world_water.c

   1 /*
   2  * Copyright (C) 2021-2023 Mt.ZERO Software, Harry Godden - All Rights Reserved
   3  */
   4
   5 #ifndef WATER_C
   6 #define WATER_C
   7
   8 #include "world_water.h"
   9 #include "world_render.h"
  10 #include "render.h"
  11 #include "shaders/scene_water.h"
  12 #include "shaders/scene_water_fast.h"
  13 #include "scene.h"
  14
  15 VG_STATIC void world_water_init(void)
  16 {
  17    vg_info( "world_water_init\n" );
  18    shader_scene_water_register();
  19    shader_scene_water_fast_register();
  20
  21    vg_tex2d_load_qoi_async_file( "textures/water_surf.qoi",
  22                                  VG_TEX2D_LINEAR|VG_TEX2D_REPEAT,
  23                                  &world_water.tex_water_surf );
  24
  25    vg_success( "done\n" );
  26 }
  27
  28 VG_STATIC void water_set_surface( world_instance *world, float height )
  29 {
  30    world->water.height = height;
  31    v4_copy( (v4f){ 0.0f, 1.0f, 0.0f, height }, world->water.plane );
  32 }
  33
  34 VG_STATIC void world_link_lighting_ub( world_instance *world, GLuint shader );
  35 VG_STATIC void world_bind_position_texture( world_instance *world,
  36                                             GLuint shader, GLuint location,
  37                                             int slot );
  38 VG_STATIC void world_bind_light_array( world_instance *world,
  39                                        GLuint shader, GLuint location,
  40                                        int slot );
  41 VG_STATIC void world_bind_light_index( 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                                      int layer_depth )
  50 {
  51    if( !world->water.enabled || (vg.quality_profile == k_quality_profile_low) )
  52       return;
  53
  54    /* Draw reflection buffa */
  55    render_fb_bind( gpipeline.fb_water_reflection, 1 );
  56    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
  57
  58    /*
  59     * Create flipped view matrix. Don't care about motion vectors
  60     */
  61    float cam_height = cam->transform[3][1] - world->water.height;
  62
  63    camera water_cam;
  64    water_cam.farz = cam->farz;
  65    water_cam.nearz = cam->nearz;
  66    v3_copy( cam->transform[3], water_cam.transform[3] );
  67    water_cam.transform[3][1] -= 2.0f * cam_height;
  68
  69    m3x3f flip;
  70    m3x3_identity( flip );
  71    flip[1][1] = -1.0f;
  72    m3x3_mul( flip, cam->transform, water_cam.transform );
  73
  74    camera_update_view( &water_cam );
  75
  76    /*
  77     * Create clipped projection
  78     */
  79    v4f clippa = { 0.0f, 1.0f, 0.0f, world->water.height-0.1f };
  80    m4x3_mulp( water_cam.transform_inverse, clippa, clippa );
  81    clippa[3] *= -1.0f;
  82
  83    m4x4_copy( cam->mtx.p, water_cam.mtx.p );
  84    m4x4_clip_projection( water_cam.mtx.p, clippa );
  85
  86    camera_finalize( &water_cam );
  87
  88    /*
  89     * Draw world
  90     */
  91    glEnable( GL_DEPTH_TEST );
  92    glDisable( GL_BLEND );
  93    glCullFace( GL_FRONT );
  94    render_world( world, &water_cam, layer_depth );
  95    glCullFace( GL_BACK );
  96
  97    /*
  98     * Create beneath view matrix
  99     */
 100    camera beneath_cam;
 101    render_fb_bind( gpipeline.fb_water_beneath, 1 );
 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    glEnable( GL_DEPTH_TEST );
 119    glDisable( GL_BLEND );
 120    render_world_depth( world, &beneath_cam );
 121    //glViewport( 0,0, g_render_x, g_render_y );
 122 }
 123
 124 VG_STATIC void render_water_surface( world_instance *world, camera *cam )
 125 {
 126    if( !world->water.enabled )
 127       return;
 128
 129    if( vg.quality_profile == k_quality_profile_high ){
 130       /* Draw surface */
 131       shader_scene_water_use();
 132
 133       render_fb_bind_texture( gpipeline.fb_water_reflection, 0, 0 );
