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

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• Author : Jonah Ryan-Davis
  Date : 2019-12-12 13:02:01
  Hash : 806ba566
  Message : Extend ANGLE_iosurface_client_buffer to Vulkan backend for Swangle Implement an IOSurface-backed pBuffer surface for the Vulkan backend on Mac, through SwANGLE. ANGLE will pass a raw pointer to Swiftshader and handle locking/unlocking the IOSurface. Bug: chromium:1015454 Change-Id: Ia3ead55334736003d405b54ba8dcc7701706fbb2 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1965434 Commit-Queue: Jonah Ryan-Davis <jonahr@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>

• 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_
  
  #include "platform/Feature.h"
  
  namespace angle
  {
  
  struct FeaturesVk : FeatureSetBase
  {
      FeaturesVk();
      ~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.
      Feature basicGLLineRasterization = {
          "basic_gl_line_rasterization", FeatureCategory::VulkanFeatures,
          "Enable the use of pixel shader patching to implement OpenGL basic line "
          "rasterization rules",
          &members};
  
      // If the VK_EXT_line_rasterization extension is available we'll use it to get
      // Bresenham line rasterization.
      Feature bresenhamLineRasterization = {
          "bresenham_line_rasterization", FeatureCategory::VulkanFeatures,
          "Enable Bresenham line rasterization via VK_EXT_line_rasterization extension", &members};
  
      // If the VK_EXT_provoking_vertex extension is available, we'll use it to set
      // the provoking vertex mode
      Feature provokingVertex = {"provoking_vertex", FeatureCategory::VulkanFeatures,
                                 "Enable provoking vertex mode via VK_EXT_provoking_vertex extension",
                                 &members};
  
      // 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
      Feature flipViewportY = {"flip_viewport_y", FeatureCategory::VulkanFeatures,
                               "Flips the viewport to render upside-down", &members};
  
      // Add an extra copy region when using vkCmdCopyBuffer as the Windows Intel driver seems
      // to have a bug where the last region is ignored.
      Feature extraCopyBufferRegion = {
          "extra_copy_buffer_region", FeatureCategory::VulkanWorkarounds,
          "Some drivers seem to have a bug where the last copy region in vkCmdCopyBuffer is ignored",
          &members};
  
      // 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.
      Feature forceFallbackFormat = {"force_fallback_format", FeatureCategory::VulkanWorkarounds,
                                     "Force a fallback format for angle_end2end_tests", &members};
  
      // 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.
      Feature clampPointSize = {
          "clamp_point_size", FeatureCategory::VulkanWorkarounds,
          "The point size range reported from the API is inconsistent with the actual behavior",
          &members, "http://anglebug.com/2970"};
  
      // On some android devices, the memory barrier between the compute shader that converts vertex
      // attributes and the vertex shader that reads from it is ineffective.  Only known workaround is
      // to perform a flush after the conversion.  http://anglebug.com/3016
      Feature flushAfterVertexConversion = {
          "flush_after_vertex_conversion", FeatureCategory::VulkanWorkarounds,
          "The memory barrier between the compute shader that converts vertex attributes and the "
          "vertex shader that reads from it is ineffective",
          &members, "http://anglebug.com/3016"};
  
      // Whether the VkDevice supports the VK_KHR_incremental_present extension, on which the
      // EGL_KHR_swap_buffers_with_damage extension can be layered.
      Feature supportsIncrementalPresent = {
          "supports_incremental_present", FeatureCategory::VulkanFeatures,
          "VkDevice supports the VK_KHR_incremental_present extension", &members};
  
      // Whether texture copies on cube map targets should be done on GPU.  This is a workaround for
      // Intel drivers on windows that have an issue with creating single-layer views on cube map
      // textures.
      Feature forceCPUPathForCubeMapCopy = {
          "force_cpu_path_for_cube_map_copy", FeatureCategory::VulkanWorkarounds,
          "Some drivers have an issue with creating single-layer views on cube map textures",
          &members};
  
