| <!-- |
| Copyright (c) 2019 The Khronos Group Inc. |
| Use of this source code is governed by an MIT-style license that can be |
| found in the LICENSE.txt file. |
| --> |
| |
| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta charset="utf-8"> |
| <title>Test readBuffer Against WebGL 2</title> |
| <link rel="stylesheet" href="../../resources/js-test-style.css"/> |
| <script src="../../js/js-test-pre.js"></script> |
| <script src="../../js/webgl-test-utils.js"></script> |
| </head> |
| <body> |
| <div id="description"></div> |
| <div id="console"></div> |
| <canvas id="canvas" width="20" height="20"> </canvas> |
| <script> |
| "use strict"; |
| description("This tests reading from fbo"); |
| |
| var clearDrawingbuffer = function(color) { |
| gl.clearColor(color[0] / 255, color[1] / 255, color[2] / 255, color[3] / 255); |
| gl.clear(gl.COLOR_BUFFER_BIT); |
| } |
| |
| var validateReadingFromFramebuffer = function(color, expected, msg) { |
| var pixels = new Uint8Array(1 * 1 * 4); |
| gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, pixels); |
| wtu.glErrorShouldBe(gl, expected, msg); |
| if (expected == gl.NO_ERROR) |
| wtu.checkCanvasRect(gl, 0, 0, canvas.width, canvas.height, color, |
| "the color should be [" + color + "]"); |
| } |
| |
| 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 testReadBufferOnDefaultFB = function() { |
| gl.readBuffer(gl.NONE); |
| wtu.glErrorShouldBe(gl, gl.NO_ERROR, |
| "calling readBuffer with GL_NONE on the default framebuffer should succeed."); |
| var pixels = new Uint8Array(1 * 1 * 4); |
| gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, pixels); |
| wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, |
| "should generate INVALID_OPERATION when reading from framebuffer and read buffer is GL_NONE."); |
| gl.readBuffer(gl.BACK); |
| wtu.glErrorShouldBe(gl, gl.NO_ERROR, |
| "calling readBuffer with GL_BACK on the default framebuffer should succeed."); |
| |
| gl.readBuffer(gl.COLOR_ATTACHMENT0); |
| wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, |
| "calling readBuffer with GL_COLOR_ATTACHMENT0 on the default framebuffer should generate INVALID_OPERATION."); |
| } |
| |
| var testReadBufferOnFBO = function() { |
| gl.readBuffer(gl.BACK); |
| wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, |
| "calling readBuffer with GL_BACK on fbo should generate INVALID_OPERATION."); |
| |
| gl.readBuffer(gl.NONE); |
| wtu.glErrorShouldBe(gl, gl.NO_ERROR, |
| "calling readBuffer with GL_NONE on fbo should succeed."); |
| var pixels = new Uint8Array(1 * 1 * 4); |
| gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, pixels); |
| wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, |
| "should generate INVALID_OPERATION when reading from framebuffer and read buffer is GL_NONE."); |
| gl.readBuffer(gl.COLOR_ATTACHMENT0); |
| wtu.glErrorShouldBe(gl, gl.NO_ERROR, |
| "calling readBuffer with GL_COLOR_ATTACHMENT0 on fbo should succeed."); |
| |
| var maxColorAttachments = gl.getParameter(gl.MAX_COLOR_ATTACHMENTS); |
| gl.readBuffer(gl.COLOR_ATTACHMENT0 + maxColorAttachments); |
| wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, |
| "calling readBuffer with GL_COLOR_ATTACHMENTi that exceeds MAX_COLOR_ATTACHMENT on fbo should generate INVALID_OPERATION."); |
| gl.readBuffer(gl.COLOR_ATTACHMENT1); |
| wtu.glErrorShouldBe(gl, gl.NO_ERROR, |
| "calling readBuffer with GL_COLOR_ATTACHMENT1 on the fbo should succeed."); |
| shouldBe('gl.getParameter(gl.READ_BUFFER)', 'gl.COLOR_ATTACHMENT1'); |
