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- "use strict";
- var
- /**
- * Always 64k
- * @const
- */
- VGA_BANK_SIZE = 64 * 1024,
- /** @const */
- MAX_XRES = 2560,
- /** @const */
- MAX_YRES = 1600,
- /** @const */
- MAX_BPP = 32;
- /** @const */
- //var VGA_LFB_ADDRESS = 0xFE000000; // set by seabios
- var VGA_LFB_ADDRESS = 0xE0000000;
- /**
- * @const
- * Equals the maximum number of pixels for non svga.
- * 8 pixels per byte.
- */
- var VGA_PIXEL_BUFFER_SIZE = 8 * VGA_BANK_SIZE;
- /** @const */
- var VGA_MIN_MEMORY_SIZE = 4 * VGA_BANK_SIZE;
- /**
- * @const
- * @see {@link http://www.osdever.net/FreeVGA/vga/graphreg.htm#06}
- */
- var VGA_HOST_MEMORY_SPACE_START = Uint32Array.from([
- 0xA0000,
- 0xA0000,
- 0xB0000,
- 0xB8000,
- ]);
- /**
- * @const
- * @see {@link http://www.osdever.net/FreeVGA/vga/graphreg.htm#06}
- */
- var VGA_HOST_MEMORY_SPACE_SIZE = Uint32Array.from([
- 0x20000, // 128K
- 0x10000, // 64K
- 0x8000, // 32K
- 0x8000, // 32K
- ]);
- /**
- * @constructor
- * @param {CPU} cpu
- * @param {BusConnector} bus
- * @param {number} vga_memory_size
- */
- function VGAScreen(cpu, bus, vga_memory_size)
- {
- this.cpu = cpu;
- /** @const @type {BusConnector} */
- this.bus = bus;
- this.vga_memory_size = vga_memory_size;
- /** @type {number} */
- this.cursor_address = 0;
- /** @type {number} */
- this.cursor_scanline_start = 0xE;
- /** @type {number} */
- this.cursor_scanline_end = 0xF;
- /**
- * Number of columns in text mode
- * @type {number}
- */
- this.max_cols = 80;
- /**
- * Number of rows in text mode
- * @type {number}
- */
- this.max_rows = 25;
- /**
- * Width in pixels in graphical mode
- * @type {number}
- */
- this.screen_width = 0;
- /**
- * Height in pixels in graphical mode
- * @type {number}
- */
- this.screen_height = 0;
- /**
- * Logical width in pixels of virtual buffer available for panning
- * @type {number}
- */
- this.virtual_width = 0;
- /**
- * Logical height in pixels of virtual buffer available for panning
- * @type {number}
- */
- this.virtual_height = 0;
- /**
- * The rectangular fragments of the image buffer, and their destination
- * locations, to be drawn every screen_fill_buffer during VGA modes.
- * @type {Array<Object<string, number>>}
- */
- this.layers = [];
- /**
- * video memory start address
- * @type {number}
- */
- this.start_address = 0;
- /**
- * Start address - a copy of start_address that only gets updated
- * during VSync, used for panning and page flipping
- * @type {number}
- */
- this.start_address_latched = 0;
- /**
- * Unimplemented CRTC registers go here
- */
- this.crtc = new Uint8Array(0x19);
- // Implemented CRTC registers:
- /** @type {number} */
- this.crtc_mode = 0;
- /** @type {number} */
- this.horizontal_display_enable_end = 0;
- /** @type {number} */
- this.horizontal_blank_start = 0;
- /** @type {number} */
- this.vertical_display_enable_end = 0;
- /** @type {number} */
- this.vertical_blank_start = 0;
- /** @type {number} */
- this.underline_location_register = 0;
- /** @type {number} */
- this.preset_row_scan = 0;
- /** @type {number} */
- this.offset_register = 0;
- /** @type {number} */
- this.line_compare = 0;
- // End of CRTC registers
- /**
- * Used for svga, e.g. banked modes
- * @type{boolean}
- */
- this.graphical_mode_is_linear = true;
- /** @type {boolean} */
- this.graphical_mode = false;
- setTimeout(() => { bus.send("screen-set-mode", this.graphical_mode); }, 0);
- /*
- * VGA palette containing 256 colors for video mode 13, svga 8bpp, etc.
- * Needs to be initialised by the BIOS
- */
- this.vga256_palette = new Int32Array(256);
- /**
- * VGA read latches
- * @type{number}
- */
- this.latch_dword = 0;
- /** @type {number} */
- this.svga_version = 0xB0C5;
- /** @type {number} */
- this.svga_width = 0;
- /** @type {number} */
- this.svga_height = 0;
- this.svga_enabled = false;
- /** @type {number} */
- this.svga_bpp = 32;
- /** @type {number} */
- this.svga_bank_offset = 0;
- /**
- * The video buffer offset created by VBE_DISPI_INDEX_Y_OFFSET
- * In bytes
- * @type {number}
- */
- this.svga_offset = 0;
- this.svga_offset_y = 0;
- const pci_revision = 0; // set to 2 for qemu extended registers
- // Experimental, could probably need some changes
- // 01:00.0 VGA compatible controller: NVIDIA Corporation GT216 [GeForce GT 220] (rev a2)
- this.pci_space = [
- 0x34, 0x12, 0x11, 0x11, 0x03, 0x01, 0x00, 0x00, pci_revision, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x00,
- 0x08, VGA_LFB_ADDRESS >>> 8, VGA_LFB_ADDRESS >>> 16, VGA_LFB_ADDRESS >>> 24,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xbf, 0xfe, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf4, 0x1a, 0x00, 0x11,
- 0x00, 0x00, 0xbe, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- ];
- this.pci_id = 0x12 << 3;
- this.pci_bars = [
- {
- size: vga_memory_size,
- },
- ];
- // TODO: Should be matched with vga bios size and mapping address
- // Seabios config for this device:
- // CONFIG_VGA_PCI=y
- // CONFIG_OVERRIDE_PCI_ID=y
- // CONFIG_VGA_VID=0x10de
- // CONFIG_VGA_DID=0x0a20
- this.pci_rom_size = 0x10000;
- this.pci_rom_address = 0xFEB00000;
- this.name = "vga";
- this.stats = {
- is_graphical: false,
- res_x: 0,
- res_y: 0,
- bpp: 0,
- };
- this.index_crtc = 0;
- // index for setting colors through port 3C9h
- this.dac_color_index_write = 0;
- this.dac_color_index_read = 0;
- this.dac_state = 0;
- this.dac_mask = 0xFF;
- this.dac_map = new Uint8Array(0x10);
- this.attribute_controller_index = -1;
- this.palette_source = 0x20;
- this.attribute_mode = 0;
- this.color_plane_enable = 0;
- this.horizontal_panning = 0;
- this.color_select = 0;
- this.sequencer_index = -1;
- // bitmap of planes 0-3
- this.plane_write_bm = 0xF;
- this.sequencer_memory_mode = 0;
- this.clocking_mode = 0;
- this.graphics_index = -1;
- this.plane_read = 0, // value 0-3, which plane to read
- this.planar_mode = 0;
- this.planar_rotate_reg = 0;
- this.planar_bitmap = 0xFF;
- this.planar_setreset = 0;
- this.planar_setreset_enable = 0;
- this.miscellaneous_graphics_register = 0;
- this.color_compare = 0;
- this.color_dont_care = 0;
- this.max_scan_line = 0;
- this.miscellaneous_output_register = 0xff;
- this.port_3DA_value = 0xFF;
- var io = cpu.io;
- io.register_write(0x3C0, this, this.port3C0_write);
- io.register_read(0x3C0, this, this.port3C0_read, this.port3C0_read16);
- io.register_read(0x3C1, this, this.port3C1_read);
- io.register_write(0x3C2, this, this.port3C2_write);
- io.register_write_consecutive(0x3C4, this, this.port3C4_write, this.port3C5_write);
- io.register_read(0x3C4, this, this.port3C4_read);
- io.register_read(0x3C5, this, this.port3C5_read);
- io.register_write_consecutive(0x3CE, this, this.port3CE_write, this.port3CF_write);
- io.register_read(0x3CE, this, this.port3CE_read);
- io.register_read(0x3CF, this, this.port3CF_read);
- io.register_read(0x3C6, this, this.port3C6_read);
- io.register_write(0x3C6, this, this.port3C6_write);
- io.register_write(0x3C7, this, this.port3C7_write);
- io.register_read(0x3C7, this, this.port3C7_read);
- io.register_write(0x3C8, this, this.port3C8_write);
- io.register_read(0x3C8, this, this.port3C8_read);
- io.register_write(0x3C9, this, this.port3C9_write);
- io.register_read(0x3C9, this, this.port3C9_read);
- io.register_read(0x3CC, this, this.port3CC_read);
- io.register_write_consecutive(0x3D4, this, this.port3D4_write, this.port3D5_write);
- io.register_read(0x3D4, this, this.port3D4_read);
- io.register_read(0x3D5, this, this.port3D5_read, () => {
- dbg_log("Warning: 16-bit read from 3D5", LOG_VGA);
- return this.port3D5_read();
- });
- io.register_read(0x3CA, this, function() { dbg_log("3CA read", LOG_VGA); return 0; });
