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https://github.com/MaSzyna-EU07/maszyna.git
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72 lines
2.0 KiB
C++
72 lines
2.0 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 "geometrybank.h"
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#include "gl/buffer.h"
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#include "gl/vao.h"
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namespace gfx {
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// opengl vao/vbo-based variant of the geometry bank
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class opengl33_vaogeometrybank : public geometry_bank {
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public:
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// constructors:
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opengl33_vaogeometrybank() = default;
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// destructor
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~opengl33_vaogeometrybank() {
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delete_buffer(); }
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// methods:
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static
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void
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reset() {;}
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private:
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// types:
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struct chunk_record{
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std::size_t offset{ 0 }; // beginning of the chunk data as offset from the beginning of the last established buffer
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std::size_t size{ 0 }; // size of the chunk in the last established buffer
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bool is_good{ false }; // true if local content of the chunk matches the data on the opengl end
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};
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typedef std::vector<chunk_record> chunkrecord_sequence;
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// methods:
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// create() subclass details
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void
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create_( gfx::geometry_handle const &Geometry ) override;
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// replace() subclass details
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void
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replace_( gfx::geometry_handle const &Geometry ) override;
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// draw() subclass details
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void
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draw_( gfx::geometry_handle const &Geometry, gfx::stream_units const &Units, unsigned int const Streams ) override;
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// release() subclass details
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void
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release_() override;
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void
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setup_buffer();
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void
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delete_buffer();
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// members:
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std::optional<gl::buffer> m_buffer; // buffer data on the opengl end
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std::optional<gl::vao> m_vao;
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std::size_t m_buffercapacity{ 0 }; // total capacity of the last established buffer
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chunkrecord_sequence m_chunkrecords; // helper data for all stored geometry chunks, in matching order
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// vectors for glMultiDrawArrays in class scope
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// to don't waste time on reallocating
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std::vector<GLint> m_offsets;
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std::vector<GLsizei> m_counts;
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};
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} // namespace gfx
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