abdelrahman/dod-test
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Switch all conditions to use bit operations

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Abdelrahman Said 2025-05-20 07:39:01 +01:00
parent 6d6534a477
commit ec37297790
1 changed files with 15 additions and 10 deletions
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dod.c
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@ -6,11 +6,16 @@
#include <assert.h> #include <assert.h>
#include <string.h> #include <string.h>
#define MOVABLE_TAG_SHIFT 0
#define RENDERABLE_TAG_SHIFT 1
#define COLLIDER_TAG_SHIFT 2
#define INSIDE_ZONE_TAG_SHIFT 3
enum EntityTag { enum EntityTag {
ENTITY_TAG_MOVABLE = 1 << 0, ENTITY_TAG_MOVABLE = 1 << MOVABLE_TAG_SHIFT,
ENTITY_TAG_RENDERABLE = 1 << 1, ENTITY_TAG_RENDERABLE = 1 << RENDERABLE_TAG_SHIFT,
ENTITY_TAG_COLLIDER = 1 << 2, ENTITY_TAG_COLLIDER = 1 << COLLIDER_TAG_SHIFT,
ENTITY_TAG_INSIDE_ZONE = 1 << 3, ENTITY_TAG_INSIDE_ZONE = 1 << INSIDE_ZONE_TAG_SHIFT,
}; };
typedef struct Entity Entity; typedef struct Entity Entity;
@ -83,10 +88,10 @@ int main(void) {
VelocityInitialiser velocity_initialisers[2] = {init_velocity, zero_velocity}; VelocityInitialiser velocity_initialisers[2] = {init_velocity, zero_velocity};
for (u64 i = 0; i < manager.count; ++i) { for (u64 i = 0; i < manager.count; ++i) {
u8 is_zone = i < ZONE_COUNT; u8 is_zone = (i - ZONE_COUNT) >> 63;
manager.entities[i].id = i; manager.entities[i].id = i;
manager.tags[i] = (ENTITY_TAG_COLLIDER & (is_zone << 2)) | ENTITY_TAG_MOVABLE | ENTITY_TAG_RENDERABLE; manager.tags[i] = (ENTITY_TAG_COLLIDER & (is_zone << COLLIDER_TAG_SHIFT)) | ENTITY_TAG_MOVABLE | ENTITY_TAG_RENDERABLE;
init_position(&(manager.rects[i].position), &state); init_position(&(manager.rects[i].position), &state);
scale_initialisers[is_zone](&(manager.rects[i].scale), &state); scale_initialisers[is_zone](&(manager.rects[i].scale), &state);
@ -175,10 +180,10 @@ void update_positions(u8 *tags, Rect *rects, Velocity *velocities, u64 count) {
for (u64 i = ZONE_COUNT; i < count; ++i) { for (u64 i = ZONE_COUNT; i < count; ++i) {
tags[i] &= inside_zone_mask; tags[i] &= inside_zone_mask;
for (u64 j = 0; j < ZONE_COUNT; ++j) { for (u64 j = 0; j < ZONE_COUNT; ++j) {
tags[i] |= collides(&rects[i], &rects[j]) << 3; tags[i] |= collides(&rects[i], &rects[j]) << INSIDE_ZONE_TAG_SHIFT;
} }
index = (tags[i] & ENTITY_TAG_INSIDE_ZONE) == ENTITY_TAG_INSIDE_ZONE; index = (tags[i] & ENTITY_TAG_INSIDE_ZONE) >> INSIDE_ZONE_TAG_SHIFT;
rects[i].position.x += velocities[i].x * multipliers[index]; rects[i].position.x += velocities[i].x * multipliers[index];
rects[i].position.y += velocities[i].y * multipliers[index]; rects[i].position.y += velocities[i].y * multipliers[index];
@ -203,8 +208,8 @@ void render_entities(const u8 *tags, const Rect *rects, u64 count) {
persistent Color colors[2] = {FG_COLOR, ZONE_COLOR}; persistent Color colors[2] = {FG_COLOR, ZONE_COLOR};
for (u64 i = 0; i < count; ++i) { for (u64 i = 0; i < count; ++i) {
u8 func_index = (tags[i] & ENTITY_TAG_COLLIDER) == ENTITY_TAG_COLLIDER; u8 func_index = (tags[i] & ENTITY_TAG_COLLIDER) >> COLLIDER_TAG_SHIFT;
u8 color_index = func_index || (tags[i] & ENTITY_TAG_INSIDE_ZONE) == ENTITY_TAG_INSIDE_ZONE; u8 color_index = func_index | ((tags[i] & ENTITY_TAG_INSIDE_ZONE) >> INSIDE_ZONE_TAG_SHIFT);
renderers[func_index]( renderers[func_index](
rects[i].position.x, rects[i].position.x,