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MobileGL/MG/MG_GL/Implementations/GL/Buffer/GL_Buffer.cpp
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//
// Created by BZLZHH on 2025/3/15.
//
#include "GL_Buffer.h"
namespace MG_GL::GL {
Diligent::VALUE_TYPE ConvertGLIndexTypeToDiligent(GLenum type) {
switch (type) {
case GL_UNSIGNED_BYTE: return Diligent::VT_UINT8;
case GL_UNSIGNED_SHORT: return Diligent::VT_UINT16;
case GL_UNSIGNED_INT: return Diligent::VT_UINT32;
default: return Diligent::VT_UNDEFINED;
}
}
void* MapBufferRange(GLenum target, GLintptr offset, GLsizeiptr length,
GLbitfield access) {
MG_Util::Debug::LogD("glMapBufferRange, target: %s, offset: %lld, length: %lld, access: 0x%X",
MG_Util::Debug::GLEnumToString(target),
static_cast<long long>(offset),
static_cast<long long>(length),
access);
void* mappedPointer = nullptr;
GLenum result = MG_State::AcquireBufferMemoryRange(target, offset, length, access, &mappedPointer);
if (result == GL_NO_ERROR) {
MG_Util::Debug::LogD("Mapped pointer: %p", mappedPointer);
return mappedPointer;
}
MG_State::SetError(result);
MG_Util::Debug::LogE("Error mapping buffer range: %s", MG_Util::Debug::GLEnumToString(result));
return nullptr;
}
void FlushMappedBufferRange(GLenum target, GLintptr offset, GLsizeiptr length) {
MG_Util::Debug::LogD("glFlushMappedBufferRange, target: %s, offset: %lld, length: %lld",
MG_Util::Debug::GLEnumToString(target),
static_cast<long long>(offset),
static_cast<long long>(length));
GLenum result = MG_State::SyncBufferMemory(target, offset, length);
if (result == GL_NO_ERROR) {
GLuint buffer = MG_State_T::bufferState->GetCurrentBinding(target);
if (buffer == 0) return;
auto& bufferObj = MG_State_T::bufferState->buffers_[buffer];
if (!bufferObj.isMapped) return;
size_t start = static_cast<size_t>(offset);
size_t end = start + static_cast<size_t>(length);
Diligent::IBuffer* pBuffer = MG_Diligent::g_BufferMap[buffer];
if (pBuffer && bufferObj.data.size() >= end) {
const auto& Desc = pBuffer->GetDesc();
if (Desc.Usage == Diligent::USAGE_STAGING || Desc.Usage == Diligent::USAGE_DYNAMIC || Desc.Usage == Diligent::USAGE_UNIFIED) {
void * data;
MG_Diligent::g_pContext->MapBuffer(pBuffer, Diligent::MAP_WRITE,
Diligent::MAP_FLAG_DISCARD, data);
if (data) {
void* dst = static_cast<char*>(data) + offset;
const void* src = bufferObj.data.data() + offset;
memcpy(dst, src, length);
MG_Diligent::g_pContext->UnmapBuffer(pBuffer, Diligent::MAP_WRITE);
}
} else {
// For USAGE_DEFAULT or USAGE_IMMUTABLE, use UpdateBuffer
MG_Diligent::g_pContext->UpdateBuffer(pBuffer, static_cast<Diligent::Uint64>(offset), static_cast<Diligent::Uint64>(length), bufferObj.data.data() + offset, Diligent::RESOURCE_STATE_TRANSITION_MODE_TRANSITION);
}
}
return;
}
MG_State::SetError(result);
MG_Util::Debug::LogE("Error flushing mapped buffer range: %s",
MG_Util::Debug::GLEnumToString(result));
}
void CopyBufferSubData(GLenum readTarget, GLenum writeTarget,
GLintptr readOffset, GLintptr writeOffset,
GLsizeiptr size) {
MG_Util::Debug::LogD("glCopyBufferSubData, readTarget: %s, writeTarget: %s, "
"readOffset: %lld, writeOffset: %lld, size: %lld",
MG_Util::Debug::GLEnumToString(readTarget),
MG_Util::Debug::GLEnumToString(writeTarget),
static_cast<long long>(readOffset),
static_cast<long long>(writeOffset),
static_cast<long long>(size));
GLenum result = MG_State::CopyBufferRange(readTarget, writeTarget, readOffset, writeOffset, size);
