ReplaceTables: Fix Amagoushi no Yakata 3D investigation hit-test readback

- Fixes #22514

The 3D investigation mode renders an ID picking pass into VRAM and reads
it back on the CPU to build the hit-test table. Hook the decode function
to flush the framebuffers to VRAM first, and force lower resolution for
effects to avoid stutter.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

Core/HLE/ReplaceTables.cpp

@@ -985,6 +985,15 @@ static int Hook_soranokiseki_sc_download_frame() {
 	return 0;
 }
 
+static int Hook_amagoushi_download_frame() {
+	// Amagoushi no Yakata (ULJS00216) offscreen picking pass renders to 0x04000000 or 0x04080000.
+	// Flush GPU framebuffer to VRAM before CPU decodes pixels into hit-test table.
+	gpu->PerformReadbackToMemory(0x04000000, 0x00044000);
+	gpu->PerformReadbackToMemory(0x04080000, 0x00044000);
+	NotifyMemInfo(MemBlockFlags::WRITE, 0x04000000, 0x00044000, "amagoushi_download_frame");
+	return 0;
+}
+
 static int Hook_bokunonatsuyasumi4_download_frame() {
 	const u32 fb_address = currentMIPS->r[MIPS_REG_A3];
 	if (Memory::IsVRAMAddress(fb_address)) {
@@ -1917,6 +1926,7 @@ static const ReplacementTableEntry entries[] = {
 	{ "kagaku_no_ensemble_download_frame", &Hook_kagaku_no_ensemble_download_frame, 0, REPFLAG_HOOKENTER, 0x38 },
 	{ "soranokiseki_fc_download_frame", &Hook_soranokiseki_fc_download_frame, 0, REPFLAG_HOOKENTER, 0x180 },
 	{ "soranokiseki_sc_download_frame", &Hook_soranokiseki_sc_download_frame, 0, REPFLAG_HOOKENTER, },
+	{ "amagoushi_download_frame", &Hook_amagoushi_download_frame, 0, REPFLAG_HOOKENTER },
 	{ "bokunonatsuyasumi4_download_frame", &Hook_bokunonatsuyasumi4_download_frame, 0, REPFLAG_HOOKENTER, 0x8C },
 	{ "danganronpa2_1_download_frame", &Hook_danganronpa2_1_download_frame, 0, REPFLAG_HOOKENTER, 0x68 },
 	{ "danganronpa2_2_download_frame", &Hook_danganronpa2_2_download_frame, 0, REPFLAG_HOOKENTER, 0x94 },

Core/MIPS/MIPSAnalyst.cpp

@@ -125,6 +125,7 @@ static const HardHashTableEntry hardcodedHashes[] = {
 	{ 0x11624abe9542fb01, 180, "everybodysgolf_copy_portrait", }, // Everybody's Golf (EUR)
 	{ 0x1252e902d0b49bfb, 44, "vector_sub_q_2", },
 	{ 0x12df3d33a58d0298, 52, "sceVfpuMatrix3Unit", },
+	{ 0x12eed64025f5052bULL, 268, "amagoushi_download_frame", }, // Amagoushi no Yakata (ULJS00216)
 	{ 0x12feef7b017d3431, 700, "memmove", },
 	{ 0x1322c7e3fe6dff4d, 784, "_free_r", },
 	{ 0x1376c115d5f1d90c, 36, "strlen", },

assets/compat.ini

@@ -1472,6 +1472,11 @@ ULUS10435 = true
 ULES01277 = true
 
 [ForceLowerResolutionForEffectsOn]
+# Amagoushi no Yakata series - offscreen solid color ID picking pass (issue #22514)
+ULJS00216 = true
+ULJS00230 = true
+NPJH50186 = true
+
 # The water effect of DiRT 2 and Outrun doesn't work in higher resolutions.
 
 # Colin McRae's DiRT 2 - issue #13012 (water)