31.我如何转换一个物体使它指向或者跟随场景中的一个物体,或点? 你需要构造一个矩阵 , 它可以转换你的物体的本地坐标系统到一个你所希望面对的方向的坐标系统. 看 example code , 是如何建造这类矩阵的. 假如你仅仅指是想渲染一个物体, 使它可以面对观察者, 你可以考虑通过在眼坐标空间中把模型视点矩阵设置...
{ // Grab the screen pixels and copy into local memory // 从FrameBuffer中获取屏幕像素,并拷贝到客户端内存中 glReadPixels(0, 0, screenWidth, screenHeight, GL_RGB, GL_UNSIGNED_BYTE, pixelData); // Push pixels from client memory into texture // Setup texture unit for new blur, this gets...
glReadPixels() The following examples show how to use org.lwjgl.opengl.GL11#glReadPixels() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the ...
7.参考 https://stackoverflow.com/questions/3073796/how-to-use-glcopyimage2d https://github.com/Jba03/glReadPixels_example
这些函数跟glReadPixels很相似,不相似的地方就是,它不是从framebuffer里读取数据,它直接从一个纹理对象里读取出具的。glGetTexImage函数直接从当下被绑定在某个绑定节点上的纹理对象里读取数据,glGetTextureImage 这个函数则是从texture参数指定的纹理对象里面读取数据。注意,glGetTextureImage函数有额外的参数叫bufSize,这个...
GLES20.glReadPixels(0, 0, 512, 512, GL10.GL_RGBA, GL10.GL_UNSIGNED_BYTE, i); final Bitmap bitmap = frameToBitmap(512,512,i); new Handler(Looper.getMainLooper()).post(new Runnable() { @Override public void run() { mImageView.setImageBitmap(bitmap); } }); } }); surfaceView....
For example, glReadPixels() and glGetTexImage() are"pack"pixel operations, and glDrawPixels(), glTexImage2D() and glTexSubImage2D() are"unpack"operations. When a PBO is bound with GL_PIXEL_PACK_BUFFER_ARB token, glReadPixels() reads pixel data from a OpenGL framebuffer and write (pack) ...
you can read a rectangular area of pixel data from frame buffer usingglReadPixels(), and get fully transformed vertex data usingglRenderMode(GL_FEEDBACK).glCopyPixels()does not return pixel data to the specified system memory, but copy them back to the another frame buffer, for example, from...
For example, glReadPixels() and glGetTexImage() are"pack"pixel operations, and glDrawPixels(), glTexImage2D() and glTexSubImage2D() are"unpack"operations. When a PBO is bound with GL_PIXEL_PACK_BUFFER token, glReadPixels() reads pixel data from a OpenGL framebuffer and write (pack) the ...
;voidSetupBlurProg(void);// returns 1 - 6 for blur texture units// curPixBuf is always between 0 and 5voidAdvanceBlurTaget(){curBlurTarget=((curBlurTarget+1)%6);}GLuintGetBlurTarget0(){return(1+((curBlurTarget+5)%6));}GLuintGetBlurTarget1(){return(1+((curBlurTarget+4)%6));...