/* Copyright (c) 2010 - 2021 Advanced Micro Devices, Inc.

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE. */

#ifndef CL_GL_AMD_HPP_
#define CL_GL_AMD_HPP_

#ifdef _WIN32
#include <windows.h>
#else //!_WIN32
#include <dlfcn.h>
#endif //!_WIN32

#include <GL/gl.h>
#include <GL/glext.h>
#include "CL/cl_gl.h"
#ifndef _WIN32
#include <GL/glx.h>
#endif //!_WIN32

#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <EGL/eglplatform.h>

#include "platform/context.hpp"
#include "platform/command.hpp"

namespace amd
{

//! Class GLObject keeps all the info about the GL object
//! from which the CL object is created
class GLObject : public InteropObject
{
protected:
    cl_gl_object_type   clGLType_;  //!< CL GL object type
    GLenum  glTarget_;
    GLuint  gluiName_;
    GLint   gliMipLevel_;
    GLenum  glInternalFormat_;
    GLint   gliWidth_;
    GLint   gliHeight_;
    GLint   gliDepth_;
    GLenum  glCubemapFace_;
    GLsizei glNumSamples_;

public:
//! GLObject constructor initializes member variables
    GLObject(
        GLenum  glTarget,
        GLuint  gluiName,
        GLint   gliMipLevel,
        GLenum  glInternalFormat,
        GLint   gliWidth,
        GLint   gliHeight,
        GLint   gliDepth,
        cl_gl_object_type   clGLType,
        GLenum  glCubemapFace,
        GLsizei glNumSamples
    ): // Initialization of member variables
            clGLType_(clGLType),
            glTarget_(glTarget),
            gluiName_(gluiName),
            gliMipLevel_(gliMipLevel),
            glInternalFormat_(glInternalFormat),
            gliWidth_(gliWidth),
            gliHeight_(gliHeight),
            gliDepth_(gliDepth),
            glCubemapFace_(glCubemapFace),
            glNumSamples_(glNumSamples)
    {
    }

    virtual ~GLObject() {}
    virtual GLObject* asGLObject() {return this;}

//! GLObject query functions to get GL info from member variables
    GLenum  getGLTarget() const {return glTarget_;}
    GLuint  getGLName() const {return gluiName_;}
    GLint   getGLMipLevel() const {return gliMipLevel_;}
    GLenum  getGLInternalFormat() const {return glInternalFormat_;}
    GLint   getGLSize() const {return gliWidth_;}
    GLint   getGLWidth() const {return gliWidth_;}
    GLint   getGLHeight() const {return gliHeight_;}
    GLint   getGLDepth() const {return gliDepth_;}
    cl_gl_object_type getCLGLObjectType() const { return clGLType_; }
    GLenum  getCubemapFace() const {return glCubemapFace_;}
    GLsizei getNumSamples() const { return glNumSamples_;}
};


//! Class BufferGL is drived from classes Buffer and GLObject
//! where the former keeps all data for CL object and
//! the latter keeps all data for GL object
class BufferGL : public Buffer, public GLObject
{
protected:
    //! Initializes the device memory array which is nested
    // after'BufferGL' object in memory layout.
    virtual void initDeviceMemory();
public:
//! BufferGL constructor just calls constructors of base classes
//! to pass down the parameters
    BufferGL(
        Context&        amdContext,
        cl_mem_flags    clFlags,
        size_t          uiSizeInBytes,
        GLenum          glTarget,
        GLuint          gluiName)
        : // Call base classes constructors
            Buffer(
                amdContext,
                clFlags,
                uiSizeInBytes
            ),
            GLObject(
                glTarget,
                gluiName,
                0,                  // Mipmap level default
                GL_ARRAY_BUFFER,    // Just init to some value
                (GLint) uiSizeInBytes,
                1,
                1,
                CL_GL_OBJECT_BUFFER,
                0,
                0
            )
    {
        setInteropObj(this);
    }
    virtual ~BufferGL() {}

    virtual BufferGL* asBufferGL() { return this; }
};


