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<!--
/*
** Copyright (c) 2016 The Khronos Group Inc.
**
** Permission is hereby granted, free of charge, to any person obtaining a
** copy of this software and/or associated documentation files (the
** "Materials"), to deal in the Materials without restriction, including
** without limitation the rights to use, copy, modify, merge, publish,
** distribute, sublicense, and/or sell copies of the Materials, and to
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**
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** in all copies or substantial portions of the Materials.
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** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
*/
-->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>WebGL Integer Cubemap Texture Specification Order Bug Test</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>
<canvas id="example" width="128" height="128"></canvas>
<div id="description"></div>
<div id="console"></div>
<script id="vs" type="x-shader/x-vertex">#version 300 es
precision highp float;
in vec4 a_position;
void main(){
gl_Position = a_position;
}
</script>
<script id="fs" type="x-shader/x-fragment">#version 300 es
precision highp float;
// This program samples both textures at varying Lod and exposes
// both of them, the regular on top, and the weird on the bottom.
// On the NVIDIA driver the top is both green and red while the bottom
// is only green. This is a driver bug because both textures should be
// exactly the same.
// I think that because of our level specification order weirdness, the
// driver gets confused as to which levels are complete and thinks only
// level 0 is complete. Then when sampling the texture it clamps the sampling
// to only level 0, resulting in green for all Lod values.
layout(location = 0) out vec4 fragColor;
uniform highp isamplerCube texRegular;
uniform highp isamplerCube texWeird;
void main() {
vec2 fragPos = gl_FragCoord.xy / vec2(128.0, 128.0);
float lod = (fragPos.x - 0.5) * 10.0 + 0.5;
ivec4 colorRegular = textureLod(texRegular, vec3(1.0, 0.0, 0.0), lod);
ivec4 colorWeird = textureLod(texWeird, vec3(1.0, 0.0, 0.0), lod);
if (fragPos.y > 0.51) {
fragColor = vec4(vec2(colorRegular.rg), 0.0, 1.0);
} else if (fragPos.y < 0.49){
fragColor = vec4(vec2(colorWeird.rg), 0.0, 1.0);
} else {
fragColor = vec4(0.0, 0.0, 0.0, 1.0);
}
}
</script>
<script>
"use strict";
var wtu = WebGLTestUtils;
description("Test for a driver bug when specifying integer cubemaps in weird order");
var gl = wtu.create3DContext("example", undefined, 2);
function createTextureCube(layers, maxLevel) {
var texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_CUBE_MAP, texture);
layers.forEach(function(layer) {
var level = layer.level;
var face = layer.face;
var color = layer.color;
var levelSize = 1 << (maxLevel - level);
var backingBuffer = new ArrayBuffer(levelSize * levelSize * 2);
new Int16Array(backingBuffer).fill(color);
gl.texImage2D(face + gl.TEXTURE_CUBE_MAP_POSITIVE_X, level, gl.RG8I, levelSize, levelSize, 0, gl.RG_INTEGER, gl.BYTE, new Int8Array(backingBuffer));
});
gl.texParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MIN_FILTER, gl.NEAREST_MIPMAP_LINEAR);
gl.texParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
return texture;
}
function test() {
var kMaxLevel = 4;
var kBlack = 0x0000;
var kGreen = 0x7F00;
var kRed = 0x007F;
// Create two integer cubemaps with green on level 0 and red on the others.
// The "regular" cube map is filled in a sensible manner.
var regularLayers = [];
for (var level = 0; level <= kMaxLevel; level ++) {
for (var face = 0; face < 6; face ++) {
if (level == 0) {
regularLayers.push({level: level, face: face, color: kGreen});
} else {
regularLayers.push({level: level, face: face, color: kRed});
}
}
}
// The "weird" cube map has all its >= 1 levels filled, then the first level,
// then the >= 1 levels again but for one face. This replicates what the
// Chromium command buffer "cubemap completeness" workaround is doing.
var weirdLayers = [];
for (var level = 1; level <= kMaxLevel; level ++) {
for (var face = 0; face < 5; face ++) {
weirdLayers.push({level: level, face: face, color: kBlack});
}
weirdLayers.push({level: level, face: 5, color: kRed});
}
for (var level = 0; level <= kMaxLevel; level ++) {
for (var face = 0; face < 6; face ++) {
if (level == 0) {
weirdLayers.push({level: level, face: face, color: kGreen});
} else {
if (face != 5) {
weirdLayers.push({level: level, face: face, color: kRed});
}
}
}
}
var regularTex = createTextureCube(regularLayers, kMaxLevel);
var weirdTex = createTextureCube(weirdLayers, kMaxLevel);
// At this point both textures should be the same.
var sampleProgram = wtu.setupProgram(gl, ["vs", "fs"], ["a_position"]);
var regularLocation = gl.getUniformLocation(sampleProgram, "texRegular");
var weirdLocation = gl.getUniformLocation(sampleProgram, "texWeird");
wtu.setupQuad(gl, gl.getAttribLocation(sampleProgram, "a_position"));
gl.clearColor(0.0, 0.0, 0.0, 0.0);
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_CUBE_MAP, regularTex);
gl.activeTexture(gl.TEXTURE0 + 1);
gl.bindTexture(gl.TEXTURE_CUBE_MAP, weirdTex);
gl.uniform1i(regularLocation, 0);
gl.uniform1i(weirdLocation, 1);
wtu.drawUnitQuad(gl);
wtu.checkCanvasRect(gl, 96, 32, 1, 1, [255, 0, 0, 255], "should be green");
wtu.checkCanvasRect(gl, 96, 96, 1, 1, [255, 0, 0, 255], "should be green");
wtu.checkCanvasRect(gl, 32, 32, 1, 1, [0, 255, 0, 255], "should be red");
wtu.checkCanvasRect(gl, 32, 96, 1, 1, [0, 255, 0, 255], "should be red");
}
test();
debug("");
var successfullyParsed = true;
</script>
<script src="../../../js/js-test-post.js"></script>
</body>
</html>
|
