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<!DOCTYPE html>
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<head>
<meta charset="utf-8">
<title>WebGL BlitFramebuffer Tests</title>
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<canvas id="canvas" 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 with multiple draw buffers (srgb image and linear image).");
var gl = wtu.create3DContext("canvas", undefined, 2);
var linearMask = 1;
var srgbMask = 2;
if (!gl) {
testFailed("WebGL context does not exist");
} else {
testPassed("WebGL context exists");
var filters = [gl.LINEAR, gl.NEAREST];
var drawbuffersFormats = [linearMask, srgbMask, linearMask | srgbMask];
for (var ii = 0; ii < filters.length; ++ii) {
for (var jj = 0; jj < drawbuffersFormats.length; ++jj) {
blitframebuffer_srgb_and_linear_drawbuffers(gl.SRGB8_ALPHA8, drawbuffersFormats[jj], filters[ii]);
blitframebuffer_srgb_and_linear_drawbuffers(gl.RGBA8, drawbuffersFormats[jj], filters[ii]);
}
}
}
function blitframebuffer_srgb_and_linear_drawbuffers(readbufferFormat, drawbuffersFormatMask, filter) {
debug("");
debug("The filter is: " + wtu.glEnumToString(gl, filter));
debug("Read buffer format is: " + wtu.glEnumToString(gl, readbufferFormat));
var drawbuffersFormat = "\0";
if (drawbuffersFormatMask & linearMask) {
drawbuffersFormat += " linear ";
}
if (drawbuffersFormatMask & srgbMask) {
drawbuffersFormat += " srgb ";
}
debug("The test have multiple draw buffers, the images are: " + drawbuffersFormat);
var tex_srgb0 = gl.createTexture();
var tex_srgb1 = gl.createTexture();
var tex_linear0 = gl.createTexture();
var tex_linear1 = gl.createTexture();
var tex_read = gl.createTexture();
var fbo_read = gl.createFramebuffer();
var fbo_draw = gl.createFramebuffer();
// Create read buffer and feed data to the read buffer
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];
}
}
gl.bindTexture(gl.TEXTURE_2D, tex_read);
gl.texImage2D(gl.TEXTURE_2D, 0, readbufferFormat, size, size, 0, gl.RGBA, gl.UNSIGNED_BYTE, data);
gl.bindFramebuffer(gl.READ_FRAMEBUFFER, fbo_read);
gl.framebufferTexture2D(gl.READ_FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex_read, 0);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "setup read framebuffer should succeed");
// Create multiple textures. Attach them as fbo's draw buffers.
gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, fbo_draw);
var drawbuffers = [gl.NONE, gl.NONE, gl.NONE, gl.NONE];
if (drawbuffersFormatMask & srgbMask) {
gl.bindTexture(gl.TEXTURE_2D, tex_srgb0);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.SRGB8_ALPHA8, size, size, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
gl.framebufferTexture2D(gl.DRAW_FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex_srgb0, 0);
gl.bindTexture(gl.TEXTURE_2D, tex_srgb1);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.SRGB8_ALPHA8, size, size, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
gl.framebufferTexture2D(gl.DRAW_FRAMEBUFFER, gl.COLOR_ATTACHMENT2, gl.TEXTURE_2D, tex_srgb1, 0);
drawbuffers[0] = gl.COLOR_ATTACHMENT0;
drawbuffers[2] = gl.COLOR_ATTACHMENT2;
}
if (drawbuffersFormatMask & linearMask) {
gl.bindTexture(gl.TEXTURE_2D, tex_linear0);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA8, size, size, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
gl.framebufferTexture2D(gl.DRAW_FRAMEBUFFER, gl.COLOR_ATTACHMENT1, gl.TEXTURE_2D, tex_linear0, 0);
gl.bindTexture(gl.TEXTURE_2D, tex_linear1);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA8, size, size, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
gl.framebufferTexture2D(gl.DRAW_FRAMEBUFFER, gl.COLOR_ATTACHMENT3, gl.TEXTURE_2D, tex_linear1, 0);
drawbuffers[1] = gl.COLOR_ATTACHMENT1;
drawbuffers[3] = gl.COLOR_ATTACHMENT3;
}
gl.drawBuffers(drawbuffers);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "setup draw framebuffer should succeed");
