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