CL / GL interop. clCreateFromGLBuffer return CL_OUT_OF_RESOURCES on GeForce GTX 1070 (Linux with Nvi...

Hello

I’ve got a weird issue trying to run the following code.
It works well when I disable CL GL sharing or running on CPU.

Nvidia oclSimpleGL works well with CL GL interop.

Any ideas?

Guillaume

This is part of gnuradio, gr-fosphor.

/*

  • cl.c
  • OpenCL base routines
  • Copyright © 2013-2014 Sylvain Munaut
  • This program is free software: you can redistribute it and/or modify
  • it under the terms of the GNU General Public License as published by
  • the Free Software Foundation, either version 3 of the License, or
  • (at your option) any later version.
  • This program is distributed in the hope that it will be useful,
  • but WITHOUT ANY WARRANTY; without even the implied warranty of
  • MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  • GNU General Public License for more details.
  • You should have received a copy of the GNU General Public License
  • along with this program. If not, see http://www.gnu.org/licenses/.
    */

/*! \addtogroup cl

  • @{
    */

/*! \file cl.c

  • \brief OpenCL base routines
    */

#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include “cl_platform.h”
#include “cl_compat.h”

#if defined(APPLE) || defined(MACOSX)

include <OpenGL/OpenGL.h>

include <OpenGL/gl.h>

#elif defined(_WIN32)

include <windows.h>

include <wingdi.h>

#else

include <GL/glx.h>

#endif

#include “cl.h”
#include “gl.h”
#include “private.h”
#include “resource.h”

struct fosphor_cl_features
{
#define FLG_CL_GL_SHARING (1<<0)
#define FLG_CL_NVIDIA_SM11 (1<<1)
#define FLG_CL_OPENCL_11 (1<<2)
#define FLG_CL_LOCAL_ATOMIC_EXT (1<<3)

cl_device_type type;
char vendor[128];
unsigned long local_mem;
int flags;
int wg_size;
int wg_size_dim[2];

};

struct fosphor_cl_state
{
cl_platform_id pl_id;
cl_device_id dev_id;
cl_context ctx;
cl_command_queue cq;

/* Features */
struct fosphor_cl_features feat;

/* FFT */
cl_mem		mem_fft_in;
cl_mem		mem_fft_out;
cl_mem		mem_fft_win;

cl_program	prog_fft;
cl_kernel	kern_fft;

float		*fft_win;
int		fft_win_updated;

/* Display */
cl_mem		mem_waterfall;
cl_mem		mem_histogram;
cl_mem		mem_spectrum;

cl_program	prog_display;
cl_kernel	kern_display;

/* Histogram range */
float		histo_scale;
float		histo_offset;

/* State */
int		waterfall_pos;
enum {
	CL_BOOTING = 0,
	CL_PENDING,
	CL_READY,
} state;

};

/* -------------------------------------------------------------------------- /
/
Helpers / Internal API /
/
-------------------------------------------------------------------------- */

#define MAX_PLATFORMS 16
#define MAX_DEVICES 16

#define CL_ERR_CHECK(v, msg)
if ((v) != CL_SUCCESS) {
fprintf(stderr, “[!] CL Error (%d, %s:%d): %s\n”,
(v), FILE, LINE, msg);
goto error;
}

static int
cl_device_query(cl_device_id dev_id, struct fosphor_cl_features *feat)
{
char txt[2048];
cl_int err;
int has_nv_attr;

memset(feat, 0x00, sizeof(struct fosphor_cl_features));

/* Device type */
err = clGetDeviceInfo(dev_id, CL_DEVICE_TYPE, sizeof(cl_device_type), &feat->type, NULL);
if (err != CL_SUCCESS)
	return -1;

/* Vendor */
err = clGetDeviceInfo(dev_id, CL_DEVICE_VENDOR, sizeof(feat->vendor)-1, &feat->vendor, NULL);
if (err != CL_SUCCESS)
	return -1;

/* Local memory size */
err = clGetDeviceInfo(dev_id, CL_DEVICE_LOCAL_MEM_SIZE, sizeof(cl_ulong), &feat->local_mem, NULL);
if (err != CL_SUCCESS)
	return -1;

/* CL/GL extension */
err = clGetDeviceInfo(dev_id, CL_DEVICE_EXTENSIONS, sizeof(txt)-1, txt, NULL);
if (err != CL_SUCCESS)
	return -1;

txt = 0;

