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#include <mbgl/renderer/backend_scope.hpp>
#include <mbgl/renderer/renderer_backend.hpp>
#include <mbgl/util/thread_local.hpp>
#include <cassert>
namespace mbgl {
static util::ThreadLocal<BackendScope> currentScope;
BackendScope::BackendScope(RendererBackend& backend_, ScopeType scopeType_)
: priorScope(currentScope.get()),
nextScope(nullptr),
backend(backend_),
scopeType(scopeType_) {
if (priorScope) {
assert(priorScope->nextScope == nullptr);
priorScope->nextScope = this;
priorScope->deactivate();
}
activate();
currentScope.set(this);
}
BackendScope::~BackendScope() {
assert(nextScope == nullptr);
deactivate();
if (priorScope) {
priorScope->activate();
currentScope.set(priorScope);
assert(priorScope->nextScope == this);
priorScope->nextScope = nullptr;
} else {
currentScope.set(nullptr);
}
}
void BackendScope::activate() {
if (scopeType == ScopeType::Explicit &&
!(priorScope && this->backend == priorScope->backend) &&
!(nextScope && this->backend == nextScope->backend)) {
// Only activate when set to Explicit and
// only once per RenderBackend
backend.activate();
activated = true;
}
}
void BackendScope::deactivate() {
if (activated &&
!(nextScope && this->backend == nextScope->backend)) {
// Only deactivate when set to Explicit and
// only once per RenderBackend
backend.deactivate();
activated = false;
}
}
bool BackendScope::exists() {
return currentScope.get();
}
} // namespace mbgl
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