OpenGL实现的烟花粒子系统（Android）

package night.fireworks; import java.nio.FloatBuffer; import java.nio.IntBuffer; import java.util.Random; import javax.microedition.khronos.egl.EGLConfig; import javax.microedition.khronos.opengles.GL10; import android.opengl.GLUtils; import android.opengl.GLSurfaceView.Renderer; import android.util.Log; import android.view.KeyEvent; public class GLRender implements Renderer { final static int MAX_FIRE = 5; boolean rainbow = true; /* Toggle rainbow effect */ Random random = new Random(); float slowdown = 0.5f; /* Slow Down Particles */ float xspeed = 1; /* Base X Speed (To Allow Keyboard Direction Of Tail) */ float yspeed = 3; /* Base Y Speed (To Allow Keyboard Direction Of Tail) */ float zoom = -30.0f; /* Used To Zoom Out */ //int loop; /* Misc Loop Variable */ int col = 0; /* Current Color Selection */ int delay; /* Rainbow Effect Delay */ int texture; /* Storage For Our Particle Texture */ int texPearl; /* Rainbow of colors */ static float colors[][]= { {1.0f, 0.5f, 0.5f}, {1.0f, 0.75f, 0.5f}, {1.0f, 1.0f, 0.5f}, {0.75f, 1.0f, 0.5f}, {0.5f, 1.0f, 0.5f}, {0.5f, 1.0f, 0.75f}, {0.5f, 1.0f, 1.0f}, {0.5f, 0.75f, 1.0f}, {0.5f, 0.5f, 1.0f}, {0.75f, 0.5f, 1.0f}, {1.0f, 0.5f, 1.0f}, {1.0f, 0.5f, 0.75f} }; /* Our beloved array of particles */ Fire fire[] = new Fire[MAX_FIRE]; @Override public void onDrawFrame(GL10 gl) { FloatBuffer vertices = FloatBuffer.wrap(new float[12]); FloatBuffer texcoords = FloatBuffer.wrap(new float[8]); /* Clear The Screen And The Depth Buffer */ gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT); /* Enable vertices and texcoords arrays */ gl.glEnableClientState(GL10.GL_VERTEX_ARRAY); gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY); /* Set pointers to vertices and texcoords */ gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertices); gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, texcoords); gl.glBindTexture(GL10.GL_TEXTURE_2D, texPearl); gl.glPushMatrix(); gl.glLoadIdentity(); gl.glColor4f(1.0f, 1.0f, 1.0f, 1.0f); gl.glOrthof(0.0f, 1.0f, 0.0f, 1.0f, 1.0f, 200.0f); texcoords.clear(); vertices.clear(); /* Top Right */ texcoords.put(1.0f); texcoords.put(0.0f); vertices.put(1.0f); vertices.put(1.0f); vertices.put(1.0f); /* Top Left */ texcoords.put(0.0f); texcoords.put(0.0f); vertices.put(0.0f); vertices.put(1.0f); vertices.put(1.0f); /* Bottom Right */ texcoords.put(1.0f); texcoords.put(1.0f); vertices.put(1.0f); vertices.put(0.0f); vertices.put(1.0f); /* Bottom Left */ texcoords.put(0.0f); texcoords.put(1.0f); vertices.put(0.0f); vertices.put(0.0f); vertices.put(1.0f); gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, 4); gl.glPopMatrix(); gl.glBindTexture(GL10.GL_TEXTURE_2D, texture); for(int loop = 0; loop < MAX_FIRE; loop++) { for (int loop1 = 0; loop1 < Fire.MAX_PARTICLES; loop1++) { for(int loop2 = 0; loop2 < Fire.MAX_TAIL; loop2++) { float x = fire[loop].particle[loop1][loop2].x; float y = fire[loop].particle[loop1][loop2].y; float z = fire[loop].particle[loop1][loop2].z; float dt = 1 - (float)loop2/Fire.MAX_TAIL; gl.glColor4f(fire[loop].particle[loop1][0].r, fire[loop].particle[loop1][0].g, fire[loop].particle[loop1][0].b, fire[loop].life * dt); float size = 0.5f * dt; texcoords.clear(); vertices.clear(); texcoords.put(1.0f); texcoords.put(1.0f); vertices.put(x + size); vertices.put(y + size); vertices.put(z); texcoords.put(0.0f); texcoords.put(1.0f); vertices.put(x - size); vertices.put(y + size); vertices.put(z); texcoords.put(1.0f); texcoords.put(0.0f); vertices.put(x + size); vertices.put(y - size); vertices.put(z); texcoords.put(0.0f); texcoords.put(0.0f); vertices.put(x - size); vertices.put(y - size); vertices.put(z); /* Build Quad From A Triangle Strip */ gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, 4); } // update position for(int loop2 = Fire.MAX_TAIL-1; loop2 > 0; loop2--) { fire[loop].particle[loop1][loop2].x = fire[loop].particle[loop1][loop2-1].x; fire[loop].particle[loop1][loop2].y = fire[loop].particle[loop1][loop2-1].y; fire[loop].particle[loop1][loop2].z = fire[loop].particle[loop1][loop2-1].z; } //for loop2 end fire[loop].particle[loop1][0].x += fire[loop].particle[loop1][0].xs / (slowdown * 1000); fire[loop].particle[loop1][0].y += fire[loop].particle[loop1][0].ys / (slowdown * 1000); fire[loop].particle[loop1][0].z += fire[loop].particle[loop1][0].zs / (slowdown * 1000); // update y speed float yd = fire[loop].particle[loop1][0].yg / (slowdown * 500); fire[loop].particle[loop1][0].ys += yd; if (fire[loop].particle[loop1][0].up && fire[loop].particle[loop1][0].ys < -yd) { fire[loop].particle[loop1][0].up = false; int color = rand()%colors.length; fire[loop].particle[loop1][0].r = colors[color][0]; fire[loop].particle[loop1][0].g = colors[color][1]; fire[loop].particle[loop1][0].b = colors[color][2]; // x-z speed double radian = 3.14159*loop1*15.0/180.0;//loop1*15.0/(2*3.14159); fire[loop].particle[loop1][0].xs = (float)(fire[loop].rad*Math.sin(radian)); fire[loop].particle[loop1][0].zs = (float)(fire[loop].rad*Math.cos(radian)); } } fire[loop].life -= fire[loop].fade; if (fire[loop].life < 0) { resetFire(loop); } } /* Disable texcoords and vertices arrays */ gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY); gl.glDisableClientState(GL10.GL_VERTEX_ARRAY); /* Draw it to the screen */ gl.glFinish(); } @Override public void onSurfaceChanged(GL10 gl, int width, int height) { /* Height / width ration */ float ratio; /* Protect against a divide by zero */ if (height == 0) { height = 1; } ratio = (float)width/(float)height; /* Setup our viewport. */ gl.glViewport(0, 0, (int)width, (int)height); /* change to the projection matrix and set our viewing volume. */ gl.glMatrixMode(GL10.GL_PROJECTION); gl.glLoadIdentity(); /* Set our perspective */ gl.glFrustumf(-ratio, ratio, -1, 1, 1.0f, 200.0f); /* Make sure we're chaning the model view and not the projection */ gl.glMatrixMode(GL10.GL_MODELVIEW); /* Reset The View */ gl.glLoadIdentity(); gl.glTranslatef(0.0f, 0.0f, 0.0f); gl.glRotatef(30.0f, 1.0f, 0.0f, 0.0f); } public void LoadGLTextures(GL10 gl) { IntBuffer textureBuffer = IntBuffer.allocate(2); gl.glGenTextures(2, textureBuffer); texture = textureBuffer.get(0); /* Typical Texture Generation Using Data From The Bitmap */ gl.glBindTexture(GL10.GL_TEXTURE_2D, texture); /* Linear Filtering */ gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR); gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR); /* Generate The Texture */ GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, GLImage.mBitmap, 0); texPearl = textureBuffer.get(1); gl.g