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yaze/test/integration/emulator_object_preview_test.cc

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// Integration tests for DungeonObjectEmulatorPreview
// Tests the SNES emulator-based object rendering pipeline
#ifndef IMGUI_DEFINE_MATH_OPERATORS
#define IMGUI_DEFINE_MATH_OPERATORS
#endif
#include <gtest/gtest.h>
#include <array>
#include <cstdint>
#include <memory>
#include <vector>
#include "app/emu/render/save_state_manager.h"
#include "app/emu/snes.h"
#include "rom/rom.h"
#include "test_utils.h"
#include "zelda3/dungeon/room.h"
#include "zelda3/dungeon/room_object.h"
namespace yaze {
namespace test {
namespace {
// Convert 8BPP linear tile data to 4BPP SNES planar format
// This is a copy of the function in dungeon_object_emulator_preview.cc for testing
std::vector<uint8_t> ConvertLinear8bppToPlanar4bpp(
const std::vector<uint8_t>& linear_data) {
size_t num_tiles = linear_data.size() / 64; // 64 bytes per 8x8 tile
std::vector<uint8_t> planar_data(num_tiles * 32); // 32 bytes per tile
for (size_t tile = 0; tile < num_tiles; ++tile) {
const uint8_t* src = linear_data.data() + tile * 64;
uint8_t* dst = planar_data.data() + tile * 32;
for (int row = 0; row < 8; ++row) {
uint8_t bp0 = 0, bp1 = 0, bp2 = 0, bp3 = 0;
for (int col = 0; col < 8; ++col) {
uint8_t pixel = src[row * 8 + col] & 0x0F; // Low 4 bits only
int bit = 7 - col; // MSB first
bp0 |= ((pixel >> 0) & 1) << bit;
bp1 |= ((pixel >> 1) & 1) << bit;
bp2 |= ((pixel >> 2) & 1) << bit;
bp3 |= ((pixel >> 3) & 1) << bit;
}
// SNES 4BPP interleaving: bp0,bp1 for rows 0-7 first, then bp2,bp3
dst[row * 2] = bp0;
dst[row * 2 + 1] = bp1;
dst[16 + row * 2] = bp2;
dst[16 + row * 2 + 1] = bp3;
}
}
return planar_data;
}
} // namespace
// =============================================================================
// Unit Tests for 8BPP to 4BPP Conversion
// =============================================================================
class BppConversionTest : public ::testing::Test {
protected:
// Create a simple test tile with known pixel values
std::vector<uint8_t> CreateTestTile(uint8_t fill_value) {
std::vector<uint8_t> tile(64, fill_value);
return tile;
}
// Create a gradient tile for testing bit extraction
std::vector<uint8_t> CreateGradientTile() {
std::vector<uint8_t> tile(64);
for (int i = 0; i < 64; ++i) {
tile[i] = i % 16; // Values 0-15 repeating
}
return tile;
}
};
TEST_F(BppConversionTest, EmptyInputProducesEmptyOutput) {
std::vector<uint8_t> empty;
auto result = ConvertLinear8bppToPlanar4bpp(empty);
EXPECT_TRUE(result.empty());
}
TEST_F(BppConversionTest, SingleTileProducesCorrectSize) {
auto tile = CreateTestTile(0);
auto result = ConvertLinear8bppToPlanar4bpp(tile);
// 64 bytes input (8BPP) -> 32 bytes output (4BPP)
EXPECT_EQ(result.size(), 32u);
}
TEST_F(BppConversionTest, MultipleTilesProduceCorrectSize) {
// Create 4 tiles (256 bytes)
std::vector<uint8_t> tiles(256, 0);
auto result = ConvertLinear8bppToPlanar4bpp(tiles);
// 256 bytes input -> 128 bytes output
EXPECT_EQ(result.size(), 128u);
}
TEST_F(BppConversionTest, AllZerosProducesAllZeros) {
