world_water.h

   1 /*
   2  * Copyright (C) 2021-2022 Mt.ZERO Software, Harry Godden - All Rights Reserved
   3  */
   4
   5 #ifndef WATER_H
   6 #define WATER_H
   7
   8 #include "world.h"
   9 #include "render.h"
  10 #include "shaders/water.h"
  11 #include "scene.h"
  12
  13 vg_tex2d tex_water_surf = { .path = "textures/water_surf.qoi" };
  14
  15 VG_STATIC void world_water_init(void)
  16 {
  17    vg_info( "world_water_init\n" );
  18    shader_water_register();
  19
  20    vg_acquire_thread_sync();
  21    {
  22       world.water.fbreflect.format  = GL_RGB;
  23       world.water.fbreflect.div     = 3;
  24       world.water.fbdepth.format    = GL_RGBA;
  25       world.water.fbdepth.div       = 4;
  26
  27       fb_init( &world.water.fbreflect );
  28       fb_init( &world.water.fbdepth );
  29
  30       vg_tex2d_init( (vg_tex2d *[]){&tex_water_surf}, 1 );
  31    }
  32    vg_release_thread_sync();
  33
  34    vg_success( "done\n" );
  35 }
  36
  37 VG_STATIC void water_fb_resize(void)
  38 {
  39    if( !world.water.enabled )
  40       return;
  41
  42    fb_resize( &world.water.fbreflect );
  43    fb_resize( &world.water.fbdepth );
  44 }
  45
  46 VG_STATIC void water_set_surface( float height )
  47 {
  48    world.water.height = height;
  49    v4_copy( (v4f){ 0.0f, 1.0f, 0.0f, height }, world.water.plane );
  50 }
  51
  52 VG_STATIC void render_water_texture( m4x3f camera )
  53 {
  54    if( !world.water.enabled )
  55       return;
  56
  57    /* Draw reflection buffa */
  58    fb_use( &world.water.fbreflect );
  59    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
  60
  61    m4x3f new_cam, inverse;
  62    v3_copy( camera[3], new_cam[3] );
  63    new_cam[3][1] -= 2.0f * (camera[3][1] - world.water.height);
  64
  65    m3x3f flip;
  66    m3x3_identity( flip );
  67    flip[1][1] = -1.0f;
  68    m3x3_mul( flip, camera, new_cam );
  69
  70
  71    v3f p0;
  72    m3x3_mulv( new_cam, (v3f){0.0f,0.0f,-1.0f}, p0 );
  73    v3_add( new_cam[3], p0, p0 );
  74    vg_line( new_cam[3], p0, 0xffffffff );
  75
  76    m4x4f view;
  77    vg_line_pt3( new_cam[3], 0.3f, 0xff00ffff );
  78
  79    m4x3_invert_affine( new_cam, inverse );
  80    m4x3_expand( inverse, view );
  81
  82    v4f clippa = { 0.0f, 1.0f, 0.0f, world.water.height-0.1f };
  83    m4x3_mulp( inverse, clippa, clippa );
  84    clippa[3] *= -1.0f;
  85
  86    m4x4f projection;
  87    m4x4_projection( projection,
  88          gpipeline.fov,
  89          (float)vg.window_x / (float)vg.window_y,
  90          0.1f, 900.0f );
  91    plane_clip_projection( projection, clippa );
  92    m4x4_mul( projection, view, projection );
  93
  94    glCullFace( GL_FRONT );
  95    render_world( projection, new_cam );
  96    glCullFace( GL_BACK );
  97
  98
  99    /* Draw beneath texture */
 100    fb_use( &world.water.fbdepth );
 101    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
 102
 103    m4x3_invert_affine( camera, inverse );
 104    m4x3_expand( inverse, view );
 105
 106    float bias = -(camera[3][1]-world.water.height)*0.1f;
 107    v4f clippb = { 0.0f, -1.0f, 0.0f, -(world.water.height) + bias };
 108    m4x3_mulp( inverse, clippb, clippb );
 109    clippb[3] *= -1.0f;
 110
 111    m4x4_projection( projection,
 112          gpipeline.fov,
 113          (float)vg.window_x / (float)vg.window_y,
 114          0.1f, 900.0f );
 115
 116    plane_clip_projection( projection, clippb );
 117    m4x4_mul( projection, view, projection );
 118    render_world_depth( projection, camera );
 119
 120    glViewport( 0, 0, vg.window_x, vg.window_y );
 121 }
 122
 123 VG_STATIC void render_water_surface( m4x4f pv, m4x3f camera )
 124 {
 125    if( !world.water.enabled )
 126       return;
 127
 128    /* Draw surface */
 129    shader_water_use();
 130
 131    fb_bindtex( &world.water.fbreflect, 0 );
 132    shader_water_uTexMain( 0 );
 133
 134    vg_tex2d_bind( &tex_water_surf, 1 );
 135    shader_water_uTexDudv( 1 );
 136    shader_water_uInvRes( (v2f){
 137          1.0f / (float)vg.window_x,
 138          1.0f / (float)vg.window_y });
 139
 140    shader_link_standard_ub( _shader_water.id, 2 );
 141
 142    fb_bindtex( &world.water.fbdepth, 3 );
 143    shader_water_uTexBack( 3 );
 144    shader_water_uTime( world.time );
 145    shader_water_uCamera( camera[3] );
 146    shader_water_uSurfaceY( world.water.height );
 147
 148    shader_water_uPv( pv );
 149
 150    m4x3f full;
 151    m4x3_identity( full );
 152    full[3][1] = world.water.height;
 153
 154    shader_water_uMdl( full );
 155
 156    glEnable(GL_BLEND);
 157    glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 158    glBlendEquation(GL_FUNC_ADD);
 159
 160    mesh_bind( &world.mesh_water );
 161    mesh_draw( &world.mesh_water );
 162
 163    glDisable(GL_BLEND);
 164 }
 165
 166 #endif /* WATER_H */