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PixelDefense/game/systems/s_input.c

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#include "systems.h"
#include "../game_state.h"
#include "../input.h"
#include "../building_factory.h"
#include "../pathfinding.h"
#include <rlImGui.h>
#include <raymath.h>
#include <rlgl.h>
#include <stdlib.h>
ecs_entity_t queryEntity(BzSpatialGrid *entityGrid, Vector2 point, ecs_entity_t tag);
bool selectEntity(BzSpatialGrid *entityGrid, Vector2 point, ecs_entity_t tag, Player player);
void selectUnits(BzSpatialGrid *entityGrid, Rectangle area, Player player);
static bool selectedAnyHasID(ecs_query_t *query, ecs_entity_t id);
void addEntityToInspected(ecs_entity_t entity, Game *game);
static void iterateSelectedUnits(ecs_query_t *query, void (*fn)(ecs_entity_t entity, Position *pos));
static void iterRemovePaths(ecs_entity_t entity, Position *pos);
i32 placeUnits(i32 numUnits, f32 unitSpacing, Vector2 start, Vector2 end, BzTileMap *map, Vector2 *outPlaces);
void resetInputState(InputState *input) {
input->cursor = CURSOR_NONE;
input->state = INPUT_NONE;
input->building = BUILDING_NONE;
}
void inputPrimaryAction(Game *game, InputState *input) {
const MouseButton primaryBtn = input->mapping.primaryBtn;
if (isInputBtnDragged(input, primaryBtn)) {
Vector2 start = input->mouseDownWorld;
Vector2 end = input->mouseWorld;
if (start.x > end.x) {
f32 tmp = start.x;
start.x = end.x;
end.x = tmp;
}
if (start.y > end.y) {
f32 tmp = start.y;
start.y = end.y;
end.y = tmp;
}
input->pickArea = (Rectangle) {start.x, start.y, end.x - start.x, end.y - start.y};
selectUnits(game->entityGrid, input->pickArea, game->player);
}
i32 selectedCount = ecs_query_entity_count(input->queries.selected);
if (isInputBtnJustDragged(input, primaryBtn) && selectedCount > 0) {
resetInputState(input);
input->state = INPUT_SELECTED_UNITS;
}
if (IsKeyDown(KEY_LEFT_ALT) && isInputBtnJustUp(input, primaryBtn)) {
ecs_entity_t entity = queryEntity(game->entityGrid, input->mouseDownWorld, ecs_id(GameEntity));
if (entity) addEntityToInspected(entity, game);
} else if (isInputBtnJustUp(input, primaryBtn)) {
InputType type = input->state;
if (selectEntity(game->entityGrid, input->mouseDownWorld, ecs_id(Unit), game->player))
type = INPUT_SELECTED_UNITS;
else if (selectEntity(game->entityGrid, input->mouseDownWorld, ecs_id(Harvestable), PLAYER_COUNT))
type = INPUT_SELECTED_OBJECT;
else if (selectEntity(game->entityGrid, input->mouseDownWorld, ecs_id(Building), game->player))
type = INPUT_SELECTED_BUILDING;
selectedCount = ecs_query_entity_count(input->queries.selected);
if (selectedCount > 0) {
resetInputState(input);
input->state = type;
}
}
if (selectedCount == 0)
resetInputState(input);
}
typedef struct EntityPosPair {
ecs_entity_t entity;
Vector2 pos;
} EntityPosPair;
static int vec2CmpZero(const void *lhsData, const void *rhsData) {
const Vector2 *lhs = lhsData;
const Vector2 *rhs = rhsData;
f32 dstL = Vector2DistanceSqr(Vector2Zero(), *lhs);
f32 dstR = Vector2DistanceSqr(Vector2Zero(), *rhs);
if (dstL < dstR) return -1;
if (dstL > dstR) return 1;
return 0;
}
static int entityPosPairCmpZero(const void *lhsData, const void *rhsData) {
const EntityPosPair *lhs = lhsData;
const EntityPosPair *rhs = rhsData;
return vec2CmpZero(&lhs->pos, &rhs->pos);
}
typedef struct EntityFloatPair {
ecs_entity_t entity;
f32 value;
} EntityFloatPair;
static int entityFloatPairCmp(const void *lhsData, const void *rhsData) {
const EntityFloatPair *lhs = lhsData;
const EntityFloatPair *rhs = rhsData;
if (lhs->value < rhs->value) return -1;
if (lhs->value > rhs->value) return 1;
return 0;
}
void inputUnitAction(Game *game, InputState *input) {
