73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
#include "screen.h"
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#include "types.h"
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#include <clib/exec_protos.h>
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#include <exec/memory.h>
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/**
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* Includes double buffer space
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*/
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#define TOTAL_SCREEN_SETUP_SIZE(s) ((s->width / 8) * s->height * s->bitplanes * 2)
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void setupScreen(
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struct ScreenSetup *screenSetup,
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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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unsigned char *memory;
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screenSetup->width = width;
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screenSetup->height = height;
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screenSetup->bitplanes = bitplanes;
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memory = (unsigned char *)AllocMem(
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TOTAL_SCREEN_SETUP_SIZE(screenSetup),
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MEMF_CLEAR | MEMF_CHIP
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);
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screenSetup->memoryStart = memory;
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screenSetup->byteWidth = width / 8;
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// memory is not interleaved
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screenSetup->nextBitplaneAdvance = screenSetup->byteWidth * height;
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screenSetup->nextBufferAdvance = screenSetup->nextBitplaneAdvance * bitplanes;
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}
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void teardownScreen(
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struct ScreenSetup *screenSetup
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) {
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FreeMem(
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screenSetup->memoryStart,
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TOTAL_SCREEN_SETUP_SIZE(screenSetup)
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);
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}
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void setCurrentScreen(
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struct ScreenSetup *screenSetup,
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struct CurrentScreen *currentScreen,
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short int buffer
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) {
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int plane;
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currentScreen->currentBuffer = buffer;
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for (plane = 0; plane < screenSetup->bitplanes; ++plane) {
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currentScreen->planes[plane] = screenSetup->memoryStart +
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buffer * screenSetup->nextBufferAdvance +
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plane * screenSetup->nextBitplaneAdvance;
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}
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}
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void setupInitialCurrentScreen(
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struct ScreenSetup *screenSetup,
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struct CurrentScreen *currentScreen
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) {
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currentScreen->pixelWidth = screenSetup->width;
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currentScreen->pixelHeight = screenSetup->height;
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currentScreen->byteWidth = screenSetup->byteWidth;
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setCurrentScreen(screenSetup, currentScreen, 0);
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}
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