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//-----------------------------------------------------------------------------
// Name: lightprobecollection.h
// Developer: Wolfire Games LLC
// Description:
// License: Read below
//-----------------------------------------------------------------------------
//
//
// Copyright 2022 Wolfire Games LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//-----------------------------------------------------------------------------
#pragma once
#include <Math/vec3.h>
#include <Asset/Asset/texture.h>
#include <Graphics/model.h>
#include <opengl.h>
#include <vector>
#include <queue>
struct LightProbe {
int id;
vec3 pos;
bool negative;
vec3 ambient_cube_color[6];
vec3 ambient_cube_color_buf[6]; // Used for calculating second bounce
};
struct TetMesh {
std::vector<vec3> points;
std::vector<int> tet_points;
std::vector<int> neighbors;
std::vector<int> point_id;
int display_id;
};
struct LightProbeUpdateEntry {
int id;
int pass; // 0 for first bounce, 1 for second bounce
};
struct GridLookup {
static const int kMaxGridCells = 1000000;
vec3 bounds[2];
int subdivisions[3];
std::vector<unsigned> cell_tet; // What tetrahedron is closest to the center of each cell
};
class BulletWorld;
class LightProbeCollection {
public:
LightProbeCollection();
~LightProbeCollection();
int AddProbe(const vec3& pos, bool negative, const float* coeff = NULL);
bool MoveProbe(int id, const vec3& pos);
bool SetNegative(int id, bool negative);
bool DeleteProbe(int id);
void Draw(BulletWorld& bw);
void Init();
void Dispose();
int ShaderNumLightProbes();
int ShaderNumTetrahedra();
LightProbe* GetNextProbeToProcess();
// Returns id of tetrahedron containing position,
// and fills interpolated ambient cube color
int GetTetrahedron(const vec3& position, vec3 ambient_cube_color[], int best_guess);
GLuint cube_map_fbo;
TextureRef cube_map;
TextureRef ambient_3d_tex;
std::vector<LightProbe> light_probes;
TetMesh tet_mesh;
LightProbe* GetProbeFromID(int id);
int light_probe_texture_buffer_id;
int light_probe_buffer_object_id;
int grid_texture_buffer_id;
int grid_buffer_object_id;
void UpdateTextureBuffer(BulletWorld& bw);
std::queue<LightProbeUpdateEntry> to_process;
GridLookup grid_lookup;
bool tet_mesh_viz_enabled;
bool show_probes;
bool show_probes_through_walls;
bool probe_lighting_enabled;
bool light_volume_enabled;
int probe_model_id;
private:
bool tet_mesh_needs_update;
int next_id;
void UpdateTetMesh(BulletWorld& bw);
};
static const bool kLightProbeEnabled = true;
static const unsigned int kLightProbeNumCoeffs = 18;
extern bool kLightProbe2pass;
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