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 #include "shaders/gatelq.h"
  10 #include "water.h"
  11
  12 typedef struct teleport_gate teleport_gate;
  13
  14 static struct
  15 {
  16    GLuint fb, rgb, rb;
  17    glmesh mdl;
  18
  19    int high_qual; /* If in high performance mode, we don't use RT's, and
  20                             instead use stencil buffers.
  21                             There is therefore no heat warp effect. */
  22 }
  23 grender =
  24 {
  25    .high_qual = 0
  26 };
  27
  28 struct teleport_gate
  29 {
  30    v3f co[2];
  31    v4f q[2];
  32    v2f dims;
  33
  34    m4x3f to_world, recv_to_world, transport;
  35 };
  36
  37 static void gate_transform_update( teleport_gate *gate )
  38 {
  39    m4x3f to_local;
  40
  41    q_m3x3( gate->q[0], gate->to_world );
  42    v3_copy( gate->co[0], gate->to_world[3] );
  43
  44    m4x3_invert_affine( gate->to_world, to_local );
  45
  46    q_m3x3( gate->q[1], gate->recv_to_world );
  47    v3_copy( gate->co[1], gate->recv_to_world[3] );
  48    m4x3_mul( gate->recv_to_world, to_local, gate->transport );
  49 }
  50
  51 static void gate_register(void)
  52 {
  53    shader_gate_register();
  54    shader_gatelq_register();
  55 }
  56
  57 static void gate_init(void)
  58 {
  59    create_renderbuffer_std( &grender.fb, &grender.rgb, &grender.rb );
  60
  61    model *mgate = vg_asset_read( "models/rs_gate.mdl" );
  62    model_unpack( mgate, &grender.mdl );
  63    free( mgate );
  64 }
  65
  66 static void gate_fb_resize(void)
  67 {
  68    resize_renderbuffer_std( &grender.fb, &grender.rgb, &grender.rb );
  69 }
  70
  71 static void render_gate( teleport_gate *gate, m4x3f camera )
  72 {
  73    v3f viewpos, viewdir, gatedir;
  74    v3_copy( camera[3], viewpos );
  75    m3x3_mulv( camera, (v3f){0.0f,0.0f,-1.0f}, viewdir );
  76    m3x3_mulv( gate->to_world, (v3f){0.0f,0.0f,-1.0f}, gatedir );
  77
  78    v3f v0;
  79    v3_sub( viewpos, gate->co[0], v0 );
  80    if( v3_dot(v0, gatedir) >= 0.0f )
  81       return;
  82
  83    if( v3_dist( viewpos, gate->co[0] ) > 100.0f )
  84       return;
  85
  86    v3f a,b,c,d;
  87
  88    float sx = gate->dims[0],
  89          sy = gate->dims[1];
  90    m4x3_mulv( gate->to_world, (v3f){-sx,-sy,0.0f}, a );
  91    m4x3_mulv( gate->to_world, (v3f){ sx,-sy,0.0f}, b );
  92    m4x3_mulv( gate->to_world, (v3f){ sx, sy,0.0f}, c );
  93    m4x3_mulv( gate->to_world, (v3f){-sx, sy,0.0f}, d );
  94
  95    vg_line( a,b, 0xffffa000 );
  96    vg_line( b,c, 0xffffa000 );
  97    vg_line( c,d, 0xffffa000 );
  98    vg_line( d,a, 0xffffa000 );
  99
 100    vg_line2( gate->co[0], gate->co[1], 0xff0000ff, 0x00000000 );
 101
 102    m4x3f cam_new;
 103    m4x3_mul( gate->transport, camera, cam_new );
 104
 105    vg_line_pt3( cam_new[3], 0.3f, 0xff00ff00 );
 106
 107    m4x3f gate_xform;
 108    m4x3_copy( gate->to_world, gate_xform );
 109    m4x3_scalev( gate_xform, (v3f){ gate->dims[0], gate->dims[1], 1.0f } );
 110
 111    m4x3f inverse;
 112    m4x3_invert_affine( cam_new, inverse );
 113
 114    m4x4f view;
 115    m4x3_expand( inverse, view );
 116
 117    v4f surface;
 118    m3x3_mulv( gate->recv_to_world, (v3f){0.0f,0.0f,-1.0f}, surface );
 119    surface[3] = v3_dot( surface, gate->co[1] );
 120
 121    m4x4f projection;
 122    pipeline_projection( projection, 0.1f, 900.0f );
 123
 124    m4x3_mulp( inverse, surface, surface );
 125    surface[3] = -fabsf(surface[3]);
 126    plane_clip_projection( projection, surface );
 127
 128    m4x4_mul( projection, view, projection );
 129
 130    if( grender.high_qual )