if (result == GL_NO_ERROR) {
GLuint srcBuffer = MG_State_T::bufferState->GetCurrentBinding(readTarget);
GLuint dstBuffer = MG_State_T::bufferState->GetCurrentBinding(writeTarget);
if (srcBuffer == 0 || dstBuffer == 0) return;
Diligent::IBuffer* pSrcBuffer = MG_Diligent::g_BufferMap[srcBuffer];
Diligent::IBuffer* pDstBuffer = MG_Diligent::g_BufferMap[dstBuffer];
if (pSrcBuffer && pDstBuffer) {
MG_Diligent::g_pContext->CopyBuffer(pSrcBuffer, static_cast<Diligent::Uint64>(readOffset),
Diligent::RESOURCE_STATE_TRANSITION_MODE_TRANSITION,
pDstBuffer, static_cast<Diligent::Uint64>(writeOffset),
static_cast<Diligent::Uint64>(size),
Diligent::RESOURCE_STATE_TRANSITION_MODE_TRANSITION);
}
return;
}
MG_State::SetError(result);
MG_Util::Debug::LogE("Error copying buffer subdata: %s",
MG_Util::Debug::GLEnumToString(result));
}
void* MapBuffer(GLenum target, GLenum access) {
MG_Util::Debug::LogD("glMapBuffer(target=0x%x, access=0x%x)", target, access);
void* mappedPtr = nullptr;
GLenum err = MG_State::AcquireBufferMemory(target, access, &mappedPtr);
if (err != GL_NO_ERROR) {
MG_State::SetError(err);
MG_Util::Debug::LogE("glMapBuffer failed: %s", MG_Util::Debug::GLEnumToString(err));
return nullptr;
}
MG_Util::Debug::LogD("glMapBuffer returns %p", mappedPtr);
return mappedPtr;
}
GLboolean UnmapBuffer(GLenum target) {
MG_Util::Debug::LogD("glUnmapBuffer(target=0x%x)", target);
GLenum err = MG_State::ReleaseBufferMemory(target);
if (err != GL_NO_ERROR) {
MG_State::SetError(err);
MG_Util::Debug::LogE("glUnmapBuffer failed: %s", MG_Util::Debug::GLEnumToString(err));
return GL_FALSE;
}
GLuint buffer = MG_State_T::bufferState->currentBindings_[target];
auto& bufferObj = MG_State_T::bufferState->buffers_[buffer];
Diligent::IBuffer* pBuffer = MG_Diligent::g_BufferMap[buffer];
if (pBuffer) {
const auto& Desc = pBuffer->GetDesc();
if (Desc.Usage == Diligent::USAGE_STAGING || Desc.Usage == Diligent::USAGE_DYNAMIC || Desc.Usage == Diligent::USAGE_UNIFIED) {
void * data;
MG_Diligent::g_pContext->MapBuffer(pBuffer, Diligent::MAP_WRITE,
Diligent::MAP_FLAG_DISCARD, data);
if (data) {
memcpy(data, bufferObj.data.data(), bufferObj.data.size());
MG_Diligent::g_pContext->UnmapBuffer(pBuffer, Diligent::MAP_WRITE);
}
} else {
// For USAGE_DEFAULT or USAGE_IMMUTABLE, use UpdateBuffer
MG_Diligent::g_pContext->UpdateBuffer(pBuffer, 0, bufferObj.data.size(), bufferObj.data.data(), Diligent::RESOURCE_STATE_TRANSITION_MODE_TRANSITION);
}
}
MG_Util::Debug::LogD("glUnmapBuffer succeeded");
return GL_TRUE;
}
void BindBuffer(GLenum target, GLuint buffer) {
MG_Util::Debug::LogD("glBindBuffer, target: %s, buffer: %d", MG_Util::Debug::GLEnumToString(target), buffer);
if (buffer != 0 &&
MG_State::ValidateGeneratedName(buffer) &&
!MG_State::ValidateAllocatedBufferHandle(buffer)) {
MG_Util::Debug::LogD("Actually creating buffer: %u", buffer);
GLenum result = MG_State::CreateBuffer(buffer);
if (result != GL_NO_ERROR) {
MG_State::SetError(result);
MG_Util::Debug::LogE("Error from MG State: %s", MG_Util::Debug::GLEnumToString(result));
return;
}
}
if (buffer != 0 && !MG_State::ValidateAllocatedBufferHandle(buffer)) {
MG_State::SetError(GL_INVALID_VALUE);
MG_Util::Debug::LogE("Invalid buffer handle: %u", buffer);
return;
}
GLenum result = MG_State::BindBuffer(target, buffer);
if (result == GL_NO_ERROR)
return;
MG_State::SetError(result);
MG_Util::Debug::LogE("Error from MG State: %s", MG_Util::Debug::GLEnumToString(result));