/*  Check for CL/GL sharing */
if (strstr(txt, "cl_khr_gl_sharing") || strstr(txt, "cl_APPLE_gl_sharing"))
	feat->flags |= FLG_CL_GL_SHARING;

/* Check for NV attributes */
has_nv_attr = !!strstr(txt, "cl_nv_device_attribute_query");

/* Check for cl_khr_local_int32_base_atomics extension */
if (strstr(txt, "cl_khr_local_int32_base_atomics"))
	feat->flags |= FLG_CL_LOCAL_ATOMIC_EXT;

/* Check OpenCL 1.1 compat */
err = clGetDeviceInfo(dev_id, CL_DEVICE_VERSION, sizeof(txt)-1, txt, NULL);
if (err != CL_SUCCESS)
	return -1;

txt = 0;

if (!memcmp(txt, "OpenCL 1.", 9) && txt[9] >= '1')
	feat->flags |= FLG_CL_OPENCL_11;

/* Check if a NVidia SM11 architecture */
if (has_nv_attr) {
	cl_uint nv_maj, nv_min;

	err = clGetDeviceInfo(dev_id, CL_DEVICE_COMPUTE_CAPABILITY_MAJOR_NV,
	                      sizeof(cl_uint), &nv_maj, NULL);
	if (err != CL_SUCCESS)
		return -1;

	err = clGetDeviceInfo(dev_id, CL_DEVICE_COMPUTE_CAPABILITY_MINOR_NV,
	                      sizeof(cl_uint), &nv_min, NULL);
	if (err != CL_SUCCESS)
		return -1;

	if ((nv_maj == 1) && (nv_min == 1))
		feat->flags |= FLG_CL_NVIDIA_SM11;
}

#ifdef APPLE
else if (!(feat->flags & (FLG_CL_OPENCL_11 | FLG_CL_LOCAL_ATOMIC_EXT)))
{
/*
* OSX doesn’t allow query of NV attributes even on NVidia
* cards so we just assume any non-opencl 1.1 nvidia card
* without cl_khr_local_int32_base_atomics extension
* that does OpenCL is a SM1.1 one
*/
err = clGetDeviceInfo(dev_id, CL_DEVICE_VENDOR, sizeof(txt)-1, txt, NULL);
if (err != CL_SUCCESS)
return -1;

	txt = 0;

	if (!!strstr(txt, "NVIDIA"))
		feat->flags |= FLG_CL_NVIDIA_SM11;
}

#endif

return 0;

}

static int
cl_device_score(cl_device_id dev_id, struct fosphor_cl_features *feat)
{
int rv, score = 0;

/* Query device */
rv = cl_device_query(dev_id, feat);
if (rv)
	return rv;

/* Check compatibility */
if (!(feat->flags & (FLG_CL_NVIDIA_SM11 | FLG_CL_OPENCL_11 | FLG_CL_LOCAL_ATOMIC_EXT)))
	return -1;

/* Prefer device with CL/GL sharing */
if (feat->flags & FLG_CL_GL_SHARING)
	score += 500;

/* Prefer GPU (preferrably NVidia / AMD) */
if (feat->type == CL_DEVICE_TYPE_GPU)
{
	char vendor;
	int i;

	score += 1000;

	for (i=0; i<sizeof(feat->vendor); i++)
		vendor[i] = tolower(feat->vendor[i]);

	if (strstr(vendor, "nvidia") ||
	    strstr(vendor, "advanced micro devices") ||
	    strstr(vendor, "amd"))
		score += 500;
}

/* Bigger local mem */
score += (feat->local_mem < (1<<20)) ? (feat->local_mem >> 11) : (1 << 9);

return score;

}

static int
cl_find_device(cl_platform_id *pl_id_p, cl_device_id *dev_id_p,
struct fosphor_cl_features *feat)
{
cl_platform_id pl_list[MAX_PLATFORMS], pl_id;
cl_device_id dev_list[MAX_DEVICES], dev_id;
cl_uint pl_count, dev_count, i, j;
cl_int err;
int score = -1;

