mirror of
https://github.com/MaSzyna-EU07/maszyna.git
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330 lines
11 KiB
C++
330 lines
11 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 <vector>
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#include <glm/glm.hpp>
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#include <glm/gtc/type_ptr.hpp>
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#include "GL/glew.h"
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#ifdef _WIN32
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#include "GL/wglew.h"
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#endif
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#include "ResourceManager.h"
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namespace gfx {
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struct basic_vertex {
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glm::vec3 position; // 3d space
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glm::vec3 normal; // 3d space
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glm::vec2 texture; // uv space
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basic_vertex() = default;
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basic_vertex( glm::vec3 Position, glm::vec3 Normal, glm::vec2 Texture ) :
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position( Position ), normal( Normal ), texture( Texture )
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{}
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void serialize( std::ostream& ) const;
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void deserialize( std::istream& );
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};
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// data streams carried in a vertex
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enum stream {
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none = 0x0,
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position = 0x1,
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normal = 0x2,
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color = 0x4, // currently normal and colour streams are stored in the same slot, and mutually exclusive
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texture = 0x8
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};
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unsigned int const basic_streams { stream::position | stream::normal | stream::texture };
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unsigned int const color_streams { stream::position | stream::color | stream::texture };
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struct stream_units {
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std::vector<GLint> texture { GL_TEXTURE0 }; // unit associated with main texture data stream. TODO: allow multiple units per stream
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};
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using vertex_array = std::vector<basic_vertex>;
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// generic geometry bank class, allows storage, update and drawing of geometry chunks
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struct geometry_handle {
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// constructors
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geometry_handle() :
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bank( 0 ), chunk( 0 )
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{}
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geometry_handle( std::uint32_t Bank, std::uint32_t Chunk ) :
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bank( Bank ), chunk( Chunk )
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{}
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// methods
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inline
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operator std::uint64_t() const {
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/*
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return bank << 14 | chunk; }
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*/
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return ( std::uint64_t { bank } << 32 | chunk );
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}
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// members
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/*
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std::uint32_t
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bank : 18, // 250k banks
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chunk : 14; // 16k chunks per bank
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*/
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std::uint32_t bank;
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std::uint32_t chunk;
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};
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class geometry_bank {
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public:
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// types:
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// constructors:
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// destructor:
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virtual
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~geometry_bank() {}
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// methods:
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// creates a new geometry chunk of specified type from supplied vertex data. returns: handle to the chunk or NULL
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gfx::geometry_handle
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create( gfx::vertex_array &Vertices, unsigned int const Type );
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// replaces data of specified chunk with the supplied vertex data, starting from specified offset
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bool
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replace( gfx::vertex_array &Vertices, gfx::geometry_handle const &Geometry, std::size_t const Offset = 0 );
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// adds supplied vertex data at the end of specified chunk
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bool
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append( gfx::vertex_array &Vertices, gfx::geometry_handle const &Geometry );
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// draws geometry stored in specified chunk
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void
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draw( gfx::geometry_handle const &Geometry, gfx::stream_units const &Units, unsigned int const Streams = basic_streams );
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// draws geometry stored in supplied list of chunks
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template <typename Iterator_>
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void
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draw( Iterator_ First, Iterator_ Last, gfx::stream_units const &Units, unsigned int const Streams = basic_streams ) { while( First != Last ) { draw( *First, Units, Streams ); ++First; } }
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// frees subclass-specific resources associated with the bank, typically called when the bank wasn't in use for a period of time
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void
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release();
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// provides direct access to vertex data of specfied chunk
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gfx::vertex_array const &
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vertices( gfx::geometry_handle const &Geometry ) const;
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protected:
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// types:
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struct geometry_chunk {
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unsigned int type; // kind of geometry used by the chunk
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gfx::vertex_array vertices; // geometry data
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// NOTE: constructor doesn't copy provided vertex data, but moves it
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geometry_chunk( gfx::vertex_array &Vertices, unsigned int Type ) :
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type( Type )
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{
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vertices.swap( Vertices );
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}
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};
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using geometrychunk_sequence = std::vector<geometry_chunk>;
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// methods
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inline
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geometry_chunk &
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chunk( gfx::geometry_handle const Geometry ) {
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return m_chunks[ Geometry.chunk - 1 ]; }
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inline
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geometry_chunk const &
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chunk( gfx::geometry_handle const Geometry ) const {
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return m_chunks[ Geometry.chunk - 1 ]; }
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// members:
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geometrychunk_sequence m_chunks;
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private:
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// methods:
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// create() subclass details
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virtual void create_( gfx::geometry_handle const &Geometry ) = 0;
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// replace() subclass details
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virtual void replace_( gfx::geometry_handle const &Geometry ) = 0;
