kc3-lang/angle/include/platform/FeaturesVk.h

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• Hash : fde74c07
  Author :
  Date : 2018-11-18T16:12:02
  

  Vulkan: Apply point size clamping workaround in NV.
  
  It seems to be a regression in recent drivers. Olli contributed this
  workaround for the GL back-end some time ago. This CL enables it for
  Vulkan as well on the affected drivers.
  
  Bug: angleproject:2970
  Change-Id: I37f0caf8d9db073cb880aa1500d1ff7a1eee9d34
  Reviewed-on: https://chromium-review.googlesource.com/c/1341108
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  

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• include/platform/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.
  //
  // FeaturesVk.h: Optional features for the Vulkan renderer.
  //
  
  #ifndef ANGLE_PLATFORM_FEATURESVK_H_
  #define ANGLE_PLATFORM_FEATURESVK_H_
  
  namespace angle
  {
  
  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;
  
      // Add an extra copy region when using vkCmdCopyBuffer as the Windows Intel driver seems
      // to have a bug where the last region is ignored.
      bool extraCopyBufferRegion = false;
  
      // This flag is added for the sole purpose of end2end tests, to test the correctness
      // of various algorithms when a fallback format is used, such as using a packed format to
      // emulate a depth- or stencil-only format.
      bool forceFallbackFormat = false;
  
      // On some NVIDIA drivers the point size range reported from the API is inconsistent with the
      // actual behavior. Clamp the point size to the value from the API to fix this.
      // Tracked in http://anglebug.com/2970.
      bool clampPointSize = false;
  };
  
  }  // namespace angle
  
  #endif  // ANGLE_PLATFORM_FEATURESVK_H_
  

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