/* Scan each platforms */
err = clGetPlatformIDs(MAX_PLATFORMS, pl_list, &pl_count);
CL_ERR_CHECK(err, "Unable to fetch platform IDs");

for (i=0; i<pl_count; i++)
{
	/* Scan all devices */
	err = clGetDeviceIDs(pl_list[i], CL_DEVICE_TYPE_ALL, MAX_DEVICES, dev_list, &dev_count);
	if (err != CL_SUCCESS)
	{
		fprintf(stderr, "[w] CL Error (%d, %s:%d): "
			"Unable to fetch device IDs for platform %d. Skipping.\n",
			err, __FILE__, __LINE__, i);
		continue;
	}

	for (j=0; j<dev_count; j++)
	{
		struct fosphor_cl_features feat_cur;
		int s = cl_device_score(dev_list[j], &feat_cur);
		if (s > score) {
			pl_id  = pl_list[i];
			dev_id = dev_list[j];
			memcpy(feat, &feat_cur, sizeof(struct fosphor_cl_features));
			score = s;
		}
	}
}

/* Did we get a good fit ? */
if (score >= 0) {
	*pl_id_p  = pl_id;
	*dev_id_p = dev_id;
	err = 0;
} else {
	err = -ENODEV;
}

error:
return err;
}

static cl_program
cl_load_program(cl_device_id dev_id, cl_context ctx,
const char *resource_name, const char *opts,
cl_int *err_ptr)
{
cl_program prog = NULL;
const char *src;
cl_int err;

/* Grab resource */
src = resource_get(resource_name, NULL);
if (!src) {
	fprintf(stderr, "[!] Unable to load non-existent resource '%s'\n", resource_name);
	err = CL_INVALID_VALUE;
	goto error;
}

/* Create the program from sources */
prog = clCreateProgramWithSource(ctx, 1, (const char **)&src, NULL, &err);
CL_ERR_CHECK(err, "Failed to create program");

    /* Build it */
    err = clBuildProgram(prog, 0, NULL, opts, NULL, NULL);

#ifndef DEBUG_CL
if (err != CL_SUCCESS)
#endif
{
size_t len;
const int txt_buf_len = 1024 * 1024;
char *txt_buf;

	txt_buf = malloc(txt_buf_len);
            clGetProgramBuildInfo(prog, dev_id, CL_PROGRAM_BUILD_LOG, txt_buf_len, txt_buf, &len);
            fprintf(stderr, "Build log for '%s':\n%s\n\n---\n", resource_name, txt_buf);
	free(txt_buf);
    }

CL_ERR_CHECK(err, "Failed to build program");

#ifdef DEBUG_CL
{
size_t bin_len;
char name_buf[256];
char *bin_buf;

	snprintf(name_buf, 256, "prog_%s.bin", resource_name);

	clGetProgramInfo(prog, CL_PROGRAM_BINARY_SIZES, sizeof(size_t), &bin_len, NULL);
	fprintf(stderr, "Binary length for '%s': %d\n\n", resource_name, (int)bin_len);

	bin_buf = malloc(bin_len);

	clGetProgramInfo(prog, CL_PROGRAM_BINARIES, sizeof(char *), &bin_buf, NULL );

	FILE *fh = fopen(name_buf, "wb");
	if (fwrite(bin_buf, bin_len, 1, fh) != 1)
		fprintf(stderr, "[w] Binary write failed\n");
	fclose(fh);

	free(bin_buf);
}

#endif

/* All good */
return prog;

/* Error path */

error:
if (prog)
clReleaseProgram(prog);

if (err_ptr)
	*err_ptr = err;

return NULL;

}

static int
cl_queue_clear_buffers(struct fosphor *self)
{
struct fosphor_cl_state *cl = self->cl;
float noise_floor, color[4] = {0.0f, 0.0f, 0.0f, 0.0f};
size_t img_origin[3] = {0.0f, 0.0f, 0.0f}, img_region[3];
cl_int err;

/* Configure noise floor to the bottom of the scale */
noise_floor = - self->power.offset;

/* Init spectrum to noise floor */
err = clEnqueueFillBuffer(cl->cq,
	cl->mem_spectrum,
	&noise_floor, sizeof(float),
	0,
	2 * 2 * sizeof(cl_float) * FOSPHOR_FFT_LEN,
	0, NULL, NULL
);
CL_ERR_CHECK(err, "Unable to queue clear of spectrum buffer");