      // Whether the VkDevice supports the VK_ANDROID_external_memory_android_hardware_buffer
      // extension, on which the EGL_ANDROID_image_native_buffer extension can be layered.
      Feature supportsAndroidHardwareBuffer = {
          "supports_android_hardware_buffer", FeatureCategory::VulkanFeatures,
          "VkDevice supports the VK_ANDROID_external_memory_android_hardware_buffer extension",
          &members};
  
      // Whether the VkDevice supports the VK_KHR_external_memory_fd extension, on which the
      // GL_EXT_memory_object_fd extension can be layered.
      Feature supportsExternalMemoryFd = {
          "supports_external_memory_fd", FeatureCategory::VulkanFeatures,
          "VkDevice supports the VK_KHR_external_memory_fd extension", &members};
  
      // Whether the VkDevice supports the VK_KHR_external_semaphore_fd extension, on which the
      // GL_EXT_semaphore_fd extension can be layered.
      Feature supportsExternalSemaphoreFd = {
          "supports_external_semaphore_fd", FeatureCategory::VulkanFeatures,
          "VkDevice supports the VK_KHR_external_semaphore_fd extension", &members};
  
      // Whether the VkDevice supports the VK_EXT_shader_stencil_export extension, which is used to
      // perform multisampled resolve of stencil buffer.  A multi-step workaround is used instead if
      // this extension is not available.
      Feature supportsShaderStencilExport = {
          "supports_shader_stencil_export", FeatureCategory::VulkanFeatures,
          "VkDevice supports the VK_EXT_shader_stencil_export extension", &members};
  
      // Where VK_EXT_transform_feedback is not support, an emulation path is used.
      // http://anglebug.com/3205
      Feature emulateTransformFeedback = {
          "emulate_transform_feedback", FeatureCategory::VulkanFeatures,
          "Emulate transform feedback as the VK_EXT_transform_feedback is not present.", &members,
          "http://anglebug.com/3205"};
  
      // Where VK_EXT_transform_feedback is supported, it's preferred over an emulation path.
      // http://anglebug.com/3206
      Feature supportsTransformFeedbackExtension = {
          "supports_transform_feedback_extension", FeatureCategory::VulkanFeatures,
          "Transform feedback uses the VK_EXT_transform_feedback extension.", &members,
          "http://anglebug.com/3206"};
  
      // VK_PRESENT_MODE_FIFO_KHR causes random timeouts on Linux Intel. http://anglebug.com/3153
      Feature disableFifoPresentMode = {
          "disable_fifo_present_mode", FeatureCategory::VulkanWorkarounds,
          "VK_PRESENT_MODE_FIFO_KHR causes random timeouts", &members, "http://anglebug.com/3153"};
  
      // On Qualcomm, gaps in bound descriptor set indices causes the post-gap sets to misbehave.
      // For example, binding only descriptor set 3 results in zero being read from a uniform buffer
      // object within that set.  This flag results in empty descriptor sets being bound for any
      // unused descriptor set to work around this issue.  http://anglebug.com/2727
      Feature bindEmptyForUnusedDescriptorSets = {
          "bind_empty_for_unused_descriptor_sets", FeatureCategory::VulkanWorkarounds,
          "Gaps in bound descriptor set indices causes the post-gap sets to misbehave", &members,
          "http://anglebug.com/2727"};
  
      // OES_depth_texture is a commonly expected feature on Android. However it
      // requires that D16_UNORM support texture filtering
      // (e.g. VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_LINEAR_BIT) and some devices
      // do not. Work-around this by setting saying D16_UNORM supports filtering
      // anyway.
      Feature forceD16TexFilter = {
          "force_D16_texture_filter", FeatureCategory::VulkanWorkarounds,
          "VK_FORMAT_D16_UNORM does not support VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_LINEAR_BIT, "
          "which prevents OES_depth_texture from being supported.",
          &members, "http://anglebug.com/3452"};
  
