/*
 * Copyright (c) Advanced Micro Devices, Inc., or its affiliates.
 *
 * SPDX-License-Identifier: MIT
 */

#include "OCLGLCommon.h"

struct OCLGLHandle_ {
  HDC hdc;
  HGLRC hglrc;
};

OCLGLCommon::OCLGLCommon() {
  hGL_ = new OCLGLHandle_;

  hGL_->hdc = NULL;
  hGL_->hglrc = NULL;
}

OCLGLCommon::~OCLGLCommon() { destroyGLContext(hGL_); }

void OCLGLCommon::destroyGLContext(OCLGLHandle& hGL) {
  deleteGLContext(hGL);
  delete hGL;
  hGL = NULL;
}

void OCLGLCommon::deleteGLContext(OCLGLHandle& hGL) {
  wglMakeCurrent(NULL, NULL);
  if (hGL->hglrc) {
    wglDeleteContext(hGL->hglrc);
    hGL->hglrc = NULL;
  }
  if (hGL->hdc) {
    DeleteDC(hGL->hdc);
    hGL->hdc = NULL;
  }
}

bool OCLGLCommon::createGLContext(OCLGLHandle& hGL) {
  hGL = new OCLGLHandle_;
  return initializeGLContext(hGL);
}

bool OCLGLCommon::initializeGLContext(OCLGLHandle& hGL) {
  BOOL glErr = FALSE;
  DISPLAY_DEVICE dispDevice;
  DWORD deviceNum;
  int pfmt;
  PIXELFORMATDESCRIPTOR pfd;
  pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR);
  pfd.nVersion = 1;
  pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
  pfd.iPixelType = PFD_TYPE_RGBA;
  pfd.cColorBits = 24;
  pfd.cRedBits = 8;
  pfd.cRedShift = 0;
  pfd.cGreenBits = 8;
  pfd.cGreenShift = 0;
  pfd.cBlueBits = 8;
  pfd.cBlueShift = 0;
  pfd.cAlphaBits = 8;
  pfd.cAlphaShift = 0;
  pfd.cAccumBits = 0;
  pfd.cAccumRedBits = 0;
  pfd.cAccumGreenBits = 0;
  pfd.cAccumBlueBits = 0;
  pfd.cAccumAlphaBits = 0;
  pfd.cDepthBits = 24;
  pfd.cStencilBits = 8;
  pfd.cAuxBuffers = 0;
  pfd.iLayerType = PFD_MAIN_PLANE;
  pfd.bReserved = 0;
  pfd.dwLayerMask = 0;
  pfd.dwVisibleMask = 0;
  pfd.dwDamageMask = 0;

  dispDevice.cb = sizeof(DISPLAY_DEVICE);
  for (deviceNum = 0; EnumDisplayDevices(NULL, deviceNum, &dispDevice, 0); deviceNum++) {
    if (dispDevice.StateFlags & DISPLAY_DEVICE_MIRRORING_DRIVER) {
      continue;
    }

    hGL->hdc = CreateDC(NULL, dispDevice.DeviceName, NULL, NULL);
    if (!hGL->hdc) {
      continue;
    }

    pfmt = ChoosePixelFormat(hGL->hdc, &pfd);
    if (pfmt == 0) {
      printf("Failed choosing the requested PixelFormat.\n");
      return false;
    }

    glErr = SetPixelFormat(hGL->hdc, pfmt, &pfd);
    if (glErr == FALSE) {
      printf("Failed to set the requested PixelFormat.\n");
      return false;
    }

    hGL->hglrc = wglCreateContext(hGL->hdc);
    if (NULL == hGL->hglrc) {
      printf("wglCreateContext() failed\n");
      return false;
    }

    glErr = wglMakeCurrent(hGL->hdc, hGL->hglrc);
    if (FALSE == glErr) {
      printf("wglMakeCurrent() failed\n");
      return false;
    }

    if (!checkAssociationDeviceWithGLContext(hGL)) {
      deleteGLContext(hGL);
      return false;
    }

    return true;
  }  //  for (deviceNum = 0; EnumDisplayDevices(NULL, deviceNum, &dispDevice,
     //  0); deviceNum++) {

