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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"
GLOBAL struct {
struct atomic_i32 game_thread_shutdown;
struct sys_thread game_thread;
/* Double buffered game state */
struct world prev_world; /* Last tick */
struct world world;
/* Game thread input */
struct sys_mutex game_cmds_mutex;
struct arena game_cmds_arena;
/* Game thread output */
struct sys_mutex published_tick_mutex;
struct world published_tick;
struct atomic_u64 published_tick_id;
} G = { 0 }, 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);
struct game_startup_receipt game_startup(struct mixer_startup_receipt *mixer_sr,
struct sprite_startup_receipt *sheet_sr,
struct sound_startup_receipt *sound_sr)
{
(UNUSED)mixer_sr;
(UNUSED)sheet_sr;
(UNUSED)sound_sr;
/* Initialize game cmd storage */
G.game_cmds_mutex = sys_mutex_alloc();
G.game_cmds_arena = arena_alloc(GIGABYTE(64));
/* Initialize world */
world_alloc(&G.world);
/* Initialize tick transmission */
world_alloc(&G.published_tick);
arena_set_readonly(&G.published_tick.entity_store->arena);
G.published_tick_mutex = sys_mutex_alloc();
G.world.timescale = GAME_TIMESCALE;
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 = { 0 };
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;
}
/* ========================== *
* Test
* ========================== */
/* TODO: Remove this */
INTERNAL void spawn_test_entities(void)
{
/* Player ent */
struct entity *player_ent;
{
struct v2 pos = V2(1, 1);
struct v2 size = V2(1, 1);
f32 r = 0;
struct entity *e = entity_alloc_top(G.world.entity_store);
entity_set_xform(e, XFORM_TRS(.t = pos, .r = r, .s = size));
e->sprite = sprite_tag_from_path(STR("res/graphics/tim.ase"));
e->sprite_span_name = STR("idle.unarmed");
//e->sprite_span_name = STR("idle.one_handed");
//e->sprite_span_name = STR("idle.two_handed");
entity_enable_prop(e, ENTITY_PROP_PLAYER_CONTROLLED);
e->player_max_speed = 4.f;
e->player_acceleration = 20.0f;
e->control.focus = V2(0, -1);
entity_enable_prop(e, ENTITY_PROP_ANIMATING);
player_ent = e;
//entity_enable_prop(e, ENTITY_PROP_TEST);
}
/* Child 1 */
{
struct v2 pos = V2(1, 0);
struct v2 size = V2(1, 1);
f32 r = PI / 4;
struct xform xf = XFORM_TRS(.t = pos, .r = r, .s = size);
struct entity *e = entity_alloc_top(G.world.entity_store);
entity_set_local_xform(e, xf);
e->sprite = sprite_tag_from_path(STR("res/graphics/gun.ase"));
entity_enable_prop(e, ENTITY_PROP_ANIMATING);
entity_enable_prop(e, ENTITY_PROP_WEAPON);
player_ent->equipped = e->handle;
}
/* Camera ent */
{
struct entity *e = entity_alloc_top(G.world.entity_store);
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));
}
}
/* ========================== *
* Update
* ========================== */
INTERNAL void publish_game_tick(void)
{
__prof;
struct sys_lock lock = sys_mutex_lock_e(&G.published_tick_mutex);
arena_set_readwrite(&G.published_tick.entity_store->arena);
{
world_copy_replace(&G.published_tick, &G.world);
}
arena_set_readonly(&G.published_tick.entity_store->arena);
atomic_u64_eval_exchange(&G.published_tick_id, G.published_tick.tick_id);
sys_mutex_unlock(&lock);
}
INTERNAL void game_update(void)
{
__prof;
struct temp_arena scratch = scratch_begin_no_conflict();
/* ========================== *
* Begin frame
* ========================== */
++G.world.tick_id;
G.world.tick_ts = sys_timestamp();
G.world.dt = max_f64(0.0, (1.0 / GAME_FPS) * G.world.timescale);
G.world.time += G.world.dt;
struct game_cmd_array game_cmds = pop_cmds(scratch.arena);
struct entity_store *store = G.world.entity_store;
struct entity *root = entity_from_handle(store, store->root);
struct sprite_scope *sprite_frame_scope = sprite_scope_begin();
/* ========================== *
* 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) {
/* Clear level */
case GAME_CMD_KIND_CLEAR_ALL: {
logf_info("Clearing level");
for (u64 i = 0; i < store->count; ++i) {
struct entity *ent = &store->entities[i];
if (ent->valid && !ent->is_root) {
entity_release(store, ent);
}
}
} break;
/* Spawn test */
case GAME_CMD_KIND_SPAWN_TEST: {
logf_info("Spawning (test)");
spawn_test_entities();
} break;
default: break;
};
}
/* ========================== *
* Update sprite from animation
* ========================== */
for (u64 entity_index = 0; entity_index < store->count; ++entity_index) {