- io.register_read(0x3DA, this, this.port3DA_read);
- io.register_read(0x3BA, this, this.port3DA_read);
- // Bochs VBE Extensions
- // http://wiki.osdev.org/Bochs_VBE_Extensions
- this.dispi_index = -1;
- this.dispi_enable_value = 0;
- io.register_write(0x1CE, this, undefined, this.port1CE_write);
- io.register_write(0x1CF, this, undefined, this.port1CF_write);
- io.register_read(0x1CF, this, undefined, this.port1CF_read);
- if(this.vga_memory_size === undefined || this.vga_memory_size < VGA_MIN_MEMORY_SIZE)
- {
- this.vga_memory_size = VGA_MIN_MEMORY_SIZE;
- dbg_log("vga memory size rounded up to " + this.vga_memory_size, LOG_VGA);
- }
- else if(this.vga_memory_size & (VGA_BANK_SIZE - 1))
- {
- // round up to next 64k
- this.vga_memory_size |= VGA_BANK_SIZE - 1;
- this.vga_memory_size++;
- }
- const vga_offset = cpu.svga_allocate_memory(this.vga_memory_size);
- this.svga_memory = v86util.view(Uint8Array, cpu.wasm_memory, vga_offset, this.vga_memory_size);
- this.diff_addr_min = this.vga_memory_size;
- this.diff_addr_max = 0;
- this.diff_plot_min = this.vga_memory_size;
- this.diff_plot_max = 0;
- this.image_data = null;
- bus.register("screen-fill-buffer", function()
- {
- this.screen_fill_buffer();
- }, this);
- this.vga_memory = new Uint8Array(4 * VGA_BANK_SIZE);
- this.plane0 = new Uint8Array(this.vga_memory.buffer, 0 * VGA_BANK_SIZE, VGA_BANK_SIZE);
- this.plane1 = new Uint8Array(this.vga_memory.buffer, 1 * VGA_BANK_SIZE, VGA_BANK_SIZE);
- this.plane2 = new Uint8Array(this.vga_memory.buffer, 2 * VGA_BANK_SIZE, VGA_BANK_SIZE);
- this.plane3 = new Uint8Array(this.vga_memory.buffer, 3 * VGA_BANK_SIZE, VGA_BANK_SIZE);
- this.pixel_buffer = new Uint8Array(VGA_PIXEL_BUFFER_SIZE);
- var me = this;
- io.mmap_register(0xA0000, 0x20000,
- function(addr) { return me.vga_memory_read(addr); },
- function(addr, value) { me.vga_memory_write(addr, value); }
- );
- cpu.devices.pci.register_device(this);
- }
- VGAScreen.prototype.get_state = function()
- {
- var state = [];
- state[0] = this.vga_memory_size;
- state[1] = this.cursor_address;
- state[2] = this.cursor_scanline_start;
- state[3] = this.cursor_scanline_end;
- state[4] = this.max_cols;
- state[5] = this.max_rows;
- state[6] = this.vga_memory;
- state[7] = this.dac_state;
- state[8] = this.start_address;
- state[9] = this.graphical_mode;
- state[10] = this.vga256_palette;
- state[11] = this.latch_dword;
- state[12] = this.color_compare;
- state[13] = this.color_dont_care;
- state[14] = this.miscellaneous_graphics_register;
- state[15] = this.svga_width;
- state[16] = this.svga_height;
- state[17] = this.crtc_mode;
- state[18] = this.svga_enabled;
- state[19] = this.svga_bpp;
- state[20] = this.svga_bank_offset;
- state[21] = this.svga_offset;
- state[22] = this.index_crtc;
- state[23] = this.dac_color_index_write;
- state[24] = this.dac_color_index_read;
- state[25] = this.dac_map;
- state[26] = this.sequencer_index;
- state[27] = this.plane_write_bm;
- state[28] = this.sequencer_memory_mode;
- state[29] = this.graphics_index;
- state[30] = this.plane_read;
- state[31] = this.planar_mode;
- state[32] = this.planar_rotate_reg;
- state[33] = this.planar_bitmap;
- state[34] = this.max_scan_line;
- state[35] = this.miscellaneous_output_register;
- state[36] = this.port_3DA_value;
- state[37] = this.dispi_index;
- state[38] = this.dispi_enable_value;
- state[39] = this.svga_memory;
- state[40] = this.graphical_mode_is_linear;
- state[41] = this.attribute_controller_index;
- state[42] = this.offset_register;
- state[43] = this.planar_setreset;
- state[44] = this.planar_setreset_enable;
- state[45] = this.start_address_latched;
- state[46] = this.crtc;
- state[47] = this.horizontal_display_enable_end;
- state[48] = this.horizontal_blank_start;
- state[49] = this.vertical_display_enable_end;
- state[50] = this.vertical_blank_start;
- state[51] = this.underline_location_register;
- state[52] = this.preset_row_scan;
- state[53] = this.offset_register;
- state[54] = this.palette_source;
- state[55] = this.attribute_mode;
- state[56] = this.color_plane_enable;
- state[57] = this.horizontal_panning;
- state[58] = this.color_select;
- state[59] = this.clocking_mode;
- state[60] = this.line_compare;
- state[61] = this.pixel_buffer;
- state[62] = this.dac_mask;
- return state;
- };
- VGAScreen.prototype.set_state = function(state)
- {
- this.vga_memory_size = state[0];
- this.cursor_address = state[1];
- this.cursor_scanline_start = state[2];
- this.cursor_scanline_end = state[3];
- this.max_cols = state[4];
- this.max_rows = state[5];
- state[6] && this.vga_memory.set(state[6]);
- this.dac_state = state[7];
- this.start_address = state[8];
- this.graphical_mode = state[9];
- this.vga256_palette = state[10];
- this.latch_dword = state[11];
- this.color_compare = state[12];
- this.color_dont_care = state[13];
- this.miscellaneous_graphics_register = state[14];
- this.svga_width = state[15];
- this.svga_height = state[16];
- this.crtc_mode = state[17];
- this.svga_enabled = state[18];
- this.svga_bpp = state[19];
- this.svga_bank_offset = state[20];
- this.svga_offset = state[21];
- this.index_crtc = state[22];
- this.dac_color_index_write = state[23];
- this.dac_color_index_read = state[24];
- this.dac_map = state[25];
- this.sequencer_index = state[26];
- this.plane_write_bm = state[27];
- this.sequencer_memory_mode = state[28];
- this.graphics_index = state[29];
- this.plane_read = state[30];
- this.planar_mode = state[31];
- this.planar_rotate_reg = state[32];
- this.planar_bitmap = state[33];
- this.max_scan_line = state[34];
- this.miscellaneous_output_register = state[35];
- this.port_3DA_value = state[36];
- this.dispi_index = state[37];
- this.dispi_enable_value = state[38];
- this.svga_memory.set(state[39]);
- this.graphical_mode_is_linear = state[40];
- this.attribute_controller_index = state[41];
- this.offset_register = state[42];
- this.planar_setreset = state[43];
- this.planar_setreset_enable = state[44];
- this.start_address_latched = state[45];
- this.crtc.set(state[46]);
- this.horizontal_display_enable_end = state[47];
- this.horizontal_blank_start = state[48];
- this.vertical_display_enable_end = state[49];
- this.vertical_blank_start = state[50];
- this.underline_location_register = state[51];
- this.preset_row_scan = state[52];
- this.offset_register = state[53];
- this.palette_source = state[54];
- this.attribute_mode = state[55];
- this.color_plane_enable = state[56];
- this.horizontal_panning = state[57];
- this.color_select = state[58];
- this.clocking_mode = state[59];
- this.line_compare = state[60];
- state[61] && this.pixel_buffer.set(state[61]);
- this.dac_mask = state[62] === undefined ? 0xFF : state[62];
- this.bus.send("screen-set-mode", this.graphical_mode);
- if(this.graphical_mode)
- {
- // Ensure set_size_graphical will update
- this.screen_width = 0;
- this.screen_height = 0;
- if(this.svga_enabled)
- {
- this.set_size_graphical(this.svga_width, this.svga_height,
- this.svga_bpp, this.svga_width, this.svga_height);
- this.update_layers();
- }
- else
- {
- this.update_vga_size();
- this.update_layers();
- this.complete_replot();
- }
- }
- else
- {
- this.set_size_text(this.max_cols, this.max_rows);
- this.update_cursor_scanline();
- this.update_cursor();
- }
- this.complete_redraw();
- };
- VGAScreen.prototype.vga_memory_read = function(addr)
- {
- if(this.svga_enabled && this.graphical_mode_is_linear)
- {
- return this.cpu.read8((addr - 0xA0000 | this.svga_bank_offset) + VGA_LFB_ADDRESS | 0);
- }
- var memory_space_select = this.miscellaneous_graphics_register >> 2 & 0x3;
- addr -= VGA_HOST_MEMORY_SPACE_START[memory_space_select];
- // VGA chip only decodes addresses within the selected memory space.