if (gl.checkFramebufferStatus(gl.DRAW_FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE ||
gl.checkFramebufferStatus(gl.READ_FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE) {
testFailed("Framebuffer incomplete when setup draw framebuffer.");
return;
}
// Blit to multiple draw buffers with srgb images and linear images
var dstSize = size - 1;
gl.blitFramebuffer(0, 0, size, size, 0, 0, dstSize, dstSize, gl.COLOR_BUFFER_BIT, filter);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "blitframebuffer should succeed");
// Read pixels from srgb images and linear images
var srgbPixels0 = new Uint8Array(dstSize * dstSize * 4);
var srgbPixels1 = new Uint8Array(dstSize * dstSize * 4);
var linearPixels0 = new Uint8Array(dstSize * dstSize * 4);
var linearPixels1 = new Uint8Array(dstSize * dstSize * 4);
gl.bindFramebuffer(gl.READ_FRAMEBUFFER, fbo_draw);
if (drawbuffersFormatMask & srgbMask) {
gl.readBuffer(gl.COLOR_ATTACHMENT0);
gl.readPixels(0, 0, dstSize, dstSize, gl.RGBA, gl.UNSIGNED_BYTE, srgbPixels0);
gl.readBuffer(gl.COLOR_ATTACHMENT2);
gl.readPixels(0, 0, dstSize, dstSize, gl.RGBA, gl.UNSIGNED_BYTE, srgbPixels1);
}
if (drawbuffersFormatMask & linearMask) {
gl.readBuffer(gl.COLOR_ATTACHMENT1);
gl.readPixels(0, 0, dstSize, dstSize, gl.RGBA, gl.UNSIGNED_BYTE, linearPixels0);
gl.readBuffer(gl.COLOR_ATTACHMENT3);
gl.readPixels(0, 0, dstSize, dstSize, gl.RGBA, gl.UNSIGNED_BYTE, linearPixels1);
}
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "readpixels should succeed");
// Compare
var expectedSRGBColor = (readbufferFormat == gl.SRGB8_ALPHA8) ? color : wtu.linearToSRGB(color);
var expectedLinearColor = (readbufferFormat == gl.SRGB8_ALPHA8) ? wtu.sRGBToLinear(color) : color;
var failed = false;
for (var ii = 0; ii < dstSize; ++ii) {
for (var jj = 0; jj < dstSize; ++jj) {
var index = (ii * dstSize + jj) * 4;
if (drawbuffersFormatMask & srgbMask) {
var srgbColor0 = [srgbPixels0[index], srgbPixels0[index + 1], srgbPixels0[index + 2], srgbPixels0[index + 3]];
if (checkPixel(srgbColor0, expectedSRGBColor) == false) {
failed = true;
debug("Pixels comparison failed for the 1st sRGB image. Pixel at [" + jj + ", " + ii + "] should be (" + expectedSRGBColor + "), but the actual color is (" + srgbColor0 + ")");
}
var srgbColor1 = [srgbPixels1[index], srgbPixels1[index + 1], srgbPixels1[index + 2], srgbPixels1[index + 3]];
if (checkPixel(srgbColor1, expectedSRGBColor) == false) {
failed = true;
debug("Pixels comparison failed for the 2nd sRGB image. Pixel at [" + jj + ", " + ii + "] should be (" + expectedSRGBColor + "), but the actual color is (" + srgbColor1 + ")");
}
}
if (drawbuffersFormatMask & linearMask) {
var linearColor0 = [linearPixels0[index], linearPixels0[index + 1], linearPixels0[index + 2], linearPixels0[index + 3]];
if (checkPixel(linearColor0, expectedLinearColor) == false) {
failed = true;
debug("Pixel comparison failed for the 1st linear image. Pixel at [" + jj + ", " + ii + "] should be (" + color + "), but the actual color is (" + linearColor0 + ")");
}
var linearColor1 = [linearPixels1[index], linearPixels1[index + 1], linearPixels1[index + 2], linearPixels1[index + 3]];
if (checkPixel(linearColor1, expectedLinearColor) == false) {
failed = true;
debug("Pixel comparison failed for the 2nd linear image. Pixel at [" + jj + ", " + ii + "] should be (" + color + "), but the actual color is (" + linearColor1 + ")");
}
}
}
}
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.deleteTexture(tex_srgb0);
gl.deleteTexture(tex_linear0);
gl.deleteTexture(tex_srgb1);
gl.deleteTexture(tex_linear1);
gl.deleteTexture(tex_read);
gl.deleteFramebuffer(fbo_read);
gl.deleteFramebuffer(fbo_draw);
}
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);
}
var successfullyParsed = true;
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