blob: 1b80d678e5fe43ee8c5bc6c2ab9492f483566680 [file] [log] [blame]
// 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, const AdapterDiscoveryOptions* options)
: AdapterBase(instance, BackendType::OpenGL) {
// Use getProc to populate GLAD.
gladLoadGLLoader(reinterpret_cast<GLADloadproc>(options->getProc));
// Set state that never changes between devices.
glEnable(GL_DEPTH_TEST);
glEnable(GL_SCISSOR_TEST);
glEnable(GL_PRIMITIVE_RESTART_FIXED_INDEX);
mPCIInfo.name = reinterpret_cast<const char*>(glGetString(GL_RENDERER));
}
virtual ~Adapter() = default;
private:
ResultOrError<DeviceBase*> CreateDeviceImpl() 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)};
}
};
// 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 we can only create a single adapter because glad uses
// static variables to store the pointers to OpenGL procs. Also, if we could create
// multiple adapters, we would need to figure out what to do about MakeCurrent.
if (mCreatedAdapter) {
return DAWN_VALIDATION_ERROR("The OpenGL backend can only create a single adapter");
}
ASSERT(optionsBase->backendType == BackendType::OpenGL);
const AdapterDiscoveryOptions* options =
reinterpret_cast<const AdapterDiscoveryOptions*>(optionsBase);
if (options->getProc == nullptr) {
return DAWN_VALIDATION_ERROR("AdapterDiscoveryOptions::getProc must be set");
}
std::vector<std::unique_ptr<AdapterBase>> adapters;
adapters.push_back(std::make_unique<Adapter>(GetInstance(), options));
mCreatedAdapter = true;
return std::move(adapters);
}
BackendConnection* Connect(InstanceBase* instance) {
return new Backend(instance);
}
}} // namespace dawn_native::opengl