- if(addr < 0 || addr >= VGA_HOST_MEMORY_SPACE_SIZE[memory_space_select])
- {
- dbg_log("vga read outside memory space: addr:" + h(addr), LOG_VGA);
- return 0;
- }
- this.latch_dword = this.plane0[addr];
- this.latch_dword |= this.plane1[addr] << 8;
- this.latch_dword |= this.plane2[addr] << 16;
- this.latch_dword |= this.plane3[addr] << 24;
- if(this.planar_mode & 0x08)
- {
- // read mode 1
- var reading = 0xFF;
- if(this.color_dont_care & 0x1)
- {
- reading &= this.plane0[addr] ^ ~(this.color_compare & 0x1 ? 0xFF : 0x00);
- }
- if(this.color_dont_care & 0x2)
- {
- reading &= this.plane1[addr] ^ ~(this.color_compare & 0x2 ? 0xFF : 0x00);
- }
- if(this.color_dont_care & 0x4)
- {
- reading &= this.plane2[addr] ^ ~(this.color_compare & 0x4 ? 0xFF : 0x00);
- }
- if(this.color_dont_care & 0x8)
- {
- reading &= this.plane3[addr] ^ ~(this.color_compare & 0x8 ? 0xFF : 0x00);
- }
- return reading;
- }
- else
- {
- // read mode 0
- var plane = this.plane_read;
- if(!this.graphical_mode)
- {
- // We currently put all text data linearly
- plane = 0;
- }
- else if(this.sequencer_memory_mode & 0x8)
- {
- // Chain 4
- plane = addr & 0x3;
- addr &= ~0x3;
- }
- else if(this.planar_mode & 0x10)
- {
- // Odd/Even host read
- plane = addr & 0x1;
- addr &= ~0x1;
- }
- return this.vga_memory[plane << 16 | addr];
- }
- };
- VGAScreen.prototype.vga_memory_write = function(addr, value)
- {
- if(this.svga_enabled && this.graphical_mode && this.graphical_mode_is_linear)
- {
- // vbe banked mode
- this.cpu.write8((addr - 0xA0000 | this.svga_bank_offset) + VGA_LFB_ADDRESS | 0, value);
- return;
- }
- var memory_space_select = this.miscellaneous_graphics_register >> 2 & 0x3;
- addr -= VGA_HOST_MEMORY_SPACE_START[memory_space_select];
- if(addr < 0 || addr >= VGA_HOST_MEMORY_SPACE_SIZE[memory_space_select])
- {
- dbg_log("vga write outside memory space: addr:" + h(addr) + ", value:" + h(value), LOG_VGA);
- return;
- }
- if(this.graphical_mode)
- {
- this.vga_memory_write_graphical(addr, value);
- }
- else
- {
- if(!(this.plane_write_bm & 0x3))
- {
- // Ignore writes to font planes.
- return;
- }
- this.vga_memory_write_text_mode(addr, value);
- }
- };
- VGAScreen.prototype.vga_memory_write_graphical = function(addr, value)
- {
- var plane_dword;
- var write_mode = this.planar_mode & 3;
- var bitmask = this.apply_feed(this.planar_bitmap);
- var setreset_dword = this.apply_expand(this.planar_setreset);
- var setreset_enable_dword = this.apply_expand(this.planar_setreset_enable);
- // Write modes - see http://www.osdever.net/FreeVGA/vga/graphreg.htm#05
- switch(write_mode)
- {
- case 0:
- value = this.apply_rotate(value);
- plane_dword = this.apply_feed(value);
- plane_dword = this.apply_setreset(plane_dword, setreset_enable_dword);
- plane_dword = this.apply_logical(plane_dword, this.latch_dword);
- plane_dword = this.apply_bitmask(plane_dword, bitmask);
- break;
- case 1:
- plane_dword = this.latch_dword;
- break;
- case 2:
- plane_dword = this.apply_expand(value);
- plane_dword = this.apply_logical(plane_dword, this.latch_dword);
- plane_dword = this.apply_bitmask(plane_dword, bitmask);
- break;
- case 3:
- value = this.apply_rotate(value);
- bitmask &= this.apply_feed(value);
- plane_dword = setreset_dword;
- plane_dword = this.apply_bitmask(plane_dword, bitmask);
- break;
- }
- var plane_select = 0xF;
- switch(this.sequencer_memory_mode & 0xC)
- {
- // Odd/Even (aka chain 2)
- case 0x0:
- plane_select = 0x5 << (addr & 0x1);
- addr &= ~0x1;
- break;
- // Chain 4
- // Note: FreeVGA may have mistakenly stated that this bit field is
- // for system read only, yet the IBM Open Source Graphics Programmer's
- // Reference Manual explicitly states "both read and write".
- case 0x8:
- case 0xC:
- plane_select = 1 << (addr & 0x3);
- addr &= ~0x3;
- break;
- }
- // Plane masks take precedence
- // See: http://www.osdever.net/FreeVGA/vga/seqreg.htm#02
- plane_select &= this.plane_write_bm;
- if(plane_select & 0x1) this.plane0[addr] = (plane_dword >> 0) & 0xFF;
- if(plane_select & 0x2) this.plane1[addr] = (plane_dword >> 8) & 0xFF;
- if(plane_select & 0x4) this.plane2[addr] = (plane_dword >> 16) & 0xFF;
- if(plane_select & 0x8) this.plane3[addr] = (plane_dword >> 24) & 0xFF;
- var pixel_addr = this.vga_addr_to_pixel(addr);
- this.partial_replot(pixel_addr, pixel_addr + 7);
- };
- /**
- * Copies data_byte into the four planes, with each plane
- * represented by an 8-bit field inside the dword.
- * @param {number} data_byte
- * @return {number} 32-bit number representing the bytes for each plane.
- */
- VGAScreen.prototype.apply_feed = function(data_byte)
- {
- var dword = data_byte;
- dword |= data_byte << 8;
- dword |= data_byte << 16;
- dword |= data_byte << 24;
- return dword;
- };
- /**
- * Expands bits 0 to 3 to ocupy bits 0 to 31. Each
- * bit is expanded to 0xFF if set or 0x00 if clear.
- * @param {number} data_byte
- * @return {number} 32-bit number representing the bytes for each plane.
- */
- VGAScreen.prototype.apply_expand = function(data_byte)
- {
- var dword = data_byte & 0x1 ? 0xFF : 0x00;
- dword |= (data_byte & 0x2 ? 0xFF : 0x00) << 8;
- dword |= (data_byte & 0x4 ? 0xFF : 0x00) << 16;
- dword |= (data_byte & 0x8 ? 0xFF : 0x00) << 24;
- return dword;
- };
- /**
- * Planar Write - Barrel Shifter
- * @param {number} data_byte
- * @return {number}
- * @see {@link http://www.phatcode.net/res/224/files/html/ch25/25-01.html#Heading3}
- * @see {@link http://www.osdever.net/FreeVGA/vga/graphreg.htm#03}
- */
- VGAScreen.prototype.apply_rotate = function(data_byte)
- {
- var wrapped = data_byte | (data_byte << 8);
- var count = this.planar_rotate_reg & 0x7;
- var shifted = wrapped >>> count;
- return shifted & 0xFF;
- };
- /**
- * Planar Write - Set / Reset Circuitry
- * @param {number} data_dword
- * @param {number} enable_dword
- * @return {number}
- * @see {@link http://www.phatcode.net/res/224/files/html/ch25/25-03.html#Heading5}
- * @see {@link http://www.osdever.net/FreeVGA/vga/graphreg.htm#00}
- */
- VGAScreen.prototype.apply_setreset = function(data_dword, enable_dword)
- {
- var setreset_dword = this.apply_expand(this.planar_setreset);
- data_dword |= enable_dword & setreset_dword;
- data_dword &= ~enable_dword | setreset_dword;
- return data_dword;
- };
- /**
- * Planar Write - ALU Unit
- * @param {number} data_dword
- * @param {number} latch_dword
- * @return {number}
- * @see {@link http://www.phatcode.net/res/224/files/html/ch24/24-01.html#Heading3}
- * @see {@link http://www.osdever.net/FreeVGA/vga/graphreg.htm#03}
- */
- VGAScreen.prototype.apply_logical = function(data_dword, latch_dword)
- {
- switch(this.planar_rotate_reg & 0x18)
- {
- case 0x08:
- return data_dword & latch_dword;
- case 0x10:
- return data_dword | latch_dword;
- case 0x18:
- return data_dword ^ latch_dword;
- }
- return data_dword;
- };
- /**
- * Planar Write - Bitmask Unit
- * @param {number} data_dword
- * @param {number} bitmask_dword
- * @return {number}
- * @see {@link http://www.phatcode.net/res/224/files/html/ch25/25-01.html#Heading2}
- * @see {@link http://www.osdever.net/FreeVGA/vga/graphreg.htm#08}
- */
- VGAScreen.prototype.apply_bitmask = function(data_dword, bitmask_dword)
- {
- var plane_dword = bitmask_dword & data_dword;
- plane_dword |= ~bitmask_dword & this.latch_dword;
- return plane_dword;
- };
- VGAScreen.prototype.text_mode_redraw = function()
- {
- var addr = this.start_address << 1,
- chr,
- color;
- for(var row = 0; row < this.max_rows; row++)
- {
- for(var col = 0; col < this.max_cols; col++)
- {
- chr = this.vga_memory[addr];
- color = this.vga_memory[addr | 1];
- this.bus.send("screen-put-char", [row, col, chr,
- this.vga256_palette[this.dac_mask & this.dac_map[color >> 4 & 0xF]],
- this.vga256_palette[this.dac_mask & this.dac_map[color & 0xF]]]);
- addr += 2;
- }
- }
- };
- VGAScreen.prototype.vga_memory_write_text_mode = function(addr, value)
- {
- var memory_start = (addr >> 1) - this.start_address,
- row = memory_start / this.max_cols | 0,
- col = memory_start % this.max_cols,
- chr,
- color;
- // XXX: Should handle 16 bit write if possible
- if(addr & 1)
- {
- color = value;
- chr = this.vga_memory[addr & ~1];
