Reorganized loose files in src into src/recomp folder

src/recomp/dp.cpp

@@ -0,0 +1,44 @@
+#include "recomp.h"
+
+enum class RDPStatusBit {
+	XbusDmem = 0,
+	Freeze = 1,
+	Flush = 2,
+	CommandBusy = 6,
+	BufferReady = 7,
+	DmaBusy = 8,
+	EndValid = 9,
+	StartValid = 10,
+};
+
+constexpr void update_bit(uint32_t& state, uint32_t flags, RDPStatusBit bit) {
+	int set_bit_pos = (int)bit * 2 + 0;
+	int reset_bit_pos = (int)bit * 2 + 1;
+	bool set = (flags & (1U << set_bit_pos)) != 0;
+	bool reset = (flags & (1U << reset_bit_pos)) != 0;
+
+	if (set ^ reset) {
+		if (set) {
+			state |= (1U << (int)bit);
+		}
+		else {
+			state &= ~(1U << (int)bit);
+		}
+	}
+}
+
+uint32_t rdp_state = 1 << (int)RDPStatusBit::BufferReady;
+
+extern "C" void osDpSetNextBuffer_recomp(uint8_t* rdram, recomp_context* ctx) {
+    assert(false);
+}
+
+extern "C" void osDpGetStatus_recomp(uint8_t* rdram, recomp_context* ctx) {
+	ctx->r2 = rdp_state;
+}
+
+extern "C" void osDpSetStatus_recomp(uint8_t* rdram, recomp_context* ctx) {
+	update_bit(rdp_state, ctx->r4, RDPStatusBit::XbusDmem);
+	update_bit(rdp_state, ctx->r4, RDPStatusBit::Freeze);
+	update_bit(rdp_state, ctx->r4, RDPStatusBit::Flush);
+}