From c3453fedbd270afe8d9dfc7f288ea7205f029b86 Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Sat, 29 Feb 2020 00:36:43 +0100
Subject: Begin on physics

---
 README.md                              | 11 +++++-----
 include/Physics/Physics.hpp            |  8 +++++++
 project.conf                           |  6 +++++
 src/Physics/Physics.cpp                | 40 ++++++++++++++++++++++++++++++++++
 src/RenderBackend/OpenGL/Texture2D.cpp |  1 +
 5 files changed, 61 insertions(+), 5 deletions(-)
 create mode 100644 include/Physics/Physics.hpp
 create mode 100644 src/Physics/Physics.cpp

diff --git a/README.md b/README.md
index d7dcf18..4261947 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,10 @@
 ## Prerequisite
-glfw3
-glew
-glm
-sibs (https://github.com/DEC05EBA/sibs)
+`glfw3`, `glew`, `glm`, [sibs](https://github.com/DEC05EBA/sibs) and a C++14 compiler.
 
 # TODO
 * Make use shader a no-op if already in use.
-* Render vertices using glDrawElements instead of glDrawArrays.
\ No newline at end of file
+* Render vertices using glDrawElements instead of glDrawArrays.
+* Use opencl with bullet instead of using cpu.
+* Remove obj loader and create an external program that uses assimp to convert different models to an amalgine specific binary file format.
+This will allow amalgine to easily load models and animations with minimal code, no matter what the original format is.
+This will make amalgine simpler, more efficient and use less memory.
\ No newline at end of file
diff --git a/include/Physics/Physics.hpp b/include/Physics/Physics.hpp
new file mode 100644
index 0000000..9aec701
--- /dev/null
+++ b/include/Physics/Physics.hpp
@@ -0,0 +1,8 @@
+#pragma once
+
+namespace amalgine {
+    class Physics {
+    public:
+        Physics();
+    };
+}
\ No newline at end of file
diff --git a/project.conf b/project.conf
index 12fea06..150bfa7 100644
--- a/project.conf
+++ b/project.conf
@@ -4,8 +4,14 @@ type = "executable"
 version = "0.1.0"
 platforms = ["linux32", "linux64", "win64"]
 
+[lang.cpp]
+version = "c++14"
+
 [dependencies]
 glfw3 = "3.2.1"
 glew = "2.1.0"
 glm = "0.9.8"
+# TODO: Remove this and use a simple jpg and png loader
 soil = "1.16.0"
+# TODO: Add support for vcpkg in sibs and use that instead
+bullet = "2"
\ No newline at end of file
diff --git a/src/Physics/Physics.cpp b/src/Physics/Physics.cpp
new file mode 100644
index 0000000..fb00d1d
--- /dev/null
+++ b/src/Physics/Physics.cpp
@@ -0,0 +1,40 @@
+#include "../../include/Physics/Physics.hpp"
+
+#include <btBulletDynamicsCommon.h>
+
+// TODO: Figure out how to process physics in another thread. Should it be done simply by
+// calling stepSimulation in another thread?
+
+static void physics_update_callback(btDynamicsWorld *dynamics_world, btScalar time_step) {
+    btDispatcher *dispatcher = dynamics_world->getDispatcher();
+    int num_manifolds = dispatcher->getNumManifolds();
+    for(int i = 0; i < num_manifolds; ++i) {
+        btPersistentManifold *contact_manifold = dispatcher->getManifoldByIndexInternal(i);
+        {
+            // The bodies that collided
+            const btCollisionObject *obj_this = contact_manifold->getBody0();
+            const btCollisionObject *obj_other = contact_manifold->getBody1();
+        }
+        int num_contacts = contact_manifold->getNumContacts();
+        for(int j = 0; j < num_contacts; ++j) {
+            btManifoldPoint &pt = contact_manifold->getContactPoint(j);
+            const btVector3 &pt_this = pt.getPositionWorldOnA();
+            const btVector3 &pt_other = pt.getPositionWorldOnB();
+            const btVector3 &normal_on_other = pt.m_normalWorldOnB;
+        }
+    }
+}
+
+namespace amalgine {
+    Physics::Physics() {
+        btDefaultCollisionConfiguration *collision_configuration = new btDefaultCollisionConfiguration();
+        btCollisionDispatcher *dispatcher = new btCollisionDispatcher(collision_configuration);
+        btBroadphaseInterface *overlapping_pair_cache = new btDbvtBroadphase();
+        btSequentialImpulseConstraintSolver *solver = new btSequentialImpulseConstraintSolver();
+        btDiscreteDynamicsWorld *dynamics_world = new btDiscreteDynamicsWorld(dispatcher, overlapping_pair_cache, solver, collision_configuration);
+        const float gravity = -10.0f;
+        dynamics_world->setGravity(btVector3(0.0f, gravity, 0.0f));
+        dynamics_world->setInternalTickCallback(physics_update_callback);
+        //dynamics_world->debugDrawWorld();
+    }
+}
\ No newline at end of file
diff --git a/src/RenderBackend/OpenGL/Texture2D.cpp b/src/RenderBackend/OpenGL/Texture2D.cpp
index 089a5f1..fa84353 100644
--- a/src/RenderBackend/OpenGL/Texture2D.cpp
+++ b/src/RenderBackend/OpenGL/Texture2D.cpp
@@ -67,6 +67,7 @@ namespace amalgine {
         glBindTexture(GL_TEXTURE_2D, texture_ref);
         //output_gl_error("bind texture");
 
+        // TODO: Take into account GL_ARB_texture_non_power_of_two and resize the image to power of two
         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, image->getWidth(), image->getHeight(), 0, GL_RGB, GL_UNSIGNED_BYTE, image->getData());
         //output_gl_error("set texture");
         
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