ecs_query_t *query = input->queries.selected;
BzTileMap *map = &game->map;
const i32 numUnits = ecs_query_entity_count(query);
BZ_ASSERT(numUnits > 0);
const MouseButton actionBtn = input->mapping.secondaryBtn;
input->cursor = CURSOR_NONE;
ecs_entity_t taskEntity;
bool isWorker = selectedAnyHasID(query, ecs_id(Worker));
if (isWorker && (taskEntity = queryEntity(game->entityGrid, input->mouseWorld, ecs_id(Harvestable)))) {
Resource resource = *ecs_get(ECS, taskEntity, Resource);
switch (resource.type) {
case RES_WOOD:
input->cursor = CURSOR_COLLECT_WOOD;
break;
case RES_GOLD:
input->cursor = CURSOR_COLLECT_GOLD;
break;
case RES_FOOD:
input->cursor = CURSOR_FARM;
break;
default:;
}
if (isInputBtnJustUp(input, actionBtn)) {
const f32 hRadius = 10.0f;
const Vector2 mPos = input->mouseWorld;
BzSpatialGridIter gridIt = bzSpatialGridIter(game->entityGrid,
mPos.x - hRadius, mPos.y - hRadius,
mPos.x + hRadius, mPos.y + hRadius);
EntityFloatPair *harvestables = bzStackAlloc(&game->stackAlloc, 0);
i32 numHarvestables = 0;
while (bzSpatialGridQueryNext(&gridIt)) {
ecs_entity_t harvestEntity = *(ecs_entity_t *) gridIt.data;
if (!ecs_has(ECS, harvestEntity, Harvestable))
continue;
if (!ecs_has(ECS, harvestEntity, Resource))
continue;
if (!ecs_has(ECS, harvestEntity, Position))
continue;
if (!ecs_has(ECS, harvestEntity, HitBox))
continue;
Resource res = *ecs_get(ECS, harvestEntity, Resource);
if (res.type != resource.type)
continue;
Position harvestPos = *ecs_get(ECS, harvestEntity, Position);
HitBox harvestHB = *ecs_get(ECS, harvestEntity, HitBox);
harvestPos = entityGetCenter(harvestPos, harvestHB);
f32 dst = Vector2Distance(harvestPos, mPos);
harvestables[numHarvestables++] = (EntityFloatPair) {
harvestEntity, dst
};
}
qsort(harvestables, numHarvestables, sizeof(*harvestables), entityFloatPairCmp);
i32 idxHarvestable = 0;
ecs_defer_begin(ECS);
ecs_iter_t it = ecs_query_iter(ECS, query);
while (ecs_query_next(&it)) {
for (i32 i = 0; i < it.count; i++) {
if (idxHarvestable >= numHarvestables)
break;
ecs_entity_t entity = it.entities[i];
EntityFloatPair harvestEntity = {0, 0};
while (idxHarvestable < numHarvestables) {
harvestEntity = harvestables[idxHarvestable++];
Harvestable *harvestable = ecs_get_mut(ECS, harvestEntity.entity, Harvestable);
if (harvestable->harvestCount >= harvestable->harvestLimit)
continue;
harvestable->harvestCount++;
break;
}
Position target = *ecs_get(ECS, harvestEntity.entity, Position);
HitBox targetHB = *ecs_get(ECS, harvestEntity.entity, HitBox);
target = entityGetCenter(target, targetHB);
f32 proximity = 4.0f;
Worker *worker = ecs_get_mut(ECS, entity, Worker);
worker->carryRes = resource.type;
setAIBehaviour(entity, game->BTs.workerHarvest, &(AIBlackboard) {
.as.worker = {
.harvestType = resource.type,
.harvestTarget = harvestEntity.entity,
.harvestPos = target,
},
.proximity = proximity,
});
}
}
ecs_defer_end(ECS);
}
return;
}
// Unit place position
Vector2 *positions = bzStackAlloc(&game->stackAlloc, sizeof(*positions) * numUnits);
Vector2 start = Vector2Zero();
Vector2 end = Vector2Zero();
if (isInputBtnDragged(input, actionBtn) || isInputBtnJustDragged(input, actionBtn)) {
start = input->mouseDownWorld;
end = input->mouseWorld;
} else {
start = end = input->mouseWorld;
f32 displace = 8 * numUnits;
displace = BZ_MIN(displace, 50.0f);
start.x -= displace;
end.x += displace + 2;
}
i32 placedUnits = placeUnits(numUnits, 6.0f, start, end, map, positions);
input->numUnits = placedUnits;
input->unitPlacePos = positions;
if (IsMouseButtonReleased(actionBtn)) {
// Note: We mustn't use ecs ecs_remove_all since this will also
// remove ongoing paths that are not part of this query.
