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https://github.com/buserror/mii_emu.git
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cdca612df2
Instead of using the sub-standard __int128 Signed-off-by: Michel Pollet <buserror@gmail.com>
54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
/*
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* mii_video.h
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*
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* Copyright (C) 2023 Michel Pollet <buserror@gmail.com>
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*
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* SPDX-License-Identifier: MIT
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*/
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#pragma once
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#include "mii_types.h"
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// TODO move VRAM stuff to somewhere else
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/*
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These are currently way bigger than needed, because they need to be
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a power of two to easily map to an opengl texture.
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*/
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#define MII_VRAM_WIDTH 1024
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#define MII_VRAM_HEIGHT 512
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#define MII_VIDEO_WIDTH (280 * 2)
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#define MII_VIDEO_HEIGHT (192 * 2)
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enum {
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MII_VIDEO_COLOR = 0,
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MII_VIDEO_GREEN,
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MII_VIDEO_AMBER,
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};
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struct mii_t;
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typedef struct mii_video_t {
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void * state; // protothread state in mii_video.c
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uint8_t line; // current line
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bool vbl_irq; // VBL IRQ emabled (set by mouse card)
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mii_cycles_t wait; // 'wait until' cycle marker
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uint32_t pixels[MII_VRAM_WIDTH * MII_VRAM_HEIGHT];
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uint32_t frame_count; // incremented every frame
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uint32_t frame_drawn;
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uint8_t color_mode; // color, green, amber
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} mii_video_t;
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bool
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mii_access_video(
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struct mii_t *mii,
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uint16_t addr,
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uint8_t * byte,
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bool write);
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void
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mii_video_run(
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struct mii_t *mii);
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