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power_play/src/game.c

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#include "game.h"
#include "sys.h"
#include "util.h"
#include "world.h"
#include "sprite.h"
#include "sound.h"
#include "mixer.h"
#include "math.h"
#include "scratch.h"
#include "atomic.h"
#include "app.h"
#include "log.h"
#include "phys.h"
#include "collider.h"
GLOBAL struct {
struct atomic_i32 game_thread_shutdown;
struct sys_thread game_thread;
b32 paused;
struct sprite_scope *sprite_frame_scope;
/* For debugging */
struct v2 user_cursor;
/* TODO: Remove this (testing) */
b32 extra_spawn;
b32 should_reset_level;
/* Game thread input */
struct sys_mutex game_cmds_mutex;
struct arena game_cmds_arena;
struct entity *root;
/* Bookkeeping structures */
struct entity_lookup contact_lookup;
#if COLLIDER_DEBUG
struct entity_lookup collision_debug_lookup;
#endif
/* Ticks */
struct sys_mutex prev_tick_mutex;
struct atomic_u64 prev_tick_id;
struct atomic_u64 prev_tick_continuity_gen;
struct world prev_tick;
struct world tick;
} G = ZI, DEBUG_ALIAS(G, G_game);
/* ========================== *
* Startup
* ========================== */
INTERNAL APP_EXIT_CALLBACK_FUNC_DEF(game_shutdown);
INTERNAL SYS_THREAD_ENTRY_POINT_FUNC_DEF(game_thread_entry_point, arg);
INTERNAL void reset_world(void);
struct game_startup_receipt game_startup(struct mixer_startup_receipt *mixer_sr,
struct sprite_startup_receipt *sheet_sr,
struct sound_startup_receipt *sound_sr,
struct phys_startup_receipt *phys_sr)
{
(UNUSED)mixer_sr;
(UNUSED)sheet_sr;
(UNUSED)sound_sr;
(UNUSED)phys_sr;
/* Initialize game cmd storage */
G.game_cmds_mutex = sys_mutex_alloc();
G.game_cmds_arena = arena_alloc(GIGABYTE(64));
/* Initialize empty world */
reset_world();
/* Initialize prev tick */
world_alloc(&G.prev_tick);
/* FIXME: Make the world struct itself readonly as well */
arena_set_readonly(&G.prev_tick.entity_store->arena);
G.prev_tick_mutex = sys_mutex_alloc();
G.game_thread = sys_thread_alloc(&game_thread_entry_point, NULL, STR("[P2] Game thread"));
app_register_exit_callback(&game_shutdown);
return (struct game_startup_receipt) { 0 };
}
INTERNAL APP_EXIT_CALLBACK_FUNC_DEF(game_shutdown)
{
__prof;
atomic_i32_eval_exchange(&G.game_thread_shutdown, true);
sys_thread_wait_release(&G.game_thread);
}
/* ========================== *
* Game cmd
* ========================== */
INTERNAL void push_cmds(struct game_cmd_array cmd_array)
{
struct sys_lock lock = sys_mutex_lock_e(&G.game_cmds_mutex);
struct game_cmd *cmds = arena_push_array(&G.game_cmds_arena, struct game_cmd, cmd_array.count);
MEMCPY(cmds, cmd_array.cmds, cmd_array.count * sizeof(*cmds));
sys_mutex_unlock(&lock);
}
INTERNAL struct game_cmd_array pop_cmds(struct arena *arena)
{
struct game_cmd_array array = ZI;
if (G.game_cmds_arena.pos > 0) {
struct sys_lock lock = sys_mutex_lock_e(&G.game_cmds_mutex);
struct buffer game_cmds_buff = arena_to_buffer(&G.game_cmds_arena);
arena_align(arena, alignof(struct game_cmd));
array.cmds = (struct game_cmd *)arena_push_array(arena, u8, game_cmds_buff.size);
array.count = game_cmds_buff.size / sizeof(struct game_cmd);
MEMCPY(array.cmds, game_cmds_buff.data, game_cmds_buff.size);
arena_reset(&G.game_cmds_arena);
sys_mutex_unlock(&lock);
}
return array;
}
/* ========================== *
* Reset
* ========================== */
INTERNAL void reset_world(void)
{
if (G.tick.entity_store) {
/* Release world */
world_release(&G.tick);
/* Release bookkeeping */
#if COLLIDER_DEBUG
entity_lookup_release(&G.collision_debug_lookup);
#endif
entity_lookup_release(&G.contact_lookup);
}
/* Create bookkeeping */
G.contact_lookup = entity_lookup_alloc(4096);
#if COLLIDER_DEBUG
G.collision_debug_lookup = entity_lookup_alloc(4096);
#endif
/* Re-create world */
world_alloc(&G.tick);
G.tick.continuity_gen = atomic_u64_eval(&G.prev_tick_continuity_gen) + 1;
G.tick.timescale = GAME_TIMESCALE;
}
/* ========================== *
* Test
* ========================== */
/* TODO: Remove this */
INTERNAL void spawn_test_entities(void)
{
struct entity *root = entity_from_handle(G.tick.entity_store, G.tick.entity_store->root);
root->mass_unscaled = F32_INFINITY;
root->inertia_unscaled = F32_INFINITY;
/* Player */
struct entity *player_ent = entity_nil();
//if (!G.extra_spawn) {
{
struct entity *e = entity_alloc(root);
struct v2 pos = V2(1, -1);
//struct v2 size = V2(0.5, 0.5);
//struct v2 size = V2(0.5, 0.25);
struct v2 size = V2(1.0, 1.0);
//f32 r = PI / 4;
f32 r = 0;
if (!G.extra_spawn) {
entity_enable_prop(e, ENTITY_PROP_PLAYER_CONTROLLED);
entity_enable_prop(e, ENTITY_PROP_TEST);