//! Class ImageGL is derived from classes Image and GLObject
//! where the former keeps all data for CL object and
//! the latter keeps all data for GL object
class ImageGL : public Image, public GLObject
{
public:
    //! ImageGL constructor just calls constructors of base classes
    //! to pass down the parameters
    ImageGL(
        Context&            amdContext,
        cl_mem_object_type  clType,
        cl_mem_flags        clFlags,
        const Format&       format,
        size_t              width,
        size_t              height,
        size_t              depth,
        GLenum              glTarget,
        GLuint              gluiName,
        GLint               gliMipLevel,
        GLenum              glInternalFormat,
        cl_gl_object_type   clGLType,
        GLsizei             numSamples,
        GLenum              glCubemapFace = 0)
        : Image(amdContext, clType, clFlags, format, width, height, depth,
            Format(format).getElementSize() * width,
            Format(format).getElementSize() * width * depth)
        , GLObject(glTarget, gluiName, gliMipLevel, glInternalFormat,
            static_cast<GLint>(width), static_cast<GLint>(height),
            static_cast<GLint>(depth), clGLType, glCubemapFace,numSamples)
    {
        setInteropObj(this);
    }

    virtual ~ImageGL() {}

protected:
    //! Initializes the device memory array which is nested
    // after'BufferGL' object in memory layout.
    virtual void initDeviceMemory();
};

    typedef EGLContext (*PFN_eglGetCurrentContext) ();
#ifdef _WIN32
#define APICALL WINAPI
#define GETPROCADDRESS      GetProcAddress
#define API_GETPROCADDR     "wglGetProcAddress"
#define FCN_STR_TYPE        LPCSTR
    typedef PROC (WINAPI* PFN_xxxGetProcAddress) (LPCSTR fcnName);
    typedef HGLRC (APICALL* PFN_wglCreateContext) (HDC hdc);
    typedef HGLRC (APICALL* PFN_wglGetCurrentContext) (void);
    typedef HDC   (APICALL* PFN_wglGetCurrentDC) (void);
    typedef BOOL  (APICALL* PFN_wglDeleteContext) (HGLRC hglrc);
    typedef BOOL  (APICALL* PFN_wglMakeCurrent) (HDC hdc, HGLRC hglrc);
    typedef BOOL  (APICALL* PFN_wglShareLists) (HGLRC hglrc1, HGLRC hglrc2);
#else //!_WIN32
#define APICALL // __stdcall   //??? todo odintsov
#define API_GETPROCADDR     "glXGetProcAddress"
#define GETPROCADDRESS      dlsym
#define FCN_STR_TYPE        const GLubyte*
#define WINAPI
#define PROC void*
    typedef void* (*PFN_xxxGetProcAddress) (const GLubyte* procName);
    // X11 typedef
    typedef Display* (*PFNXOpenDisplay)(_Xconst char* display_name );
    typedef int (*PFNXCloseDisplay)(Display* display );

    //glx typedefs
    typedef GLXDrawable (*PFNglXGetCurrentDrawable)();
    typedef Display* (*PFNglXGetCurrentDisplay)();
    typedef GLXContext (*PFNglXGetCurrentContext)( void );
    typedef XVisualInfo* (*PFNglXChooseVisual)(Display *dpy, int screen, int *attribList);
    typedef GLXContext(*PFNglXCreateContext)(Display* dpy,XVisualInfo* vis,GLXContext shareList,Bool direct);
    typedef void(*PFNglXDestroyContext)(Display* dpy, GLXContext ctx);
    typedef Bool(*PFNglXMakeCurrent)( Display* dpy, GLXDrawable drawable, GLXContext ctx);
    typedef void* HMODULE;
#endif //!_WIN32

#define GLPREFIX(rtype, fcn, dclargs) \
    typedef rtype (APICALL* PFN_##fcn) dclargs;

// Declare prototypes for GL functions
#include "gl_functions.hpp"

class GLFunctions
{
public:
    //! Locks any access to the virtual GPUs
    class SetIntEnv : public amd::StackObject {
    public:
        //! Default constructor
        SetIntEnv(GLFunctions* env);

        //! Destructor
        ~SetIntEnv();

        //! Checks if the environment setup was successful
        bool isValid() const { return isValid_; }

    private:
        GLFunctions*    env_;       //!< GL environment
        bool            isValid_;   //!< If TRUE, then it's a valid setup
    };

private:
    HMODULE libHandle_;
    int missed_;    // Indicates how many GL functions not init'ed, if any

    amd::Monitor lock_;

    EGLDisplay eglDisplay_;
    EGLContext eglOriginalContext_;
    EGLContext eglInternalContext_;
    EGLContext eglTempContext_;
    bool isEGL_;
    PFN_eglGetCurrentContext eglGetCurrentContext_;

