gl_tests:DrawArraysThenDrawElements: glFinish instead of swap

Later in the test we read from the backbuffer to confirm that the triangles were drawn correctly, but without EGL_BUFFER_PRESERVED the content of the backbuffer is undefined. Since glReadBuffer is not supported in GLES2 don't swap, instead to a glFinish to force the drawing in each iteration. Bug: angleproject:6088 Change-Id: Iac485cc6ec92626a74a4428bcdb32cc535a2691f Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2982112Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Gert Wollny <gert.wollny@collabora.com>

gl_tests:DrawArraysThenDrawElements: glFinish instead of swap
13ac4dfb · Gert Wollny · Angle LUCI CQ · 15623ada · 13ac4dfb
Commit 13ac4dfb authored Jun 23, 2021 by Gert Wollny Committed by Angle LUCI CQ Jun 23, 2021
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StateChangeTest.cpp src/tests/gl_tests/StateChangeTest.cpp +1 -1

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--- a/src/tests/gl_tests/StateChangeTest.cpp
+++ b/src/tests/gl_tests/StateChangeTest.cpp
@@ -1728,7 +1728,7 @@ TEST_P(SimpleStateChangeTest, DrawArraysThenDrawElements)
        glClear(GL_COLOR_BUFFER_BIT);
        glDrawArrays(GL_TRIANGLES, 0, 3);                             // triangle to the left
        glDrawElements(GL_TRIANGLES, 3, GL_UNSIGNED_SHORT, nullptr);  // triangle to the right
-        swapBuffers();
+        glFinish();
    }
    glDisableVertexAttribArray(positionLocation);