more work towards box2d benchmark

1 files changed, 106 insertions, 0 deletions

diff --git a/tests/box2d/HelloWorld/HelloWorld.cpp b/tests/box2d/HelloWorld/HelloWorld.cpp
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+++ b/tests/box2d/HelloWorld/HelloWorld.cpp
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+/*

+* Copyright (c) 2006-2007 Erin Catto http://www.box2d.org

+*

+* This software is provided 'as-is', without any express or implied

+* warranty.  In no event will the authors be held liable for any damages

+* arising from the use of this software.

+* Permission is granted to anyone to use this software for any purpose,

+* including commercial applications, and to alter it and redistribute it

+* freely, subject to the following restrictions:

+* 1. The origin of this software must not be misrepresented; you must not

+* claim that you wrote the original software. If you use this software

+* in a product, an acknowledgment in the product documentation would be

+* appreciated but is not required.

+* 2. Altered source versions must be plainly marked as such, and must not be

+* misrepresented as being the original software.

+* 3. This notice may not be removed or altered from any source distribution.

+*/

+

+#include <Box2D/Box2D.h>

+

+#include <cstdio>

+using namespace std;

+

+// This is a simple example of building and running a simulation

+// using Box2D. Here we create a large ground box and a small dynamic

+// box.

+// There are no graphics for this example. Box2D is meant to be used

+// with your rendering engine in your game engine.

+int main(int argc, char** argv)

+{

+	B2_NOT_USED(argc);

+	B2_NOT_USED(argv);

+

+	// Define the gravity vector.

+	b2Vec2 gravity(0.0f, -10.0f);

+

+	// Construct a world object, which will hold and simulate the rigid bodies.

+	b2World world(gravity);

+

+	// Define the ground body.

+	b2BodyDef groundBodyDef;

+	groundBodyDef.position.Set(0.0f, -10.0f);

+

+	// Call the body factory which allocates memory for the ground body

+	// from a pool and creates the ground box shape (also from a pool).

+	// The body is also added to the world.

+	b2Body* groundBody = world.CreateBody(&groundBodyDef);

+

+	// Define the ground box shape.

+	b2PolygonShape groundBox;

+

+	// The extents are the half-widths of the box.

+	groundBox.SetAsBox(50.0f, 10.0f);

+

+	// Add the ground fixture to the ground body.

+	groundBody->CreateFixture(&groundBox, 0.0f);

+

+	// Define the dynamic body. We set its position and call the body factory.

+	b2BodyDef bodyDef;

+	bodyDef.type = b2_dynamicBody;

+	bodyDef.position.Set(0.0f, 4.0f);

+	b2Body* body = world.CreateBody(&bodyDef);

+

+	// Define another box shape for our dynamic body.

+	b2PolygonShape dynamicBox;

+	dynamicBox.SetAsBox(1.0f, 1.0f);

+

+	// Define the dynamic body fixture.

+	b2FixtureDef fixtureDef;

+	fixtureDef.shape = &dynamicBox;

+

+	// Set the box density to be non-zero, so it will be dynamic.

+	fixtureDef.density = 1.0f;

+

+	// Override the default friction.

+	fixtureDef.friction = 0.3f;

+

+	// Add the shape to the body.

+	body->CreateFixture(&fixtureDef);

+

+	// Prepare for simulation. Typically we use a time step of 1/60 of a

+	// second (60Hz) and 10 iterations. This provides a high quality simulation

+	// in most game scenarios.

+	float32 timeStep = 1.0f / 60.0f;

+	int32 velocityIterations = 6;

+	int32 positionIterations = 2;

+

+	// This is our little game loop.

+	for (int32 i = 0; i < 60; ++i)

+	{

+		// Instruct the world to perform a single step of simulation.

+		// It is generally best to keep the time step and iterations fixed.

+		world.Step(timeStep, velocityIterations, positionIterations);

+

+		// Now print the position and angle of the body.

+		b2Vec2 position = body->GetPosition();

+		float32 angle = body->GetAngle();

+

+		printf("%4.2f %4.2f %4.2f\n", position.x, position.y, angle);

+	}

+

+	// When the world destructor is called, all bodies and joints are freed. This can

+	// create orphaned pointers, so be careful about your world management.

+

+	return 0;

+}