From 95e874e74e9710c1af70118e71f1b39a018a82d2 Mon Sep 17 00:00:00 2001
From: Niklas Birk <nikla.birk.nb@gmail.com>
Date: Tue, 17 Dec 2019 22:29:36 +0100
Subject: [PATCH] Init particle creation

---
 CMakeLists.txt   |  2 +-
 main.c           | 61 ++++++++++++++++++++++++++++++++++++++++++++-
 particlesystem.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++
 particlesystem.h | 55 +++++++++++++++++++++++++++-------------
 4 files changed, 164 insertions(+), 19 deletions(-)
 create mode 100644 particlesystem.c

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 27462cd..8b2f283 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,4 +3,4 @@ project(Informatikprojekt C)
 
 set(CMAKE_C_STANDARD 11)
 
-add_executable(Informatikprojekt main.c particlesystem.h)
\ No newline at end of file
+add_executable(Informatikprojekt main.c particlesystem.h particlesystem.c)
\ No newline at end of file
diff --git a/main.c b/main.c
index 7d38eaf..07b2934 100644
--- a/main.c
+++ b/main.c
@@ -1,7 +1,66 @@
 #include <stdio.h>
+#include <malloc.h>
+#include <stdlib.h>
+#include "particlesystem.h"
+
+char *printVector(vector3f *v);
+void printParticle(particle *v);
+void printEmitter(emitter *e);
+void initRandomParticles(emitter *e);
 
 int main()
 {
-    printf("Hello, World!\n");
+    vector3f *epos = initVector3f(0, 0, 0);
+    emitter *e = initEmitter(epos, 10);
+
+    initRandomParticles(e);
+
+    printEmitter(e);
+
+    for (int i = 0; i < e->pamount; i++)
+    {
+        free((e->particles)[i]);
+    }
+
+    free(epos);
+    free(e);
     return 0;
 }
+
+void initRandomParticles(emitter *e)
+{
+    for (int i = 0; i < e->pamount; i++)
+    {
+        vector3f *pos = initVector3f(e->position->x, e->position->y, e->position->z);
+        vector3f *dir = initVector3f((float) rand() / RAND_MAX, (float) rand() / RAND_MAX, (float) rand() / RAND_MAX);
+        (e->particles)[i] = initParticle(pos, dir);
+    }
+}
+
+char *printVector(vector3f *v)
+{
+    char *c = malloc(100);
+    sprintf(c, "(%f, %f, %f)", v->x, v->y, v->z);
+    return c;
+}
+
+void printParticle(particle *v)
+{
+    printf("   Particle {\n");
+    printf("      position = %s", printVector(v->position));
+    printf("\n      direction = %s", printVector(v->direction));
+    printf("\n   }");
+}
+
+void printEmitter(emitter *e)
+{
+    printf("Emitter {\n");
+
+    for (int i = 0; i < e->pamount; i++)
+    {
+        printParticle((e->particles)[i]);
+        printf("\n");
+    }
+
+    printf("\n}");
+}
diff --git a/particlesystem.c b/particlesystem.c
new file mode 100644
index 0000000..0008f6c
--- /dev/null
+++ b/particlesystem.c
@@ -0,0 +1,65 @@
+#include "particlesystem.h"
+#include <malloc.h>
+
+/*
+ * Initializes a particle
+ */
+particle *initParticle(vector3f *pos, vector3f *dir)
+{
+    particle *p = malloc(sizeof(particle));
+    p->position = pos;
+    p->direction = dir;
+    return p;
+}
+
+/*
+ * Initializes an emitter
+ */
+emitter *initEmitter(vector3f *pos, int pamount)
+{
+    emitter *e = malloc(sizeof(emitter));
+    e->position = pos;
+    e->particles = malloc(sizeof(particle *) * pamount);
+    e->pamount = pamount;
+    return e;
+}
+
+/*
+ * Initializes a particle system
+ */
+particle_system *initParticleSystem(int eamount)
+{
+    particle_system *ps = malloc(sizeof(particle_system));
+    ps->emitters = malloc(sizeof(emitter *) * eamount);
+    ps->eamount = eamount;
+    return ps;
+}
+
+/*
+ * Updates particles
+ */
+int updateParticles(float dt, particle_system *particleSystem)
+{
+
+}
+
+/*
+ * Draws particles
+ */
+int drawParticles(particle_system *particleSystem)
+{
+
+}
+
+/*
+ * Initializes a vector
+ * For that it allocates memory that must be freed later
+ */
+vector3f *initVector3f(float x, float y, float z)
+{
+    vector3f *vector = malloc(sizeof(vector3f));
+    vector->x = x;
+    vector->y = y;
+    vector->z = z;
+    return vector;
+}
\ No newline at end of file
diff --git a/particlesystem.h b/particlesystem.h
index 3256cf7..5f99776 100644
--- a/particlesystem.h
+++ b/particlesystem.h
@@ -1,49 +1,70 @@
 /*
  * A vector with three floats
  */
-struct vector3f
+typedef struct vector3f
 {
     float x;
     float y;
     float z;
-};
+} vector3f;
 
 /*
  * A particle has a position and a direction
  */
-struct particle
+typedef struct particle
 {
-    struct vector3f position;
-    struct vector3f direction;
-};
+    vector3f *position;
+    vector3f *direction;
+} particle;
 
 /*
  * An emitter has a position and contains an array of particles
  */
-struct emitter
+typedef struct emitter
 {
-    struct vector3f position;
-    struct particle *particles;
+    vector3f *position;
+    particle **particles;
     int pamount;
-};
+} emitter;
 
 /*
  * A particle system consists of one or more emitter
  */
-struct particle_system
+typedef struct particle_system
 {
-    struct emitter *emitters;
+    emitter **emitters;
     int eamount;
-};
+} particle_system;
 
 /*
- *
+ * Initializes a particle
  */
-int initParticle(struct vector3f pos, struct vector3f dir);
+particle *initParticle(vector3f *pos, vector3f *dir);
 
 /*
- *
+ * Initializes an emitter
  */
-int initVector3f(int x, int y, int z);
+emitter *initEmitter(vector3f *pos, int pamount);
+
+/*
+ * Initializes a particle system
+ */
+particle_system *initParticleSystem(int eamount);
+
+/*
+ * Updates particle
+ */
+int updateParticles(float dt, particle_system *particleSystem);
+
+/*
+ * Updates particle
+ */
+int drawParticles(particle_system *particleSystem);
+
+/*
+ * Initializes a vector
+ * For that it allocates memory that must be freed later
+ */
+vector3f *initVector3f(float x, float y, float z);