e->sprite = sprite_tag_from_path(STR("res/graphics/tim.ase"));
e->mass_unscaled = 10;
e->inertia_unscaled = 5;
} else {
entity_enable_prop(e, ENTITY_PROP_TEST);
e->sprite = sprite_tag_from_path(STR("res/graphics/tim.ase"));
e->mass_unscaled = 10;
e->inertia_unscaled = 5;
#if 0
e->sprite = sprite_tag_from_path(STR("res/graphics/box.ase"));
e->mass_unscaled = 100;
e->inertia_unscaled = 100;
#endif
}
//e->sprite = sprite_tag_from_path(STR("res/graphics/box_rounded.ase"));
//e->sprite_span_name = STR("idle.unarmed");
//e->sprite_span_name = STR("idle.one_handed");
e->sprite_span_name = STR("idle.two_handed");
e->sprite_collider_slice = STR("shape");
struct xform xf = XFORM_TRS(.t = pos, .r = r, .s = size);
//xf.bx.y = -1.f;
entity_set_xform(e, xf);
e->linear_ground_friction = 250;
e->angular_ground_friction = 200;
//e->control_force = 500;
e->control_force = 500;
//e->control_force_max_speed = 4;
e->control_torque = 1000;
e->control_force_max_speed = 4;
entity_enable_prop(e, ENTITY_PROP_PHYSICAL_DYNAMIC);
player_ent = e;
}
/* Enemy */
{
struct entity *e = entity_alloc(root);
struct v2 pos = V2(1, -2);
f32 r = 0;
struct v2 size = V2(1, 1);
struct xform xf = XFORM_TRS(.t = pos, .r = r, .s = size);
entity_set_xform(e, xf);
e->sprite = sprite_tag_from_path(STR("res/graphics/tim.ase"));
e->sprite_collider_slice = STR("shape");
entity_enable_prop(e, ENTITY_PROP_PHYSICAL_DYNAMIC);
e->mass_unscaled = 10;
e->inertia_unscaled = 10;
e->linear_ground_friction = 250;
e->angular_ground_friction = 200;
}
/* Box */
#if 0
{
struct entity *e = entity_alloc(root);
struct v2 pos = V2(1, -0.5);
f32 r = 0;
struct v2 size = V2(0.5, 0.25);
struct xform xf = XFORM_TRS(.t = pos, .r = r, .s = size);
entity_set_xform(e, xf);
e->sprite = sprite_tag_from_path(STR("res/graphics/box.ase"));
e->sprite_collider_slice = STR("shape");
entity_enable_prop(e, ENTITY_PROP_PHYSICAL_DYNAMIC);
e->mass_unscaled = 10;
e->inertia_unscaled = 10;
e->linear_ground_friction = 250;
e->angular_ground_friction = 5;
}
#endif
/* Player weapon */
if (player_ent->valid) {
struct entity *e = entity_alloc(player_ent);
e->sprite = sprite_tag_from_path(STR("res/graphics/gun.ase"));
entity_enable_prop(e, ENTITY_PROP_ATTACHED);
e->attach_slice = STR("attach.wep");
entity_enable_prop(e, ENTITY_PROP_WEAPON);
e->trigger_delay = 1.0f / 10.0f;
player_ent->equipped = e->handle;
}
/* Camera */
if (!G.extra_spawn && player_ent->valid) {
struct entity *e = entity_alloc(root);
entity_set_xform(e, XFORM_IDENT);
entity_enable_prop(e, ENTITY_PROP_CAMERA);
entity_enable_prop(e, ENTITY_PROP_CAMERA_ACTIVE);
e->camera_follow = player_ent->handle;
f32 width = (f32)DEFAULT_CAMERA_WIDTH;
f32 height = (f32)DEFAULT_CAMERA_HEIGHT;
e->camera_quad_xform = XFORM_TRS(.s = V2(width, height));
}
G.extra_spawn = true;
}
/* ========================== *
* Release entities
* ========================== */
INTERNAL void release_entities_with_prop(enum entity_prop prop)
{
struct temp_arena scratch = scratch_begin_no_conflict();
struct entity_store *store = G.tick.entity_store;
/* TODO: Breadth first iteration to only release parent entities (since
* child entities will be released along with parent anyway) */
struct entity **ents_to_release = arena_dry_push(scratch.arena, struct entity *);
u64 ents_to_release_count = 0;
for (u64 entity_index = 0; entity_index < store->reserved; ++entity_index) {
struct entity *ent = &store->entities[entity_index];
if (!ent->valid) continue;
if (entity_has_prop(ent, prop)) {
*arena_push(scratch.arena, struct entity *) = ent;
++ents_to_release_count;
}
}
for (u64 i = 0; i < ents_to_release_count; ++i) {
struct entity *ent = ents_to_release[i];
if (ent->valid) {
/* Release */
entity_release(store, ent);
}
}
scratch_end(scratch);
}
/* ========================== *
* Respond to physics collisions
* ========================== */
INTERNAL PHYS_COLLISION_CALLBACK_FUNC_DEF(on_collision, array)
{
struct entity_store *store = G.tick.entity_store;
struct entity *root = entity_from_handle(store, store->root);
for (u64 i = 0; i < array.count; ++i) {
struct phys_collision_data *data = &array.a[i];
struct phys_contact_constraint *constraint = data->constraint;
struct entity *e0 = entity_from_handle(store, data->e0);
struct entity *e1 = entity_from_handle(store, data->e1);
if (entity_is_valid_and_active(e0) && entity_is_valid_and_active(e1)) {
/* Bullet hit entity */
if (entity_has_prop(e0, ENTITY_PROP_BULLET) || entity_has_prop(e1, ENTITY_PROP_BULLET)) {
struct v2 normal = data->normal; /* Impact normal */
struct v2 vrel = v2_neg(data->vrel); /* Impact velocity */
struct entity *target = e0;
