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47 lines
1.2 KiB
47 lines
1.2 KiB
#include "vram.h"
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#include <string.h>
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#include "game.h"
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#include "sdk/video.h"
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mem_xfer_t mem_xfer_queue[MAX_XFERS];
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uint8_t mem_xfer_queue_size;
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void vram_init(void) { mem_xfer_queue_size = 0; }
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static inline void vram_xfer_row(uint8_t *dest, const uint8_t *source,
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uint8_t size) {
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while (size > 0) {
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*dest++ = *source++;
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if ((uint8_t)dest % 32 == 0) {
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dest -= 32;
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}
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size--;
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}
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}
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static inline void vram_xfer_col(uint8_t *dest, const uint8_t *source,
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uint8_t size) {
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while (size > 0) {
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*dest = *source++;
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dest += SCRN_VX_B;
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if ((uint16_t)dest >= _SCRN1) {
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dest -= _SCRN1 - _SCRN0;
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}
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size--;
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}
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}
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void vram_update(void) {
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mem_xfer_t *xfer = &mem_xfer_queue[0];
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for (uint8_t i = 0; i < mem_xfer_queue_size; i++) {
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if (xfer->type == XFER_TYPE_ROW) {
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vram_xfer_row((uint8_t *)xfer->dest, xfer->source, xfer->size);
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} else {
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vram_xfer_col((uint8_t *)xfer->dest, xfer->source, xfer->size);
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}
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xfer++;
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}
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mem_xfer_queue_size = 0;
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}
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