/* Init the waterfall image to noise floor */
color[0] = noise_floor;

img_region[0] = FOSPHOR_FFT_LEN;
img_region[1] = 1024;
img_region[2] = 1;

err = clEnqueueFillImage(cl->cq,
	cl->mem_waterfall,
	color,
	img_origin, img_region,
	0, NULL, NULL
);
CL_ERR_CHECK(err, "Unable to queue clear of waterfall image");

/* Init the histogram image to all 0.0f values */
color[0] = 0.0f;

img_region[0] = FOSPHOR_FFT_LEN;
img_region[1] = 128;
img_region[2] = 1;

err = clEnqueueFillImage(cl->cq,
	cl->mem_histogram,
	color,
	img_origin, img_region,
	0, NULL, NULL
);
CL_ERR_CHECK(err, "Unable to queue clear of histogram image");

/* Need to finish because our patterns are on the stack */
clFinish(cl->cq);

return 0;

/* Error path */

error:
return err;
}

static int
cl_init_buffers_gl(struct fosphor *self)
{
struct fosphor_cl_state *cl = self->cl;
cl_int err;

/* GL shared objects */
	/* Waterfall texture */
cl->mem_waterfall = clCreateFromGLTexture(cl->ctx,
	CL_MEM_WRITE_ONLY, GL_TEXTURE_2D, 0,
	fosphor_gl_get_shared_id(self, GL_ID_TEX_WATERFALL),
	&err
);
CL_ERR_CHECK(err, "Unable to share waterfall texture into OpenCL context");

	/* Histogram texture */
cl->mem_histogram = clCreateFromGLTexture(cl->ctx,
	CL_MEM_READ_WRITE, GL_TEXTURE_2D, 0,
	fosphor_gl_get_shared_id(self, GL_ID_TEX_HISTOGRAM),
	&err
);
CL_ERR_CHECK(err, "Unable to share histogram texture into OpenCL context");

	/* Spectrum VBO */
cl->mem_spectrum = clCreateFromGLBuffer(cl->ctx,
	CL_MEM_WRITE_ONLY,
	fosphor_gl_get_shared_id(self, GL_ID_VBO_SPECTRUM),
	&err
);
CL_ERR_CHECK(err, "Unable to share spectrum VBO into OpenCL context");

/* All done */
err = 0;

error:
return err;
}

static int
cl_init_buffers_nogl(struct fosphor *self)
{
struct fosphor_cl_state *cl = self->cl;
cl_image_format img_fmt;
cl_image_desc img_desc;
cl_int err;

/* Common settings */
img_fmt.image_channel_order = CL_R;
img_fmt.image_channel_data_type = CL_FLOAT;

img_desc.image_type = CL_MEM_OBJECT_IMAGE2D;
img_desc.image_width = FOSPHOR_FFT_LEN;
img_desc.image_depth = 0;
img_desc.image_array_size = 0;
img_desc.image_row_pitch = 0;
img_desc.image_slice_pitch = 0;
img_desc.num_mip_levels = 0;
img_desc.num_samples = 0;
img_desc.buffer = NULL;

/* Waterfall texture */
img_desc.image_height = 1024;

cl->mem_waterfall = clCreateImage(
	cl->ctx,
	CL_MEM_WRITE_ONLY,
	&img_fmt,
	&img_desc,
	NULL,
	&err
);
CL_ERR_CHECK(err, "Unable to create waterfall image");

/* Histogram texture */
img_desc.image_height = 128;

cl->mem_histogram = clCreateImage(
	cl->ctx,
	CL_MEM_READ_WRITE,
	&img_fmt,
	&img_desc,
	NULL,
	&err
);
CL_ERR_CHECK(err, "Unable to create histogram image");

/* Spectrum VBO */
cl->mem_spectrum = clCreateBuffer(
	cl->ctx,
	CL_MEM_READ_WRITE,
	2 * 2 * sizeof(cl_float) * FOSPHOR_FFT_LEN,
	NULL,
	&err
);
CL_ERR_CHECK(err, "Unable to create spectrum VBO buffer");

/* All done */
err = 0;

error:
return err;
}

static int
cl_do_init(struct fosphor *self)
{
struct fosphor_cl_state *cl = self->cl;
cl_context_properties ctx_props[7];
const char *disp_opts;
cl_int err;

