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116 lines
3.9 KiB
Markdown
116 lines
3.9 KiB
Markdown
# OpenCL<sup>TM</sup> API Headers
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This repository contains C language headers for the OpenCL API.
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The authoritative public repository for these headers is located at:
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https://github.com/KhronosGroup/OpenCL-Headers
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Issues, proposed fixes for issues, and other suggested changes should be
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created using Github.
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## Build instructions
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> While the OpenCL Headers can be built and installed in isolation, it is part of the [OpenCL SDK](https://github.com/KhronosGroup/OpenCL-SDK). If looking for streamlined build experience and a complete development package, refer to the SDK build instructions instead of the following guide.
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### Dependencies
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- The OpenCL Headers CMake package support uses CMake for its build system.
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If CMake is not provided by your build system or OS package manager, please consult the [CMake website](https://cmake.org).
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### Example Build
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While the headers may just be copied as-is, this repository also contains a
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CMake script with an install rule to allow for packaging the headers.
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```bash
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cmake -S . -B build -DCMAKE_INSTALL_PREFIX=/chosen/install/prefix
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cmake --build build --target install
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```
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### Example Use
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Example CMake invocation
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```bash
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cmake -D CMAKE_PREFIX_PATH=/chosen/install/prefix /path/to/opencl/app
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```
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and sample `CMakeLists.txt`
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```cmake
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cmake_minimum_required(VERSION 3.0)
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cmake_policy(VERSION 3.0...3.18.4)
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project(proj)
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add_executable(app main.cpp)
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find_package(OpenCLHeaders REQUIRED)
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target_link_libraries(app PRIVATE OpenCL::Headers)
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```
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## Branch Structure
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The OpenCL API headers in this repository are Unified headers and are designed
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to work with all released OpenCL versions. This differs from previous OpenCL
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API headers, where version-specific API headers either existed in separate
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branches, or in separate folders in a branch.
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## Compiling for a Specific OpenCL Version
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By default, the OpenCL API headers in this repository are for the latest
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OpenCL version (currently OpenCL 3.0). To use these API headers to target
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a different OpenCL version, an application may `#define` the preprocessor
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value `CL_TARGET_OPENCL_VERSION` before including the OpenCL API headers.
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The `CL_TARGET_OPENCL_VERSION` is a three digit decimal value representing
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the OpenCL API version.
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For example, to enforce usage of no more than the OpenCL 1.2 APIs, you may
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include the OpenCL API headers as follows:
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```c
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#define CL_TARGET_OPENCL_VERSION 120
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#include <CL/opencl.h>
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```
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## Controlling Function Prototypes
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By default, the OpenCL API headers in this repository declare function
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prototypes for every known core OpenCL API and OpenCL extension API. If this is
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not desired, the declared function prototypes can be controlled by the following
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preprocessor defines:
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* `CL_NO_PROTOTYPES`: No function prototypes will be declared. This control
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applies to core OpenCL APIs and OpenCL extension APIs.
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* `CL_NO_CORE_PROTOTYPES`: No function prototypes will be declared for core
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OpenCL APIs.
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* `CL_NO_EXTENSION_PROTOTYPES`: No function prototypes will be declared for
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OpenCL extension APIs. This control applies to all OpenCL extension APIs.
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* `CL_NO_ICD_DISPATCH_EXTENSION_PROTOTYPES`: No function prototypes will be
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declared for OpenCL extension APIs that are in the ICD dispatch table for
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historical reasons.
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* `CL_NO_NON_ICD_DISPATCH_EXTENSION_PROTOTYPES`: No function prototypes will be
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declared for OpenCL extension APIs that are not in the ICD dispatch table.
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For example, to declare function prototypes for core OpenCL 3.0 APIs only, you
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may include the OpenCL API headers as follows:
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```c
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#define CL_TARGET_OPENCL_VERSION 300
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#define CL_NO_EXTENSION_PROTOTYPES
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#include <CL/opencl.h>
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```
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## Directory Structure
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```
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README.md This file
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LICENSE Source license for the OpenCL API headers
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CL/ Unified OpenCL API headers tree
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```
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## License
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See [LICENSE](LICENSE).
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---
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OpenCL and the OpenCL logo are trademarks of Apple Inc. used by permission by Khronos.
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