Snap for 11216811 from 567b03662dad18c49359cfb45ac51a2a9662c8e8 to 24Q1-release
Change-Id: Ifb7188533e7830401beff7ee3c097aa247d2c430
diff --git a/modules/egl/teglGetFrameTimestampsTests.cpp b/modules/egl/teglGetFrameTimestampsTests.cpp
index f846e97..0147748 100644
--- a/modules/egl/teglGetFrameTimestampsTests.cpp
+++ b/modules/egl/teglGetFrameTimestampsTests.cpp
@@ -597,6 +597,30 @@
gl.enableVertexAttribArray(posLocation);
GLU_EXPECT_NO_ERROR(gl.getError(), "Failed to setup shader program for rendering");
+ // Do extra rendering to allow frame pacing to stabilize.
+ // The frame timestamp validation below assumes there is no frame janking,
+ // however, this is not guaranteed.
+ // e.g. on some hardware, the shader compilation causes first few frames
+ // to jank. This will cause frame timestamps read back not matching with
+ // expectations: compositeToPresentLatency < 4 * compositeInterval.
+ // Do extra frames rendering to allow frames to stablize before measuring
+ // and verifying frame timestamps.
+ const size_t stablizeFramesCount = 120;
+ for (size_t i = 0; i< stablizeFramesCount; ++i)
+ {
+ gl.clearColor(0.0f, 0.0f, 0.0f, 1.0f);
+ gl.clear(GL_COLOR_BUFFER_BIT);
+ GLU_EXPECT_NO_ERROR(gl.getError(), "Failed to clear surface");
+
+ const bool posSelect = ((i % 2) == 0);
+ gl.vertexAttribPointer(posLocation, 2, GL_FLOAT, GL_FALSE, 0, posSelect ? positions1 : positions2);
+
+ gl.drawArrays(GL_TRIANGLES, 0, 6);
+ GLU_EXPECT_NO_ERROR(gl.getError(), "Failed to render");
+
+ EGLU_CHECK_CALL(egl, swapBuffers(display, *surface));
+ }
+
const size_t frameCount = 120;
std::vector<FrameTimes> frameTimes(frameCount);
for (size_t i = 0; i < frameCount; i++)