struct entity *bullet = e1;
if (entity_has_prop(e0, ENTITY_PROP_BULLET)) {
target = e1;
bullet = e0;
normal = v2_neg(normal);
vrel = v2_neg(vrel);
}
struct entity *src = entity_from_handle(store, bullet->bullet_src);
if (bullet->bullet_has_hit || entity_handle_eq(src->top, target->top)) {
/* Ignore collision if bullet already spent or if weapon and
* target share same top level parent */
/* NOTE: Since bullet is most likely just a sensor skip_solve is probably already true */
constraint->skip_solve = true;
} else {
struct v2 point = data->point;
/* Update bullet */
bullet->bullet_has_hit = true;
entity_enable_prop(bullet, ENTITY_PROP_RELEASE_THIS_TICK);
/* Update tracer */
struct entity *tracer = entity_from_handle(store, bullet->bullet_tracer);
if (entity_is_valid_and_active(tracer)) {
struct xform xf = entity_get_xform(tracer);
xf.og = point;
entity_set_xform(tracer, xf);
entity_set_linear_velocity(tracer, V2(0, 0));
}
/* Update target */
struct v2 knockback = v2_mul(v2_norm(vrel), bullet->bullet_knockback);
entity_apply_linear_impulse(target, knockback, point);
/* Create test blood */
/* TODO: Remove this */
{
struct xform xf = XFORM_TRS(.t = point, .r = sys_rand_f32(0, TAU));
struct entity *decal = entity_alloc(root);
decal->sprite = sprite_tag_from_path(STR("res/graphics/blood.ase"));
decal->sprite_tint = RGBA_32_F(1, 1, 1, 0.25f);
entity_set_xform(decal, xf);
f32 perp_range = 0.5;
struct v2 linear_velocity = v2_mul(normal, 0.5);
linear_velocity = v2_add(linear_velocity, v2_mul(v2_perp(normal), sys_rand_f32(-perp_range, perp_range)));
f32 angular_velocity_range = 5;
f32 angular_velocity = sys_rand_f32(-angular_velocity_range, angular_velocity_range);
entity_enable_prop(decal, ENTITY_PROP_PHYSICAL_KINEMATIC);
entity_set_linear_velocity(decal, linear_velocity);
entity_set_angular_velocity(decal, angular_velocity);
decal->linear_damping = 5.0f;
decal->angular_damping = 5.0f;
}
}
}
}
}
}
/* ========================== *
* Update
* ========================== */
INTERNAL void publish_game_tick(void)
{
__prof;
struct sys_lock lock = sys_mutex_lock_e(&G.prev_tick_mutex);
arena_set_readwrite(&G.prev_tick.entity_store->arena);
{
world_copy_replace(&G.prev_tick, &G.tick);
}
arena_set_readonly(&G.prev_tick.entity_store->arena);
atomic_u64_eval_exchange(&G.prev_tick_id, G.prev_tick.tick_id);
atomic_u64_eval_exchange(&G.prev_tick_continuity_gen, G.prev_tick.continuity_gen);
sys_mutex_unlock(&lock);
}
INTERNAL void game_update(struct game_cmd_array game_cmds)
{
__prof;
struct temp_arena scratch = scratch_begin_no_conflict();
/* ========================== *
* Reset level if necessary
* ========================== */
if (G.should_reset_level) {
logf_info("Clearing level");
G.should_reset_level = false;
G.extra_spawn = false;
reset_world();
}
/* ========================== *
* Begin frame
* ========================== */
++G.tick.tick_id;
G.tick.tick_ts = sys_timestamp();
G.tick.dt = max_f64(0.0, (1.0 / GAME_FPS) * G.tick.timescale);
G.tick.time += G.tick.dt;
f64 dt = G.tick.dt;
f64 time = G.tick.time;
G.sprite_frame_scope = sprite_scope_begin();
G.root = entity_from_handle(G.tick.entity_store, G.tick.entity_store->root);
struct entity *root = G.root;
struct entity_store *store = G.tick.entity_store;
struct sprite_scope *sprite_frame_scope = G.sprite_frame_scope;
(UNUSED)dt;
(UNUSED)time;
/* ========================== *
* Spawn test entities
* ========================== */
/* TODO: remove this (testing) */
/* Initialize entities */
{
static b32 run = 0;
if (!run) {
run = 1;
spawn_test_entities();
}
}
/* ========================== *
* Process global game cmds
* ========================== */
for (u64 cmd_index = 0; cmd_index < game_cmds.count; ++cmd_index) {
struct game_cmd cmd = game_cmds.cmds[cmd_index];
switch (cmd.kind) {
/* Cursor */
case GAME_CMD_KIND_CURSOR_MOVE:
{
G.user_cursor = cmd.cursor_pos;
} break;
/* Clear level */
case GAME_CMD_KIND_CLEAR_ALL:
{
G.should_reset_level = true;
} break;
/* Spawn test */
case GAME_CMD_KIND_SPAWN_TEST:
{
logf_info("Spawning (test)");
spawn_test_entities();
} break;
default: break;
};
}
/* ========================== *
* Release entities
* ========================== */
release_entities_with_prop(ENTITY_PROP_RELEASE_NEXT_TICK);
/* ========================== *
* Activate entities
* ========================== */
for (u64 entity_index = 0; entity_index < store->reserved; ++entity_index) {
struct entity *ent = &store->entities[entity_index];
if (!ent->valid) continue;
if (!entity_has_prop(ent, ENTITY_PROP_ACTIVE)) {
u64 atick = ent->activation_tick;
if (atick != 0 || G.tick.tick_id >= atick) {
