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

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#include <assert.h>
#include "invaders2.h"
/*--------------------double buffered graphics-------------------*/
static void setOffScreenPixel(offScreen_t offScreen, unsigned char x,
unsigned char y, unsigned char color)
{
assert(offScreen != 0);
assert(x < NUM_COLS);
assert(y < NUM_ROWS);
assert(color <= NUMPLANE);
offScreen[color][y][x / 8u] |= shl_table[x % 8u];
}
static void flushOffScreenBuffer(offScreen_t offScreen)
{
assert(offScreen != 0);
/* off-screen blitting borrowed from fixed point math patterns animation,
see fpmath_patterns.c (fixDrawPattern(...) for details */
unsigned char *pPixmap =
(&pixmap[NUMPLANE - 1][NUM_ROWS - 1][LINEBYTES - 1]) + 1;
unsigned char *pOffScreenDistHigh =
(&offScreen[NUMPLANE][NUM_ROWS - 1][LINEBYTES - 1]) + 1;
unsigned char *pOffScreenDistLow =
(&offScreen[NUMPLANE - 1][NUM_ROWS - 1][LINEBYTES - 1]) + 1;
while (pPixmap != &pixmap[0][0][0]) // stop at the beginning
{
*(--pPixmap) = *(--pOffScreenDistHigh);
*(--pOffScreenDistLow) |= *pOffScreenDistHigh;
*pOffScreenDistHigh = 0;
}
}
/*----------------------getter/setter----------------------------*/
unsigned char getInvaderPixel(Invaders * iv, unsigned char x, unsigned char y)
{
if (((x - iv->pos.x) < MAX_INVADER_WIDTH) && ((x - iv->pos.x) >= 0) &&
((y - iv->pos.y) < MAX_INVADER_HEIGHT) && ((y - iv->pos.y) >= 0))
{
return iv->map[x - iv->pos.x][y - iv->pos.y];
}
return 0;
}
void setInvaderPixel(Invaders * iv, unsigned char x, unsigned char y,
unsigned char val)
{
if (((x - iv->pos.x) < MAX_INVADER_WIDTH) && ((x - iv->pos.x) >= 0) &&
((y - iv->pos.y) < MAX_INVADER_HEIGHT) && ((y - iv->pos.y) >= 0))
{
iv->map[x - iv->pos.x][y - iv->pos.y] = val;
}
}
void setGuardPixel(unsigned char *guards, unsigned char x, unsigned char y,
unsigned char val)
{
assert(val <= NUMPLANE);
if (x < NUM_COLS && y == GUARD_LINE)
{
guards[x] = val;
}
}
/*----------------------drawing Method---------------------------*/
void draw(offScreen_t offScreen, Invaders * iv, Spaceship * sc, Player * pl,
Cannon * cn, unsigned char *guards, pixel *st, pixel * shot)
{
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unsigned char x, y;
/*---SPACESHIP---*/
if (sc->pos < NUM_COLS)
{
setOffScreenPixel(offScreen, sc->pos, SPACESHIP_LINE, sc->lives);
}
if ((sc->pos > 0) && ((sc->pos - 1) < NUM_COLS))
{
setOffScreenPixel(offScreen, sc->pos - 1, SPACESHIP_LINE, sc->lives);
}
/*---INVADERS--*/
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for (y = MAX_INVADER_HEIGHT; y--;)
{
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for (x = MAX_INVADER_WIDTH; x--;)
{
if ((x + iv->pos.x >= 0) && (x + iv->pos.x < NUM_COLS) &&
(y + iv->pos.y < NUM_ROWS))
{
setOffScreenPixel(offScreen, x + iv->pos.x, y + iv->pos.y,
iv->map[x][y]);
}
}
}
/*---GUARDS---*/
for (x = NUM_COLS; x--;)
{
setOffScreenPixel(offScreen, x, GUARD_LINE, guards[x]);
}
/*---SHOTS--*/
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unsigned char i;
for (i = MAX_SHOTS; i--;)
{
if (st[i].x < NUM_COLS && st[i].y < NUM_ROWS)
{
setOffScreenPixel(offScreen, st[i].x, st[i].y, 3);
}
}
/*draw player shot*/
if (!(cn->ready))
{
setOffScreenPixel(offScreen, shot->x, shot->y, 3);
}
/*-- CANNON --*/
if (cn->pos > 0) /* right border */
{
setOffScreenPixel(offScreen, cn->pos - 1, NUM_ROWS - 1, pl->lives);
}
if (cn->pos < NUM_COLS)
{
setOffScreenPixel(offScreen, cn->pos, NUM_ROWS - 2, pl->lives);
setOffScreenPixel(offScreen, cn->pos, NUM_ROWS - 1, pl->lives);
}
if (cn->pos < (NUM_COLS - 1)) /* left border */
{
setOffScreenPixel(offScreen, cn->pos + 1, NUM_ROWS - 1, pl->lives);
}
flushOffScreenBuffer(offScreen);
}