diff --git a/gamestate.c b/gamestate.c index c513576..feb2420 100644 --- a/gamestate.c +++ b/gamestate.c @@ -30,9 +30,98 @@ static cpVect v2_to_cp(V2 v) return cpv(v.x, v.y); } +static struct Box *getbox(cpShape *shape) +{ + return (struct Box *)cpShapeGetUserData(shape); +} + +static int grid_num_boxes(struct Grid *g) +{ + int to_return = 0; + for (int i = 0; i < MAX_BOXES_PER_GRID; i++) + { + SKIPNULL(g->boxes[i].shape); + to_return++; + } + return to_return; +} + +static void box_destroy(cpSpace *space, struct Box *box) +{ + cpSpaceRemoveShape(space, box->shape); + cpShapeFree(box->shape); + box->shape = NULL; +} + +// space should be from gamestate, doesn't accept gamestate parameter so collision +// callbacks can use it +void grid_destroy(cpSpace *space, struct Grid *grid) +{ + for (int i = 0; i < MAX_BOXES_PER_GRID; i++) + { + SKIPNULL(grid->boxes[i].shape); + + box_destroy(space, &grid->boxes[i]); + } + + cpSpaceRemoveBody(space, grid->body); + cpBodyFree(grid->body); + grid->body = NULL; +} + +static void grid_remove_box(cpSpace *space, struct Grid *grid, struct Box *box) +{ + box_destroy(space, box); + + if (grid_num_boxes(grid) == 0) + { + grid_destroy(space, grid); + } +} + +static void postStepRemove(cpSpace *space, void *key, void *data) +{ + cpShape *b = (cpShape *)key; + if (getbox(b)->damage > 1.0f) + { + grid_remove_box(space, (struct Grid *)cpBodyGetUserData(cpShapeGetBody(b)), getbox(b)); + } +} + +static cpBool on_damage(cpArbiter *arb, cpSpace *space, cpDataPointer userData) +{ + cpShape *a, *b; + cpArbiterGetShapes(arb, &a, &b); + + double total_depth = 0.0f; + for (int i = 0; i < cpArbiterGetCount(arb); i++) + total_depth -= cpArbiterGetDepth(arb, i); + + // getbox(a)->damage += ; + + // float damage = (total_depth / 0.01) * 0.1f; + float damage = V2length(cp_to_v2(cpArbiterTotalImpulse(arb))); + Log("Collision with damage %f\n", damage*0.25f); + if (damage > 0.05f) + { + getbox(a)->damage += damage; + getbox(b)->damage += damage; + } + + // b must be the key passed into the post step removed, the key is cast into its shape + cpSpaceAddPostStepCallback(space, (cpPostStepFunc)postStepRemove, b, NULL); + cpSpaceAddPostStepCallback(space, (cpPostStepFunc)postStepRemove, a, NULL); + + return true; // keep colliding +} + void initialize(struct GameState *gs) { gs->space = cpSpaceNew(); + cpCollisionHandler *handler = cpSpaceAddCollisionHandler(gs->space, 0, 0); // @Robust limit collision type to just blocks that can be damaged + // handler->beginFunc = begin; + handler->postSolveFunc = on_damage; + // handler->postSolveFunc = postStepRemove; for (int i = 0; i < MAX_PLAYERS; i++) { reset_player(&gs->players[i]); @@ -40,13 +129,13 @@ void initialize(struct GameState *gs) } void destroy(struct GameState *gs) { - for (int i = 0; i < gs->num_grids; i++) + for (int i = 0; i < MAX_GRIDS; i++) { - grid_destroy(&gs->grids[i]); + SKIPNULL(gs->grids[i].body); + grid_destroy(gs->space, &gs->grids[i]); } - gs->num_grids = 