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 /*
  55  * Does not write motion vectors
  56  */
  57 VG_STATIC void render_water_texture( camera *cam )
  58 {
  59    if( !world.water.enabled || (vg.quality_profile == k_quality_profile_low) )
  60       return;
  61
  62    /* Draw reflection buffa */
  63    fb_use( &world.water.fbreflect );
  64    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
  65
  66    /*
  67     * Create flipped view matrix. Don't care about motion vectors
  68     */
  69    float cam_height = cam->transform[3][1] - world.water.height;
  70
  71    camera water_cam;
  72    v3_copy( cam->transform[3], water_cam.transform[3] );
  73    water_cam.transform[3][1] -= 2.0f * cam_height;
  74
  75    m3x3f flip;
  76    m3x3_identity( flip );
  77    flip[1][1] = -1.0f;
  78    m3x3_mul( flip, cam->transform, water_cam.transform );
  79
  80    camera_update_view( &water_cam );
  81
  82    /*
  83     * Create clipped projection
  84     */
  85    v4f clippa = { 0.0f, 1.0f, 0.0f, world.water.height-0.1f };
  86    m4x3_mulp( water_cam.transform_inverse, clippa, clippa );
  87    clippa[3] *= -1.0f;
  88
  89    m4x4_copy( cam->mtx.p, water_cam.mtx.p );
  90    m4x4_clip_projection( water_cam.mtx.p, clippa );
  91
  92    camera_finalize( &water_cam );
  93
  94    /*
  95     * Draw world
  96     */
  97    glCullFace( GL_FRONT );
  98    render_world( &water_cam );
  99    glCullFace( GL_BACK );
 100
 101    /*
 102     * Create beneath view matrix
 103     */
 104    camera beneath_cam;
 105    fb_use( &world.water.fbdepth );
 106    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
 107
 108    m4x3_copy( cam->transform, beneath_cam.transform );
 109    camera_update_view( &beneath_cam );
 110
 111    float bias = -(cam->transform[3][1]-world.water.height)*0.1f;
 112
 113    v4f clippb = { 0.0f, -1.0f, 0.0f, -(world.water.height) + bias };
 114    m4x3_mulp( beneath_cam.transform_inverse, clippb, clippb );
 115    clippb[3] *= -1.0f;
 116
 117    m4x4_copy( cam->mtx.p, beneath_cam.mtx.p );
 118    m4x4_clip_projection( beneath_cam.mtx.p, clippb );
 119    camera_finalize( &beneath_cam );
 120
 121    render_world_depth( &beneath_cam );
 122    glViewport( 0, 0, vg.window_x, vg.window_y );
 123 }
 124
 125 VG_STATIC void render_water_surface( camera *cam )
 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( cam->transform[3] );
 150       shader_water_uSurfaceY( world.water.height );
 151
 152       shader_water_uPv( cam->mtx.pv );
 153       shader_water_uPvmPrev( cam->mtx_prev.pv );
 154
 155       m4x3f full;
 156       m4x3_identity( full );
 157       shader_water_uMdl( full );
 158
 159       glEnable(GL_BLEND);
 160       glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 161       glBlendEquation(GL_FUNC_ADD);
 162
 163       mesh_bind( &world.mesh_no_collide );
 164
 165       for( int i=0; i<world.material_count; i++ )
 166       {
 167          struct world_material *mat = &world.materials[i];
 168
 169          if( mat->info.shader == k_shader_water )
 170          {
 171             shader_water_uShoreColour( mat->info.colour );
 172             shader_water_uOceanColour( mat->info.colour1 );
 173
 174             mdl_draw_submesh( &mat->sm_no_collide );
 175          }
 176       }
 177
 178       glDisable(GL_BLEND);
 179    }
 180    else if( vg.quality_profile == k_quality_profile_low )
 181    {
 182       shader_water_fast_use();
 183
 184       vg_tex2d_bind( &tex_water_surf, 1 );
 185       shader_water_fast_uTexDudv( 1 );
 186       shader_water_fast_uTime( world.time );
 187       shader_water_fast_uCamera( cam->transform[3] );
 188       shader_water_fast_uSurfaceY( world.water.height );
 189       shader_link_standard_ub( _shader_water_fast.id, 2 );
 190
 191       m4x3f full;
 192       m4x3_identity( full );
 193       shader_water_fast_uMdl( full );
 194       shader_water_fast_uPv( cam->mtx.pv );
 195       shader_water_fast_uPvmPrev( cam->mtx_prev.pv );
 196
 197       glEnable(GL_BLEND);
 198       glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 199       glBlendEquation(GL_FUNC_ADD);
 200
 201       mesh_bind( &world.mesh_no_collide );
 202
 203       for( int i=0; i<world.material_count; i++ )
 204       {
 205          struct world_material *mat = &world.materials[i];
 206
 207          if( mat->info.shader == k_shader_water )
 208          {
 209             shader_water_fast_uShoreColour( mat->info.colour );
 210             shader_water_fast_uOceanColour( mat->info.colour1 );
 211
 212             mdl_draw_submesh( &mat->sm_no_collide );
 213          }
 214       }
 215
 216       glDisable(GL_BLEND);
 217    }
 218 }
 219
 220 #endif /* WATER_H */