* Set up a scene with an object, textures and a light. Create mipmaps so * that textures scale gracefully. Arrow keys move camera through scene. *
* GLApp initializes the LWJGL environment for OpenGL rendering, * ie. creates a window, sets the display mode, inits mouse and keyboard, * then runs a loop that calls draw(). *
* Special thanks to NeHe and Lionel Brits for the "Moving Through A 3D World" * tutorial (http://nehe.gamedev.net). *
* napier at potatoland dot org */ public class GLApp_DemoNavigation extends GLApp { // Handles for textures int sphereTextureHandle = 0; int groundTextureHandle = 0; // Lighting colors float faWhite[] = { 1.0f, 1.0f, 1.0f, 1.0f }; float faLightBlue[] = { 0.8f, 0.8f, .9f, 1f }; // Light position: if last value is 0, then this describes light direction. If 1, then light position. float lightPosition[]= { -2f, 2f, 2f, 1.0f }; // World coordinates of sphere float[] spherePos = {0f, 0f, 0f}; // Rotation of sphere float rotation=0f; // Camera position static float[] cameraPos = {0f,0f,20f}; float cameraRotation = 0f; // cursor will be drawn as a texture on a quad int cursorTextureHandle = 0; //------------------------------------------------------------------------ // Run main loop of application. Handle mouse and keyboard input. //------------------------------------------------------------------------ private GLApp_DemoNavigation() { } public static void main(String args[]) { GLApp_DemoNavigation demo = new GLApp_DemoNavigation(); demo.run(); // will call init(), render(), mouse functions } /** * Initialize the scene. Called by GLApp.run() */ public void setup() { // setup and enable perspective setPerspective(); // Create a point light (white) setLight( GL11.GL_LIGHT1, new float[] { 1.0f, 1.0f, 1.0f, 1.0f }, // diffuse color new float[] { .35f, 0.3f, 0.3f, 1.0f }, // ambient new float[] { 1.0f, 1.0f, 1.0f, 1.0f }, // specular lightPosition ); // position // Create a directional light (dark red, to simulate reflection off wood surface) setLight( GL11.GL_LIGHT2, new float[] { 0.3f, 0.15f, 0.1f, 1.0f }, // diffuse color new float[] { 0.0f, 0.0f, 0.0f, 1.0f }, // ambient new float[] { 0.0f, 0.0f, 0.0f, 1.0f }, // specular new float[] { 0.0f, -10f, 0.0f, 0f } ); // direction (pointing up) // material color setMaterial( new float[] { 0.9f, 0.9f, 0.9f, 1.0f }, // diffuse color new float[] { 0.9f, 0.9f, 0.9f, 1.0f }, // ambient new float[] { 1.0f, 1.0f, 1.0f, 1.0f }, // specular new float[] { 0.0f, 0.0f, 0.0f, 0.0f }, // emissive 100); // shininess // enable lighting and texture rendering GL11.glEnable(GL11.GL_LIGHTING); GL11.glEnable(GL11.GL_TEXTURE_2D); // Create texture and mipmap for sphere sphereTextureHandle = makeTexture("images/eye.jpg"); // Create texture and mipmap for ground plane groundTextureHandle = makeTexture("images/mahog_texture.jpg"); // Load a cursor image and make it a texture cursorTextureHandle = makeTexture("images/cursorCrosshair32.gif"); } /** * Render one frame. Called by GLApp.run(). */ public void draw() { rotation += .5f; // clear depth buffer and color GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT); // adjust camera position according to arrow key events setCameraPosition(); // select model view for subsequent transforms GL11.glMatrixMode(GL11.GL_MODELVIEW); GL11.glLoadIdentity(); // set the viewpoint GLU.gluLookAt(cameraPos[0], cameraPos[1], cameraPos[2], // where is the eye // look at a point directly in front of camera cameraPos[0]-(float)Math.sin(cameraRotation* PIOVER180), cameraPos[1], cameraPos[2]- (float) Math.cos(cameraRotation* PIOVER180), 0f, 1f, 0f); // which way is up // draw the ground plane GL11.glPushMatrix(); { GL11.glTranslatef(0f, -2.1f, 0f); // down a bit GL11.glScalef(10f, .1f, 10f); GL11.glBindTexture(GL11.GL_TEXTURE_2D, groundTextureHandle); renderCube(); } GL11.glPopMatrix(); // draw sphere at center GL11.glPushMatrix(); { GL11.glTranslatef(spherePos[0], spherePos[1], spherePos[2]); GL11.glRotatef(-90, 1, 0, 0); // rotate around X axis GL11.glRotatef(rotation, 0, 0, 1); // rotate around Y axis GL11.glBindTexture(GL11.GL_TEXTURE_2D, sphereTextureHandle); // activate texture renderSphere(); // draw the sphere } GL11.glPopMatrix(); // Place the light. Light will move with the rest of the scene GL11.glLight(GL11.GL_LIGHT1, GL11.GL_POSITION, allocFloats(lightPosition)); // draw the cursor on top of scene, in 2D drawCursor(cursorTextureHandle); } /** * set the field of view and view depth. */ public static void setPerspective() { // select projection matrix (controls perspective) GL11.glMatrixMode(GL11.GL_PROJECTION); GL11.glLoadIdentity(); // fovy, aspect ratio, zNear, zFar GLU.gluPerspective(30f, // zoom in or out of view aspectRatio, // shape of viewport rectangle .1f, // Min Z: how far from eye position does view start 500f); // max Z: how far from eye position does view extend // return to modelview matrix GL11.glMatrixMode(GL11.GL_MODELVIEW); } /** * Adjust the Camera position based on keyboard arrow key input. */ public void setCameraPosition() { // Turn left if (Keyboard.isKeyDown(Keyboard.KEY_LEFT)) { cameraRotation += 1.0f; } // Turn right if (Keyboard.isKeyDown(Keyboard.KEY_RIGHT)) { cameraRotation -= 1.0f; } // move forward in current direction if (Keyboard.isKeyDown(Keyboard.KEY_UP)) { cameraPos[0] -= (float) Math.sin(cameraRotation * PIOVER180) * .3f; cameraPos[2] -= (float) Math.cos(cameraRotation * PIOVER180) * .3f; } // move backward in current direction if (Keyboard.isKeyDown(Keyboard.KEY_DOWN)) { cameraPos[0] += (float) Math.sin(cameraRotation * PIOVER180) * .3f; cameraPos[2] += (float) Math.cos(cameraRotation * PIOVER180) * .3f; } // move camera down if (Keyboard.isKeyDown(Keyboard.KEY_PRIOR)) { cameraPos[1] += .3f; } // move camera up if (Keyboard.isKeyDown(Keyboard.KEY_NEXT)) { cameraPos[1] -= .3f; } } public void mouseMove(int x, int y) { } /** * Just for yacks, move sphere to mouse click position. */ public void mouseDown(int x, int y) { spherePos = getWorldCoordsAtScreen(x,y); } public void mouseUp(int x, int y) { } public void keyDown(int keycode) { } public void keyUp(int keycode) { } }