Search code examples
opengl-esshaderopengl-es-2.0

Returning values from a OpenGL ES 2.0 shader

Is it possible to get any values out of a OpenGL ES 2.0 shader? I'd like to use the gpu to do some processing (not 3D). The only thing I could think of is to render to the canvas and then to use readPixels to get the colors (preferably in a large 2d array).

Solution

  • Yes, that's called GPGPU. The only way is to draw to a framebuffer or a texture, here is a tutorial that explains it, just stick to the GLSL version.