MaxOS::drivers::video::VideoElectronicsStandardsAssociation Class Reference

Driver for the VESA video controller, handles the rendering of pixels to the screen using VESA. More...

#include <vesa.h>

Inheritance diagram for MaxOS::drivers::video::VideoElectronicsStandardsAssociation:

Public Member Functions
	VideoElectronicsStandardsAssociation (multiboot_tag_framebuffer *framebuffer_info)
	Constructs a new VESA driver object. Maps the framebuffer into the higher half.
bool	supports_mode (uint32_t width, uint32_t height, uint32_t) final
	Checks if the VESA driver supports the given mode.
string	vendor_name () final
	The name of the vendor of the VESA standard.
string	device_name () final
	The name of the device.
Public Member Functions inherited from MaxOS::drivers::video::VideoDriver
bool	set_mode (uint32_t width, uint32_t height, uint32_t color_depth)
	Set the mode of the video driver.
Public Member Functions inherited from MaxOS::drivers::Driver
virtual void	activate ()
	Activate the driver.
virtual void	deactivate ()
	Deactivate the driver.
virtual void	initialise ()
	Initialise the driver.
virtual uint32_t	reset ()
	Reset the driver.
Public Member Functions inherited from MaxOS::common::GraphicsContext
	GraphicsContext ()
	Constructs a GraphicsContext object and initializes the color palette.
uint32_t	colour_to_int (const Colour &)
	Converts a colour to an integer value based on the current color depth.
Colour	int_to_colour (uint32_t)
	Converts an integer value to a colour based on the current color depth.
uint32_t	width () const
	Gets the width of the screen.
uint32_t	height () const
	Gets the height of the screen.
uint32_t	color_depth () const
	Gets the current color depth (bits per pixel)
uint64_t *	framebuffer_address ()
	Gets the address of the context's framebuffer to draw on.
void	put_pixel (uint32_t x, uint32_t y, const Colour &colour)
	Renders a pixel to the screen (automatically converts the colour to an integer)
void	put_pixel (uint32_t x, uint32_t y, uint32_t colour)
	Renders a pixel to the screen (automatically converts the colour to an integer), will not render the pixel if it is outside the screen.
Colour	get_pixel (uint32_t x, uint32_t y)
	Gets the colour of a pixel, or returns black if the pixel is outside the screen.
void	invert_pixel (uint32_t x, uint32_t y)
	Inverts a pixel.
void	draw_line (uint32_t x0, uint32_t y0, uint32_t x1, uint32_t y1, const Colour &colour)
	Draws a line on the screen.
void	draw_line (uint32_t x0, uint32_t y0, uint32_t x1, uint32_t y1, uint32_t colour)
	Draws a line on the screen.
void	draw_rectangle (uint32_t x0, uint32_t y0, uint32_t x1, uint32_t y1, const Colour &colour)
	Draws a rectangle on the screen.
void	draw_rectangle (uint32_t x0, uint32_t y0, uint32_t x1, uint32_t y1, uint32_t colour)
	Draws a rectangle on the screen.
void	fill_rectangle (uint32_t x0, uint32_t y0, uint32_t x1, uint32_t y1, const Colour &colour)
	Draws a rectangle on the screen, filled with a colour.
void	fill_rectangle (uint32_t x0, uint32_t y0, uint32_t x1, uint32_t y1, uint32_t colour)
	Draws a rectangle on the screen, filled with a colour.
void	draw_circle (uint32_t x0, uint32_t y0, uint32_t radius, const Colour &colour)
	Draws a circle on the screen.
void	draw_circle (uint32_t x0, uint32_t y0, uint32_t radius, uint32_t colour)
	Draws a circle on the screen.
void	fill_circle (uint32_t x0, uint32_t y0, uint32_t radius, const Colour &colour)
	Draws a circle on the screen, filled with a colour.
void	fill_circle (uint32_t x0, uint32_t y0, uint32_t radius, uint32_t colour)
	Draws a circle on the screen, filled with a colour.

Additional Inherited Members
Protected Member Functions inherited from MaxOS::common::GraphicsContext
virtual void	render_pixel (uint32_t x, uint32_t y, uint32_t colour)
	Renders a pixel to the screen based on the current color depth.
virtual void	render_pixel_8_bit (uint32_t x, uint32_t y, uint8_t colour)
	Renders a pixel to the screen using the 8 bit color depth.
virtual void	render_pixel_16_bit (uint32_t x, uint32_t y, uint16_t colour)
	Renders a pixel to the screen using the 16 bit color depth.
virtual void	render_pixel_24_bit (uint32_t x, uint32_t y, uint32_t colour)
	Renders a pixel to the screen using the 24 bit color depth.
virtual uint32_t	get_rendered_pixel (uint32_t x, uint32_t y)
	Gets the colour of a pixel on the screen, automatically uses the correct color depth.
virtual uint8_t	get_rendered_pixel_8_bit (uint32_t x, uint32_t y)
	Gets the colour of a pixel on the screen using the 8 bit color depth.
virtual uint16_t	get_rendered_pixel_16_bit (uint32_t x, uint32_t y)
	Gets the colour of a pixel on the screen using the 16 bit color depth.
virtual uint32_t	get_rendered_pixel_24_bit (uint32_t x, uint32_t y)
	Gets the colour of a pixel on the screen using the 24 bit color depth.
Protected Attributes inherited from MaxOS::common::GraphicsContext
bool	mirror_y_axis
	Should the y axis be mirrored (0,0 is top left if false, bottom left if true)
uint32_t	m_width { 0 }
	The width of the screen in pixels.
uint32_t	m_height { 0 }
	The height of the screen in pixels.
uint32_t	m_color_depth { 0 }
	The color depth of the screen in bits per pixel.
Colour	m_colour_pallet [256]
	The colour pallet for 8 bit color depth.
uint64_t *	m_framebuffer_address { nullptr }
	The address of the framebuffer.