/* Setup some options */
if ((cl->feat.type == CL_DEVICE_TYPE_GPU) &&
    (cl->feat.flags & FLG_CL_GL_SHARING))
{
	/* Only use CLGL sharing with GPU. Most CPU impl of it will
	 * just fail with float textures */
	self->flags |= FLG_FOSPHOR_USE_CLGL_SHARING;
}

/* Context */
ctx_props[0] = 0;

if (self->flags & FLG_FOSPHOR_USE_CLGL_SHARING)
{
	/* Setup context properties */

#if defined(APPLE) || defined(MACOSX)

		/* OSX variant */
	ctx_props[0] = CL_CONTEXT_PROPERTY_USE_CGL_SHAREGROUP_APPLE;
	ctx_props[1] = (cl_context_properties) CGLGetShareGroup(CGLGetCurrentContext());
	ctx_props[2] = 0;

#elif defined(_WIN32)

		/* Win 32 variant */
	ctx_props[0] = CL_GL_CONTEXT_KHR;
	ctx_props[1] = (cl_context_properties) wglGetCurrentContext();
	ctx_props[2] = CL_WGL_HDC_KHR;
	ctx_props[3] = (cl_context_properties) wglGetCurrentDC();
	ctx_props[4] = CL_CONTEXT_PLATFORM;
	ctx_props[5] = (cl_context_properties) cl->pl_id;
	ctx_props[6] = 0;

#else

		/* Linux variant */
	ctx_props[0] = CL_GL_CONTEXT_KHR;
	ctx_props[1] = (cl_context_properties) glXGetCurrentContext();
	ctx_props[2] = CL_GLX_DISPLAY_KHR;
	ctx_props[3] = (cl_context_properties) glXGetCurrentDisplay();
	ctx_props[4] = CL_CONTEXT_PLATFORM;
	ctx_props[5] = (cl_context_properties) cl->pl_id;
	ctx_props[6] = 0;

#endif

	/* Attempt to create context */
	cl->ctx = clCreateContext(ctx_props, 1, &cl->dev_id, NULL, NULL, &err);
	if (err != CL_SUCCESS) {
		/* Failed, we'll retry again without CL/GL sharing */
		fprintf(stderr, "[w] CL Error (%d, %s:%d): "
			"Unable to create context with CL/GL sharing, retrying without\n",
			err, __FILE__, __LINE__);

		self->flags &= ~FLG_FOSPHOR_USE_CLGL_SHARING;
		ctx_props[0] = 0;
	}
}

if (!(self->flags & FLG_FOSPHOR_USE_CLGL_SHARING))
{
	cl->ctx = clCreateContext(ctx_props, 1, &cl->dev_id, NULL, NULL, &err);
	CL_ERR_CHECK(err, "Unable to create context");
}

/* Command Queue */
cl->cq = clCreateCommandQueue(cl->ctx, cl->dev_id, 0, &err);
CL_ERR_CHECK(err, "Unable to create command queue");

/* FFT buffers */
cl->mem_fft_in = clCreateBuffer(cl->ctx,
	CL_MEM_READ_ONLY,
	2 * sizeof(cl_float) * FOSPHOR_FFT_LEN * FOSPHOR_FFT_MAX_BATCH,
	NULL,
	&err
);
CL_ERR_CHECK(err, "Unable to allocate FFT input buffer");

cl->mem_fft_out = clCreateBuffer(cl->ctx,
	CL_MEM_READ_WRITE,
	2 * sizeof(cl_float) * FOSPHOR_FFT_LEN * FOSPHOR_FFT_MAX_BATCH,
	NULL,
	&err
);
CL_ERR_CHECK(err, "Unable to allocate FFT output buffer");

cl->mem_fft_win = clCreateBuffer(cl->ctx,
	CL_MEM_READ_ONLY,
	2 * sizeof(cl_float) * FOSPHOR_FFT_LEN,
	NULL,
	&err
);
CL_ERR_CHECK(err, "Unable to allocate FFT window buffer");

/* FFT program/kernels */
cl->prog_fft = cl_load_program(cl->dev_id, cl->ctx, "fft.cl", NULL, &err);
if (!cl->prog_fft)
	goto error;

cl->kern_fft = clCreateKernel(cl->prog_fft, "fft1D_1024", &err);
CL_ERR_CHECK(err, "Unable to create FFT kernel");

