kc3-lang/angle/src/libANGLE/renderer/vulkan/FeaturesVk.h

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• Hash : bf6dc379
  Author :
  Date : 2018-06-28T15:24:19
  

  Vulkan: Flip viewport on y for the backbuffer only
  
  - Hide the implementation behind a feature flag, currently
  disabled permanently as I'm working on fixing the different
  failures.
  - SimpleOperationTest.* passing
  
  Bug: angleproject:2673
  Change-Id: Ic86520c3cc478d62bebbaeaf4c6b33c439a67b0f
  Reviewed-on: https://chromium-review.googlesource.com/1119089
  Commit-Queue: Luc Ferron <lucferron@chromium.org>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  

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• src/libANGLE/renderer/vulkan/FeaturesVk.h

• //
  // Copyright 2018 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  // vk_helpers:
  //   Optional features for the Vulkan renderer.
  
  #ifndef LIBANGLE_RENDERER_VULKAN_FEATURESVK_H_
  #define LIBANGLE_RENDERER_VULKAN_FEATURESVK_H_
  
  namespace rx
  {
  struct FeaturesVk
  {
      // Line segment rasterization must follow OpenGL rules. This means using an algorithm similar
      // to Bresenham's. Vulkan uses a different algorithm. This feature enables the use of pixel
      // shader patching to implement OpenGL basic line rasterization rules. This feature will
      // normally always be enabled. Exposing it as an option enables performance testing.
      bool basicGLLineRasterization = false;
  
      // Flips the viewport to render upside-down. This has the effect to render the same way as
      // OpenGL. If this feature gets enabled, we enable the KHR_MAINTENANCE_1 extension to allow
      // negative viewports. We inverse rendering to the backbuffer by reversing the height of the
      // viewport and increasing Y by the height. So if the viewport was (0,0,width,height), it
      // becomes (0, height, width, -height). Unfortunately, when we start doing this, we also need
      // to adjust a lot of places since the rendering now happens upside-down. Affected places so
      // far:
      // -readPixels
      // -copyTexImage
      // -framebuffer blit
      // -generating mipmaps
      // -Point sprites tests
      // -texStorage
      bool flipViewportY = false;
  };
  }  // namespace rx
  
  #endif  // LIBANGLE_RENDERER_VULKAN_FEATURESVK_H_

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