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