ecs_defer_begin(ECS);
iterateSelectedUnits(query, iterRemovePaths);
ecs_defer_end(ECS);
EntityPosPair *entities = bzStackAlloc(&game->stackAlloc, sizeof(*entities) * input->numUnits);
ecs_iter_t it = ecs_query_iter(ECS, query);
i32 unitIdx = 0;
while (ecs_iter_next(&it)) {
for (i32 i = 0; i < it.count; i++) {
if (unitIdx >= input->numUnits)
break;
const ecs_entity_t entity = it.entities[i];
if (!ecs_has(ECS, entity, Position)) continue;
entities[unitIdx++] = (EntityPosPair) {
.entity = entity,
.pos = *ecs_get(ECS, entity, Position)
};
}
}
qsort(entities, unitIdx, sizeof(*entities), entityPosPairCmpZero);
qsort(input->unitPlacePos, unitIdx, sizeof(*input->unitPlacePos), vec2CmpZero);
for (i32 i = 0; i < unitIdx; i++) {
ecs_entity_t entity = entities[i].entity;
setAIBehaviour(entity, game->BTs.moveTo, &(AIBlackboard) {
.moveToPos = positions[i],
.proximity = 1.0f,
});
}
}
}
void updatePlayerInput() {
f32 dt = GetFrameTime();
Game *game = ecs_singleton_get_mut(ECS, Game);
InputState *input = ecs_singleton_get_mut(ECS, InputState);
input->numUnits = 0;
input->unitPlacePos = NULL;
const f32 maxZoom = 4.5f;
const f32 minZoom = 0.9f;
if (input->canUseKeyboard) {
float moveSpeed = 100.0f * dt * (1 + maxZoom - game->camera.zoom);
if (IsKeyDown(KEY_W)) game->camera.target.y -= moveSpeed;
if (IsKeyDown(KEY_S)) game->camera.target.y += moveSpeed;
if (IsKeyDown(KEY_A)) game->camera.target.x -= moveSpeed;
if (IsKeyDown(KEY_D)) game->camera.target.x += moveSpeed;
if (IsKeyDown(KEY_Q)) game->camera.rotation--;
if (IsKeyDown(KEY_E)) game->camera.rotation++;
if (IsKeyReleased(input->mapping.pauseBtn)) {
setScreen(game, SCREEN_PAUSE_MENU);
} else if (IsKeyReleased(input->mapping.backBtn)) {
if (input->state == INPUT_NONE) {
setScreen(game, SCREEN_PAUSE_MENU);
} else {
ecs_remove_all(ECS, Selected);
resetInputState(input);
}
}
}
// https://gamedev.stackexchange.com/questions/9330/zoom-to-cursor-calculation
float wheel = GetMouseWheelMove();
if (wheel != 0.0f && input->canUseMouse) {
const float zoomIncrement = 0.125f;
f32 oldZoom = game->camera.zoom;
f32 newZoom = oldZoom + wheel * zoomIncrement;
newZoom = Clamp(newZoom, minZoom, maxZoom);
Vector2 mouse = GetMousePosition();
f32 mapWidth = GetScreenWidth() / oldZoom;
f32 mapHeight = GetScreenHeight() / oldZoom;
f32 widthRatio = (mouse.x - (GetScreenWidth() / 2)) / GetScreenWidth();
f32 newMapWidth = GetScreenWidth() / newZoom;
f32 newMapHeight = GetScreenHeight() / newZoom;
f32 heightRatio = (mouse.y - (GetScreenHeight() / 2)) / GetScreenHeight();
game->camera.target.x += (mapWidth - newMapWidth) * widthRatio;
game->camera.target.y += (mapHeight - newMapHeight) * heightRatio;
game->camera.zoom = newZoom;
