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 VG_STATIC void world_bind_light_array( world_instance *world,
  42                                        GLuint shader, GLuint location,
  43                                        int slot );
  44 VG_STATIC void world_bind_light_index( world_instance *world,
  45                                        GLuint shader, GLuint location,
  46                                        int slot );
  47
  48 /*
  49  * Does not write motion vectors
  50  */
  51 VG_STATIC void render_water_texture( world_instance *world, camera *cam,
  52                                      int layer_depth )
  53 {
  54    if( !world->water.enabled || (vg.quality_profile == k_quality_profile_low) )
  55       return;
  56
  57    /* Draw reflection buffa */
  58    render_fb_bind( gpipeline.fb_water_reflection );
  59    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
  60
  61    /*
  62     * Create flipped view matrix. Don't care about motion vectors
  63     */
  64    float cam_height = cam->transform[3][1] - world->water.height;
  65
  66    camera water_cam;
  67    water_cam.farz = cam->farz;
  68    water_cam.nearz = cam->nearz;
  69    v3_copy( cam->transform[3], water_cam.transform[3] );
  70    water_cam.transform[3][1] -= 2.0f * cam_height;
  71
  72    m3x3f flip;
  73    m3x3_identity( flip );
  74    flip[1][1] = -1.0f;
  75    m3x3_mul( flip, cam->transform, water_cam.transform );
  76
  77    camera_update_view( &water_cam );
  78
  79    /*
  80     * Create clipped projection
  81     */
  82    v4f clippa = { 0.0f, 1.0f, 0.0f, world->water.height-0.1f };
  83    m4x3_mulp( water_cam.transform_inverse, clippa, clippa );
  84    clippa[3] *= -1.0f;
  85
  86    m4x4_copy( cam->mtx.p, water_cam.mtx.p );
  87    m4x4_clip_projection( water_cam.mtx.p, clippa );
  88
  89    camera_finalize( &water_cam );
  90
  91    /*
  92     * Draw world
  93     */
  94    glEnable( GL_DEPTH_TEST );
  95    glDisable( GL_BLEND );
  96    glCullFace( GL_FRONT );
  97    render_world( world, &water_cam, layer_depth );
  98    glCullFace( GL_BACK );
  99
 100    /*
 101     * Create beneath view matrix
 102     */
 103    camera beneath_cam;
 104    render_fb_bind( gpipeline.fb_water_beneath );
 105    glClearColor( 1.0f, 0.0f, 0.0f, 0.0f );
 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    glEnable( GL_DEPTH_TEST );
 122    glDisable( GL_BLEND );
 123    render_world_depth( world, &beneath_cam );
 124    glViewport( 0,0, g_render_x, g_render_y );
 125 }
 126
 127 VG_STATIC void render_water_surface( world_instance *world, camera *cam )
 128 {
 129    if( !world->water.enabled )
 130       return;
 131
 132    if( vg.quality_profile == k_quality_profile_high ){
 133       /* Draw surface */
 134       shader_scene_water_use();
 135
 136       render_fb_bind_texture( gpipeline.fb_water_reflection, 0, 0 );
 137       shader_scene_water_uTexMain( 0 );
 138
 139       vg_tex2d_bind( &tex_water_surf, 1 );
 140       shader_scene_water_uTexDudv( 1 );
 141       shader_scene_water_uInvRes( (v2f){
 142             1.0f / (float)vg.window_x,
 143             1.0f / (float)vg.window_y });
 144
 145       world_link_lighting_ub( world, _shader_scene_water.id );
 146       world_bind_position_texture( world, _shader_scene_water.id,
 147                                     _uniform_scene_water_g_world_depth, 2 );
 148       world_bind_light_array( world, _shader_scene_water.id,
 149                                     _uniform_scene_water_uLightsArray, 4 );
 150       world_bind_light_index( world, _shader_scene_water.id,
 151                               _uniform_scene_water_uLightsIndex, 5 );
 152
 153       render_fb_bind_texture( gpipeline.fb_water_beneath, 0, 3 );
 154       shader_scene_water_uTexBack( 3 );
 155       shader_scene_water_uTime( world_global.time );
 156       shader_scene_water_uCamera( cam->transform[3] );
 157       shader_scene_water_uSurfaceY( world->water.height );
 158
 159       shader_scene_water_uPv( cam->mtx.pv );
 160       shader_scene_water_uPvmPrev( cam->mtx_prev.pv );
 161
 162       m4x3f full;
 163       m4x3_identity( full );
 164       shader_scene_water_uMdl( full );
 165
 166       glEnable(GL_BLEND);
 167       glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 168       glBlendEquation(GL_FUNC_ADD);
 169
 170       mesh_bind( &world->mesh_no_collide );
 171
 172       for( int i=0; i<world->surface_count; i++ ){
 173          struct world_surface *mat = &world->surfaces[i];
 174
 175          if( mat->info.shader == k_shader_water ){
 176             shader_scene_water_uShoreColour( mat->info.colour );
 177             shader_scene_water_uOceanColour( mat->info.colour1 );
 178
 179             mdl_draw_submesh( &mat->sm_no_collide );
 180          }
 181       }
 182
 183       glDisable(GL_BLEND);
 184    }
 185    else if( vg.quality_profile == k_quality_profile_low ){
 186       shader_scene_water_fast_use();
 187
 188       vg_tex2d_bind( &tex_water_surf, 1 );
 189       shader_scene_water_fast_uTexDudv( 1 );
 190       shader_scene_water_fast_uTime( world_global.time );
 191       shader_scene_water_fast_uCamera( cam->transform[3] );
 192       shader_scene_water_fast_uSurfaceY( world->water.height );
 193       world_link_lighting_ub( world, _shader_scene_water_fast.id );
 194       world_bind_position_texture( world, _shader_scene_water_fast.id,
 195                                    _uniform_scene_water_fast_g_world_depth, 2 );
 196       world_bind_light_array( world, _shader_scene_water_fast.id,
 197                                     _uniform_scene_water_fast_uLightsArray, 4 );
 198
 199       m4x3f full;
 200       m4x3_identity( full );
 201       shader_scene_water_fast_uMdl( full );
 202       shader_scene_water_fast_uPv( cam->mtx.pv );
 203       shader_scene_water_fast_uPvmPrev( cam->mtx_prev.pv );
 204
 205       glEnable(GL_BLEND);
 206       glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 207       glBlendEquation(GL_FUNC_ADD);
 208
 209       mesh_bind( &world->mesh_no_collide );
 210
 211       for( int i=0; i<world->surface_count; i++ ){
 212          struct world_surface *mat = &world->surfaces[i];
 213
 214          if( mat->info.shader == k_shader_water ){
 215             shader_scene_water_fast_uShoreColour( mat->info.colour );
 216             shader_scene_water_fast_uOceanColour( mat->info.colour1 );
 217
 218             mdl_draw_submesh( &mat->sm_no_collide );
 219          }
 220       }
 221
 222       glDisable(GL_BLEND);
 223    }
 224 }
 225
 226 #endif /* WATER_H */