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Optimized hardware buffers 

Former-commit-id: 59f96166fb259137b5e0445eb5faa0b912b0f29c
This commit is contained in:
Lynix 2014-04-20 22:32:09 +02:00
parent c45e22ff7d
commit 70e57a338f
2 changed files with 30 additions and 73 deletions
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85
src/Nazara/Renderer/HardwareBuffer.cpp
View File

@ -11,53 +11,6 @@
#include <stdexcept>
#include <Nazara/Renderer/Debug.hpp>
namespace
{
using LockRoutine = nzUInt8* (*)(nzBufferType type, nzBufferAccess access, unsigned int offset, unsigned int size);
nzUInt8* LockBuffer(nzBufferType type, nzBufferAccess access, unsigned int offset, unsigned int size)
{
NazaraUnused(size);
if (access == nzBufferAccess_DiscardAndWrite)
{
GLint bufSize;
glGetBufferParameteriv(NzOpenGL::BufferTargetBinding[type], GL_BUFFER_SIZE, &bufSize);
GLint bufUsage;
glGetBufferParameteriv(NzOpenGL::BufferTargetBinding[type], GL_BUFFER_USAGE, &bufUsage);
// On discard le buffer
glBufferData(NzOpenGL::BufferTargetBinding[type], bufSize, nullptr, bufUsage);
}
void* ptr = glMapBuffer(NzOpenGL::BufferTarget[type], NzOpenGL::BufferLock[access]);
if (ptr)
return reinterpret_cast<nzUInt8*>(ptr) + offset;
else
return nullptr;
}
nzUInt8* LockBufferRange(nzBufferType type, nzBufferAccess access, unsigned int offset, unsigned int size)
{
return reinterpret_cast<nzUInt8*>(glMapBufferRange(NzOpenGL::BufferTarget[type], offset, size, NzOpenGL::BufferLockRange[access]));
}
nzUInt8* LockBufferFirstRun(nzBufferType type, nzBufferAccess access, unsigned int offset, unsigned int size);
LockRoutine mapBuffer = LockBufferFirstRun;
nzUInt8* LockBufferFirstRun(nzBufferType type, nzBufferAccess access, unsigned int offset, unsigned int size)
{
if (glMapBufferRange)
mapBuffer = LockBufferRange;
else
mapBuffer = LockBuffer;
return mapBuffer(type, access, offset, size);
}
}
NzHardwareBuffer::NzHardwareBuffer(NzBuffer* parent, nzBufferType type) :
m_type(type),
m_parent(parent)
@ -98,17 +51,19 @@ bool NzHardwareBuffer::Fill(const void* data, unsigned int offset, unsigned int
NzOpenGL::BindBuffer(m_type, m_buffer);
// http://www.opengl.org/wiki/Vertex_Specification_Best_Practices
if (forceDiscard)
glBufferData(NzOpenGL::BufferTarget[m_type], totalSize, nullptr, NzOpenGL::BufferUsage[m_parent->GetUsage()]); // Discard
// Il semblerait que glBuffer(Sub)Data soit plus performant que glMapBuffer(Range) en dessous d'un certain seuil
// http://www.stevestreeting.com/2007/03/17/glmapbuffer-vs-glbuffersubdata-the-return/
if (size < 32*1024)
{
// http://www.opengl.org/wiki/Buffer_Object_Streaming
if (forceDiscard)
glBufferData(NzOpenGL::BufferTarget[m_type], totalSize, nullptr, NzOpenGL::BufferUsage[m_parent->GetUsage()]); // Discard
glBufferSubData(NzOpenGL::BufferTarget[m_type], offset, size, data);
}
else
{
nzUInt8* ptr = mapBuffer(m_type, (forceDiscard) ? nzBufferAccess_DiscardAndWrite : nzBufferAccess_WriteOnly, offset, size);
void* ptr = Map((forceDiscard) ? nzBufferAccess_DiscardAndWrite : nzBufferAccess_WriteOnly, offset, size);
if (!ptr)
{
NazaraError("Failed to map buffer");
@ -117,15 +72,7 @@ bool NzHardwareBuffer::Fill(const void* data, unsigned int offset, unsigned int
std::memcpy(ptr, data, size);
if (glUnmapBuffer(NzOpenGL::BufferTarget[m_type]) != GL_TRUE)
{
// Une erreur rare est survenue, nous devons réinitialiser le buffer
NazaraError("Failed to unmap buffer, reinitialising content... (OpenGL error : 0x" + NzString::Number(glGetError(), 16) + ')');
glBufferData(NzOpenGL::BufferTarget[m_type], totalSize, nullptr, NzOpenGL::BufferUsage[m_parent->GetUsage()]);
return false;
}
Unmap();
}
return true;
@ -142,10 +89,20 @@ void* NzHardwareBuffer::Map(nzBufferAccess access, unsigned int offset, unsigned
NzOpenGL::BindBuffer(m_type, m_buffer);
if (access == nzBufferAccess_DiscardAndWrite)
glBufferData(NzOpenGL::BufferTarget[m_type], m_parent->GetSize(), nullptr, NzOpenGL::BufferUsage[m_parent->GetUsage()]); // Discard
if (glMapBufferRange)
return glMapBufferRange(NzOpenGL::BufferTarget[m_type], offset, size, NzOpenGL::BufferLockRange[access]);
else
{
// http://www.opengl.org/wiki/Buffer_Object_Streaming
if (access == nzBufferAccess_DiscardAndWrite)
glBufferData(NzOpenGL::BufferTarget[m_type], m_parent->GetSize(), nullptr, NzOpenGL::BufferUsage[m_parent->GetUsage()]); // Discard
return mapBuffer(m_type, access, offset, size);
nzUInt8* ptr = static_cast<nzUInt8*>(glMapBuffer(NzOpenGL::BufferTarget[m_type], NzOpenGL::BufferLock[access]));
if (ptr)
ptr += offset;
return ptr;
}
}
bool NzHardwareBuffer::Unmap()

