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 "shaders/water_fast.h"
  12 #include "scene.h"
  13
  14 vg_tex2d tex_water_surf = { .path = "textures/water_surf.qoi" };
  15
  16 VG_STATIC void world_water_init(void)
  17 {
  18    vg_info( "world_water_init\n" );
  19    shader_water_register();
  20    shader_water_fast_register();
  21
  22    vg_acquire_thread_sync();
  23    {
  24       world.water.fbreflect.format  = GL_RGB;
  25       world.water.fbreflect.div     = 3;
  26       world.water.fbdepth.format    = GL_RGBA;
  27       world.water.fbdepth.div       = 4;
  28
  29       fb_init( &world.water.fbreflect );
  30       fb_init( &world.water.fbdepth );
  31
  32       vg_tex2d_init( (vg_tex2d *[]){&tex_water_surf}, 1 );
  33    }
  34    vg_release_thread_sync();
  35
  36    vg_success( "done\n" );
  37 }
  38
  39 VG_STATIC void water_fb_resize(void)
  40 {
  41    if( !world.water.enabled )
  42       return;
  43
  44    fb_resize( &world.water.fbreflect );
  45    fb_resize( &world.water.fbdepth );
  46 }
  47
  48 VG_STATIC void water_set_surface( float height )
  49 {
  50    world.water.height = height;
  51    v4_copy( (v4f){ 0.0f, 1.0f, 0.0f, height }, world.water.plane );
  52 }
  53
  54 VG_STATIC void render_water_texture( m4x3f camera )
  55 {
  56    if( !world.water.enabled || (vg.quality_profile == k_quality_profile_low) )
  57       return;
  58
  59    /* Draw reflection buffa */
  60    fb_use( &world.water.fbreflect );
  61    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
  62
  63    m4x3f new_cam, inverse;
  64    v3_copy( camera[3], new_cam[3] );
  65    new_cam[3][1] -= 2.0f * (camera[3][1] - world.water.height);
  66
  67    m3x3f flip;
  68    m3x3_identity( flip );
  69    flip[1][1] = -1.0f;
  70    m3x3_mul( flip, camera, new_cam );
  71
  72
  73    v3f p0;
  74    m3x3_mulv( new_cam, (v3f){0.0f,0.0f,-1.0f}, p0 );
  75    v3_add( new_cam[3], p0, p0 );
  76    vg_line( new_cam[3], p0, 0xffffffff );
  77
  78    m4x4f view;
  79    vg_line_pt3( new_cam[3], 0.3f, 0xff00ffff );
  80
  81    m4x3_invert_affine( new_cam, inverse );
  82    m4x3_expand( inverse, view );
  83
  84    v4f clippa = { 0.0f, 1.0f, 0.0f, world.water.height-0.1f };
  85    m4x3_mulp( inverse, clippa, clippa );
  86    clippa[3] *= -1.0f;
  87
  88    m4x4f projection;
  89    m4x4_projection( projection,
  90          gpipeline.fov,
  91          (float)vg.window_x / (float)vg.window_y,
  92          0.1f, 900.0f );
  93    plane_clip_projection( projection, clippa );
  94    m4x4_mul( projection, view, projection );
  95
  96    glCullFace( GL_FRONT );
  97    render_world( projection, new_cam );
  98    glCullFace( GL_BACK );
  99
 100
 101    /* Draw beneath texture */
 102    fb_use( &world.water.fbdepth );
 103    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
 104
 105    m4x3_invert_affine( camera, inverse );
 106    m4x3_expand( inverse, view );
 107
 108    float bias = -(camera[3][1]-world.water.height)*0.1f;
 109    v4f clippb = { 0.0f, -1.0f, 0.0f, -(world.water.height) + bias };
 110    m4x3_mulp( inverse, clippb, clippb );
 111    clippb[3] *= -1.0f;
 112
 113    m4x4_projection( projection,
 114          gpipeline.fov,
 115          (float)vg.window_x / (float)vg.window_y,
 116          0.1f, 900.0f );
 117
 118    plane_clip_projection( projection, clippb );
 119    m4x4_mul( projection, view, projection );
 120    render_world_depth( projection, camera );
 121
 122    glViewport( 0, 0, vg.window_x, vg.window_y );
 123 }
 124
 125 VG_STATIC void render_water_surface( m4x4f pv, m4x3f camera )
 126 {
 127    if( !world.water.enabled )
 128       return;
 129
 130    if( vg.quality_profile == k_quality_profile_high )
 131    {
 132       /* Draw surface */
 133       shader_water_use();
 134
 135       fb_bindtex( &world.water.fbreflect, 0 );
 136       shader_water_uTexMain( 0 );
 137
 138       vg_tex2d_bind( &tex_water_surf, 1 );
 139       shader_water_uTexDudv( 1 );
 140       shader_water_uInvRes( (v2f){
 141             1.0f / (float)vg.window_x,
 142             1.0f / (float)vg.window_y });
 143
 144       shader_link_standard_ub( _shader_water.id, 2 );
 145
 146       fb_bindtex( &world.water.fbdepth, 3 );
 147       shader_water_uTexBack( 3 );
 148       shader_water_uTime( world.time );
 149       shader_water_uCamera( camera[3] );
 150       shader_water_uSurfaceY( world.water.height );
 151
 152       shader_water_uPv( pv );
 153
 154       m4x3f full;
 155       m4x3_identity( full );
 156       shader_water_uMdl( full );
 157
 158       glEnable(GL_BLEND);
 159       glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 160       glBlendEquation(GL_FUNC_ADD);
 161
 162       mesh_bind( &world.mesh_no_collide );
 163
 164       for( int i=0; i<world.material_count; i++ )
 165       {
 166          struct world_material *mat = &world.materials[i];
 167
 168          if( mat->info.shader == k_shader_water )
 169          {
 170             shader_water_uShoreColour( mat->info.colour );
 171             shader_water_uOceanColour( mat->info.colour1 );
 172
 173             mdl_draw_submesh( &mat->sm_no_collide );
 174          }
 175       }
 176
 177       glDisable(GL_BLEND);
 178    }
 179    else if( vg.quality_profile == k_quality_profile_low )
 180    {
 181       shader_water_fast_use();
 182
 183       vg_tex2d_bind( &tex_water_surf, 1 );
 184       shader_water_fast_uTexDudv( 1 );
 185       shader_water_fast_uTime( world.time );
 186       shader_water_fast_uCamera( camera[3] );
 187       shader_water_fast_uSurfaceY( world.water.height );
 188       shader_link_standard_ub( _shader_water_fast.id, 2 );
 189
 190       m4x3f full;
 191       m4x3_identity( full );
 192       shader_water_fast_uMdl( full );
 193       shader_water_fast_uPv( pv );
 194
 195       glEnable(GL_BLEND);
 196       glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 197       glBlendEquation(GL_FUNC_ADD);
 198
 199       mesh_bind( &world.mesh_no_collide );
 200
 201       for( int i=0; i<world.material_count; i++ )
 202       {
 203          struct world_material *mat = &world.materials[i];
 204
 205          if( mat->info.shader == k_shader_water )
 206          {
 207             shader_water_fast_uShoreColour( mat->info.colour );
 208             shader_water_fast_uOceanColour( mat->info.colour1 );
 209
 210             mdl_draw_submesh( &mat->sm_no_collide );
 211          }
 212       }
 213
 214       glDisable(GL_BLEND);
 215    }
 216 }
 217
 218 #endif /* WATER_H */