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#ifndef LIBTALLER_VGA_HPP
#define LIBTALLER_VGA_HPP
#include <array>
#include <cstddef>
#include <cstdint>
#include <SDL2/SDL_surface.h>
#include <SDL2/SDL_video.h>
#include "avalon.hpp"
namespace taller::vga
{
struct timings
{
unsigned active;
unsigned front_porch;
unsigned sync;
unsigned back_porch;
};
struct video_mode
{
std::uint32_t pixel_clk;
timings h;
timings v;
};
template<class Crtc>
class display : public avalon::slave
{
public:
display(Crtc &crtc, std::uint32_t base, std::uint32_t clock_hz, std::uint32_t bus_hz = 0) noexcept;
~display() noexcept;
virtual void tick() noexcept final override;
virtual bool read(std::uint32_t addr, std::uint32_t &data) noexcept final override;
virtual bool write(std::uint32_t addr, std::uint32_t data, unsigned byte_enable) noexcept final override;
void signal_tick(bool clk) noexcept;
inline bool key(std::size_t index)
{
return keys.at(index);
}
private:
unsigned ticks = 0;
unsigned refresh_ticks = 0;
unsigned max_addr = 0;
Crtc& crtc;
SDL_Window *window = nullptr;
const video_mode *mode = nullptr;
unsigned row = 0;
unsigned col = 0;
unsigned hsync_lo = 0;
unsigned hsync_hi = 0;
unsigned vsync_hi = 0;
unsigned vsync_lo = 0;
bool last_hsync = false;
bool last_vsync = false;
bool found_line = false;
const std::uint32_t clock_hz;
std::array<bool, 4> keys = {};
void move_pos() noexcept;
void scan_syncs() noexcept;
void scan_vsync() noexcept;
void put_pixel() noexcept;
void guess_mode() noexcept;
void signal_lost() noexcept;
void update_window() noexcept;
};
}
#include "vga.impl.hpp"
#endif
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