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#include "drape/gpu_buffer.hpp"
#include "drape/glextensions_list.hpp"
#include "drape/glfunctions.hpp"
#include "drape/utils/gpu_mem_tracker.hpp"
#include "base/assert.hpp"
#include <cstring>
//#define CHECK_VBO_BOUNDS
namespace dp
{
namespace
{
bool IsMapBufferSupported()
{
static bool const isSupported =
GLExtensionsList::Instance().IsSupported(GLExtensionsList::MapBuffer);
return isSupported;
}
glConst glTarget(GPUBuffer::Target t)
{
if (t == GPUBuffer::ElementBuffer)
return gl_const::GLArrayBuffer;
return gl_const::GLElementArrayBuffer;
}
} // namespace
GPUBuffer::GPUBuffer(Target t, void const * data, uint8_t elementSize, uint32_t capacity)
: TBase(elementSize, capacity)
, m_t(t)
, m_mappingOffset(0)
#ifdef DEBUG
, m_isMapped(false)
#endif
{
m_bufferID = GLFunctions::glGenBuffer();
Resize(data, capacity);
}
GPUBuffer::~GPUBuffer()
{
GLFunctions::glBindBuffer(0, glTarget(m_t));
GLFunctions::glDeleteBuffer(m_bufferID);
#if defined(TRACK_GPU_MEM)
dp::GPUMemTracker::Inst().RemoveDeallocated("VBO", m_bufferID);
#endif
}
void GPUBuffer::UploadData(void const * data, uint32_t elementCount)
{
ASSERT(!m_isMapped, ());
uint32_t currentSize = GetCurrentSize();
uint8_t elementSize = GetElementSize();
ASSERT(GetCapacity() >= elementCount + currentSize,
("Not enough memory to upload ", elementCount, " elements"));
Bind();
#if defined(CHECK_VBO_BOUNDS)
int32_t size = GLFunctions::glGetBufferParameter(glTarget(m_t), gl_const::GLBufferSize);
ASSERT_EQUAL(GetCapacity() * elementSize, size, ());
ASSERT_LESS_OR_EQUAL((elementCount + currentSize) * elementSize, size, ());
#endif
GLFunctions::glBufferSubData(glTarget(m_t), elementCount * elementSize, data,
currentSize * elementSize);
TBase::UploadData(elementCount);
#if defined(TRACK_GPU_MEM)
dp::GPUMemTracker::Inst().SetUsed("VBO", m_bufferID, (currentSize + elementCount) * elementSize);
#endif
}
void GPUBuffer::Bind() { GLFunctions::glBindBuffer(m_bufferID, glTarget(m_t)); }
void * GPUBuffer::Map(uint32_t elementOffset, uint32_t elementCount)
{
#ifdef DEBUG
ASSERT(!m_isMapped, ());
m_isMapped = true;
#endif
if (GLFunctions::CurrentApiVersion == dp::ApiVersion::OpenGLES2)
{
m_mappingOffset = elementOffset;
return IsMapBufferSupported() ? GLFunctions::glMapBuffer(glTarget(m_t)) : nullptr;
}
else if (GLFunctions::CurrentApiVersion == dp::ApiVersion::OpenGLES3)
{
ASSERT(IsMapBufferSupported(), ());
m_mappingOffset = 0;
uint32_t const elementSize = GetElementSize();
uint32_t const byteOffset = elementOffset * elementSize;
uint32_t const byteCount = elementCount * elementSize;
return GLFunctions::glMapBufferRange(glTarget(m_t), byteOffset, byteCount,
gl_const::GLWriteBufferBit);
}
return nullptr;
}
void GPUBuffer::UpdateData(void * gpuPtr, void const * data, uint32_t elementOffset,
uint32_t elementCount)
{
uint32_t const elementSize = GetElementSize();
uint32_t const byteOffset = (elementOffset + m_mappingOffset) * elementSize;
uint32_t const byteCount = elementCount * elementSize;
uint32_t const byteCapacity = GetCapacity() * elementSize;
ASSERT(m_isMapped, ());
#if defined(CHECK_VBO_BOUNDS)
int32_t size = GLFunctions::glGetBufferParameter(glTarget(m_t), gl_const::GLBufferSize);
ASSERT_EQUAL(size, byteCapacity, ());
ASSERT_LESS_OR_EQUAL(byteOffset + byteCount, size, ());
#endif
if (IsMapBufferSupported())
{
ASSERT(gpuPtr != nullptr, ());
memcpy((uint8_t *)gpuPtr + byteOffset, data, byteCount);
}
else
{
ASSERT(gpuPtr == nullptr, ());
if (byteOffset == 0 && byteCount == byteCapacity)
GLFunctions::glBufferData(glTarget(m_t), byteCount, data, gl_const::GLStaticDraw);
else
GLFunctions::glBufferSubData(glTarget(m_t), byteCount, data, byteOffset);
}
}
void GPUBuffer::Unmap()
{
#ifdef DEBUG
ASSERT(m_isMapped, ());
m_isMapped = false;
#endif
m_mappingOffset = 0;
if (IsMapBufferSupported())
GLFunctions::glUnmapBuffer(glTarget(m_t));
}
void GPUBuffer::Resize(void const * data, uint32_t elementCount)
{
TBase::Resize(elementCount);
Bind();
GLFunctions::glBufferData(glTarget(m_t), GetCapacity() * GetElementSize(), data,
gl_const::GLDynamicDraw);
// If we have set up data already (in glBufferData), we have to call SetDataSize.
if (data != nullptr)
SetDataSize(elementCount);
#if defined(TRACK_GPU_MEM)
dp::GPUMemTracker & memTracker = dp::GPUMemTracker::Inst();
memTracker.RemoveDeallocated("VBO", m_bufferID);
memTracker.AddAllocated("VBO", m_bufferID, GetCapacity() * GetElementSize());
if (data != nullptr)
dp::GPUMemTracker::Inst().SetUsed("VBO", m_bufferID, GetCurrentSize() * GetElementSize());
#endif
}
} // namespace dp
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