auto tile = CreateTestTile(0);
auto result = ConvertLinear8bppToPlanar4bpp(tile);
for (uint8_t byte : result) {
EXPECT_EQ(byte, 0u);
}
}
TEST_F(BppConversionTest, AllOnesProducesCorrectPattern) {
// Pixel value 1 = bit 0 set
auto tile = CreateTestTile(1);
auto result = ConvertLinear8bppToPlanar4bpp(tile);
// With all pixels = 1, bitplane 0 should be all 0xFF
// Bitplanes 1, 2, 3 should be all 0x00
for (int row = 0; row < 8; ++row) {
EXPECT_EQ(result[row * 2], 0xFF) << "Row " << row << " bp0";
EXPECT_EQ(result[row * 2 + 1], 0x00) << "Row " << row << " bp1";
EXPECT_EQ(result[16 + row * 2], 0x00) << "Row " << row << " bp2";
EXPECT_EQ(result[16 + row * 2 + 1], 0x00) << "Row " << row << " bp3";
}
}
TEST_F(BppConversionTest, Value15ProducesAllBitsSet) {
// Pixel value 15 (0xF) = all 4 bits set
auto tile = CreateTestTile(15);
auto result = ConvertLinear8bppToPlanar4bpp(tile);
// All bitplanes should be 0xFF
for (int row = 0; row < 8; ++row) {
EXPECT_EQ(result[row * 2], 0xFF) << "Row " << row << " bp0";
EXPECT_EQ(result[row * 2 + 1], 0xFF) << "Row " << row << " bp1";
EXPECT_EQ(result[16 + row * 2], 0xFF) << "Row " << row << " bp2";
EXPECT_EQ(result[16 + row * 2 + 1], 0xFF) << "Row " << row << " bp3";
}
}
TEST_F(BppConversionTest, HighBitsAreIgnored) {
// Pixel value 0xFF should be treated as 0x0F (low 4 bits only)
auto tile_ff = CreateTestTile(0xFF);
auto tile_0f = CreateTestTile(0x0F);
auto result_ff = ConvertLinear8bppToPlanar4bpp(tile_ff);
auto result_0f = ConvertLinear8bppToPlanar4bpp(tile_0f);
EXPECT_EQ(result_ff, result_0f);
}
TEST_F(BppConversionTest, SinglePixelBitplaneExtraction) {
// Create a tile with just the first pixel set to value 5 (0101 binary)
std::vector<uint8_t> tile(64, 0);
tile[0] = 5; // First pixel = 0101
auto result = ConvertLinear8bppToPlanar4bpp(tile);
// First pixel is at MSB position (bit 7) of first row
// Value 5 = 0101 = bp0=1, bp1=0, bp2=1, bp3=0
EXPECT_EQ(result[0] & 0x80, 0x80) << "bp0 bit 7 should be set";
EXPECT_EQ(result[1] & 0x80, 0x00) << "bp1 bit 7 should be clear";
EXPECT_EQ(result[16] & 0x80, 0x80) << "bp2 bit 7 should be set";
EXPECT_EQ(result[17] & 0x80, 0x00) << "bp3 bit 7 should be clear";
}
TEST_F(BppConversionTest, GradientTileConversion) {
auto tile = CreateGradientTile();
auto result = ConvertLinear8bppToPlanar4bpp(tile);
// Verify size
EXPECT_EQ(result.size(), 32u);
// The gradient should produce non-trivial bitplane data
bool has_nonzero_bp0 = false;
bool has_nonzero_bp1 = false;
bool has_nonzero_bp2 = false;
bool has_nonzero_bp3 = false;
for (int row = 0; row < 8; ++row) {
if (result[row * 2] != 0) has_nonzero_bp0 = true;
if (result[row * 2 + 1] != 0) has_nonzero_bp1 = true;
if (result[16 + row * 2] != 0) has_nonzero_bp2 = true;
if (result[16 + row * 2 + 1] != 0) has_nonzero_bp3 = true;
}
EXPECT_TRUE(has_nonzero_bp0) << "Gradient should have non-zero bp0";
EXPECT_TRUE(has_nonzero_bp1) << "Gradient should have non-zero bp1";
EXPECT_TRUE(has_nonzero_bp2) << "Gradient should have non-zero bp2";
EXPECT_TRUE(has_nonzero_bp3) << "Gradient should have non-zero bp3";
}
// =============================================================================