/* Configure static FFT kernel args */
err  = clSetKernelArg(cl->kern_fft, 0, sizeof(cl_mem), &cl->mem_fft_in);
err |= clSetKernelArg(cl->kern_fft, 1, sizeof(cl_mem), &cl->mem_fft_out);
err |= clSetKernelArg(cl->kern_fft, 2, sizeof(cl_mem), &cl->mem_fft_win);

CL_ERR_CHECK(err, "Unable to configure FFT kernel");

/* Display kernel result memory objects */
if (self->flags & FLG_FOSPHOR_USE_CLGL_SHARING)
	err = cl_init_buffers_gl(self);
else
	err = cl_init_buffers_nogl(self);

if (err != CL_SUCCESS)
	goto error;

/* Display program/kernel */
if (cl->feat.flags & FLG_CL_NVIDIA_SM11)
	disp_opts = "-DUSE_NV_SM11_ATOMICS";
else if (!(cl->feat.flags & FLG_CL_OPENCL_11))
	disp_opts = "-DUSE_EXT_ATOMICS";
else
	disp_opts = NULL;

cl->prog_display = cl_load_program(cl->dev_id, cl->ctx, "display.cl", disp_opts, &err);
if (!cl->prog_display)
	goto error;

cl->kern_display = clCreateKernel(cl->prog_display, "display", &err);
CL_ERR_CHECK(err, "Unable to create display kernel");

/* Configure static display kernel args */
cl_uint fft_log2_len = FOSPHOR_FFT_LEN_LOG;
cl_float histo_t0r   = 16.0f;
cl_float histo_t0d   = 1024.0f;
cl_float live_alpha  = 0.002f;

err  = clSetKernelArg(cl->kern_display,  0, sizeof(cl_mem),   &cl->mem_fft_out);
err |= clSetKernelArg(cl->kern_display,  1, sizeof(cl_int),   &fft_log2_len);

err |= clSetKernelArg(cl->kern_display,  3, sizeof(cl_mem),   &cl->mem_waterfall);

err |= clSetKernelArg(cl->kern_display,  5, sizeof(cl_mem),   &cl->mem_histogram);
err |= clSetKernelArg(cl->kern_display,  6, sizeof(cl_mem),   &cl->mem_histogram);
err |= clSetKernelArg(cl->kern_display,  7, sizeof(cl_float), &histo_t0r);
err |= clSetKernelArg(cl->kern_display,  8, sizeof(cl_float), &histo_t0d);

err |= clSetKernelArg(cl->kern_display, 11, sizeof(cl_mem),   &cl->mem_spectrum);
err |= clSetKernelArg(cl->kern_display, 12, sizeof(cl_float), &live_alpha);

CL_ERR_CHECK(err, "Unable to configure display kernel");

/* All done */
err = 0;

error:
return err;
}

static void
cl_do_release(struct fosphor_cl_state *cl)
{
if (cl->kern_display)
clReleaseKernel(cl->kern_display);

if (cl->prog_display)
	clReleaseProgram(cl->prog_display);

if (cl->mem_spectrum)
	clReleaseMemObject(cl->mem_spectrum);

if (cl->mem_histogram)
	clReleaseMemObject(cl->mem_histogram);

if (cl->mem_waterfall)
	clReleaseMemObject(cl->mem_waterfall);

if (cl->kern_fft)
	clReleaseKernel(cl->kern_fft);

if (cl->prog_fft)
	clReleaseProgram(cl->prog_fft);

if (cl->mem_fft_win)
	clReleaseMemObject(cl->mem_fft_win);

if (cl->mem_fft_out)
	clReleaseMemObject(cl->mem_fft_out);

if (cl->mem_fft_in)
	clReleaseMemObject(cl->mem_fft_in);

if (cl->cq)
	clReleaseCommandQueue(cl->cq);

if (cl->ctx)
	clReleaseContext(cl->ctx);

}

/* -------------------------------------------------------------------------- /
/
Exposed API /
/
-------------------------------------------------------------------------- */

int
fosphor_cl_init(struct fosphor *self)
{
struct fosphor_cl_state *cl;
char dev_name[128];
cl_int err;

/* Allocate structure */
cl = malloc(sizeof(struct fosphor_cl_state));
if (!cl)
	return -ENOMEM;

self->cl = cl;

memset(cl, 0, sizeof(struct fosphor_cl_state));

cl->state = CL_BOOTING;

