Hook Particle to the other systems

Had to manually merge a change set for this

app.c

@@ -3,6 +3,7 @@
 #include "camera.h"
 #include "entity.h"
 #include "input.h"
+#include "particle.h"
 #include "physics.h"
 #include "player.h"
 #include "types.h"
@@ -18,6 +19,7 @@ App *app_NewApp() {
 	app->player   = player_NewSystem(app);
 	app->entity   = entity_NewSystem(app);
 	app->camera   = camera_NewSystem(app);
+	app->particle = particle_NewSystem(app);
 
 	app->wantQuit = false;
 
@@ -68,6 +70,7 @@ void app_DeleteApp(App *app) {
 
 
 void app_Advance(App *app, Duration deltaTime) {
+	particle_Advance(app->particle, deltaTime);
 	input_Advance(app->input);
 	player_Advance(app->player, deltaTime);
 	physics_Advance(app->physics, deltaTime);

app.h

@@ -5,6 +5,7 @@
 #include "player.h"
 #include "input.h"
 #include "camera.h"
+#include "particle.h"
 #include "types.h"
 #include "util/vector.h"
 
@@ -19,6 +20,7 @@ typedef struct _App {
 	System_Input    *input;
 	System_Entity   *entity;
 	System_Camera   *camera;
+	System_Particle *particle;
 
 	bool wantQuit;
 } App;

app_debug.c

@@ -1,6 +1,7 @@
 
 #include "app.h"
 #include "types.h"
+#include "util/tree.h"
 #include "util/vector.h"
 
 #include <stdio.h>
@@ -42,6 +43,10 @@ void app_DebugText(App *app, vector_Vector *vec_string) {
 		center.x, center.y,
 		size.x, size.y);
 	PUSH_STRING(buf);
+	snprintf(
+		buf, sizeof(buf) - 1,
+		"Particle count: %d\n", tree_Count(app->particle->parts));
+	PUSH_STRING(buf);
 
 	char zero = '\0';
 	vector_Push(vec_string, &zero);

app_render.cpp

@@ -1,6 +1,7 @@
 
 #include "app.h"
 #include "camera.h"
+#include "particle.h"
 #include "physics.h"
 #include "easyx.h"
 #include "util/tree.h"
@@ -46,5 +47,8 @@ void app_Render(App *app) {
 	setbkcolor(RGB(0, 0, 0));
 	render_SetModes(mode_rotate, since);
 	render_FillCircleW(app, vec2(200, 100), 20);
+
+	// Draw particles
+	particle_Render(app->particle);
 }
 }

player.c

@@ -3,7 +3,9 @@
 #include "entity.h"
 #include "app.h"
 #include "input.h"
+#include "particle.h"
 
+#include "render_util.h"
 #include "types.h"
 #include "util/assert.h"
 #include <stdlib.h>
@@ -51,62 +53,77 @@ static double   walkSpeed = 300.0, jumpSpeed = 800.0, dashSpeed = 1500.0;
 static int      airjumpCount = 1, airdashCount = 1;
 static Duration dashLength = {.microseconds = 150000}, dashCooldown = {.microseconds = 400000};
 
+static Duration  emitCooldown = {.microseconds = 200000};
+static TimePoint lastEmit;
+
 void player_Advance(System_Player *sys, Duration deltaTime) {
 	if (!sys->player)
 		return;
 	// The bulk of player logic right here
 	System_Input     *input = sys->super->input;
+	Component_Player *p     = sys->player;
 
-	if (sys->player->faceDirection != 1 && sys->player->faceDirection != -1)
-		sys->player->faceDirection = 1; // Face right by default
+	if (p->faceDirection != 1 && p->faceDirection != -1)
+		p->faceDirection = 1; // Face right by default
 
 
 	double targetVecX = 0.0;
 	// Move left/right
 	if (input_IsPressed(input->keys[input_Key_Left])) {
-		sys->player->faceDirection = -1;
+		p->faceDirection = -1;
 		targetVecX += -walkSpeed;
 	}
 	if (input_IsPressed(input->keys[input_Key_Right])) {
-		sys->player->faceDirection = 1;
+		p->faceDirection = 1;
 		targetVecX += walkSpeed;
 	}
-	sys->player->super->position->velocity.x = targetVecX;
+	p->super->position->velocity.x = targetVecX;
 