  return false;
}

bool OCLGLCommon::checkAssociationDeviceWithGLContext(OCLGLHandle& hGL) {
  bool ret = false;
  size_t devicesSize = 0;
  cl_context_properties properties[] = {CL_CONTEXT_PLATFORM,
                                        (cl_context_properties)platform_,
                                        CL_GL_CONTEXT_KHR,
                                        (cl_context_properties)hGL->hglrc,
                                        CL_WGL_HDC_KHR,
                                        (cl_context_properties)hGL->hdc,
                                        0};

  error_ = _wrapper->clGetGLContextInfoKHR(properties, CL_DEVICES_FOR_GL_CONTEXT_KHR, 0, NULL,
                                           &devicesSize);
  if (error_ != CL_SUCCESS) {
    printf("clGetGLContextInfoKHR failed (%d)\n", error_);
    return false;
  }

  cl_uint numDevices = (cl_uint)devicesSize / sizeof(cl_device_id);
  cl_device_id* interopDevices = (cl_device_id*)malloc(devicesSize);

  error_ = _wrapper->clGetGLContextInfoKHR(properties, CL_DEVICES_FOR_GL_CONTEXT_KHR, devicesSize,
                                           interopDevices, NULL);
  if (error_ != CL_SUCCESS) {
    printf("clGetGLContextInfoKHR failed (%d)\n", error_);
    free(interopDevices);
    return false;
  }

  // Check that current device can be associated with OpenGL context
  for (unsigned int i = 0; i < numDevices; i++) {
    if (interopDevices[i] == devices_[_deviceId]) {
      ret = true;
      break;
    }
  }

  free(interopDevices);
  return ret;
}

void OCLGLCommon::createCLContextFromGLContext(OCLGLHandle& hGL) {
  cl_context_properties properties[] = {CL_CONTEXT_PLATFORM,
                                        (cl_context_properties)platform_,
                                        CL_GL_CONTEXT_KHR,
                                        (cl_context_properties)hGL->hglrc,
                                        CL_WGL_HDC_KHR,
                                        (cl_context_properties)hGL->hdc,
                                        0};

  // Release current command queue
  if (cmdQueues_[_deviceId]) {
    error_ = _wrapper->clReleaseCommandQueue(cmdQueues_[_deviceId]);
    CHECK_RESULT_NO_RETURN((error_ != CL_SUCCESS), "clReleaseCommandQueue() failed");
  }

  // Release current context
  if (context_) {
    error_ = _wrapper->clReleaseContext(context_);
    CHECK_RESULT_NO_RETURN((error_ != CL_SUCCESS), "clReleaseContext() failed");
  }

  // Create new CL context from GL context
  context_ = clCreateContext(properties, 1, &devices_[_deviceId], NULL, NULL, &error_);
  CHECK_RESULT((error_ != CL_SUCCESS), "clCreateContext() failed (%d)", error_);

  // Create command queue for new context
  cmdQueues_[_deviceId] = _wrapper->clCreateCommandQueue(context_, devices_[_deviceId], 0, &error_);
  CHECK_RESULT((error_ != CL_SUCCESS), "clCreateCommandQueue() failed (%d)", error_);

  GLenum glErr = glewInit();
  CHECK_RESULT((glErr != GLEW_OK), "glewInit() failed");
}

void OCLGLCommon::makeCurrent(OCLGLHandle hGL) {
  if (hGL == NULL) {
    wglMakeCurrent(NULL, NULL);
  } else {
    wglMakeCurrent(hGL->hdc, hGL->hglrc);
  }
}

void OCLGLCommon::getCLContextPropertiesFromGLContext(const OCLGLHandle hGL,
                                                      cl_context_properties properties[7]) {
  if (!properties) return;

  properties[0] = CL_CONTEXT_PLATFORM;
  properties[1] = (cl_context_properties)platform_;
  properties[2] = CL_GL_CONTEXT_KHR;
  properties[3] = (cl_context_properties)hGL->hglrc;
  properties[4] = CL_WGL_HDC_KHR;
  properties[5] = (cl_context_properties)hGL->hdc;
  properties[6] = 0;
}