}
void BufferData(GLenum target, GLsizeiptr size, const void* data, GLenum usage) {
MG_Util::Debug::LogD("glBufferData, target: %s, size: %zd, data: %p, usage: %s",
MG_Util::Debug::GLEnumToString(target), size, data, MG_Util::Debug::GLEnumToString(usage));
GLenum result = MG_State::CommitBufferStorage(target, size, data, usage);
if (result == GL_NO_ERROR) {
GLuint buffer = MG_State_T::bufferState->GetCurrentBinding(target);
if (buffer == 0) return;
auto& bufferObj = MG_State_T::bufferState->buffers_[buffer];
if (bufferObj.isDynamic) return; // Dynamic buffer should be created by glDraw*
bufferObj.dirty = false;
Diligent::IBuffer*& pBuffer = MG_Diligent::g_BufferMap[buffer];
Diligent::BufferDesc BuffDesc;
std::string name;
BuffDesc.Size = static_cast<Diligent::Uint64>(size);
switch (target) {
case GL_ARRAY_BUFFER:
BuffDesc.BindFlags = Diligent::BIND_VERTEX_BUFFER;
name += std::format("VBO {}", buffer);
break;
case GL_ELEMENT_ARRAY_BUFFER:
BuffDesc.BindFlags = Diligent::BIND_INDEX_BUFFER;
name += std::format("IBO {}", buffer);
break;
case GL_UNIFORM_BUFFER:
BuffDesc.BindFlags = Diligent::BIND_UNIFORM_BUFFER;
name += std::format("UBO {}", buffer);
break;
default:
BuffDesc.BindFlags = Diligent::BIND_SHADER_RESOURCE;
name += std::format("SRV {}", buffer);
break;
}
BuffDesc.Name = name.c_str();
BuffDesc.Usage = Diligent::USAGE_DEFAULT;
if (!pBuffer || (pBuffer && pBuffer->GetDesc().Size != bufferObj.data.size())) {
if (pBuffer) {
pBuffer->Release();
pBuffer = nullptr;
}
Diligent::BufferData BuffData;
// Initial data must not be null for immutable buffers
BuffData.pData = BuffDesc.Usage != Diligent::USAGE_IMMUTABLE ? nullptr : bufferObj.data.data();
BuffData.DataSize = static_cast<Diligent::Uint64>(size);
MG_Diligent::g_pDevice->CreateBuffer(BuffDesc, &BuffData, &pBuffer);
}
if (data != nullptr && BuffDesc.Usage != Diligent::USAGE_IMMUTABLE) {
MG_Diligent::g_pContext->UpdateBuffer(pBuffer, 0,
static_cast<Diligent::Uint64>(size), data,
Diligent::RESOURCE_STATE_TRANSITION_MODE_TRANSITION);
}
return;
}
MG_State::SetError(result);
MG_Util::Debug::LogE("Error from MG State: %s", MG_Util::Debug::GLEnumToString(result));
}
void GetBufferParameteriv(GLenum target, GLenum pname, GLint* params) {
MG_Util::Debug::LogD("glGetBufferParameteriv, target: %d, pname: %d, params: %p",
target, pname, params);
GLenum result = MG_State::QueryBufferPropertyIntVector(target, pname, params);
if (result == GL_NO_ERROR)
return;
MG_State::SetError(result);
MG_Util::Debug::LogE("GetBufferParameteriv not implemented");
}
void GenBuffers(GLsizei n, GLuint* buffers) {
MG_Util::Debug::LogD("glGenBuffers, n: %d, buffers: %p", n, buffers);
if (n < 0) {
MG_State::SetError(GL_INVALID_VALUE);
MG_Util::Debug::LogE("Invalid buffer count: %d", n);
return;
}
GLenum result = MG_State::GenBufferNames(n, buffers);
if (result == GL_NO_ERROR) {
MG_Util::Debug::LogD("Generated buffer names:");
for (GLsizei i = 0; i < n; ++i) {
MG_Util::Debug::LogD(" Buffer[%d] = %u", i, buffers[i]);
MG_Diligent::g_BufferMap[buffers[i]] = nullptr;
}
return;
}
MG_State::SetError(result);
MG_Util::Debug::LogE("Error from MG State: %s", MG_Util::Debug::GLEnumToString(result));
}
GLboolean IsBuffer(GLuint buffer) {
MG_Util::Debug::LogD("glIsBuffer, buffer: %u", buffer);
if (buffer == 0) {
return GL_FALSE;
}
bool isValid = MG_State::ValidateAllocatedBufferHandle(buffer);
// Should we report gl error here or in MG_State?
