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, vao, vbo;
  15    glmesh mdl;
  16 }
  17 grender;
  18
  19 struct teleport_gate
  20 {
  21    v3f co;
  22    v4f q;
  23    v2f dims;
  24
  25    m4x3f to_world, to_local;
  26    teleport_gate *other;
  27 };
  28
  29 static void gate_transform_update( teleport_gate *gate )
  30 {
  31    q_m3x3( gate->q, gate->to_world );
  32    v3_copy( gate->co, gate->to_world[3] );
  33
  34    m4x3_invert_affine( gate->to_world, gate->to_local );
  35 }
  36
  37 static void gate_register(void)
  38 {
  39    shader_gate_register();
  40 }
  41
  42 static void gate_init( void (*newfb)(GLuint*,GLuint*,GLuint*) )
  43 {
  44    newfb( &grender.fb, &grender.rgb, &grender.rb );
  45    {
  46       float ksz = 1.0f;
  47       float quad[] = { -ksz,-ksz,0.0f,  ksz, ksz,0.0f, -ksz, ksz,0.0f,
  48                        -ksz,-ksz,0.0f,  ksz,-ksz,0.0f,  ksz, ksz,0.0f,
  49                        -ksz,-ksz,-0.1f,  ksz, ksz,-0.1f, -ksz, ksz,-0.1f,
  50                        -ksz,-ksz,-0.1f,  ksz,-ksz,-0.1f,  ksz, ksz,-0.1f };
  51
  52       glGenVertexArrays( 1, &grender.vao );
  53       glGenBuffers( 1, &grender.vbo );
  54       glBindVertexArray( grender.vao );
  55       glBindBuffer( GL_ARRAY_BUFFER, grender.vbo );
  56       glBufferData( GL_ARRAY_BUFFER, sizeof(quad), quad, GL_STATIC_DRAW );
  57       glBindVertexArray( grender.vao );
  58       glVertexAttribPointer( 0, 3, GL_FLOAT, GL_FALSE,
  59             sizeof(float)*3, (void*)0 );
  60       glEnableVertexAttribArray( 0 );
  61       VG_CHECK_GL();
  62    }
  63
  64    model *mgate = vg_asset_read( "models/rs_gate.mdl" );
  65    model_unpack( mgate, &grender.mdl );
  66    free( mgate );
  67 }
  68
  69 static void gate_fb_resize( void (*resize)(GLuint*,GLuint*,GLuint*) )
  70 {
  71    resize( &grender.fb, &grender.rgb, &grender.rb );
  72 }
  73
  74 static void 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    if( v3_dot(viewdir, gatedir) <= 0.0f )
  82       return;
  83
  84    v3f v0;
  85    v3_sub( viewpos, gate->co, v0 );
  86    if( v3_dot(v0, gatedir) >= 0.0f )
  87       return;
  88
  89    m4x3f transport;
  90    m4x3_mul( gate->other->to_world, gate->to_local, transport );
  91
  92    v3f a,b,c,d;
  93
  94    float sx = gate->dims[0],
  95          sy = gate->dims[1];
  96    m4x3_mulv( gate->to_world, (v3f){-sx,-sy,0.0f}, a );
  97    m4x3_mulv( gate->to_world, (v3f){ sx,-sy,0.0f}, b );
  98    m4x3_mulv( gate->to_world, (v3f){ sx, sy,0.0f}, c );
  99    m4x3_mulv( gate->to_world, (v3f){-sx, sy,0.0f}, d );
 100
 101    vg_line( a,b, 0xffffa000 );
 102    vg_line( b,c, 0xffffa000 );
 103    vg_line( c,d, 0xffffa000 );
 104    vg_line( d,a, 0xffffa000 );
 105
 106    vg_line( gate->co, gate->other->co, 0xffffffff );
 107
 108    m4x3f cam_new;
 109    m4x3_mul( transport, camera, cam_new );
 110
 111    vg_line_pt3( cam_new[3], 0.3f, 0xff00ff00 );
 112
 113    glBindFramebuffer( GL_FRAMEBUFFER, grender.fb );
 114    glClearColor( 0.11f, 0.35f, 0.37f, 1.0f );
 115    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
 116
 117    m4x3f inverse;
 118    m4x3_invert_affine( cam_new, inverse );
 119
 120    m4x4f view;
 121    m4x3_expand( inverse, view );
 122
 123    v4f surface;
 124    m3x3_mulv( gate->other->to_world, (v3f){0.0f,0.0f,-1.0f}, surface );
 125    surface[3] = v3_dot( surface, gate->other->co );
 126
 127    m4x4f projection;
 128    m4x4_projection( projection,
 129          gpipeline.fov,
 130          (float)vg_window_x / (float)vg_window_y,
 131          0.1f, 900.0f );
 132
 133 #if 0 /* For debugging frustum */
 134    {
 135       m4x4f devm;
 136       m4x4_mul( projection, view, devm );
 137       m4x4_inv( devm, devm );
 138
 139       v4f corners[] =
 140       {
 141          {-1,-1,-1, 1}, { 1,-1,-1, 1}, { 1, 1,-1, 1}, {-1, 1,-1, 1},
 142          {-1,-1, 1, 1}, { 1,-1, 1, 1}, { 1, 1, 1, 1}, {-1, 1, 1, 1}
 143       };
 144
 145       for( int i=0; i<vg_list_size(corners); i++ )
 146       {
 147          m4x4_mulv( devm, corners[i], corners[i] );
 148          v3_muls( corners[i], 1.0f/corners[i][3], corners[i] );
 149       }
 150
 151       vg_line( corners[0], corners[1], 0xffffffff );
 152       vg_line( corners[1], corners[2], 0xffffffff );
 153       vg_line( corners[2], corners[3], 0xffffffff );
