137 lines
3.6 KiB
C++
137 lines
3.6 KiB
C++
/**
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This file is a part of our_dick
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Copyright (C) 2020-2022 rexy712
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef OUR_DICK_GRAPHICS_OGL_BUFFER_MAP_HPP
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#define OUR_DICK_GRAPHICS_OGL_BUFFER_MAP_HPP
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#include "gl_include.hpp"
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#include <cstdlib> //size_t, ptrdiff_t
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namespace gfx::ogl{
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namespace buffer{
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//strongly typed enum for different mapping styles
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enum class maptype : GLenum{
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READ = GL_READ_ONLY,
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WRITE = GL_WRITE_ONLY,
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RW = GL_READ_WRITE,
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};
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//strongly typed enum for different usages
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enum class usage : GLenum{
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STATIC_DRAW = GL_STATIC_DRAW,
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DYNAMIC_DRAW = GL_DYNAMIC_DRAW,
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STREAM_DRAW = GL_STREAM_DRAW,
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STATIC_READ = GL_STATIC_READ,
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DYNAMIC_READ = GL_DYNAMIC_READ,
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STREAM_READ = GL_STREAM_READ,
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STATIC_COPY = GL_STATIC_COPY,
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DYNAMIC_COPY = GL_DYNAMIC_COPY,
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STREAM_COPY = GL_STREAM_COPY,
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};
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}
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//RAII wrapper for mapping vbo's
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template<typename T>
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class scoped_buffer_map
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{
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public:
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using value_type = T;
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using size_type = size_t;
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using difference_type = ptrdiff_t;
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using reference = T&;
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using const_reference = const T&;
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using pointer = T*;
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using const_pointer = const T*;
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private:
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pointer m_data = nullptr; //pointer to the mapped region
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GLuint m_buffer;
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public:
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//create a mapping for 'v' on 'targ' with map style 'm'
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explicit scoped_buffer_map(GLuint bid, buffer::maptype m);
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scoped_buffer_map(const scoped_buffer_map&) = delete;
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scoped_buffer_map(scoped_buffer_map&&);
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~scoped_buffer_map(void);
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scoped_buffer_map& operator=(const scoped_buffer_map&) = delete;
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scoped_buffer_map& operator=(scoped_buffer_map&&);
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//size of the mapped region as reported by glGetBufferParameteriv
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size_type length(void)const;
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//release ownership of the mapping. unsafe
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pointer release(void);
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//direct access to the underlaying data region
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operator pointer(void);
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operator const_pointer(void)const;
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pointer raw(void);
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const_pointer raw(void)const;
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bool valid(void)const;
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//indexed access to the data region
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reference operator[](size_type i);
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const_reference operator[](size_type i)const;
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};
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//specialization for void pointers. The same in every way except no subscript operators
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template<>
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class scoped_buffer_map<void>
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{
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public:
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using value_type = void;
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using size_type = size_t;
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using difference_type = ptrdiff_t;
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using reference = void;
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using const_reference = void;
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using pointer = void*;
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using const_pointer = const void*;
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private:
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pointer m_data = nullptr;
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GLuint m_buffer;
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public:
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explicit scoped_buffer_map(GLuint bid, buffer::maptype m);
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scoped_buffer_map(const scoped_buffer_map&) = delete;
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scoped_buffer_map(scoped_buffer_map&&);
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~scoped_buffer_map(void);
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scoped_buffer_map& operator=(const scoped_buffer_map&) = delete;
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scoped_buffer_map& operator=(scoped_buffer_map&&);
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size_type length(void)const;
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pointer release(void);
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operator pointer(void);
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operator const_pointer(void)const;
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pointer raw(void);
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const_pointer raw(void)const;
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bool valid(void)const;
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};
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}
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#include "buffer_map.tpp"
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#endif
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