diff options
Diffstat (limited to 'vdp.hpp')
| -rw-r--r-- | vdp.hpp | 216 |
1 files changed, 108 insertions, 108 deletions
@@ -22,121 +22,121 @@ struct SpriteAttributeEntry { }; class VDP { - public: - constexpr VDP(const uint32_t base_address_a = VDP_START): base_address(base_address_a) {} - uint32_t Read(uint32_t offset, enum bitness); - void Write(uint32_t offset, enum bitness, uint32_t value); - bool Scanline(); // Returns true if display disabled or vblank happened - void Reset(); - constexpr const uint32_t* GetRenderedBuffer() const { return _rendered_buffer; } +public: + enum class RegID: size_t { + kModeSet1 = 0, + kModeSet2 = 1, + kScrollAAddress = 2, + kWindowAddress = 3, + kScrollBAddress = 4, + kSpritesTableAddress = 5, + kBackgroundColor = 7, + kHint = 10, + kModeSet3 = 11, + kModeSet4 = 12, + kHScrollTableAddress = 13, + kAutoIncrement = 15, + kScrollSize = 16, + kWindowHorizontalPosition = 17, + kWindowVertialPosition = 18, + kDMALengthCounterLow = 19, + kDMALengthCounterHigh = 20, + kDMASourceAddressLow = 21, + kDMASourceAddressMid = 22, + kDMASourceAddressHigh = 23, + kRegistersCount, ///< Keep it last + }; - const uint32_t base_address; + constexpr VDP(const uint32_t base_address_a = VDP_START): base_address(base_address_a) {} + uint32_t Read(uint32_t offset, enum bitness); + void Write(uint32_t offset, enum bitness, uint32_t value); + bool Scanline(); // Returns true if display disabled or vblank happened + void Reset(); + constexpr const uint32_t* GetRenderedBuffer() const { return _rendered_buffer; } + static const char* RegIDToString(RegID); - static constexpr size_t kRenderHeight = 224; - static constexpr size_t kRenderWidth = 320; - static constexpr size_t render_buffer_size = kRenderWidth * kRenderHeight * - sizeof(*reinterpret_cast<VDP*>(4)->GetRenderedBuffer()); + static constexpr size_t kRenderHeight = 224; + static constexpr size_t kRenderWidth = 320; + static constexpr size_t render_buffer_size = kRenderWidth * kRenderHeight * + sizeof(*reinterpret_cast<VDP*>(4)->GetRenderedBuffer()); - private: - struct StatusRegister { - bool fifo_not_empty{}; - bool fifo_full{}; - bool v_irq{}; - bool sprites_overflow{}; - bool sprites_collision{}; - bool odd_frame{}; - bool vblank{}; - bool hblank{}; - bool dma_busy{}; - bool pal_mode{}; - }; + const uint32_t base_address; - enum class AddressMode: uint8_t { - kVRAMWrite = 1, - kCRAMWrite = 3, - kVSRAMWrite = 5, - kVRAMRead = 0, - kCRAMRead = 8, - kVSRAMRead = 4, - }; +private: + struct StatusRegister { + bool fifo_not_empty{}; + bool fifo_full{}; + bool v_irq{}; + bool sprites_overflow{}; + bool sprites_collision{}; + bool odd_frame{}; + bool vblank{}; + bool hblank{}; + bool dma_busy{}; + bool pal_mode{}; + }; - enum class RegID: size_t { - kModeSet1 = 0, - kModeSet2 = 1, - kScrollAAddress = 2, - kWindowAddress = 3, - kScrollBAddress = 4, - kSpritesTableAddress = 5, - kBackgroundColor = 7, - kHint = 10, - kModeSet3 = 11, - kModeSet4 = 12, - kHScrollTableAddress = 13, - kAutoIncrement = 15, - kScrollSize = 16, - kWindowHorizontalPosition = 17, - kWindowVertialPosition = 18, - kDMALengthCounterLow = 19, - kDMALengthCounterHigh = 20, - kDMASourceAddressLow = 21, - kDMASourceAddressMid = 22, - kDMASourceAddressHigh = 23, - kRegistersCount, ///< Keep it last - }; + enum class AddressMode: uint8_t { + kVRAMWrite = 1, + kCRAMWrite = 3, + kVSRAMWrite = 5, + kVRAMRead = 0, + kCRAMRead = 8, + kVSRAMRead = 4, + }; - void renderScrollLine( - size_t line_index, - uint16_t plane_addr, - uint16_t hscroll_table_addr, - size_t plane_index, - size_t hcell_count, - size_t vcell_count); - void renderScrollALine(size_t line_index, size_t hcell_count, size_t vcell_count); - void renderScrollBLine(size_t line_index, size_t hcell_count, size_t vcell_count); - void renderSpritesLine(size_t