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// Copyright 2021, 2022 Benjamin Barenblat
//
// 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
//
// https://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.
#ifndef GLPLANET_SRC_SCENE_H_
#define GLPLANET_SRC_SCENE_H_
#include <stdint.h>
#include <Eigen/Core>
#include <chrono>
#include "src/gl/buffer.h"
#include "src/gl/draw.h"
#include "src/gl/shader.h"
#include "src/gl/texture.h"
#include "src/gl/vertex_array.h"
#include "third_party/abseil/absl/base/attributes.h"
#include "third_party/date/include/date/date.h"
#include "third_party/date/include/date/tz.h"
namespace glplanet {
// The scene to draw.
//
// This class hangs onto some OpenGL state, so it is thread-hostile.
class Scene final {
public:
struct Options {
// The part of the Earth under the camera, in radians east longitude and
// north latitude.
double longitude_radians;
double latitude_radians;
};
// Constructs a scene. There must be an OpenGL context bound to the current
// thread.
explicit Scene(const Options&);
Scene(Scene&&) noexcept = default;
Scene& operator=(Scene&&) noexcept = default;
// Sets up OpenGL state (binding buffers etc.) such that the scene can be
// drawn.
void SetGlState();
// Actually draws the scene.
void Draw(std::chrono::system_clock::time_point);
private:
void LoadTextures();
void SetUpShaders();
void LoadMesh();
date::month planet_month_;
gl::Texture2d planet_;
gl::Texture2d clouds_;
gl::ShaderProgram program_;
int uniform_mvp_;
int uniform_planet_;
int uniform_clouds_;
int uniform_sun_direction_;
Eigen::Matrix4f mvp_;
gl::VertexArray vao_;
int width_;
int height_;
bool window_size_changed_;
};
} // namespace glplanet
#endif // GLPLANET_SRC_SCENE_H_
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