663 lines
18 KiB
C#
663 lines
18 KiB
C#
using System;
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using BizHawk.Emulation.Common;
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using BizHawk.Common.NumberExtensions;
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using BizHawk.Common;
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namespace BizHawk.Emulation.Cores.Atari.A7800Hawk
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{
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// Emulates the Atari 7800 Maria graphics chip
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public class Maria
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{
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public A7800Hawk Core { get; set; }
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struct GFX_Object
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{
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public byte palette;
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public byte width;
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public ushort addr;
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public byte h_pos;
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// additional entries used only in 5-byte header mode
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public bool write_mode;
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public bool ind_mode;
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public byte[] obj; // up to 32 bytes can compose one object
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}
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// technically there is no limit on the number of graphics objects, but since dma is automatically killed
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// at the end of a scanline, we have an effective limit
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GFX_Object[] GFX_Objects = new GFX_Object[128];
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public byte[,] line_ram = new byte[2, 320];
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byte temp_check = 0;
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int GFX_index = 0;
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public int[] _palette;
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public int[] scanline_buffer = new int[320];
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// the Maria chip can directly access memory
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public Func<ushort, byte> ReadMemory;
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public int cycle;
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public int scanline;
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public int DLI_countdown;
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public bool sl_DMA_complete;
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public bool do_dma;
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public int DMA_phase = 0;
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public int DMA_phase_counter;
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public static int DMA_START_UP = 0;
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public static int DMA_HEADER = 1;
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public static int DMA_GRAPHICS = 2;
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public static int DMA_CHAR_MAP = 3;
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public static int DMA_SHUTDOWN_OTHER = 4;
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public static int DMA_SHUTDOWN_LAST = 5;
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public int header_read_time = 8; // default for 4 byte headers (10 for 5 bytes ones)
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public int graphics_read_time = 3; // depends on content of graphics header
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public int DMA_phase_next;
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public ushort display_zone_pointer;
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public int display_zone_counter;
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public byte current_DLL_offset;
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public ushort current_DLL_addr;
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public bool current_DLL_DLI;
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public bool current_DLL_H16;
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public bool current_DLL_H8;
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public bool global_write_mode;
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public int header_counter;
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public int header_pointer; // since headers could be 4 or 5 bytes, we need a seperate pointer
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// variables for drawing a pixel
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int color;
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int local_GFX_index;
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int temp_palette;
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int temp_bit_0;
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int temp_bit_1;
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int disp_mode;
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int pixel;
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// each frame contains 263 scanlines
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// each scanline consists of 113.5 CPU cycles (fast access) which equates to 454 Maria cycles
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// In total there are 29850.5 CPU cycles (fast access) in a frame
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public void RunFrame()
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{
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scanline = 0;
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global_write_mode = false;
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Core.Maria_regs[8] = 0x80; // indicates VBlank state
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// we start off in VBlank for 20 scanlines
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// at the end of vblank is a DMA to set up the display for the start of drawing
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// this is free time for the CPU to set up display lists
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while (scanline < 20)
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{
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Core.RunCPUCycle();
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cycle++;
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if (cycle == 454)
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{
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scanline++;
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cycle = 0;
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Core.tia._hsyncCnt = 0;
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Core.cpu.RDY = true;
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}
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}
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// "The end of vblank is made up of a DMA startup plus a long shut down"
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// Since long shut down loads up the next zone, this basically loads up the DLL for the first zone
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sl_DMA_complete = false;
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do_dma = false;
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Core.Maria_regs[8] = 0; // we have now left VBLank
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for (int i=0; i<454;i++)
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{
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if(i==28 && Core.Maria_regs[0x1C].Bit(6) && !Core.Maria_regs[0x1C].Bit(5))
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{
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Core.cpu_halt_pending = true;
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DMA_phase = DMA_START_UP;
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DMA_phase_counter = 0;
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do_dma = true;
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}
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else if (!sl_DMA_complete && do_dma)
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{
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RunDMA(true);
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}
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else if (sl_DMA_complete && current_DLL_DLI && !Core.cpu_is_halted)
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{
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// schedule an NMI for one maria tick into the future
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// (but set to 2 since it decrements immediately)
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DLI_countdown = 2;
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current_DLL_DLI = false;
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}
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if (DLI_countdown > 0)
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{
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DLI_countdown--;
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if (DLI_countdown == 0)
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{
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Core.cpu.NMI = true;
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}
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}
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Core.RunCPUCycle();
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}
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scanline++;
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cycle = 0;
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do_dma = false;
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sl_DMA_complete = false;
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Core.cpu.RDY = true;
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// Now proceed with the remaining scanlines
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// the first one is a pre-render line, since we didn't actually put any data into the buffer yet
