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Hash : 2a63b3f8
Author :
Date : 2016-02-08T12:29:08
Re-land "Implement EGL_experimental_present_path_angle" - Re-land with clang fix. This allows ANGLE to render directly onto a D3D swapchain in the correct orientation when using the D3D11 renderer. The trick is to add an extra uniform to each shader which takes either the value +1.0 or -1.0. When rendering to a texture, ANGLE sets this value to -1.0. When rendering to the default framebuffer, ANGLE sets this value to +1.0. ANGLE multiplies vertex positions by this value in the VS to invert rendering when appropriate. It also corrects other state (e.g. viewport/scissor rect) and shader built-in values (e.g. gl_FragCoord). This saves a substantial amount of GPU time and lowers power consumption. For example, the old method (where ANGLE renders all content onto an offscreen texture, and then copies/inverts this onto the swapchain at eglSwapBuffers() time) uses about 20% of the GPU each frame on a Lumia 630. Verification: + dEQP GL ES2 tests pass when "present path fast" is enabled + all ANGLE_end2end_tests pass when "present path fast" is enabled BUG=angleproject:1219 Change-Id: I56b339897828753a616d7bae837a2f354dba9c63 Reviewed-on: https://chromium-review.googlesource.com/326730 Tryjob-Request: Austin Kinross <aukinros@microsoft.com> Reviewed-by: Corentin Wallez <cwallez@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>
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Files
- EGLWindow.cpp
- EGLWindow.h
- Event.h
- Matrix.cpp
- Matrix.h
- OSPixmap.h
- OSWindow.cpp
- OSWindow.h
- Timer.h
- Vector.cpp
- Vector.h
- com_utils.h
- geometry_utils.cpp
- geometry_utils.h
- keyboard.h
- linux/
- mouse.h
- osx/
- posix/
- random_utils.cpp
- random_utils.h
- shader_utils.cpp
- shader_utils.h
- system_utils.h
- util.gyp
- windows/
- x11/