// Integration Tests with SNES Emulator (requires ROM)
// =============================================================================
class EmulatorObjectPreviewTest : public TestRomManager::BoundRomTest {
protected:
void SetUp() override {
BoundRomTest::SetUp();
// Initialize SNES emulator with ROM
snes_ = std::make_unique<emu::Snes>();
snes_->Init(rom()->vector());
}
void TearDown() override {
snes_.reset();
BoundRomTest::TearDown();
}
// Setup CPU state for object handler execution
void SetupCpuForHandler(uint16_t handler_offset) {
auto& cpu = snes_->cpu();
// Reset and configure
snes_->Reset(true);
cpu.PB = 0x01; // Program bank
cpu.DB = 0x7E; // Data bank (WRAM)
cpu.D = 0x0000; // Direct page
cpu.SetSP(0x01FF); // Stack pointer
cpu.status = 0x30; // 8-bit A/X/Y mode
// Set PC to handler
cpu.PC = handler_offset;
}
// Lookup object handler from ROM
uint16_t LookupObjectHandler(int object_id) {
auto rom_data = rom()->data();
uint32_t table_addr = 0;
if (object_id < 0x100) {
table_addr = 0x018200 + (object_id * 2);
} else if (object_id < 0x200) {
table_addr = 0x018470 + ((object_id - 0x100) * 2);
} else {
table_addr = 0x0185F0 + ((object_id - 0x200) * 2);
}
if (table_addr < rom()->size() - 1) {
return rom_data[table_addr] | (rom_data[table_addr + 1] << 8);
}
return 0;
}
std::unique_ptr<emu::Snes> snes_;
};
TEST_F(EmulatorObjectPreviewTest, SnesInitializesCorrectly) {
ASSERT_NE(snes_, nullptr);
// Verify CPU is accessible
auto& cpu = snes_->cpu();
EXPECT_EQ(cpu.PB, 0x00); // After init, PB should be 0
}
TEST_F(EmulatorObjectPreviewTest, ObjectHandlerTableLookup) {
// Test that handler table addresses are valid
// Object 0x00 should have a handler
uint16_t handler_0 = LookupObjectHandler(0x00);
EXPECT_NE(handler_0, 0x0000) << "Object 0x00 should have a handler";
// Object 0x100 (Type 2)
uint16_t handler_100 = LookupObjectHandler(0x100);
// May or may not have handler, just verify lookup doesn't crash
// Object 0x200 (Type 3)
uint16_t handler_200 = LookupObjectHandler(0x200);
// May or may not have handler
printf("[TEST] Handler 0x00 = $%04X\n", handler_0);
printf("[TEST] Handler 0x100 = $%04X\n", handler_100);
printf("[TEST] Handler 0x200 = $%04X\n", handler_200);
}
// DISABLED: CPU execution from manually-set PC doesn't work as expected.
// After Init(), the emulator's internal state causes RunOpcode() to
// jump to the reset vector ($8000) instead of executing from the set PC.
// This documents a limitation in using the emulator for isolated code execution.
TEST_F(EmulatorObjectPreviewTest, DISABLED_CpuCanExecuteInstructions) {
auto& cpu = snes_->cpu();
// Write a NOP (EA) instruction to WRAM at a known location
snes_->Write(0x7E1000, 0xEA); // NOP
snes_->Write(0x7E1001, 0xEA); // NOP
snes_->Write(0x7E1002, 0xEA); // NOP
// Verify the writes worked
EXPECT_EQ(snes_->Read(0x7E1000), 0xEA) << "WRAM write should persist";
// Setup CPU to execute from WRAM
cpu.PB = 0x7E;
cpu.PC = 0x1000;
cpu.DB = 0x7E;
cpu.SetSP(0x01FF);
cpu.status = 0x30;
uint16_t initial_pc = cpu.PC;
// Execute one NOP instruction
cpu.RunOpcode();
// NOP is a 1-byte instruction, so PC should advance by 1