line_index); - void renderSpriteOnTheLine(SpriteAttributeEntry, size_t line_index); - void writeData(uint8_t address_mode, uint16_t address, uint16_t value); - void writeControl(uint16_t value); - uint16_t readData(uint8_t address_mode, uint16_t address); - uint16_t readStatusRegister() const; - uint8_t* baseFromAddressMode(uint8_t address_mode); - const char* addressModeToString(uint8_t address_mode); - const char* regIDToString(RegID); + void renderScrollLine( + size_t line_index, + uint16_t plane_addr, + uint16_t hscroll_table_addr, + size_t plane_index, + size_t hcell_count, + size_t vcell_count); + void renderScrollALine(size_t line_index, size_t hcell_count, size_t vcell_count); + void renderScrollBLine(size_t line_index, size_t hcell_count, size_t vcell_count); + void renderSpritesLine(size_t line_index); + void renderSpriteOnTheLine(SpriteAttributeEntry, size_t line_index); + void writeData(uint8_t address_mode, uint16_t address, uint16_t value); + void writeControl(uint16_t value); + uint16_t readData(uint8_t address_mode, uint16_t address); + uint16_t readStatusRegister() const; + uint8_t* baseFromAddressMode(uint8_t address_mode); + const char* addressModeToString(uint8_t address_mode); - static void runDMAMemoryToVRAM( - uint8_t* base, - uint32_t source_address, - uint16_t destination_address, - uint16_t transfer_size, - uint8_t increment); - static void runDMAVRAMFill( - uint8_t* base, - uint16_t destination_address, - uint16_t transfer_size, - uint8_t increment, - uint16_t filler); - static void runDMAVRAMCopy(uint8_t* base); + static void runDMAMemoryToVRAM( + uint8_t* base, + uint32_t source_address, + uint16_t destination_address, + uint16_t transfer_size, + uint8_t increment); + static void runDMAVRAMFill( + uint8_t* base, + uint16_t destination_address, + uint16_t transfer_size, + uint8_t increment, + uint16_t filler); + static void runDMAVRAMCopy(uint8_t* base); - static constexpr size_t kRegistersCount = static_cast<size_t>(RegID::kRegistersCount); - static constexpr size_t kVRAMSize = 64*1024; - static constexpr size_t kCRAMSize = 64*2; - static constexpr size_t kVSRAMSize = 40*2; - static constexpr uint16_t kLinesPerScreenNTSC = 262; - static constexpr uint16_t kLinesPerScreenPAL = 312; + static constexpr size_t kRegistersCount = static_cast<size_t>(RegID::kRegistersCount); + static constexpr size_t kVRAMSize = 64*1024; + static constexpr size_t kCRAMSize = 64*2; + static constexpr size_t kVSRAMSize = 40*2; + static constexpr uint16_t kLinesPerScreenNTSC = 262; + static constexpr uint16_t kLinesPerScreenPAL = 312; - StatusRegister _status{}; - bool _control_write_second_word{}; - // DMA Fill is ready to kick in, waiting for filler set to data port - bool _dma_ready{}; - uint16_t _lines_counter{}; - // TODO: Make _address_mode of type AddressMode somehow and all private - // methods using it should be accepting AddressMode instead of uint8_t. - uint8_t _address_mode{}; - uint16_t _address{}; - uint8_t _reg[kRegistersCount]{}; - uint8_t _vram[kVRAMSize]{}; - uint8_t _cram[kCRAMSize]{}; - uint8_t _vsram[kVSRAMSize]{}; - uint32_t _rendered_buffer[kLinesPerScreenNTSC * kRenderWidth]{}; - bool _unclosed_sprites_list{}; + StatusRegister _status{}; + bool _control_write_second_word{}; + // DMA Fill is ready to kick in, waiting for filler set to data port + bool _dma_ready{}; + uint16_t _lines_counter{}; + // TODO: Make _address_mode of type AddressMode somehow and all private + // methods using it should be accepting AddressMode instead of uint8_t. + uint8_t _address_mode{}; + uint16_t _address{}; + uint8_t _reg[kRegistersCount]{}; + uint8_t _vram[kVRAMSize]{}; + uint8_t _cram[kCRAMSize]{}; + uint8_t _vsram[kVSRAMSize]{}; + uint32_t _rendered_buffer[kLinesPerScreenNTSC * kRenderWidth]{}; + bool _unclosed_sprites_list{}; }; |