diff --git a/src/configurations.rs b/src/configurations.rs index bd35e1d..1c1b898 100644 --- a/src/configurations.rs +++ b/src/configurations.rs @@ -316,7 +316,7 @@ pub const MODE_640X480X16_CONFIGURATION: VgaConfiguration = VgaConfiguration { ], }; -/// Register values for Vga mode 640x480x16 Graphics. +/// Register values for Vga mode 320x200x256 Graphics. pub const MODE_320X200X256_CONFIGURATION: VgaConfiguration = VgaConfiguration { // Configuration values acquired from https://www.singlix.com/trdos/archive/vga/Graphics%20in%20pmode.pdf miscellaneous_output: 0x63, @@ -389,3 +389,77 @@ pub const MODE_320X200X256_CONFIGURATION: VgaConfiguration = VgaConfiguration { (AttributeControllerIndex::ColorSelect, 0x00), ], }; + +/// Register values for Vga mode 320x200x256x Graphics. +pub const MODE_320X240X256_CONFIGURATION: VgaConfiguration = VgaConfiguration { + // Configuration values acquired from https://www.singlix.com/trdos/archive/vga/Graphics%20in%20pmode.pdf + miscellaneous_output: 0x63, + sequencer_registers: &[ + (SequencerIndex::SequencerReset, 0x03), + (SequencerIndex::ClockingMode, 0x01), + (SequencerIndex::PlaneMask, 0x0F), + (SequencerIndex::CharacterFont, 0x00), + (SequencerIndex::MemoryMode, 0x06), + ], + crtc_controller_registers: &[ + (CrtcControllerIndex::HorizontalTotal, 0x5F), + (CrtcControllerIndex::HorizontalDisplayEnableEnd, 0x4F), + (CrtcControllerIndex::HorizontalBlankingStart, 0x50), + (CrtcControllerIndex::HorizontalBlankingEnd, 0x82), + (CrtcControllerIndex::HorizontalSyncStart, 0x54), + (CrtcControllerIndex::HorizontalSyncEnd, 0x80), + (CrtcControllerIndex::VeritcalTotal, 0xBF), + (CrtcControllerIndex::Overflow, 0x1F), + (CrtcControllerIndex::PresetRowScan, 0x00), + (CrtcControllerIndex::MaximumScanLine, 0x41), + (CrtcControllerIndex::TextCursorStart, 0x00), + (CrtcControllerIndex::TextCursorEnd, 0x00), + (CrtcControllerIndex::StartAddressHigh, 0x00), + (CrtcControllerIndex::StartAddressLow, 0x00), + (CrtcControllerIndex::TextCursorLocationHigh, 0x00), + (CrtcControllerIndex::TextCursorLocationLow, 0x00), + (CrtcControllerIndex::VerticalSyncStart, 0x9C), + (CrtcControllerIndex::VerticalSyncEnd, 0x0E), + (CrtcControllerIndex::VerticalDisplayEnableEnd, 0x8F), + (CrtcControllerIndex::Offset, 0x28), + (CrtcControllerIndex::UnderlineLocation, 0x00), + (CrtcControllerIndex::VerticalBlankingStart, 0x96), + (CrtcControllerIndex::VerticalBlankingEnd, 0xB9), + (CrtcControllerIndex::ModeControl, 0xe3), + (CrtcControllerIndex::LineCompare, 0xFF), + ], + graphics_controller_registers: &[ + (GraphicsControllerIndex::SetReset, 0x00), + (GraphicsControllerIndex::EnableSetReset, 0x00), + (GraphicsControllerIndex::ColorCompare, 0x00), + (GraphicsControllerIndex::DataRotate, 0x00), + (GraphicsControllerIndex::ReadPlaneSelect, 0x00), + (GraphicsControllerIndex::GraphicsMode, 0x40), + (GraphicsControllerIndex::Miscellaneous, 0x05), + (GraphicsControllerIndex::ColorDontCare, 0x0F), + (GraphicsControllerIndex::BitMask, 0xFF), + ], + attribute_controller_registers: &[ + (AttributeControllerIndex::PaletteRegister0, 0x00), + (AttributeControllerIndex::PaletteRegister1, 0x01), + (AttributeControllerIndex::PaletteRegister2, 