0; - cpSpaceDestroy(gs->space); + cpSpaceFree(gs->space); gs->space = NULL; } @@ -56,9 +145,10 @@ void reset_player(struct Player *p) p->currently_inhabiting_index = -1; } -struct Box box_new(struct GameState *gs, struct Grid *grid, V2 pos) +// box must be passed as a parameter as the box added to chipmunk uses this pointer in its +// user data +void box_new(struct Box *to_modify, struct GameState *gs, struct Grid *grid, V2 pos) { - float halfbox = BOX_SIZE / 2.0f; cpBB box = cpBBNew(-halfbox + pos.x, -halfbox + pos.y, halfbox + pos.x, halfbox + pos.y); cpVect verts[4] = { @@ -68,63 +158,26 @@ struct Box box_new(struct GameState *gs, struct Grid *grid, V2 pos) cpv(box.l, box.b), }; - struct Box to_return = (struct Box){ - .shape = (cpShape *)cpPolyShapeInitRaw(cpPolyShapeAlloc(), grid->body, 4, verts, 0.0f), // this cast is done in chipmunk, not sure why it works - }; + to_modify->shape = (cpShape *)cpPolyShapeInitRaw(cpPolyShapeAlloc(), grid->body, 4, verts, 0.0f); // this cast is done in chipmunk, not sure why it works // assumed to be grid in inhabit code as well - cpShapeSetUserData(to_return.shape, (void *)grid); - cpShapeSetMass(to_return.shape, BOX_MASS); - cpSpaceAddShape(gs->space, to_return.shape); - - // update the center of mass (can't believe this isn't done for me...) - // float total_mass = 0.0f; - // float total_moment_of_inertia = 0.0f; - // V2 total_pos = {0}; - // for (int i = 0; i < grid->num_boxes; i++) - // { - // cpShape *cur_shape = grid->boxes[i].shape; - // total_mass += cpShapeGetMass(cur_shape); - // total_moment_of_inertia += cpShapeGetMoment(cur_shape); - // total_pos = V2add(total_pos, V2scale(cp_to_v2(cpShapeGetCenterOfGravity(cur_shape)), cpShapeGetMass(cur_shape))); - // } - // total_pos = V2scale(total_pos, 1.0f / total_mass); - - - // @Robust I think moment of inertia calculation is wrong? https://chipmunk-physics.net/forum/viewtopic.php?t=2566 - - return to_return; + cpShapeSetUserData(to_modify->shape, (void *)to_modify); + cpShapeSetMass(to_modify->shape, BOX_MASS); + cpSpaceAddShape(gs->space, to_modify->shape); } -struct Grid grid_new(struct GameState *gs, V2 pos) +// the grid pointer passed gets referenced by the body +void grid_new(struct Grid *to_modify, struct GameState *gs, V2 pos) { assert(gs->space != NULL); float halfbox = BOX_SIZE / 2.0f; cpBody *body = cpSpaceAddBody(gs->space, cpBodyNew(0.0, 0.0)); // zeros for mass/moment of inertia means automatically calculated from its collision shapes + to_modify->body = body; cpBodySetPosition(body, v2_to_cp(pos)); - - struct Grid to_return = (struct Grid){ - .body = body, - }; - - // box_new(gs, &to_return, (V2){0}); - - return to_return; + cpBodySetUserData(to_modify->body, (void *)to_modify); } -void grid_destroy(struct Grid *grid) -{ - for (int ii = 0; ii < grid->num_boxes; ii++) - { - cpShapeFree(grid->boxes[ii].shape); - grid->boxes[ii].shape = NULL; - } - grid->num_boxes = 0; - - cpBodyFree(grid->body); - grid->body = NULL; -} // center of mass, not the literal position