public void onDrawFrame(GL10 gl10, boolean fpsTimeElapsed) {
GL11 gl = (GL11) gl10;
updateWithDelta(1.0f / MAXIMUM_UPDATE_RATE);
synchronized (transforms) {
if (fpsTimeElapsed) {
onTransform();
}
}
sourcePosition.x = x;
sourcePosition.y = y;
gl.glMatrixMode(GL11.GL_MODELVIEW);
gl.glLoadIdentity();
gl.glEnableClientState(GL11.GL_COLOR_ARRAY);
// unbind all buffers
gl.glBindBuffer(GL11.GL_ELEMENT_ARRAY_BUFFER, 0);
gl.glBindBuffer(GL11.GL_ARRAY_BUFFER, 0);
gl.glBindTexture(GL11.GL_TEXTURE_2D, 0);
gl.glBindBuffer(GL11.GL_ARRAY_BUFFER, verticesID[0]);
// Using glBufferSubData means that a copy is done from the quads array to the buffer rather
// than recreating the buffer which
// would be an allocation and copy. The copy also only takes over the number of live particles.
// This provides a nice performance
// boost.
quadsBuffer.put(quads);
quadsBuffer.position(0);
gl.glBufferSubData(GL11.GL_ARRAY_BUFFER, 0, 128 * particleIndex, quadsBuffer);
// Configure the vertex pointer which will use the currently bound VBO for its data
gl.glVertexPointer(2, GL11.GL_FLOAT, 32, 0);
gl.glColorPointer(4, GL11.GL_FLOAT, 32, (4 * 4));
gl.glTexCoordPointer(2, GL11.GL_FLOAT, 32, (4 * 2));
if (hasTexture) {
gl.glEnable(GL11.GL_TEXTURE_2D);
gl.glBindTexture(GL11.GL_TEXTURE_2D, getTexture().getTextureId());
}
gl.glBlendFunc(srcBlendFactor, dstBlendFactor);
gl.glDrawElements(GL11.GL_TRIANGLES, particleIndex * 6, GL11.GL_UNSIGNED_SHORT, indicesBuffer);
gl.glBindBuffer(GL11.GL_ARRAY_BUFFER, 0);
gl.glBlendFunc(GL11.GL_ONE, GL11.GL_ONE_MINUS_SRC_ALPHA);
gl.glDisableClientState(GL11.GL_COLOR_ARRAY);
}
@Override
public void glBufferSubData(int target, int offset, int size, Buffer data) {
gl.glBufferSubData(target, offset, size, data);
}