0x02), + (AttributeControllerIndex::PaletteRegister3, 0x03), + (AttributeControllerIndex::PaletteRegister4, 0x04), + (AttributeControllerIndex::PaletteRegister5, 0x05), + (AttributeControllerIndex::PaletteRegister6, 0x06), + (AttributeControllerIndex::PaletteRegister7, 0x07), + (AttributeControllerIndex::PaletteRegister8, 0x08), + (AttributeControllerIndex::PaletteRegister9, 0x09), + (AttributeControllerIndex::PaletteRegisterA, 0x0A), + (AttributeControllerIndex::PaletteRegisterB, 0x0B), + (AttributeControllerIndex::PaletteRegisterC, 0x0C), + (AttributeControllerIndex::PaletteRegisterD, 0x0D), + (AttributeControllerIndex::PaletteRegisterE, 0x0E), + (AttributeControllerIndex::PaletteRegisterF, 0x0F), + (AttributeControllerIndex::ModeControl, 0x41), + (AttributeControllerIndex::OverscanColor, 0x00), + (AttributeControllerIndex::MemoryPlaneEnable, 0x0F), + (AttributeControllerIndex::HorizontalPixelPanning, 0x00), + (AttributeControllerIndex::ColorSelect, 0x00), + ], +}; diff --git a/src/registers/sequencer.rs b/src/registers/sequencer.rs index a161929..d7dfe61 100644 --- a/src/registers/sequencer.rs +++ b/src/registers/sequencer.rs @@ -96,7 +96,7 @@ impl SequencerRegisters { /// Sets the plane mask of the sequencer controller, as specified by `plane_mask`. pub fn set_plane_mask(&mut self, plane_mask: PlaneMask) { - let original_value = self.read(SequencerIndex::PlaneMask); + let original_value = self.read(SequencerIndex::PlaneMask) & 0xF0; self.write( SequencerIndex::PlaneMask, original_value | u8::from(plane_mask), diff --git a/src/vga.rs b/src/vga.rs index 79d70e0..581222d 100644 --- a/src/vga.rs +++ b/src/vga.rs @@ -2,8 +2,9 @@ use super::{ configurations::{ - VgaConfiguration, MODE_320X200X256_CONFIGURATION, MODE_40X25_CONFIGURATION, - MODE_40X50_CONFIGURATION, MODE_640X480X16_CONFIGURATION, MODE_80X25_CONFIGURATION, + VgaConfiguration, MODE_320X200X256_CONFIGURATION, MODE_320X240X256_CONFIGURATION, + MODE_40X25_CONFIGURATION, MODE_40X50_CONFIGURATION, MODE_640X480X16_CONFIGURATION, + MODE_80X25_CONFIGURATION, }, fonts::VgaFont, registers::{ @@ -59,6 +60,8 @@ pub enum VideoMode { Mode80x25, /// Represents graphics mode 320x200x256. Mode320x200x256, + /// Represents graphics mode 320x240x256. + Mode320x240x256, /// Represents graphics mode 640x480x16. Mode640x480x16, } @@ -101,6 +104,7 @@ impl Vga { VideoMode::Mode40x50 => self.set_video_mode_40x50(), VideoMode::Mode80x25 => self.set_video_mode_80x25(), VideoMode::Mode320x200x256 => self.set_video_mode_320x200x256(), + VideoMode::Mode320x240x256 => self.set_video_mode_320x240x256(), VideoMode::Mode640x480x16 => self.set_video_mode_640x480x16(), } } @@ -275,6 +279,12 @@ impl Vga { self.most_recent_video_mode = Some(VideoMode::Mode320x200x256); } + /// Sets the video card to Mode 320x200x256x. + fn set_video_mode_320x240x256(&mut self) { + self.set_registers(&MODE_320X240X256_CONFIGURATION); + self.most_recent_video_mode = Some(VideoMode::Mode320x240x256); + } + /// Sets the video card to Mode 640x480x16. fn set_video_mode_640x480x16(&mut self) { self.set_registers(&MODE_640X480X16_CONFIGURATION); diff --git a/src/writers/graphics_320x240x256.rs