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// draw() subclass details
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virtual void draw_( gfx::geometry_handle const &Geometry, gfx::stream_units const &Units, unsigned int const Streams ) = 0;
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// resource release subclass details
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virtual void release_() = 0;
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};
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// opengl vbo-based variant of the geometry bank
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class opengl_vbogeometrybank : public geometry_bank {
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public:
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// constructors:
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opengl_vbogeometrybank() = default;
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// destructor
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~opengl_vbogeometrybank() {
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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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m_activebuffer = 0;
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m_activestreams = gfx::stream::none; }
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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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using chunkrecord_sequence = std::vector<chunk_record>;
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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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bind_buffer();
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void
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delete_buffer();
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static
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void
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bind_streams( gfx::stream_units const &Units, unsigned int const Streams );
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static
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void
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release_streams();
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// members:
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static GLuint m_activebuffer; // buffer bound currently on the opengl end, if any
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static unsigned int m_activestreams;
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static std::vector<GLint> m_activetexturearrays;
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GLuint m_buffer { 0 }; // id of the buffer holding data on the opengl end
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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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};
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// opengl display list based variant of the geometry bank
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class opengl_dlgeometrybank : public geometry_bank {
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public:
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// constructors:
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opengl_dlgeometrybank() = default;
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// destructor:
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~opengl_dlgeometrybank() {
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for( auto &chunkrecord : m_chunkrecords ) {
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::glDeleteLists( chunkrecord.list, 1 ); } }
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private:
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// types:
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struct chunk_record {
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GLuint list { 0 }; // display list associated with the chunk
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unsigned int streams { 0 }; // stream combination used to generate the display list
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};
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using chunkrecord_sequence = std::vector<chunk_record>;
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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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delete_list( gfx::geometry_handle const &Geometry );
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// members:
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chunkrecord_sequence m_chunkrecords; // helper data for all stored geometry chunks, in matching order
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};
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// geometry bank manager, holds collection of geometry banks
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using geometrybank_handle = geometry_handle;
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class geometrybank_manager {
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public:
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// constructors
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geometrybank_manager() = default;
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// methods:
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// performs a resource sweep
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void update();
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// creates a new geometry bank. returns: handle to the bank or NULL
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gfx::geometrybank_handle
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create_bank();
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// creates a new geometry chunk of specified type from supplied vertex data, in specified bank. returns: handle to the chunk or NULL
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gfx::geometry_handle
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create_chunk( gfx::vertex_array &Vertices, gfx::geometrybank_handle const &Geometry, int const Type );
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// replaces data of specified chunk with the supplied vertex data, starting from specified offset
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bool
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replace( gfx::vertex_array &Vertices, gfx::geometry_handle const &Geometry, std::size_t const Offset = 0 );
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// adds supplied vertex data at the end of specified chunk
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bool
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append( gfx::vertex_array &Vertices, gfx::geometry_handle const &Geometry );
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// draws geometry stored in specified chunk
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void
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draw( gfx::geometry_handle const &Geometry, unsigned int const Streams = basic_streams );
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template <typename Iterator_>
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void
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draw( Iterator_ First, Iterator_ Last, unsigned int const Streams = basic_streams ) {
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while( First != Last ) {
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draw( *First, Streams );
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++First; } }
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// provides direct access to vertex data of specfied chunk
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gfx::vertex_array const &
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vertices( gfx::geometry_handle const &Geometry ) const;
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// sets target texture unit for the texture data stream
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gfx::stream_units &
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units() { return m_units; }
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private:
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// types:
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using geometrybanktimepoint_pair = std::pair< std::shared_ptr<geometry_bank>, resource_timestamp >;
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using geometrybanktimepointpair_sequence = std::deque< geometrybanktimepoint_pair >;
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// members:
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geometrybanktimepointpair_sequence m_geometrybanks;
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garbage_collector<geometrybanktimepointpair_sequence> m_garbagecollector { m_geometrybanks, 60, 120, "geometry buffer" };
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gfx::stream_units m_units;
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// methods
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inline
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bool
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valid( gfx::geometry_handle const &Geometry ) const {
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return ( ( Geometry.bank != 0 )
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&& ( Geometry.bank <= m_geometrybanks.size() ) ); }
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inline
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geometrybanktimepointpair_sequence::value_type &
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bank( gfx::geometry_handle const Geometry ) {
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return m_geometrybanks[ Geometry.bank - 1 ]; }
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inline
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geometrybanktimepointpair_sequence::value_type const &
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bank( gfx::geometry_handle const Geometry ) const {
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return m_geometrybanks[ Geometry.bank - 1 ]; }
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};
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} // namespace gfx
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