MG_Util::Debug::LogD("Buffer %u is %s", buffer, isValid ? "valid" : "invalid");
return isValid ? GL_TRUE : GL_FALSE;
}
void BufferSubData(GLenum target, GLintptr offset, GLsizeiptr size, const void* data) {
MG_Util::Debug::LogD("glBufferSubData, target: %s, offset: %lld, size: %lld, data: %p",
MG_Util::Debug::GLEnumToString(target),
static_cast<long long>(offset),
static_cast<long long>(size),
data);
GLenum result = MG_State::CommitBufferStorageRegion(target, offset, size, data);
if (result != GL_NO_ERROR) {
MG_State::SetError(result);
MG_Util::Debug::LogE("Error from MG State: %s", MG_Util::Debug::GLEnumToString(result));
}
GLuint buffer = MG_State_T::bufferState->GetCurrentBinding(target);
if (buffer == 0) return;
auto& bufferObj = MG_State_T::bufferState->buffers_[buffer];
if (bufferObj.isDynamic) return; // Dynamic buffer should be created by glDraw*
Diligent::IBuffer* pBuffer = MG_Diligent::g_BufferMap[buffer];
if (pBuffer) {
const auto& Desc = pBuffer->GetDesc();
if (Desc.Usage == Diligent::USAGE_STAGING || Desc.Usage == Diligent::USAGE_DYNAMIC || Desc.Usage == Diligent::USAGE_UNIFIED) {
void* pMappedData = nullptr;
MG_Diligent::g_pContext->MapBuffer(pBuffer, Diligent::MAP_WRITE, Diligent::MAP_FLAG_DISCARD, pMappedData);
if (pMappedData)
{
memcpy(static_cast<Diligent::Uint8*>(pMappedData) + offset, data, size);
MG_Diligent::g_pContext->UnmapBuffer(pBuffer, Diligent::MAP_WRITE);
} else {
MG_Util::Debug::LogE("Failed to map buffer for BufferSubData");
}
} else {
// For USAGE_DEFAULT or USAGE_IMMUTABLE, use UpdateBuffer
MG_Diligent::g_pContext->UpdateBuffer(pBuffer, static_cast<Diligent::Uint64>(offset),
static_cast<Diligent::Uint64>(size), data,
Diligent::RESOURCE_STATE_TRANSITION_MODE_TRANSITION);
}
}
}
void DeleteBuffers(GLsizei n, const GLuint *buffers) {
MG_Util::Debug::LogD("glDeleteBuffers, n: %d, buffers: %p", n, buffers);
GLenum result = MG_State::DeleteBuffers(n, buffers);
if (result == GL_NO_ERROR) {
for (GLsizei i = 0; i < n; ++i) {
GLuint buffer = buffers[i];
if (buffer != 0) {
auto it = MG_Diligent::g_BufferMap.find(buffer);
if (it != MG_Diligent::g_BufferMap.end()) {
if (it->second) {
it->second->Release();
}
MG_Diligent::g_BufferMap.erase(it);
}
}
}
return;
}
MG_State::SetError(result);
MG_Util::Debug::LogE("Error from MG State: %s", MG_Util::Debug::GLEnumToString(result));
}
}
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