latest SDK

foobar2000/SDK/genrand.h

@@ -0,0 +1,42 @@
+//! PRNG service. Implemented by the core, do not reimplement.  Use g_create() helper function to instantiate.
+class NOVTABLE genrand_service : public service_base
+{
+public:
+	//! Seeds the PRNG with specified value.
+	virtual void seed(unsigned val) = 0;
+	//! Returns random value N, where 0 <= N < range.
+	virtual unsigned genrand(unsigned range)=0;
+
+	double genrand_f() { return (double)genrand(0xFFFFFFFF) / (double)0xFFFFFFFF; }
+
+	void genrand_blob( void * out, size_t bytes ) {
+		size_t dwords = bytes/4;
+		uint32_t * out32 = (uint32_t*) out;
+		for(size_t w = 0; w < dwords; ++w ) {
+			out32[w] = genrand32();
+		}
+		size_t left = bytes % 4;
+		if (left > 0) {
+			auto leftptr = (uint8_t*) out + (bytes-left);
+			for( size_t w = 0; w < left; ++w) leftptr[w] = genrand8();
+		}
+	}
+
+	uint32_t genrand32() {
+		return (uint32_t) genrand(0xFFFFFFFF);
+	}
+	uint8_t genrand8() {
+		return (uint8_t) genrand(0x100);
+	}
+
+	static service_ptr_t<genrand_service> g_create() {return standard_api_create_t<genrand_service>();}
+
+	void generate_random_order(t_size * out, t_size count) {
+        unsigned genrandMax = (unsigned) pfc::min_t<size_t>(count, 0xFFFFFFFF);
+		t_size n;
+		for(n=0;n<count;n++) out[n]=n;
+		for(n=0;n<count;n++) pfc::swap_t(out[n],out[genrand(genrandMax)]);
+	}
+
+	FB2K_MAKE_SERVICE_COREAPI(genrand_service);
+};