EXPECT_EQ(cpu.PC, initial_pc + 1)
<< "PC should advance by 1 after NOP (was " << initial_pc
<< ", now " << cpu.PC << ")";
}
TEST_F(EmulatorObjectPreviewTest, WramReadWrite) {
// Test WRAM access
const uint32_t test_addr = 0x7E2000;
// Write test pattern
snes_->Write(test_addr, 0xAB);
snes_->Write(test_addr + 1, 0xCD);
// Read back
uint8_t lo = snes_->Read(test_addr);
uint8_t hi = snes_->Read(test_addr + 1);
EXPECT_EQ(lo, 0xAB);
EXPECT_EQ(hi, 0xCD);
uint16_t word = lo | (hi << 8);
EXPECT_EQ(word, 0xCDAB);
}
TEST_F(EmulatorObjectPreviewTest, VramCanBeWritten) {
auto& ppu = snes_->ppu();
// Write test data to VRAM
ppu.vram[0] = 0x1234;
ppu.vram[1] = 0x5678;
EXPECT_EQ(ppu.vram[0], 0x1234);
EXPECT_EQ(ppu.vram[1], 0x5678);
}
TEST_F(EmulatorObjectPreviewTest, CgramCanBeWritten) {
auto& ppu = snes_->ppu();
// Write test palette data to CGRAM
ppu.cgram[0] = 0x0000; // Black
ppu.cgram[1] = 0x7FFF; // White
ppu.cgram[2] = 0x001F; // Red
EXPECT_EQ(ppu.cgram[0], 0x0000);
EXPECT_EQ(ppu.cgram[1], 0x7FFF);
EXPECT_EQ(ppu.cgram[2], 0x001F);
}
TEST_F(EmulatorObjectPreviewTest, RoomGraphicsCanBeLoaded) {
// Load room 0
zelda3::Room room = zelda3::LoadRoomFromRom(rom(), 0);
// Load graphics
room.LoadRoomGraphics(room.blockset);
room.CopyRoomGraphicsToBuffer();
const auto& gfx_buffer = room.get_gfx_buffer();
// Verify buffer is populated
EXPECT_EQ(gfx_buffer.size(), 65536u) << "Graphics buffer should be 64KB";
// Count non-zero bytes
int nonzero_count = 0;
for (uint8_t byte : gfx_buffer) {
if (byte != 0) nonzero_count++;
}
EXPECT_GT(nonzero_count, 0) << "Graphics buffer should have non-zero data";
printf("[TEST] Graphics buffer: %d non-zero bytes out of 65536\n", nonzero_count);
}
TEST_F(EmulatorObjectPreviewTest, GraphicsConversionProducesValidData) {
// Load room graphics
zelda3::Room room = zelda3::LoadRoomFromRom(rom(), 0);
room.LoadRoomGraphics(room.blockset);
room.CopyRoomGraphicsToBuffer();
const auto& gfx_buffer = room.get_gfx_buffer();
// Convert to 4BPP planar
std::vector<uint8_t> linear_data(gfx_buffer.begin(), gfx_buffer.end());
auto planar_data = ConvertLinear8bppToPlanar4bpp(linear_data);
// Verify conversion
EXPECT_EQ(planar_data.size(), 32768u) << "4BPP should be half the size of 8BPP";
// Count non-zero bytes in converted data
int nonzero_count = 0;
for (uint8_t byte : planar_data) {
if (byte != 0) nonzero_count++;
}
EXPECT_GT(nonzero_count, 0) << "Converted data should have non-zero bytes";
printf("[TEST] Planar data: %d non-zero bytes out of 32768\n", nonzero_count);
}
// Test documenting current limitation - handlers require full game state
// Test documenting current limitation - handlers require full game state
// Enabled now that we can inject save states!
TEST_F(EmulatorObjectPreviewTest, HandlerExecutionRequiresGameState) {
// Initialize SaveStateManager
auto state_manager = std::make_unique<emu::render::SaveStateManager>(snes_.get(), rom());
state_manager->SetStateDirectory("/tmp/yaze_test_states");
// Load the Sanctuary state (room 0x0012) which we generated in SaveStateGenerationTest
// This provides the necessary game state (tables, pointers, etc.)
