initial commit

11 files changed, 1500 insertions, 0 deletions

diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..8379def
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,50 @@
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+AllowShortCaseLabelsOnASingleLine: 'false'
+AllowShortFunctionsOnASingleLine: Empty
+AllowShortIfStatementsOnASingleLine: Never
+AllowShortLoopsOnASingleLine: 'false'
+AlwaysBreakAfterReturnType: AllDefinitions
+AlwaysBreakBeforeMultilineStrings: 'false'
+BinPackArguments: 'true'
+BinPackParameters: 'true'
+BreakBeforeBinaryOperators: None
+BreakBeforeBraces: WebKit
+BreakBeforeTernaryOperators: 'false'
+BreakStringLiterals: 'true'
+ColumnLimit: '80'
+ContinuationIndentWidth: '8'
+DerivePointerAlignment: 'false'
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+IndentWrappedFunctionNames: 'false'
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+MaxEmptyLinesToKeep: '1'
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+ReflowComments: 'false'
+SortIncludes: 'true'
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+SpaceAfterLogicalNot: 'false'
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+...
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..578539f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+spirt
+
+compile_commands.json
+
+*.o
+*.tar.gz
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..f288702
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    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 <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..0a49d95
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,75 @@
+# Copyright (C) 2024 Aiden Gall
+#
+# 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/>.
+
+.POSIX:
+
+.PHONY: all clean dist install format
+
+include config.mk
+
+SRC   = src/spirt.c src/util.c src/farbfeld.c
+CLSRC = src/cl/spirt.cl
+HDR   = src/util.h src/farbfeld.h
+
+LL  = ${CLSRC:.cl=.ll}
+SPV = ${CLSRC:.cl=.spv}
+
+OBJ = ${SRC:.c=.o} ${CLSRC:.cl=.o}
+
+all: spirt
+
+src/spirt.o: config.mk src/util.h src/farbfeld.h
+src/util.o: config.mk
+src/farbfeld.o: config.mk src/util.h
+src/cl/spirt.o: config.mk
+
+spirt: ${OBJ}
+	${CC} -o $@ $^ ${LDFLAGS}
+
+%.o: %.c
+	${CC} -c ${CFLAGS} $< -o $@
+
+%.o: %.spv
+	objcopy ${OBJFLAGS} $< $@
+
+%.spv: %.ll
+	llvm-spirv $< -o $@
+
+%.ll: %.cl
+	clang -c ${CLFLAGS} $< -o $@
+
+compile_commands.json: config.mk
+	echo ${SRC} | \
+		jq -nR "[ inputs | split(\" \").[] | { \
+		directory:\".\", \
+		command:(\"${CC} -c ${CFLAGS} \" + .), \
+		file:. } ]" > $@
+
+clean:
+	rm -f spirt ${OBJ} ${LL} ${SPV}
+
+dist: clean
+	mkdir -p spirt-${VERSION}
+	cp -R LICENSE Makefile config.mk src/ .clang-format spirt-${VERSION}
+	tar -cf - spirt-${VERSION} | gzip > spirt-${VERSION}.tar.gz
+	rm -rf spirt-${VERSION}
+
+install: all
+	mkdir -p ${DESTDIR}${PREFIX}/bin
+	cp -f spirt ${DESTDIR}${PREFIX}/bin
+	chmod 755 ${DESTDIR}${PREFIX}/bin/spirt
+
+format:
+	for src in ${SRC} ${HDR} ${CLSRC}; do clang-format -i "$$src"; done
