public texReader(WebGLRenderingContext webgl, WebGLTexture texRGBA, int width, int height, bool gray = true)
{
this.gray = gray;
this.width = width;
this.height = height;
var fbo = webgl.CreateFramebuffer();
WebGLFramebuffer fbold = webgl.GetParameter(webgl.FRAMEBUFFER_BINDING) as WebGLFramebuffer;
webgl.BindFramebuffer(webgl.FRAMEBUFFER, fbo);
webgl.FramebufferTexture2D(webgl.FRAMEBUFFER, webgl.COLOR_ATTACHMENT0, webgl.TEXTURE_2D,
texRGBA, 0);
var readData = new Uint8Array(this.width * this.height * 4);
readData[0] = 2;
webgl.ReadPixels(0, 0, this.width, this.height, webgl.RGBA, webgl.UNSIGNED_BYTE,
readData);
webgl.DeleteFramebuffer(fbo);
webgl.BindFramebuffer(webgl.FRAMEBUFFER, fbold);
if (gray)
{
this.data = new Uint8Array(this.width * this.height);
for (var i = 0; i < width * height; i++)
{
this.data[i] = readData[i * 4];
}
}
else
{
this.data = readData;
}
}