srctree

Johan Norberg parent cfd1d059 ae8cc7d3
Add split xy scrolling test

core/src/ppu.cpp added: 29, removed: 3, total 26

@@ -115,7 +115,6 @@ void Ppu::write_byte(uint16_t addr, uint8_t byte) {

registers_->temp_vram_addr.value() & 0x00FFu;

registers_->temp_vram_addr = PpuVram(upper_byte | lower_byte);

registers_->write_toggle = true;

}

} else if (addr == kPpuData) {

mmu_->write_byte(registers_->vram_addr.value(), byte);

core/test/src/test_ppu.cpp added: 29, removed: 3, total 26

@@ -103,6 +103,33 @@ TEST_F(PpuTest, scrolling_tests) {

EXPECT_EQ(expected, registers);

}

// Test from the example shown at:

// https://wiki.nesdev.org/w/index.php/PPU_scrolling#Details

TEST_F(PpuTest, split_xy_scrolling_tests) {

registers.temp_vram_addr = PpuVram(0b11111111'00000000u);

expected.temp_vram_addr = PpuVram(0b00000100'00000000u);

expected.write_toggle = true;

ppu->write_byte(0x2006, 0x04);

EXPECT_EQ(expected, registers);

expected.temp_vram_addr = PpuVram(0b01100100'11100000u);

expected.write_toggle = false;

ppu->write_byte(0x2005, 0x3E);

EXPECT_EQ(expected, registers);

expected.temp_vram_addr = PpuVram(0b01100100'11101111u);

expected.write_toggle = true;

expected.fine_x_scroll = 0b0101u;

ppu->write_byte(0x2005, 0x7D);

EXPECT_EQ(expected, registers);

expected.temp_vram_addr = PpuVram(0b01100100'11101111u);

expected.vram_addr = expected.temp_vram_addr;

expected.write_toggle = false;

ppu->write_byte(0x2006, 0xEF);

EXPECT_EQ(expected, registers);

}

TEST_F(PpuTest, nmi_is_triggered_when_it_should) {

bool triggered = false;

registers.ctrl = expected.ctrl = 0b1000'0000;