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<!--
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.
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>WebGL BlitFramebuffer 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 id="example" width="8" height="8"></canvas>
<div id="description"></div>
<div id="console"></div>
<script>
"use strict";
var wtu = WebGLTestUtils;
description("This test verifies the functionality of blitFramebuffer when scissor test is enabled.");
var gl = wtu.create3DContext("example", undefined, 2);
// Define the src region and dst region for blitFramebuffer
var blit_src = [0, 0, 4, 4];
var blit_dst = [2, 2, 6, 6];
if (!gl) {
testFailed("WebGL context does not exist");
} else {
testPassed("WebGL context exists");
var bounds = [
[0, 0, 4, 4], // Partially intersects with blitFramebuffer's dst region
[0, 0, 2, 2], // No intersection with blitFramebuffer's dst region
];
// We can compute the real drawing area by intersecting the scissor bound with dst region of blitting.
var intersections = [
[2, 2, 4, 4],
[0, 0, 0, 0],
];
for (var ii = 0; ii < bounds.length; ++ii) {
blitframebuffer_scissor(gl.RGBA8, gl.RGBA8, bounds[ii], intersections[ii]);
blitframebuffer_scissor(gl.RGBA8, gl.SRGB8_ALPHA8, bounds[ii], intersections[ii]);
blitframebuffer_scissor(gl.SRGB8_ALPHA8, gl.RGBA8, bounds[ii], intersections[ii]);
blitframebuffer_scissor(gl.SRGB8_ALPHA8, gl.SRGB8_ALPHA8, bounds[ii], intersections[ii]);
}
}
function checkPixel(color, expectedColor) {
var tolerance = 3;
return (Math.abs(color[0] - expectedColor[0]) <= tolerance &&
Math.abs(color[1] - expectedColor[1]) <= tolerance &&
Math.abs(color[2] - expectedColor[2]) <= tolerance &&
Math.abs(color[3] - expectedColor[3]) <= tolerance);
}
function blitframebuffer_scissor(readbufferFormat, drawbufferFormat, bound, intersection) {
debug("");
debug("read buffer format is: " + wtu.glEnumToString(gl, readbufferFormat) + ", draw buffer format is: " + wtu.glEnumToString(gl, drawbufferFormat));
// Initiate data to read framebuffer
var size = 8;
var data = new Uint8Array(size * size * 4);
var color = [250, 100, 15, 255];
for (var ii = 0; ii < size * size * 4; ii += 4) {
for (var jj = 0; jj < 4; ++jj) {
data[ii + jj] = color[jj];
}
}
// Feed data to read buffer. Feed 0 to draw buffer.
var tex_read = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, tex_read);
gl.texImage2D(gl.TEXTURE_2D, 0, readbufferFormat, size, size, 0, gl.RGBA, gl.UNSIGNED_BYTE, data);
var fbo_read = gl.createFramebuffer();
gl.bindFramebuffer(gl.READ_FRAMEBUFFER, fbo_read);
gl.framebufferTexture2D(gl.READ_FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex_read, 0);
var tex_draw = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, tex_draw);
gl.texImage2D(gl.TEXTURE_2D, 0, drawbufferFormat, size, size, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
var fbo_draw = gl.createFramebuffer();
gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, fbo_draw);
gl.framebufferTexture2D(gl.DRAW_FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex_draw, 0);
if (gl.checkFramebufferStatus(gl.READ_FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE || gl.checkFramebufferStatus(gl.DRAW_FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE) {
testFailed("Framebuffer incomplete.");
return;
}
// Enable scissor test. Then blit framebuffer.
gl.enable(gl.SCISSOR_TEST);
gl.scissor(bound[0], bound[1], bound[2], bound[3]);
gl.blitFramebuffer(blit_src[0], blit_src[1], blit_src[2], blit_src[3], blit_dst[0], blit_dst[1], blit_dst[2], blit_dst[3], gl.COLOR_BUFFER_BIT, gl.LINEAR);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "blitframebuffer should succeed");
// Read pixels and Comparison
var pixels = new Uint8Array(size * size * 4);
gl.bindFramebuffer(gl.READ_FRAMEBUFFER, fbo_draw);
gl.readPixels(0, 0, size, size, gl.RGBA, gl.UNSIGNED_BYTE, pixels);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "readPixels should succeed");
var blitColor;
var expectedColor;
var clearColor = [0, 0, 0, 0];
if (readbufferFormat == drawbufferFormat) {
blitColor = color;
} else if (readbufferFormat == gl.SRGB8_ALPHA8) {
blitColor = wtu.sRGBToLinear(color);
} else {
blitColor = wtu.linearToSRGB(color);
}
var failed = false;
for (var ii = 0; ii < size; ++ii) {
for (var jj = 0; jj < size; ++jj) {
if (ii >= intersection[0] && jj >= intersection[1] && ii < intersection[2] && jj < intersection[3]) {
expectedColor = blitColor;
} else {
expectedColor = clearColor;
}
var index = (ii * size + jj) * 4;
var pixelColor = [pixels[index], pixels[index + 1], pixels[index + 2], pixels[index + 3]];
if (checkPixel(pixelColor, expectedColor) == false) {
failed = true;
debug("Pixels comparison failed. Pixel at [" + jj + ", " + ii + "] should be (" + expectedColor + "), but the actual color is (" + pixelColor + ")");
}
}
}
if (failed == false) {
testPassed("All pixels comparision passed!");
}
// Deinit
gl.bindTexture(gl.TEXTURE_2D, null);
gl.bindFramebuffer(gl.READ_FRAMEBUFFER, null);
gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, null);
gl.deleteFramebuffer(fbo_read);
gl.deleteFramebuffer(fbo_draw);
gl.deleteTexture(tex_read);
gl.deleteTexture(tex_draw);
};
var successfullyParsed = true;
</script>
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