entity_activate(ent, G.tick.tick_id);
}
}
}
/* ========================== *
* Reset triggered entities
* ========================== */
for (u64 entity_index = 0; entity_index < store->reserved; ++entity_index) {
struct entity *ent = &store->entities[entity_index];
if (!entity_is_valid_and_active(ent)) continue;
if (entity_has_prop(ent, ENTITY_PROP_TRIGGER_NEXT_TICK)) {
entity_disable_prop(ent, ENTITY_PROP_TRIGGER_NEXT_TICK);
entity_enable_prop(ent, ENTITY_PROP_TRIGGERED_THIS_TICK);
} else if (entity_has_prop(ent, ENTITY_PROP_TRIGGERED_THIS_TICK)) {
entity_disable_prop(ent, ENTITY_PROP_TRIGGERED_THIS_TICK);
}
}
/* ========================== *
* Update entity from sprite
* ========================== */
for (u64 entity_index = 0; entity_index < store->reserved; ++entity_index) {
struct entity *ent = &store->entities[entity_index];
if (!entity_is_valid_and_active(ent)) continue;
if (sprite_tag_is_nil(ent->sprite)) continue;
/* Update animation */
struct sprite_sheet *sheet = sprite_sheet_from_tag_await(sprite_frame_scope, ent->sprite);
{
struct sprite_sheet_span span = sprite_sheet_get_span(sheet, ent->sprite_span_name);
f64 time_in_frame = ent->animation_time_in_frame + dt;
u64 frame_index = ent->animation_frame;
if (frame_index < span.start || frame_index > span.end) {
frame_index = span.start;
}
struct sprite_sheet_frame frame = sprite_sheet_get_frame(sheet, frame_index);
while (time_in_frame > frame.duration) {
time_in_frame -= frame.duration;
++frame_index;
if (frame_index > span.end) {
/* Loop animation */
frame_index = span.start;
}
frame = sprite_sheet_get_frame(sheet, frame_index);
}
ent->animation_time_in_frame = time_in_frame;
ent->animation_frame = frame_index;
}
/* Update sprite local xform */
{
struct sprite_sheet_slice slice = sprite_sheet_get_slice(sheet, STR("pivot"), ent->animation_frame);
struct v2 sprite_size = v2_div(sheet->frame_size, (f32)PIXELS_PER_UNIT);
struct v2 dir = v2_mul_v2(sprite_size, slice.dir);
f32 rot = v2_angle(dir) + PI / 2;
struct xform xf = XFORM_IDENT;
xf = xform_rotated(xf, -rot);
xf = xform_scaled(xf, sprite_size);
xf = xform_translated(xf, v2_neg(slice.center));
ent->sprite_local_xform = xf;
}
/* Update collider from sprite */
if (ent->sprite_collider_slice.len > 0) {
struct xform cxf = ent->sprite_local_xform;
#if 0
if (entity_has_prop(ent, ENTITY_PROP_TEST)) {
f32 scale = 0.5;
cxf = xform_scaled(cxf, V2(scale, scale));
}
#endif
struct sprite_sheet_slice slice = sprite_sheet_get_slice(sheet, ent->sprite_collider_slice, ent->animation_frame);
ent->local_collider = collider_from_quad(xform_mul_quad(cxf, quad_from_rect(slice.rect)));
#if 1
if (entity_has_prop(ent, ENTITY_PROP_TEST)) {
//if ((true)) {
#if 0
ent->local_collider.points[0] = V2(0, 0);
ent->local_collider.count = 1;
ent->local_collider.radius = 0.5;
#elif 1
ent->local_collider.points[0] = v2_with_len(V2(0.08f, 0.17f), 0.15f);
ent->local_collider.points[1] = v2_with_len(V2(-0.07f, -0.2f), 0.15f);
ent->local_collider.count = 2;
ent->local_collider.radius = 0.075f;
#elif 1
#if 0
/* "Bad" winding order */
ent->local_collider.points[0] = V2(-0.15, 0.15);
ent->local_collider.points[1] = V2(0.15, 0.15);
ent->local_collider.points[2] = V2(0, -0.15);
#else
ent->local_collider.points[0] = V2(0, -0.15);
ent->local_collider.points[1] = V2(0.15, 0.15);
ent->local_collider.points[2] = V2(-0.15, 0.15);
#endif
ent->local_collider.count = 3;
ent->local_collider.radius = 0.25;
//ent->local_collider.radius = math_fabs(math_sin(G.tick.time) / 3);
#else
//ent->local_collider.radius = 0.5;
ent->local_collider.radius = 0.25;
//ent->local_collider.radius = 0.;
#endif
}
#endif
}
}
/* ========================== *
* Update attachments
* ========================== */
for (u64 entity_index = 0; entity_index < store->reserved; ++entity_index) {
struct entity *ent = &store->entities[entity_index];
if (!entity_is_valid_and_active(ent)) continue;
if (!entity_has_prop(ent, ENTITY_PROP_ATTACHED)) continue;
struct entity *parent = entity_from_handle(store, ent->parent);
struct sprite_tag parent_sprite = parent->sprite;
struct sprite_sheet *parent_sheet = sprite_sheet_from_tag_await(sprite_frame_scope, parent_sprite);
struct xform parent_sprite_xf = parent->sprite_local_xform;
struct sprite_sheet_slice attach_slice = sprite_sheet_get_slice(parent_sheet, ent->attach_slice, parent->animation_frame);
struct v2 attach_pos = xform_mul_v2(parent_sprite_xf, attach_slice.center);
struct v2 attach_dir = xform_basis_mul_v2(parent_sprite_xf, attach_slice.dir);
struct xform xf = entity_get_local_xform(ent);
xf.og = attach_pos;
xf = xform_basis_with_rotation_world(xf, v2_angle(attach_dir) + PI / 2);
