Differential D3522 Diff 15899 ps/trunk/source/renderer/VertexBuffer.cpp

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ps/trunk/source/renderer/VertexBuffer.cpp

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#include <algorithm>		#include <algorithm>
#include <iterator>		#include <iterator>

// Absolute maximum (bytewise) size of each GL vertex buffer object.		// Absolute maximum (bytewise) size of each GL vertex buffer object.
// Make it large enough for the maximum feasible mesh size (64K vertexes,		// Make it large enough for the maximum feasible mesh size (64K vertexes,
// 64 bytes per vertex in InstancingModelRenderer).		// 64 bytes per vertex in InstancingModelRenderer).
// TODO: measure what influence this has on performance		// TODO: measure what influence this has on performance
#define MAX_VB_SIZE_BYTES (410241024)		constexpr std::size_t MAX_VB_SIZE_BYTES = 4 * 1024 * 1024;

CVertexBuffer::CVertexBuffer(size_t vertexSize, GLenum usage, GLenum target)		CVertexBuffer::CVertexBuffer(size_t vertexSize, GLenum usage, GLenum target)
		: CVertexBuffer(vertexSize, usage, target, MAX_VB_SIZE_BYTES)
		{
		}

		CVertexBuffer::CVertexBuffer(size_t vertexSize, GLenum usage, GLenum target, size_t maximumBufferSize)
: m_VertexSize(vertexSize), m_Handle(0), m_SysMem(0), m_Usage(usage), m_Target(target), m_HasNeededChunks(false)		: m_VertexSize(vertexSize), m_Handle(0), m_SysMem(0), m_Usage(usage), m_Target(target), m_HasNeededChunks(false)
{		{
size_t size = MAX_VB_SIZE_BYTES;		size_t size = maximumBufferSize;

if (target == GL_ARRAY_BUFFER) // vertex data buffer		if (target == GL_ARRAY_BUFFER) // vertex data buffer
{		{
// We want to store 16-bit indices to any vertex in a buffer, so the		// We want to store 16-bit indices to any vertex in a buffer, so the
// buffer must never be bigger than vertexSize*64K bytes since we can		// buffer must never be bigger than vertexSize*64K bytes since we can
// address at most 64K of them with 16-bit indices		// address at most 64K of them with 16-bit indices
size = std::min(size, vertexSize*65536);		size = std::min(size, vertexSize*65536);
}		}
▲ Show 20 Lines • Show All 294 Lines • ▼ Show 20 Lines	size_t CVertexBuffer::GetBytesReserved() const
return MAX_VB_SIZE_BYTES;		return MAX_VB_SIZE_BYTES;
}		}

size_t CVertexBuffer::GetBytesAllocated() const		size_t CVertexBuffer::GetBytesAllocated() const
{		{
return (m_MaxVertices - m_FreeVertices) * m_VertexSize;		return (m_MaxVertices - m_FreeVertices) * m_VertexSize;
}		}

void CVertexBuffer::DumpStatus()		void CVertexBuffer::DumpStatus() const
{		{
debug_printf("freeverts = %d\n", static_cast<int>(m_FreeVertices));		debug_printf("freeverts = %d\n", static_cast<int>(m_FreeVertices));

size_t maxSize = 0;		size_t maxSize = 0;
for (VBChunk* const& chunk : m_FreeList)		for (VBChunk* const& chunk : m_FreeList)
{		{
debug_printf("free chunk %p: size=%d\n", static_cast<void *>(chunk), static_cast<int>(chunk->m_Count));		debug_printf("free chunk %p: size=%d\n", static_cast<void *>(chunk), static_cast<int>(chunk->m_Count));
maxSize = std::max(chunk->m_Count, maxSize);		maxSize = std::max(chunk->m_Count, maxSize);
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