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The original OpenGL Core changes only used a single vertex array object for specifying the data layout of our vertex data. This uses the OpenGL extension GL_ARB_vertex_attrib_binding to extend that so that each vertex_layout uses a separate vertex array object which should improve performance by reducing the CPU overhead while switching the vertex layout. Since we need to use offsets into the vertex buffers at some points this can not be done with the core functions since those do not support specifying an offset when binding a vertex buffer. GL_ARB_vertex_attrib_binding does support that and also features an improved API for specifying the vertex layout. If that extension is not available then the rendering engine will fall back to the current code. In CPU intensive scenes I observed a frametime improvement of 1-2 ms.
17 lines
237 B
C++
17 lines
237 B
C++
#pragma once
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#include <cstddef>
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#include <functional>
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namespace boost {
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template <class T>
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inline void hash_combine(std::size_t& seed, const T& v)
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{
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std::hash<T> hasher;
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seed ^= hasher(v) + 0x9e3779b9 + (seed<<6) + (seed>>2);
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}
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}
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