entity_set_local_xform(ent, xf);
}
/* ========================== *
* Update control from player cmds
* ========================== */
for (u64 entity_index = 0; entity_index < store->reserved; ++entity_index) {
struct entity *ent = &store->entities[entity_index];
if (!entity_is_valid_and_active(ent)) continue;
if (entity_has_prop(ent, ENTITY_PROP_PLAYER_CONTROLLED)) {
/* Process cmds */
struct v2 move = ent->control.move;
struct v2 focus = ent->control.focus;
b32 firing = entity_has_prop(ent, ENTITY_PROP_TRIGGERING_EQUIPPED);
for (u64 i = 0; i < game_cmds.count; ++i) {
struct game_cmd cmd = game_cmds.cmds[i];
b32 start = cmd.state == GAME_CMD_STATE_START;
b32 stop = cmd.state == GAME_CMD_STATE_STOP;
/* TODO: Combine movement from multiple inputs? E.G. a sudden
* start and immediate stop cmd should still move the player a
* tad. */
switch (cmd.kind) {
case GAME_CMD_KIND_PLAYER_MOVE:
{
move = cmd.move_dir;
focus = cmd.aim_dir;
} break;
case GAME_CMD_KIND_PLAYER_FIRE:
{
if (start) {
firing = true;
} else if (stop) {
firing = false;
}
} break;
default: break;
}
}
/* Movement */
if (v2_len_sq(move) > 1) {
/* Cap movement vector magnitude at 1 */
move = v2_norm(move);
}
ent->control.move = move;
ent->control.focus = focus;
/* Firing */
if (firing) {
entity_enable_prop(ent, ENTITY_PROP_TRIGGERING_EQUIPPED);
} else {
entity_disable_prop(ent, ENTITY_PROP_TRIGGERING_EQUIPPED);
}
}
}
/* ========================== *
* Test
* ========================== */
#if 0
for (u64 entity_index = 0; entity_index < store->reserved; ++entity_index) {
struct entity *ent = &store->entities[entity_index];
if (!entity_is_valid_and_active(ent)) continue;
if (!entity_has_prop(ent, ENTITY_PROP_TEST)) continue;
#if 0
if (!ent->test_initialized) {
ent->test_initialized = true;
ent->test_start_local_xform = entity_get_local_xform(ent);
ent->test_start_sprite_xform = ent->sprite_local_xform;
}
f32 t = (f32)time;
struct v2 og = v2_mul(V2(math_cos(t), math_sin(t)), 3);
f32 r = t * 3;
struct v2 s = V2(1 + (math_fabs(math_sin(t * 5)) * 3), 1);
(UNUSED)og;
(UNUSED)r;
(UNUSED)s;
og = v2_add(og, ent->test_start_local_xform.og);
r += xform_get_rotation(ent->test_start_local_xform);
s = v2_add(s, xform_get_scale(ent->test_start_local_xform));
struct xform xf = entity_get_local_xform(ent);
xf.og = og;
xf = xform_rotated_to(xf, r);
xf = xform_scaled_to(xf, s);
entity_set_local_xform(ent, xf);
#else
f32 t = (f32)time;
struct v2 og = v2_mul(V2(math_cos(t), math_sin(t)), 3);
f32 rot = t * PI / 3;
struct v2 scale = V2(1 + (math_fabs(math_sin(t * 5)) * 3), 1);
(UNUSED)og;
(UNUSED)rot;
(UNUSED)scale;
struct xform xf = entity_get_local_xform(ent);
xf = xform_rotated_to(xf, rot);
xf = xform_scaled_to(xf, scale);
entity_set_local_xform(ent, xf);
#endif
}
#endif
/* ========================== *
* Trigger equipped
* ========================== */
for (u64 entity_index = 0; entity_index < store->reserved; ++entity_index) {
struct entity *ent = &store->entities[entity_index];
if (!entity_is_valid_and_active(ent)) continue;
if (entity_has_prop(ent, ENTITY_PROP_TRIGGERING_EQUIPPED)) {
struct entity *eq = entity_from_handle(store, ent->equipped);
if (entity_is_valid_and_active(eq)) {
entity_enable_prop(eq, ENTITY_PROP_TRIGGERED_THIS_TICK);
}
}
}
/* ========================== *
* Process triggered entities
* ========================== */
for (u64 entity_index = 0; entity_index < store->reserved; ++entity_index) {
struct entity *ent = &store->entities[entity_index];
if (!entity_is_valid_and_active(ent)) continue;
if (!entity_has_prop(ent, ENTITY_PROP_TRIGGERED_THIS_TICK)) continue;
if ((time - ent->last_triggered < ent->trigger_delay) && ent->last_triggered != 0) continue;
ent->last_triggered = time;
/* Fire weapon */
if (entity_has_prop(ent, ENTITY_PROP_WEAPON)) {
struct sprite_tag sprite = ent->sprite;
u32 animation_frame = ent->animation_frame;
struct sprite_sheet *sheet = sprite_sheet_from_tag_await(sprite_frame_scope, sprite);
struct xform sprite_local_xform = ent->sprite_local_xform;
struct sprite_sheet_slice out_slice = sprite_sheet_get_slice(sheet, STR("out"), animation_frame);
struct v2 rel_pos = xform_mul_v2(sprite_local_xform, out_slice.center);
struct v2 rel_dir = xform_basis_mul_v2(sprite_local_xform, out_slice.dir);
/* Spawn bullet */
struct entity *bullet;
{
bullet = entity_alloc(root);
bullet->bullet_src = ent->handle;
bullet->bullet_src_pos = rel_pos;
bullet->bullet_src_dir = rel_dir;
bullet->bullet_impulse = 0.75f;
bullet->bullet_knockback = 10;
bullet->mass_unscaled = 0.04f;
bullet->inertia_unscaled = 0.00001f;
/* Point collider */
