framebuffer-completeness-unaffected.html

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<title>Test drawBuffers, readBuffer, and fbo completeness</title>

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// In MacOSX, if drawBuffers() and readBuffer() both select an attachment with no image attached,

// fbo becomes incomplete. However, drawBuffers() and readBuffer() should not affect fbo completeness.

"use strict";

description("This tests drawBuffers, readBuffer, and fbo completeness");

var setupRenderbuffer = function(attachment) {

  var renderbuffer = gl.createRenderbuffer();

  gl.bindRenderbuffer(gl.RENDERBUFFER, renderbuffer);

  gl.framebufferRenderbuffer(gl.FRAMEBUFFER, attachment, gl.RENDERBUFFER, renderbuffer);

  gl.renderbufferStorage(gl.RENDERBUFFER, gl.RGBA8, canvas.width, canvas.height);

  return renderbuffer;

var wtu = WebGLTestUtils;

var canvas = document.getElementById("canvas");

var gl = wtu.create3DContext(canvas, undefined, 2);

if (!gl) {

  testFailed("context does not exist");

} else {

  testPassed("context exists");

  var fb = gl.createFramebuffer();

  gl.bindFramebuffer(gl.FRAMEBUFFER, fb);

  debug("fbo with two color images attached should be complete");

  var colorbuffer = setupRenderbuffer(gl.COLOR_ATTACHMENT0);

  var colorbuffer1 = setupRenderbuffer(gl.COLOR_ATTACHMENT1);

  shouldBe('gl.checkFramebufferStatus(gl.FRAMEBUFFER)', 'gl.FRAMEBUFFER_COMPLETE');

  debug("drawBuffers selects ATTACHMENT1, fbo should be complete");

  gl.drawBuffers([gl.NONE, gl.COLOR_ATTACHMENT1]);

  shouldBe('gl.checkFramebufferStatus(gl.FRAMEBUFFER)', 'gl.FRAMEBUFFER_COMPLETE');

  debug("remove image attached to ATTACHMENT1, fbo should be complete");

  gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT1, gl.RENDERBUFFER, null);

  shouldBe('gl.checkFramebufferStatus(gl.FRAMEBUFFER)', 'gl.FRAMEBUFFER_COMPLETE');

  debug("set read buffer to ATTACHMENT1, fbo should be complete");

  gl.readBuffer(gl.COLOR_ATTACHMENT1);

  shouldBe('gl.checkFramebufferStatus(gl.FRAMEBUFFER)', 'gl.FRAMEBUFFER_COMPLETE');

  debug("drawBuffers selects ATTACHMENT0, fbo should be complete");

  gl.drawBuffers([gl.COLOR_ATTACHMENT0]);

  shouldBe('gl.checkFramebufferStatus(gl.FRAMEBUFFER)', 'gl.FRAMEBUFFER_COMPLETE');

  debug("drawBuffers selects ATTACHMENT1, fbo should be complete");

  gl.drawBuffers([gl.NONE, gl.COLOR_ATTACHMENT1]);

  shouldBe('gl.checkFramebufferStatus(gl.FRAMEBUFFER)', 'gl.FRAMEBUFFER_COMPLETE');

  debug("set read buffer to ATTACHMENT0, fbo should be complete");

  gl.readBuffer(gl.COLOR_ATTACHMENT0);

  shouldBe('gl.checkFramebufferStatus(gl.FRAMEBUFFER)', 'gl.FRAMEBUFFER_COMPLETE');

  gl.deleteFramebuffer(fb);

  gl.deleteRenderbuffer(colorbuffer);

  gl.deleteRenderbuffer(colorbuffer1);

  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no error after setup and clear render buffer");

debug("");

var successfullyParsed = true;

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