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#include "drape/gpu_buffer.hpp"
#include "drape/glfunctions.hpp"
#include "drape/glextensions_list.hpp"
#include "base/assert.hpp"
#include "std/cstring.hpp"
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;
}
GPUBuffer::GPUBuffer(Target t, uint8_t elementSize, uint16_t capacity)
: base_t(elementSize, capacity)
, m_t(t)
#ifdef DEBUG
, m_isMapped(false)
#endif
{
m_bufferID = GLFunctions::glGenBuffer();
Resize(capacity);
}
GPUBuffer::~GPUBuffer()
{
GLFunctions::glBindBuffer(0, glTarget(m_t));
GLFunctions::glDeleteBuffer(m_bufferID);
}
void GPUBuffer::UploadData(void const * data, uint16_t elementCount)
{
ASSERT(m_isMapped == false, ());
uint16_t currentSize = GetCurrentSize();
uint8_t elementSize = GetElementSize();
ASSERT(GetCapacity() >= elementCount + currentSize, ("Not enough memory to upload ", elementCount, " elements"));
Bind();
GLFunctions::glBufferSubData(glTarget(m_t), elementCount * elementSize, data, currentSize * elementSize);
base_t::UploadData(elementCount);
}
void GPUBuffer::Bind()
{
GLFunctions::glBindBuffer(m_bufferID, glTarget(m_t));
}
void * GPUBuffer::Map()
{
#ifdef DEBUG
ASSERT(m_isMapped == false, ());
m_isMapped = true;
#endif
if (IsMapBufferSupported())
return GLFunctions::glMapBuffer(glTarget(m_t));
return NULL;
}
void GPUBuffer::UpdateData(void * gpuPtr, void const * data, uint16_t elementOffset, uint16_t elementCount)
{
uint16_t const elementSize = GetElementSize();
uint32_t const byteOffset = elementOffset * (uint32_t)elementSize;
uint32_t const byteCount = elementCount * (uint32_t)elementSize;
ASSERT(m_isMapped == true, ());
if (IsMapBufferSupported())
{
ASSERT(gpuPtr != NULL, ());
memcpy((uint8_t *)gpuPtr + byteOffset, data, byteCount);
}
else
{
ASSERT(gpuPtr == NULL, ());
if (byteOffset == 0 && byteCount == GetCapacity())
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 == true, ());
m_isMapped = false;
#endif
if (IsMapBufferSupported())
GLFunctions::glUnmapBuffer(glTarget(m_t));
}
void GPUBuffer::Resize(uint16_t elementCount)
{
base_t::Resize(elementCount);
Bind();
GLFunctions::glBufferData(glTarget(m_t), GetCapacity() * GetElementSize(), NULL, gl_const::GLStaticDraw);
}
////////////////////////////////////////////////////////////////////////////
GPUBufferMapper::GPUBufferMapper(RefPointer<GPUBuffer> buffer)
: m_buffer(buffer)
{
#ifdef DEBUG
if (m_buffer->m_t == GPUBuffer::ElementBuffer)
{
ASSERT(m_mappedDataBuffer == 0, ());
m_mappedDataBuffer = m_buffer->m_bufferID;
}
else
{
ASSERT(m_mappedIndexBuffer == 0, ());
m_mappedIndexBuffer = m_buffer->m_bufferID;
}
#endif
m_buffer->Bind();
m_gpuPtr = m_buffer->Map();
}
GPUBufferMapper::~GPUBufferMapper()
{
#ifdef DEBUG
if (m_buffer->m_t == GPUBuffer::ElementBuffer)
{
ASSERT(m_mappedDataBuffer == m_buffer->m_bufferID, ());
m_mappedDataBuffer = 0;
}
else
{
ASSERT(m_mappedIndexBuffer == m_buffer->m_bufferID, ());
m_mappedIndexBuffer = 0;
}
#endif
m_buffer->Unmap();
}
void GPUBufferMapper::UpdateData(void const * data, uint16_t elementOffset, uint16_t elementCount)
{
m_buffer->UpdateData(m_gpuPtr, data, elementOffset, elementCount);
}
#ifdef DEBUG
uint32_t GPUBufferMapper::m_mappedDataBuffer;
uint32_t GPUBufferMapper::m_mappedIndexBuffer;
#endif
} // namespace dp
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