printf("[TEST] Loading state for room 0x0012...\n");
auto status = state_manager->LoadState(emu::render::StateType::kRoomLoaded, 0x0012);
if (!status.ok()) {
printf("[TEST] Failed to load state: %s. Skipping test.\n", status.message().data());
return;
}
printf("[TEST] State loaded successfully.\n");
uint16_t handler = LookupObjectHandler(0x00);
ASSERT_NE(handler, 0x0000) << "Object 0x00 should have a handler";
printf("[TEST] Handler address: $%04X\n", handler);
// We don't need full SetupCpuForHandler because LoadState sets up the CPU
// But we do need to set PC to the handler and setup the stack for return
auto& cpu = snes_->cpu();
// Keep the loaded state but override PC to our handler
cpu.PC = handler;
// Setup return address at $01:8000 (RTL)
// Note: We must be careful not to corrupt the stack from the save state
// But for this test, we just want to see if it runs without crashing and writes to WRAM
// Write RTL at return address
printf("[TEST] Writing RTL to $01:8000...\n");
snes_->Write(0x018000, 0x6B);
// Push return address (0x018000)
printf("[TEST] Pushing return address to SP=$%04X...\n", cpu.SP());
uint16_t sp = cpu.SP();
// Stack is always in Bank 0 ($00:01xx)
snes_->Write(0x000000 | sp--, 0x01); // Bank
snes_->Write(0x000000 | sp--, 0x80); // High
snes_->Write(0x000000 | sp--, 0x00); // Low
cpu.SetSP(sp);
// Setup X/Y for the handler (data offset and tilemap pos)
// Object 0x00 is usually simple, but let's give it valid params
cpu.X = 0x0000; // Data offset (dummy)
cpu.Y = 0x0000; // Tilemap position (top-left)
printf("[TEST] Starting execution at $%02X:%04X...\n", cpu.PB, cpu.PC);
// Execute some opcodes
int opcodes = 0;
int max_opcodes = 5000; // Increased for safety
while (opcodes < max_opcodes) {
if (cpu.PB == 0x01 && cpu.PC == 0x8000) {
printf("[TEST] Handler returned successfully at opcode %d\n", opcodes);
break;
}
// Trace execution
uint32_t addr = (cpu.PB << 16) | cpu.PC;
uint8_t opcode = snes_->Read(addr);
printf("[%4d] $%02X:%04X: %02X (A=$%04X X=$%04X Y=$%04X SP=$%04X)\n",
opcodes, cpu.PB, cpu.PC, opcode, cpu.A, cpu.X, cpu.Y, cpu.SP());
cpu.RunOpcode();
opcodes++;
}
printf("[TEST] Executed %d opcodes, final PC=$%02X:%04X\n",
opcodes, cpu.PB, cpu.PC);
// Check if anything was written to WRAM tilemap
// The handler for object 0x00 should write something
bool has_tilemap_data = false;
for (uint32_t i = 0; i < 0x100; i++) {
if (snes_->Read(0x7E2000 + i) != 0) {
has_tilemap_data = true;
break;
}
}
EXPECT_TRUE(has_tilemap_data)
<< "Handler should write to tilemap (now passing with save state!)";
}
// =============================================================================
// Emulator State Injection Tests
// Tests for proper SNES state setup for isolated code execution
// =============================================================================
class EmulatorStateInjectionTest : public TestRomManager::BoundRomTest {
protected:
void SetUp() override {
BoundRomTest::SetUp();
snes_ = std::make_unique<emu::Snes>();
snes_->Init(rom()->vector());
}
void TearDown() override {
snes_.reset();
BoundRomTest::TearDown();
}
// Convert SNES LoROM address to PC offset
static uint32_t SnesToPc(uint32_t snes_addr) {
uint8_t bank = (snes_addr >> 16) & 0xFF;
uint16_t addr = snes_addr & 0xFFFF;
if (addr >= 0x8000) {
return (bank & 0x7F) * 0x8000 + (addr - 0x8000);
}
return snes_addr;
}
std::unique_ptr<emu::Snes> snes_;
};
// Test LoROM address conversion
TEST_F(EmulatorStateInjectionTest, LoRomAddressConversion) {
// Bank $01 handler tables
EXPECT_EQ(SnesToPc(0x018000), 0x8000u) << "$01:8000 -> PC $8000";
EXPECT_EQ(SnesToPc(0x018200), 0x8200u) << "$01:8200 -> PC $8200";
EXPECT_EQ(SnesToPc(0x0186F8), 0x86F8u) << "$01:86F8 -> PC $86F8";
// Bank $00
EXPECT_EQ(SnesToPc(0x008000), 0x0000u) << "$00:8000 -> PC $0000";
EXPECT_EQ(SnesToPc(0x009B52), 0x1B52u) << "$00:9B52 -> PC $1B52";
// Bank $0D (palettes)
EXPECT_EQ(SnesToPc(0x0DD308), 0x6D308u) << "$0D:D308 -> PC $6D308";
EXPECT_EQ(SnesToPc(0x0DD734), 0x6D734u) << "$0D:D734 -> PC $6D734";
// Bank $02
EXPECT_EQ(SnesToPc(0x028000), 0x10000u) << "$02:8000 -> PC $10000";
}
// Test APU out_ports access
TEST_F(EmulatorStateInjectionTest, ApuOutPortsAccess) {
auto& apu = snes_->apu();
// Set mock values
apu.out_ports_[0] = 0xAA;
apu.out_ports_[1] = 0xBB;
apu.out_ports_[2] = 0xCC;
apu.out_ports_[3] = 0xDD;
// Verify values are set
EXPECT_EQ(apu.out_ports_[0], 0xAA);
EXPECT_EQ(apu.out_ports_[1], 0xBB);
EXPECT_EQ(apu.out_ports_[2], 0xCC);
EXPECT_EQ(apu.out_ports_[3], 0xDD);
}
// Test that APU out_ports values can be read via CPU
TEST_F(EmulatorStateInjectionTest, ApuOutPortsReadByCpu) {
auto& apu = snes_->apu();
// Set mock values
apu.out_ports_[0] = 0xAA;
apu.out_ports_[1] = 0xBB;
// Read via SNES Read() - this goes through the memory mapper
// NOTE: CatchUpApu() is called which may overwrite our values!