diff --git a/config.mk b/config.mk
new file mode 100644
index 0000000..69656f9
--- /dev/null
+++ b/config.mk
@@ -0,0 +1,20 @@
+VERSION = 0.1
+
+PREFIX = /usr/local
+
+CC = gcc
+
+LIBS = -lOpenCL
+
+CFLAGS = -std=c89 -pedantic -Wall -Wextra -O2 -pipe \
+         -DCL_TARGET_OPENCL_VERSION=210 -D_POSIX_C_SOURCE=200809L
+
+LDFLAGS = -Wl,-O1,--sort-common,--as-needed ${LIBS}
+
+CLFLAGS = -target spir64 -emit-llvm -Xclang -finclude-default-header -O3 \
+          -cl-std=CL1.2 -Wall -Wextra
+
+OBJFLAGS = -I binary -O elf64-x86-64 -B i386:x86-64 \
+           --rename-section .data=.rodata,alloc,load,readonly,data,contents \
+           --add-section ".note.GNU-stack"=/dev/null \
+           --set-section-flags ".note.GNU-stack"=contents,readonly
diff --git a/src/cl/spirt.cl b/src/cl/spirt.cl
new file mode 100644
index 0000000..300f552
--- /dev/null
+++ b/src/cl/spirt.cl
@@ -0,0 +1,33 @@
+/* Copyright (C) 2024 Aiden Gall
+
+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/>. */
+
+__kernel void
+hello(__global ushort *const canvas)
+{
+	size_t idx, w, h, i, j;
+
+	w = get_global_size(0);
+	h = get_global_size(1);
+
+	i = get_global_id(0);
+	j = get_global_id(1);
+
+	idx = (w * j + i) * 4;
+
+	canvas[idx] = (ushort)((65535 * i) / (w - 1));
+	canvas[idx + 1] = (ushort)((65535 * j) / (h - 1));
+	canvas[idx + 2] = 16383;
+	canvas[idx + 3] = 65535;
+}
diff --git a/src/farbfeld.c b/src/farbfeld.c
new file mode 100644
index 0000000..71903b1
--- /dev/null
+++ b/src/farbfeld.c
@@ -0,0 +1,40 @@
+/* Copyright (C) 2024 Aiden Gall
+
+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/>. */
+
+#include "util.h"
+
+#include <arpa/inet.h>
+#include <stdint.h>
+#include <stdio.h>
+
+/* write farbfeld image to fd
+ * - canvas will be mutated unless host architecture is big endian */
+void
+farbfeld_write(FILE *const fd, uint16_t *const canvas, const size_t canvas_size,
+               uint32_t width, uint32_t height)
+{
+	size_t i;
+
+	width = htonl(width);
+	height = htonl(height);
+
+	for (i = 0; i < canvas_size; i++)
+		canvas[i] = htons(canvas[i]);
+
+	efwrite("farbfeld", sizeof(char), 8, fd);
+	efwrite(&width, sizeof(uint32_t), 1, fd);
+	efwrite(&height, sizeof(uint32_t), 1, fd);
+	efwrite(canvas, sizeof(uint16_t), canvas_size, fd);
+}
diff --git a/src/farbfeld.h b/src/farbfeld.h
new file mode 100644
index 0000000..295c2a1
--- /dev/null
+++ b/src/farbfeld.h
@@ -0,0 +1,20 @@
+/* Copyright (C) 2024 Aiden Gall
+
+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/>. */
+
+#include <stdint.h>
+#include <stdio.h>
+
+void farbfeld_write(FILE *fd, uint16_t *canvas, size_t canvas_size,
+                    uint32_t width, uint32_t height);
diff --git a/src/spirt.c b/src/spirt.c
new file mode 100644
index 0000000..d1e8399
--- /dev/null
+++ b/src/spirt.c
@@ -0,0 +1,357 @@
+/* Copyright (C) 2024 Aiden Gall
+
+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/>. */
+
+#include "farbfeld.h"
+#include "util.h"
+
+#include <CL/cl.h>
