//
// Copyright 2019 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// SurfaceMtl.h: Defines the class interface for Metal Surface.

#ifndef LIBANGLE_RENDERER_METAL_SURFACEMTL_H_
#define LIBANGLE_RENDERER_METAL_SURFACEMTL_H_

#import <Metal/Metal.h>
#import <QuartzCore/CALayer.h>
#import <QuartzCore/CAMetalLayer.h>

#include "libANGLE/renderer/FramebufferImpl.h"
#include "libANGLE/renderer/SurfaceImpl.h"
#include "libANGLE/renderer/metal/RenderTargetMtl.h"
#include "libANGLE/renderer/metal/mtl_format_utils.h"
#include "libANGLE/renderer/metal/mtl_resources.h"
#include "libANGLE/renderer/metal/mtl_state_cache.h"

namespace rx
{

class DisplayMtl;

class SurfaceMtl : public SurfaceImpl
{
  public:
    SurfaceMtl(DisplayMtl *display,
               const egl::SurfaceState &state,
               const egl::AttributeMap &attribs);
    ~SurfaceMtl() override;

    void destroy(const egl::Display *display) override;

    egl::Error initialize(const egl::Display *display) override;
    FramebufferImpl *createDefaultFramebuffer(const gl::Context *context,
                                              const gl::FramebufferState &state) override;

    egl::Error makeCurrent(const gl::Context *context) override;
    egl::Error unMakeCurrent(const gl::Context *context) override;
    egl::Error swap(const gl::Context *context) override;
    egl::Error postSubBuffer(const gl::Context *context,
                             EGLint x,
                             EGLint y,
                             EGLint width,
                             EGLint height) override;

    egl::Error querySurfacePointerANGLE(EGLint attribute, void **value) override;
    egl::Error bindTexImage(const gl::Context *context,
                            gl::Texture *texture,
                            EGLint buffer) override;
    egl::Error releaseTexImage(const gl::Context *context, EGLint buffer) override;
    egl::Error getSyncValues(EGLuint64KHR *ust, EGLuint64KHR *msc, EGLuint64KHR *sbc) override;
    egl::Error getMscRate(EGLint *numerator, EGLint *denominator) override;
    void setSwapInterval(EGLint interval) override;
    void setFixedWidth(EGLint width) override;
    void setFixedHeight(EGLint height) override;

    EGLint getWidth() const override;
    EGLint getHeight() const override;

    EGLint isPostSubBufferSupported() const override;
    EGLint getSwapBehavior() const override;

    angle::Result getAttachmentRenderTarget(const gl::Context *context,
                                            GLenum binding,
                                            const gl::ImageIndex &imageIndex,
                                            GLsizei samples,
                                            FramebufferAttachmentRenderTarget **rtOut) override;

  protected:
    // Ensure companion (depth, stencil) textures' size is correct w.r.t color texture.
    angle::Result ensureDepthStencilSizeCorrect(const gl::Context *context,
                                                gl::Framebuffer::DirtyBits *fboDirtyBits);

    mtl::TextureRef mColorTexture;
    mtl::TextureRef mDepthTexture;
    mtl::TextureRef mStencilTexture;

    bool mUsePackedDepthStencil = false;

    mtl::Format mColorFormat;
    mtl::Format mDepthFormat;
    mtl::Format mStencilFormat;

    RenderTargetMtl mColorRenderTarget;
    RenderTargetMtl mDepthRenderTarget;
    RenderTargetMtl mStencilRenderTarget;
};

class WindowSurfaceMtl : public SurfaceMtl
{
  public:
    WindowSurfaceMtl(DisplayMtl *display,
                     const egl::SurfaceState &state,
                     EGLNativeWindowType window,
                     const egl::AttributeMap &attribs);
    ~WindowSurfaceMtl() override;

    void destroy(const egl::Display *display) override;

    egl::Error initialize(const egl::Display *display) override;
    FramebufferImpl *createDefaultFramebuffer(const gl::Context *context,
                                              const gl::FramebufferState &state) override;

    egl::Error makeCurrent(const gl::Context *context) override;
    egl::Error swap(const gl::Context *context) override;

    EGLint getSwapBehavior() const override;

    // width and height can change with client window resizing
    EGLint getWidth() const override;
    EGLint getHeight() const override;

    angle::Result getAttachmentRenderTarget(const gl::Context *context,
                                            GLenum binding,
                                            const gl::ImageIndex &imageIndex,
                                            GLsizei samples,
                                            FramebufferAttachmentRenderTarget **rtOut) override;

  private:
    angle::Result swapImpl(const gl::Context *context);
    angle::Result ensureRenderTargetsCreated(const gl::Context *context);
    angle::Result obtainNextDrawable(const gl::Context *context);

    // Check if metal layer has been resized.
    void checkIfLayerResized();

    mtl::AutoObjCObj<CAMetalLayer> mMetalLayer = nil;
    CALayer *mLayer;
    mtl::AutoObjCPtr<id<CAMetalDrawable>> mCurrentDrawable = nil;
};

}  // namespace rx

#endif /* LIBANGLE_RENDERER_METAL_SURFACEMTL_H_ */
