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/*
* Adopted from OpenSubdiv with the following license:
*
* Copyright 2015 Pixar
*
* Licensed under the Apache License, Version 2.0 (the "Apache License")
* with the following modification; you may not use this file except in
* compliance with the Apache License and the following modification to it:
* Section 6. Trademarks. is deleted and replaced with:
*
* 6. Trademarks. This License does not grant permission to use the trade
* names, trademarks, service marks, or product names of the Licensor
* and its affiliates, except as required to comply with Section 4(c) of
* the License and to reproduce the content of the NOTICE file.
*
* You may obtain a copy of the Apache License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the Apache License with the above modification is
* distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the Apache License for the specific
* language governing permissions and limitations under the Apache License.
*/
#ifdef OPENSUBDIV_HAS_OPENCL
#ifdef _MSC_VER
# include "iso646.h"
#endif
#include "opensubdiv_device_context_opencl.h"
#if defined(_WIN32)
# include <windows.h>
#elif defined(__APPLE__)
# include <OpenGL/OpenGL.h>
#else
# include <GL/glx.h>
#endif
#include <cstdio>
#include <cstring>
#include <string>
#define message(...) // fprintf(stderr, __VA_ARGS__)
#define error(...) fprintf(stderr, __VA_ARGS__)
/* Returns the first found platform. */
static cl_platform_id findPlatform() {
cl_uint numPlatforms;
cl_int ciErrNum = clGetPlatformIDs(0, NULL, &numPlatforms);
if (ciErrNum != CL_SUCCESS) {
error("Error %d in clGetPlatformIDs call.\n", ciErrNum);
return NULL;
}
if (numPlatforms == 0) {
error("No OpenCL platform found.\n");
return NULL;
}
cl_platform_id *clPlatformIDs = new cl_platform_id[numPlatforms];
ciErrNum = clGetPlatformIDs(numPlatforms, clPlatformIDs, NULL);
char chBuffer[1024];
for (cl_uint i = 0; i < numPlatforms; ++i) {
ciErrNum = clGetPlatformInfo(clPlatformIDs[i], CL_PLATFORM_NAME,
1024, chBuffer,NULL);
if (ciErrNum == CL_SUCCESS) {
cl_platform_id platformId = clPlatformIDs[i];
delete[] clPlatformIDs;
return platformId;
}
}
delete[] clPlatformIDs;
return NULL;
}
/* Return. the device in clDevices which supports the extension. */
static int findExtensionSupportedDevice(cl_device_id *clDevices,
int numDevices,
const char *extensionName) {
/* Find a device that supports sharing with GL/D3D11
* (SLI / X-fire configurations)
*/
cl_int ciErrNum;
for (int i = 0; i < numDevices; ++i) {
/* Get extensions string size. */
size_t extensionSize;
ciErrNum = clGetDeviceInfo(clDevices[i],
CL_DEVICE_EXTENSIONS, 0, NULL,
&extensionSize);
if (ciErrNum != CL_SUCCESS) {
error("Error %d in clGetDeviceInfo\n", ciErrNum);
return -1;
}
if (extensionSize > 0) {
/* Get extensions string. */
char *extensions = new char[extensionSize];
ciErrNum = clGetDeviceInfo(clDevices[i], CL_DEVICE_EXTENSIONS,
extensionSize, extensions,
&extensionSize);
if (ciErrNum != CL_SUCCESS) {
error("Error %d in clGetDeviceInfo\n", ciErrNum);
delete[] extensions;
continue;
}
std::string extString(extensions);
delete[] extensions;
/* Parse string. This is bit deficient since the extentions
* is space separated.
