/*

 * Copyright 2012 Google Inc.

 *

 * Use of this source code is governed by a BSD-style license that can be

 * found in the LICENSE file.

 */

#ifndef GrContextFactory_DEFINED

#define GrContextFactory_DEFINED

#include "include/gpu/ganesh/GrContextOptions.h"

#include "include/gpu/ganesh/GrDirectContext.h"

#include "include/private/base/SkTArray.h"

#include "tools/gpu/ContextType.h"

#include "tools/gpu/TestContext.h"

#ifdef SK_GL

#include "tools/gpu/gl/GLTestContext.h"

#endif

namespace skgpu {

struct VulkanBackendContext;

}

namespace sk_gpu_test {

class ContextInfo;

/**

 * This is a simple class that is useful in test apps that use different

 * GrContexts backed by different types of GL contexts. It manages creating the

 * GL context and a GrContext that uses it. The GL/Gr contexts persist until the

 * factory is destroyed (though the caller can always grab a ref on the returned

 * Gr and GL contexts to make them outlive the factory).

 */

class GrContextFactory : SkNoncopyable {

public:

    using ContextType = skgpu::ContextType;

    /**

     * Overrides for the initial GrContextOptions provided at construction time, and required

     * features that will cause context creation to fail if not present.

     */

    enum class ContextOverrides {

        kNone                          = 0x0,

        kAvoidStencilBuffers           = 0x1,

        kFakeGLESVersionAs2            = 0x2,

        kReducedShaders                = 0x4,

    };

    explicit GrContextFactory(const GrContextOptions& opts);

    GrContextFactory();

    ~GrContextFactory();

    void destroyContexts();

    void abandonContexts();

    void releaseResourcesAndAbandonContexts();

    /**

     * Get a context initialized with a type of GL context. It also makes the GL context current.

     */

    ContextInfo getContextInfo(ContextType type, ContextOverrides = ContextOverrides::kNone);

    /**

     * Get a context in the same share group as the passed in GrContext, with the same type and

     * overrides. To get multiple contexts in a single share group, pass the same shareContext,

     * with different values for shareIndex.

     */

    ContextInfo getSharedContextInfo(GrDirectContext* shareContext, uint32_t shareIndex = 0);

    /**

     * Get a GrContext initialized with a type of GL context. It also makes the GL context current.

     */

    GrDirectContext* get(ContextType type, ContextOverrides overrides = ContextOverrides::kNone);

    const GrContextOptions& getGlobalOptions() const { return fGlobalOptions; }

private:

    ContextInfo getContextInfoInternal(ContextType type, ContextOverrides overrides,

                                       GrDirectContext* shareContext, uint32_t shareIndex);

    struct Context {

        ContextType       fType;

        ContextOverrides  fOverrides;

        GrContextOptions  fOptions;

        GrBackendApi      fBackend;

        TestContext*      fTestContext;

        GrDirectContext*  fGrContext;

        GrDirectContext*  fShareContext;

        uint32_t          fShareIndex;

        bool              fAbandoned;

    };

    skia_private::TArray<Context, true> fContexts;

#ifdef SK_GL

    std::unique_ptr<GLTestContext>      fSentinelGLContext;

#endif

    const GrContextOptions              fGlobalOptions;

};

class ContextInfo {

public:

    ContextInfo() = default;

    ContextInfo(const ContextInfo&) = default;

    ContextInfo& operator=(const ContextInfo&) = default;

    skgpu::ContextType type() const { return fType; }

    GrBackendApi backend() const { return skgpu::ganesh::ContextTypeBackend(fType); }

    GrDirectContext* directContext() const { return fContext; }

    TestContext* testContext() const { return fTestContext; }

#ifdef SK_GL

    GLTestContext* glContext() const {

        SkASSERT(GrBackendApi::kOpenGL == this->backend());

        return static_cast<GLTestContext*>(fTestContext);

    }

#endif

    const GrContextOptions& options() const { return fOptions; }

private:

    ContextInfo(skgpu::ContextType type,

                TestContext* testContext,

                GrDirectContext* context,

                const GrContextOptions& options)

            : fType(type), fTestContext(testContext), fContext(context), fOptions(options) {}

    skgpu::ContextType fType = skgpu::ContextType::kGL;

    // Valid until the factory destroys it via abandonContexts() or destroyContexts().

    TestContext* fTestContext = nullptr;

    GrDirectContext* fContext = nullptr;

    GrContextOptions fOptions;

    friend class GrContextFactory;

};

}  // namespace sk_gpu_test

SK_MAKE_BITFIELD_CLASS_OPS(sk_gpu_test::GrContextFactory::ContextOverrides)

#endif