| // Copyright 2019 The Dawn Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "dawn_native/opengl/BackendGL.h" |
| |
| #include "dawn_native/OpenGLBackend.h" |
| #include "dawn_native/opengl/DeviceGL.h" |
| |
| namespace dawn_native { namespace opengl { |
| |
| // The OpenGL backend's Adapter. |
| |
| class Adapter : public AdapterBase { |
| public: |
| Adapter(InstanceBase* instance) : AdapterBase(instance, BackendType::OpenGL) { |
| } |
| |
| MaybeError Initialize(const AdapterDiscoveryOptions* options) { |
| // Use getProc to populate the dispatch table |
| DAWN_TRY(mFunctions.Initialize(options->getProc)); |
| |
| // Set state that never changes between devices. |
| mFunctions.Enable(GL_DEPTH_TEST); |
| mFunctions.Enable(GL_SCISSOR_TEST); |
| mFunctions.Enable(GL_PRIMITIVE_RESTART_FIXED_INDEX); |
| mFunctions.Enable(GL_MULTISAMPLE); |
| |
| mPCIInfo.name = reinterpret_cast<const char*>(mFunctions.GetString(GL_RENDERER)); |
| |
| return {}; |
| } |
| |
| ~Adapter() override = default; |
| |
| private: |
| OpenGLFunctions mFunctions; |
| |
| ResultOrError<DeviceBase*> CreateDeviceImpl(const DeviceDescriptor* descriptor) override { |
| // There is no limit on the number of devices created from this adapter because they can |
| // all share the same backing OpenGL context. |
| return {new Device(this, descriptor, mFunctions)}; |
| } |
| }; |
| |
| // Implementation of the OpenGL backend's BackendConnection |
| |
| Backend::Backend(InstanceBase* instance) : BackendConnection(instance, BackendType::OpenGL) { |
| } |
| |
| std::vector<std::unique_ptr<AdapterBase>> Backend::DiscoverDefaultAdapters() { |
| // The OpenGL backend needs at least "getProcAddress" to discover an adapter. |
| return {}; |
| } |
| |
| ResultOrError<std::vector<std::unique_ptr<AdapterBase>>> Backend::DiscoverAdapters( |
| const AdapterDiscoveryOptionsBase* optionsBase) { |
| // TODO(cwallez@chromium.org): For now only create a single OpenGL adapter because don't |
| // know how to handle MakeCurrent. |
| if (mCreatedAdapter) { |
| return DAWN_VALIDATION_ERROR("The OpenGL backend can only create a single adapter"); |
| } |
| |
| ASSERT(optionsBase->backendType == BackendType::OpenGL); |
| const AdapterDiscoveryOptions* options = |
| static_cast<const AdapterDiscoveryOptions*>(optionsBase); |
| |
| if (options->getProc == nullptr) { |
| return DAWN_VALIDATION_ERROR("AdapterDiscoveryOptions::getProc must be set"); |
| } |
| |
| std::unique_ptr<Adapter> adapter = std::make_unique<Adapter>(GetInstance()); |
| DAWN_TRY(adapter->Initialize(options)); |
| |
| mCreatedAdapter = true; |
| std::vector<std::unique_ptr<AdapterBase>> adapters; |
| adapters.push_back(std::unique_ptr<AdapterBase>(adapter.release())); |
| return std::move(adapters); |
| } |
| |
| BackendConnection* Connect(InstanceBase* instance) { |
| return new Backend(instance); |
| } |
| |
| }} // namespace dawn_native::opengl |