// This test documents the current behavior
uint8_t val0 = snes_->Read(0x002140);
uint8_t val1 = snes_->Read(0x002141);
printf("[TEST] APU read: $2140=$%02X (expected $AA), $2141=$%02X (expected $BB)\n",
val0, val1);
// These may NOT equal $AA/$BB due to CatchUpApu() running the APU
// Document current behavior rather than asserting
if (val0 != 0xAA || val1 != 0xBB) {
printf("[TEST] WARNING: CatchUpApu() may have overwritten mock values\n");
}
}
// Test handler table reading with correct LoROM conversion
TEST_F(EmulatorStateInjectionTest, HandlerTableReadWithLoRom) {
auto rom_data = rom()->data();
// Read object 0x00 handler from the correct PC offset
uint32_t handler_table_snes = 0x018200; // Type 1 handler table
uint32_t handler_table_pc = SnesToPc(handler_table_snes);
EXPECT_EQ(handler_table_pc, 0x8200u);
if (handler_table_pc + 1 < rom()->size()) {
uint16_t handler = rom_data[handler_table_pc] |
(rom_data[handler_table_pc + 1] << 8);
printf("[TEST] Object 0x00 handler (from PC $%04X): $%04X\n",
handler_table_pc, handler);
// Handler should be in the $8xxx-$9xxx range (bank $01 code)
EXPECT_GE(handler, 0x8000u) << "Handler should be >= $8000";
EXPECT_LT(handler, 0x10000u) << "Handler should be < $10000";
} else {
FAIL() << "Handler table address out of ROM bounds";
}
}
// Test data offset table reading
TEST_F(EmulatorStateInjectionTest, DataOffsetTableReadWithLoRom) {
auto rom_data = rom()->data();
// Read object 0x00 data offset
uint32_t data_table_snes = 0x018000; // Type 1 data table
uint32_t data_table_pc = SnesToPc(data_table_snes);
EXPECT_EQ(data_table_pc, 0x8000u);
if (data_table_pc + 1 < rom()->size()) {
uint16_t data_offset = rom_data[data_table_pc] |
(rom_data[data_table_pc + 1] << 8);
printf("[TEST] Object 0x00 data offset (from PC $%04X): $%04X\n",
data_table_pc, data_offset);
// Data offset is into RoomDrawObjectData, should be reasonable
EXPECT_LT(data_offset, 0x8000u) << "Data offset should be < $8000";
} else {
FAIL() << "Data table address out of ROM bounds";
}
}
// Test tilemap pointer setup
TEST_F(EmulatorStateInjectionTest, TilemapPointerSetup) {
// Setup tilemap pointers in zero page
constexpr uint32_t kBG1TilemapBase = 0x7E2000;
constexpr uint32_t kRowStride = 0x80;
constexpr uint8_t kPointerAddrs[] = {0xBF, 0xC2, 0xC5, 0xC8, 0xCB,
0xCE, 0xD1, 0xD4, 0xD7, 0xDA, 0xDD};
for (int i = 0; i < 11; ++i) {
uint32_t wram_addr = kBG1TilemapBase + (i * kRowStride);
uint8_t lo = wram_addr & 0xFF;
