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2a63b3f860
- 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>
106 lines
2.5 KiB
Plaintext
106 lines
2.5 KiB
Plaintext
Name
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ANGLE_experimental_present_path
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Name Strings
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EGL_ANGLE_experimental_present_path
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Contributors
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Austin Kinross
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Contacts
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Austin Kinross (aukinros 'at' microsoft 'dot' com)
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Status
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Experimental
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Version
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Version 1, Jan 22 2016
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Number
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EGL Extension #XXX
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Extension Type
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EGL display extension
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Dependencies
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Requires ANGLE_platform_angle_d3d.
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Written against the wording of EGL 1.4 as modified by
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ANGLE_platform_angle_d3d.
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Overview
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This extension exposes an optimized, but potentially non-conformant,
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rendering path for ANGLE's D3D11 renderer on Windows.
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New Types
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None
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New Procedures and Functions
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None
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New Tokens
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Accepted as an attribute name in the <attrib_list> argument of
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eglGetPlatformDisplayEXT:
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EGL_EXPERIMENTAL_PRESENT_PATH_ANGLE 0x33A4
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Accepted as values for the EGL_EXPERIMENTAL_PRESENT_PATH_ANGLE attribute:
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EGL_EXPERIMENTAL_PRESENT_PATH_FAST_ANGLE 0x33A9
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EGL_EXPERIMENTAL_PRESENT_PATH_COPY_ANGLE 0x33AA
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Additions to the EGL Specification
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None.
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New Behavior
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To request a display that enables this optimized rendering path,
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the value of EGL_EXPERIMENTAL_PRESENT_PATH_ANGLE should be set to
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EGL_EXPERIMENTAL_PRESENT_PATH_FAST_ANGLE. Setting this value may impact
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OpenGL ES conformance (see Issue 1 below).
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The only valid values for the attribute
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EGL_EXPERIMENTAL_PRESENT_PATH_ANGLE are
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EGL_EXPERIMENTAL_PRESENT_PATH_FAST_ANGLE and
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EGL_EXPERIMENTAL_PRESENT_PATH_COPY_ANGLE. If any other value is specified
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then an EGL_BAD_ATTRIBUTE error is generated and EGL_NO_DISPLAY is
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returned.
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If a value for EGL_EXPERIMENTAL_PRESENT_PATH_ANGLE is specified and
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EGL_PLATFORM_ANGLE_TYPE_ANGLE is not set to
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EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE then an EGL_BAD_ATTRIBUTE error is
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generated and EGL_NO_DISPLAY is returned.
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If the attribute EGL_EXPERIMENTAL_PRESENT_PATH_ANGLE
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is unspecified then it is implicitly set to
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EGL_EXPERIMENTAL_PRESENT_PATH_COPY_ANGLE.
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Issues
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1) Does setting EGL_EXPERIMENTAL_PRESENT_PATH_ANGLE to be
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EGL_EXPERIMENTAL_PRESENT_PATH_FAST_ANGLE maintain OpenGL ES
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conformance?
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RESOLVED: Not necessarily, that is implementation-specific. Check then
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EGL_CONFORMANT attribute to see if the implementation supports any
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conformant EGL configs when EGL_EXPERIMENTAL_PRESENT_PATH_FAST_ANGLE
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is specified.
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Revision History
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Version 1, Jan 22 2016 (Austin Kinross)
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- Initial draft |