+#include <CL/cl_platform.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifndef SPIRV_START
+#	define SPIRV_START _binary_src_cl_spirt_spv_start
+#endif
+#ifndef SPIRV_END
+#	define SPIRV_END _binary_src_cl_spirt_spv_end
+#endif
+#define SPIRV_SIZE ((size_t)SPIRV_END - (size_t)SPIRV_START)
+
+struct ClRuntime {
+	cl_platform_id platform;
+	cl_device_id device;
+	cl_context context;
+	cl_command_queue command_queue;
+	cl_program program;
+	cl_kernel k_hello;
+};
+
+static cl_platform_id *get_platforms(cl_uint *num_platforms);
+static cl_device_id *get_devices(cl_platform_id platform, cl_uint *num_devices);
+static cl_program compile_spirv_program(cl_context context, cl_device_id device,
+                                        const void *spirv_start,
+                                        size_t spirv_size);
+
+static struct ClRuntime init(size_t platidx, size_t devidx);
+static uint16_t *run_k_hello(struct ClRuntime *runtime, size_t *canvas_size_ret,
+                             size_t image_width, size_t image_height);
+static void clean(struct ClRuntime *runtime);
+
+static long argtonum(const char *arg, long minval, long maxval);
+
+extern const char *SPIRV_START[];
+extern const char *SPIRV_END[];
+
+static cl_platform_id *
+get_platforms(cl_uint *const num_platforms)
+{
+	cl_int err;
+
+	cl_platform_id *platforms;
+	cl_uint len;
+
+	err = clGetPlatformIDs(0, NULL, &len);
+	if (err != CL_SUCCESS)
+		die("clGetPlatformIDs: %s\n", cl_strerror(err));
+	warn("number of platforms = %d\n", len);
+	if (len < 1)
+		die("clGetPlatformIDs: No OpenCL platforms\n");
+
+	platforms = calloc(len, sizeof(*platforms));
+	if (!platforms)
+		die("calloc: Out of memory\n");
+	err = clGetPlatformIDs(len, platforms, NULL);
+	if (err != CL_SUCCESS)
+		die("clGetPlatformIDs: %s\n", cl_strerror(err));
+
+	*num_platforms = len;
+	return platforms;
+}
+
+static cl_device_id *
+get_devices(const cl_platform_id platform, cl_uint *const num_devices)
+{
+	cl_int err;
+
+	cl_device_id *devices;
+	cl_uint len;
+
+	err = clGetDeviceIDs(platform, CL_DEVICE_TYPE_ALL, 0, NULL, &len);
+	if (err != CL_SUCCESS)
+		die("clGetDeviceIDs: %s\n", cl_strerror(err));
+	warn("number of devices in platform = %d\n", len);
+	if (len < 1)
+		die("clGetDeviceIDs: No OpenCL devices in platform\n");
+
+	devices = calloc(len, sizeof(*devices));
+	if (!devices)
+		die("calloc: Out of memory\n");
+	err = clGetDeviceIDs(platform, CL_DEVICE_TYPE_ALL, len, devices, NULL);
+	if (err != CL_SUCCESS)
+		die("clGetDeviceIDs: %s\n", cl_strerror(err));
+
+	*num_devices = len;
+	return devices;
+}
+
+static cl_program
+compile_spirv_program(const cl_context context, const cl_device_id device,
+                      const void *const spirv_start, const size_t spirv_size)
+{
+	cl_int err, build_err;
+	cl_program program;
+
+	program = clCreateProgramWithIL(context, spirv_start, spirv_size, &err);
+	if (err != CL_SUCCESS)
+		die("clCreateProgramWithIL: %s\n", cl_strerror(err));
+
+	build_err = clBuildProgram(program, 1, &device, NULL, NULL, NULL);