- }
- else
- {
- chr = value;
- color = this.vga_memory[addr | 1];
- }
- this.bus.send("screen-put-char", [row, col, chr,
- this.vga256_palette[this.dac_mask & this.dac_map[color >> 4 & 0xF]],
- this.vga256_palette[this.dac_mask & this.dac_map[color & 0xF]]]);
- this.vga_memory[addr] = value;
- };
- VGAScreen.prototype.update_cursor = function()
- {
- var row = (this.cursor_address - this.start_address) / this.max_cols | 0,
- col = (this.cursor_address - this.start_address) % this.max_cols;
- row = Math.min(this.max_rows - 1, row);
- this.bus.send("screen-update-cursor", [row, col]);
- };
- VGAScreen.prototype.complete_redraw = function()
- {
- dbg_log("complete redraw", LOG_VGA);
- if(this.graphical_mode)
- {
- if(this.svga_enabled)
- {
- this.cpu.svga_mark_dirty();
- }
- else
- {
- this.diff_addr_min = 0;
- this.diff_addr_max = VGA_PIXEL_BUFFER_SIZE;
- }
- }
- else
- {
- this.text_mode_redraw();
- }
- };
- VGAScreen.prototype.complete_replot = function()
- {
- dbg_log("complete replot", LOG_VGA);
- if(!this.graphical_mode || this.svga_enabled)
- {
- return;
- }
- this.diff_plot_min = 0;
- this.diff_plot_max = VGA_PIXEL_BUFFER_SIZE;
- this.complete_redraw();
- };
- VGAScreen.prototype.partial_redraw = function(min, max)
- {
- if(min < this.diff_addr_min) this.diff_addr_min = min;
- if(max > this.diff_addr_max) this.diff_addr_max = max;
- };
- VGAScreen.prototype.partial_replot = function(min, max)
- {
- if(min < this.diff_plot_min) this.diff_plot_min = min;
- if(max > this.diff_plot_max) this.diff_plot_max = max;
- this.partial_redraw(min, max);
- };
- VGAScreen.prototype.reset_diffs = function()
- {
- this.diff_addr_min = this.vga_memory_size;
- this.diff_addr_max = 0;
- this.diff_plot_min = this.vga_memory_size;
- this.diff_plot_max = 0;
- };
- VGAScreen.prototype.destroy = function()
- {
- };
- VGAScreen.prototype.vga_bytes_per_line = function()
- {
- var bytes_per_line = this.offset_register << 2;
- if(this.underline_location_register & 0x40) bytes_per_line <<= 1;
- else if(this.crtc_mode & 0x40) bytes_per_line >>>= 1;
- return bytes_per_line;
- };
- VGAScreen.prototype.vga_addr_shift_count = function()
- {
- // Count in multiples of 0x40 for convenience
- // Left shift 2 for word mode - 2 bytes per dot clock
- var shift_count = 0x80;
- // Left shift 3 for byte mode - 1 byte per dot clock
- shift_count += ~this.underline_location_register & this.crtc_mode & 0x40;
- // Left shift 1 for doubleword mode - 4 bytes per dot clock
- shift_count -= this.underline_location_register & 0x40;
- // But shift one less if PEL width mode - 2 dot clocks per pixel
- shift_count -= this.attribute_mode & 0x40;
- return shift_count >>> 6;
- };
- VGAScreen.prototype.vga_addr_to_pixel = function(addr)
- {
- var shift_count = this.vga_addr_shift_count();
- // Undo effects of substituted bits 13 and 14
- // Assumptions:
- // - max_scan_line register is set to the values shown below
- // - Each scan line stays within the offset alignment
- // - No panning and no page flipping after drawing
- if(~this.crtc_mode & 0x3)
- {
- var pixel_addr = addr - this.start_address;
- // Remove substituted bits
- pixel_addr &= this.crtc_mode << 13 | ~0x6000;
- // Convert to 1 pixel per address
- pixel_addr <<= shift_count;
- // Decompose address
- var row = pixel_addr / this.virtual_width | 0;
- var col = pixel_addr % this.virtual_width;
- switch(this.crtc_mode & 0x3)
- {
- case 0x2:
- // Alternating rows using bit 13
- // Assumes max scan line = 1
- row = row << 1 | (addr >> 13 & 0x1);
- break;
- case 0x1:
- // Alternating rows using bit 14
- // Assumes max scan line = 3
- row = row << 1 | (addr >> 14 & 0x1);
- break;
- case 0x0:
- // Cycling through rows using bit 13 and 14
- // Assumes max scan line = 3
- row = row << 2 | (addr >> 13 & 0x3);
- break;
- }
- // Reassemble address
- return row * this.virtual_width + col + (this.start_address << shift_count);
- }
- else
- {
- // Convert to 1 pixel per address
- return addr << shift_count;
- }
- };
- VGAScreen.prototype.scan_line_to_screen_row = function(scan_line)
- {
- // Double scanning. The clock to the row scan counter is halved
- // so it is not affected by the memory address bit substitutions below
- if(this.max_scan_line & 0x80)
- {
- scan_line >>>= 1;
- }
- // Maximum scan line, aka scan lines per character row
- // This is the number of repeats - 1 for graphic modes
- var repeat_factor = 1 + (this.max_scan_line & 0x1F);
- scan_line = Math.ceil(scan_line / repeat_factor);
- // Odd and Even Row Scan Counter
- // Despite repeated address counter values, because bit 13 of the shifted
- // address is substituted with bit 0 of the row scan counter, a different
- // display buffer address is generated instead of repeated
- // Assumes maximum scan line register is set to 2 or 4.
- // Note: can't assert this as register values may not be fully programmed.
- if(!(this.crtc_mode & 0x1))
- {
- scan_line <<= 1;
- }
- // Undo effects of substituted bit 14
- // Assumes maximum scan line register is set to 2 or 4
- // Note: can't assert this as register values may not be fully programmed.
- // Other maximum scan line register values would result in weird addressing
- // anyway
- if(!(this.crtc_mode & 0x2))
- {
- scan_line <<= 1;
- }
- return scan_line;
- };
- /**
- * @param {number} cols_count
- * @param {number} rows_count
- */
- VGAScreen.prototype.set_size_text = function(cols_count, rows_count)
- {
- this.max_cols = cols_count;
- this.max_rows = rows_count;
- this.bus.send("screen-set-size-text", [cols_count, rows_count]);
- };
- VGAScreen.prototype.set_size_graphical = function(width, height, bpp, virtual_width, virtual_height)
- {
- var needs_update = !this.stats.is_graphical ||
- this.stats.bpp !== bpp ||
- this.screen_width !== width ||
- this.screen_height !== height ||
- this.virtual_width !== virtual_width ||
- this.virtual_height !== virtual_height;
- if(needs_update)
- {
- this.screen_width = width;
- this.screen_height = height;
- this.virtual_width = virtual_width;
- this.virtual_height = virtual_height;
- this.stats.bpp = bpp;
- this.stats.is_graphical = true;
- this.stats.res_x = width;
- this.stats.res_y = height;
- if (typeof ImageData !== "undefined")
- {
- const size = virtual_width * virtual_height;
- const offset = this.cpu.svga_allocate_dest_buffer(size) >>> 0;
- this.dest_buffet_offset = offset;
- this.image_data = new ImageData(new Uint8ClampedArray(this.cpu.wasm_memory.buffer, offset, 4 * size), virtual_width, virtual_height);
- this.cpu.svga_mark_dirty();
- }
- else
- {
- // TODO: nodejs
- }
- this.bus.send("screen-set-size-graphical", [width, height, virtual_width, virtual_height, bpp]);
- }
- };
- VGAScreen.prototype.update_vga_size = function()
- {
- if(this.svga_enabled)
- {
- return;
- }
- var horizontal_characters = Math.min(1 + this.horizontal_display_enable_end,
- this.horizontal_blank_start);
- var vertical_scans = Math.min(1 + this.vertical_display_enable_end,
- this.vertical_blank_start);
- if(!horizontal_characters || !vertical_scans)
- {
- // Don't update if width or height is zero.
- // These happen when registers are not fully configured yet.
- return;
- }
- if(this.graphical_mode)
- {
- var screen_width = horizontal_characters << 3;
- // Offset is half the number of bytes/words/dwords (depending on clocking mode)
- // of display memory that each logical line occupies.
- // However, the number of pixels latched, regardless of addressing mode,
- // should always 8 pixels per character clock (except for 8 bit PEL width, in which
- // case 4 pixels).
- var virtual_width = this.offset_register << 4;
- // Pixel Width / PEL Width / Clock Select
- if(this.attribute_mode & 0x40)
- {
- screen_width >>>= 1;
- virtual_width >>>= 1;
- }
- var screen_height = this.scan_line_to_screen_row(vertical_scans);
- // The virtual buffer height is however many rows of data that can fit.
- // Previously drawn graphics outside of current memory address space can
- // still be drawn by setting start_address. The address at
- // VGA_HOST_MEMORY_SPACE_START[memory_space_select] is mapped to the first
- // byte of the frame buffer. Verified on some hardware.