bullet->local_collider.points[0] = V2(0, 0);
bullet->local_collider.count = 1;
entity_enable_prop(bullet, ENTITY_PROP_BULLET);
entity_enable_prop(bullet, ENTITY_PROP_SENSOR);
}
/* Spawn tracer */
{
struct entity *tracer = entity_alloc(root);
tracer->tracer_fade_duration = 0.025f;
entity_enable_prop(tracer, ENTITY_PROP_TRACER);
bullet->bullet_tracer = tracer->handle;
}
}
}
/* ========================== *
* Create forces from control move
* ========================== */
#if 0
for (u64 entity_index = 0; entity_index < store->reserved; ++entity_index) {
struct entity *ent = &store->entities[entity_index];
if (!entity_is_valid_and_active(ent)) continue;
if (entity_has_prop(ent, ENTITY_PROP_PLAYER_CONTROLLED)) {
struct v2 move = ent->control.move;
struct v2 force = v2_mul(move, ent->control_force);
entity_apply_force_to_center(ent, force);
}
}
#else
for (u64 entity_index = 0; entity_index < store->reserved; ++entity_index) {
struct entity *ent = &store->entities[entity_index];
if (!entity_is_valid_and_active(ent)) continue;
if (entity_has_prop(ent, ENTITY_PROP_PLAYER_CONTROLLED)) {
struct entity *joint_ent = entity_from_handle(store, ent->move_joint);
if (!entity_is_valid_and_active(joint_ent)) {
joint_ent = entity_alloc(root);
joint_ent->mass_unscaled = F32_INFINITY;
joint_ent->inertia_unscaled = F32_INFINITY;
entity_enable_prop(joint_ent, ENTITY_PROP_MOTOR_JOINT);
entity_enable_prop(joint_ent, ENTITY_PROP_ACTIVE);
ent->move_joint = joint_ent->handle;
struct phys_motor_joint_def def = ZI;
def.e0 = joint_ent->handle; /* Re-using joint entity as e0 */
def.e1 = ent->handle;
def.correction_rate = 0;
def.max_force = ent->control_force;
def.max_torque = 0;
joint_ent->motor_joint_data = motor_joint_from_def(def);
}
entity_set_xform(joint_ent, XFORM_IDENT); /* Reset joint ent position */
entity_set_linear_velocity(joint_ent, v2_mul(v2_clamp_len(ent->control.move, 1), ent->control_force_max_speed));
}
}
#endif
/* ========================== *
* Create forces from control focus (aim)
* ========================== */
#if GAME_PLAYER_AIM
for (u64 entity_index = 0; entity_index < store->reserved; ++entity_index) {
struct entity *ent = &store->entities[entity_index];
if (!entity_is_valid_and_active(ent)) continue;
if (entity_has_prop(ent, ENTITY_PROP_PLAYER_CONTROLLED)) {
struct xform xf = entity_get_xform(ent);
struct xform sprite_xf = xform_mul(xf, ent->sprite_local_xform);
/* Retrieve / create aim joint */
struct entity *joint_ent = entity_from_handle(store, ent->aim_joint);
if (!entity_is_valid_and_active(joint_ent)) {
joint_ent = entity_alloc(root);
joint_ent->mass_unscaled = F32_INFINITY;
joint_ent->inertia_unscaled = F32_INFINITY;
entity_enable_prop(joint_ent, ENTITY_PROP_PHYSICAL_KINEMATIC); /* Since we'll be setting velocity */
entity_enable_prop(joint_ent, ENTITY_PROP_MOTOR_JOINT);
entity_enable_prop(joint_ent, ENTITY_PROP_ACTIVE);
ent->aim_joint = joint_ent->handle;
struct phys_motor_joint_def def = ZI;
def.e0 = joint_ent->handle; /* Re-using joint entity as e0 */
def.e1 = ent->handle;
def.correction_rate = 0.1f;
def.max_force = 0;
def.max_torque = ent->control_torque;
joint_ent->motor_joint_data = motor_joint_from_def(def);
}
/* Solve for final angle using law of sines */
f32 new_angle;
{
struct v2 ent_pos = xf.og;
struct v2 focus_pos = v2_add(ent_pos, ent->control.focus);
struct v2 sprite_hold_pos;
struct v2 sprite_hold_dir;
{
struct sprite_sheet *sheet = sprite_sheet_from_tag_await(sprite_frame_scope, ent->sprite);
struct sprite_sheet_slice slice = sprite_sheet_get_slice(sheet, STR("attach.wep"), ent->animation_frame);
sprite_hold_pos = slice.center;
sprite_hold_dir = slice.dir;
}
struct v2 hold_dir = xform_basis_mul_v2(sprite_xf, sprite_hold_dir);
struct v2 hold_pos = xform_mul_v2(sprite_xf, sprite_hold_pos);
if (v2_eq(hold_pos, ent_pos)) {
/* If hold pos is same as origin (E.G if pivot is being used as hold pos), then move hold pos forward a tad to avoid issue */
sprite_hold_pos = v2_add(sprite_hold_pos, V2(0, -1));
hold_pos = xform_mul_v2(sprite_xf, sprite_hold_pos);
}
f32 forward_hold_angle_offset;
{
struct xform xf_unrotated = xform_basis_with_rotation_world(xf, 0);
struct v2 hold_pos_unrotated = xform_mul_v2(xf_unrotated, xform_mul_v2(ent->sprite_local_xform, sprite_hold_pos));
forward_hold_angle_offset = v2_angle_from_dirs(V2(0, -1), v2_sub(hold_pos_unrotated, xf_unrotated.og));
}
struct v2 hold_ent_dir = v2_sub(ent_pos, hold_pos);
struct v2 focus_ent_dir = v2_sub(ent_pos, focus_pos);
f32 hold_ent_len = v2_len(hold_ent_dir);
f32 focus_ent_len = v2_len(focus_ent_dir);
f32 final_hold_angle_btw_ent_and_focus = v2_angle_from_dirs(hold_ent_dir, hold_dir);