struct entity *ent = &store->entities[entity_index];
if (!ent->valid) continue;
if (sprite_tag_is_nil(ent->sprite)) continue;
/* ========================== *
* Update sprite animation
* ========================== */
if (entity_has_prop(ent, ENTITY_PROP_ANIMATING)) {
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 + G.world.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 xform
* ========================== */
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("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_rotate(xf, -rot);
xf = xform_scale(xf, sprite_size);
xf = xform_translate(xf, v2_neg(slice.center));
ent->sprite_local_xform = xf;
}
/* ========================== *
* Update entities from cmds
* ========================== */
for (u64 entity_index = 0; entity_index < store->count; ++entity_index) {
struct entity *ent = &store->entities[entity_index];
if (!ent->valid) continue;
/* ========================== *
* Initialize test
* ========================== */
/* ENTITY_PROP_TEST */
if (entity_has_prop(ent, ENTITY_PROP_TEST) && !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;
}
/* ========================== *
* Update control from player cmds
* ========================== */
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;
(UNUSED)start;
(UNUSED)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 = v2_sub(cmd.aim_pos, entity_get_xform(ent).og);
} break;
case GAME_CMD_KIND_PLAYER_FIRE: {
if (start) {
firing = true;
} else if (stop) {
firing = false;
}
} break;
default: break;
}
}
/* Movement */
if (v2_len_squared(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
* ========================== */
/* ENTITY_PROP_TEST */
if (entity_has_prop(ent, ENTITY_PROP_TEST)) {
f32 t = ((f32)G.world.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_with_rotation(xf, r);
xf= xform_with_scale(xf, s);
entity_set_local_xform(ent, xf);
}
}
/* ========================== *
* Activate triggers
* ========================== */
for (u64 entity_index = 0; entity_index < store->count; ++entity_index) {
struct entity *ent = &store->entities[entity_index];
if (!ent->valid) continue;
/* Trigger equipped */
if (entity_has_prop(ent, ENTITY_PROP_TRIGGERING_EQUIPPED)) {
struct entity *eq = entity_from_handle(store, ent->equipped);
if (eq->valid) {
entity_enable_prop(eq, ENTITY_PROP_TRIGGERED_THIS_TICK);
}
}
}
/* ========================== *
* Simulate entity physics
* ========================== */
for (u64 entity_index = 0; entity_index < store->count; ++entity_index) {
struct entity *ent = &store->entities[entity_index];
if (!ent->valid) continue;
/* ========================== *
* Weapon firing
* ========================== */
if (entity_has_prop(ent, ENTITY_PROP_WEAPON)) {
if (entity_has_prop(ent, ENTITY_PROP_TRIGGERED_THIS_TICK)) {
ent->sprite_tint = RGBA_32_F(1, 0, 0, 1);
} else {
ent->sprite_tint = RGBA_32_F(1, 1, 1, 1);
}
}
/* ========================== *
* Player angle
* ========================== */
if (entity_has_prop(ent, ENTITY_PROP_PLAYER_CONTROLLED)) {
struct xform xf = entity_get_xform(ent);
/* Solve for final angle using law of sines */
f32 final_xf_angle;
{
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("hold"), ent->animation_frame);
f32 forward_hold_angle_offset;
{
struct xform xf_unrotated = xform_with_rotation(xf, 0);
struct v2 hold_pos_unrotated = xform_mul_v2(xf_unrotated, xform_mul_v2(ent->sprite_local_xform, slice.center));
forward_hold_angle_offset = v2_angle_from_dirs(V2(0, -1), v2_sub(hold_pos_unrotated, xf_unrotated.og));
}
struct v2 ent_pos = xf.og;
struct v2 focus_pos = v2_add(ent_pos, ent->control.focus);
struct v2 hold_pos;
{
struct xform hold_pos_xf = xform_translate(ent->sprite_local_xform, slice.center);
hold_pos_xf = xform_mul(xf, hold_pos_xf);
struct v2 hold_pos_xf_dir = xform_basis_mul_v2(hold_pos_xf, slice.dir);
hold_pos_xf = xform_with_rotation(hold_pos_xf, v2_angle(hold_pos_xf_dir) + PI / 2);
if (v2_eq(hold_pos_xf.og, 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 */
hold_pos_xf = xform_translate(hold_pos_xf, V2(0, -1));
}
hold_pos = hold_pos_xf.og;
}
struct v2 hold_dir = xform_basis_mul_v2(xf, xform_basis_mul_v2(ent->sprite_local_xform, slice.dir));
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);
final_xf_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;
}
if (!F32_IS_NAN(final_xf_angle)) {
