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#include "RenderBuffersManager.h"
#include "RenderStatistics.h"
#include "GL/GLDebug.h"
#include "../ServiceLocator.h"
#include "IGfxCapabilities.h"
#include "../../Main.h"
#include "../tracy.h"
using namespace Death;
using namespace Death::Containers::Literals;
namespace nCine
{
RenderBuffersManager::RenderBuffersManager(bool useBufferMapping, std::uint32_t vboMaxSize, std::uint32_t iboMaxSize)
{
buffers_.reserve(4);
BufferSpecifications& vboSpecs = specs_[std::int32_t(BufferTypes::Array)];
vboSpecs.type = BufferTypes::Array;
vboSpecs.target = GL_ARRAY_BUFFER;
vboSpecs.mapFlags = useBufferMapping ? GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_BUFFER_BIT | GL_MAP_FLUSH_EXPLICIT_BIT : 0;
vboSpecs.usageFlags = GL_STREAM_DRAW;
vboSpecs.maxSize = vboMaxSize;
vboSpecs.alignment = sizeof(GLfloat);
BufferSpecifications& iboSpecs = specs_[std::int32_t(BufferTypes::ElementArray)];
iboSpecs.type = BufferTypes::ElementArray;
iboSpecs.target = GL_ELEMENT_ARRAY_BUFFER;
iboSpecs.mapFlags = useBufferMapping ? GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_BUFFER_BIT | GL_MAP_FLUSH_EXPLICIT_BIT : 0;
iboSpecs.usageFlags = GL_STREAM_DRAW;
iboSpecs.maxSize = iboMaxSize;
iboSpecs.alignment = sizeof(GLushort);
const IGfxCapabilities& gfxCaps = theServiceLocator().GetGfxCapabilities();
const std::int32_t offsetAlignment = gfxCaps.GetValue(IGfxCapabilities::GLIntValues::UNIFORM_BUFFER_OFFSET_ALIGNMENT);
const std::int32_t uboMaxSize = gfxCaps.GetValue(IGfxCapabilities::GLIntValues::MAX_UNIFORM_BLOCK_SIZE_NORMALIZED);
BufferSpecifications& uboSpecs = specs_[std::int32_t(BufferTypes::Uniform)];
uboSpecs.type = BufferTypes::Uniform;
uboSpecs.target = GL_UNIFORM_BUFFER;
uboSpecs.mapFlags = useBufferMapping ? GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_BUFFER_BIT | GL_MAP_FLUSH_EXPLICIT_BIT : 0;
uboSpecs.usageFlags = GL_STREAM_DRAW;
uboSpecs.maxSize = std::uint32_t(uboMaxSize);
uboSpecs.alignment = std::uint32_t(offsetAlignment);
// Create the first buffer for each type right away
for (std::uint32_t i = 0; i < std::uint32_t(BufferTypes::Count); i++) {
CreateBuffer(specs_[i]);
}
}
namespace
{
const char* bufferTypeToString(RenderBuffersManager::BufferTypes type)
{
switch (type) {
case RenderBuffersManager::BufferTypes::Array: return "Array";
case RenderBuffersManager::BufferTypes::ElementArray: return "Element Array";
case RenderBuffersManager::BufferTypes::Uniform: return "Uniform";
default: return "";
}
}
}
RenderBuffersManager::Parameters RenderBuffersManager::AcquireMemory(BufferTypes type, std::uint32_t bytes, std::uint32_t alignment)
{
FATAL_ASSERT_MSG(bytes <= specs_[std::int32_t(type)].maxSize, "Trying to acquire {} bytes when the maximum for buffer type \"{}\" is {}",
bytes, bufferTypeToString(type), specs_[std::int32_t(type)].maxSize);
// Accepting a custom alignment only if it is a multiple of the specification one
if (alignment % specs_[std::int32_t(type)].alignment != 0) {
alignment = specs_[std::int32_t(type)].alignment;
}
Parameters params;
for (ManagedBuffer& buffer : buffers_) {
if (buffer.type == type) {
const std::uint32_t offset = buffer.size - buffer.freeSpace;
const std::uint32_t alignAmount = (alignment - offset % alignment) % alignment;