}
// Limit camera to world
{
const f32 zoom = game->camera.zoom;
const f32 width = GetScreenWidth() / zoom;
const f32 height = GetScreenHeight() / zoom;
const f32 mapWidth = game->map.width * game->map.tileWidth;
const f32 mapHeight = game->map.height * game->map.tileHeight;
game->camera.target.x = Clamp(game->camera.target.x,
width * 0.5f - game->map.tileWidth,
mapWidth - width + game->map.tileWidth + width * 0.5f);
game->camera.target.y = Clamp(game->camera.target.y,
height * 0.5f - game->map.tileHeight,
mapHeight - height + game->map.tileHeight + height * 0.5f);
}
if (!input->canUseMouse)
return;
BzTileMap *map = &game->map;
Vec2i tileXY = bzTileMapPosToTile(map, input->mouseWorld);
BzTile tileX = tileXY.x;
BzTile tileY = tileXY.y;
const MouseButton primaryBtn = input->mapping.primaryBtn;
const MouseButton secondaryBtn = input->mapping.secondaryBtn;
i32 count = ecs_query_entity_count(input->queries.selected);
//if (count > 0)
// input->state = INPUT_SELECTED_UNITS;
switch (input->state) {
case INPUT_NONE: {
inputPrimaryAction(game, input);
break;
}
case INPUT_BUILDING: {
if (input->building <= BUILDING_NONE || input->building >= BUILDING_COUNT ||
isInputBtnJustUp(input, input->mapping.secondaryBtn)) {
input->state = INPUT_NONE;
resetInputState(input);
return;
}
BzTile sizeX = 0, sizeY = 0;
getBuildingSize(input->building, &sizeX, &sizeY);
bool canPlace = canPlaceBuilding(game, input->building, tileX, tileY);
if (canPlace && isInputBtnDown(input, primaryBtn)) {
placeBuilding(game, input->building, tileX, tileY, game->player);
// Update player resources
i32 cost[RES_COUNT] = {0};
getBuildingCost(input->building, cost);
game->playerResources[game->player].wood -= cost[RES_WOOD];
game->playerResources[game->player].gold -= cost[RES_GOLD];
game->playerResources[game->player].food -= cost[RES_FOOD];
}
input->buildingCanPlace = canPlace;
input->buildingPos = (Vec2i) {tileX, tileY};
input->buildingSize = (Vec2i) {sizeX, sizeY};
break;
}
case INPUT_SELECTED_UNITS: {
inputPrimaryAction(game, input);
if (input->state != INPUT_SELECTED_UNITS) break;
inputUnitAction(game, input);
break;
}
case INPUT_SELECTED_OBJECT: {
inputPrimaryAction(game, input);
if (input->state != INPUT_SELECTED_OBJECT) break;
break;
}
case INPUT_SELECTED_BUILDING: {
inputPrimaryAction(game, input);
if (input->state != INPUT_SELECTED_BUILDING) break;
break;
}
}
}
void drawPlayerInputUIGround() {
const Game *game = ecs_singleton_get_mut(ECS, Game);
const InputState *input = ecs_singleton_get_mut(ECS, InputState);
const MouseButton primaryBtn = input->mapping.primaryBtn;
switch (input->state) {
case INPUT_BUILDING: {
const Color placeColor = input->buildingCanPlace ?