uint8_t mid = (wram_addr >> 8) & 0xFF;
uint8_t hi = (wram_addr >> 16) & 0xFF;
uint8_t zp_addr = kPointerAddrs[i];
snes_->Write(0x7E0000 | zp_addr, lo);
snes_->Write(0x7E0000 | (zp_addr + 1), mid);
snes_->Write(0x7E0000 | (zp_addr + 2), hi);
}
// Verify pointers were written correctly
for (int i = 0; i < 11; ++i) {
uint8_t zp_addr = kPointerAddrs[i];
uint8_t lo = snes_->Read(0x7E0000 | zp_addr);
uint8_t mid = snes_->Read(0x7E0000 | (zp_addr + 1));
uint8_t hi = snes_->Read(0x7E0000 | (zp_addr + 2));
uint32_t ptr = lo | (mid << 8) | (hi << 16);
uint32_t expected = kBG1TilemapBase + (i * kRowStride);
EXPECT_EQ(ptr, expected) << "Tilemap ptr $" << std::hex << (int)zp_addr
<< " should be $" << expected;
}
}
// Test sprite auxiliary palette loading
TEST_F(EmulatorStateInjectionTest, SpriteAuxPaletteLoading) {
auto rom_data = rom()->data();
// Sprite aux palettes at $0D:D308
uint32_t palette_snes = 0x0DD308;
uint32_t palette_pc = SnesToPc(palette_snes);
EXPECT_EQ(palette_pc, 0x6D308u);
if (palette_pc + 60 < rom()->size()) {
// Read first few palette colors
std::vector<uint16_t> colors;
for (int i = 0; i < 10; ++i) {
uint16_t color = rom_data[palette_pc + i * 2] |
(rom_data[palette_pc + i * 2 + 1] << 8);
colors.push_back(color);
}
printf("[TEST] First 10 sprite aux palette colors:\n");
for (int i = 0; i < 10; ++i) {
printf(" [%d] $%04X\n", i, colors[i]);
}
// At least some colors should be non-zero
int nonzero = 0;
for (uint16_t c : colors) {
if (c != 0) nonzero++;
}
EXPECT_GT(nonzero, 0) << "Sprite aux palette should have some non-zero colors";
} else {
printf("[TEST] WARNING: Sprite aux palette address $%X out of bounds\n", palette_pc);
}
}
// Test CPU state setup for handler execution
TEST_F(EmulatorStateInjectionTest, CpuStateSetup) {
snes_->Reset(true);
auto& cpu = snes_->cpu();
// Setup CPU state as we do in the preview
cpu.PB = 0x01;
cpu.DB = 0x7E;
cpu.D = 0x0000;
cpu.SetSP(0x01FF);
cpu.status = 0x30;
cpu.E = 0;
cpu.X = 0x03D8; // Sample data offset
cpu.Y = 0x0820; // Sample tilemap position
cpu.PC = 0x8B89; // Sample handler address
EXPECT_EQ(cpu.PB, 0x01);
EXPECT_EQ(cpu.DB, 0x7E);
EXPECT_EQ(cpu.D, 0x0000);
EXPECT_EQ(cpu.SP(), 0x01FF);
EXPECT_EQ(cpu.X, 0x03D8);
EXPECT_EQ(cpu.Y, 0x0820);
EXPECT_EQ(cpu.PC, 0x8B89);
}
// Test STP trap setup
// NOTE: Writing to bank $01 ROM space doesn't persist - ROM is read-only.
// This test verifies we can write STP to WRAM instead for trap detection.
