diff options
author | Benjamin Barenblat <bbarenblat@gmail.com> | 2022-01-17 23:12:32 -0500 |
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committer | Benjamin Barenblat <bbarenblat@gmail.com> | 2022-01-30 15:55:27 -0500 |
commit | d0e18bdb7924c71cdca8dd983711171d87ef28be (patch) | |
tree | 6be11aae0b7c8874e6507b75b4ef26d1353952c7 /src/scene.h |
glplanet draws Earth like it currently appears from space, putting
nighttime areas in shadow and daytime areas in light. It’s modeled
after Xplanet (http://xplanet.sourceforge.net/), but whereas Xplanet is
entirely a CPU-resident program, glplanet draws using OpenGL. It’s thus
much less resource-intensive, particularly when using high-resolution
textures.
Diffstat (limited to 'src/scene.h')
-rw-r--r-- | src/scene.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/src/scene.h b/src/scene.h new file mode 100644 index 0000000..36da1e0 --- /dev/null +++ b/src/scene.h @@ -0,0 +1,87 @@ +// 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_ |