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https://github.com/MaSzyna-EU07/maszyna.git
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61 lines
1.9 KiB
C++
61 lines
1.9 KiB
C++
/*
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This Source Code Form is subject to the
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terms of the Mozilla Public License, v.
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2.0. If a copy of the MPL was not
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distributed with this file, You can
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obtain one at
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http://mozilla.org/MPL/2.0/.
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*/
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#pragma once
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#include <array>
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#include <functional>
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#include <memory>
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#include <unordered_map>
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#include <glm/glm.hpp>
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#include "rendering/common/grassfield.h"
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#include "gl/shader.h"
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#include "gl/vao.h"
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class opengl_camera;
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// grass of the heightmap terrain for the opengl 4.6 renderer (gfx::grass_field): the textures of the chunks, and the draws of
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// the tiles seen, instances of a blade made up by grass.vert
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class opengl46_grass : public gfx::grass_field
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{
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public:
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opengl46_grass() = default;
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~opengl46_grass() override;
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// draws the grass seen by the camera. View: the modelview of the pass with the camera at its origin; Modelview: hands a
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// modelview to the model block of the draws which follow. returns: triangles drawn
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std::size_t render(opengl_camera const &Camera, glm::mat4 const &View, std::function<void(glm::mat4 const &)> const &Modelview);
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protected:
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void gpu_upload(std::uint64_t const Id, gfx::grass_chunk const &Source) override;
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void gpu_release(std::uint64_t const Id) override;
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private:
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struct chunk_textures
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{
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GLuint heights{0}; // R32F, the grid points
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GLuint density{0}; // RGBA8, the densities of the kinds
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GLuint holes{0}; // R8, a single texel of 0 without holes
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};
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bool init();
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int m_state{0}; // 0: not set up yet, 1: ready, -1: can't be used
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std::unique_ptr<gl::program> m_program;
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std::unique_ptr<gl::vao> m_vao; // without attributes, the blades are made of the numbers of their vertices
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std::unordered_map<std::uint64_t, chunk_textures> m_textures;
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// locations of the uniforms of the program
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struct locations
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{
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GLint tile{-1}, part{-1}, chunk{-1}, camera{-1}, lod{-1}, wind{-1};
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GLint base{-1}, tip{-1}, shape{-1}, share{-1}, dry{-1}, season{-1};
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} m_uniforms;
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};
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