1 files changed, 72 insertions, 0 deletions
diff --git a/balls.c b/balls.c
new file mode 100644
index 0000000..af4f9d5
--- /dev/null
+++ b/balls.c
@@ -0,0 +1,72 @@
+#define CL_TARGET_OPENCL_VERSION 110
+
+#include <stdio.h>
+#include <GL/glut.h>
+#include <GL/glx.h>
+#include <CL/cl_gl.h>
+
+#include "sysfatal.h"
+
+#define PROG "balls.cl"
+#define KERNEL "balls"
+
+enum { WIDTH = 640, HEIGHT = 480 };
+
+void initGL(int argc, char *argv[]);
+cl_context initCL(void);
+
+int
+main(int argc, char *argv[]) {
+	cl_context context;
+
+	initGL(argc, argv);
+
+	context = initCL();
+
+	clReleaseContext(context);
+}
+
+void
+initGL(int argc, char *argv[]) {
+	glutInit(&argc, argv);
+	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA);
+	glutInitWindowSize(WIDTH, HEIGHT);
+	glutCreateWindow("Balls");
+	glClearColor(1, 1, 1, 1);
+}
+
+cl_context
+initCL(void) {
+	cl_platform_id platform;
+	cl_device_id device;
+	cl_context context;
+	cl_int err;
+
+	if (clGetPlatformIDs(1, &platform, NULL) < 0)
+		sysfatal("No OpenCL platform available.\n");
+
+	#ifdef WINDOWS
+		cl_context_properties properties[] = {
+			CL_GL_CONTEXT_KHR, (cl_context_properties) wglGetCurrentContext(),
+			CL_GLX_DISPLAY_KHR, (cl_context_properties) wctlGetCurrentDC(),
+			CL_CONTEXT_PLATFORM, (cl_context_properties) platform,
+			0
+		};
+	#else
+		cl_context_properties properties[] = {
+			CL_GL_CONTEXT_KHR, (cl_context_properties) glXGetCurrentContext(),
+			CL_GLX_DISPLAY_KHR, (cl_context_properties) glXGetCurrentDisplay(),
+			CL_CONTEXT_PLATFORM, (cl_context_properties) platform,
+			0
+		};
+	#endif
+
+	if (clGetDeviceIDs(platform, CL_DEVICE_TYPE_GPU, 1, &device, NULL) < 0)
+		sysfatal("No GPUs available.\n");
+
+	context = clCreateContext(properties, 1, &device, NULL, NULL, &err);
+	if (err < 0)
+		sysfatal("Failed to create context.\n");
+
+	return context;
+}