 131    {
 132       glBindFramebuffer( GL_FRAMEBUFFER, grender.fb );
 133       glClearColor( 0.11f, 0.35f, 0.37f, 1.0f );
 134       glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
 135    }
 136    else
 137    {
 138       shader_gatelq_use();
 139       shader_gatelq_uPv( vg_pv );
 140       shader_gatelq_uMdl( gate_xform );
 141       shader_gatelq_uCam( viewpos );
 142       shader_gatelq_uTime( vg_time*0.25f );
 143       shader_gatelq_uInvRes( (v2f){
 144             1.0f / (float)vg_window_x,
 145             1.0f / (float)vg_window_y });
 146
 147       glEnable( GL_STENCIL_TEST );
 148       glStencilOp( GL_KEEP, GL_KEEP, GL_REPLACE );
 149       glStencilFunc( GL_ALWAYS, 1, 0xFF );
 150       glStencilMask( 0xFF );
 151
 152       mesh_bind( &grender.mdl );
 153       mesh_draw( &grender.mdl );
 154
 155       glClear( GL_DEPTH_BUFFER_BIT );
 156       glStencilFunc( GL_EQUAL, 1, 0xFF );
 157       glStencilMask( 0x00 );
 158    }
 159
 160    render_world( projection, cam_new );
 161
 162    if( grender.high_qual )
 163    {
 164       /*
 165        * TODO: Need to find a way to draw a stencil buffer into the water
 166        *       rendering
 167        */
 168
 169       render_water_texture( cam_new );
 170       glBindFramebuffer( GL_FRAMEBUFFER, grender.fb );
 171       render_water_surface( projection );
 172       glBindFramebuffer( GL_FRAMEBUFFER, 0 );
 173
 174       shader_gate_use();
 175
 176       shader_gate_uPv( vg_pv );
 177       shader_gate_uMdl( gate_xform );
 178
 179       glActiveTexture( GL_TEXTURE0 );
 180       glBindTexture( GL_TEXTURE_2D, grender.rgb );
 181       shader_gate_uCam( viewpos );
 182       shader_gate_uTexMain( 0 );
 183       shader_gate_uTexWater( 1 );
 184       shader_gate_uTime( vg_time*0.25f );
 185       shader_gate_uInvRes( (v2f){
 186             1.0f / (float)vg_window_x,
 187             1.0f / (float)vg_window_y });
 188
 189       glEnable(GL_BLEND);
 190       glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 191       glBlendEquation(GL_FUNC_ADD);
 192
 193       mesh_bind( &grender.mdl );
 194       mesh_draw( &grender.mdl );
 195
 196       glDisable(GL_BLEND);
 197    }
 198    else
 199    {
 200       glStencilMask( 0xFF );
 201       glStencilFunc( GL_ALWAYS, 1, 0xFF );
 202       glDisable( GL_STENCIL_TEST );
 203    }
 204 }
 205
 206 static int gate_intersect( teleport_gate *gate, v3f pos, v3f last )
 207 {
 208    v4f surface;
 209    m3x3_mulv( gate->to_world, (v3f){0.0f,0.0f,-1.0f}, surface );
 210    surface[3] = v3_dot( surface, gate->co[0] );
 211
 212    v3f v0, c, delta, p0;
 213    v3_sub( pos, last, v0 );
 214    float l = v3_length( v0 );
 215    v3_divs( v0, l, v0 );
 216
 217    v3_muls( surface, surface[3], c );
 218    v3_sub( c, last, delta );
 219
 220    float d = v3_dot(surface, v0);
 221
 222    if( fabsf(d) > 0.00001f )
 223    {
 224       float t = v3_dot(delta, surface) / d;
 225       if( t >= 0.0f && t <= l )
 226       {
 227          v3f local, rel;
 228          v3_muladds( last, v0, t, local );
 229          v3_sub( gate->co[0], local, rel );
 230
 231          v3f vup, vside;
 232          m3x3_mulv( gate->to_world, (v3f){0.0f,1.0f,0.0f}, vup );
 233          m3x3_mulv( gate->to_world, (v3f){1.0f,0.0f,0.0f}, vside );
 234
 235          v2f xy = { v3_dot( rel, vside ), v3_dot( rel, vup ) };
 236
 237          if( fabsf(xy[0]) <= gate->dims[0] && fabsf(xy[1]) <= gate->dims[1] )
 238          {
 239             return 1;
 240          }
 241       }
 242    }
 243
 244    return 0;
 245 }
 246
 247 #endif