18
src/Nazara/Renderer/OpenGL.cpp
View File

@ -1863,10 +1863,11 @@ static_assert(sizeof(NzOpenGL::BufferLock)/sizeof(GLenum) == nzBufferAccess_Max+
GLenum NzOpenGL::BufferLockRange[] =
{
GL_MAP_INVALIDATE_BUFFER_BIT | GL_MAP_WRITE_BIT, // nzBufferAccess_DiscardAndWrite
GL_MAP_READ_BIT, // nzBufferAccess_ReadOnly
GL_MAP_READ_BIT | GL_MAP_WRITE_BIT, // nzBufferAccess_ReadWrite
GL_MAP_WRITE_BIT // nzBufferAccess_WriteOnly
// http://www.opengl.org/discussion_boards/showthread.php/170118-VBOs-strangely-slow?p=1198118#post1198118
GL_MAP_INVALIDATE_BUFFER_BIT | GL_MAP_INVALIDATE_RANGE_BIT | GL_MAP_WRITE_BIT, // nzBufferAccess_DiscardAndWrite
GL_MAP_READ_BIT, // nzBufferAccess_ReadOnly
GL_MAP_READ_BIT | GL_MAP_WRITE_BIT, // nzBufferAccess_ReadWrite
GL_MAP_WRITE_BIT // nzBufferAccess_WriteOnly
};
static_assert(sizeof(NzOpenGL::BufferLockRange)/sizeof(GLenum) == nzBufferAccess_Max+1, "Buffer lock range array is incomplete");
@ -1889,11 +1890,10 @@ static_assert(sizeof(NzOpenGL::BufferTargetBinding)/sizeof(GLenum) == nzBufferTy
GLenum NzOpenGL::BufferUsage[] =
{
// J'ai choisi DYNAMIC à la place de STREAM car DYNAMIC semble plus adapté au profil "une mise à jour pour quelques rendus"
// Ce qui est je pense le scénario qui arrivera le plus souvent (Prévoir une option pour permettre d'utiliser le STREAM_DRAW ?)
// Source: http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=160839
GL_DYNAMIC_DRAW, // nzBufferUsage_Dynamic
GL_STATIC_DRAW // nzBufferUsage_Static
// D'après la documentation, GL_STREAM_DRAW semble être plus adapté à notre cas (ratio modification/rendu 1:2-3)
// Source: http://www.opengl.org/sdk/docs/man/html/glBufferData.xhtml
GL_STREAM_DRAW, // nzBufferUsage_Dynamic
GL_STATIC_DRAW // nzBufferUsage_Static
};
static_assert(sizeof(NzOpenGL::BufferUsage)/sizeof(GLenum) == nzBufferUsage_Max+1, "Buffer usage array is incomplete");