/**
* @brief Converts ingame coordinates to screen coordinates.
*
* @param[out] nx New screen X coord.
* @param[out] ny New screen Y coord.
* @param bx Game X coord to translate.
* @param by Game Y coord to translate.
*/
void gl_gameToScreenCoords( double *nx, double *ny, double bx, double by )
{
double cx,cy, gx,gy, z;
/* Get parameters. */
cam_getPos( &cx, &cy );
z = cam_getZoom();
gui_getOffset( &gx, &gy );
/* calculate position - we'll use relative coords to player */
*nx = (bx - cx) * z + gx + SCREEN_W/2.;
*ny = (by - cy) * z + gy + SCREEN_H/2.;
}
/**
* @brief Converts screen coordinates to ingame coordinates.
*
* @param[out] nx New ingame X coord.
* @param[out] ny New ingame Y coord.
* @param bx Screen X coord to translate.
* @param by Screen Y coord to translate.
*/
void gl_screenToGameCoords( double *nx, double *ny, int bx, int by )
{
double cx,cy, gx,gy, z;
/* Get parameters. */
cam_getPos( &cx, &cy );
z = cam_getZoom();
gui_getOffset( &gx, &gy );
/* calculate position - we'll use relative coords to player */
*nx = (bx - SCREEN_W/2. - gx) / z + cx;
*ny = (by - SCREEN_H/2. - gy) / z + cy;
}
/**
* @brief Plays a sound based on position.
*
* @param sound Sound to play.
* @param px X position of the sound.
* @param py Y position of the sound.
* @param vx X velocity of the sound.
* @param vy Y velocity of the sound.
* @return Voice identifier on success.
*/
int sound_playPos( int sound, double px, double py, double vx, double vy )
{
alVoice *v;
alSound *s;
Pilot *p;
double cx, cy, dist;
int target;
if (sound_disabled)
return 0;
if ((sound < 0) || (sound >= sound_nlist))
return -1;
target = cam_getTarget();
/* Following a pilot. */
p = pilot_get(target);
if (target && (p != NULL)) {
if (!pilot_inRange( p, px, py ))
return 0;
}
/* Set to a position. */
else {
cam_getPos(&cx, &cy);
dist = pow2(px - cx) + pow2(py - cy);
if (dist > pilot_sensorRange())
return 0;
}
/* Gets a new voice. */
v = voice_new();
/* Get the sound. */
s = &sound_list[sound];
/* Try to play the sound. */
if (sound_sys_playPos( v, s, px, py, vx, vy ))
return -1;
/* Actually add the voice to the list. */
v->state = VOICE_PLAYING;
v->id = ++voice_genid;
voice_add(v);
return v->id;
}
/**
* @brief Renders the background images.
*/
static void background_renderImages( background_image_t *bkg_arr )
{
int i;
background_image_t *bkg;
double px,py, x,y, xs,ys, z;
/* Must have an image array created. */
if (bkg_arr == NULL)
return;
/* Render images in order. */
for (i=0; i<array_size(bkg_arr); i++) {
bkg = &bkg_arr[i];
cam_getPos( &px, &py );
x = px + (bkg->x - px) * bkg->move - bkg->scale*bkg->image->sw/2.;
y = py + (bkg->y - py) * bkg->move - bkg->scale*bkg->image->sh/2.;
gl_gameToScreenCoords( &xs, &ys, x, y );
z = cam_getZoom();
z *= bkg->scale;
gl_blitScale( bkg->image, xs, ys,
z*bkg->image->sw, z*bkg->image->sh, &bkg->col );
}
}
