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Fix shot collisions

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This commit is contained in:
Miloslav Číž 2020-02-10 12:55:15 +01:00
parent 9b6803936f
commit 75476da4af
2 changed files with 64 additions and 37 deletions
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7
constants.h
View File

@ -41,6 +41,13 @@
*/
#define SFG_MELEE_RANGE 1600
/**
When a projectile is shot, it'll be offset by this distance (in RCL_Units)
from the shooter.
*/
#define SFG_PROJECTILE_SPAWN_OFFSET 256
/**
Player's melee hit range, in RCL_Units (RCL_UNITS_PER_SQUARE means full angle,
180 degrees to both sides).

94
main.c
View File

@ -1637,7 +1637,7 @@ void SFG_monsterPerformAI(SFG_MonsterRecord *monster)
) + RCL_UNITS_PER_SQUARE / 2,
dir,
0,
SFG_ELEMENT_COLLISION_DISTANCE
SFG_PROJECTILE_SPAWN_OFFSET
);
}
}
@ -1842,6 +1842,35 @@ static inline uint8_t SFG_elementCollides(
<= SFG_ELEMENT_COLLISION_DISTANCE;
}
/**
Checks collision of a projectile with level element at given position.
*/
uint8_t SFG_projectileCollides(SFG_ProjectileRecord *projectile,
RCL_Unit x, RCL_Unit y, RCL_Unit z)
{
if (!SFG_elementCollides(x,y,z,
projectile->position[0],projectile->position[1],projectile->position[2]))
return 0;
if ((projectile->type == SFG_PROJECTILE_EXPLOSION) ||
(projectile->type == SFG_PROJECTILE_DUST))
return 0;
/* For directional projectiles we only register a collision if its direction
is "towards" the element so that the shooter doesn't get shot by his own
projectile. */
RCL_Vector2D projDir, toElement;
projDir.x = projectile->direction[0];
projDir.y = projectile->direction[1];
toElement.x = x - projectile->position[0];
toElement.y = y - projectile->position[1];
return RCL_vectorsAngleCos(projDir,toElement) >= 0;
}
SFG_getLevelElementSprite(
uint8_t elementType, uint8_t *spriteIndex, uint8_t *spriteSize)
{
@ -1984,7 +2013,7 @@ void SFG_gameStep()
(SFG_player.camera.shear *
SFG_GET_PROJECTILE_SPEED_UPS(projectile)) /
SFG_CAMERA_MAX_SHEAR_PIXELS,
SFG_ELEMENT_COLLISION_DISTANCE + RCL_CAMERA_COLL_RADIUS
SFG_PROJECTILE_SPAWN_OFFSET
);
direction += angleAdd;
@ -2432,12 +2461,12 @@ void SFG_gameStep()
uint8_t eliminate = 0;
for (uint8_t j = 0; j < 3; ++j) // projectile outside map?
for (uint8_t j = 0; j < 3; ++j)
{
pos[j] = p->position[j];
pos[j] += p->direction[j];
if (
if ( // projectile outside map?
(pos[j] < 0) ||
(pos[j] >= (SFG_MAP_SIZE * RCL_UNITS_PER_SQUARE)))
{
@ -2450,36 +2479,33 @@ void SFG_gameStep()
{
eliminate = 1;
}
else if (SFG_elementCollides( // hits player?
SFG_player.camera.position.x,
SFG_player.camera.position.y,
SFG_player.camera.height,
p->position[0],
p->position[1],
p->position[2]
))
{
eliminate = 1;
SFG_playerChangeHealth(-1 * SFG_getDamageValue(attackType));
}
else if (
(p->type != SFG_PROJECTILE_EXPLOSION) &&
(p->type != SFG_PROJECTILE_DUST))
{
if (SFG_projectileCollides( // collides with player?
p,
SFG_player.camera.position.x,
SFG_player.camera.position.y,
SFG_player.camera.height))
{
eliminate = 1;
SFG_playerChangeHealth(-1 * SFG_getDamageValue(attackType));
}
// check collision with the map
if (
(SFG_floorHeightAt(pos[0] / RCL_UNITS_PER_SQUARE,pos[1] /
if (!eliminate &&
((SFG_floorHeightAt(pos[0] / RCL_UNITS_PER_SQUARE,pos[1] /
RCL_UNITS_PER_SQUARE) >= pos[2])
||
(SFG_ceilingHeightAt(pos[0] / RCL_UNITS_PER_SQUARE,pos[1] /
RCL_UNITS_PER_SQUARE) <= pos[2])
RCL_UNITS_PER_SQUARE) <= pos[2]))
)
eliminate = 1;
// check collision with active level elements
if (!eliminate) // monsters
for (uint16_t j = 0; j < SFG_currentLevel.monsterRecordCount; ++j)
{
@ -2487,18 +2513,13 @@ void SFG_gameStep()
if (SFG_MR_STATE(*m) != SFG_MONSTER_STATE_INACTIVE)
{
if (
SFG_elementCollides(
p->position[0],
p->position[1],
p->position[2],
SFG_MONSTER_COORD_TO_RCL_UNITS(m->coords[0]),
SFG_MONSTER_COORD_TO_RCL_UNITS(m->coords[1]),
SFG_floorHeightAt(
SFG_MONSTER_COORD_TO_SQUARES(m->coords[0]),
SFG_MONSTER_COORD_TO_SQUARES(m->coords[1]))
)
)
if (SFG_projectileCollides(p,
SFG_MONSTER_COORD_TO_RCL_UNITS(m->coords[0]),
SFG_MONSTER_COORD_TO_RCL_UNITS(m->coords[1]),
SFG_floorHeightAt(
SFG_MONSTER_COORD_TO_SQUARES(m->coords[0]),
SFG_MONSTER_COORD_TO_SQUARES(m->coords[1]))
))
{
eliminate = 1;
SFG_monsterChangeHealth(m,-1 * SFG_getDamageValue(attackType));
@ -2518,10 +2539,7 @@ void SFG_gameStep()
RCL_Unit y = SFG_ELEMENT_COORD_TO_RCL_UNITS(e->coords[1]);
RCL_Unit z = SFG_floorHeightAt(e->coords[0],e->coords[1]);
if (
SFG_elementCollides(p->position[0],p->position[1],p->position[2],
x,y,z)
)
if (SFG_projectileCollides(p,x,y,z))
{
if (
(e->type == SFG_LEVEL_ELEMENT_BARREL) &&
@ -2545,6 +2563,8 @@ void SFG_gameStep()
SFG_createExplosion(p->position[0],p->position[1],p->position[2]);
else if (p->type == SFG_PROJECTILE_BULLET)
SFG_createDust(p->position[0],p->position[1],p->position[2]);
else if (p->type == SFG_PROJECTILE_PLASMA)
SFG_playSoundSafe(4,SFG_distantSoundVolume(pos[0],pos[1],pos[2]));
// remove the projectile