f32 final_focus_angle_btw_ent_and_hold = math_asin((math_sin(final_hold_angle_btw_ent_and_focus) * hold_ent_len) / focus_ent_len);
f32 final_ent_angle_btw_focus_and_hold = PI - (final_focus_angle_btw_ent_and_hold + final_hold_angle_btw_ent_and_focus);
new_angle = math_unwind_angle(v2_angle_from_dirs(V2(0, -1), v2_sub(focus_pos, ent_pos)) + final_ent_angle_btw_focus_and_hold - forward_hold_angle_offset);
}
f32 new_vel = 0;
if (!F32_IS_NAN(new_angle)) {
const f32 angle_error_allowed = 0.001f;
struct xform joint_xf = entity_get_xform(joint_ent);
f32 diff = math_unwind_angle(new_angle - xform_get_rotation(joint_xf));
if (math_fabs(diff) > angle_error_allowed) {
new_vel = diff / dt;
}
}
entity_set_angular_velocity(joint_ent, new_vel);
}
}
#endif
/* ========================== *
* Create ground friction force (gravity)
* ========================== */
for (u64 entity_index = 0; entity_index < store->reserved; ++entity_index) {
struct entity *ent = &store->entities[entity_index];
if (!entity_is_valid_and_active(ent)) continue;
if (!entity_has_prop(ent, ENTITY_PROP_PHYSICAL_DYNAMIC)) continue;
struct entity *joint_ent = entity_from_handle(store, ent->ground_friction_joint);
struct phys_motor_joint_def def = ZI;
def.e0 = root->handle;
def.e1 = ent->handle;
def.correction_rate = 0;
def.max_force = ent->linear_ground_friction;
def.max_torque = ent->angular_ground_friction;
if (joint_ent->motor_joint_data.max_force != def.max_force || joint_ent->motor_joint_data.max_torque != def.max_torque) {
if (!entity_is_valid_and_active(joint_ent)) {
joint_ent = entity_alloc(root);
entity_enable_prop(joint_ent, ENTITY_PROP_MOTOR_JOINT);
entity_enable_prop(joint_ent, ENTITY_PROP_ACTIVE);
joint_ent->motor_joint_data = motor_joint_from_def(def);
ent->ground_friction_joint = joint_ent->handle;
}
}
}
/* ========================== *
* Physics
* ========================== */
{
struct phys_ctx ctx = ZI;
ctx.tick_id = G.tick.tick_id;
ctx.store = store;
ctx.contact_lookup = &G.contact_lookup;
ctx.pre_solve_callback = on_collision;
#if COLLIDER_DEBUG
ctx.debug_lookup = &G.collision_debug_lookup;
#endif
/* Mouse drag */
ctx.dbg_cursor_pos = G.user_cursor;
for (u64 i = 0; i < game_cmds.count; ++i) {
struct game_cmd cmd = game_cmds.cmds[i];
if (cmd.kind == GAME_CMD_KIND_DRAG_OBJECT) {
if (cmd.state == GAME_CMD_STATE_START) {
ctx.dbg_start_dragging = true;
} else if (cmd.state == GAME_CMD_STATE_STOP) {
ctx.dbg_stop_dragging = true;
}
}
}
phys_step(&ctx, dt);
}
/* ========================== *
* Update tracers
* ========================== */
for (u64 entity_index = 0; entity_index < store->reserved; ++entity_index) {
struct entity *ent = &store->entities[entity_index];
if (!entity_is_valid_and_active(ent)) continue;
if (!entity_has_prop(ent, ENTITY_PROP_TRACER)) continue;
struct v2 end = entity_get_xform(ent).og;
struct v2 tick_velocity = v2_mul(ent->tracer_start_velocity, dt);
struct v2 gradient_start = v2_add(ent->tracer_gradient_start, tick_velocity);
struct v2 gradient_end = v2_add(ent->tracer_gradient_end, tick_velocity);
if (v2_dot(tick_velocity, v2_sub(gradient_start, end)) > 0) {
/* Tracer has disappeared */
entity_enable_prop(ent, ENTITY_PROP_RELEASE_NEXT_TICK);
}
ent->tracer_gradient_start = gradient_start;
ent->tracer_gradient_end = gradient_end;
}
/* ========================== *
* Initialize bullet kinematics from sources
* ========================== */
for (u64 entity_index = 0; entity_index < store->reserved; ++entity_index) {
struct entity *ent = &store->entities[entity_index];
if (!entity_is_valid_and_active(ent)) continue;
if (!entity_has_prop(ent, ENTITY_PROP_BULLET)) continue;
if (ent->activation_tick == G.tick.tick_id) {
struct entity *src = entity_from_handle(store, ent->bullet_src);
struct xform src_xf = entity_get_xform(src);
struct v2 pos = xform_mul_v2(src_xf, ent->bullet_src_pos);
struct v2 impulse = xform_basis_mul_v2(src_xf, ent->bullet_src_dir);
impulse = v2_with_len(impulse, ent->bullet_impulse);
#if 0
/* Add shooter velocity to bullet */
{
/* TODO: Add angular velocity as well? */
struct entity *top = entity_from_handle(store, src->top);
impulse = v2_add(impulse, v2_mul(top->linear_velocity, dt));
}
#endif
struct xform xf = XFORM_TRS(.t = pos, .r = v2_angle(impulse) + PI / 2);
entity_set_xform(ent, xf);
entity_enable_prop(ent, ENTITY_PROP_PHYSICAL_KINEMATIC);
entity_apply_linear_impulse_to_center(ent, impulse);
/* Initialize tracer */
struct entity *tracer = entity_from_handle(store, ent->bullet_tracer);
if (entity_is_valid_and_active(tracer)) {
entity_set_xform(tracer, xf);
