Fix undefined behaviour in ClearTest.

We were expecting an uninitialized texture to contain black. However the contents of the texture data may be undefined. Discovered when working with the Vulkan command stream refactor. Bug: angleproject:4029 Change-Id: Ia5d24707746819b116ac0053fabb48033574569a Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2017978Reviewed-by: Jonah Ryan-Davis <jonahr@google.com> Commit-Queue: Jamie Madill <jmadill@chromium.org>

Fix undefined behaviour in ClearTest.
0a3f58f1 · Jamie Madill · Commit Bot · c67252ea · 0a3f58f1
Commit 0a3f58f1 authored Jan 24, 2020 by Jamie Madill Committed by Commit Bot Jan 24, 2020
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ClearTest.cpp src/tests/gl_tests/ClearTest.cpp +6 -2

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--- a/src/tests/gl_tests/ClearTest.cpp
+++ b/src/tests/gl_tests/ClearTest.cpp
@@ -393,13 +393,17 @@ TEST_P(ClearTest, ChangeFramebufferAttachmentFromRGBAtoRGB)
    glBindFramebuffer(GL_FRAMEBUFFER, mFBOs[0]);
    GLTexture texture;
-    glColorMask(GL_TRUE, GL_FALSE, GL_TRUE, GL_TRUE);
    glBindTexture(GL_TEXTURE_2D, texture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, getWindowWidth(), getWindowHeight(), 0, GL_RGBA,
                 GL_UNSIGNED_BYTE, nullptr);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0);
+    // Initially clear to black.
+    glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
+    glClear(GL_COLOR_BUFFER_BIT);
+    // Clear with masked color.
+    glColorMask(GL_TRUE, GL_FALSE, GL_TRUE, GL_TRUE);
    glClearColor(0.5f, 0.5f, 0.5f, 0.75f);
    glClear(GL_COLOR_BUFFER_BIT);
    ASSERT_GL_NO_ERROR();