- // Depended on by: Windows 98 start screen
- var available_bytes = VGA_HOST_MEMORY_SPACE_SIZE[0];
- var virtual_height = Math.ceil(available_bytes / this.vga_bytes_per_line());
- this.set_size_graphical(screen_width, screen_height, 8,
- virtual_width, virtual_height);
- this.update_vertical_retrace();
- this.update_layers();
- }
- else
- {
- if(this.max_scan_line & 0x80)
- {
- // Double scanning means that half of those scan lines
- // are just repeats
- vertical_scans >>>= 1;
- }
- var height = vertical_scans / (1 + (this.max_scan_line & 0x1F)) | 0;
- if(horizontal_characters && height)
- {
- this.set_size_text(horizontal_characters, height);
- }
- }
- };
- VGAScreen.prototype.update_layers = function()
- {
- if(!this.graphical_mode)
- {
- this.text_mode_redraw();
- }
- if(this.svga_enabled)
- {
- this.layers = [];
- return;
- }
- if(!this.virtual_width || !this.screen_width)
- {
- // Avoid division by zero
- return;
- }
- if(!this.palette_source || (this.clocking_mode & 0x20))
- {
- // Palette source and screen disable bits = draw nothing
- // See http://www.phatcode.net/res/224/files/html/ch29/29-05.html#Heading6
- // and http://www.osdever.net/FreeVGA/vga/seqreg.htm#01
- this.layers = [];
- this.bus.send("screen-clear");
- return;
- }
- var start_addr = this.start_address_latched;
- var pixel_panning = this.horizontal_panning;
- if(this.attribute_mode & 0x40)
- {
- pixel_panning >>>= 1;
- }
- var byte_panning = this.preset_row_scan >> 5 & 0x3;
- var pixel_addr_start = this.vga_addr_to_pixel(start_addr + byte_panning);
- var start_buffer_row = pixel_addr_start / this.virtual_width | 0;
- var start_buffer_col = pixel_addr_start % this.virtual_width + pixel_panning;
- var split_screen_row = this.scan_line_to_screen_row(1 + this.line_compare);
- split_screen_row = Math.min(split_screen_row, this.screen_height);
- var split_buffer_height = this.screen_height - split_screen_row;
- this.layers = [];
- for(var x = -start_buffer_col, y = 0; x < this.screen_width; x += this.virtual_width, y++)
- {
- this.layers.push({
- image_data: this.image_data,
- screen_x: x,
- screen_y: 0,
- buffer_x: 0,
- buffer_y: start_buffer_row + y,
- buffer_width: this.virtual_width,
- buffer_height: split_screen_row,
- });
- }
- var start_split_col = 0;
- if(!(this.attribute_mode & 0x20))
- {
- // Pixel panning mode. Allow panning for the lower split screen
- start_split_col = this.vga_addr_to_pixel(byte_panning) + pixel_panning;
- }
- for(var x = -start_split_col, y = 0; x < this.screen_width; x += this.virtual_width, y++)
- {
- this.layers.push({
- image_data: this.image_data,
- screen_x: x,
- screen_y: split_screen_row,
- buffer_x: 0,
- buffer_y: y,
- buffer_width: this.virtual_width,
- buffer_height: split_buffer_height,
- });
- }
- };
- VGAScreen.prototype.update_vertical_retrace = function()
- {
- // Emulate behaviour during VSync/VRetrace
- this.port_3DA_value |= 0x8;
- if(this.start_address_latched !== this.start_address)
- {
- this.start_address_latched = this.start_address;
- this.update_layers();
- }
- };
- VGAScreen.prototype.update_cursor_scanline = function()
- {
- this.bus.send("screen-update-cursor-scanline", [this.cursor_scanline_start, this.cursor_scanline_end]);
- };
- /**
- * Attribute controller register / index write
- * @see {@link http://www.osdever.net/FreeVGA/vga/attrreg.htm}
- * @see {@link http://www.mcamafia.de/pdf/ibm_vgaxga_trm2.pdf} page 89
- * @see {@link https://01.org/sites/default/files/documentation/intel-gfx-prm-osrc-hsw-display_0.pdf} page 48
- */
- VGAScreen.prototype.port3C0_write = function(value)
- {
- if(this.attribute_controller_index === -1)
- {
- dbg_log("attribute controller index register: " + h(value), LOG_VGA);
- this.attribute_controller_index = value & 0x1F;
- dbg_log("attribute actual index: " + h(this.attribute_controller_index), LOG_VGA);
- if(this.palette_source !== (value & 0x20))
- {
- // A method of blanking the screen.
- // See http://www.phatcode.net/res/224/files/html/ch29/29-05.html#Heading6
- this.palette_source = value & 0x20;
- this.update_layers();
- }
- }
- else
- {
- if(this.attribute_controller_index < 0x10)
- {
- dbg_log("internal palette: " + h(this.attribute_controller_index) + " -> " + h(value), LOG_VGA);
- this.dac_map[this.attribute_controller_index] = value;
- if(!(this.attribute_mode & 0x40))
- {
- this.complete_redraw();
- }
- }
- else
- switch(this.attribute_controller_index)
- {
- case 0x10:
- dbg_log("3C0 / attribute mode control: " + h(value), LOG_VGA);
- if(this.attribute_mode !== value)
- {
- var previous_mode = this.attribute_mode;
- this.attribute_mode = value;
- var is_graphical = (value & 0x1) > 0;
- if(!this.svga_enabled && this.graphical_mode !== is_graphical)
- {
- this.graphical_mode = is_graphical;
- this.bus.send("screen-set-mode", this.graphical_mode);
- }
- if((previous_mode ^ value) & 0x40)
- {
- // PEL width changed. Pixel Buffer now invalidated
- this.complete_replot();
- }
- this.update_vga_size();
- // Data stored in image buffer are invalidated
- this.complete_redraw();
- }
- break;
- case 0x12:
- dbg_log("3C0 / color plane enable: " + h(value), LOG_VGA);
- if(this.color_plane_enable !== value)
- {
- this.color_plane_enable = value;
- // Data stored in image buffer are invalidated
- this.complete_redraw();
- }
- break;
- case 0x13:
- dbg_log("3C0 / horizontal panning: " + h(value), LOG_VGA);
- if(this.horizontal_panning !== value)
- {
- this.horizontal_panning = value & 0xF;
- this.update_layers();
- }
- break;
- case 0x14:
- dbg_log("3C0 / color select: " + h(value), LOG_VGA);
- if(this.color_select !== value)
- {
- this.color_select = value;
- // Data stored in image buffer are invalidated
- this.complete_redraw();
- }
- break;
- default:
- dbg_log("3C0 / attribute controller write " + h(this.attribute_controller_index) + ": " + h(value), LOG_VGA);
- }
- this.attribute_controller_index = -1;
- }
- };
- VGAScreen.prototype.port3C0_read = function()
- {
- dbg_log("3C0 read", LOG_VGA);
- return (this.attribute_controller_index | this.palette_source) & 0xFF;
- };
- VGAScreen.prototype.port3C0_read16 = function()
- {
- dbg_log("3C0 read16", LOG_VGA);
- return this.port3C0_read() | this.port3C1_read() << 8 & 0xFF00;
- };
- VGAScreen.prototype.port3C1_read = function()
- {
- if(this.attribute_controller_index < 0x10)
- {
- dbg_log("3C1 / internal palette read: " + h(this.attribute_controller_index) +
- " -> " + h(this.dac_map[this.attribute_controller_index]), LOG_VGA);
- return this.dac_map[this.attribute_controller_index] & 0xFF;
- }
- switch(this.attribute_controller_index)
- {
- case 0x10:
- dbg_log("3C1 / attribute mode read: " + h(this.attribute_mode), LOG_VGA);
- return this.attribute_mode;
- case 0x12:
- dbg_log("3C1 / color plane enable read: " + h(this.color_plane_enable), LOG_VGA);
- return this.color_plane_enable;
- case 0x13:
- dbg_log("3C1 / horizontal panning read: " + h(this.horizontal_panning), LOG_VGA);
- return this.horizontal_panning;
- case 0x14:
- dbg_log("3C1 / color select read: " + h(this.color_select), LOG_VGA);
- return this.color_select;
- default:
- dbg_log("3C1 / attribute controller read " + h(this.attribute_controller_index), LOG_VGA);
- }
- return 0xFF;
- };
- VGAScreen.prototype.port3C2_write = function(value)
- {
- dbg_log("3C2 / miscellaneous output register = " + h(value), LOG_VGA);
- this.miscellaneous_output_register = value;
- };
- VGAScreen.prototype.port3C4_write = function(value)
- {
- this.sequencer_index = value;
- };
- VGAScreen.prototype.port3C4_read = function()
- {
- return this.sequencer_index;
- };
- /**
- * Sequencer register writes
- * @see {@link http://www.osdever.net/FreeVGA/vga/seqreg.htm}
- * @see {@link http://www.mcamafia.de/pdf/ibm_vgaxga_trm2.pdf} page 47
- * @see {@link https://01.org/sites/default/files/documentation/intel-gfx-prm-osrc-hsw-display_0.pdf} page 19
- */
- VGAScreen.prototype.port3C5_write = function(value)
- {
- switch(this.sequencer_index)
- {
- case 0x01:
- dbg_log("clocking mode: " + h(value), LOG_VGA);
- var previous_clocking_mode = this.clocking_mode;
- this.clocking_mode = value;
- if((previous_clocking_mode ^ value) & 0x20)
- {
- // Screen disable bit modified
- this.update_layers();
- }
- break;
- case 0x02:
- dbg_log("plane write mask: " + h(value), LOG_VGA);
- this.plane_write_bm = value;
- break;
- case 0x04:
- dbg_log("sequencer memory mode: " + h(value), LOG_VGA);
