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正确使用stride

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jinchao
2025-10-09 21:40:05 +08:00
parent f47fde76c0
commit 698c1a1099
1 changed files with 12 additions and 7 deletions
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source/core/source/device/dvc_buffer_accessor.cpp
+12 -7
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@@ -25,10 +25,11 @@ void DeviceBufferAccessor::walk(std::function<bool(const uint8_t*, size_t)> call
DeviceBufferConstPtr buffer = m_bufferView->getBuffer();
const uint8_t* ptr = buffer->ptr(m_bufferView->getOffset()) + m_offset;
const size_t step = m_bufferView->getStride() > 0 ? m_bufferView->getStride() : m_elementSize;
size_t startIndex = start;
size_t endIndex = (end == ((size_t)-1)) ? m_count : end;
for (size_t index = startIndex; index < endIndex; index++, ptr+=m_elementSize)
for (size_t index = startIndex; index < endIndex; index++, ptr+=step)
{
if (callback(ptr, index))
{
@@ -44,12 +45,13 @@ void DeviceBufferAccessor::walk2(std::function<bool(const uint8_t*, const uint8_
DeviceBufferConstPtr buffer = m_bufferView->getBuffer();
const uint8_t* ptr = buffer->ptr(m_bufferView->getOffset()) + m_offset;
const size_t step = m_bufferView->getStride() > 0 ? m_bufferView->getStride() : m_elementSize;
size_t startIndex = start;
size_t endIndex = (end == ((size_t)-1)) ? m_count : end;
for (size_t index = startIndex; index < endIndex; index+=2, ptr+=m_elementSize*2)
for (size_t index = startIndex; index < endIndex; index+=2, ptr+=step*2)
{
if (callback(ptr, ((index + 1) < endIndex) ? (ptr + m_elementSize) : nullptr, index))
if (callback(ptr, ((index + 1) < endIndex) ? (ptr + step) : nullptr, index))
{
break;
}
@@ -63,14 +65,15 @@ void DeviceBufferAccessor::walk3(std::function<bool(const uint8_t*, const uint8_
DeviceBufferConstPtr buffer = m_bufferView->getBuffer();
const uint8_t* ptr = buffer->ptr(m_bufferView->getOffset()) + m_offset;
const size_t step = m_bufferView->getStride() > 0 ? m_bufferView->getStride() : m_elementSize;
size_t startIndex = start;
size_t endIndex = (end == ((size_t)-1)) ? m_count : end;
for (size_t index = startIndex; index < endIndex; index += 3, ptr += m_elementSize * 3)
for (size_t index = startIndex; index < endIndex; index += 3, ptr += step * 3)
{
if(callback(ptr,
((index + 1) < endIndex) ? (ptr + m_elementSize) : nullptr,
((index + 2) < endIndex) ? (ptr + m_elementSize*2) : nullptr,
((index + 1) < endIndex) ? (ptr + step) : nullptr,
((index + 2) < endIndex) ? (ptr + step*2) : nullptr,
index))
{
break;
@@ -85,7 +88,9 @@ const uint8_t* DeviceBufferAccessor::getElement(size_t index) const
}
DeviceBufferConstPtr buffer = m_bufferView->getBuffer();
const uint8_t* pData = buffer->ptr(m_bufferView->getOffset()) + m_offset + index * m_elementSize;
const uint8_t* pData = buffer->ptr(m_bufferView->getOffset())
+ m_offset
+ index * (m_bufferView->getStride()>0 ? m_bufferView->getStride(): m_elementSize);
return pData;
}