entity_enable_prop(tracer, ENTITY_PROP_PHYSICAL_KINEMATIC);
entity_set_linear_velocity(tracer, ent->linear_velocity);
tracer->tracer_start = pos;
tracer->tracer_start_velocity = ent->linear_velocity;
tracer->tracer_gradient_end = pos;
tracer->tracer_gradient_start = v2_sub(pos, v2_mul(ent->linear_velocity, tracer->tracer_fade_duration));
}
}
}
/* ========================== *
* Update camera position
* ========================== */
for (u64 entity_index = 0; entity_index < store->reserved; ++entity_index) {
struct entity *ent = &store->entities[entity_index];
if (!entity_is_valid_and_active(ent)) continue;
/* Camera follow */
if (entity_has_prop(ent, ENTITY_PROP_CAMERA)) {
struct entity *follow = entity_from_handle(store, ent->camera_follow);
struct xform xf = entity_get_xform(ent);
f32 aspect_ratio = 1.0;
{
struct xform quad_xf = xform_mul(entity_get_xform(ent), ent->camera_quad_xform);
struct v2 camera_size = xform_get_scale(quad_xf);
if (!v2_is_zero(camera_size)) {
aspect_ratio = camera_size.x / camera_size.y;
}
}
f32 ratio_y = 0.33f;
f32 ratio_x = ratio_y / aspect_ratio;
struct v2 camera_focus_dir = v2_mul_v2(follow->control.focus, V2(ratio_x, ratio_y));
struct v2 camera_focus_pos = v2_add(entity_get_xform(follow).og, camera_focus_dir);
ent->camera_xform_target = xf;
ent->camera_xform_target.og = camera_focus_pos;
/* Lerp camera */
if (ent->camera_applied_lerp_continuity_gen_plus_one == ent->camera_lerp_continuity_gen + 1) {
f32 t = 1 - math_pow(2.f, -20.f * (f32)G.tick.dt);
xf = xform_lerp(xf, ent->camera_xform_target, t);
} else {
/* Skip lerp */
xf = ent->camera_xform_target;
}
ent->camera_applied_lerp_continuity_gen_plus_one = ent->camera_lerp_continuity_gen + 1;
entity_set_xform(ent, xf);
}
}
/* ========================== *
* Update sound emitters
* ========================== */
/* TODO: Sound entities should be created by game thread, but played by the
* user thread. This is so sounds play at the correct time on the user
* thread regardless of interp delay. */
for (u64 entity_index = 0; entity_index < store->reserved; ++entity_index) {
struct entity *ent = &store->entities[entity_index];
if (!entity_is_valid_and_active(ent)) continue;
if (entity_has_prop(ent, ENTITY_PROP_TEST_SOUND_EMITTER)) {
struct mixer_desc desc = ent->sound_desc;
desc.speed = G.tick.timescale;
desc.pos = entity_get_xform(ent).og;
struct sound *sound = sound_load_async(ent->sound_name, 0);
b32 played = ent->sound_handle.gen != 0;
if (sound) {
if (!played) {
ent->sound_handle = mixer_play_ex(sound, desc);
} else {
mixer_track_set(ent->sound_handle, desc);
}
}
}
}
/* ========================== *
* Release entities
* ========================== */
release_entities_with_prop(ENTITY_PROP_RELEASE_THIS_TICK);
/* ========================== *
* Publish tick
* ========================== */
/* Publish tick */
publish_game_tick();
__profframe("Game");
/* ========================== *
* End frame cache scopes
* ========================== */
sprite_scope_end(sprite_frame_scope);
scratch_end(scratch);
}
/* ========================== *
* Game thread
* ========================== */
INTERNAL SYS_THREAD_ENTRY_POINT_FUNC_DEF(game_thread_entry_point, arg)
{
struct temp_arena scratch = scratch_begin_no_conflict();
(UNUSED)arg;
sys_timestamp_t last_frame_ts = 0;
f64 target_dt = GAME_FPS > (0) ? (1.0 / GAME_FPS) : 0;
while (!atomic_i32_eval(&G.game_thread_shutdown)) {
__profscope(game_update_w_sleep);
struct temp_arena temp = arena_temp_begin(scratch.arena);
sleep_frame(last_frame_ts, target_dt);
last_frame_ts = sys_timestamp();
{
struct game_cmd_array game_cmds = pop_cmds(temp.arena);
if (!G.paused) {
game_update(game_cmds);
}
/* Check for pause / next frame cmds */
for (u64 i = 0; i < game_cmds.count; ++i) {
struct game_cmd cmd = game_cmds.cmds[i];
switch (cmd.kind) {
case GAME_CMD_KIND_PAUSE: {
G.paused = !G.paused;
} break;
case GAME_CMD_KIND_STEP: {
if (G.paused) {
G.paused = false;
game_update(game_cmds);
G.paused = true;
}
} break;
default: break;
}
}
}
arena_temp_end(temp);
}
scratch_end(scratch);
}
/* ========================== *
* Interface
* ========================== */
void game_get_latest_tick(struct world *dest)
{
__prof;
struct sys_lock lock = sys_mutex_lock_s(&G.prev_tick_mutex);
world_copy_replace(dest, &G.prev_tick);
sys_mutex_unlock(&lock);
}
u64 game_get_latest_tick_id(void)
{
return atomic_u64_eval(&G.prev_tick_id);
}
u64 game_get_latest_tick_continuity_gen(void)
{
return atomic_u64_eval(&G.prev_tick_continuity_gen);
}
void game_push_cmds(struct game_cmd_array cmd_array)
{
push_cmds(cmd_array);
}
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