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while (scanline < Core._screen_height)
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{
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if (cycle == 28 && Core.Maria_regs[0x1C].Bit(6) && !Core.Maria_regs[0x1C].Bit(5))
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{
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Core.cpu_halt_pending = true;
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DMA_phase = DMA_START_UP;
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DMA_phase_counter = 0;
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do_dma = true;
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sl_DMA_complete = false;
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}
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else if (!sl_DMA_complete && do_dma)
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{
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RunDMA(false);
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}
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else if (sl_DMA_complete && current_DLL_DLI && !Core.cpu_is_halted)
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{
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// schedule an NMI for one maria tick into the future
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// (but set to 2 since it decrements immediately)
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DLI_countdown = 2;
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current_DLL_DLI = false;
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}
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if (DLI_countdown > 0)
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{
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DLI_countdown--;
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if (DLI_countdown == 0)
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{
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Core.cpu.NMI = true;
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}
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}
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if (cycle == 428 && !sl_DMA_complete && do_dma && (DMA_phase == DMA_GRAPHICS || DMA_phase == DMA_HEADER))
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{
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//Console.WriteLine(scanline);
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if (current_DLL_offset == 0)
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{
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DMA_phase = DMA_SHUTDOWN_LAST;
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}
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else
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{
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DMA_phase = DMA_SHUTDOWN_OTHER;
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}
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DMA_phase_counter = 0;
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}
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Core.RunCPUCycle();
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//////////////////////////////////////////////
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// Drawing Start
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//////////////////////////////////////////////
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if (cycle >=133 && cycle < 453 && scanline > 20)
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{
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pixel = cycle - 133;
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local_GFX_index = (GFX_index == 1) ? 0 : 1; // whatever the current index is, we use the opposite
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disp_mode = Core.Maria_regs[0x1C] & 0x3;
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color = line_ram[local_GFX_index, pixel];
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if (disp_mode == 0)
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{
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// direct read, nothing to do
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}
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else if (disp_mode == 2) // note: 1 is not used
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{
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// there is a trick here to be aware of.
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// the renderer has no concept of objects, as it only has information on each pixel
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// but objects are specified in groups of 8 pixels.
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// however, since objects can only be placed in 160 resolution
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// we can pick bits based on whether the current pixel is even or odd
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temp_palette = color & 0x10;
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temp_bit_0 = 0;
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temp_bit_1 = 0;
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if (pixel % 2 == 0)
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{
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temp_bit_1 = color & 2;
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temp_bit_0 = (color & 8) >> 3;
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}
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else
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{
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temp_bit_1 = (color & 1) << 1;
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temp_bit_0 = (color & 4) >> 2;
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}
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color = temp_palette + temp_bit_1 + temp_bit_0;
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}
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else
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{
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// same as above, we can use the pixel index to pick the bits out
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if (pixel % 2 == 0)
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{
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color &= 0x1E;
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}
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else
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{
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color = (color & 0x1C) + ((color & 1) << 1);
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}
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}
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if ((color & 0x3) != 0)
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{
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scanline_buffer[pixel] = _palette[Core.Maria_regs[color]];
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}
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else
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{
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scanline_buffer[pixel] = _palette[Core.Maria_regs[0x00]];
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}
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// send buffer to the video buffer
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Core._vidbuffer[(scanline - 21) * 320 + pixel] = scanline_buffer[pixel];
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// clear the line ram
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line_ram[local_GFX_index, pixel] = 0;
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}
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//////////////////////////////////////////////
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// Drawing End
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//////////////////////////////////////////////
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cycle++;
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if (cycle == 454)
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{
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scanline++;
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cycle = 0;
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Core.tia._hsyncCnt = 0;
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Core.cpu.RDY = true;
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// swap sacnline buffers
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if (GFX_index == 1)
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{
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GFX_index = 0;
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}
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else
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{
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GFX_index = 1;
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}
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}
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}
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}
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public void RunDMA(bool short_dma)
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{
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// During DMA the CPU is HALTED, This appears to happen on the falling edge of Phi2
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// Current implementation is that a HALT request must be acknowledged in phi1
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// if the CPU is now in halted state, start DMA
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if (Core.cpu_is_halted)
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{
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DMA_phase_counter++;
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if (DMA_phase_counter==2 && DMA_phase==DMA_START_UP)
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{
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DMA_phase_counter = 0;
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if (short_dma)
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{
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DMA_phase = DMA_SHUTDOWN_LAST;
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// also here we load up the display list list
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// is the timing correct?
