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)
  70 {
  71    resize_renderbuffer_std( &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    pipeline_projection( projection, 0.1f, 900.0f );
 129
 130 #if 0 /* For debugging frustum */
 131    {
 132       m4x4f devm;
 133       m4x4_mul( projection, view, devm );
 134       m4x4_inv( devm, devm );
 135
 136       v4f corners[] =
 137       {
 138          {-1,-1,-1, 1}, { 1,-1,-1, 1}, { 1, 1,-1, 1}, {-1, 1,-1, 1},
 139          {-1,-1, 1, 1}, { 1,-1, 1, 1}, { 1, 1, 1, 1}, {-1, 1, 1, 1}
 140       };
 141
 142       for( int i=0; i<vg_list_size(corners); i++ )
 143       {
 144          m4x4_mulv( devm, corners[i], corners[i] );
 145          v3_muls( corners[i], 1.0f/corners[i][3], corners[i] );
 146       }
 147
 148       vg_line( corners[0], corners[1], 0xffffffff );
 149       vg_line( corners[1], corners[2], 0xffffffff );
 150       vg_line( corners[2], corners[3], 0xffffffff );
 151       vg_line( corners[3], corners[0], 0xffffffff );
 152       vg_line( corners[4], corners[5], 0xffffffff );
 153       vg_line( corners[5], corners[6], 0xffffffff );
 154       vg_line( corners[6], corners[7], 0xffffffff );
 155       vg_line( corners[7], corners[4], 0xffffffff );
 156       vg_line( corners[0], corners[4], 0xffffffff );
 157       vg_line( corners[1], corners[5], 0xffffffff );
 158       vg_line( corners[2], corners[6], 0xffffffff );
 159       vg_line( corners[3], corners[7], 0xffffffff );
 160
 161       v3f clipped[4];
 162       for( int i=0; i<4; i++ )
 163       {
 164          v3f v0, c, delta, p0;
 165          v3_sub( corners[4+i],corners[0+i], v0 );
 166          v3_normalize(v0);
 167
 168          v3_muls( surface, surface[3], c );
 169          v3_sub( c, corners[0+i], delta );
 170
 171          float t = v3_dot(delta, surface) / v3_dot(surface, v0);
 172          v3_muladds( corners[0+i], v0, t, clipped[i] );
 173       }
 174
 175       vg_line( clipped[0], clipped[1], 0xff0000ff );
 176       vg_line( clipped[1], clipped[2], 0xff0000ff );
 177       vg_line( clipped[2], clipped[3], 0xff0000ff );
 178       vg_line( clipped[3], clipped[0], 0xff0000ff );
 179
 180       m4x3_mulv( gate->other->to_world, (v3f){-2.0f,-2.0f,0.0f}, a );
 181       m4x3_mulv( gate->other->to_world, (v3f){ 2.0f,-2.0f,0.0f}, b );
 182       m4x3_mulv( gate->other->to_world, (v3f){ 2.0f, 2.0f,0.0f}, c );
 183       m4x3_mulv( gate->other->to_world, (v3f){-2.0f, 2.0f,0.0f}, d );
 184
 185       vg_line( clipped[0], a, 0xff0000ff );
 186       vg_line( clipped[1], b, 0xff0000ff );
 187       vg_line( clipped[2], c, 0xff0000ff );
 188       vg_line( clipped[3], d, 0xff0000ff );
 189    }
 190 #endif
 191
 192    m4x3_mulp( inverse, surface, surface );
 193    surface[3] = -fabsf(surface[3]);
 194    plane_clip_projection( projection, surface );
 195
 196    m4x4_mul( projection, view, projection );
 197
 198    render_world( projection, cam_new );
 199    render_water_texture( cam_new );
 200    glBindFramebuffer( GL_FRAMEBUFFER, grender.fb );
 201    render_water_surface( projection );
 202    glBindFramebuffer( GL_FRAMEBUFFER, 0 );
 203
 204    shader_gate_use();
 205
 206    m4x3f full;
 207    m4x3_copy( gate->to_world, full );
 208    m4x3_scalev( full, (v3f){ gate->dims[0], gate->dims[1], 1.0f } );
 209
 210    shader_gate_uPv( vg_pv );
 211    shader_gate_uMdl( full );
 212
 213    glActiveTexture( GL_TEXTURE0 );
 214    glBindTexture( GL_TEXTURE_2D, grender.rgb );
 215    shader_gate_uCam( viewpos );
 216    shader_gate_uTexMain( 0 );
 217    shader_gate_uTexWater( 1 );
 218    shader_gate_uTime( vg_time*0.25f );
 219    shader_gate_uInvRes( (v2f){
 220          1.0f / (float)vg_window_x,
 221          1.0f / (float)vg_window_y });
 222
 223    glEnable(GL_BLEND);
 224    glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 225    glBlendEquation(GL_FUNC_ADD);
 226
 227    mesh_bind( &grender.mdl );
 228    mesh_draw( &grender.mdl );
 229
 230    glDisable(GL_BLEND);
 231    return;
 232    glBindVertexArray( grender.vao );
 233    glDrawArrays( GL_TRIANGLES, 0, 12 );
 234 }
 235
 236 static int gate_intersect( teleport_gate *gate, v3f pos, v3f last )
 237 {
 238    v4f surface;
 239    m3x3_mulv( gate->to_world, (v3f){0.0f,0.0f,-1.0f}, surface );
 240    surface[3] = v3_dot( surface, gate->co );
 241
 242    v3f v0, c, delta, p0;
 243    v3_sub( pos, last, v0 );
 244    float l = v3_length( v0 );
 245    v3_divs( v0, l, v0 );
 246
 247    v3_muls( surface, surface[3], c );
 248    v3_sub( c, last, delta );
 249
 250    float d = v3_dot(surface, v0);
 251
 252    if( fabsf(d) > 0.00001f )
 253    {
 254       float t = v3_dot(delta, surface) / d;
 255       if( t >= 0.0f && t <= l )
 256       {
 257          v3f local, rel;
 258          v3_muladds( last, v0, t, local );
 259          v3_sub( gate->co, local, rel );
 260
 261          v3f vup, vside;
 262          m3x3_mulv( gate->to_world, (v3f){0.0f,1.0f,0.0f}, vup );
 263          m3x3_mulv( gate->to_world, (v3f){1.0f,0.0f,0.0f}, vside );
 264
 265          v2f xy = { v3_dot( rel, vside ), v3_dot( rel, vup ) };
 266
 267          if( fabsf(xy[0]) <= gate->dims[0] && fabsf(xy[1]) <= gate->dims[1] )
 268          {
 269             return 1;
 270          }
 271       }
 272    }
 273
 274    return 0;
 275 }
 276
 277 #endif