- this.sequencer_memory_mode = value;
- break;
- default:
- dbg_log("3C5 / sequencer write " + h(this.sequencer_index) + ": " + h(value), LOG_VGA);
- }
- };
- VGAScreen.prototype.port3C5_read = function()
- {
- dbg_log("3C5 / sequencer read " + h(this.sequencer_index), LOG_VGA);
- switch(this.sequencer_index)
- {
- case 0x01:
- return this.clocking_mode;
- case 0x02:
- return this.plane_write_bm;
- case 0x04:
- return this.sequencer_memory_mode;
- case 0x06:
- return 0x12;
- default:
- }
- return 0;
- };
- VGAScreen.prototype.port3C6_write = function(data)
- {
- this.dac_mask = data;
- };
- VGAScreen.prototype.port3C6_read = function()
- {
- return this.dac_mask;
- };
- VGAScreen.prototype.port3C7_write = function(index)
- {
- // index for reading the DAC
- dbg_log("3C7 write: " + h(index), LOG_VGA);
- this.dac_color_index_read = index * 3;
- this.dac_state &= 0x0;
- };
- VGAScreen.prototype.port3C7_read = function()
- {
- // prepared to accept reads or writes
- return this.dac_state;
- };
- VGAScreen.prototype.port3C8_write = function(index)
- {
- this.dac_color_index_write = index * 3;
- this.dac_state |= 0x3;
- };
- VGAScreen.prototype.port3C8_read = function()
- {
- return this.dac_color_index_write / 3 & 0xFF;
- };
- /**
- * DAC color palette register writes
- * @see {@link http://www.osdever.net/FreeVGA/vga/colorreg.htm}
- * @see {@link http://www.mcamafia.de/pdf/ibm_vgaxga_trm2.pdf} page 104
- * @see {@link https://01.org/sites/default/files/documentation/intel-gfx-prm-osrc-hsw-display_0.pdf} page 57
- */
- VGAScreen.prototype.port3C9_write = function(color_byte)
- {
- var index = this.dac_color_index_write / 3 | 0,
- offset = this.dac_color_index_write % 3,
- color = this.vga256_palette[index];
- if((this.dispi_enable_value & 0x20) === 0)
- {
- color_byte &= 0x3F;
- const b = color_byte & 1;
- color_byte = color_byte << 2 | b << 1 | b;
- }
- if(offset === 0)
- {
- color = color & ~0xFF0000 | color_byte << 16;
- }
- else if(offset === 1)
- {
- color = color & ~0xFF00 | color_byte << 8;
- }
- else
- {
- color = color & ~0xFF | color_byte;
- dbg_log("dac set color, index=" + h(index) + " value=" + h(color), LOG_VGA);
- }
- if(this.vga256_palette[index] !== color)
- {
- this.vga256_palette[index] = color;
- this.complete_redraw();
- }
- this.dac_color_index_write++;
- };
- VGAScreen.prototype.port3C9_read = function()
- {
- dbg_log("3C9 read", LOG_VGA);
- var index = this.dac_color_index_read / 3 | 0;
- var offset = this.dac_color_index_read % 3;
- var color = this.vga256_palette[index];
- var color8 = color >> (2 - offset) * 8 & 0xFF;
- this.dac_color_index_read++;
- if(this.dispi_enable_value & 0x20)
- {
- return color8;
- }
- else
- {
- return color8 >> 2;
- }
- };
- VGAScreen.prototype.port3CC_read = function()
- {
- dbg_log("3CC read", LOG_VGA);
- return this.miscellaneous_output_register;
- };
- VGAScreen.prototype.port3CE_write = function(value)
- {
- this.graphics_index = value;
- };
- VGAScreen.prototype.port3CE_read = function()
- {
- return this.graphics_index;
- };
- /**
- * Graphics controller register writes
- * @see {@link http://www.osdever.net/FreeVGA/vga/graphreg.htm}
- * @see {@link http://www.mcamafia.de/pdf/ibm_vgaxga_trm2.pdf} page 78
- * @see {@link https://01.org/sites/default/files/documentation/intel-gfx-prm-osrc-hsw-display_0.pdf} page 29
- */
- VGAScreen.prototype.port3CF_write = function(value)
- {
- switch(this.graphics_index)
- {
- case 0:
- this.planar_setreset = value;
- dbg_log("plane set/reset: " + h(value), LOG_VGA);
- break;
- case 1:
- this.planar_setreset_enable = value;
- dbg_log("plane set/reset enable: " + h(value), LOG_VGA);
- break;
- case 2:
- this.color_compare = value;
- dbg_log("color compare: " + h(value), LOG_VGA);
- break;
- case 3:
- this.planar_rotate_reg = value;
- dbg_log("plane rotate: " + h(value), LOG_VGA);
- break;
- case 4:
- this.plane_read = value;
- dbg_log("plane read: " + h(value), LOG_VGA);
- break;
- case 5:
- var previous_planar_mode = this.planar_mode;
- this.planar_mode = value;
- dbg_log("planar mode: " + h(value), LOG_VGA);
- if((previous_planar_mode ^ value) & 0x60)
- {
- // Shift mode modified. Pixel buffer invalidated
- this.complete_replot();
- }
- break;
- case 6:
- dbg_log("miscellaneous graphics register: " + h(value), LOG_VGA);
- if(this.miscellaneous_graphics_register !== value)
- {
- this.miscellaneous_graphics_register = value;
- this.update_vga_size();
- }
- break;
- case 7:
- this.color_dont_care = value;
- dbg_log("color don't care: " + h(value), LOG_VGA);
- break;
- case 8:
- this.planar_bitmap = value;
- dbg_log("planar bitmap: " + h(value), LOG_VGA);
- break;
- default:
- dbg_log("3CF / graphics write " + h(this.graphics_index) + ": " + h(value), LOG_VGA);
- }
- };
- VGAScreen.prototype.port3CF_read = function()
- {
- dbg_log("3CF / graphics read " + h(this.graphics_index), LOG_VGA);
- switch(this.graphics_index)
- {
- case 0:
- return this.planar_setreset;
- case 1:
- return this.planar_setreset_enable;
- case 2:
- return this.color_compare;
- case 3:
- return this.planar_rotate_reg;
- case 4:
- return this.plane_read;
- case 5:
- return this.planar_mode;
- case 6:
- return this.miscellaneous_graphics_register;
- case 7:
- return this.color_dont_care;
- case 8:
- return this.planar_bitmap;
- default:
- }
- return 0;
- };
- VGAScreen.prototype.port3D4_write = function(register)
- {
- dbg_log("3D4 / crtc index: " + register, LOG_VGA);
- this.index_crtc = register;
- };
- VGAScreen.prototype.port3D4_read = function()
- {
- dbg_log("3D4 read / crtc index: " + this.index_crtc, LOG_VGA);
- return this.index_crtc;
- };
- /**
- * CRT controller register writes
- * @see {@link http://www.osdever.net/FreeVGA/vga/crtcreg.htm}
- * @see {@link http://www.mcamafia.de/pdf/ibm_vgaxga_trm2.pdf} page 55
- * @see {@link https://01.org/sites/default/files/documentation/intel-gfx-prm-osrc-hsw-display_0.pdf} page 63
- */
- VGAScreen.prototype.port3D5_write = function(value)
- {
- switch(this.index_crtc)
- {
- case 0x1:
- dbg_log("3D5 / hdisp enable end write: " + h(value), LOG_VGA);
- if(this.horizontal_display_enable_end !== value)
- {
- this.horizontal_display_enable_end = value;
- this.update_vga_size();
- }
- break;
- case 0x2:
- if(this.horizontal_blank_start !== value)
- {
- this.horizontal_blank_start = value;
- this.update_vga_size();
- }
- break;
- case 0x7:
- dbg_log("3D5 / overflow register write: " + h(value), LOG_VGA);
- var previous_vertical_display_enable_end = this.vertical_display_enable_end;
- this.vertical_display_enable_end &= 0xFF;
- this.vertical_display_enable_end |= (value << 3 & 0x200) | (value << 7 & 0x100);
- if(previous_vertical_display_enable_end != this.vertical_display_enable_end)
- {
- this.update_vga_size();
- }
- this.line_compare = (this.line_compare & 0x2FF) | (value << 4 & 0x100);
- var previous_vertical_blank_start = this.vertical_blank_start;
- this.vertical_blank_start = (this.vertical_blank_start & 0x2FF) | (value << 5 & 0x100);
- if(previous_vertical_blank_start !== this.vertical_blank_start)
- {
- this.update_vga_size();
- }
- this.update_layers();
- break;
- case 0x8:
- dbg_log("3D5 / preset row scan write: " + h(value), LOG_VGA);
- this.preset_row_scan = value;
- this.update_layers();
- break;
- case 0x9:
- dbg_log("3D5 / max scan line write: " + h(value), LOG_VGA);
- this.max_scan_line = value;
- this.line_compare = (this.line_compare & 0x1FF) | (value << 3 & 0x200);
- var previous_vertical_blank_start = this.vertical_blank_start;
- this.vertical_blank_start = (this.vertical_blank_start & 0x1FF) | (value << 4 & 0x200);
- if(previous_vertical_blank_start !== this.vertical_blank_start)
- {
- this.update_vga_size();
- }
- this.update_layers();
- break;
- case 0xA:
- dbg_log("3D5 / cursor scanline start write: " + h(value), LOG_VGA);
- this.cursor_scanline_start = value;
- this.update_cursor_scanline();
- break;
- case 0xB:
- dbg_log("3D5 / cursor scanline end write: " + h(value), LOG_VGA);
- this.cursor_scanline_end = value;
- this.update_cursor_scanline();
- break;
- case 0xC:
- if((this.start_address >> 8 & 0xFF) !== value)
- {
- this.start_address = this.start_address & 0xff | value << 8;
- this.update_layers();
- if(~this.crtc_mode & 0x3)
- {
- // Address substitution implementation depends on the
- // starting row and column, so the pixel buffer is invalidated.