V2 grid_com(struct Grid *grid) { @@ -148,7 +201,7 @@ float grid_angular_velocity(struct Grid *grid) } V2 box_pos(struct Box *box) { - struct Grid *g = (struct Grid *)cpShapeGetUserData(box->shape); + struct Grid *g = (struct Grid *)cpBodyGetUserData(cpShapeGetBody(box->shape)); return V2add(grid_pos(g), cp_to_v2(cpShapeGetCenterOfGravity(box->shape))); } float box_rotation(struct Box *box) @@ -224,11 +277,15 @@ void ser_grid(char **out, struct Grid *g) ser_float(out, grid_rotation(g)); ser_float(out, grid_angular_velocity(g)); - ser_int(out, g->num_boxes); - for (int i = 0; i < g->num_boxes; i++) + for (int i = 0; i < MAX_BOXES_PER_GRID; i++) { - ser_V2(out, cp_to_v2(cpShapeGetCenterOfGravity(g->boxes[i].shape))); - ser_float(out, g->boxes[i].damage); + bool exists = g->boxes[i].shape != NULL; + ser_bool(out, exists); + if (exists) + { + ser_V2(out, cp_to_v2(cpShapeGetCenterOfGravity(g->boxes[i].shape))); + ser_float(out, g->boxes[i].damage); + } } } @@ -247,19 +304,22 @@ void des_grid(char **in, struct Grid *g, struct GameState *gs) des_float(in, &rot); des_float(in, &angular_vel); - *g = grid_new(gs, pos); + grid_new(g, gs, pos); cpBodySetVelocity(g->body, v2_to_cp(vel)); cpBodySetAngle(g->body, rot); cpBodySetAngularVelocity(g->body, angular_vel); - des_int(in, &g->num_boxes); - - for (int i = 0; i < g->num_boxes; i++) + for (int i = 0; i < MAX_BOXES_PER_GRID; i++) { - V2 pos = {0}; - des_V2(in, &pos); - g->boxes[i] = box_new(gs, g, pos); - des_float(in, &g->boxes[i].damage); + bool exists = false; + des_bool(in, &exists); + if (exists) + { + V2 pos = {0}; + des_V2(in, &pos); + box_new(&g->boxes[i], gs, g, pos); + des_float(in, &g->boxes[i].damage); + } } } @@ -309,13 +369,17 @@ void into_bytes(struct ServerToClient *msg, char *bytes, int *out_len, int max_l } // @Robust invalid message on num boxes bigger than max boxes - ser_int(&bytes, gs->num_grids); - LEN_CHECK(); - for (int i = 0; i < gs->num_grids; i++) + for (int i = 0; i < MAX_GRIDS; i++) { - ser_grid(&bytes, &gs->grids[i]); + bool exists = gs->grids[i].body != NULL; + ser_bool(&bytes, exists); LEN_CHECK(); + if (exists) + { + ser_grid(&bytes, &gs->grids[i]); + LEN_CHECK(); + } } *out_len = bytes - original_bytes; @@ -340,13 +404,16 @@ void from_bytes(struct ServerToClient *msg, char *bytes, int max_len) LEN_CHECK(); } - des_int(&bytes, &gs->num_grids); - LEN_CHECK(); - - for (int i = 0; i < gs->num_grids; i++) + for (int i = 0; i < MAX_GRIDS; i++) { - des_grid(&bytes, &gs->grids[i], gs); + bool exists = false; + des_bool(&bytes, &exists); LEN_CHECK(); + if (exists) + { + des_grid(&bytes, &gs->grids[i], gs); + LEN_CHECK(); + } } } @@ -361,6 +428,11 @@ void process(struct GameState *gs, float dt) if (!p->connected) continue; + if (gs->grids[p->currently_inhabiting_index].body == NULL) + { + p->currently_inhabiting_index = -1; + } + if (p->inhabit) { p->inhabit = false; // "handle" the input @@ -372,9 +444,11 @@ void process(struct GameState *gs, float dt) cpShape *result = cpSpacePointQueryNearest(gs->space, v2_to_cp(p->pos), 0.1, cpShapeFilterNew(CP_NO_GROUP, CP_ALL_CATEGORIES, CP_ALL_CATEGORIES), &query_info); if (result != NULL) { - struct Grid *g = (struct Grid *)cpShapeGetUserData(result); - for (int ii = 0; ii < gs->num_grids; ii++) + // result is assumed to be a box shape + struct Grid *g = (struct Grid *)cpBodyGetUserData(cpShapeGetBody(result)); + for (int ii = 0; ii < MAX_GRIDS; ii++) { + SKIPNULL(gs->grids[ii].body); if (&gs->grids[ii] == g) { p->currently_inhabiting_index = ii; @@ -392,7 +466,7 @@ void process(struct GameState *gs, float dt) } } else - { + { p->vel = grid_vel(&gs->grids[p->currently_inhabiting_index]); p->currently_inhabiting_index = -1; } diff --git a/main.c b/main.c index 0902305..1d16d9d 100644 --- a/main.c +++ b/main.c @@ -134,7 +134,7 @@ static void frame(void) struct ServerToClient msg = { .cur_gs = &gs, }; - // @Robust maximum acceptable message size? + // @Robust @BeforeShip maximum acceptable message size? from_bytes(&msg, event.packet->data, event.packet->dataLength); myplayer = msg.your_player; enet_packet_destroy(event.packet); @@ -219,7 +219,7 @@ static void frame(void) if (!p->connected) continue; static float opacities[MAX_PLAYERS] = {1.0f}; - opacities[i] = lerp(opacities[i], p->currently_inhabiting_index == -1 ? 1.0f : 0.1f, dt*7.0f); + opacities[i] = lerp(opacities[i], p->currently_inhabiting_index == -1 ? 1.0f : 0.1f, dt * 7.0f); sgp_set_color(1.0f, 1.0f, 1.0f, opacities[i]); sgp_push_transform(); float psize = 0.1f; @@ -238,11 +238,13 @@ static void frame(void) // grids { - for (int i = 0; i < gs.num_grids; i++) + for (int i = 0; i < MAX_GRIDS; i++) { + SKIPNULL(gs.grids[i].body); struct Grid *g = &gs.grids[i]; - for (int ii = 0; ii < g->num_boxes; ii++) + for (int ii = 0; ii < MAX_BOXES_PER_GRID; ii++) { + SKIPNULL(g->boxes[ii].shape); struct Box *b = &g->boxes[ii]; sgp_set_color(0.5f, 0.5f, 0.5f, 1.0f); sgp_push_transform(); @@ -253,7 +255,13 @@ static void frame(void) sgp_draw_line(bpos.x + halfbox, bpos.y - halfbox, bpos.x + halfbox, bpos.y + halfbox); // right sgp_draw_line(bpos.x - halfbox, bpos.y + halfbox, bpos.x + halfbox, bpos.y + halfbox); // bottom sgp_draw_line(bpos.x - halfbox, bpos.y - halfbox, bpos.x + halfbox, bpos.y + halfbox); // diagonal - // sgp_draw_filled_rect(box_pos(b).x - halfbox, box_pos(b).y - halfbox, BOX_SIZE, BOX_SIZE); + + if (b->damage > 0.01f) + { + Log("Damage: %f\n", b->damage); + } + sgp_set_color(0.5f, 0.1f, 0.1f, b->damage); + sgp_draw_filled_rect(box_pos(b).x - halfbox, box_pos(b).y - halfbox, BOX_SIZE, BOX_SIZE); sgp_pop_transform(); } sgp_set_color(1.0f, 0.0f, 0.0f, 1.0f); diff --git a/server.c b/server.c index 346aa42..15b36a1 100644 --- a/server.c +++ b/server.c @@ -19,27 +19,35 @@ void server(void *data) // box haven if(true) { - gs.grids[0] = grid_new(&gs, (V2){.x = 0.75f, .y = 0.0}); - gs.grids[0].boxes[0] = box_new(&gs, &gs.grids[0], (V2){0}); - gs.grids[0].boxes[1] = box_new(&gs, &gs.grids[0], (V2){0, 