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

Examples/Metal/main.c

@@ -0,0 +1,63 @@
+#include <Pulse.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+void DebugCallBack(PulseDebugMessageSeverity severity, const char* message)
+{
+	if(severity == PULSE_DEBUG_MESSAGE_SEVERITY_ERROR)
+	{
+		fprintf(stderr, "Pulse Error: %s\n", message);
+		exit(1);
+	}
+	else if(severity == PULSE_DEBUG_MESSAGE_SEVERITY_WARNING)
+		fprintf(stderr, "Pulse Warning: %s\n", message);
+	else
+		printf("Pulse: %s\n", message);
+}
+
+#define BUFFER_SIZE (256 * sizeof(uint32_t))
+
+const char* msl_source = 
+"#include <metal_stdlib>\n \
+using namespace metal;\
+\
+kernel void Main(device int* ssbo [[ buffer(0) ]], uint3 grid [[ thread_position_in_grid ]]) \
+{ \
+	uint idx = grid.x * grid.y; \
+	ssbo[idx] = static_cast<int>(idx); \
+}";
+
+int main(void)
+{
+	PulseBackend backend = PulseLoadBackend(PULSE_BACKEND_METAL, PULSE_SHADER_FORMAT_MSL_BIT, PULSE_HIGH_DEBUG);
+	PulseSetDebugCallback(backend, DebugCallBack);
+	PulseDevice device = PulseCreateDevice(backend, NULL, 0);
+
+	PulseBufferCreateInfo buffer_create_info = { 0 };
+	buffer_create_info.size = BUFFER_SIZE;
+	buffer_create_info.usage = PULSE_BUFFER_USAGE_STORAGE_READ | PULSE_BUFFER_USAGE_STORAGE_WRITE | PULSE_BUFFER_USAGE_TRANSFER_DOWNLOAD;
+	PulseBuffer buffer = PulseCreateBuffer(device, &buffer_create_info);
+
+	// GPU computations
+	{
+		PulseComputePipelineCreateInfo info = { 0 };
+		info.code_size = strlen(msl_source);
+		info.code = (const uint8_t*)msl_source;
+		info.entrypoint = "Main";
+		info.format = PULSE_SHADER_FORMAT_MSL_BIT;
+		info.num_readwrite_storage_buffers = 1;
+		PulseComputePipeline pipeline = PulseCreateComputePipeline(device, &info);
+
+		PulseDestroyComputePipeline(device, pipeline);
+	}
+
+	PulseDestroyBuffer(device, buffer);
+
+	PulseDestroyDevice(device);
+	PulseUnloadBackend(backend);
+	puts("Successfully executed Pulse example using Metal !");
+	return 0;
+}
+

Examples/Metal/xmake.lua

@@ -0,0 +1,4 @@
+target("MetalExample")
+	add_deps("pulse_gpu")
+	add_files("*.c")
+target_end()