- this.complete_replot();
- }
- }
- dbg_log("3D5 / start addr hi write: " + h(value) + " -> " + h(this.start_address, 4), LOG_VGA);
- break;
- case 0xD:
- if((this.start_address & 0xFF) !== value)
- {
- this.start_address = this.start_address & 0xff00 | value;
- this.update_layers();
- if(~this.crtc_mode & 0x3)
- {
- // Address substitution implementation depends on the
- // starting row and column, so the pixel buffer is invalidated.
- this.complete_replot();
- }
- }
- dbg_log("3D5 / start addr lo write: " + h(value) + " -> " + h(this.start_address, 4), LOG_VGA);
- break;
- case 0xE:
- dbg_log("3D5 / cursor address hi write: " + h(value), LOG_VGA);
- this.cursor_address = this.cursor_address & 0xFF | value << 8;
- this.update_cursor();
- break;
- case 0xF:
- dbg_log("3D5 / cursor address lo write: " + h(value), LOG_VGA);
- this.cursor_address = this.cursor_address & 0xFF00 | value;
- this.update_cursor();
- break;
- case 0x12:
- dbg_log("3D5 / vdisp enable end write: " + h(value), LOG_VGA);
- if((this.vertical_display_enable_end & 0xFF) !== value)
- {
- this.vertical_display_enable_end = (this.vertical_display_enable_end & 0x300) | value;
- this.update_vga_size();
- }
- break;
- case 0x13:
- dbg_log("3D5 / offset register write: " + h(value), LOG_VGA);
- if(this.offset_register !== value)
- {
- this.offset_register = value;
- this.update_vga_size();
- if(~this.crtc_mode & 0x3)
- {
- // Address substitution implementation depends on the
- // virtual width, so the pixel buffer is invalidated.
- this.complete_replot();
- }
- }
- break;
- case 0x14:
- dbg_log("3D5 / underline location write: " + h(value), LOG_VGA);
- if(this.underline_location_register !== value)
- {
- var previous_underline = this.underline_location_register;
- this.underline_location_register = value;
- this.update_vga_size();
- if((previous_underline ^ value) & 0x40)
- {
- // Doubleword addressing changed. Pixel buffer invalidated.
- this.complete_replot();
- }
- }
- break;
- case 0x15:
- dbg_log("3D5 / vertical blank start write: " + h(value), LOG_VGA);
- if((this.vertical_blank_start & 0xFF) !== value)
- {
- this.vertical_blank_start = (this.vertical_blank_start & 0x300) | value;
- this.update_vga_size();
- }
- break;
- case 0x17:
- dbg_log("3D5 / crtc mode write: " + h(value), LOG_VGA);
- if(this.crtc_mode !== value)
- {
- var previous_mode = this.crtc_mode;
- this.crtc_mode = value;
- this.update_vga_size();
- if((previous_mode ^ value) & 0x43)
- {
- // Word/byte addressing changed or address substitution changed.
- // Pixel buffer invalidated.
- this.complete_replot();
- }
- }
- break;
- case 0x18:
- dbg_log("3D5 / line compare write: " + h(value), LOG_VGA);
- this.line_compare = (this.line_compare & 0x300) | value;
- this.update_layers();
- break;
- default:
- if(this.index_crtc < this.crtc.length)
- {
- this.crtc[this.index_crtc] = value;
- }
- dbg_log("3D5 / CRTC write " + h(this.index_crtc) + ": " + h(value), LOG_VGA);
- }
- };
- VGAScreen.prototype.port3D5_read = function()
- {
- dbg_log("3D5 read " + h(this.index_crtc), LOG_VGA);
- switch(this.index_crtc)
- {
- case 0x1:
- return this.horizontal_display_enable_end;
- case 0x2:
- return this.horizontal_blank_start;
- case 0x7:
- return (this.vertical_display_enable_end >> 7 & 0x2) |
- (this.vertical_blank_start >> 5 & 0x8) |
- (this.line_compare >> 4 & 0x10) |
- (this.vertical_display_enable_end >> 3 & 0x40);
- case 0x8:
- return this.preset_row_scan;
- case 0x9:
- return this.max_scan_line;
- case 0xA:
- return this.cursor_scanline_start;
- case 0xB:
- return this.cursor_scanline_end;
- case 0xC:
- return this.start_address & 0xFF;
- case 0xD:
- return this.start_address >> 8;
- case 0xE:
- return this.cursor_address >> 8;
- case 0xF:
- return this.cursor_address & 0xFF;
- case 0x12:
- return this.vertical_display_enable_end & 0xFF;
- case 0x13:
- return this.offset_register;
- case 0x14:
- return this.underline_location_register;
- case 0x15:
- return this.vertical_blank_start & 0xFF;
- case 0x17:
- return this.crtc_mode;
- case 0x18:
- return this.line_compare & 0xFF;
- }
- if(this.index_crtc < this.crtc.length)
- {
- return this.crtc[this.index_crtc];
- }
- else
- {
- return 0;
- }
- };
- VGAScreen.prototype.port3DA_read = function()
- {
- dbg_log("3DA read - status 1 and clear attr index", LOG_VGA);
- var value = this.port_3DA_value;
- // Status register, bit 3 set by update_vertical_retrace
- // during screen-fill-buffer
- if(!this.graphical_mode)
- {
- // But screen-fill-buffer may not get triggered in text mode
- // so toggle it manually here
- if(this.port_3DA_value & 1)
- {
- this.port_3DA_value ^= 8;
- }
- this.port_3DA_value ^= 1;
- }
- else
- {
- this.port_3DA_value ^= 1;
- this.port_3DA_value &= 1;
- }
- this.attribute_controller_index = -1;
- return value;
- };
- VGAScreen.prototype.port1CE_write = function(value)
- {
- this.dispi_index = value;
- };
- VGAScreen.prototype.port1CF_write = function(value)
- {
- dbg_log("1CF / dispi write " + h(this.dispi_index) + ": " + h(value), LOG_VGA);
- switch(this.dispi_index)
- {
- case 0:
- if(value >= 0xB0C0 && value <= 0xB0C5)
- {
- this.svga_version = value;
- }
- else
- {
- dbg_log("Invalid version value: " + h(value), LOG_VGA);
- }
- break;
- case 1:
- this.svga_width = value;
- if(this.svga_width > MAX_XRES)
- {
- dbg_log("svga_width reduced from " + this.svga_width + " to " + MAX_XRES, LOG_VGA);
- this.svga_width = MAX_XRES;
- }
- break;
- case 2:
- this.svga_height = value;
- if(this.svga_height > MAX_YRES)
- {
- dbg_log("svga_height reduced from " + this.svga_height + " to " + MAX_YRES, LOG_VGA);
- this.svga_height = MAX_YRES;
- }
- break;
- case 3:
- this.svga_bpp = value;
- break;
- case 4:
- // enable, options
- this.svga_enabled = (value & 1) === 1;
- this.dispi_enable_value = value;
- break;
- case 5:
- dbg_log("SVGA bank offset: " + h(value << 16), LOG_VGA);
- this.svga_bank_offset = value << 16;
- break;
- case 9:
- // y offset
- const offset = value * this.svga_width;
- dbg_log("SVGA offset: " + h(offset) + " y=" + h(value), LOG_VGA);
- if(this.svga_offset_y !== value)
- {
- this.svga_offset_y = value;
- this.svga_offset = offset;
- this.complete_redraw();
- }
- break;
- default:
- dbg_log("Unimplemented dispi write index: " + h(this.dispi_index), LOG_VGA);
- }
- if(this.svga_enabled && (!this.svga_width || !this.svga_height))
- {
- dbg_log("SVGA: disabled because of invalid width/height: " + this.svga_width + "x" + this.svga_height, LOG_VGA);
- this.svga_enabled = false;
- }
- dbg_assert(this.svga_bpp !== 4, "unimplemented svga bpp: 4");
- dbg_assert(this.svga_bpp === 4 || this.svga_bpp === 8 ||
- this.svga_bpp === 15 || this.svga_bpp === 16 ||
- this.svga_bpp === 24 || this.svga_bpp === 32,
- "unexpected svga bpp: " + this.svga_bpp);
- dbg_log("SVGA: enabled=" + this.svga_enabled + ", " + this.svga_width + "x" + this.svga_height + "x" + this.svga_bpp, LOG_VGA);
- if(this.svga_enabled && this.dispi_index === 4)
- {
- this.set_size_graphical(this.svga_width, this.svga_height, this.svga_bpp, this.svga_width, this.svga_height);
- this.bus.send("screen-set-mode", true);
- this.graphical_mode = true;
- this.graphical_mode_is_linear = true;
- }
- if(!this.svga_enabled)
- {
- this.svga_bank_offset = 0;
- }
- this.update_layers();
- };
- VGAScreen.prototype.port1CF_read = function()
- {
- dbg_log("1CF / dispi read " + h(this.dispi_index), LOG_VGA);
- return this.svga_register_read(this.dispi_index);
- };
- VGAScreen.prototype.svga_register_read = function(n)
- {
- switch(n)
- {
- case 0:
- return this.svga_version;
- case 1:
- return this.dispi_enable_value & 2 ? MAX_XRES : this.svga_width;
- case 2:
- return this.dispi_enable_value & 2 ? MAX_YRES : this.svga_height;
- case 3:
- return this.dispi_enable_value & 2 ? MAX_BPP : this.svga_bpp;
- case 4:
- return this.dispi_enable_value;
- case 5:
- return this.svga_bank_offset >>> 16;
- case 6:
- // virtual width
- if(this.screen_width)
- {
- return this.screen_width;
- }
- else
- {
- return 1; // seabios/windows98 divide exception
- }
- break;
- case 8:
- // x offset
- return 0;
- case 9:
- return this.svga_offset_y;
- case 0x0A:
- // memory size in 64 kilobyte banks
- return this.vga_memory_size / VGA_BANK_SIZE | 0;
- default:
- dbg_log("Unimplemented dispi read index: " + h(this.dispi_index), LOG_VGA);
- }
- return 0xFF;
- };
- /**
- * Transfers graphics from VGA Planes to the Pixel Buffer
- * VGA Planes represent data stored on actual hardware.