/* Find suitable device */
if (cl_find_device(&cl->pl_id, &cl->dev_id, &cl->feat)) {
	fprintf(stderr, "[!] No suitable OpenCL device found\n");
	goto error;
}

/* Report selected device */
err = clGetDeviceInfo(cl->dev_id, CL_DEVICE_NAME, sizeof(dev_name)-1, dev_name, NULL);
CL_ERR_CHECK(err, "Unable to fetch device name");

fprintf(stderr, "[+] Selected device: %s\n", dev_name);

/* Setup compatibility layer for this platform */
cl_compat_init();
cl_compat_check_platform(cl->pl_id);

/* Initialize selected platform / device */
err = cl_do_init(self);
if (err)
	goto error;

/* Done */
return 0;

/* Error path */

error:
fosphor_cl_release(self);

return -EIO;

}

void
fosphor_cl_release(struct fosphor *self)
{
struct fosphor_cl_state *cl = self->cl;

/* Safety */
if (!cl)
	return;

/* Release all allocated OpenCL resources */
cl_do_release(cl);

/* Release structure */
free(cl);

/* Nothing left */
self->cl = NULL;

}

int
fosphor_cl_process(struct fosphor *self,
void *samples, int len)
{
struct fosphor_cl_state *cl = self->cl;

cl_int err;
size_t local[2], global[2];
int n_spectra = len / FOSPHOR_FFT_LEN;

/* Validate batch size */
if (len & ((FOSPHOR_FFT_MULT_BATCH*FOSPHOR_FFT_LEN)-1))
	return -EINVAL;

if (len > (FOSPHOR_FFT_LEN * FOSPHOR_FFT_MAX_BATCH))
	return -EINVAL;

/* Copy new window if needed */
if (cl->fft_win_updated) {
	err = clEnqueueWriteBuffer(
		cl->cq,
		cl->mem_fft_win,
		CL_FALSE,
		0, sizeof(cl_float) * FOSPHOR_FFT_LEN, cl->fft_win,
		0, NULL, NULL
	);
	CL_ERR_CHECK(err, "Unable to copy data to FFT window buffer");

	cl->fft_win_updated = 0;
}

/* Copy samples data */
err = clEnqueueWriteBuffer(
	cl->cq,
	cl->mem_fft_in,
	CL_FALSE,
	0, 2 * sizeof(cl_float) * len, samples,
	0, NULL, NULL
);
CL_ERR_CHECK(err, "Unable to copy data to FFT input buffer");

/* Execute FFT kernel */
global[0] = FOSPHOR_FFT_LEN / 8;
global[1] = n_spectra;

local[0] = global[0];
local[1] = 1;

err = clEnqueueNDRangeKernel(cl->cq, cl->kern_fft, 2, NULL, global, local, 0, NULL, NULL);
CL_ERR_CHECK(err, "Unable to queue FFT kernel execution");

/* Capture all GL objects */
if ((cl->state != CL_PENDING) && (self->flags & FLG_FOSPHOR_USE_CLGL_SHARING)) {
	cl_mem objs[3];

	objs[0] = cl->mem_waterfall;
	objs[1] = cl->mem_histogram;
	objs[2] = cl->mem_spectrum;

	err = clEnqueueAcquireGLObjects(cl->cq, 3, objs, 0, NULL, NULL);
	CL_ERR_CHECK(err, "Unable to acquire GL objects");
}

/* If this is the first run, make sure to pre-clear the buffers */
if (cl->state == CL_BOOTING) {
	err = cl_queue_clear_buffers(self);
	if (err != CL_SUCCESS)
		goto error;
}

/* Configure display kernel */
err  = 0;
err |= clSetKernelArg(cl->kern_display,  2, sizeof(cl_int),   &n_spectra);
err |= clSetKernelArg(cl->kern_display,  4, sizeof(cl_int),   &cl->waterfall_pos);
err |= clSetKernelArg(cl->kern_display,  9, sizeof(cl_float), &cl->histo_scale);
err |= clSetKernelArg(cl->kern_display, 10, sizeof(cl_float), &cl->histo_offset);
CL_ERR_CHECK(err, "Unable to configure display kernel");

/* Execute display kernel */
global[0] = FOSPHOR_FFT_LEN;
global[1] = 16;
local[0] = 16;
local[1] = 16;

err = clEnqueueNDRangeKernel(cl->cq, cl->kern_display, 2, NULL, global, local, 0, NULL, NULL);
CL_ERR_CHECK(err, "Unable to queue display kernel execution");

