Source code
Revision control
Copy as Markdown
Other Tools
<!--
Copyright (c) 2023 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>WebGL NV_shader_noperspective_interpolation Conformance Tests</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 width="128" height="128" id="c"></canvas>
<div id="description"></div>
<div id="console"></div>
<script>
"use strict";
description("This test verifies the functionality of the NV_shader_noperspective_interpolation extension, if it is available.");
debug("");
var wtu = WebGLTestUtils;
var gl = wtu.create3DContext("c", null, 2);
var ext;
function runShaderTests(extensionEnabled) {
debug("");
debug("Testing various shader compiles with extension " + (extensionEnabled ? "enabled" : "disabled"));
const macroVertex = `#version 300 es
in vec4 vPosition;
void main() {
#ifdef GL_NV_shader_noperspective_interpolation
gl_Position = vPosition;
#else
#error no GL_NV_shader_noperspective_interpolation;
#endif
}`;
const macroFragment = `#version 300 es
precision highp float;
out vec4 my_FragColor;
void main() {
#ifdef GL_NV_shader_noperspective_interpolation
my_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
#else
#error no GL_NV_shader_noperspective_interpolation;
#endif
}`;
for (const shaders of [[wtu.simpleVertexShaderESSL300, macroFragment],
[macroVertex, wtu.simpleColorFragmentShaderESSL300]]) {
// Expect the macro shader to succeed ONLY if enabled
if (wtu.setupProgram(gl, shaders)) {
if (extensionEnabled) {
testPassed("Macro defined in shaders when extension is enabled");
} else {
testFailed("Macro defined in shaders when extension is disabled");
}
} else {
if (extensionEnabled) {
testFailed("Macro not defined in shaders when extension is enabled");
} else {
testPassed("Macro not defined in shaders when extension is disabled");
}
}
}
const missingVertex = `#version 300 es
noperspective out float interpolant;
in vec4 vPosition;
void main() {
gl_Position = vPosition;
}`;
const missingFragment = `#version 300 es
precision highp float;
noperspective in float interpolant;
out vec4 my_FragColor;
void main() {
my_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
}`;
// Always expect the shader missing the #extension pragma to fail (whether enabled or not)
for (const shaders of [[missingVertex, wtu.simpleColorFragmentShaderESSL300],
[wtu.simpleVertexShaderESSL300, missingFragment],
[missingVertex, missingFragment]]) {
if (wtu.setupProgram(gl, shaders)) {
testFailed("Noperspective interpolation qualifier allowed without #extension pragma");
} else {
testPassed("Noperspective interpolation qualifier disallowed without #extension pragma");
}
}
const validVertex = `#version 300 es
#extension GL_NV_shader_noperspective_interpolation : enable
noperspective out float interpolant;
in vec4 vPosition;
void main() {
gl_Position = vPosition;
}`;
const validFragment = `#version 300 es
#extension GL_NV_shader_noperspective_interpolation : enable
precision highp float;
noperspective in float interpolant;
out vec4 my_FragColor;
void main() {
my_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
}`;
// Try to compile a shader using a noperspective qualifier that should only succeed if enabled
if (wtu.setupProgram(gl, [validVertex, validFragment])) {
if (extensionEnabled) {
testPassed("Noperspective interpolation qualifier compiled successfully when extension enabled");
} else {
testFailed("Noperspective interpolation qualifier compiled successfully when extension disabled");
}
} else {
if (extensionEnabled) {
testFailed("Noperspective interpolation qualifier failed to compile when extension enabled");
} else {
testPassed("Noperspective interpolation qualifier failed to compile when extension disabled");
}
}
debug("");
}
function runInterpolationTest() {
function draw(program, skew) {
gl.useProgram(program);
const posLoc = gl.getAttribLocation(program, "position");
const colLoc = gl.getAttribLocation(program, "color");
const buf = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, buf);
gl.bufferData(
gl.ARRAY_BUFFER,
new Float32Array([
-1.0, -1.0, 0.0, 1.0,
+1.0, -1.0, 0.0, 1.0,
0.0, +1.0 * skew, 0.0, skew,
1.0, 0.0, 0.0, 1.0,
0.0, 1.0, 0.0, 1.0,
0.0, 0.0, 1.0, 1.0]),
gl.STATIC_DRAW);
gl.vertexAttribPointer(posLoc, 4, gl.FLOAT, false, 0, 0);
gl.vertexAttribPointer(colLoc, 4, gl.FLOAT, false, 0, 48);
gl.enableVertexAttribArray(posLoc);
gl.enableVertexAttribArray(colLoc);
gl.drawArrays(gl.TRIANGLES, 0, 3);
}
const vertexSmooth = `#version 300 es
in vec4 position;
in vec4 color;
smooth out vec4 interp_color;
void main() {
gl_Position = position;
interp_color = color;
}`;
const fragmentSmooth = `#version 300 es
precision highp float;
smooth in vec4 interp_color;
out vec4 fragColor;
void main() {
fragColor = interp_color;
}`;
const programSmooth = wtu.setupProgram(gl, [vertexSmooth, fragmentSmooth]);
debug("Get non-skewed value with smooth interpolation");
gl.clearColor(0.0, 0.0, 0.0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT);
draw(programSmooth, 1.0);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors");
const smoothColor = new Uint8Array(4);
gl.readPixels(64, 64, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, smoothColor);
const vertexNoperspective = `#version 300 es
#extension GL_NV_shader_noperspective_interpolation : require
in vec4 position;
in vec4 color;
noperspective out vec4 interp_color;
void main() {
gl_Position = position;
interp_color = color;
}`;
const fragmentNoperspective = `#version 300 es
#extension GL_NV_shader_noperspective_interpolation : require
precision highp float;
noperspective in vec4 interp_color;
out vec4 fragColor;
void main() {
fragColor = interp_color;
}`;
const programNoperspective = wtu.setupProgram(gl, [vertexNoperspective, fragmentNoperspective]);
debug("");
debug("Check non-skewed value with noperspective interpolation");
gl.clear(gl.COLOR_BUFFER_BIT);
draw(programNoperspective, 1.0);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors");
wtu.checkCanvasRect(gl, 64, 64, 1, 1, smoothColor, "Non-skewed noperspective should match smooth");
debug("");
debug("Check skewed value with noperspective interpolation");
gl.clear(gl.COLOR_BUFFER_BIT);
draw(programNoperspective, 2.0);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors");
wtu.checkCanvasRect(gl, 64, 64, 1, 1, smoothColor, "Skewed noperspective should match smooth");
}
function runTest() {
if (!gl) {
testFailed("WebGL context does not exist");
return;
}
testPassed("WebGL context exists");
runShaderTests(false);
ext = gl.getExtension("NV_shader_noperspective_interpolation");
wtu.runExtensionSupportedTest(gl, "NV_shader_noperspective_interpolation", ext !== null);
if (!ext) {
testPassed("No NV_shader_noperspective_interpolation support -- this is legal");
} else {
testPassed("Successfully enabled NV_shader_noperspective_interpolation extension");
runShaderTests(true);
runInterpolationTest();
}
}
runTest();
var successfullyParsed = true;
</script>
<script src="../../js/js-test-post.js"></script>
</body>
</html>