+	if (build_err != CL_SUCCESS) {
+		cl_char *log;
+		size_t buffer_size;
+
+		err = clGetProgramBuildInfo(program, device,
+		                            CL_PROGRAM_BUILD_LOG, 0, NULL,
+		                            &buffer_size);
+		if (err != CL_SUCCESS)
+			die("clGetProgramBuildInfo: %s\n", cl_strerror(err));
+		if (buffer_size < 1)
+			die("clGetProgramBuildInfo: "
+			    "Build log buffer is empty\n");
+
+		log = calloc(buffer_size, sizeof(*log));
+		if (!log)
+			die("calloc: Out of memory\n");
+		err = clGetProgramBuildInfo(
+		        program, device, CL_PROGRAM_BUILD_LOG,
+		        sizeof(*log) * buffer_size, log, NULL);
+		if (err != CL_SUCCESS)
+			die("clGetProgramBuildInfo: %s\n", cl_strerror(err));
+
+		efwrite(log, sizeof(*log), buffer_size, stderr);
+
+		free(log);
+		die("\nclBuildProgram: %s\n", cl_strerror(build_err));
+	}
+
+	return program;
+}
+
+static struct ClRuntime
+init(const size_t platidx, const size_t devidx)
+{
+	cl_int err;
+
+	cl_platform_id *platforms;
+	cl_device_id *devices;
+	cl_uint num_platforms;
+	cl_uint num_devices;
+
+	struct ClRuntime runtime;
+
+	platforms = get_platforms(&num_platforms);
+	if (platidx >= num_platforms)
+		die("get_platforms: Index out of range\n");
+	runtime.platform = platforms[platidx];
+	free(platforms);
+
+	devices = get_devices(runtime.platform, &num_devices);
+	if (devidx >= num_devices)
+		die("get_devices: Index out of range\n");
+	runtime.device = devices[devidx];
+	free(devices);
+
+	runtime.context =
+	        clCreateContext(NULL, 1, &runtime.device, NULL, NULL, &err);
+	if (err != CL_SUCCESS)
+		die("clCreateContext: %s\n", cl_strerror(err));
+
+	runtime.command_queue = clCreateCommandQueueWithProperties(
+	        runtime.context, runtime.device, NULL, &err);
+	if (err != CL_SUCCESS)
+		die("clCreateCommandQueueWithProperties: %s\n",
+		    cl_strerror(err));
+
+	runtime.program = compile_spirv_program(runtime.context, runtime.device,
+	                                        SPIRV_START, SPIRV_SIZE);
+
+	runtime.k_hello = clCreateKernel(runtime.program, "hello", &err);
+	if (err != CL_SUCCESS)
+		die("clCreateKernel: %s\n", cl_strerror(err));
+
+	return runtime;
+}
+
+static uint16_t *
+run_k_hello(struct ClRuntime *const runtime, size_t *const canvas_size_ret,
+            const size_t image_width, const size_t image_height)
+{
+	cl_int err;
+
+	size_t global_item_size[2];
+
+	uint16_t *h_canvas;
+	cl_mem d_canvas;
+	size_t canvas_size;
+
+	canvas_size = (sizeof("RGBA") - 1) * image_width * image_height;
+
+	h_canvas = calloc(canvas_size, sizeof(*h_canvas));
+	if (!h_canvas)
+		die("calloc: Out of memory\n");
+
+	d_canvas = clCreateBuffer(runtime->context, CL_MEM_WRITE_ONLY,
+	                          sizeof(*h_canvas) * canvas_size, NULL, &err);
+	if (err != CL_SUCCESS)
+		die("clCreateBuffer: %s\n", cl_strerror(err));
+
+	err = clSetKernelArg(runtime->k_hello, 0, sizeof(d_canvas), &d_canvas);
+	if (err != CL_SUCCESS)
+		die("clSetKernelArg: %s\n", cl_strerror(err));
+