| } |
| |
| debug(""); |
| debug("Canvas.getContext"); |
| |
| 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"); |
| |
| debug(""); |
| debug("Checking reading from framebuffer."); |
| |
| // Test on the default framebuffer. Read buffer is GL_BACK by default. |
| var backColor = [0, 0, 0, 255]; |
| clearDrawingbuffer(backColor); |
| validateReadingFromFramebuffer(backColor, gl.NO_ERROR, |
| "should be no errors when reading from GL_BACK on the default framebuffer."); |
| |
| shouldBe('gl.getParameter(gl.READ_BUFFER)', 'gl.BACK'); |
| testReadBufferOnDefaultFB(); |
| |
| // Test on fbo. Read buffer is GL_COLOR_ATTACHMENT0 by default |
| var fb = gl.createFramebuffer(); |
| gl.bindFramebuffer(gl.FRAMEBUFFER, fb); |
| var colorbuffer = setupRenderbuffer(gl.COLOR_ATTACHMENT0); |
| var red = [255, 0, 0, 255]; |
| clearDrawingbuffer(red); |
| validateReadingFromFramebuffer(red, gl.NO_ERROR, |
| "should be no errors when reading from GL_COLOR_ATTACHMENT0 on fbo."); |
| |
| shouldBe('gl.getParameter(gl.READ_BUFFER)', 'gl.COLOR_ATTACHMENT0'); |
| testReadBufferOnFBO(); |
| |
| // Test on user defined read buffer (GL_COLOR_ATTACHMENT1) with or without corresponding image on fbo. |
| gl.bindFramebuffer(gl.FRAMEBUFFER, fb); |
| var colorbuffer1 = setupRenderbuffer(gl.COLOR_ATTACHMENT1); |
| var green = [0, 255, 0, 255]; |
| gl.drawBuffers([gl.NONE, gl.COLOR_ATTACHMENT1]); |
| clearDrawingbuffer(green); |
| wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no error after setup and clear render buffer"); |
| gl.readBuffer(gl.COLOR_ATTACHMENT1); |
| validateReadingFromFramebuffer(green, gl.NO_ERROR, |
| "should be no errors when reading from GL_COLOR_ATTACHMENT1 on fbo."); |
| shouldBe('gl.getParameter(gl.READ_BUFFER)', 'gl.COLOR_ATTACHMENT1'); |
| // Need to reset draw buffers, otherwise it triggers a mac driver bug. |
| // We add a separate test for that bug: conformance2/rendering/framebuffer-completeness-unaffected.html |
| gl.drawBuffers([gl.COLOR_ATTACHMENT0]); |
| |
| gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT1, gl.RENDERBUFFER, null) |
| gl.readBuffer(gl.COLOR_ATTACHMENT1); |
| validateReadingFromFramebuffer(null, gl.INVALID_OPERATION, |
| "should generate INVALID_OPERATION when reading from GL_COLOR_ATTACHMENT1 but this attachment has no image currently."); |
| |
| // switch to another fbo, read buffer is GL_COLOR_ATTACHMENT0, not GL_COLOR_ATTACHMENT1 |
| var fb1 = gl.createFramebuffer(); |
| gl.bindFramebuffer(gl.FRAMEBUFFER, fb1); |
| var buffer = setupRenderbuffer(gl.COLOR_ATTACHMENT0); |
| shouldBe('gl.getParameter(gl.READ_BUFFER)', 'gl.COLOR_ATTACHMENT0'); |
| var blue = [0, 0, 255, 255]; |
| clearDrawingbuffer(blue); |
| validateReadingFromFramebuffer(blue, gl.NO_ERROR, |
| "should be no errors when reading from GL_COLOR_ATTACHMENT0 on another fbo."); |
| |
| // switch from fbo to default fb, read buffer will switch to GL_BACK from GL_COLOR_ATTACHMENT0 |
| gl.bindFramebuffer(gl.FRAMEBUFFER, null); |
| shouldBe('gl.getParameter(gl.READ_BUFFER)', 'gl.BACK'); |
| validateReadingFromFramebuffer(backColor, gl.NO_ERROR, |
| "should be no errors when reading from GL_BACK on the default framebuffer."); |
| |
| gl.deleteFramebuffer(fb); |
| gl.deleteRenderbuffer(colorbuffer); |
| gl.deleteRenderbuffer(colorbuffer1); |
| gl.deleteFramebuffer(fb1); |
| gl.deleteRenderbuffer(buffer); |
| } |
| |
| debug(""); |
| var successfullyParsed = true; |
| |
| </script> |
| <script src="../../js/js-test-post.js"></script> |
| |
| </body> |
| </html> |