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display_zone_pointer = (ushort)((Core.Maria_regs[0xC] << 8) | Core.Maria_regs[0x10]);
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display_zone_counter = -1;
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}
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else
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{
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DMA_phase = DMA_HEADER;
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}
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return;
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}
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if (DMA_phase == DMA_HEADER)
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{
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// get all the data from the display list header
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if (DMA_phase_counter==1)
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{
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header_counter++;
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GFX_Objects[header_counter].addr = ReadMemory((ushort)(current_DLL_addr + header_pointer));
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header_pointer++;
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byte temp = ReadMemory((ushort)(current_DLL_addr + header_pointer));
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// if there is no width, then we must have an extended header
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// or at the end of this list
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if ((temp & 0x1F) == 0)
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{
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if (!temp.Bit(6))
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{
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// at the end of the list, time to end the DMA
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// check if we are at the end of the zone
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if (current_DLL_offset == 0)
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{
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DMA_phase_next = DMA_SHUTDOWN_LAST;
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}
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else
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{
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DMA_phase_next = DMA_SHUTDOWN_OTHER;
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}
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header_read_time = 8;
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header_pointer++;
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}
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else
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{
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// we are in 5 Byte header mode (i.e. using the character map)
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GFX_Objects[header_counter].write_mode = temp.Bit(7);
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global_write_mode = temp.Bit(7);
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GFX_Objects[header_counter].ind_mode = temp.Bit(5);
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header_pointer++;
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temp = (byte)(ReadMemory((ushort)(current_DLL_addr + header_pointer)));
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GFX_Objects[header_counter].addr |= (ushort)(temp << 8);
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header_pointer++;
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temp = ReadMemory((ushort)(current_DLL_addr + header_pointer));
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int temp_w = (temp & 0x1F); // this is the 2's complement of width (for reasons that escape me)
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if (temp_w == 0)
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{
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// important note here. In 5 byte mode, width 0 actually counts as 32
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GFX_Objects[header_counter].width = 32;
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}
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else
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{
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temp_w = (temp_w - 1);
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temp_w = (0x1F - temp_w);
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GFX_Objects[header_counter].width = (byte)(temp_w & 0x1F);
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}
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GFX_Objects[header_counter].palette = (byte)((temp & 0xE0) >> 5);
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header_pointer++;
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GFX_Objects[header_counter].h_pos = ReadMemory((ushort)(current_DLL_addr + header_pointer));
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header_pointer++;
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DMA_phase_next = DMA_GRAPHICS;
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header_read_time = 10;
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}
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}
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else
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{
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int temp_w = (temp & 0x1F); // this is the 2's complement of width (for reasons that escape me)
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temp_w = (temp_w - 1);
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temp_w = (0x1F - temp_w);
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GFX_Objects[header_counter].width = (byte)(temp_w & 0x1F);
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GFX_Objects[header_counter].palette = (byte)((temp & 0xE0) >> 5);
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header_pointer++;
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temp = (byte)(ReadMemory((ushort)(current_DLL_addr + header_pointer)));
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GFX_Objects[header_counter].addr |= (ushort)(temp << 8);
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header_pointer++;
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GFX_Objects[header_counter].h_pos = ReadMemory((ushort)(current_DLL_addr + header_pointer));
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header_pointer++;
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DMA_phase_next = DMA_GRAPHICS;
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GFX_Objects[header_counter].write_mode = global_write_mode;
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GFX_Objects[header_counter].ind_mode = false;
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header_read_time = 8;
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}
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}
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else if (DMA_phase_counter == header_read_time)
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{
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DMA_phase_counter = 0;
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DMA_phase = DMA_phase_next;
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}
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return;
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}
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if (DMA_phase == DMA_GRAPHICS)
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{
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if (DMA_phase_counter == 1)
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{
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ushort addr_t = 0;