+	global_item_size[0] = image_width;
+	global_item_size[1] = image_height;
+	err = clEnqueueNDRangeKernel(runtime->command_queue, runtime->k_hello,
+	                             2, NULL, global_item_size, NULL, 0, NULL,
+	                             NULL);
+	if (err != CL_SUCCESS)
+		die("clEnqueueNDRangeKernel: %s\n", cl_strerror(err));
+
+	err = clEnqueueReadBuffer(runtime->command_queue, d_canvas, CL_TRUE, 0,
+	                          sizeof(*h_canvas) * canvas_size, h_canvas, 0,
+	                          NULL, NULL);
+	if (err != CL_SUCCESS)
+		die("clEnqueueReadBuffer: %s\n", cl_strerror(err));
+
+	clReleaseMemObject(d_canvas);
+
+	*canvas_size_ret = canvas_size;
+	return h_canvas;
+}
+
+static void
+clean(struct ClRuntime *const runtime)
+{
+	clFlush(runtime->command_queue);
+	clFinish(runtime->command_queue);
+
+	clReleaseKernel(runtime->k_hello);
+	clReleaseProgram(runtime->program);
+	clReleaseCommandQueue(runtime->command_queue);
+	clReleaseContext(runtime->context);
+}
+
+static long
+argtonum(const char *const arg, const long minval, const long maxval)
+{
+	long ret;
+	char *endptr;
+
+	if (minval > maxval)
+		die("argtonum: Invalid range\n");
+	if (!arg)
+		die("argtonum: Missing argument\n");
+
+	errno = 0;
+	ret = strtol(arg, &endptr, 10);
+	if (errno)
+		die("strtol: %s\n", strerror(errno));
+	if (arg == endptr || *endptr)
+		die("strtol: Invalid integer\n");
+
+	if (ret < minval || ret > maxval)
+		die("argtonum: Argument out of range\n");
+
+	return ret;
+}
+
+int
+main(int argc, char *argv[])
+{
+	long opt_platidx, opt_devidx, opt_width, opt_height;
+	FILE *fd;
+
+	struct ClRuntime runtime;
+
+	uint16_t *h_canvas;
+	size_t canvas_size;
+
+	opt_platidx = 0;
+	opt_devidx = 0;
+	opt_width = 256;
+	opt_height = 256;
+
+	if (argv[0])
+		argv++, argc--;
+
+	for (; argv[0] && argv[0][0] == '-' && argv[0][1]; argv++, argc--) {
+		char flag;
+
+		if (argv[0][2])
+			die("arg_parse: Invalid flag '%s'\n", argv[0]);
+
+		flag = argv[0][1];
+		argv++, argc--;
+
+		switch (flag) {
+		case 'p':
+			opt_platidx = argtonum(argv[0], 0, LONG_MAX);
+			break;
+		case 'd':
+			opt_devidx = argtonum(argv[0], 0, LONG_MAX);
+			break;
+		case 'w':
+			opt_width = argtonum(argv[0], 1, LONG_MAX);
+			break;
+		case 'h':
+			opt_height = argtonum(argv[0], 1, LONG_MAX);
+			break;
+		case '-':
+			goto end_flags;
+		default:
+			die("arg_parse: Unknown flag '-%c'\n", flag);
+		}
+	}
+
+end_flags:
+	if (argc > 1)
+		die("arg_parse: Unexpected argument\n");
+
+	fd = stdout;
+	if (argv[0]) {
+		errno = 0;
+		fd = fopen(argv[0], "w");
+		if (errno)
+			die("fopen: %s\n", strerror(errno));
+		if (!fd)
+			die("fopen: Returned NULL\n");
+	}
+
+	runtime = init(opt_platidx, opt_devidx);
+
+	h_canvas = run_k_hello(&runtime, &canvas_size, opt_width, opt_height);
+
+	farbfeld_write(fd, h_canvas, canvas_size, opt_width, opt_height);
+	fclose(fd);
+
+	free(h_canvas);
+	clean(&runtime);
+
+	return 0;
+}
diff --git a/src/util.c b/src/util.c
new file mode 100644
index 0000000..bf06bca
