OpenCL _does_work_ on many AMD GPUs that are "not officially supported".
For a simple C file with a .cl kernel file, the compile command would look something like this:
gcc -std=c99 -Wall -DUNIX -g -DDEBUG -m64 -o add_numbers add_numbers.c -lOpenCL
The following Makefile _may_ help you to compile OpenCL for AMD GPUs
https://github.com/rsnemmen/OpenCL-examples/blob/e2c34f1dfefbd265cfb607c2dd6c82c799eb322a/add_number...
Note the lines
# Check for Linux-AMD
ifdef AMDAPPSDKROOT
INC_DIRS=. $(AMDAPPSDKROOT)/include
ifeq ($(PROC_TYPE),)
LIB_DIRS=$(AMDAPPSDKROOT)/lib/x86
else
LIB_DIRS=$(AMDAPPSDKROOT)/lib/x86_64
endif
else
Also:
You very probably need to set the "local_workgroup_size" and "global_workgroup_size" everywhere that clEnqueueNDRangeKernel(...) is called.
"local_workgroup_size" should be less-than-or-equal-to "Max work group size" from clinfo,
256 for my Rx6400, possibly the same for your Rx7900 xtx. Usually you would choose a power of two, (2^integer).
"global_workgroup_size" should be 'the total number of work items' divided by "local_workgroup_size".
Obviously, if you hard code these then you are writing for one model of GPU. Better would be to query the device parameters when you create the clContext for that clPlatform and clDevice.
