adding software computer base

Sources/Backends/Software/Soft.c

@@ -0,0 +1,42 @@
+// 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 "Soft.h"
+#include "SoftDevice.h"
+
+PulseBackendFlags SoftCheckSupport(PulseBackendFlags candidates, PulseShaderFormatsFlags shader_formats_used)
+{
+	if(candidates != PULSE_BACKEND_ANY && (candidates & PULSE_BACKEND_SOFTWARE) == 0)
+		return PULSE_BACKEND_INVALID;
+	if((shader_formats_used & PULSE_SHADER_FORMAT_SPIRV_BIT) == 0)
+		return PULSE_BACKEND_INVALID;
+	return PULSE_BACKEND_SOFTWARE; // Software computer is always supported
+}
+
+bool SoftLoadBackend(PulseBackend backend, PulseDebugLevel debug_level)
+{
+	PULSE_UNUSED(backend);
+	PULSE_UNUSED(debug_level);
+	SoftDriverData* driver_data = (SoftDriverData*)calloc(1, sizeof(SoftDriverData));
+	PULSE_CHECK_ALLOCATION_RETVAL(driver_data, false);
+	WebGPUDriver.driver_data = driver_data;
+	return true;
+}
+
+void SoftUnloadBackend(PulseBackend backend)
+{
+	free(backend->driver_data);
+}
+
+PulseBackendHandler SoftwareDriver = {
+	.PFN_LoadBackend = SoftLoadBackend,
+	.PFN_UnloadBackend = SoftUnloadBackend,
+	.PFN_CreateDevice = SoftCreateDevice,
+	.backend = PULSE_BACKEND_SOFTWARE,
+	.supported_shader_formats = PULSE_SHADER_FORMAT_SPIRV_BIT,
+	.driver_data = PULSE_NULLPTR
+};