--- /dev/null
+++ b/src/util.c
@@ -0,0 +1,201 @@
+/* Copyright (C) 2024 Aiden Gall
+
+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/>. */
+
+#include <CL/cl.h>
+#include <CL/cl_platform.h>
+#include <CL/cl_version.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+void warn(const char *fmt, ...);
+void die(const char *fmt, ...);
+
+void efwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream);
+
+const char *cl_strerror(cl_int err);
+
+void
+warn(const char *const fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	vfprintf(stderr, fmt, ap);
+	va_end(ap);
+}
+
+void
+die(const char *const fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	vfprintf(stderr, fmt, ap);
+	va_end(ap);
+
+	exit(EXIT_FAILURE);
+}
+
+void
+efwrite(const void *const ptr, const size_t size, const size_t nmemb,
+        FILE *const stream)
+{
+	if (fwrite(ptr, size, nmemb, stream) != nmemb)
+		die("fwrite: Write failed\n");
+}
+
+const char *
+cl_strerror(const cl_int err)
+{
+	switch (err) {
+	case CL_SUCCESS:
+		return "CL_SUCCESS";
+	case CL_DEVICE_NOT_FOUND:
+		return "CL_DEVICE_NOT_FOUND";
+	case CL_DEVICE_NOT_AVAILABLE:
+		return "CL_DEVICE_NOT_AVAILABLE";
+	case CL_COMPILER_NOT_AVAILABLE:
+		return "CL_COMPILER_NOT_AVAILABLE";
+	case CL_MEM_OBJECT_ALLOCATION_FAILURE:
+		return "CL_MEM_OBJECT_ALLOCATION_FAILURE";
+	case CL_OUT_OF_RESOURCES:
+		return "CL_OUT_OF_RESOURCES";
+	case CL_OUT_OF_HOST_MEMORY:
+		return "CL_OUT_OF_HOST_MEMORY";
+	case CL_PROFILING_INFO_NOT_AVAILABLE:
+		return "CL_PROFILING_INFO_NOT_AVAILABLE";
+	case CL_MEM_COPY_OVERLAP:
+		return "CL_MEM_COPY_OVERLAP";
+	case CL_IMAGE_FORMAT_MISMATCH:
+		return "CL_IMAGE_FORMAT_MISMATCH";
+	case CL_IMAGE_FORMAT_NOT_SUPPORTED:
+		return "CL_IMAGE_FORMAT_NOT_SUPPORTED";
+	case CL_BUILD_PROGRAM_FAILURE:
+		return "CL_BUILD_PROGRAM_FAILURE";
+	case CL_MAP_FAILURE:
+		return "CL_MAP_FAILURE";
+	case CL_INVALID_VALUE:
+		return "CL_INVALID_VALUE";
+	case CL_INVALID_DEVICE_TYPE:
+		return "CL_INVALID_DEVICE_TYPE";
+	case CL_INVALID_PLATFORM:
+		return "CL_INVALID_PLATFORM";
+	case CL_INVALID_DEVICE:
+		return "CL_INVALID_DEVICE";
+	case CL_INVALID_CONTEXT:
+		return "CL_INVALID_CONTEXT";
+	case CL_INVALID_QUEUE_PROPERTIES:
+		return "CL_INVALID_QUEUE_PROPERTIES";
+	case CL_INVALID_COMMAND_QUEUE:
+		return "CL_INVALID_COMMAND_QUEUE";
+	case CL_INVALID_HOST_PTR:
+		return "CL_INVALID_HOST_PTR";
+	case CL_INVALID_MEM_OBJECT:
+		return "CL_INVALID_MEM_OBJECT";
+	case CL_INVALID_IMAGE_FORMAT_DESCRIPTOR:
+		return "CL_INVALID_IMAGE_FORMAT_DESCRIPTOR";
+	case CL_INVALID_IMAGE_SIZE:
+		return "CL_INVALID_IMAGE_SIZE";
+	case CL_INVALID_SAMPLER:
+		return "CL_INVALID_SAMPLER";
+	case CL_INVALID_BINARY:
+		return "CL_INVALID_BINARY";
+	case CL_INVALID_BUILD_OPTIONS:
+		return "CL_INVALID_BUILD_OPTIONS";
+	case CL_INVALID_PROGRAM:
+		return "CL_INVALID_PROGRAM";
+	case CL_INVALID_PROGRAM_EXECUTABLE:
+		return "CL_INVALID_PROGRAM_EXECUTABLE";
+	case CL_INVALID_KERNEL_NAME:
+		return "CL_INVALID_KERNEL_NAME";