(Color) {0, 255, 0, 200} :
(Color) {255, 0, 0, 200};
const BzTile width = game->map.tileWidth;
const BzTile height = game->map.tileHeight;
DrawRectangleLines(input->buildingPos.x * width,
input->buildingPos.y * height,
input->buildingSize.x * width,
input->buildingSize.y * height, placeColor);
break;
}
default: break;
}
ecs_iter_t it = ecs_query_iter(ECS, input->queries.selected);
rlSetLineWidth(2.0f);
while (ecs_query_next(&it)) {
Position *pos = ecs_field(&it, Position, 1);
HitBox *hitbox = ecs_field(&it, HitBox , 2);
for (i32 i = 0; i < it.count; i++) {
ecs_entity_t entity = it.entities[i];
f32 radius = BZ_MAX(hitbox[i].width, hitbox[i].height);
Position center = entityGetCenter(pos[i], hitbox[i]);
radius *= 0.8f;
const f32 lineThickness = 1.0f;
if (ecs_has(ECS, entity, Building)) {
const f32 padding = 2.0f;
Rectangle bounds = {
pos[i].x + hitbox[i].x - padding,
pos[i].y - hitbox[i].height - padding,
hitbox[i].width + padding * 2,
hitbox[i].height + padding * 2,
};
DrawRectangleLinesEx(bounds, lineThickness, GREEN);
} else {
DrawRing(center, radius, radius + lineThickness, 0, 360, 12, GREEN);
}
}
}
if (input->unitPlacePos) {
for (i32 i = 0; i < input->numUnits; i++) {
DrawCircleV(input->unitPlacePos[i], 2.0f, RED);
}
}
}
void drawPlayerInputUI() {
const Game *game = ecs_singleton_get_mut(ECS, Game);
const InputState *input = ecs_singleton_get_mut(ECS, InputState);
const MouseButton primaryBtn = input->mapping.primaryBtn;
if (isInputBtnDragged(input, primaryBtn)) {
const Rectangle area = input->pickArea;
DrawRectangleLines(area.x, area.y, area.width, area.height, RED);
}
Vector2 point = input->mouseWorld;
Rectangle texRect = {0, 0, 0, 0};
switch (input->cursor) {
case CURSOR_COLLECT_WOOD:
texRect = getTextureRect(getItemTile(ITEM_AXE));
break;
case CURSOR_COLLECT_GOLD:
texRect = getTextureRect(getItemTile(ITEM_PICKAXE));
break;
case CURSOR_FARM:
texRect = getTextureRect(getItemTile(ITEM_SYTHE));
break;
case CURSOR_ATTACK:
texRect = getTextureRect(getItemTile(ITEM_CUTLASS));
break;
default: break;
}
if (texRect.width != 0 && texRect.height != 0) {
Texture tiles = game->tileset.tiles;
f32 size = 35.0 / game->camera.zoom;
Rectangle dst = {
point.x - size * 0.5f,
point.y - size * 0.5f,
size, size
};
point.y -= texRect.height;
DrawTexturePro(tiles, texRect, dst, Vector2Zero(), 0.0f, WHITE);
}
}
ecs_entity_t queryEntity(BzSpatialGrid *entityGrid, Vector2 point, ecs_entity_t tag) {
BzSpatialGridIter it = bzSpatialGridIter(entityGrid, point.x, point.y, 0.0f, 0.0f);
f32 closestDst = INFINITY;
ecs_entity_t closest = 0;
while (bzSpatialGridQueryNext(&it)) {
ecs_entity_t entity = *(ecs_entity_t *) it.data;
if (!ecs_is_alive(ECS, entity)) continue;
if (!ecs_has_id(ECS, entity, Selectable)) continue;
if (!ecs_has_id(ECS, entity, tag)) continue;
Vector2 pos;
Rectangle hitbox;
if (!entityGetHitBox(entity, &pos, &hitbox)) continue;
if (!CheckCollisionPointRec(point, hitbox)) continue;
f32 curDst = Vector2Distance(point, pos);
if (closestDst > curDst) {
closestDst = curDst;
closest = entity;
}
}
return closest;
}
bool selectEntity(BzSpatialGrid *entityGrid, Vector2 point, ecs_entity_t tag, Player player) {
ecs_remove_all(ECS, Selected);
const ecs_entity_t entity = queryEntity(entityGrid, point, tag);