/* Advance waterfall */
cl->waterfall_pos = (cl->waterfall_pos + n_spectra) & 1023;

/* New state */
cl->state = CL_PENDING;

return 0;

error:
return -EIO;
}

int
fosphor_cl_finish(struct fosphor *self)
{
struct fosphor_cl_state *cl = self->cl;

cl_int err;

/* Check if we really need to do anything */
if (cl->state == CL_READY)
	return 0;

/* If no data was processed, we may need to finish the boot */
if (cl->state == CL_BOOTING) {
	/* Acquire GL objects if needed */
	if (self->flags & FLG_FOSPHOR_USE_CLGL_SHARING)
	{
		cl_mem objs[3];

		objs[0] = cl->mem_waterfall;
		objs[1] = cl->mem_histogram;
		objs[2] = cl->mem_spectrum;

		err = clEnqueueAcquireGLObjects(cl->cq, 3, objs, 0, NULL, NULL);
		CL_ERR_CHECK(err, "Unable to acquire GL objects");
	}

	/* Clear the buffers */
	err = cl_queue_clear_buffers(self);
	if (err != CL_SUCCESS)
		goto error;
}

/* Act depending on current mode */
if (self->flags & FLG_FOSPHOR_USE_CLGL_SHARING)
{
	/* If we use CL/GL sharing, we need to release the objects */
	cl_mem objs[3];

	objs[0] = cl->mem_waterfall;
	objs[1] = cl->mem_histogram;
	objs[2] = cl->mem_spectrum;

	err = clEnqueueReleaseGLObjects(cl->cq, 3, objs, 0, NULL, NULL);
	CL_ERR_CHECK(err, "Unable to release GL objects");
}
else
{
	/* If we don't use CL/GL sharing, we need to fetch the results */
	size_t img_origin[3] = { 0, 0, 0 };
	size_t img_region[3] = { 1024, 0, 1 };

		/* Waterfall */
	img_region[1] = 1024;

	err = clEnqueueReadImage(cl->cq,
		cl->mem_waterfall,
		CL_FALSE,
		img_origin,
		img_region,
		0,
		0,
		self->img_waterfall,
		0, NULL, NULL
	);
	CL_ERR_CHECK(err, "Unable to queue readback of waterfall image");

		/* Histogram */
	img_region[1] = 128;

	err = clEnqueueReadImage(cl->cq,
		cl->mem_histogram,
		CL_FALSE,
		img_origin,
		img_region,
		0,
		0,
		self->img_histogram,
		0, NULL, NULL
	);
	CL_ERR_CHECK(err, "Unable to queue readback of histogram image");

		/* Live spectrum */
	err = clEnqueueReadBuffer(cl->cq,
		cl->mem_spectrum,
		CL_FALSE,
		0,
		2 * 2 * sizeof(cl_float) * FOSPHOR_FFT_LEN,
		self->buf_spectrum,
		0, NULL, NULL
	);
	CL_ERR_CHECK(err, "Unable to queue readback of spectrum buffer");
}

/* Ensure CL is done */
clFinish(cl->cq);

/* New state */
cl->state = CL_READY;

return 1;

error:
return -EIO;
}

void
fosphor_cl_load_fft_window(struct fosphor *self, float *win)
{
struct fosphor_cl_state *cl = self->cl;

cl->fft_win = win;
cl->fft_win_updated = 1;

}

int
fosphor_cl_get_waterfall_position(struct fosphor *self)
{
struct fosphor_cl_state *cl = self->cl;

return cl->waterfall_pos;

}

void
fosphor_cl_set_histogram_range(struct fosphor *self,
float scale, float offset)
{
struct fosphor_cl_state *cl = self->cl;

cl->histo_scale  = scale * 128.0f;
cl->histo_offset = offset;

}

/*! @} */

I’m running into the same issue with a GTX1050. Have you made any headway? Do you know if it worked with older versions of the driver?

In the meantime, I’ve found a workaround here: http://lists.osmocom.org/pipermail/osmocom-sdr/2017-June/001594.html

Hello adanowitz,

No infortunatly I keep stuck on it!
I workarounded the same way for make it work.

I didn’t test it with driver older than 375.
Newer are not working as well.

Guillaume