 
 	// Jump
-	if (sys->player->onGround)
-		sys->player->jumpCount = 0;
-	if (sys->super->input->keys[input_Key_Jump] == JustPressed ||
-		(sys->super->input->keys[input_Key_Jump] == Pressed && dabs(sys->player->super->position->velocity.y) < 5)) {
-		if (sys->player->onGround || sys->player->jumpCount < airjumpCount) {
-			sys->player->storedSpeedY = -jumpSpeed;
-			if (!sys->player->onGround) // Took the second clause, airjumped
-				sys->player->jumpCount++;
+	if (p->onGround)
+		p->jumpCount = 0;
+	if (input->keys[input_Key_Jump] == JustPressed ||
+		(input->keys[input_Key_Jump] == Pressed && dabs(p->super->position->velocity.y) < 5)) {
+		if (p->onGround || p->jumpCount < airjumpCount) {
+			p->storedSpeedY = -jumpSpeed;
+			if (!p->onGround) // Took the second clause, airjumped
+				p->jumpCount++;
 		}
 	}
 
 	// Dash
-	if (sys->player->onGround)
-		sys->player->dashCount = 0;
+	if (p->onGround)
+		p->dashCount = 0;
 	if (input_IsPressed(input->keys[input_Key_Dash]) &&
-		(sys->player->onGround || sys->player->dashCount < airdashCount) &&
-		time_Since(sys->player->lastDash).microseconds > dashCooldown.microseconds) {
-		sys->player->lastDash = time_Now();
-		if (!sys->player->onGround)
-			sys->player->dashCount++;
+		(p->onGround || p->dashCount < airdashCount) &&
+		time_Since(p->lastDash).microseconds > dashCooldown.microseconds) {
+		p->lastDash = time_Now();
+		if (!p->onGround)
+			p->dashCount++;
 	}
 	// Am I dashing right now?
-	if (time_Since(sys->player->lastDash).microseconds < dashLength.microseconds) {
-		sys->player->super->position->velocity.x += sys->player->faceDirection * dashSpeed;
-		sys->player->super->position->velocity.y = 0;
+	if (time_Since(p->lastDash).microseconds < dashLength.microseconds) {
+		p->super->position->velocity.x += p->faceDirection * dashSpeed;
+		p->super->position->velocity.y = 0;
 	} else { // Release the stored Y speed
-		sys->player->super->position->velocity.y += sys->player->storedSpeedY;
-		sys->player->storedSpeedY = 0;
+		p->super->position->velocity.y += p->storedSpeedY;
+		p->storedSpeedY = 0;
 	}
 
 
 	// Check OnGround again
 	if (dabs(sys->player->super->position->velocity.y) > EPS)
 		sys->player->onGround = false;
+
+
+	// Particles
+	if (time_Since(lastEmit).microseconds > emitCooldown.microseconds) {
+		lastEmit = time_Now();
+		particle_Emit(
+			sys->super->particle,
+			vec2_Add(p->super->position->position, vec2(0, -p->super->hitbox->box.size.y)),
+			vec2(0, -100), 2, 6, 6,
+			duration_FromSeconds(0), &render_ModeDefault);
+	}
 }

types.c

@@ -2,6 +2,7 @@
 #include "types.h"
 #include <math.h>
 #include <stdio.h>
+#include <stdlib.h>
 #ifdef WIN32_LEAN_AND_MEAN
 #undef WIN32_LEAN_AND_MEAN
 #endif
@@ -39,6 +40,10 @@ Vec2 vec2_Scale(Vec2 v, double scale) {
 	return result;
 }
 
+Vec2 vec2_Random(double minX, double maxX, double minY, double maxY) {
+}
+
+
 bool box2_Intersects(const Box2 x, const Box2 y, Box2 *out_intersection) {
 	// Compute the min and max of the first rectangle on both axes
 	const double r1MinX = dmin(x.lefttop.x, x.lefttop.x + x.size.x);

types.h

@@ -37,6 +37,8 @@ Vec2 vec2_Add(Vec2 x, Vec2 y);
 Vec2 vec2_Minus(Vec2 pos, Vec2 neg);
 Vec2 vec2_Scale(Vec2 v, double scale);
 
+Vec2 vec2_Random(double minX, double maxX, double minY, double maxY);
+
 
 // A 2d box of double.
 typedef struct {

util/tree.c

@@ -174,3 +174,13 @@ tree_Node *tree_Node_Previous(tree_Node *node) {
 		return result->father;
 	}
 }
+
+
+size_t tree_Count(tree_Tree *tree) {
+	size_t cnt = 0;
+	for (tree_Node *i = tree_FirstNode(tree);
+		 i != NULL;
+		 i = tree_Node_Next(i))
+		cnt++;
+	return cnt;
+}

util/tree.h

@@ -69,6 +69,9 @@ tree_Node *tree_Node_Next(tree_Node *node);
 // Node_Previous returns the previous node. Returns NULL if first.
 tree_Node *tree_Node_Previous(tree_Node *node);
 
+// Count walks the tree and counts how many nodes are there in the tree.
+size_t tree_Count(tree_Tree *tree);
+
 
 #ifdef __cplusplus
 }