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/scene_water.h"
  11 #include "shaders/scene_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_scene_water_register();
  20    shader_scene_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( world_instance *world, 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 VG_STATIC void world_link_lighting_ub( world_instance *world, GLuint shader );
  38 VG_STATIC void world_bind_position_texture( world_instance *world,
  39                                             GLuint shader, GLuint location,
  40                                             int slot );
  41
  42 /*
  43  * Does not write motion vectors
  44  */
  45 VG_STATIC void render_water_texture( world_instance *world, camera *cam )
  46 {
  47    if( !world->water.enabled || (vg.quality_profile == k_quality_profile_low) )
  48       return;
  49
  50    /* Draw reflection buffa */
  51    render_fb_bind( gpipeline.fb_water_reflection );
  52    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
  53
  54    /*
  55     * Create flipped view matrix. Don't care about motion vectors
  56     */
  57    float cam_height = cam->transform[3][1] - world->water.height;
  58
  59    camera water_cam;
  60    water_cam.farz = cam->farz;
  61    water_cam.nearz = cam->nearz;
  62    v3_copy( cam->transform[3], water_cam.transform[3] );
  63    water_cam.transform[3][1] -= 2.0f * cam_height;
  64
  65    m3x3f flip;
  66    m3x3_identity( flip );
  67    flip[1][1] = -1.0f;
  68    m3x3_mul( flip, cam->transform, water_cam.transform );
  69
  70    camera_update_view( &water_cam );
  71
  72    /*
  73     * Create clipped projection
  74     */
  75    v4f clippa = { 0.0f, 1.0f, 0.0f, world->water.height-0.1f };
  76    m4x3_mulp( water_cam.transform_inverse, clippa, clippa );
  77    clippa[3] *= -1.0f;
  78
  79    m4x4_copy( cam->mtx.p, water_cam.mtx.p );
  80    m4x4_clip_projection( water_cam.mtx.p, clippa );
  81
  82    camera_finalize( &water_cam );
  83
  84    /*
  85     * Draw world
  86     */
  87    glCullFace( GL_FRONT );
  88    render_world( world, &water_cam );
  89    glCullFace( GL_BACK );
  90
  91    /*
  92     * Create beneath view matrix
  93     */
  94    camera beneath_cam;
  95    render_fb_bind( gpipeline.fb_water_beneath );
  96    glClearColor( 1.0f, 0.0f, 0.0f, 0.0f );
  97    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
  98
  99    m4x3_copy( cam->transform, beneath_cam.transform );
 100    camera_update_view( &beneath_cam );
 101
 102    float bias = -(cam->transform[3][1]-world->water.height)*0.1f;
 103
 104    v4f clippb = { 0.0f, -1.0f, 0.0f, -(world->water.height) + bias };
 105    m4x3_mulp( beneath_cam.transform_inverse, clippb, clippb );
 106    clippb[3] *= -1.0f;
 107
 108    m4x4_copy( cam->mtx.p, beneath_cam.mtx.p );
 109    m4x4_clip_projection( beneath_cam.mtx.p, clippb );
 110    camera_finalize( &beneath_cam );
 111
 112    render_world_depth( world, &beneath_cam );
 113    glViewport( 0, 0, vg.window_x, vg.window_y );
 114 }
 115
 116 VG_STATIC void render_water_surface( world_instance *world, camera *cam )
 117 {
 118    if( !world->water.enabled )
 119       return;
 120
 121    if( vg.quality_profile == k_quality_profile_high )
 122    {
 123       /* Draw surface */
 124       shader_scene_water_use();
 125
 126       render_fb_bind_texture( gpipeline.fb_water_reflection, 0, 0 );
 127       shader_scene_water_uTexMain( 0 );
 128
 129       vg_tex2d_bind( &tex_water_surf, 1 );
 130       shader_scene_water_uTexDudv( 1 );
 131       shader_scene_water_uInvRes( (v2f){
 132             1.0f / (float)vg.window_x,
 133             1.0f / (float)vg.window_y });
 134
 135       world_link_lighting_ub( world, _shader_scene_water.id );
 136       world_bind_position_texture( world, _shader_scene_water.id,
 137                                     _uniform_scene_water_g_world_depth, 2 );
 138
 139       render_fb_bind_texture( gpipeline.fb_water_beneath, 0, 3 );
 140       shader_scene_water_uTexBack( 3 );
 141       shader_scene_water_uTime( world_global.time );
 142       shader_scene_water_uCamera( cam->transform[3] );
 143       shader_scene_water_uSurfaceY( world->water.height );
 144
 145       shader_scene_water_uPv( cam->mtx.pv );
 146       shader_scene_water_uPvmPrev( cam->mtx_prev.pv );
 147
 148       m4x3f full;
 149       m4x3_identity( full );
 150       shader_scene_water_uMdl( full );
 151
 152       glEnable(GL_BLEND);
 153       glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 154       glBlendEquation(GL_FUNC_ADD);
 155
 156       mesh_bind( &world->mesh_no_collide );
 157
 158       for( int i=0; i<world->material_count; i++ )
 159       {
 160          struct world_material *mat = &world->materials[i];
 161
 162          if( mat->info.shader == k_shader_water )
 163          {
 164             shader_scene_water_uShoreColour( mat->info.colour );
 165             shader_scene_water_uOceanColour( mat->info.colour1 );
 166
 167             mdl_draw_submesh( &mat->sm_no_collide );
 168          }
 169       }
 170
 171       glDisable(GL_BLEND);
 172    }
 173    else if( vg.quality_profile == k_quality_profile_low )
 174    {
 175       shader_scene_water_fast_use();
 176
 177       vg_tex2d_bind( &tex_water_surf, 1 );
 178       shader_scene_water_fast_uTexDudv( 1 );
 179       shader_scene_water_fast_uTime( world_global.time );
 180       shader_scene_water_fast_uCamera( cam->transform[3] );
 181       shader_scene_water_fast_uSurfaceY( world->water.height );
 182       world_link_lighting_ub( world, _shader_scene_water_fast.id );
 183       world_bind_position_texture( world, _shader_scene_water_fast.id,
 184                                    _uniform_scene_water_fast_g_world_depth, 2 );
 185
 186       m4x3f full;
 187       m4x3_identity( full );
 188       shader_scene_water_fast_uMdl( full );
 189       shader_scene_water_fast_uPv( cam->mtx.pv );
 190       shader_scene_water_fast_uPvmPrev( cam->mtx_prev.pv );
 191
 192       glEnable(GL_BLEND);
 193       glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 194       glBlendEquation(GL_FUNC_ADD);
 195
 196       mesh_bind( &world->mesh_no_collide );
 197
 198       for( int i=0; i<world->material_count; i++ )
 199       {
 200          struct world_material *mat = &world->materials[i];
 201
 202          if( mat->info.shader == k_shader_water )
 203          {
 204             shader_scene_water_fast_uShoreColour( mat->info.colour );
 205             shader_scene_water_fast_uOceanColour( mat->info.colour1 );
 206
 207             mdl_draw_submesh( &mat->sm_no_collide );
 208          }
 209       }
 210
 211       glDisable(GL_BLEND);
 212    }
 213 }
 214
 215 #endif /* WATER_H */