mirror of
https://github.com/V2RetroComputing/analog-firmware.git
synced 2024-06-11 13:29:32 +00:00
bc17d64651
due to how the PIO program counter operates, the pixel holds are also used to shift the active area after a HSYNC. the larger values of pixel holds caused problems and had to be removed.
48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
#pragma once
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#include <stdint.h>
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#define VGA_WIDTH 640
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#define VGA_HEIGHT 480
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#ifdef ANALOG_GS
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#define THEN_WAIT_VSYNC (2 << 12)
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#define THEN_WAIT_HSYNC (3 << 12)
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#define THEN_EXTEND_7 (4 << 12)
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#define THEN_EXTEND_6 (5 << 12)
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#define THEN_EXTEND_3 (6 << 12)
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#define THEN_EXTEND_1 (7 << 12)
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#else
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#define THEN_WAIT_VSYNC (2 << 9)
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#define THEN_WAIT_HSYNC (3 << 9)
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#define THEN_EXTEND_7 (4 << 9)
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#define THEN_EXTEND_6 (5 << 9)
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#define THEN_EXTEND_3 (6 << 9)
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#define THEN_EXTEND_1 (7 << 9)
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#endif
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struct vga_scanline {
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// number of 32-bit words in the data array
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uint_fast16_t length;
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// number of times to repeat the scanline
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uint_fast16_t repeat_count;
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volatile uint_fast8_t _flags;
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uint32_t _sync;
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uint32_t data[(VGA_WIDTH/2)+8];
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};
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extern void vga_prepare_frame();
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extern struct vga_scanline *vga_prepare_scanline();
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extern struct vga_scanline *vga_prepare_scanline_quick();
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extern void vga_submit_scanline(struct vga_scanline *scanline);
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extern void vga_stop();
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extern void vga_dpms_sleep();
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extern void vga_dpms_wake();
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extern void terminal_process_input();
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