 154       vg_line( corners[3], corners[0], 0xffffffff );
 155       vg_line( corners[4], corners[5], 0xffffffff );
 156       vg_line( corners[5], corners[6], 0xffffffff );
 157       vg_line( corners[6], corners[7], 0xffffffff );
 158       vg_line( corners[7], corners[4], 0xffffffff );
 159       vg_line( corners[0], corners[4], 0xffffffff );
 160       vg_line( corners[1], corners[5], 0xffffffff );
 161       vg_line( corners[2], corners[6], 0xffffffff );
 162       vg_line( corners[3], corners[7], 0xffffffff );
 163
 164       v3f clipped[4];
 165       for( int i=0; i<4; i++ )
 166       {
 167          v3f v0, c, delta, p0;
 168          v3_sub( corners[4+i],corners[0+i], v0 );
 169          v3_normalize(v0);
 170
 171          v3_muls( surface, surface[3], c );
 172          v3_sub( c, corners[0+i], delta );
 173
 174          float t = v3_dot(delta, surface) / v3_dot(surface, v0);
 175          v3_muladds( corners[0+i], v0, t, clipped[i] );
 176       }
 177
 178       vg_line( clipped[0], clipped[1], 0xff0000ff );
 179       vg_line( clipped[1], clipped[2], 0xff0000ff );
 180       vg_line( clipped[2], clipped[3], 0xff0000ff );
 181       vg_line( clipped[3], clipped[0], 0xff0000ff );
 182
 183       m4x3_mulv( gate->other->to_world, (v3f){-2.0f,-2.0f,0.0f}, a );
 184       m4x3_mulv( gate->other->to_world, (v3f){ 2.0f,-2.0f,0.0f}, b );
 185       m4x3_mulv( gate->other->to_world, (v3f){ 2.0f, 2.0f,0.0f}, c );
 186       m4x3_mulv( gate->other->to_world, (v3f){-2.0f, 2.0f,0.0f}, d );
 187
 188       vg_line( clipped[0], a, 0xff0000ff );
 189       vg_line( clipped[1], b, 0xff0000ff );
 190       vg_line( clipped[2], c, 0xff0000ff );
 191       vg_line( clipped[3], d, 0xff0000ff );
 192    }
 193 #endif
 194
 195    m4x3_mulp( inverse, surface, surface );
 196    surface[3] = -fabsf(surface[3]);
 197    plane_clip_projection( projection, surface );
 198
 199    m4x4_mul( projection, view, projection );
 200
 201    render_world( projection );
 202    render_water_texture( cam_new );
 203    glBindFramebuffer( GL_FRAMEBUFFER, grender.fb );
 204    render_water_surface( projection );
 205    glBindFramebuffer( GL_FRAMEBUFFER, 0 );
 206
 207    shader_gate_use();
 208
 209    m4x3f full;
 210    m4x3_copy( gate->to_world, full );
 211    m4x3_scalev( full, (v3f){ gate->dims[0], gate->dims[1], 1.0f } );
 212
 213    shader_gate_uPv( vg_pv );
 214    shader_gate_uMdl( full );
 215
 216    glActiveTexture( GL_TEXTURE0 );
 217    glBindTexture( GL_TEXTURE_2D, grender.rgb );
 218    shader_gate_uCam( viewpos );
 219    shader_gate_uTexMain( 0 );
 220    shader_gate_uTexWater( 1 );
 221    shader_gate_uTime( vg_time*0.25f );
 222    shader_gate_uInvRes( (v2f){
 223          1.0f / (float)vg_window_x,
 224          1.0f / (float)vg_window_y });
 225
 226    glEnable(GL_BLEND);
 227    glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 228    glBlendEquation(GL_FUNC_ADD);
 229
 230    mesh_bind( &grender.mdl );
 231    mesh_draw( &grender.mdl );
 232
 233    glDisable(GL_BLEND);
 234    return;
 235    glBindVertexArray( grender.vao );
 236    glDrawArrays( GL_TRIANGLES, 0, 12 );
 237 }
 238
 239 static int gate_intersect( teleport_gate *gate, v3f pos, v3f last )
 240 {
 241    v4f surface;
 242    m3x3_mulv( gate->to_world, (v3f){0.0f,0.0f,-1.0f}, surface );
 243    surface[3] = v3_dot( surface, gate->co );
 244
 245    v3f v0, c, delta, p0;
 246    v3_sub( pos, last, v0 );
 247    float l = v3_length( v0 );
 248    v3_divs( v0, l, v0 );
 249
 250    v3_muls( surface, surface[3], c );
 251    v3_sub( c, last, delta );
 252
 253    float d = v3_dot(surface, v0);
 254
 255    if( fabsf(d) > 0.00001f )
 256    {
 257       float t = v3_dot(delta, surface) / d;
 258       if( t >= 0.0f && t <= l )
 259       {
 260          v3f local, rel;
 261          v3_muladds( last, v0, t, local );
 262          v3_sub( gate->co, local, rel );
 263
 264          v3f vup, vside;
 265          m3x3_mulv( gate->to_world, (v3f){0.0f,1.0f,0.0f}, vup );
 266          m3x3_mulv( gate->to_world, (v3f){1.0f,0.0f,0.0f}, vside );
 267
 268          v2f xy = { v3_dot( rel, vside ), v3_dot( rel, vup ) };
 269
 270          if( fabsf(xy[0]) <= gate->dims[0] && fabsf(xy[1]) <= gate->dims[1] )
 271          {
 272             return 1;
 273          }
 274       }
 275    }
 276
 277    return 0;
 278 }
 279
 280 #endif