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
  45 /*
  46  * Does not write motion vectors
  47  */
  48 VG_STATIC void render_water_texture( world_instance *world, camera *cam )
  49 {
  50    if( !world->water.enabled || (vg.quality_profile == k_quality_profile_low) )
  51       return;
  52
  53    /* Draw reflection buffa */
  54    render_fb_bind( gpipeline.fb_water_reflection );
  55    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
  56
  57    /*
  58     * Create flipped view matrix. Don't care about motion vectors
  59     */
  60    float cam_height = cam->transform[3][1] - world->water.height;
  61
  62    camera water_cam;
  63    water_cam.farz = cam->farz;
  64    water_cam.nearz = cam->nearz;
  65    v3_copy( cam->transform[3], water_cam.transform[3] );
  66    water_cam.transform[3][1] -= 2.0f * cam_height;
  67
  68    m3x3f flip;
  69    m3x3_identity( flip );
  70    flip[1][1] = -1.0f;
  71    m3x3_mul( flip, cam->transform, water_cam.transform );
  72
  73    camera_update_view( &water_cam );
  74
  75    /*
  76     * Create clipped projection
  77     */
  78    v4f clippa = { 0.0f, 1.0f, 0.0f, world->water.height-0.1f };
  79    m4x3_mulp( water_cam.transform_inverse, clippa, clippa );
  80    clippa[3] *= -1.0f;
  81
  82    m4x4_copy( cam->mtx.p, water_cam.mtx.p );
  83    m4x4_clip_projection( water_cam.mtx.p, clippa );
  84
  85    camera_finalize( &water_cam );
  86
  87    /*
  88     * Draw world
  89     */
  90    glCullFace( GL_FRONT );
  91    render_world( world, &water_cam );
  92    glCullFace( GL_BACK );
  93
  94    /*
  95     * Create beneath view matrix
  96     */
  97    camera beneath_cam;
  98    render_fb_bind( gpipeline.fb_water_beneath );
  99    glClearColor( 1.0f, 0.0f, 0.0f, 0.0f );
 100    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
 101
 102    m4x3_copy( cam->transform, beneath_cam.transform );
 103    camera_update_view( &beneath_cam );
 104
 105    float bias = -(cam->transform[3][1]-world->water.height)*0.1f;
 106
 107    v4f clippb = { 0.0f, -1.0f, 0.0f, -(world->water.height) + bias };
 108    m4x3_mulp( beneath_cam.transform_inverse, clippb, clippb );
 109    clippb[3] *= -1.0f;
 110
 111    m4x4_copy( cam->mtx.p, beneath_cam.mtx.p );
 112    m4x4_clip_projection( beneath_cam.mtx.p, clippb );
 113    camera_finalize( &beneath_cam );
 114
 115    render_world_depth( world, &beneath_cam );
 116    glViewport( 0, 0, vg.window_x, vg.window_y );
 117 }
 118
 119 VG_STATIC void render_water_surface( world_instance *world, camera *cam )
 120 {
 121    if( !world->water.enabled )
 122       return;
 123
 124    if( vg.quality_profile == k_quality_profile_high )
 125    {
 126       /* Draw surface */
 127       shader_scene_water_use();
 128
 129       render_fb_bind_texture( gpipeline.fb_water_reflection, 0, 0 );
 130       shader_scene_water_uTexMain( 0 );
 131
 132       vg_tex2d_bind( &tex_water_surf, 1 );
 133       shader_scene_water_uTexDudv( 1 );
 134       shader_scene_water_uInvRes( (v2f){
 135             1.0f / (float)vg.window_x,
 136             1.0f / (float)vg.window_y });
 137
 138       world_link_lighting_ub( world, _shader_scene_water.id );
 139       world_bind_position_texture( world, _shader_scene_water.id,
 140                                     _uniform_scene_water_g_world_depth, 2 );
 141       world_bind_light_array( world, _shader_scene_water.id,
 142                                     _uniform_scene_water_uLightsArray, 4 );
 143
 144       render_fb_bind_texture( gpipeline.fb_water_beneath, 0, 3 );
 145       shader_scene_water_uTexBack( 3 );
 146       shader_scene_water_uTime( world_global.time );
 147       shader_scene_water_uCamera( cam->transform[3] );
 148       shader_scene_water_uSurfaceY( world->water.height );
 149
 150       shader_scene_water_uPv( cam->mtx.pv );
 151       shader_scene_water_uPvmPrev( cam->mtx_prev.pv );
 152
 153       m4x3f full;
 154       m4x3_identity( full );
 155       shader_scene_water_uMdl( full );
 156
 157       glEnable(GL_BLEND);
 158       glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 159       glBlendEquation(GL_FUNC_ADD);
 160
 161       mesh_bind( &world->mesh_no_collide );
 162
 163       for( int i=0; i<world->material_count; i++ )
 164       {
 165          struct world_material *mat = &world->materials[i];
 166
 167          if( mat->info.shader == k_shader_water )
 168          {
 169             shader_scene_water_uShoreColour( mat->info.colour );
 170             shader_scene_water_uOceanColour( mat->info.colour1 );
 171
 172             mdl_draw_submesh( &mat->sm_no_collide );
 173          }
 174       }
 175
 176       glDisable(GL_BLEND);
 177    }
 178    else if( vg.quality_profile == k_quality_profile_low )
 179    {
 180       shader_scene_water_fast_use();
 181
 182       vg_tex2d_bind( &tex_water_surf, 1 );
 183       shader_scene_water_fast_uTexDudv( 1 );
 184       shader_scene_water_fast_uTime( world_global.time );
 185       shader_scene_water_fast_uCamera( cam->transform[3] );
 186       shader_scene_water_fast_uSurfaceY( world->water.height );
 187       world_link_lighting_ub( world, _shader_scene_water_fast.id );
 188       world_bind_position_texture( world, _shader_scene_water_fast.id,
 189                                    _uniform_scene_water_fast_g_world_depth, 2 );
 190       world_bind_light_array( world, _shader_scene_water_fast.id,
 191                                     _uniform_scene_water_fast_uLightsArray, 4 );
 192
 193       m4x3f full;
 194       m4x3_identity( full );
 195       shader_scene_water_fast_uMdl( full );
 196       shader_scene_water_fast_uPv( cam->mtx.pv );
 197       shader_scene_water_fast_uPvmPrev( cam->mtx_prev.pv );
 198
 199       glEnable(GL_BLEND);
 200       glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 201       glBlendEquation(GL_FUNC_ADD);
 202
 203       mesh_bind( &world->mesh_no_collide );
 204
 205       for( int i=0; i<world->material_count; i++ )
 206       {
 207          struct world_material *mat = &world->materials[i];
 208
 209          if( mat->info.shader == k_shader_water )
 210          {
 211             shader_scene_water_fast_uShoreColour( mat->info.colour );
 212             shader_scene_water_fast_uOceanColour( mat->info.colour1 );
 213
 214             mdl_draw_submesh( &mat->sm_no_collide );
 215          }
 216       }
 217
 218       glDisable(GL_BLEND);
 219    }
 220 }
 221
 222 #endif /* WATER_H */