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#include "batch_merge_helper.hpp"
#include "drape/glextensions_list.hpp"
#include "drape/render_bucket.hpp"
#include "drape/vertex_array_buffer.hpp"
namespace df
{
void ReadBufferData(void * dst, glConst target, uint32_t size)
{
#ifdef OMIM_OS_DESKTOP
void * bufferPointer = GLFunctions::glMapBuffer(target, gl_const::GLReadOnly);
#else
void * bufferPointer = GLFunctions::glMapBufferRange(target, 0, size, gl_const::GLReadBufferBit);
#endif
memcpy(dst, bufferPointer, size);
}
struct NotSupported32BitIndex{};
struct Supported32BitIndex{};
template<typename TSupported>
void TransformIndeces(void * pointer, uint32_t count, uint32_t offset)
{
ASSERT(false, ());
}
template<>
void TransformIndeces<Supported32BitIndex>(void * pointer, uint32_t count, uint32_t offset)
{
uint32_t * indexPtr = reinterpret_cast<uint32_t *>(pointer);
for (uint32_t i = 0; i < count; ++i)
{
*indexPtr += offset;
++indexPtr;
}
}
template<>
void TransformIndeces<NotSupported32BitIndex>(void * pointer, uint32_t count, uint32_t offset)
{
uint16_t * indexPtr = reinterpret_cast<uint16_t *>(pointer);
uint16_t indexOffset = static_cast<uint16_t>(offset);
for (uint32_t i = 0; i < count; ++i)
{
*indexPtr += indexOffset;
++indexPtr;
}
}
bool BatchMergeHelper::IsMergeSupported()
{
#if defined(OMIM_OS_DESKTOP)
return true;
#else
static bool isSupported = dp::GLExtensionsList::Instance().IsSupported(dp::GLExtensionsList::MapBufferRange);
return isSupported;
#endif
}
void BatchMergeHelper::MergeBatches(vector<drape_ptr<RenderGroup>> & batches,
vector<drape_ptr<RenderGroup>> & mergedBatches,
bool isPerspective)
{
ASSERT(!batches.empty(), ());
if (batches.size() < 2)
{
mergedBatches.emplace_back(move(batches.front()));
return;
}
uint32_t const kIndexBufferSize = 30000;
uint32_t const kVertexBufferSize = 20000;
using TBuffer = dp::VertexArrayBuffer;
using TBucket = dp::RenderBucket;
auto flushFn = [&](drape_ptr<TBucket> && bucket, ref_ptr<TBuffer> buffer)
{
if (buffer->GetIndexCount() == 0)
return;
ref_ptr<RenderGroup> oldGroup = make_ref(batches.front());
drape_ptr<RenderGroup> newGroup = make_unique_dp<RenderGroup>(oldGroup->GetState(), oldGroup->GetTileKey());
newGroup->m_shader = oldGroup->m_shader;
newGroup->m_shader3d = oldGroup->m_shader3d;
newGroup->m_uniforms = oldGroup->m_uniforms;
newGroup->m_generalUniforms = oldGroup->m_generalUniforms;
newGroup->AddBucket(move(bucket));
buffer->Preflush();
if (isPerspective)
newGroup->m_shader3d->Bind();
else
newGroup->m_shader->Bind();
buffer->Build(isPerspective ? newGroup->m_shader3d : newGroup->m_shader);
mergedBatches.push_back(move(newGroup));
};
auto allocateFn = [=](drape_ptr<TBucket> & bucket, ref_ptr<TBuffer> & buffer)
{
bucket = make_unique_dp<TBucket>(make_unique_dp<TBuffer>(kIndexBufferSize, kVertexBufferSize));
buffer = bucket->GetBuffer();
};
auto copyVertecesFn = [](TBuffer::BuffersMap::value_type const & vboNode,
vector<uint8_t> & rawDataBuffer,
ref_ptr<TBuffer> newBuffer)
{
dp::BindingInfo const & binding = vboNode.first;
ref_ptr<dp::DataBufferBase> vbo = vboNode.second->GetBuffer();
uint32_t vertexCount = vbo->GetCurrentSize();
uint32_t bufferLength = vertexCount * vbo->GetElementSize();
if (rawDataBuffer.size() < bufferLength)
rawDataBuffer.resize(bufferLength);
vbo->Bind();
ReadBufferData(rawDataBuffer.data(), gl_const::GLArrayBuffer, bufferLength);
GLFunctions::glUnmapBuffer(gl_const::GLArrayBuffer);
newBuffer->UploadData(binding, rawDataBuffer.data(), vertexCount);
};
drape_ptr<TBucket> bucket;
ref_ptr<TBuffer> newBuffer;
allocateFn(bucket, newBuffer);
vector<uint8_t> rawDataBuffer;
for (drape_ptr<RenderGroup> const & group : batches)
{
for (drape_ptr<TBucket> const & b : group->m_renderBuckets)
{
ASSERT(b->m_overlay.empty(), ());
ref_ptr<TBuffer> buffer = b->GetBuffer();
uint32_t vertexCount = buffer->GetStartIndexValue();
uint32_t indexCount = buffer->GetIndexCount();
if (newBuffer->GetAvailableIndexCount() < vertexCount ||
newBuffer->GetAvailableVertexCount() < indexCount)
{
flushFn(move(bucket), newBuffer);
allocateFn(bucket, newBuffer);
}
bucket->SetFeatureMinZoom(b->GetMinZoom());
uint32_t indexOffset = newBuffer->GetStartIndexValue();
for (auto const & vboNode : buffer->m_staticBuffers)
{
copyVertecesFn(vboNode, rawDataBuffer, newBuffer);
}
for (auto const & vboNode : buffer->m_dynamicBuffers)
{
copyVertecesFn(vboNode, rawDataBuffer, newBuffer);
}
uint32_t indexByteCount = indexCount * dp::IndexStorage::SizeOfIndex();
if (rawDataBuffer.size() < indexByteCount)
rawDataBuffer.resize(indexByteCount);
buffer->m_indexBuffer->GetBuffer()->Bind();
ReadBufferData(rawDataBuffer.data(), gl_const::GLElementArrayBuffer, indexByteCount);
GLFunctions::glUnmapBuffer(gl_const::GLElementArrayBuffer);
if (dp::IndexStorage::IsSupported32bit())
TransformIndeces<Supported32BitIndex>(rawDataBuffer.data(), indexCount, indexOffset);
else
TransformIndeces<NotSupported32BitIndex>(rawDataBuffer.data(), indexCount, indexOffset);
newBuffer->UploadIndexes(rawDataBuffer.data(), indexCount);
}
}
if (newBuffer->GetIndexCount() > 0)
{
flushFn(move(bucket), newBuffer);
allocateFn(bucket, newBuffer);
}
}
}
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