if (!entity) return false;
if (player != PLAYER_COUNT) {
if (!ecs_has(ECS, entity, Owner)) return false;
Owner owner = *ecs_get(ECS, entity, Owner);
if (player != owner.player) return false;
}
ecs_add(ECS, entity, Selected);
return true;
}
void selectUnits(BzSpatialGrid *entityGrid, Rectangle area, Player player) {
ecs_remove_all(ECS, Selected);
BzSpatialGridIter it = bzSpatialGridIter(entityGrid, area.x, area.y, area.width, area.height);
while (bzSpatialGridQueryNext(&it)) {
ecs_entity_t entity = *(ecs_entity_t *) it.data;
if (player != PLAYER_COUNT) {
if (!ecs_has(ECS, entity, Owner)) continue;
Owner owner = *ecs_get(ECS, entity, Owner);
if (owner.player != player) continue;
}
if (!ecs_has_id(ECS, entity, ecs_id(Unit))) continue;
Rectangle hitbox;
if (!entityGetHitBox(entity, NULL, &hitbox)) continue;
if (!CheckCollisionRecs(area, hitbox)) continue;
ecs_add(ECS, entity, Selected);
}
}
static bool selectedAnyHasID(ecs_query_t *query, ecs_entity_t id) {
ecs_iter_t it = ecs_query_iter(ECS, query);
while (ecs_iter_next(&it)) {
for (i32 i = 0; i < it.count; i++) {
ecs_entity_t entity = it.entities[i];
if (ecs_has_id(ECS, entity, id)) {
ecs_iter_fini(&it);
return true;
}
}
}
return false;
}
void addEntityToInspected(ecs_entity_t entity, Game *game) {
bool alreadyInspecting = false;
for (i32 i = 0; i < bzArraySize(game->debug.inspecting); i++) {
if (game->debug.inspecting[i] == entity) {
alreadyInspecting = true;
break;
}
}
if (!alreadyInspecting)
bzArrayPush(game->debug.inspecting, entity);
}
static bool isUnitObstructed(f32 x, f32 y, BzTileMap *map) {
return bzTileMapHasAnyCollision(map, x / map->tileWidth, y / map->tileHeight);
}
static bool canPlaceUnit(Vector2 pos, f32 space, BzTileMap *map) {
for (i32 y = -1; y <= 1; y++) {
for (i32 x = -1; x <= 1; x++) {
if (isUnitObstructed(pos.x + x * space, pos.y + y * space, map))
return false;
}
}
return true;
}
static bool unitWithinMap(Vector2 pos, BzTileMap *map) {
f32 x = pos.x / map->tileWidth;
f32 y = pos.y / map->tileHeight;
return !(x < 0 || y < 0 || x >= map->width || y >= map->height);
}
i32 placeUnits(i32 numUnits, f32 unitSpacing, Vector2 start, Vector2 end, BzTileMap *map, Vector2 *outPlaces) {
i32 outIdx = 0;
f32 angle = Vector2Angle(start, end);
f32 lineLength = Vector2Distance(start, end);
Vector2 pos = Vector2Zero();
pos.x = unitSpacing;
for (i32 i = 0; i < numUnits; i++) {
if (pos.x + unitSpacing * 2.0f > lineLength) {
pos.x = unitSpacing;
pos.y += unitSpacing * 2.0f;
}
Vector2 unitPos = Vector2Add(start, Vector2Rotate(pos, angle));
bool withinMap = unitWithinMap(unitPos, map);
if (canPlaceUnit(unitPos, 4.0f, map) && withinMap) {
outPlaces[outIdx++] = unitPos;
} else if (withinMap) {
i--;
}
pos.x += unitSpacing * 2.0f;
}
return outIdx;
}
static void iterateSelectedUnits(ecs_query_t *query, void (*fn)(ecs_entity_t entity, Position *pos)) {
ecs_iter_t it = ecs_query_iter(ECS, query);
while (ecs_iter_next(&it)) {
Position *pos = ecs_field(&it, Position, 1);
for (i32 i = 0; i < it.count; i++) {
ecs_entity_t entity = it.entities[i];
fn(entity, pos + i);
}
}
}
static void iterRemovePaths(ecs_entity_t entity, Position *pos) {
ecs_remove(ECS, entity, Path);
}
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