Fix ShaderStorageBufferReadWriteOffset end2end test

Test: ShaderStorageBufferTest31.ShaderStorageBufferReadWriteOffset. Align kBufferOffset to bufferAlignOffset correctly. Bug: angleproject:4471 Change-Id: I71084839a845138b32d58d8bd2cf6fed2633a9be Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2100047 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>

Fix ShaderStorageBufferReadWriteOffset end2end test
f98084ed · Amy Liu · Commit Bot · 273f9c7c · f98084ed
Commit f98084ed authored Mar 12, 2020 by Amy Liu Committed by Commit Bot Mar 17, 2020
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ShaderStorageBufferTest.cpp src/tests/gl_tests/ShaderStorageBufferTest.cpp +3 -1

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--- a/src/tests/gl_tests/ShaderStorageBufferTest.cpp
+++ b/src/tests/gl_tests/ShaderStorageBufferTest.cpp
@@ -444,7 +444,9 @@ void main()
    glGetIntegerv(GL_SHADER_STORAGE_BUFFER_OFFSET_ALIGNMENT, &bufferAlignOffset);

    constexpr int kBufferSize = kElementCount * kArrayStride;
-    const int kBufferOffset   = kBufferSize + (kBufferSize % bufferAlignOffset);
+    const int unalignedBytes  = kBufferSize % bufferAlignOffset;
+    const int alignCorrection = unalignedBytes == 0 ? 0 : bufferAlignOffset - unalignedBytes;
+    const int kBufferOffset   = kBufferSize + alignCorrection;

    glBufferData(GL_SHADER_STORAGE_BUFFER, kBufferOffset + kBufferSize, nullptr, GL_STATIC_DRAW);