| <!-- |
| |
| /* |
| ** 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 |
| ** permit persons to whom the Materials are furnished to do so, subject to |
| ** the following conditions: |
| ** |
| ** The above copyright notice and this permission notice shall be included |
| ** in all copies or substantial portions of the Materials. |
| ** |
| ** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| ** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| ** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| ** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
| ** 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 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 with sRGB framebuffers."); |
| |
| var gl = wtu.create3DContext("example", undefined, 2); |
| |
| function checkPixel(color, expectedColor) { |
| var tolerance = 7; |
| 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 tex_read = gl.createTexture(); |
| var tex_draw = gl.createTexture(); |
| var fbo_read = gl.createFramebuffer(); |
| var fbo_draw = gl.createFramebuffer(); |
| var size_read = 4; |
| var size_draw = 0; |
| |
| function blitframebuffer_helper(readbufferFormat, drawbufferFormat, filter, data) { |
| // Create read framebuffer and feed data to read buffer |
| gl.bindTexture(gl.TEXTURE_2D, tex_read); |
| gl.texImage2D(gl.TEXTURE_2D, 0, readbufferFormat, size_read, size_read, 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); |
| |
| // Create draw framebuffer and feed 0 to draw buffer |
| gl.bindTexture(gl.TEXTURE_2D, tex_draw); |
| gl.texImage2D(gl.TEXTURE_2D, 0, drawbufferFormat, size_draw, size_draw, 0, gl.RGBA, gl.UNSIGNED_BYTE, null); |
| gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, fbo_draw); |
| gl.framebufferTexture2D(gl.DRAW_FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex_draw, 0); |
| |
| gl.blitFramebuffer(0, 0, size_read, size_read, 0, 0, size_draw, size_draw, gl.COLOR_BUFFER_BIT, filter); |
| |
| // Read pixels for comparision |
| var pixels = new Uint8Array(size_draw * size_draw * 4); |
| gl.bindFramebuffer(gl.READ_FRAMEBUFFER, fbo_draw); |
| gl.readPixels(0, 0, size_draw, size_draw, gl.RGBA, gl.UNSIGNED_BYTE, pixels); |
| return pixels; |
| } |
| |
| function blitframebuffer_filter_srgb(readbufferFormat, drawbufferFormat, filter, minified) { |
| debug(""); |
| debug("Test srgb filtering for blitFramebuffer, the current filter is: " + wtu.glEnumToString(gl, filter)); |
| var min_mag = minified ? "minified to half the size." : "magnified to double the size."; |
| debug("read buffer format is: " + wtu.glEnumToString(gl, readbufferFormat) + ", draw buffer format is: " + wtu.glEnumToString(gl, drawbufferFormat) + ", minify/magnify: " + min_mag); |
| |
| // Initiate data to read framebuffer |
| var src_buffer = new Uint8Array(size_read * size_read * 4); |
| var start = 0; |
| for (var ii = 0; ii < size_read * size_read * 4; ii += 4) { |
| for (var jj = 0; jj < 3; ++jj) { |
| src_buffer[ii + jj] = start; |
| } |
| src_buffer[ii + 3] = 0xff; |
| start += 0x10; |
| } |
| |
| // We may need to decode srgb to linear for reference data |
| var ref_buffer = new Uint8Array(size_read * size_read * 4); |
| for (var ii = 0; ii < size_read * size_read * 4; ii += 4) { |
| var color = [src_buffer[ii], src_buffer[ii + 1], src_buffer[ii + 2], src_buffer[ii + 3]]; |
| var ref_color; |
| if (readbufferFormat == gl.SRGB8_ALPHA8) { |
| ref_color = wtu.sRGBToLinear(color); |
| } else { |
| ref_color = color; |
| } |
| for (var jj = 0; jj < 4; ++jj) { |
| ref_buffer[ii + jj] = ref_color[jj]; |
| } |
| } |
| |
| // Blit framebuffer to filter srgb image, but the reference data is always retrieved by blitFramebuffer against linear image |
| size_draw = minified ? size_read / 2 : size_read * 2; |
| var pixels = blitframebuffer_helper(readbufferFormat, drawbufferFormat, filter, src_buffer); |
| var temp = blitframebuffer_helper(gl.RGBA, gl.RGBA, filter, ref_buffer); |
| |
| // We may need to encode linear to srgb for reference data |
| var ref_pixels = new Uint8Array(size_draw * size_draw * 4); |
| for (var ii = 0; ii < size_draw * size_draw * 4; ii += 4) { |
| var color = [temp[ii], temp[ii + 1], temp[ii + 2], temp[ii + 3]]; |
| var ref_color; |
| if (drawbufferFormat == gl.SRGB8_ALPHA8) { |
| ref_color = wtu.linearToSRGB(color); |
| } else { |
| ref_color = color; |
| } |
| for (var jj = 0; jj < 4; ++jj) { |
| ref_pixels[ii + jj] = ref_color[jj]; |
| } |
| } |
| |
| // Compare |
| for (var ii = 0; ii < size_draw; ++ii) { |
| for (var jj = 0; jj < size_draw; ++jj) { |
| var index = ii * size_draw * 4 + jj; |
| var color = [pixels[index], pixels[index + 1], pixels[index + 2], pixels[index + 3]]; |
| var expectedColor = [ref_pixels[index], ref_pixels[index + 1], ref_pixels[index + 2], ref_pixels[index + 3]]; |
| if (checkPixel(color, expectedColor) == true) { |
| testPassed("pixel at [" + jj + ", " + ii + "] is (" + color + "). It is correct!"); |
| } else { |
| testFailed("pixel at [" + jj + ", " + ii + "] should be (" + expectedColor + "), but the actual color is (" + color + ")"); |
| } |
| } |
| } |
| } |
| |
| if (!gl) { |
| testFailed("WebGL context does not exist"); |
| } else { |
| testPassed("WebGL context exists"); |
| var filters = [gl.LINEAR, gl.NEAREST]; |
| for (var ii = 0; ii < filters.length; ++ii) { |
| blitframebuffer_filter_srgb(gl.RGBA8, gl.SRGB8_ALPHA8, filters[ii], true); |
| blitframebuffer_filter_srgb(gl.RGBA8, gl.SRGB8_ALPHA8, filters[ii], false); |
| blitframebuffer_filter_srgb(gl.SRGB8_ALPHA8, gl.RGBA8, filters[ii], true); |
| blitframebuffer_filter_srgb(gl.SRGB8_ALPHA8, gl.RGBA8, filters[ii], false); |
| blitframebuffer_filter_srgb(gl.SRGB8_ALPHA8, gl.SRGB8_ALPHA8, filters[ii], true); |
| blitframebuffer_filter_srgb(gl.SRGB8_ALPHA8, gl.SRGB8_ALPHA8, filters[ii], false); |
| } |
| } |
| |
| 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> |
| <script src="../../js/js-test-post.js"></script> |
| |
| </body> |
| </html> |