#ifdef _WIN32
    HGLRC       hOrigGLRC_;
    HDC         hDC_;
    HGLRC       hIntGLRC_;  // handle for internal GLRC to access shared context
    HDC         tempDC_;
    HGLRC       tempGLRC_;

public:
    PFN_wglCreateContext     wglCreateContext_;
    PFN_wglGetCurrentContext wglGetCurrentContext_;
    PFN_wglGetCurrentDC      wglGetCurrentDC_;
    PFN_wglDeleteContext     wglDeleteContext_;
    PFN_wglMakeCurrent       wglMakeCurrent_;
    PFN_wglShareLists        wglShareLists_;
#else
public:
    Display*    Dpy_;
    GLXDrawable Drawable_;
    GLXContext  origCtx_;
    Display*    intDpy_;
    Window      intDrawable_;
    GLXContext  intCtx_;
    Display*    tempDpy_;
    GLXDrawable tempDrawable_;
    GLXContext  tempCtx_;

    //pointers to X11 functions
    PFNXOpenDisplay XOpenDisplay_;
    PFNXCloseDisplay XCloseDisplay_;

    //pointers to GLX functions
    PFNglXGetCurrentDrawable glXGetCurrentDrawable_;
    PFNglXGetCurrentDisplay glXGetCurrentDisplay_;
    PFNglXGetCurrentContext glXGetCurrentContext_;
    PFNglXChooseVisual glXChooseVisual_;
    PFNglXCreateContext glXCreateContext_;
    PFNglXDestroyContext glXDestroyContext_;
    PFNglXMakeCurrent glXMakeCurrent_;
#endif
public:

    GLFunctions(HMODULE h, bool isEGL);
    ~GLFunctions();

    bool update(intptr_t hglrc);
    bool IsCurrentGlContext(const amd::Context::Info& info) const {
      if (isEGL_) {
        return ((info.hCtx_ != nullptr) && (eglGetCurrentContext_ != nullptr) &&
                (info.hCtx_ == eglGetCurrentContext_()));
      } else {
#ifdef _WIN32
        return ((info.hCtx_ != nullptr) && (info.hCtx_ == wglGetCurrentContext_()));
#else
        return ((info.hCtx_ != nullptr) && (info.hCtx_ == glXGetCurrentContext_()));
#endif  // _WIN32
      }
    }

    void WaitCurrentGlContext(const amd::Context::Info& info) const;

    // Query CL-GL context association
    bool isAssociated() const
    {
        if (isEGL_ && eglDisplay_ && eglOriginalContext_) return true;
#ifdef _WIN32
        if(hDC_ && hOrigGLRC_) return true;
#else //!_WIN32
        if(Dpy_ && origCtx_) return true;
#endif //!_WIN32
        return false;
    }
    bool isEGL() const
    {
        return isEGL_;
    }
    // Accessor methods
#ifdef _WIN32
    HGLRC getOrigGLRC() const {return hOrigGLRC_;}
    HDC getDC() const {return hDC_;}
    HGLRC getIntGLRC() const {return hIntGLRC_;}
#else //!_WIN32
    Display* getDpy() const {return Dpy_;}
    GLXDrawable getDrawable() const {return Drawable_;}
    GLXContext getOrigCtx() const {return origCtx_;}

    Display* getIntDpy() const {return intDpy_;}
    GLXDrawable getIntDrawable() const {return intDrawable_;}
    GLXContext getIntCtx() const {return intCtx_;}

    EGLDisplay getEglDpy() const { return eglDisplay_; }
    EGLContext getEglOrigCtx() const { return eglOriginalContext_; }
#endif //!_WIN32

    // Initialize GL dynamic library and function pointers
    bool init(intptr_t hdc, intptr_t hglrc);

    // Return true if successful, false - if error occurred
    bool setIntEnv();
    bool restoreEnv();

    amd::Monitor& getLock() { return lock_; }

    PFN_xxxGetProcAddress GetProcAddress_;

#define GLPREFIX(rtype, fcn, dclargs)   \
    PFN_##fcn fcn##_;
// Declare pointers to GL functions
#include "gl_functions.hpp"
};

//! Functions for executing the GL related stuff
cl_mem clCreateFromGLBufferAMD(Context& amdContext, cl_mem_flags flags,
    GLuint bufobj, cl_int* errcode_ret);
cl_mem clCreateFromGLTextureAMD(Context& amdContext, cl_mem_flags flags,
    GLenum target, GLint miplevel, GLuint texture, int* errcode_ret);
cl_mem clCreateFromGLRenderbufferAMD(Context& amdContext, cl_mem_flags flags,
    GLuint renderbuffer, int* errcode_ret);

bool
getCLFormatFromGL(
    const Context& amdContext,
    GLint gliInternalFormat,
    cl_image_format* pclImageFormat,
    int* piBytesPerPixel,
    cl_mem_flags flags
);

} //namespace amd

#endif //CL_GL_AMD_HPP_