TEST_F(EmulatorStateInjectionTest, StpTrapSetup) {
// $01:FF00 is ROM space - writes don't persist
// Instead, use a WRAM address for trap setup
const uint32_t wram_trap_addr = 0x7EFF00; // High WRAM
snes_->Write(wram_trap_addr, 0xDB); // STP opcode
// Verify write to WRAM succeeds
uint8_t opcode = snes_->Read(wram_trap_addr);
EXPECT_EQ(opcode, 0xDB) << "STP opcode should be written to WRAM trap address";
// Document the ROM write limitation
const uint32_t rom_trap_addr = 0x01FF00;
snes_->Write(rom_trap_addr, 0xDB);
uint8_t rom_opcode = snes_->Read(rom_trap_addr);
// This will NOT equal 0xDB because ROM is read-only
// The actual value depends on what's in the ROM at that address
EXPECT_NE(rom_opcode, 0xDB)
<< "ROM space writes should NOT persist (ROM is read-only)";
}
// =============================================================================
// Handler Execution Tracing Tests
// These tests help diagnose why handlers fail to execute properly
// =============================================================================
class HandlerExecutionTraceTest : public TestRomManager::BoundRomTest {
protected:
void SetUp() override {
BoundRomTest::SetUp();
snes_ = std::make_unique<emu::Snes>();
snes_->Init(rom()->vector());
}
void TearDown() override {
snes_.reset();
BoundRomTest::TearDown();
}
// Convert SNES LoROM address to PC offset
static uint32_t SnesToPc(uint32_t snes_addr) {
uint8_t bank = (snes_addr >> 16) & 0xFF;
uint16_t addr = snes_addr & 0xFFFF;
if (addr >= 0x8000) {
return (bank & 0x7F) * 0x8000 + (addr - 0x8000);
}
return snes_addr;
}
// Trace first N opcodes of execution
void TraceExecution(int num_opcodes) {
auto& cpu = snes_->cpu();
printf("\n[TRACE] Starting execution trace from $%02X:%04X\n", cpu.PB, cpu.PC);
printf(" X=$%04X Y=$%04X A=$%04X SP=$%04X\n",
cpu.X, cpu.Y, cpu.A, cpu.SP());
for (int i = 0; i < num_opcodes; ++i) {
uint32_t addr = (cpu.PB << 16) | cpu.PC;
uint8_t opcode = snes_->Read(addr);
printf("[%4d] $%02X:%04X: %02X", i, cpu.PB, cpu.PC, opcode);
// Execute
cpu.RunOpcode();
printf(" -> $%02X:%04X (A=$%04X X=$%04X Y=$%04X)\n",
cpu.PB, cpu.PC, cpu.A, cpu.X, cpu.Y);
// Check for STP
if (opcode == 0xDB) {
printf("[TRACE] STP encountered, stopping\n");
break;
}
// Check if we hit APU loop
if (cpu.PB == 0x00 && cpu.PC == 0x8891) {
printf("[TRACE] Hit APU loop at $00:8891\n");
break;
}
}
}
std::unique_ptr<emu::Snes> snes_;
};
// Trace first few instructions of object 0x00 handler
TEST_F(HandlerExecutionTraceTest, TraceObject00Handler) {
auto rom_data = rom()->data();
// Get handler address
uint32_t handler_table_pc = SnesToPc(0x018200);
uint16_t handler = rom_data[handler_table_pc] |
(rom_data[handler_table_pc + 1] << 8);
printf("[TEST] Object 0x00 handler: $%04X\n", handler);
// Get data offset
uint32_t data_table_pc = SnesToPc(0x018000);
uint16_t data_offset = rom_data[data_table_pc] |
(rom_data[data_table_pc + 1] << 8);
printf("[TEST] Object 0x00 data offset: $%04X\n", data_offset);
// Setup emulator state
snes_->Reset(true);
auto& cpu = snes_->cpu();
auto& apu = snes_->apu();
// Setup APU mock
apu.out_ports_[0] = 0xAA;
apu.out_ports_[1] = 0xBB;
// Setup tilemap pointers
constexpr uint32_t kBG1TilemapBase = 0x7E2000;
constexpr uint8_t kPointerAddrs[] = {0xBF, 0xC2, 0xC5, 0xC8, 0xCB,
0xCE, 0xD1, 0xD4, 0xD7, 0xDA, 0xDD};
for (int i = 0; i < 11; ++i) {
uint32_t wram_addr = kBG1TilemapBase + (i * 0x80);
snes_->Write(0x7E0000 | kPointerAddrs[i], wram_addr & 0xFF);
snes_->Write(0x7E0000 | (kPointerAddrs[i] + 1), (wram_addr >> 8) & 0xFF);
snes_->Write(0x7E0000 | (kPointerAddrs[i] + 2), (wram_addr >> 16) & 0xFF);
}
// Clear tilemap buffer
for (uint32_t i = 0; i < 0x2000; i++) {
snes_->Write(0x7E2000 + i, 0x00);
}
// Setup CPU for handler
cpu.PB = 0x01;
cpu.DB = 0x7E;
cpu.D = 0x0000;
cpu.SetSP(0x01FF);
cpu.status = 0x30;
cpu.E = 0;
cpu.X = data_offset;
cpu.Y = 0x0820; // Tilemap position (16,16)
cpu.PC = handler;
// Trace first 20 instructions
TraceExecution(20);
}
} // namespace test
} // namespace yaze
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