52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
#ifndef __SCREEN_H__
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#define __SCREEN_H__
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#include "types.h"
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#define SCREEN_WIDTH (320)
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#define SCREEN_HEIGHT (256)
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struct ScreenDefinition {
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// human entered
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uint16_t width;
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uint16_t height;
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short int bitplanes;
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// calculated
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unsigned char *memoryStart;
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uint16_t byteWidth;
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uint16_t nextBitplaneAdvance;
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uint16_t nextBufferAdvance;
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};
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struct ActiveScreenBufferDetails {
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uint16_t currentBuffer;
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unsigned char *planes[8];
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};
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void allocateDoubleBufferedScreenMemory(
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struct ScreenDefinition *screenSetup,
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struct ActiveScreenBufferDetails *currentScreen,
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uint16_t width,
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uint16_t height,
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uint8_t bitplanes
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);
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void teardownScreen(struct ScreenDefinition *screenSetup);
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void setActiveScreenBuffer(
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struct ScreenDefinition *screenSetup,
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struct ActiveScreenBufferDetails *currentScreen,
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short int buffer
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);
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void swapCurrentScreenBuffer(
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struct ScreenDefinition *screenSetup,
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struct ActiveScreenBufferDetails *currentScreen
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);
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void setupInitialCurrentScreen(
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struct ScreenDefinition *screenSetup,
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struct ActiveScreenBufferDetails *currentScreen
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);
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#endif
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