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// in 5 byte mode, we first have to check if we are in direct or indirect mode
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if (GFX_Objects[header_counter].ind_mode)
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{
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int ch_size = 0;
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if (Core.Maria_regs[0x1C].Bit(4))
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{
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graphics_read_time = 9 * GFX_Objects[header_counter].width;
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ch_size = 2;
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}
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else
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{
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graphics_read_time = 6 * GFX_Objects[header_counter].width;
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ch_size = 1;
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}
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// the address here is specified by CHAR_BASE maria registers
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// ushort addr = (ushort)(GFX_Objects[header_counter].addr & 0xFF);
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for (int i = 0; i < GFX_Objects[header_counter].width; i++)
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{
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addr_t = ReadMemory((ushort)(GFX_Objects[header_counter].addr + i));
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addr_t |= (ushort)((Core.Maria_regs[0x14] + current_DLL_offset) << 8);
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if (((current_DLL_H16 && addr_t.Bit(12)) || (current_DLL_H8 && addr_t.Bit(11))) && (addr_t >= 0x8000))
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{
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if (i * ch_size < 128)
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{
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GFX_Objects[header_counter].obj[i * ch_size] = 0;
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}
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if ((i * ch_size + 1 < 128) && (ch_size == 2))
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{
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GFX_Objects[header_counter].obj[i * ch_size + 1] = 0;
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}
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if (i != 0)
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{
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if (ch_size == 1)
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{
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graphics_read_time -= 6;
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}
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else
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{
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graphics_read_time -= 9;
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}
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}
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}
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else
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{
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if (i * ch_size < 128)
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{
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GFX_Objects[header_counter].obj[i * ch_size] = ReadMemory(addr_t);
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fill_line_ram(GFX_Objects[header_counter].h_pos * 2, i, 0, ch_size, GFX_Objects[header_counter].obj[i * ch_size], GFX_Objects[header_counter].write_mode);
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}
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if (((i * ch_size + 1) < 128) && (ch_size == 2))
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{
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GFX_Objects[header_counter].obj[i * ch_size + 1] = ReadMemory((ushort)(addr_t + 1));
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fill_line_ram(GFX_Objects[header_counter].h_pos * 2, i, 1, ch_size, GFX_Objects[header_counter].obj[i * ch_size + 1], GFX_Objects[header_counter].write_mode);
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}
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}
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}
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}
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else
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{
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graphics_read_time = 3 * GFX_Objects[header_counter].width;
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for (int i = 0; i < GFX_Objects[header_counter].width; i++)
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{
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addr_t = (ushort)(GFX_Objects[header_counter].addr + (current_DLL_offset << 8) + i);
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if (((current_DLL_H16 && addr_t.Bit(12)) || (current_DLL_H8 && addr_t.Bit(11))) && (addr_t >= 0x8000))
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{
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GFX_Objects[header_counter].obj[i] = 0;
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if (i != 0)
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{
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graphics_read_time -= 3;
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}
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}
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else
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{
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GFX_Objects[header_counter].obj[i] = ReadMemory(addr_t);
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fill_line_ram(GFX_Objects[header_counter].h_pos * 2, i, 0, 1, GFX_Objects[header_counter].obj[i], GFX_Objects[header_counter].write_mode);
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}
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}
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}
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}
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if (DMA_phase_counter == graphics_read_time || graphics_read_time == 0)
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{
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// We have read the graphics data, for this header, now return to the header list
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// This loop will continue until a header indicates its time to stop
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DMA_phase = DMA_HEADER;
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DMA_phase_counter = 0;
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}
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return;
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}
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if (DMA_phase == DMA_SHUTDOWN_OTHER)
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{
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if (DMA_phase_counter == 6)
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{
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Core.cpu_resume_pending = true;
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sl_DMA_complete = true;
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current_DLL_offset -= 1; // this is reduced by one for each scanline, which changes where graphics are fetched
|
|
header_counter = -1;
|
|
header_pointer = 0;
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (DMA_phase == DMA_SHUTDOWN_LAST)
|
|
{
|
|
if (DMA_phase_counter==12)
|
|
{
|
|
Core.cpu_resume_pending = true;
|
|
sl_DMA_complete = true;
|
|
|
|
// on the last line of a zone, we load up the disply list list for the next zone.
