borgware-2d/games/space_invaders/invader_init.c

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#include <stdint.h>
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#include <string.h>
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#include "../../compat/pgmspace.h"
#include "invaders2.h"
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uint16_t const peter[8] PROGMEM =
{0x0104, 0x0088, 0x01FC, 0x0376, 0x07FF, 0x05FD, 0x0505, 0x00D8};
uint16_t const hans[7] PROGMEM =
{0x0000, 0x0372, 0x0552, 0x0372, 0x0552, 0x0356, 0x0000};
void initGuards(unsigned char *guards)
{
memset(guards, 0, NUM_COLS);
#if NUM_COLS == 16
guards[2] = 3;
guards[5] = 3;
guards[10] = 3;
guards[13] = 3;
#else
unsigned const guard_min_distance = 3;
unsigned char pos;
for (pos = 0; pos <= ((NUM_COLS - (guard_min_distance - 1)) / 2); ++pos)
{
if (((pos % guard_min_distance) == 0) && (pos != 0))
{
guards[pos - 1] = 3;
guards[NUM_COLS - pos] = 3;
}
}
#endif
}
void initInvaders(Invaders * iv, unsigned char lv)
{
unsigned char x, y;
// first zero out map!
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memset(iv->map, 0, sizeof(iv->map));
iv->speedinc = 0;
iv->isEdged = 0;
switch (lv)
{
case 0:
default:
for (x = 0; x < 8; ++x)
{
iv->map[x][0] = 2;
iv->map[x][1] = 2;
iv->map[x][2] = 2;
iv->map[x][3] = 1;
}
iv->pos.x = (NUM_COLS - 8) / 2;
iv->pos.y = SPACESHIP_LINE + 1;
iv->speed = MIN_SPEED - 3;
iv->direction = 1;
break;
case 1:
for (x = 0; x < 8; ++x)
{
iv->map[x][0] = 3;
iv->map[x][1] = 3;
iv->map[x][2] = 2;
iv->map[x][3] = 2;
}
iv->pos.x = (NUM_COLS - 8) / 2;
iv->pos.y = SPACESHIP_LINE + 1;
iv->speed = MIN_SPEED - 2;
iv->direction = 1;
break;
case 2:
for (x = 0; x < 8; ++x)
{
iv->map[x][0] = 3;
iv->map[x][1] = 3;
iv->map[x][2] = 2;
iv->map[x][3] = 2;
iv->map[x][4] = 1;
}
iv->pos.x = (NUM_COLS - 8) / 2;
iv->pos.y = SPACESHIP_LINE + 1;
iv->speed = MIN_SPEED - 1;
iv->direction = 1;
break;
case 3:
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for (y = 7; y--;)
{
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uint16_t hansrow = pgm_read_word(&hans[y]);
uint16_t mask = 0x0001;
for (x = 11; x--;)
{
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iv->map[x][y] = (hansrow & mask) ? 3 : 1;
mask <<= 1;
}
}
iv->pos.x = (NUM_COLS - 11) / 2;
iv->pos.y = SPACESHIP_LINE + 1;
iv->speed = MIN_SPEED + 2;
iv->direction = 1;
break;
case 4:
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for (y = 8; y--;)
{
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uint16_t peterrow = pgm_read_word(&peter[y]);
uint16_t mask = 0x0001;
for (x = 11; x--;)
{
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if (peterrow & mask)
{
iv->map[x][y] = 2;
}
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mask <<= 1;
}
}
iv->pos.x = (NUM_COLS - 11) / 2;
iv->pos.y = SPACESHIP_LINE + 1;
iv->speed = MIN_SPEED + 3;
iv->direction = 1;
break;
}
}