0.5f}); - gs.grids[0].boxes[2] = box_new(&gs, &gs.grids[0], (V2){0, 1.0f}); - gs.grids[0].boxes[3] = box_new(&gs, &gs.grids[0], (V2){0.5f, 1.0f}); - gs.grids[0].num_boxes = 4; - - gs.grids[1] = grid_new(&gs, (V2){.x = -0.75f, .y = 0.0}); - gs.grids[1].boxes[0] = box_new(&gs, &gs.grids[1], (V2){0}); - gs.grids[1].num_boxes = 1; - - gs.num_grids = 2; + grid_new(&gs.grids[0], &gs, (V2){.x = 0.75f, .y = 0.0}); + box_new(&gs.grids[0].boxes[0],&gs, &gs.grids[0], (V2){0}); + box_new(&gs.grids[0].boxes[1],&gs, &gs.grids[0], (V2){0, 0.5f}); + box_new(&gs.grids[0].boxes[2],&gs, &gs.grids[0], (V2){0, 1.0f}); + box_new(&gs.grids[0].boxes[3],&gs, &gs.grids[0], (V2){0.5f, 1.0f}); + + grid_new(&gs.grids[1], &gs, (V2){.x = -0.75f, .y = 0.0}); + box_new(&gs.grids[1].boxes[0],&gs, &gs.grids[1], (V2){0}); + + grid_new(&gs.grids[2], &gs, (V2){.x = -0.75f, .y = 0.5}); + box_new(&gs.grids[2].boxes[0],&gs, &gs.grids[2], (V2){0}); } + + // two boxes + if (false) + { + grid_new(&gs.grids[0], &gs, (V2){.x = 0.75f, .y = 0.0}); + box_new(&gs.grids[0].boxes[0],&gs, &gs.grids[0], (V2){0}); + + grid_new(&gs.grids[1], &gs, (V2){.x = -1.75f, .y = 0.0}); + box_new(&gs.grids[1].boxes[1],&gs, &gs.grids[1], (V2){1}); + } + // one box policy if (false) { - gs.grids[0] = grid_new(&gs, (V2){.x = 0.75f, .y = 0.0}); - gs.grids[0].boxes[0] = box_new(&gs, &gs.grids[0], (V2){0}); - gs.num_grids = 1; - gs.grids[0].num_boxes = 1; + grid_new(&gs.grids[0], &gs, (V2){.x = 0.75f, .y = 0.0}); + box_new(&gs.grids[0].boxes[0],&gs, &gs.grids[0], (V2){0}); } if (enet_initialize() != 0) diff --git a/types.h b/types.h index d38c515..ee623d2 100644 --- a/types.h +++ b/types.h @@ -61,13 +61,14 @@ struct GameState V2 movement; bool inhabit; } players[MAX_PLAYERS]; - int num_grids; + + // if body or shape is null, then that grid/box has been freed + // important that this memory does not move around, each box shape in it has a pointer to its grid struct, stored in the box's shapes user_data struct Grid { cpBody *body; - int num_boxes; struct Box { cpShape *shape; @@ -102,14 +103,13 @@ void from_bytes(struct ServerToClient *gs, char *bytes, int max_len); void reset_player(struct Player *p); // grid -struct Grid grid_new(struct GameState *gs, V2 pos); -void grid_destroy(struct Grid *grid); +void grid_new(struct Grid *to_modify, struct GameState *gs, V2 pos); V2 grid_com(struct Grid *grid); V2 grid_pos(struct Grid *grid); V2 grid_vel(struct Grid *grid); float grid_rotation(struct Grid *grid); float grid_angular_velocity(struct Grid *grid); -struct Box box_new(struct GameState *gs, struct Grid *grid, V2 pos); +void box_new(struct Box *to_modify, struct GameState *gs, struct Grid *grid, V2 pos); V2 box_pos(struct Box *box); float box_rotation(struct Box *box); @@ -118,6 +118,11 @@ void dbg_drawall(); void dbg_line(V2 from, V2 to); void dbg_rect(V2 center); +// helper +#define SKIPNULL(thing) \ + if (thing == NULL) \ + continue + // all the math is static so that it can be defined in each compilation unit its included in #define PI 3.14159f