entity_set_xform(ent, xform_with_rotation(xf, final_xf_angle));
}
}
/* ========================== *
* Player movement
* ========================== */
if (entity_has_prop(ent, ENTITY_PROP_PLAYER_CONTROLLED)) {
f32 max_speed = ent->player_max_speed;
f32 acceleration_rate = ent->player_acceleration;
acceleration_rate = clamp_f32(acceleration_rate, 0, GAME_FPS); /* Can't integrate acceleration rate higher than FPS */
struct v2 target_velocity = v2_mul(ent->control.move, max_speed);
struct v2 target_acceleration = v2_sub(target_velocity, ent->velocity);
ent->acceleration = v2_mul(target_acceleration, acceleration_rate);
}
/* ========================== *
* Integrate acceleration & velocity
* ========================== */
{
f32 dt = (f32)G.world.dt;
/* Apply acceleration to velocity */
struct v2 a = v2_mul(ent->acceleration, dt);
ent->velocity = v2_add(ent->velocity, a);
/* Apply velocity to position */
struct xform xf = entity_get_xform(ent);
xf.og = v2_add(xf.og, v2_mul(ent->velocity, dt));
entity_set_xform(ent, xf);
}
}
/* ========================== *
* Update entities post-simulation
* ========================== */
for (u64 entity_index = 0; entity_index < store->count; ++entity_index) {
struct entity *ent = &store->entities[entity_index];
if (!ent->valid) continue;
/* ========================== *
* Update camera position
* ========================== */
/* 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);
if (entity_has_prop(follow, ENTITY_PROP_PLAYER_CONTROLLED)) {
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_eq(camera_size, V2(0, 0))) {
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.world.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
* ========================== */
if (entity_has_prop(ent, ENTITY_PROP_TEST_SOUND_EMITTER)) {
struct mixer_desc desc = ent->sound_desc;
desc.speed = G.world.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);
}
}
}
}
/* ========================== *
* Publish tick
* ========================== */
/* Update cached global xforms to ensure they're accurate in published tick */
{
struct temp_arena temp = arena_temp_begin(scratch.arena);
struct stack_node {
struct entity *entity;
struct xform parent_global_xform;
};
/* Depth first iteration */
*arena_push(temp.arena, struct stack_node) = (struct stack_node) { .entity = root, .parent_global_xform = XFORM_IDENT };
u64 stack_count = 1;
while (stack_count > 0) {
/* Pull from top of stack */
struct stack_node node;
arena_pop(temp.arena, struct stack_node, &node);
--stack_count;
struct entity *child = node.entity;
/* Calculate world xform */
struct xform xf;
if (child->cached_global_xform_dirty) {
xf = xform_mul(node.parent_global_xform, child->local_xform);
child->cached_global_xform = xf;
child->cached_global_xform_dirty = false;
} else {
xf = child->cached_global_xform;
}
/* Append sub-children to stack */
struct entity *subchild = entity_from_handle(store, child->last);
while (subchild->valid) {
*arena_push(temp.arena, struct stack_node) = (struct stack_node) { .entity = subchild, .parent_global_xform = xf };
++stack_count;
subchild = entity_from_handle(store, subchild->prev);
}
}
arena_temp_end(temp);
}
/* Publish tick */
publish_game_tick();
__profframe("Game");
/* ========================== *
* Reset triggered entities
* ========================== */
for (u64 entity_index = 0; entity_index < store->count; ++entity_index) {
struct entity *ent = &store->entities[entity_index];
if (!ent->valid) continue;
if (entity_has_prop(ent, ENTITY_PROP_TRIGGERED_THIS_TICK)) {
entity_disable_prop(ent, ENTITY_PROP_TRIGGERED_THIS_TICK);
}
}
/* ========================== *
* 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)
{
(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);
sleep_frame(last_frame_ts, target_dt);
last_frame_ts = sys_timestamp();
game_update();
}
}
/* ========================== *
* Interface
* ========================== */
void game_get_latest_tick(struct world *dest)
{
__prof;
struct sys_lock lock = sys_mutex_lock_e(&G.published_tick_mutex);
world_copy_replace(dest, &G.published_tick);
sys_mutex_unlock(&lock);
}
u64 game_get_latest_tick_id(void)
{
return atomic_u64_eval(&G.published_tick_id);
}
void game_push_cmds(struct game_cmd_array cmd_array)
{
push_cmds(cmd_array);
}
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