adding device selection, buffer creation and pipeline creation to Metal backend

Sources/Backends/Metal/MetalComputePass.m

@@ -0,0 +1,49 @@
+// Copyright (C) 2025 kanel
+// This file is part of "Pulse"
+// For conditions of distribution and use, see copyright notice in LICENSE
+
+#include <Pulse.h>
+#include "../../PulseInternal.h"
+#include "Metal.h"
+#include "MetalComputePass.h"
+#include "MetalCommandList.h"
+
+PulseComputePass MetalCreateComputePass(PulseDevice device, PulseCommandList cmd)
+{
+	PULSE_UNUSED(device);
+	PulseComputePass pass = (PulseComputePass)calloc(1, sizeof(PulseComputePassHandler));
+	PULSE_CHECK_ALLOCATION_RETVAL(pass, PULSE_NULL_HANDLE);
+	return pass;
+}
+
+void MetalDestroyComputePass(PulseDevice device, PulseComputePass pass)
+{
+}
+
+PulseComputePass MetalBeginComputePass(PulseCommandList cmd)
+{
+}
+
+void MetalEndComputePass(PulseComputePass pass)
+{
+}
+
+void MetalBindStorageBuffers(PulseComputePass pass, const PulseBuffer* buffers, uint32_t num_buffers)
+{
+}
+
+void MetalBindUniformData(PulseComputePass pass, uint32_t slot, const void* data, uint32_t data_size)
+{
+}
+
+void MetalBindStorageImages(PulseComputePass pass, const PulseImage* images, uint32_t num_images)
+{
+}
+
+void MetalBindComputePipeline(PulseComputePass pass, PulseComputePipeline pipeline)
+{
+}
+
+void MetalDispatchComputations(PulseComputePass pass, uint32_t groupcount_x, uint32_t groupcount_y, uint32_t groupcount_z)
+{
+}