 134       shader_scene_water_uTexMain( 0 );
 135
 136       glActiveTexture( GL_TEXTURE1 );
 137       glBindTexture( GL_TEXTURE_2D, world_water.tex_water_surf );
 138       shader_scene_water_uTexDudv( 1 );
 139
 140       shader_scene_water_uInvRes( (v2f){
 141             1.0f / (float)vg.window_x,
 142             1.0f / (float)vg.window_y });
 143
 144       world_link_lighting_ub( world, _shader_scene_water.id );
 145       world_bind_position_texture( world, _shader_scene_water.id,
 146                                     _uniform_scene_water_g_world_depth, 2 );
 147       world_bind_light_array( world, _shader_scene_water.id,
 148                                     _uniform_scene_water_uLightsArray, 4 );
 149       world_bind_light_index( world, _shader_scene_water.id,
 150                               _uniform_scene_water_uLightsIndex, 5 );
 151
 152       render_fb_bind_texture( gpipeline.fb_water_beneath, 0, 3 );
 153       shader_scene_water_uTexBack( 3 );
 154       shader_scene_water_uTime( world_static.time );
 155       shader_scene_water_uCamera( cam->transform[3] );
 156       shader_scene_water_uSurfaceY( world->water.height );
 157
 158       shader_scene_water_uPv( cam->mtx.pv );
 159       shader_scene_water_uPvmPrev( cam->mtx_prev.pv );
 160
 161       m4x3f full;
 162       m4x3_identity( full );
 163       shader_scene_water_uMdl( full );
 164
 165       glEnable(GL_BLEND);
 166       glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 167       glBlendEquation(GL_FUNC_ADD);
 168
 169       mesh_bind( &world->mesh_no_collide );
 170
 171       for( int i=0; i<world->surface_count; i++ ){
 172          struct world_surface *mat = &world->surfaces[i];
 173
 174          if( mat->info.shader == k_shader_water ){
 175             shader_scene_water_uShoreColour( mat->info.colour );
 176             shader_scene_water_uOceanColour( mat->info.colour1 );
 177
 178             mdl_draw_submesh( &mat->sm_no_collide );
 179          }
 180       }
 181
 182       glDisable(GL_BLEND);
 183    }
 184    else if( vg.quality_profile == k_quality_profile_low ){
 185       shader_scene_water_fast_use();
 186
 187       glActiveTexture( GL_TEXTURE1 );
 188       glBindTexture( GL_TEXTURE_2D, world_water.tex_water_surf );
 189       shader_scene_water_fast_uTexDudv( 1 );
 190
 191       shader_scene_water_fast_uTime( world_static.time );
 192       shader_scene_water_fast_uCamera( cam->transform[3] );
 193       shader_scene_water_fast_uSurfaceY( world->water.height );
 194       world_link_lighting_ub( world, _shader_scene_water_fast.id );
 195       world_bind_position_texture( world, _shader_scene_water_fast.id,
 196                                    _uniform_scene_water_fast_g_world_depth, 2 );
 197       world_bind_light_array( world, _shader_scene_water_fast.id,
 198                                     _uniform_scene_water_fast_uLightsArray, 4 );
 199
 200       m4x3f full;
 201       m4x3_identity( full );
 202       shader_scene_water_fast_uMdl( full );
 203       shader_scene_water_fast_uPv( cam->mtx.pv );
 204       shader_scene_water_fast_uPvmPrev( cam->mtx_prev.pv );
 205
 206       glEnable(GL_BLEND);
 207       glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 208       glBlendEquation(GL_FUNC_ADD);
 209
 210       mesh_bind( &world->mesh_no_collide );
 211
 212       for( int i=0; i<world->surface_count; i++ ){
 213          struct world_surface *mat = &world->surfaces[i];
 214
 215          if( mat->info.shader == k_shader_water ){
 216             shader_scene_water_fast_uShoreColour( mat->info.colour );
 217             shader_scene_water_fast_uOceanColour( mat->info.colour1 );
 218
 219             mdl_draw_submesh( &mat->sm_no_collide );
 220          }
 221       }
 222
 223       glDisable(GL_BLEND);
 224    }
 225 }
 226
 227 #endif /* WATER_C */