    shader_gate_uInvRes( (v2f){
 140          1.0f / (float)vg_window_x,
 141          1.0f / (float)vg_window_y });
 142
 143    glEnable(GL_BLEND);
 144    glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 145    glBlendEquation(GL_FUNC_ADD);
 146
 147    mesh_bind( &grender.mdl );
 148    mesh_draw( &grender.mdl );
 149
 150    glDisable(GL_BLEND);
 151 }
 152
 153 static int gate_intersect( teleport_gate *gate, v3f pos, v3f last )
 154 {
 155    v4f surface;
 156    m3x3_mulv( gate->to_world, (v3f){0.0f,0.0f,-1.0f}, surface );
 157    surface[3] = v3_dot( surface, gate->co[0] );
 158
 159    v3f v0, c, delta, p0;
 160    v3_sub( pos, last, v0 );
 161    float l = v3_length( v0 );
 162    v3_divs( v0, l, v0 );
 163
 164    v3_muls( surface, surface[3], c );
 165    v3_sub( c, last, delta );
 166
 167    float d = v3_dot(surface, v0);
 168
 169    if( fabsf(d) > 0.00001f )
 170    {
 171       float t = v3_dot(delta, surface) / d;
 172       if( t >= 0.0f && t <= l )
 173       {
 174          v3f local, rel;
 175          v3_muladds( last, v0, t, local );
 176          v3_sub( gate->co[0], local, rel );
 177
 178          v3f vup, vside;
 179          m3x3_mulv( gate->to_world, (v3f){0.0f,1.0f,0.0f}, vup );
 180          m3x3_mulv( gate->to_world, (v3f){1.0f,0.0f,0.0f}, vside );
 181
 182          v2f xy = { v3_dot( rel, vside ), v3_dot( rel, vup ) };
 183
 184          if( fabsf(xy[0]) <= gate->dims[0] && fabsf(xy[1]) <= gate->dims[1] )
 185          {
 186             return 1;
 187          }
 188       }
 189    }
 190
 191    return 0;
 192 }
 193
 194 #endif