55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
#include <pipeline.h>
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#include <stdio.h>
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typedef struct {
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double x, y;
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} Position, Velocity;
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void Move(ecs_iter_t *it) {
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Position *p = ecs_field(it, Position, 1);
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const Velocity *v = ecs_field(it, const Velocity, 2);
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for (int i = 0; i < it->count; i ++) {
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p[i].x += v[i].x;
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p[i].y += v[i].y;
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}
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}
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void PrintPosition(ecs_iter_t *it) {
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const Position *p = ecs_field(it, const Position, 1);
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for (int i = 0; i < it->count; i ++) {
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printf("%s: {%f, %f}\n", ecs_get_name(it->world, it->entities[i]),
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p[i].x, p[i].y);
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}
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}
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int main(int argc, char *argv[]) {
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ecs_world_t *ecs = ecs_init_w_args(argc, argv);
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ECS_COMPONENT(ecs, Position);
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ECS_COMPONENT(ecs, Velocity);
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// Create system for moving an entity in the EcsOnUpdate phase
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ECS_SYSTEM(ecs, Move, EcsOnUpdate, Position, [in] Velocity);
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// Create system for printing a Position in the EcsPostUpdate phase
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ECS_SYSTEM(ecs, PrintPosition, EcsPostUpdate, [in] Position);
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// Create a few test entities for a Position, Velocity query
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ecs_entity_t e1 = ecs_new_entity(ecs, "e1");
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ecs_set(ecs, e1, Position, {10, 20});
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ecs_set(ecs, e1, Velocity, {1, 2});
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ecs_entity_t e2 = ecs_new_entity(ecs, "e2");
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ecs_set(ecs, e2, Position, {10, 20});
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ecs_set(ecs, e2, Velocity, {3, 4});
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// Run the default pipeline. This will run all systems ordered by their
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// phase. Systems within the same phase are ran in declaration order. This
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// function is usually called in a loop.
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ecs_progress(ecs, 0.0f);
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return ecs_fini(ecs);
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}
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