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       vg_tex2d_init( (vg_tex2d *[]){&tex_water_surf}, 1 );
  25    }
  26    vg_release_thread_sync();
  27
  28    vg_success( "done\n" );
  29 }
  30
  31 VG_STATIC void water_set_surface( float height )
  32 {
  33    world.water.height = height;
  34    v4_copy( (v4f){ 0.0f, 1.0f, 0.0f, height }, world.water.plane );
  35 }
  36
  37 /*
  38  * Does not write motion vectors
  39  */
  40 VG_STATIC void render_water_texture( camera *cam )
  41 {
  42    if( !world.water.enabled || (vg.quality_profile == k_quality_profile_low) )
  43       return;
  44
  45    /* Draw reflection buffa */
  46    render_fb_bind( gpipeline.fb_water_reflection );
  47    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
  48
  49    /*
  50     * Create flipped view matrix. Don't care about motion vectors
  51     */
  52    float cam_height = cam->transform[3][1] - world.water.height;
  53
  54    camera water_cam;
  55    water_cam.farz = cam->farz;
  56    water_cam.nearz = cam->nearz;
  57    v3_copy( cam->transform[3], water_cam.transform[3] );
  58    water_cam.transform[3][1] -= 2.0f * cam_height;
  59
  60    m3x3f flip;
  61    m3x3_identity( flip );
  62    flip[1][1] = -1.0f;
  63    m3x3_mul( flip, cam->transform, water_cam.transform );
  64
  65    camera_update_view( &water_cam );
  66
  67    /*
  68     * Create clipped projection
  69     */
  70    v4f clippa = { 0.0f, 1.0f, 0.0f, world.water.height-0.1f };
  71    m4x3_mulp( water_cam.transform_inverse, clippa, clippa );
  72    clippa[3] *= -1.0f;
  73
  74    m4x4_copy( cam->mtx.p, water_cam.mtx.p );
  75    m4x4_clip_projection( water_cam.mtx.p, clippa );
  76
  77    camera_finalize( &water_cam );
  78
  79    /*
  80     * Draw world
  81     */
  82    glCullFace( GL_FRONT );
  83    render_world( &water_cam );
  84    glCullFace( GL_BACK );
  85
  86    /*
  87     * Create beneath view matrix
  88     */
  89    camera beneath_cam;
  90    render_fb_bind( gpipeline.fb_water_beneath );
  91    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
  92
  93    m4x3_copy( cam->transform, beneath_cam.transform );
  94    camera_update_view( &beneath_cam );
  95
  96    float bias = -(cam->transform[3][1]-world.water.height)*0.1f;
  97
  98    v4f clippb = { 0.0f, -1.0f, 0.0f, -(world.water.height) + bias };
  99    m4x3_mulp( beneath_cam.transform_inverse, clippb, clippb );
 100    clippb[3] *= -1.0f;
 101
 102    m4x4_copy( cam->mtx.p, beneath_cam.mtx.p );
 103    m4x4_clip_projection( beneath_cam.mtx.p, clippb );
 104    camera_finalize( &beneath_cam );
 105
 106    render_world_depth( &beneath_cam );
 107    glViewport( 0, 0, vg.window_x, vg.window_y );
 108 }
 109
 110 VG_STATIC void render_water_surface( camera *cam )
 111 {
 112    if( !world.water.enabled )
 113       return;
 114
 115    if( vg.quality_profile == k_quality_profile_high )
 116    {
 117       /* Draw surface */
 118       shader_water_use();
 119
 120       render_fb_bind_texture( gpipeline.fb_water_reflection, 0, 0 );
 121       shader_water_uTexMain( 0 );
 122
 123       vg_tex2d_bind( &tex_water_surf, 1 );
 124       shader_water_uTexDudv( 1 );
 125       shader_water_uInvRes( (v2f){
 126             1.0f / (float)vg.window_x,
 127             1.0f / (float)vg.window_y });
 128
 129       shader_link_standard_ub( _shader_water.id, 2 );
 130
 131       render_fb_bind_texture( gpipeline.fb_water_beneath, 0, 3 );
 132       shader_water_uTexBack( 3 );
 133       shader_water_uTime( world.time );
 134       shader_water_uCamera( cam->transform[3] );
 135       shader_water_uSurfaceY( world.water.height );
 136
 137       shader_water_uPv( cam->mtx.pv );
 138       shader_water_uPvmPrev( cam->mtx_prev.pv );
 139
 140       m4x3f full;
 141       m4x3_identity( full );
 142       shader_water_uMdl( full );
 143
 144       glEnable(GL_BLEND);
 145       glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 146       glBlendEquation(GL_FUNC_ADD);
 147
 148       mesh_bind( &world.mesh_no_collide );
 149
 150       for( int i=0; i<world.material_count; i++ )
 151       {
 152          struct world_material *mat = &world.materials[i];
 153
 154          if( mat->info.shader == k_shader_water )
 155          {
 156             shader_water_uShoreColour( mat->info.colour );
 157             shader_water_uOceanColour( mat->info.colour1 );
 158
 159             mdl_draw_submesh( &mat->sm_no_collide );
 160          }
 161       }
 162
 163       glDisable(GL_BLEND);
 164    }
 165    else if( vg.quality_profile == k_quality_profile_low )
 166    {
 167       shader_water_fast_use();
 168
 169       vg_tex2d_bind( &tex_water_surf, 1 );
 170       shader_water_fast_uTexDudv( 1 );
 171       shader_water_fast_uTime( world.time );
 172       shader_water_fast_uCamera( cam->transform[3] );
 173       shader_water_fast_uSurfaceY( world.water.height );
 174       shader_link_standard_ub( _shader_water_fast.id, 2 );
 175
 176       m4x3f full;
 177       m4x3_identity( full );
 178       shader_water_fast_uMdl( full );
 179       shader_water_fast_uPv( cam->mtx.pv );
 180       shader_water_fast_uPvmPrev( cam->mtx_prev.pv );
 181
 182       glEnable(GL_BLEND);
 183       glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 184       glBlendEquation(GL_FUNC_ADD);
 185
 186       mesh_bind( &world.mesh_no_collide );
 187
 188       for( int i=0; i<world.material_count; i++ )
 189       {
 190          struct world_material *mat = &world.materials[i];
 191
 192          if( mat->info.shader == k_shader_water )
 193          {
 194             shader_water_fast_uShoreColour( mat->info.colour );
 195             shader_water_fast_uOceanColour( mat->info.colour1 );
 196
 197             mdl_draw_submesh( &mat->sm_no_collide );
 198          }
 199       }
 200
 201       glDisable(GL_BLEND);
 202    }
 203 }
 204
 205 #endif /* WATER_H */