bullet_test.cpp

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// MIT License

// Copyright (c) 2019 Erin Catto

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

#include "test.h"

class BulletTest : public Test
{
public:

        BulletTest()
        {
                {
                        b2BodyDef bd;
                        bd.position.Set(0.0f, 0.0f);
                        b2Body* body = m_world->CreateBody(&bd);

                        b2EdgeShape edge;

                        edge.SetTwoSided(b2Vec2(-10.0f, 0.0f), b2Vec2(10.0f, 0.0f));
                        body->CreateFixture(&edge, 0.0f);

                        b2PolygonShape shape;
                        shape.SetAsBox(0.2f, 1.0f, b2Vec2(0.5f, 1.0f), 0.0f);
                        body->CreateFixture(&shape, 0.0f);
                }

                {
                        b2BodyDef bd;
                        bd.type = b2_dynamicBody;
                        bd.position.Set(0.0f, 4.0f);

                        b2PolygonShape box;
                        box.SetAsBox(2.0f, 0.1f);

                        m_body = m_world->CreateBody(&bd);
                        m_body->CreateFixture(&box, 1.0f);

                        box.SetAsBox(0.25f, 0.25f);

                        //m_x = RandomFloat(-1.0f, 1.0f);
                        m_x = 0.20352793f;
                        bd.position.Set(m_x, 10.0f);
                        bd.bullet = true;

                        m_bullet = m_world->CreateBody(&bd);
                        m_bullet->CreateFixture(&box, 100.0f);

                        m_bullet->SetLinearVelocity(b2Vec2(0.0f, -50.0f));
                }
        }

        void Launch()
        {
                m_body->SetTransform(b2Vec2(0.0f, 4.0f), 0.0f);
                m_body->SetLinearVelocity(b2Vec2_zero);
                m_body->SetAngularVelocity(0.0f);

                m_x = RandomFloat(-1.0f, 1.0f);
                m_bullet->SetTransform(b2Vec2(m_x, 10.0f), 0.0f);
                m_bullet->SetLinearVelocity(b2Vec2(0.0f, -50.0f));
                m_bullet->SetAngularVelocity(0.0f);

                extern B2_API int32 b2_gjkCalls, b2_gjkIters, b2_gjkMaxIters;
                extern B2_API int32 b2_toiCalls, b2_toiIters, b2_toiMaxIters;
                extern B2_API int32 b2_toiRootIters, b2_toiMaxRootIters;

                b2_gjkCalls = 0;
                b2_gjkIters = 0;
                b2_gjkMaxIters = 0;

                b2_toiCalls = 0;
                b2_toiIters = 0;
                b2_toiMaxIters = 0;
                b2_toiRootIters = 0;
                b2_toiMaxRootIters = 0;
        }

        void Step(Settings& settings) override
        {
                Test::Step(settings);

                extern B2_API int32 b2_gjkCalls, b2_gjkIters, b2_gjkMaxIters;
                extern B2_API int32 b2_toiCalls, b2_toiIters;
                extern B2_API int32 b2_toiRootIters, b2_toiMaxRootIters;

                if (b2_gjkCalls > 0)
                {
                        g_debugDraw.DrawString(5, m_textLine, "gjk calls = %d, ave gjk iters = %3.1f, max gjk iters = %d",
                                b2_gjkCalls, b2_gjkIters / float(b2_gjkCalls), b2_gjkMaxIters);
                        m_textLine += m_textIncrement;
                }

                if (b2_toiCalls > 0)
                {
                        g_debugDraw.DrawString(5, m_textLine, "toi calls = %d, ave toi iters = %3.1f, max toi iters = %d",
                                b2_toiCalls, b2_toiIters / float(b2_toiCalls), b2_toiMaxRootIters);
                        m_textLine += m_textIncrement;

                        g_debugDraw.DrawString(5, m_textLine, "ave toi root iters = %3.1f, max toi root iters = %d",
                                b2_toiRootIters / float(b2_toiCalls), b2_toiMaxRootIters);
                        m_textLine += m_textIncrement;
                }

                if (m_stepCount % 60 == 0)
                {
                        Launch();
                }
        }

        static Test* Create()
        {
                return new BulletTest;
        }

        b2Body* m_body;
        b2Body* m_bullet;
        float m_x;
};

static int testIndex = RegisterTest("Continuous", "Bullet Test", BulletTest::Create);