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42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
#include "types.h"
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// do not use any global variables to process gamestate
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static void integrate_acceleration(struct Body *body, float dt)
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{
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// position
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{
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V2 current = body->position;
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body->position = V2add(body->position, V2sub(current, body->old_position));
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body->position = V2add(body->position, V2scale(body->acceleration, dt * dt));
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body->old_position = current;
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}
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// rotation
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{
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float current = body->rotation;
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body->rotation = body->rotation + (current - body->old_rotation);
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body->rotation = body->rotation + body->angular_acceleration * dt * dt;
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body->old_rotation = current;
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}
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}
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void process(struct GameState *gs, float dt)
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{
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for (int i = 0; i < MAX_PLAYERS; i++)
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{
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struct Player *p = &gs->players[i];
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if (!p->connected)
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continue;
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p->body.acceleration = V2scale(p->input, 5.0f);
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p->body.angular_acceleration = p->input.x * 10.0f;
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integrate_acceleration(&p->body, dt);
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}
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for (int i = 0; i < gs->num_boxes; i++)
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{
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integrate_acceleration(&gs->boxes[i].body, dt);
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}
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} |