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Diffstat (limited to 'dom/canvas/test/webgl-conf/checkout/conformance/rendering/canvas-alpha-bug.html')
-rw-r--r-- | dom/canvas/test/webgl-conf/checkout/conformance/rendering/canvas-alpha-bug.html | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/rendering/canvas-alpha-bug.html b/dom/canvas/test/webgl-conf/checkout/conformance/rendering/canvas-alpha-bug.html new file mode 100644 index 0000000000..f6225ffae2 --- /dev/null +++ b/dom/canvas/test/webgl-conf/checkout/conformance/rendering/canvas-alpha-bug.html @@ -0,0 +1,116 @@ +<!-- +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>Alpha blending bug on WebGL canvas</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="128" height="128"> </canvas> + +<script id="vshader" type="x-shader/x-vertex"> +attribute vec2 a_position; +varying vec2 v_uv; +void main() +{ + v_uv = a_position.xy * vec2(0.5, 0.5) + vec2(0.5, 0.5); + gl_Position = vec4(a_position.xy, 0.0, 1.0); +} +</script> + +<script id="fshader" type="x-shader/x-fragment"> +precision mediump float; +varying vec2 v_uv; +uniform sampler2D u_texture; +uniform vec4 u_color; +void main() +{ + vec4 tex = texture2D(u_texture, v_uv); + gl_FragColor = tex * u_color; +} +</script> + +<script> +"use strict"; +// This test exposes an Intel driver issue on macOS. +var wtu = WebGLTestUtils; +var gl = wtu.create3DContext("canvas"); + +var program; +var offscreen_tex; +var fbo; + +function init() +{ + // Init program + program = wtu.setupProgram(gl, ["vshader", "fshader"], ["a_position"]); + + // Init offscreen render targets and specify the format of offscreen texture to be RGB. + offscreen_tex = gl.createTexture(); + gl.activeTexture(gl.TEXTURE0); + gl.bindTexture(gl.TEXTURE_2D, offscreen_tex); + gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST); + gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST); + gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGB, canvas.width, canvas.height, 0, gl.RGB, gl.UNSIGNED_BYTE, null); + + fbo = gl.createFramebuffer(); + gl.bindFramebuffer(gl.FRAMEBUFFER, fbo); + gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, offscreen_tex, 0); + + // Init blend state + gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA); +} + +function draw_rect() +{ + gl.useProgram(program); + + gl.bindTexture(gl.TEXTURE_2D, offscreen_tex); + var u_tex_loc = gl.getUniformLocation(program, 'u_texture'); + gl.uniform1i(u_tex_loc, 0); + + wtu.setupUnitQuad(gl); + wtu.drawFloatColorQuad(gl, [1.0, 1.0, 1.0, 1.0]); +} + +function test_canvas_alpha() { + init(); + + // Clear offscreen texture to Green + gl.bindFramebuffer(gl.FRAMEBUFFER, fbo); + gl.viewport(0, 0, canvas.width, canvas.height); + gl.clearColor(0.0, 1.0, 0.0, 1.0); + gl.clear(gl.COLOR_BUFFER_BIT); + + // Clear default framebuffer + gl.bindFramebuffer(gl.FRAMEBUFFER, null); + gl.viewport(0, 0, canvas.width, canvas.height); + gl.clearColor(1.0, 0.0, 0.0, 1.0); + gl.clear(gl.COLOR_BUFFER_BIT); + + // Enable alpha blending and render to default framebuffer + gl.enable(gl.BLEND); + draw_rect(); + wtu.checkCanvasRect(gl, 0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight, [0, 255, 0, 255]); +} + +test_canvas_alpha(); + +description("Exposes alpha blending bug in Intel drivers on macOS - see https://crbug.com/886970"); +var successfullyParsed = true; + +</script> +<script src="../../js/js-test-post.js"></script> + +</body> +</html> |