if (buffer.freeSpace >= bytes + alignAmount) {
params.object = buffer.object.get();
params.offset = offset + alignAmount;
params.size = bytes;
buffer.freeSpace -= bytes + alignAmount;
params.mapBase = buffer.mapBase;
break;
}
}
}
if (params.object == nullptr) {
CreateBuffer(specs_[std::int32_t(type)]);
params.object = buffers_.back().object.get();
params.offset = 0;
params.size = bytes;
buffers_.back().freeSpace -= bytes;
params.mapBase = buffers_.back().mapBase;
}
return params;
}
void RenderBuffersManager::FlushUnmap()
{
ZoneScopedC(0x81A861);
GLDebug::ScopedGroup scoped("RenderBuffersManager::flushUnmap()"_s);
for (ManagedBuffer& buffer : buffers_) {
#if defined(NCINE_PROFILING)
RenderStatistics::GatherStatistics(buffer);
#endif
const std::uint32_t usedSize = buffer.size - buffer.freeSpace;
FATAL_ASSERT(usedSize <= specs_[std::int32_t(buffer.type)].maxSize);
buffer.freeSpace = buffer.size;
if (specs_[std::int32_t(buffer.type)].mapFlags == 0) {
if (usedSize > 0) {
buffer.object->BufferSubData(0, usedSize, buffer.hostBuffer.get());
}
} else {
if (usedSize > 0) {
buffer.object->FlushMappedBufferRange(0, usedSize);
}
buffer.object->Unmap();
}
buffer.mapBase = nullptr;
}
}
void RenderBuffersManager::Remap()
{
ZoneScopedC(0x81A861);
GLDebug::ScopedGroup scoped("RenderBuffersManager::remap()"_s);
for (ManagedBuffer& buffer : buffers_) {
DEATH_ASSERT(buffer.freeSpace == buffer.size);
DEATH_ASSERT(buffer.mapBase == nullptr);
if (specs_[std::int32_t(buffer.type)].mapFlags == 0) {
buffer.object->BufferData(buffer.size, nullptr, specs_[std::int32_t(buffer.type)].usageFlags);
buffer.mapBase = buffer.hostBuffer.get();
} else {
buffer.mapBase = static_cast<GLubyte*>(buffer.object->MapBufferRange(0, buffer.size, specs_[std::int32_t(buffer.type)].mapFlags));
}
FATAL_ASSERT(buffer.mapBase != nullptr);
}
}
void RenderBuffersManager::CreateBuffer(const BufferSpecifications& specs)
{
ZoneScopedC(0x81A861);
ManagedBuffer& managedBuffer = buffers_.emplace_back();
managedBuffer.type = specs.type;
managedBuffer.size = specs.maxSize;
managedBuffer.object = std::make_unique<GLBufferObject>(specs.target);
managedBuffer.object->BufferData(managedBuffer.size, nullptr, specs.usageFlags);
managedBuffer.freeSpace = managedBuffer.size;
switch (managedBuffer.type) {
default:
case BufferTypes::Array:
managedBuffer.object->SetObjectLabel("Vertex_ManagedBuffer"_s);
break;
case BufferTypes::ElementArray:
managedBuffer.object->SetObjectLabel("Index_ManagedBuffer"_s);
break;
case BufferTypes::Uniform:
managedBuffer.object->SetObjectLabel("Uniform_ManagedBuffer"_s);
break;
}
if (specs.mapFlags == 0) {
managedBuffer.hostBuffer = std::make_unique<GLubyte[]>(specs.maxSize);
managedBuffer.mapBase = managedBuffer.hostBuffer.get();
} else {
managedBuffer.mapBase = static_cast<GLubyte*>(managedBuffer.object->MapBufferRange(0, managedBuffer.size, specs.mapFlags));
}
FATAL_ASSERT(managedBuffer.mapBase != nullptr);
#if defined(DEATH_DEBUG)
if (GLDebug::IsAvailable()) {
char debugString[128];
std::size_t length = formatInto(debugString, "Create {} buffer 0x{:x}", bufferTypeToString(specs.type), std::uintptr_t(buffers_.back().object.get()));
GLDebug::MessageInsert({ debugString, length });
}
#endif
}
}
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