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package cl
// #include <stdlib.h>
// #ifdef __APPLE__
// #include "OpenCL/opencl.h"
// #else
// #include "cl.h"
// #endif
import "C"
import (
"fmt"
"runtime"
"unsafe"
)
type BuildError struct {
Message string
Device *Device
}
func (e BuildError) Error() string {
if e.Device != nil {
return fmt.Sprintf("cl: build error on %q: %s", e.Device.Name(), e.Message)
} else {
return fmt.Sprintf("cl: build error: %s", e.Message)
}
}
type Program struct {
clProgram C.cl_program
devices []*Device
}
func releaseProgram(p *Program) {
if p.clProgram != nil {
C.clReleaseProgram(p.clProgram)
p.clProgram = nil
}
}
func (p *Program) Release() {
releaseProgram(p)
}
func (p *Program) BuildProgram(devices []*Device, options string) error {
var cOptions *C.char
if options != "" {
cOptions = C.CString(options)
defer C.free(unsafe.Pointer(cOptions))
}
var deviceList []C.cl_device_id
var deviceListPtr *C.cl_device_id
numDevices := C.cl_uint(len(devices))
if devices != nil && len(devices) > 0 {
deviceList = buildDeviceIdList(devices)
deviceListPtr = &deviceList[0]
}
if err := C.clBuildProgram(p.clProgram, numDevices, deviceListPtr, cOptions, nil, nil); err != C.CL_SUCCESS {
buffer := make([]byte, 4096)
var bLen C.size_t
var err C.cl_int
for _, dev := range p.devices {
for i := 2; i >= 0; i-- {
err = C.clGetProgramBuildInfo(p.clProgram, dev.id, C.CL_PROGRAM_BUILD_LOG, C.size_t(len(buffer)), unsafe.Pointer(&buffer[0]), &bLen)
if err == C.CL_INVALID_VALUE && i > 0 && bLen < 1024*1024 {
// INVALID_VALUE probably means our buffer isn't large enough
buffer = make([]byte, bLen)
} else {
break
}
}
if err != C.CL_SUCCESS {
return toError(err)
}
if bLen > 1 {
return BuildError{
Device: dev,
Message: string(buffer[:bLen-1]),
}
}
}
return BuildError{
Device: nil,
Message: "build failed and produced no log entries",
}
}
return nil
}
func (p *Program) CreateKernel(name string) (*Kernel, error) {
cName := C.CString(name)
defer C.free(unsafe.Pointer(cName))
var err C.cl_int
clKernel := C.clCreateKernel(p.clProgram, cName, &err)
if err != C.CL_SUCCESS {
return nil, toError(err)
}
kernel := &Kernel{clKernel: clKernel, name: name}
runtime.SetFinalizer(kernel, releaseKernel)
return kernel, nil
}