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[Feat] (MG_Impl/VertexArray): implement client-side buffer

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This commit is contained in:
swung0x48
2026-06-07 13:02:58 +08:00
parent fbaf5261e2
commit ad1ca4ea92
5 changed files with 118 additions and 12 deletions
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MobileGL/MG_Backend/DirectGLES/Managers.cpp
+89
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@@ -194,10 +194,34 @@ namespace MobileGL::MG_Backend::DirectGLES {
} // namespace BufferImpl
namespace VertexArrayImpl {
namespace {
SizeT GetDataTypeSize(DataType type) {
switch (type) {
case DataType::Int8:
case DataType::Uint8:
return 1;
case DataType::Int16:
case DataType::Uint16:
case DataType::Float16:
return 2;
case DataType::Int32:
case DataType::Uint32:
case DataType::Float32:
case DataType::Fixed32:
return 4;
case DataType::Float64:
return 8;
default:
return 0;
}
}
} // namespace
BackendVertexArrayObject::BackendVertexArrayObject() {
#ifdef TRACY_ENABLE
ZoneScopedC(TRACY_ZONECOLOR_BACKEND);
#endif
m_clientAttributeBufferIds.fill(0);
g_GLESFuncs.glGenVertexArrays(1, &m_backendVAOId);
if (m_backendVAOId == 0) {
MGLOG_E("Failed to generate vertex array object.");
@@ -207,6 +231,19 @@ namespace MobileGL::MG_Backend::DirectGLES {
}
}
BackendVertexArrayObject::~BackendVertexArrayObject() {
if (m_backendVAOId != 0) {
g_GLESFuncs.glDeleteVertexArrays(1, &m_backendVAOId);
m_backendVAOId = 0;
}
for (auto& bufferId : m_clientAttributeBufferIds) {
if (bufferId != 0) {
g_GLESFuncs.glDeleteBuffers(1, &bufferId);
bufferId = 0;
}
}
}
void BackendVertexArrayObject::Bind() const {
#ifdef TRACY_ENABLE
ZoneScopedC(TRACY_ZONECOLOR_BACKEND);
@@ -312,6 +349,58 @@ namespace MobileGL::MG_Backend::DirectGLES {
m_syncedAttributeVersions = allAttributeVersions;
}
void BackendVertexArrayObject::SyncClientSideAttributesForDrawArrays(
const SharedPtr<MG_State::GLState::VertexArrayObject>& stateVAOObject, GLint first, GLsizei count) {
if (!stateVAOObject || count <= 0 || first < 0) {
return;
}
Bind();
const auto& allAttributes = stateVAOObject->GetAllAttributes();
for (Uint attribIndex = 0; attribIndex < allAttributes.size(); ++attribIndex) {
const auto& attrib = allAttributes[attribIndex];
if (!attrib.Enabled || attrib.Buffer) {
continue;
}
const auto* clientData = reinterpret_cast<const Uint8*>(attrib.Offset);
const SizeT componentSize = GetDataTypeSize(attrib.Type);
if (!clientData || componentSize == 0 || attrib.Size <= 0) {
continue;
}
const SizeT elementSize = componentSize * static_cast<SizeT>(attrib.Size);
const SizeT stride = attrib.Stride > 0 ? static_cast<SizeT>(attrib.Stride) : elementSize;
const SizeT uploadSize = static_cast<SizeT>(first + count - 1) * stride + elementSize;
auto& bufferId = m_clientAttributeBufferIds[attribIndex];
if (bufferId == 0) {
g_GLESFuncs.glGenBuffers(1, &bufferId);
if (bufferId == 0) {
MGLOG_E("Failed to create client-side vertex attribute upload buffer.");
continue;
}
}
g_GLESFuncs.glBindBuffer(GL_ARRAY_BUFFER, bufferId);
g_GLESFuncs.glBufferData(GL_ARRAY_BUFFER, static_cast<GLsizeiptr>(uploadSize), clientData,
GL_STREAM_DRAW);
if (!attrib.IsInteger) {
g_GLESFuncs.glVertexAttribPointer(
attribIndex, attrib.Size, MG_Util::ConvertDataTypeToGLEnum(attrib.Type),
attrib.Normalized ? GL_TRUE : GL_FALSE, static_cast<GLsizei>(stride), nullptr);
} else {
g_GLESFuncs.glVertexAttribIPointer(attribIndex, attrib.Size,
MG_Util::ConvertDataTypeToGLEnum(attrib.Type),
static_cast<GLsizei>(stride), nullptr);
}
}
BufferImpl::g_boundVertexBufferObject = nullptr;
}
StateBackendObjectRegistry<MG_State::GLState::VertexArrayObject, BackendVertexArrayObject>
g_backendVertexArrayObjects;
} // namespace VertexArrayImpl