add RenderInstancingDemo

allow to use OpenGL2 or OpenGL3 in same binary (will add command-line switch)

Demos3/Geometry/RenderInstancingDemo.h

@@ -0,0 +1,131 @@
+#ifndef RENDER_INSTANCING_DEMO_H
+#define RENDER_INSTANCING_DEMO_H
+
+#include "Bullet3AppSupport/BulletDemoInterface.h"
+#include "OpenGLWindow/CommonGraphicsApp.h"
+#include "Bullet3Common/b3Quaternion.h"
+
+
+
+///quick demo showing the right-handed coordinate system and positive rotations around each axis
+class RenderInstancingDemo : public BulletDemoInterface
+{
+    CommonGraphicsApp* m_app;
+    float m_x;
+    float m_y;
+    float m_z;
+	b3AlignedObjectArray<int> m_movingInstances;
+	enum
+	{
+		numCubesX = 20,
+		numCubesY = 20
+	};
+public:
+    
+    RenderInstancingDemo(CommonGraphicsApp* app)
+    :m_app(app),
+    m_x(0),
+    m_y(0),
+	m_z(0)
+    {
+		m_app->setUpAxis(2);
+        
+		 {
+             b3Vector3 extents=b3MakeVector3(100,100,100);
+             extents[m_app->getUpAxis()]=1;
+             
+			 int xres = 20;
+			 int yres = 20;
+			 
+			 b3Vector4 color0=b3MakeVector4(0.1, 0.1, 0.1,1);
+			 b3Vector4 color1=b3MakeVector4(0.6, 0.6, 0.6,1);
+            m_app->registerGrid(xres, yres, color0, color1);
+        }
+		 
+        {
+            int boxId = m_app->registerCubeShape(0.1,0.1,0.1);
+           
+            
+            
+            for (int i=-numCubesX/2;i<numCubesX/2;i++)
+            {
+                for (int j = -numCubesY/2;j<numCubesY/2;j++)
+                {
+                    b3Vector3 pos=b3MakeVector3(i,j,j);
+                    pos[app->getUpAxis()] = 1;
+                    b3Quaternion orn(0,0,0,1);
+                    b3Vector4 color=b3MakeVector4(0.3,0.3,0.3,1);
+                    b3Vector3 scaling=b3MakeVector3(1,1,1);
+                   int instanceId = m_app->m_renderer->registerGraphicsInstance(boxId,pos,orn,color,scaling);
+				   m_movingInstances.push_back(instanceId);
+                }
+            }
+        }
+
+		 m_app->m_renderer->writeTransforms();
+    }
+    virtual ~RenderInstancingDemo()
+    {
+        m_app->m_renderer->enableBlend(false);
+    }
+
+    static BulletDemoInterface*    CreateFunc(CommonGraphicsApp* app)
+    {
+        return new RenderInstancingDemo(app);
+    }
+    virtual void physicsDebugDraw(int debugDrawMode)
+    {
+        
+    }
+    virtual void    initPhysics()
+    {
+    }
+    virtual void    exitPhysics()
+    {
+        
+    }
+    virtual void	stepSimulation(float deltaTime)
+    {
+        m_x+=0.01f;
+        m_y+=0.01f;
+		m_z+=0.01f;
+		int index=0;
+        for (int i=-numCubesX/2;i<numCubesX/2;i++)
+        {
+            for (int j = -numCubesY/2;j<numCubesY/2;j++)
+            {
+                b3Vector3 pos=b3MakeVector3(i,j,j);
+                pos[m_app->getUpAxis()] = 1+1*b3Sin(m_x+i-j);
+                float orn[4]={0,0,0,1};
+                m_app->m_renderer->writeSingleInstanceTransformToCPU(pos,orn,m_movingInstances[index++]);
+            }
+        }
+        m_app->m_renderer->writeTransforms();
+        
+    }
+    virtual void	renderScene()
+    {
+		m_app->m_renderer->renderScene();
+    }
+
+	
+    virtual void	physicsDebugDraw()
+    {
+      		
+    }
+    virtual bool	mouseMoveCallback(float x,float y)
+    {
+		return false;   
+    }
+    virtual bool	mouseButtonCallback(int button, int state, float x, float y)
+    {
+        return false;   
+    }
+    virtual bool	keyboardCallback(int key, int state)
+    {
+        return false;   
+    }
+    
+};
+#endif //RENDER_INSTANCING_DEMO_H
+