|
|
display_zone_counter++;
|
|
ushort temp_addr = (ushort)(display_zone_pointer + 3 * display_zone_counter);
|
|
byte temp = ReadMemory(temp_addr);
|
|
|
|
current_DLL_addr = (ushort)(ReadMemory((ushort)(temp_addr + 1)) << 8);
|
|
current_DLL_addr |= ReadMemory((ushort)(temp_addr + 2));
|
|
|
|
current_DLL_offset = (byte)(temp & 0xF);
|
|
current_DLL_DLI = temp.Bit(7);
|
|
|
|
current_DLL_H16 = temp.Bit(6);
|
|
current_DLL_H8 = temp.Bit(5);
|
|
|
|
header_counter = -1;
|
|
header_pointer = 0;
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
public void fill_line_ram(int temp_start, int index, int doub_size, int ch_s, byte temp_byte, bool w_m)
|
|
{
|
|
if (w_m)
|
|
{
|
|
temp_start = temp_start + index * ch_s * 4 + doub_size * 4;
|
|
|
|
for (int z = 0; z < 4; z++)
|
|
{
|
|
if ((temp_start + z) % 512 < 320)
|
|
{
|
|
if (z < 2)
|
|
{
|
|
temp_check = (byte)((temp_byte & 0xC) + ((temp_byte >> 6) & 0x3));
|
|
}
|
|
else
|
|
{
|
|
temp_check = (byte)(((temp_byte & 0x3) << 2) + ((temp_byte >> 4) & 0x3));
|
|
}
|
|
|
|
if ((temp_check & 3) != 0)
|
|
{
|
|
line_ram[GFX_index, (temp_start + z) % 512] = temp_check;
|
|
line_ram[GFX_index, (temp_start + z) % 512] += (byte)((GFX_Objects[header_counter].palette & 4) << 2);
|
|
}
|
|
else if (Core.Maria_regs[0x1C].Bit(2))
|
|
{
|
|
// kangaroo mode, override transparency with zero
|
|
line_ram[GFX_index, (temp_start + z) % 512] = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
temp_start = temp_start + index * ch_s * 8 + doub_size * 8;
|
|
|
|
for (int z = 0; z < 8; z++)
|
|
{
|
|
if (((temp_start + z) % 512) < 320)
|
|
{
|
|
if (z < 2)
|
|
{
|
|
temp_check = (byte)((temp_byte >> 6) & 0x3);
|
|
}
|
|
else if (z < 4)
|
|
{
|
|
temp_check = (byte)((temp_byte >> 4) & 0x3);
|
|
}
|
|
else if (z < 6)
|
|
{
|
|
temp_check = (byte)((temp_byte >> 2) & 0x3);
|
|
}
|
|
else
|
|
{
|
|
temp_check = (byte)(temp_byte & 0x3);
|
|
}
|
|
|
|
if (temp_check != 0)
|
|
{
|
|
line_ram[GFX_index, (temp_start + z) % 512] = temp_check;
|
|
line_ram[GFX_index, (temp_start + z) % 512] += (byte)(GFX_Objects[header_counter].palette << 2);
|
|
}
|
|
else if (Core.Maria_regs[0x1C].Bit(2))
|
|
{
|
|
// kangaroo mode, override transparency with zero
|
|
line_ram[GFX_index, (temp_start + z) % 512] = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
public void Reset()
|
|
{
|
|
for (int i = 0; i < 128; i++)
|
|
{
|
|
GFX_Objects[i].obj = new byte[128];
|
|
}
|
|
}
|
|
|
|
// Most of the Maria state is captured in Maria Regs in the core
|
|
// Only write Mode is persistent and outside of the regs
|
|
// also since DMA is always killed at scanline boundaries, most related check variables are also not needed
|
|
public void SyncState(Serializer ser)
|
|
{
|
|
ser.BeginSection("Maria");
|
|
|
|
ser.Sync("GFX_index", ref GFX_index);
|
|
|
|
ser.EndSection();
|
|
}
|
|
}
|
|
}
|