CodeSnippits Dynamic Textures
From PyWiki
Dynamic Textures
Heres a ( rather inefficient ) demo of how to manually create a texture and modify it during runtime. Some code borrowed from the forum. Would be faster by setting up arrays in advance instead of creating them every frame, and by using Numeric Python to handle them.
import sys sys.path.insert(0,'..') import ogre.renderer.OGRE as ogre import ctypes import SampleFramework as sf class textureListener(ogre.FrameListener): def __init__(self, app): ogre.FrameListener.__init__(self) self.app = app self.grnVal = 0 self.fading = True def frameStarted(self, frameEvent): self.grnVal = self.fading and self.grnVal + 1 or self.grnVal -1 if self.grnVal == 255: self.fading = False elif self.grnVal == 0: self.fading = True colArray = [0,self.grnVal,0,128] * 16 * 16 self.app.setTextureManual(self.app.mTex, 16,16, colArray) return True class textureTest(sf.Application): def __init__(self): sf.Application.__init__(self) def _createScene(self): self.mTex = ogre.TextureManager.getSingleton().createManual( "DynamicTexture", ogre.ResourceGroupManager.DEFAULT_RESOURCE_GROUP_NAME, ogre.TEX_TYPE_2D, 16, 16, 0, ogre.PF_BYTE_BGRA, ogre.TU_DEFAULT) colArray = [0,255,0,128] * 16 * 16 self.setTextureManual(self.mTex, 16, 16, colArray) self.material = ogre.MaterialManager.getSingleton().create( "DynamicTextureMaterial", ogre.ResourceGroupManager.DEFAULT_RESOURCE_GROUP_NAME) self.material.getTechnique(0).getPass(0).createTextureUnitState("DynamicTexture") self.material.getTechnique(0).getPass(0).setSceneBlending(ogre.SBT_TRANSPARENT_ALPHA) self.ent = self.sceneManager.createEntity("mrben", "knot.mesh") self.ent.setMaterialName("DynamicTextureMaterial") self.node = self.sceneManager.getRootSceneNode().createChildSceneNode('Knot3Node', (-100, -10, -200)) self.node.attachObject(self.ent) self.lstnr = textureListener(self) ogre.Root.getSingleton().addFrameListener(self.lstnr) #Texture is a manually created Texture #dataArray is an array of pixel colour data def setTextureManual(self, texture, width, height, dataArray): import ctypes # Get the pixel buffer pixelBuffer = texture.getBuffer() # Lock the pixel buffer and get a pixel box pointer = pixelBuffer.lock(0,width*height*4,ogre.HardwareBuffer.HBL_NORMAL) #number 4 here is use to accommodate the bytes for r, g, b, a may vary with different pixel formats storageclass = ctypes.c_uint8 * (width*height*4) cbuffer=storageclass.from_address(ogre.CastInt(pointer)) pos=0 for j in range(height): for i in range( width ) : cbuffer[pos]= dataArray[pos] # B pos+=1 cbuffer[pos]= dataArray[pos] # G pos+=1 cbuffer[pos]= dataArray[pos] # R pos+=1 cbuffer[pos]= dataArray[pos] # A pos+=1 # Unlock the pixel buffer pixelBuffer.unlock() if __name__=='__main__': ta = textureTest() ta.go()
