island-ctory/src/vram.h

#ifndef IS_VRAM_H_
#define IS_VRAM_H_

#include <stdint.h>

#define MAX_XFERS 5

typedef enum { XFER_TYPE_ROW, XFER_TYPE_COL } MEM_XFER_TYPE;

typedef struct {
    uint8_t type;
    uint16_t dest;
    const uint8_t *source;
    uint8_t size;
} mem_xfer_t;

extern mem_xfer_t mem_xfer_queue[MAX_XFERS];
extern uint8_t mem_xfer_queue_size;

/**
 * @brief Initialize VRAM engine
 */
void vram_init(void);

/**
 * @brief Process VRAM memory transfers
 */
void vram_update(void);

#define vram_enqueue_mem_xfer(_type, _dest, _source, _size)        \
    do {                                                           \
        mem_xfer_t *node = &mem_xfer_queue[mem_xfer_queue_size++]; \
        node->type = (_type);                                      \
        node->dest = (_dest);                                      \
        node->source = (_source);                                  \
        node->size = (_size);                                      \
    } while (0)

#endif