opencl

问题 Unlike barrier() (which I think I understand), mem_fence() does not affect all items in the work group. The OpenCL spec says (section 6.11.10), for mem_fence() : Orders loads and stores of a work-item executing a kernel. (so it applies to a single work item). But, at the same time, in section 3.3.1, it says that: Within a work-item memory has load / store consistency. so within a work item the memory is consistent. So what kind of thing is mem_fence() useful for? It doesn't work across items,

问题 I am trying to build an openCL program in Android Studio and keep running into the following issue: Android Studio fatal error: CL/cl.h No such file or directory I have been searching and everything is a solution for "visual studio". I thought it may be helpful if we had a solution listed specifically for Android Studio and this error. Any ideas how to fix this? I see references here appears to be running gcc from command line. I want this to work just from Android Studio. 回答1: OpenCL is not

问题 I am trying to build an openCL program in Android Studio and keep running into the following issue: Android Studio fatal error: CL/cl.h No such file or directory I have been searching and everything is a solution for "visual studio". I thought it may be helpful if we had a solution listed specifically for Android Studio and this error. Any ideas how to fix this? I see references here appears to be running gcc from command line. I want this to work just from Android Studio. 回答1: OpenCL is not

问题 I downloaded the AMD APP 3.0 SDK and as soon as I include #include <CL/cl.hpp> into my cpp it throws deprecation warnings: 1>c:\program files (x86)\amd app sdk\3.0\include\cl\cl.hpp(4240): warning C4996: 'clCreateSampler': was declared deprecated and many more. Am I doing something wrong? I feel uncomfortable starting to play with openCL having so many warnings already before writing a single line of useful code. 回答1: The issue here is that cl.hpp is for OpenCL 1.X platforms, but the rest of

问题 I'm doing a reduction (finding the minimum and maximum) of a float[] array on a GPU through OpenCL. I'm loading the some elements from global memory into local memory for each workgroup. When the global size isn't a multiple of the workgroup size, I pad the global size, such that it becomes a multiple of the global size. Work-items past the end of the array put the neutral element of the reduction into local memory. But what should that neutral element be for max() -- the maximum function?

问题 I'm doing a reduction (finding the minimum and maximum) of a float[] array on a GPU through OpenCL. I'm loading the some elements from global memory into local memory for each workgroup. When the global size isn't a multiple of the workgroup size, I pad the global size, such that it becomes a multiple of the global size. Work-items past the end of the array put the neutral element of the reduction into local memory. But what should that neutral element be for max() -- the maximum function?

问题 I'm doing a reduction (finding the minimum and maximum) of a float[] array on a GPU through OpenCL. I'm loading the some elements from global memory into local memory for each workgroup. When the global size isn't a multiple of the workgroup size, I pad the global size, such that it becomes a multiple of the global size. Work-items past the end of the array put the neutral element of the reduction into local memory. But what should that neutral element be for max() -- the maximum function?

问题 To improve rendering quality I'm writing on a versatile separable downscaler in OpenCL 1.1. The basic image (covering only a small part of the final image) is rendered into a very large framebuffer. Then its color-attached texture is downsampled and placed into another texture via OpenCL. Finally a screen-aligned quad gets rendered to show the result. So far the idea. What do we have: 2 instances of the downscaler-kernel (it stores the results with coordinates exchanged (i.e. as (y,x) )

问题 On my laptop I have two graphic cards - Intel Iris and Nvidia GeForce GT 750M. I am trying to do a simple vector add using OpenCL . I know, that Nvidia card is much faster and can do the job better. In principle, I can put an if statement in the code that will look for NVIDIA in the VENDOR attribute. But I'd like to have something elegant. What is the best way to choose a better (faster) GPU programmatically in OpenCL C/C++ ? 回答1: I developed a real-time ray tracer (not just a ray caster)

问题 I've written an OpenCL kernel in a .cl file. It attempts to #include several headers. Its compilation fails, since the included header files are "not found". I am aware that clBuildProgram can take the -I dir option, which adds the directory dir to the list of directories to be searched for the header files. In the khronus site forum this post http://www.khronos.org/message_boards/viewtopic.php?f=37&t=2535 talks about the issue. They propose to use clCreateProgramWithSource which specifies