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 {
  53    if( !world->water.enabled || (vg.quality_profile == k_quality_profile_low) )
  54       return;
  55
  56    /* Draw reflection buffa */
  57    render_fb_bind( gpipeline.fb_water_reflection );
  58    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
  59
  60    /*
  61     * Create flipped view matrix. Don't care about motion vectors
  62     */
  63    float cam_height = cam->transform[3][1] - world->water.height;
  64
  65    camera water_cam;
  66    water_cam.farz = cam->farz;
  67    water_cam.nearz = cam->nearz;
  68    v3_copy( cam->transform[3], water_cam.transform[3] );
  69    water_cam.transform[3][1] -= 2.0f * cam_height;
  70
  71    m3x3f flip;
  72    m3x3_identity( flip );
  73    flip[1][1] = -1.0f;
  74    m3x3_mul( flip, cam->transform, water_cam.transform );
  75
  76    camera_update_view( &water_cam );
  77
  78    /*
  79     * Create clipped projection
  80     */
  81    v4f clippa = { 0.0f, 1.0f, 0.0f, world->water.height-0.1f };
  82    m4x3_mulp( water_cam.transform_inverse, clippa, clippa );
  83    clippa[3] *= -1.0f;
  84
  85    m4x4_copy( cam->mtx.p, water_cam.mtx.p );
  86    m4x4_clip_projection( water_cam.mtx.p, clippa );
  87
  88    camera_finalize( &water_cam );
  89
  90    /*
  91     * Draw world
  92     */
  93    glCullFace( GL_FRONT );
  94    render_world( world, &water_cam );
  95    glCullFace( GL_BACK );
  96
  97    /*
  98     * Create beneath view matrix
  99     */
 100    camera beneath_cam;
 101    render_fb_bind( gpipeline.fb_water_beneath );
 102    glClearColor( 1.0f, 0.0f, 0.0f, 0.0f );
 103    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
 104
 105    m4x3_copy( cam->transform, beneath_cam.transform );
 106    camera_update_view( &beneath_cam );
 107
 108    float bias = -(cam->transform[3][1]-world->water.height)*0.1f;
 109
 110    v4f clippb = { 0.0f, -1.0f, 0.0f, -(world->water.height) + bias };
 111    m4x3_mulp( beneath_cam.transform_inverse, clippb, clippb );
 112    clippb[3] *= -1.0f;
 113
 114    m4x4_copy( cam->mtx.p, beneath_cam.mtx.p );
 115    m4x4_clip_projection( beneath_cam.mtx.p, clippb );
 116    camera_finalize( &beneath_cam );
 117
 118    render_world_depth( world, &beneath_cam );
 119    glViewport( 0, 0, vg.window_x, vg.window_y );
 120 }
 121
 122 VG_STATIC void render_water_surface( world_instance *world, camera *cam )
 123 {
 124    if( !world->water.enabled )
 125       return;
 126
 127    if( vg.quality_profile == k_quality_profile_high ){
 128       /* Draw surface */
 129       shader_scene_water_use();
 130
 131       render_fb_bind_texture( gpipeline.fb_water_reflection, 0, 0 );
 132       shader_scene_water_uTexMain( 0 );
 133
 134       vg_tex2d_bind( &tex_water_surf, 1 );
 135       shader_scene_water_uTexDudv( 1 );
 136       shader_scene_water_uInvRes( (v2f){
 137             1.0f / (float)vg.window_x,
 138             1.0f / (float)vg.window_y });
 139
 140       world_link_lighting_ub( world, _shader_scene_water.id );
 141       world_bind_position_texture( world, _shader_scene_water.id,
 142                                     _uniform_scene_water_g_world_depth, 2 );
 143       world_bind_light_array( world, _shader_scene_water.id,
 144                                     _uniform_scene_water_uLightsArray, 4 );
 145       world_bind_light_index( world, _shader_scene_water.id,
 146                               _uniform_scene_water_uLightsIndex, 5 );
 147
 148       render_fb_bind_texture( gpipeline.fb_water_beneath, 0, 3 );
 149       shader_scene_water_uTexBack( 3 );
 150       shader_scene_water_uTime( world_global.time );
 151       shader_scene_water_uCamera( cam->transform[3] );
 152       shader_scene_water_uSurfaceY( world->water.height );
 153
 154       shader_scene_water_uPv( cam->mtx.pv );
 155       shader_scene_water_uPvmPrev( cam->mtx_prev.pv );
 156
 157       m4x3f full;
 158       m4x3_identity( full );
 159       shader_scene_water_uMdl( full );
 160
 161       glEnable(GL_BLEND);
 162       glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 163       glBlendEquation(GL_FUNC_ADD);
 164
 165       mesh_bind( &world->mesh_no_collide );
 166
 167       for( int i=0; i<world->surface_count; i++ ){
 168          struct world_surface *mat = &world->surfaces[i];
 169
 170          if( mat->info.shader == k_shader_water ){
 171             shader_scene_water_uShoreColour( mat->info.colour );
 172             shader_scene_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       shader_scene_water_fast_use();
 182
 183       vg_tex2d_bind( &tex_water_surf, 1 );
 184       shader_scene_water_fast_uTexDudv( 1 );
 185       shader_scene_water_fast_uTime( world_global.time );
 186       shader_scene_water_fast_uCamera( cam->transform[3] );
 187       shader_scene_water_fast_uSurfaceY( world->water.height );
 188       world_link_lighting_ub( world, _shader_scene_water_fast.id );
 189       world_bind_position_texture( world, _shader_scene_water_fast.id,
 190                                    _uniform_scene_water_fast_g_world_depth, 2 );
 191       world_bind_light_array( world, _shader_scene_water_fast.id,
 192                                     _uniform_scene_water_fast_uLightsArray, 4 );
 193
 194       m4x3f full;
 195       m4x3_identity( full );
 196       shader_scene_water_fast_uMdl( full );
 197       shader_scene_water_fast_uPv( cam->mtx.pv );
 198       shader_scene_water_fast_uPvmPrev( cam->mtx_prev.pv );
 199
 200       glEnable(GL_BLEND);
 201       glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 202       glBlendEquation(GL_FUNC_ADD);
 203
 204       mesh_bind( &world->mesh_no_collide );
 205
 206       for( int i=0; i<world->surface_count; i++ ){
 207          struct world_surface *mat = &world->surfaces[i];
 208
 209          if( mat->info.shader == k_shader_water ){
 210             shader_scene_water_fast_uShoreColour( mat->info.colour );
 211             shader_scene_water_fast_uOceanColour( mat->info.colour1 );
 212
 213             mdl_draw_submesh( &mat->sm_no_collide );
 214          }
 215       }
 216
 217       glDisable(GL_BLEND);
 218    }
 219 }
 220
 221 #endif /* WATER_H */