- * Pixel Buffer caches the 4-bit or 8-bit color indices for each pixel.
- */
- VGAScreen.prototype.vga_replot = function()
- {
- // Round to multiple of 8 towards extreme
- var start = this.diff_plot_min & ~0xF;
- var end = Math.min((this.diff_plot_max | 0xF), VGA_PIXEL_BUFFER_SIZE - 1);
- var addr_shift = this.vga_addr_shift_count();
- var addr_substitution = ~this.crtc_mode & 0x3;
- var shift_mode = this.planar_mode & 0x60;
- var pel_width = this.attribute_mode & 0x40;
- for(var pixel_addr = start; pixel_addr <= end;)
- {
- var addr = pixel_addr >>> addr_shift;
- if(addr_substitution)
- {
- var row = pixel_addr / this.virtual_width | 0;
- var col = pixel_addr - this.virtual_width * row;
- switch(addr_substitution)
- {
- case 0x1:
- // Alternating rows using bit 13
- // Assumes max scan line = 1
- addr = (row & 0x1) << 13;
- row >>>= 1;
- break;
- case 0x2:
- // Alternating rows using bit 14
- // Assumes max scan line = 3
- addr = (row & 0x1) << 14;
- row >>>= 1;
- break;
- case 0x3:
- // Cycling through rows using bit 13 and 14
- // Assumes max scan line = 3
- addr = (row & 0x3) << 13;
- row >>>= 2;
- break;
- }
- addr |= (row * this.virtual_width + col >>> addr_shift) + this.start_address;
- }
- var byte0 = this.plane0[addr];
- var byte1 = this.plane1[addr];
- var byte2 = this.plane2[addr];
- var byte3 = this.plane3[addr];
- var shift_loads = new Uint8Array(8);
- switch(shift_mode)
- {
- // Planar Shift Mode
- // See http://www.osdever.net/FreeVGA/vga/vgaseq.htm
- case 0x00:
- // Shift these, so that the bits for the color are in
- // the correct position in the for loop
- byte0 <<= 0;
- byte1 <<= 1;
- byte2 <<= 2;
- byte3 <<= 3;
- for(var i = 7; i >= 0; i--)
- {
- shift_loads[7 - i] =
- byte0 >> i & 1 |
- byte1 >> i & 2 |
- byte2 >> i & 4 |
- byte3 >> i & 8;
- }
- break;
- // Packed Shift Mode, aka Interleaved Shift Mode
- // Video Modes 4h and 5h
- case 0x20:
- shift_loads[0] = (byte0 >> 6 & 0x3) | (byte2 >> 4 & 0xC);
- shift_loads[1] = (byte0 >> 4 & 0x3) | (byte2 >> 2 & 0xC);
- shift_loads[2] = (byte0 >> 2 & 0x3) | (byte2 >> 0 & 0xC);
- shift_loads[3] = (byte0 >> 0 & 0x3) | (byte2 << 2 & 0xC);
- shift_loads[4] = (byte1 >> 6 & 0x3) | (byte3 >> 4 & 0xC);
- shift_loads[5] = (byte1 >> 4 & 0x3) | (byte3 >> 2 & 0xC);
- shift_loads[6] = (byte1 >> 2 & 0x3) | (byte3 >> 0 & 0xC);
- shift_loads[7] = (byte1 >> 0 & 0x3) | (byte3 << 2 & 0xC);
- break;
- // 256-Color Shift Mode
- // Video Modes 13h and unchained 256 color
- case 0x40:
- case 0x60:
- shift_loads[0] = byte0 >> 4 & 0xF;
- shift_loads[1] = byte0 >> 0 & 0xF;
- shift_loads[2] = byte1 >> 4 & 0xF;
- shift_loads[3] = byte1 >> 0 & 0xF;
- shift_loads[4] = byte2 >> 4 & 0xF;
- shift_loads[5] = byte2 >> 0 & 0xF;
- shift_loads[6] = byte3 >> 4 & 0xF;
- shift_loads[7] = byte3 >> 0 & 0xF;
- break;
- }
- if(pel_width)
- {
- // Assemble from two sets of 4 bits.
- for(var i = 0, j = 0; i < 4; i++, pixel_addr++, j += 2)
- {
- this.pixel_buffer[pixel_addr] = (shift_loads[j] << 4) | shift_loads[j + 1];
- }
- }
- else
- {
- for(var i = 0; i < 8; i++, pixel_addr++)
- {
- this.pixel_buffer[pixel_addr] = shift_loads[i];
- }
- }
- }
- };
- /**
- * Transfers graphics from Pixel Buffer to Destination Image Buffer.
- * The 4-bit/8-bit color indices in the Pixel Buffer are passed through
- * the internal palette (dac_map) and the DAC palette (vga256_palette) to
- * obtain the final 32 bit color that the Canvas API uses.
- */
- VGAScreen.prototype.vga_redraw = function()
- {
- var start = this.diff_addr_min;
- var end = Math.min(this.diff_addr_max, VGA_PIXEL_BUFFER_SIZE - 1);
- const buffer = new Int32Array(this.cpu.wasm_memory.buffer, this.dest_buffet_offset, this.virtual_width * this.virtual_height);
- var mask = 0xFF;
- var colorset = 0x00;
- if(this.attribute_mode & 0x80)
- {
- // Palette bits 5/4 select
- mask &= 0xCF;
- colorset |= this.color_select << 4 & 0x30;
- }
- if(this.attribute_mode & 0x40)
- {
- // 8 bit mode
- for(var pixel_addr = start; pixel_addr <= end; pixel_addr++)
- {
- var color256 = (this.pixel_buffer[pixel_addr] & mask) | colorset;
- var color = this.vga256_palette[color256];
- buffer[pixel_addr] = color & 0xFF00 | color << 16 | color >> 16 | 0xFF000000;
- }
- }
- else
- {
- // 4 bit mode
- // Palette bits 7/6 select
- mask &= 0x3F;
- colorset |= this.color_select << 4 & 0xC0;
- for(var pixel_addr = start; pixel_addr <= end; pixel_addr++)
- {
- var color16 = this.pixel_buffer[pixel_addr] & this.color_plane_enable;
- var color256 = (this.dac_map[color16] & mask) | colorset;
- var color = this.vga256_palette[color256];
- buffer[pixel_addr] = color & 0xFF00 | color << 16 | color >> 16 | 0xFF000000;
- }
- }
- };
- VGAScreen.prototype.screen_fill_buffer = function()
- {
- if(!this.graphical_mode)
- {
- // text mode
- // Update retrace behaviour anyway - programs waiting for signal before
- // changing to graphical mode
- this.update_vertical_retrace();
- return;
- }
- if(this.image_data.data.byteLength === 0)
- {
- // wasm memory resized
- const buffer = new Uint8ClampedArray(this.cpu.wasm_memory.buffer, this.dest_buffet_offset, 4 * this.virtual_width * this.virtual_height);
- this.image_data = new ImageData(buffer, this.virtual_width, this.virtual_height);
- this.update_layers();
- }
- if(this.svga_enabled)
- {
- let min_y = 0;
- let max_y = this.svga_height;
- if(this.svga_bpp === 8)
- {
- // XXX: Slow, should be ported to rust, but it doesn't have access to vga256_palette
- // XXX: Doesn't take svga_offset into account
- const buffer = new Int32Array(this.cpu.wasm_memory.buffer, this.dest_buffet_offset, this.screen_width * this.screen_height);
- const svga_memory = new Uint8Array(this.cpu.wasm_memory.buffer, this.svga_memory.byteOffset, this.vga_memory_size);
- for(var i = 0; i < buffer.length; i++)
- {
- var color = this.vga256_palette[svga_memory[i]];
- buffer[i] = color & 0xFF00 | color << 16 | color >> 16 | 0xFF000000;
- }
- }
- else
- {
- this.cpu.svga_fill_pixel_buffer(this.svga_bpp, this.svga_offset);
- const bytes_per_pixel = this.svga_bpp === 15 ? 2 : this.svga_bpp / 8;
- min_y = (((this.cpu.svga_dirty_bitmap_min_offset[0] / bytes_per_pixel | 0) - this.svga_offset) / this.svga_width | 0);
- max_y = (((this.cpu.svga_dirty_bitmap_max_offset[0] / bytes_per_pixel | 0) - this.svga_offset) / this.svga_width | 0) + 1;
- }
- if(min_y < max_y)
- {
- min_y = Math.max(min_y, 0);
- max_y = Math.min(max_y, this.svga_height);
- this.bus.send("screen-fill-buffer-end", [{
- image_data: this.image_data,
- screen_x: 0, screen_y: min_y,
- buffer_x: 0, buffer_y: min_y,
- buffer_width: this.svga_width,
- buffer_height: max_y - min_y,
- }]);
- }
- }
- else
- {
- this.vga_replot();
- this.vga_redraw();
- this.bus.send("screen-fill-buffer-end", this.layers);
- }
- this.reset_diffs();
- this.update_vertical_retrace();
- };
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