1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/include/vga_display.h Wed Oct 24 00:50:48 2018 +0200
1.3 @@ -0,0 +1,82 @@
1.4 +/*
1.5 + * VGA display-related functions.
1.6 + *
1.7 + * Copyright (C) 2018 Paul Boddie <paul@boddie.org.uk>
1.8 + *
1.9 + * This program is free software: you can redistribute it and/or modify
1.10 + * it under the terms of the GNU General Public License as published by
1.11 + * the Free Software Foundation, either version 3 of the License, or
1.12 + * (at your option) any later version.
1.13 + *
1.14 + * This program is distributed in the hope that it will be useful,
1.15 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
1.16 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1.17 + * GNU General Public License for more details.
1.18 + *
1.19 + * You should have received a copy of the GNU General Public License
1.20 + * along with this program. If not, see <http://www.gnu.org/licenses/>.
1.21 + */
1.22 +
1.23 +#ifndef __VGA_DISPLAY_H__
1.24 +#define __VGA_DISPLAY_H__
1.25 +
1.26 +#include "display.h"
1.27 +
1.28 +
1.29 +
1.30 +/* Display configuration type. */
1.31 +
1.32 +typedef struct
1.33 +{
1.34 + /* Current display state handler. */
1.35 +
1.36 + void (*state_handler)();
1.37 +
1.38 + /* Display state handlers. */
1.39 +
1.40 + void (*start_visible)();
1.41 + void (*update_visible)();
1.42 + void (*stop_visible)();
1.43 +
1.44 + /* Vertical sync operations. */
1.45 +
1.46 + void (*vsync_high)();
1.47 + void (*vsync_low)();
1.48 +
1.49 + /* Current scanline. */
1.50 +
1.51 + uint32_t line;
1.52 +
1.53 + /* Pointers to pixel lines. */
1.54 +
1.55 + uint8_t *linedata;
1.56 +
1.57 + /* General display configuration. */
1.58 +
1.59 + display_config_t *display_config;
1.60 +
1.61 +} vga_display_t;
1.62 +
1.63 +
1.64 +
1.65 +/* Initialisation. */
1.66 +
1.67 +void init_vga(display_config_t *display_config,
1.68 + void (*start_visible)(),
1.69 + void (*update_visible)(),
1.70 + void (*stop_visible)(),
1.71 + void (*vsync_high)(),
1.72 + void (*vsync_low)());
1.73 +
1.74 +/* Interrupt handlers. */
1.75 +
1.76 +void vga_interrupt_handler(void);
1.77 +
1.78 +/* Display state handlers. */
1.79 +
1.80 +void vbp_active(void);
1.81 +void visible_active(void);
1.82 +void vfp_active(void);
1.83 +void vsync_active(void);
1.84 +
1.85 +#endif /* __VGA_DISPLAY_H__ */