Detailed Description

Driver for the VESA video controller, handles the rendering of pixels to the screen using VESA.

Definition at line 26 of file vesa.h.

Constructor & Destructor Documentation

VideoElectronicsStandardsAssociation()

VideoElectronicsStandardsAssociation::VideoElectronicsStandardsAssociation ( multiboot_tag_framebuffer *  framebuffer_info )

explicit

Constructs a new VESA driver object. Maps the framebuffer into the higher half.

Parameters

framebuffer_info

The framebuffer information from multiboot

Definition at line 24 of file vesa.cpp.

: m_framebuffer_info(framebuffer_info)
{
 
    Logger::INFO() << "Setting up VESA driver\n";
 
    // Save the framebuffer info
    m_bpp = m_framebuffer_info->common.framebuffer_bpp;
    m_pitch = m_framebuffer_info->common.framebuffer_pitch;
    m_framebuffer_size = m_framebuffer_info->common.framebuffer_height * m_pitch;
    this->set_mode(framebuffer_info->common.framebuffer_width, framebuffer_info->common.framebuffer_height, framebuffer_info->common.framebuffer_bpp);
    Logger::DEBUG() << "Framebuffer: bpp=" << m_bpp << ", pitch=" << m_pitch << ", size=" << m_framebuffer_size << "\n";
 
    // Map the frame buffer into the higher half
    auto physical_address = (uint64_t) m_framebuffer_info->common.framebuffer_addr;
    m_framebuffer_address = (uint64_t *) PhysicalMemoryManager::to_dm_region(physical_address);
    PhysicalMemoryManager::s_current_manager->map_area((physical_address_t *) physical_address, m_framebuffer_address, m_framebuffer_size, WRITE | PRESENT);
 
    // Reserve the physical memory
    size_t pages = PhysicalMemoryManager::size_to_frames(m_framebuffer_size);
    PhysicalMemoryManager::s_current_manager->reserve(m_framebuffer_info->common.framebuffer_addr, pages, "Framebuffer");
 
    // Log info
    Logger::DEBUG() << "Framebuffer address: physical=0x" << (uint64_t) physical_address << ", virtual=0x" << (uint64_t) m_framebuffer_address << "\n";
    Logger::DEBUG() << "Framebuffer mapped: 0x" << (uint64_t) m_framebuffer_address << " - 0x" << (uint64_t) (m_framebuffer_address + m_framebuffer_size) << " (pages: " << pages << ")\n";
 
}

References multiboot_tag_framebuffer::common, MaxOS::Logger::DEBUG(), MaxOS::Logger::INFO(), MaxOS::common::GraphicsContext::m_framebuffer_address, MaxOS::memory::PRESENT, MaxOS::memory::PhysicalMemoryManager::s_current_manager, MaxOS::drivers::video::VideoDriver::set_mode(), MaxOS::memory::PhysicalMemoryManager::size_to_frames(), MaxOS::memory::PhysicalMemoryManager::to_dm_region(), and MaxOS::memory::WRITE.

Member Function Documentation

device_name()

string VideoElectronicsStandardsAssociation::device_name ( )

finalvirtual

The name of the device.

Returns

The name of the device

Reimplemented from MaxOS::drivers::Driver.

Definition at line 130 of file vesa.cpp.

                                                         {
    return "VESA compatible graphics card";
}

supports_mode()

bool VideoElectronicsStandardsAssociation::supports_mode ( uint32_t  width, uint32_t  height, uint32_t  color_depth  )

finalvirtual

Checks if the VESA driver supports the given mode.

Parameters

width	The m_width of the screen
height	The m_height of the screen
color_depth	The color depth of the screen

Returns

Reimplemented from MaxOS::drivers::video::VideoDriver.

Definition at line 79 of file vesa.cpp.

                                                                                                              {
 
    // Check if the mode is supported
    return width == m_framebuffer_info->common.framebuffer_width
           && height == m_framebuffer_info->common.framebuffer_height
           && color_depth == m_framebuffer_info->common.framebuffer_bpp;
}

References MaxOS::common::GraphicsContext::color_depth(), multiboot_tag_framebuffer::common, MaxOS::common::GraphicsContext::height(), and MaxOS::common::GraphicsContext::width().

vendor_name()

string VideoElectronicsStandardsAssociation::vendor_name ( )

finalvirtual

The name of the vendor of the VESA standard.

Returns

The name of the vendor

Reimplemented from MaxOS::drivers::Driver.

Definition at line 119 of file vesa.cpp.

                                                         {
 
    // Creator of the VESA standard
    return "NEC Home Electronics";
}

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The documentation for this class was generated from the following files:

• /home/runner/work/MaxOS/MaxOS/kernel/include/drivers/video/vesa.h
• /home/runner/work/MaxOS/MaxOS/kernel/src/drivers/video/vesa.cpp