+	case CL_INVALID_KERNEL_DEFINITION:
+		return "CL_INVALID_KERNEL_DEFINITION";
+	case CL_INVALID_KERNEL:
+		return "CL_INVALID_KERNEL";
+	case CL_INVALID_ARG_INDEX:
+		return "CL_INVALID_ARG_INDEX";
+	case CL_INVALID_ARG_VALUE:
+		return "CL_INVALID_ARG_VALUE";
+	case CL_INVALID_ARG_SIZE:
+		return "CL_INVALID_ARG_SIZE";
+	case CL_INVALID_KERNEL_ARGS:
+		return "CL_INVALID_KERNEL_ARGS";
+	case CL_INVALID_WORK_DIMENSION:
+		return "CL_INVALID_WORK_DIMENSION";
+	case CL_INVALID_WORK_GROUP_SIZE:
+		return "CL_INVALID_WORK_GROUP_SIZE";
+	case CL_INVALID_WORK_ITEM_SIZE:
+		return "CL_INVALID_WORK_ITEM_SIZE";
+	case CL_INVALID_GLOBAL_OFFSET:
+		return "CL_INVALID_GLOBAL_OFFSET";
+	case CL_INVALID_EVENT_WAIT_LIST:
+		return "CL_INVALID_EVENT_WAIT_LIST";
+	case CL_INVALID_EVENT:
+		return "CL_INVALID_EVENT";
+	case CL_INVALID_OPERATION:
+		return "CL_INVALID_OPERATION";
+	case CL_INVALID_GL_OBJECT:
+		return "CL_INVALID_GL_OBJECT";
+	case CL_INVALID_BUFFER_SIZE:
+		return "CL_INVALID_BUFFER_SIZE";
+	case CL_INVALID_MIP_LEVEL:
+		return "CL_INVALID_MIP_LEVEL";
+	case CL_INVALID_GLOBAL_WORK_SIZE:
+		return "CL_INVALID_GLOBAL_WORK_SIZE";
+#ifdef CL_VERSION_1_1
+	case CL_MISALIGNED_SUB_BUFFER_OFFSET:
+		return "CL_MISALIGNED_SUB_BUFFER_OFFSET";
+	case CL_EXEC_STATUS_ERROR_FOR_EVENTS_IN_WAIT_LIST:
+		return "CL_EXEC_STATUS_ERROR_FOR_EVENTS_IN_WAIT_LIST";
+	case CL_INVALID_PROPERTY:
+		return "CL_INVALID_PROPERTY";
+#endif
+#ifdef CL_VERSION_1_2
+	case CL_COMPILE_PROGRAM_FAILURE:
+		return "CL_COMPILE_PROGRAM_FAILURE";
+	case CL_LINKER_NOT_AVAILABLE:
+		return "CL_LINKER_NOT_AVAILABLE";
+	case CL_LINK_PROGRAM_FAILURE:
+		return "CL_LINK_PROGRAM_FAILURE";
+	case CL_DEVICE_PARTITION_FAILED:
+		return "CL_DEVICE_PARTITION_FAILED";
+	case CL_KERNEL_ARG_INFO_NOT_AVAILABLE:
+		return "CL_KERNEL_ARG_INFO_NOT_AVAILABLE";
+	case CL_INVALID_IMAGE_DESCRIPTOR:
+		return "CL_INVALID_IMAGE_DESCRIPTOR";
+	case CL_INVALID_COMPILER_OPTIONS:
+		return "CL_INVALID_COMPILER_OPTIONS";
+	case CL_INVALID_LINKER_OPTIONS:
+		return "CL_INVALID_LINKER_OPTIONS";
+	case CL_INVALID_DEVICE_PARTITION_COUNT:
+		return "CL_INVALID_DEVICE_PARTITION_COUNT";
+#endif
+#ifdef CL_VERSION_2_0
+	case CL_INVALID_PIPE_SIZE:
+		return "CL_INVALID_PIPE_SIZE";
+	case CL_INVALID_DEVICE_QUEUE:
+		return "CL_INVALID_DEVICE_QUEUE";
+#endif
+#ifdef CL_VERSION_2_2
+	case CL_INVALID_SPEC_ID:
+		return "CL_INVALID_SPEC_ID";
+	case CL_MAX_SIZE_RESTRICTION_EXCEEDED:
+		return "CL_MAX_SIZE_RESTRICTION_EXCEEDED";
+#endif
+	default:
+		return "OpenCL unknown error";
+	}
+}
diff --git a/src/util.h b/src/util.h
new file mode 100644
index 0000000..d36746c
--- /dev/null
+++ b/src/util.h
@@ -0,0 +1,24 @@
+/* Copyright (C) 2024 Aiden Gall
+
+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/>. */
+
+#include <CL/cl_platform.h>
+#include <stdio.h>
+
+void warn(const char *fmt, ...);
+void die(const char *fmt, ...);
+
+void efwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream);
+
+const char *cl_strerror(cl_int err);