analog-firmware/vga/vgaout.h

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2023-04-06 03:53:21 +00:00
#pragma once
#include <stdint.h>
#define VGA_WIDTH 640
#define VGA_HEIGHT 480
#ifdef ANALOG_GS
#define THEN_WAIT_VSYNC (2 << 12)
#define THEN_WAIT_HSYNC (3 << 12)
#define THEN_EXTEND_31 (4 << 12)
#define THEN_EXTEND_15 (5 << 12)
#define THEN_EXTEND_13 (6 << 12)
#define THEN_EXTEND_7 (7 << 12)
#define THEN_EXTEND_6 (8 << 12)
#define THEN_EXTEND_3 (9 << 12)
#define THEN_EXTEND_1 (10 << 12)
#else
#define THEN_WAIT_VSYNC (2 << 9)
#define THEN_WAIT_HSYNC (3 << 9)
#define THEN_EXTEND_31 (4 << 9)
#define THEN_EXTEND_15 (5 << 9)
#define THEN_EXTEND_13 (6 << 9)
#define THEN_EXTEND_7 (7 << 9)
#define THEN_EXTEND_6 (8 << 9)
#define THEN_EXTEND_3 (9 << 9)
#define THEN_EXTEND_1 (10 << 9)
#endif
struct vga_scanline {
// number of 32-bit words in the data array
uint_fast16_t length;
// number of times to repeat the scanline
uint_fast16_t repeat_count;
volatile uint_fast8_t _flags;
uint32_t _sync;
uint32_t data[(VGA_WIDTH/2)+8];
};
void vga_prepare_frame();
struct vga_scanline *vga_prepare_scanline();
void vga_submit_scanline(struct vga_scanline *scanline);
void vga_stop();
void vga_dpms_sleep();
void vga_dpms_wake();