Input latency performance test that uses tracing.

gpu/command_buffer/service/gles2_cmd_decoder.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 #include <stdio.h>
 
 #include <algorithm>
 #include <list>
@@ skipping 3811 matching lines @@
   }
   if (ids == NULL) {
     return error::kOutOfBounds;
   }
   DoRegisterSharedIdsCHROMIUM(namespace_id, n, ids);
   return error::kNoError;
 }
 
 void GLES2DecoderImpl::DoClear(GLbitfield mask) {
   if (CheckBoundFramebuffersValid("glClear")) {
+    UNSHIPPED_TRACE_EVENT_INSTANT2("test_gpu", "DoClear", "red", clear_red_,
+                                   "green", clear_green_);
     ApplyDirtyState();
     glClear(mask);
   }
 }
 
 void GLES2DecoderImpl::DoFramebufferRenderbuffer(
     GLenum target, GLenum attachment, GLenum renderbuffertarget,
     GLuint client_renderbuffer_id) {
   FramebufferManager::FramebufferInfo* framebuffer_info =
       GetFramebufferInfoForTarget(target);
@@ skipping 288 matching lines @@
     SetGLError(GL_INVALID_OPERATION,
                "glBlitFramebufferEXT: function not available");
   }
   if (IsAngle()) {
     glBlitFramebufferANGLE(
         srcX0, srcY0, srcX1, srcY1, dstX0, dstY0, dstX1, dstY1, mask, filter);
   } else {
     glBlitFramebufferEXT(
         srcX0, srcY0, srcX1, srcY1, dstX0, dstY0, dstX1, dstY1, mask, filter);
   }
+  UNSHIPPED_TRACE_EVENT_INSTANT1("test_gpu", "DoBlit", "width", srcX1 - srcX0);

[nduca, 2011/12/21 20:24:23]

Is the idea to use this to connect a main-thread frame to a compositor-thread
frame? I have to say, i still can't quite grok the role of blit in our latency
detection flow...

[jbates, 2011/12/22 02:41:17]

Yes, exactly as you guessed. The blit represents the compositor consuming a
WebGL frame. This is done when the webgl context has MSAA -- I added a comment
to the html where it creates the context with antialias.

 }
 
 void GLES2DecoderImpl::DoRenderbufferStorageMultisample(
     GLenum target, GLsizei samples, GLenum internalformat,
     GLsizei width, GLsizei height) {
   if (!feature_info_->feature_flags().chromium_framebuffer_multisample) {
     SetGLError(GL_INVALID_OPERATION,
                "glRenderbufferStorageMultisampleEXT: function not available");
     return;
   }
@@ skipping 3071 matching lines @@
   // TODO(gman): call glShaderBinary
   return error::kNoError;
 #endif
 }
 
 error::Error GLES2DecoderImpl::HandleSwapBuffers(
     uint32 immediate_data_size, const gles2::SwapBuffers& c) {
   bool is_offscreen = !!offscreen_target_frame_buffer_.get();
   int this_frame_number = frame_number_++;
   // TRACE_EVENT for gpu tests:
-  TRACE_EVENT_INSTANT1("test_gpu", "SwapBuffers",
-                       "GLImpl", static_cast<int>(gfx::GetGLImplementation()));
+  TRACE_EVENT_INSTANT2("test_gpu", "SwapBuffers",
+                       "GLImpl", static_cast<int>(gfx::GetGLImplementation()),
+                       "width", (is_offscreen ? offscreen_size_.width() :
+                                 surface_->GetSize().width()));
   TRACE_EVENT2("gpu", "GLES2DecoderImpl::HandleSwapBuffers",
                "offscreen", is_offscreen,
                "frame", this_frame_number);
   // If offscreen then don't actually SwapBuffers to the display. Just copy
   // the rendered frame to another frame buffer.
   if (is_offscreen) {
     if (offscreen_size_ != offscreen_saved_color_texture_->size()) {
       // Workaround for NVIDIA driver bug on OS X; crbug.com/89557,
       // crbug.com/94163. TODO(kbr): figure out reproduction so Apple will
       // fix this.
@@ skipping 626 matching lines @@
 
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu