world_water.h

   1 #ifndef WATER_H
   2 #define WATER_H
   3
   4 #include "world.h"
   5 #include "render.h"
   6 #include "shaders/water.h"
   7 #include "scene.h"
   8
   9 vg_tex2d tex_water_surf = { .path = "textures/water_surf.qoi" };
  10
  11 static struct
  12 {
  13    struct framebuffer fbreflect, fbdepth;
  14    glmesh mdl;
  15
  16    boxf depthbounds;
  17    int depth_computed;
  18
  19    float height;
  20    int enabled;
  21    v4f plane;
  22 }
  23 wrender =
  24 {
  25    .fbreflect = { .format = GL_RGB,  .div = 3 },
  26    .fbdepth   = { .format = GL_RGBA, .div = 4 }
  27 };
  28
  29 static int world_water_init(void)
  30 {
  31    vg_info( "world_water_init\n" );
  32    shader_water_register();
  33
  34    if( vg_acquire_thread_sync(1) )
  35    {
  36       if( !fb_init( &wrender.fbreflect ) ||
  37           !fb_init( &wrender.fbdepth ) )
  38       {
  39          vg_release_thread_sync(1);
  40          return 0;
  41       }
  42
  43       vg_tex2d_init( (vg_tex2d *[]){&tex_water_surf}, 1 );
  44
  45       vg_success( "done\n" );
  46       vg_release_thread_sync(1);
  47       return 1;
  48    }
  49    else
  50       return 0;
  51 }
  52
  53 static void world_water_free(void *_)
  54 {
  55    vg_tex2d_free( (vg_tex2d *[]){&tex_water_surf}, 1 );
  56    fb_free( &wrender.fbreflect );
  57    fb_free( &wrender.fbdepth );
  58 }
  59
  60 static void water_fb_resize(void)
  61 {
  62    if( !wrender.enabled )
  63       return;
  64
  65    fb_resize( &wrender.fbreflect );
  66    fb_resize( &wrender.fbdepth );
  67 }
  68
  69 static void water_set_surface( glmesh *surf, float height )
  70 {
  71    wrender.mdl = *surf;
  72    wrender.height = height;
  73    wrender.enabled = 1;
  74
  75    v4_copy( (v4f){ 0.0f, 1.0f, 0.0f, height }, wrender.plane );
  76 }
  77
  78 static void render_water_texture( m4x3f camera )
  79 {
  80    if( !wrender.enabled )
  81       return;
  82
  83    /* Draw reflection buffa */
  84    fb_use( &wrender.fbreflect );
  85    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
  86
  87    m4x3f new_cam, inverse;
  88    v3_copy( camera[3], new_cam[3] );
  89    new_cam[3][1] -= 2.0f * (camera[3][1] - wrender.height);
  90
  91    m3x3f flip;
  92    m3x3_identity( flip );
  93    flip[1][1] = -1.0f;
  94    m3x3_mul( flip, camera, new_cam );
  95
  96
  97    v3f p0;
  98    m3x3_mulv( new_cam, (v3f){0.0f,0.0f,-1.0f}, p0 );
  99    v3_add( new_cam[3], p0, p0 );
 100    vg_line( new_cam[3], p0, 0xffffffff );
 101
 102    m4x4f view;
 103    vg_line_pt3( new_cam[3], 0.3f, 0xff00ffff );
 104
 105    m4x3_invert_affine( new_cam, inverse );
 106    m4x3_expand( inverse, view );
 107
 108    v4f clippa = { 0.0f, 1.0f, 0.0f, wrender.height-0.1f };
 109    m4x3_mulp( inverse, clippa, clippa );
 110    clippa[3] *= -1.0f;
 111
 112    m4x4f projection;
 113    m4x4_projection( projection,
 114          gpipeline.fov,
 115          (float)vg_window_x / (float)vg_window_y,
 116          0.1f, 900.0f );
 117    plane_clip_projection( projection, clippa );
 118    m4x4_mul( projection, view, projection );
 119
 120    glCullFace( GL_FRONT );
 121    render_world( projection, new_cam );
 122    glCullFace( GL_BACK );
 123
 124
 125    /* Draw beneath texture */
 126    fb_use( &wrender.fbdepth );
 127    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
 128
 129    m4x3_invert_affine( camera, inverse );
 130    m4x3_expand( inverse, view );
 131
 132    float bias = -(camera[3][1]-wrender.height)*0.1f;
 133    v4f clippb = { 0.0f, -1.0f, 0.0f, -(wrender.height) + bias };
 134    m4x3_mulp( inverse, clippb, clippb );
 135    clippb[3] *= -1.0f;
 136
 137    m4x4_projection( projection,
 138          gpipeline.fov,
 139          (float)vg_window_x / (float)vg_window_y,
 140          0.1f, 900.0f );
 141
 142    plane_clip_projection( projection, clippb );
 143    m4x4_mul( projection, view, projection );
 144    render_world_depth( projection, camera );
 145
 146    glViewport( 0, 0, vg_window_x, vg_window_y );
 147 }
 148
 149 static void render_water_surface( m4x4f pv, m4x3f camera )
 150 {
 151    if( !wrender.enabled )
 152       return;
 153
 154    /* Draw surface */
 155    shader_water_use();
 156
 157    fb_bindtex( &wrender.fbreflect, 0 );
 158    shader_water_uTexMain( 0 );
 159
 160    vg_tex2d_bind( &tex_water_surf, 1 );
 161    shader_water_uTexDudv( 1 );
 162    shader_water_uInvRes( (v2f){
 163          1.0f / (float)vg_window_x,
 164          1.0f / (float)vg_window_y });
 165
 166    shader_link_standard_ub( _shader_water.id, 2 );
 167
 168    fb_bindtex( &wrender.fbdepth, 3 );
 169    shader_water_uTexBack( 3 );
 170    shader_water_uTime( vg_time );
 171    shader_water_uCamera( camera[3] );
 172    shader_water_uSurfaceY( wrender.height );
 173
 174    shader_water_uPv( pv );
 175
 176    m4x3f full;
 177    m4x3_identity( full );
 178    full[3][1] = wrender.height;
 179
 180    shader_water_uMdl( full );
 181
 182    glEnable(GL_BLEND);
 183    glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 184    glBlendEquation(GL_FUNC_ADD);
 185
 186    mesh_bind( &wrender.mdl );
 187    mesh_draw( &wrender.mdl );
 188
 189    glDisable(GL_BLEND);
 190 }
 191
 192 #endif /* WATER_H */