b/src/writers/graphics_320x240x256.rs new file mode 100644 index 0000000..fbaaad2 --- /dev/null +++ b/src/writers/graphics_320x240x256.rs @@ -0,0 +1,85 @@ +use super::{GraphicsWriter, Screen}; +use crate::{ + colors::DEFAULT_PALETTE, + drawing::{Bresenham, Point}, + registers::PlaneMask, + vga::{Vga, VideoMode, VGA}, +}; +use font8x8::UnicodeFonts; +use spinning_top::SpinlockGuard; + +const WIDTH: usize = 320; +const HEIGHT: usize = 200; +const SIZE: usize = (WIDTH * HEIGHT) / 4; + +#[derive(Debug, Clone, Copy, Default)] +pub struct Graphics320x240x256; + +impl Screen for Graphics320x240x256 { + const WIDTH: usize = WIDTH; + const HEIGHT: usize = HEIGHT; + const SIZE: usize = SIZE; +} + +impl GraphicsWriter for Graphics320x240x256 { + fn clear_screen(&self, color: u8) { + let (_vga, frame_buffer) = self.get_frame_buffer(); + unsafe { + frame_buffer.write_bytes(color, Self::SIZE); + } + } + fn draw_line(&self, start: Point, end: Point, color: u8) { + for (x, y) in Bresenham::new(start, end) { + self.set_pixel(x as usize, y as usize, color); + } + } + fn set_pixel(&self, x: usize, y: usize, color: u8) { + let (mut vga, frame_buffer) = self.get_frame_buffer(); + unsafe { + let offset = (WIDTH * y + x) / 4; + let plane_mask = 0x1 << (x & 3); + vga.sequencer_registers + .set_plane_mask(PlaneMask::from_bits(plane_mask).unwrap()); + frame_buffer.add(offset).write_volatile(color); + } + } + fn draw_character(&self, x: usize, y: usize, character: char, color: u8) { + let character = match font8x8::BASIC_FONTS.get(character) { + Some(character) => character, + // Default to a filled block if the character isn't found + None => font8x8::unicode::BLOCK_UNICODE[8].byte_array(), + }; + + for (row, byte) in character.iter().enumerate() { + for bit in 0..8 { + match *byte & 1 << bit { + 0 => (), + _ => self.set_pixel(x + bit, y + row, color), + } + } + } + } + fn set_mode(&self) { + let mut vga = VGA.lock(); + vga.set_video_mode(VideoMode::Mode320x240x256); + + // Some bios mess up the palette when switching modes, + // so explicitly set it. + vga.color_palette_registers.load_palette(&DEFAULT_PALETTE); + } +} + +impl Graphics320x240x256 { + pub const fn new() -> Graphics320x240x256 { + Graphics320x240x256 + } + + /// Returns the start of the `FrameBuffer` as `*mut u8` as + /// well as a lock to the vga driver. This ensures the vga + /// driver stays locked while the frame buffer is in use. + fn get_frame_buffer(self) -> (SpinlockGuard<'static, Vga>, *mut u8) { + let mut vga = VGA.lock(); + let frame_buffer = vga.get_frame_buffer(); + (vga, u32::from(frame_buffer) as *mut u8) + } +} diff --git a/src/writers/mod.rs b/src/writers/mod.rs index d47a2a8..3d83742 100644 --- a/src/writers/mod.rs +++ b/src/writers/mod.rs @@ -1,5 +1,6 @@ //! Writers for common vga modes. mod graphics_320x200x256; +mod graphics_320x240x256; mod graphics_640x480x16; mod text_40x25; mod text_40x50; @@ -14,6 +15,7 @@ use super::{ use spinning_top::SpinlockGuard; pub use graphics_320x200x256::Graphics320x200x256; +pub use graphics_320x240x256::Graphics320x240x256; pub use graphics_640x480x16::Graphics640x480x16; pub use text_40x25::Text40x25; pub use text_40x50::Text40x50;