WebGL texImage2D vs texSubImage2D

JavaScript performance comparison

Revision 21 of this test case created

Preparation code

<script>
  var size = 1024;
  var buffer = new Uint8Array(size*size*4);

  var canvas = document.createElement('canvas');
  canvas.width = size;
  canvas.height = size;
 
  var gl = canvas.getContext('experimental-webgl');
  var tex = gl.createTexture();
  gl.bindTexture(gl.TEXTURE_2D, tex);

  gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA,
                size, size, 0,
                gl.RGBA, gl.UNSIGNED_BYTE,
                buffer);
var numQuads = 16;
var sqrtQuads = Math.sqrt(numQuads);
isqrtQuads = 1/sqrtQuads;
</script>

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Testing in unknown unknown
Test Ops/sec
texImage2D full texture
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA,
              size, size, 0,
              gl.RGBA, gl.UNSIGNED_BYTE,
              buffer);
pending…
texSubImage2D full texture
gl.texSubImage2D(gl.TEXTURE_2D, 0,
                 0, 0, size, size,
                 gl.RGBA, gl.UNSIGNED_BYTE,
                 buffer);
pending…
texSubImage2D partial texture
gl.texSubImage2D(gl.TEXTURE_2D, 0,
                 1, 1, size-1, size-1,
                 gl.RGBA, gl.UNSIGNED_BYTE,
                 buffer);
pending…
texSubImage2D 4*4 quadrants
for(var i = 0; i < sqrtQuads; ++i){
  for(var j = 0; j < sqrtQuads; ++j){
   gl.texSubImage2D(gl.TEXTURE_2D, 0,
                 i * sqrtQuads, j * sqrtQuads, size * isqrtQuads, size * isqrtQuads,
                 gl.RGBA, gl.UNSIGNED_BYTE,
                 buffer);
  }
}
pending…

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