*
* The actual string would be "cl_khr_d3d11_sharing"
* or "cl_nv_d3d11_sharing"
*/
if (extString.find(extensionName) != std::string::npos) {
return i;
}
}
}
return -1;
}
CLDeviceContext::CLDeviceContext()
: _clContext(NULL),
_clCommandQueue(NULL) {
}
CLDeviceContext::~CLDeviceContext() {
if (_clCommandQueue)
clReleaseCommandQueue(_clCommandQueue);
if (_clContext)
clReleaseContext(_clContext);
}
bool CLDeviceContext::HAS_CL_VERSION_1_1()
{
#ifdef OPENSUBDIV_HAS_CLEW
static bool clewInitialized = false;
static bool clewLoadSuccess;
if (not clewInitialized) {
clewInitialized = true;
clewLoadSuccess = clewInit() == CLEW_SUCCESS;
if (!clewLoadSuccess) {
error("Loading OpenCL failed.\n");
}
}
return clewLoadSuccess;
#endif
return true;
}
bool CLDeviceContext::Initialize()
{
#ifdef OPENSUBDIV_HAS_CLEW
if (!clGetPlatformIDs) {
error("Error clGetPlatformIDs function not bound.\n");
return false;
}
#endif
cl_int ciErrNum;
cl_platform_id cpPlatform = findPlatform();
#if defined(_WIN32)
cl_context_properties props[] = {
CL_GL_CONTEXT_KHR, (cl_context_properties)wglGetCurrentContext(),
CL_WGL_HDC_KHR, (cl_context_properties)wglGetCurrentDC(),
CL_CONTEXT_PLATFORM, (cl_context_properties)cpPlatform,
0
};
#elif defined(__APPLE__)
CGLContextObj kCGLContext = CGLGetCurrentContext();
CGLShareGroupObj kCGLShareGroup = CGLGetShareGroup(kCGLContext);
cl_context_properties props[] = {
CL_CONTEXT_PROPERTY_USE_CGL_SHAREGROUP_APPLE, (cl_context_properties)kCGLShareGroup,
0
};
#else
cl_context_properties props[] = {
CL_GL_CONTEXT_KHR, (cl_context_properties)glXGetCurrentContext(),
CL_GLX_DISPLAY_KHR, (cl_context_properties)glXGetCurrentDisplay(),
CL_CONTEXT_PLATFORM, (cl_context_properties)cpPlatform,
0
};
#endif
#if defined(__APPLE__)
_clContext = clCreateContext(props, 0, NULL, clLogMessagesToStdoutAPPLE,
NULL, &ciErrNum);
if (ciErrNum != CL_SUCCESS) {
error("Error %d in clCreateContext\n", ciErrNum);
return false;
}
size_t devicesSize = 0;
clGetGLContextInfoAPPLE(_clContext, kCGLContext,
CL_CGL_DEVICES_FOR_SUPPORTED_VIRTUAL_SCREENS_APPLE,
0, NULL, &devicesSize);
int numDevices = int(devicesSize / sizeof(cl_device_id));
if (numDevices == 0) {
error("No sharable devices.\n");
return false;
}
cl_device_id *clDevices = new cl_device_id[numDevices];
clGetGLContextInfoAPPLE(_clContext, kCGLContext,
CL_CGL_DEVICES_FOR_SUPPORTED_VIRTUAL_SCREENS_APPLE,
numDevices * sizeof(cl_device_id), clDevices, NULL);
int clDeviceUsed = 0;
#else // not __APPLE__
/* Get the number of GPU devices available to the platform. */
cl_uint numDevices = 0;
clGetDeviceIDs(cpPlatform, CL_DEVICE_TYPE_GPU, 0, NULL, &numDevices);
if (numDevices == 0) {
error("No CL GPU device found.\n");
return false;
}
/* Create the device list. */
cl_device_id *clDevices = new cl_device_id[numDevices];
clGetDeviceIDs(cpPlatform, CL_DEVICE_TYPE_GPU, numDevices, clDevices, NULL);
const char *extension = "cl_khr_gl_sharing";
int clDeviceUsed = findExtensionSupportedDevice(clDevices, numDevices,
extension);
if (clDeviceUsed < 0) {
error("No device found that supports CL/GL context sharing\n");
delete[] clDevices;
return false;
}
_clContext = clCreateContext(props, 1, &clDevices[clDeviceUsed],
NULL, NULL, &ciErrNum);
#endif // not __APPLE__
if (ciErrNum != CL_SUCCESS) {
error("Error %d in clCreateContext\n", ciErrNum);
delete[] clDevices;
return false;
}
_clCommandQueue = clCreateCommandQueue(_clContext, clDevices[clDeviceUsed],
0, &ciErrNum);
delete[] clDevices;
if (ciErrNum != CL_SUCCESS) {
error("Error %d in clCreateCommandQueue\n", ciErrNum);
return false;
}
return true;
}
#endif /* OPENSUBDIV_HAS_OPENCL */
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