      // On some android devices, vkCmdBlitImage with flipped coordinates blits incorrectly.  This
      // workaround makes sure this path is avoided.  http://anglebug.com/3498
      Feature disableFlippingBlitWithCommand = {
          "disable_flipping_blit_with_command", FeatureCategory::VulkanWorkarounds,
          "vkCmdBlitImage with flipped coordinates blits incorrectly.", &members,
          "http://anglebug.com/3498"};
  
      // On platform with Intel or AMD GPU, a window resizing would not trigger the vulkan driver to
      // return VK_ERROR_OUT_OF_DATE on swapchain present.  Work-around by query current window extent
      // every frame to detect a window resizing.
      // http://anglebug.com/3623, http://anglebug.com/3624, http://anglebug.com/3625
      Feature perFrameWindowSizeQuery = {
          "per_frame_window_size_query", FeatureCategory::VulkanWorkarounds,
          "Vulkan swapchain is not returning VK_ERROR_OUT_OF_DATE when window resizing", &members,
          "http://anglebug.com/3623, http://anglebug.com/3624, http://anglebug.com/3625"};
  
      // Seamful cube map emulation misbehaves on the AMD windows driver, so it's disallowed.
      Feature disallowSeamfulCubeMapEmulation = {
          "disallow_seamful_cube_map_emulation", FeatureCategory::VulkanWorkarounds,
          "Seamful cube map emulation misbehaves on some drivers, so it's disallowed", &members,
          "http://anglebug.com/3243"};
  
      // Qualcomm and SwiftShader shader compiler doesn't support sampler arrays as parameters, so
      // revert to old RewriteStructSamplers behavior, which produces fewer.
      Feature forceOldRewriteStructSamplers = {
          "force_old_rewrite_struct_samplers", FeatureCategory::VulkanWorkarounds,
          "Some shader compilers don't support sampler arrays as parameters, so revert to old "
          "RewriteStructSamplers behavior, which produces fewer.",
          &members, "http://anglebug.com/2703"};
  
      // If the robustBufferAccess feature is enabled, Vulkan considers vertex attribute accesses only
      // valid up to the last multiple of stride.  If a vertex's attribute range is such that it falls
      // within the range of the buffer, but beyond the last multiple of stride, the driver is allowed
      // to either read that range from the buffer anyway, or to return (0, 0, 0, 1).  Most drivers
      // implement the former, while amdvlk on Linux and AMD's windows driver implement the latter.
      // For the latter, this workaround limits GL_MAX_VERTEX_ATTRIB_STRIDE to a reasonable value, and
      // rounds up every buffer allocation size to be a multiple of that.
      // http://anglebug.com/2514
      Feature roundUpBuffersToMaxVertexAttribStride = {
          "round_up_buffers_to_max_vertex_attrib_stride", FeatureCategory::VulkanWorkarounds,
          "If the robustBufferAccess feature is enabled, Vulkan considers vertex attribute accesses "
          "only valid up to the last multiple of stride. If a vertex's attribute range is such that "
          "it falls within the range of the buffer, but beyond the last multiple of stride, the "
          "driver is allowed to either read that range from the buffer anyway, or to return "
          "(0, 0, 0, 1). Most drivers implement the former, while some drivers the latter. For the "
          "latter, this workaround limits GL_MAX_VERTEX_ATTRIB_STRIDE to a reasonable value, and "
          "rounds up every buffer allocation size to be a multiple of that.",
          &members, "http://anglebug.com/2848"};
  
      // Whether the VkDevice supports the VK_EXT_swapchain_colorspace extension
      // http://anglebug.com/2514
      Feature supportsSwapchainColorspace = {
          "supports_swapchain_colorspace", FeatureCategory::VulkanFeatures,
          "VkDevice supports the VK_EXT_swapchain_colorspace extension", &members,
          "http://anglebug.com/2514"};
  
      // Whether to use ANGLE's deferred command graph. http://anglebug.com/4029
      Feature commandGraph = {
          "command_graph",
          FeatureCategory::VulkanFeatures,
          "Use ANGLE's Vulkan deferred command graph.",
          &members,
      };
  
      // Whether the VkDevice supports the VK_EXT_external_memory_host extension, on which the
      // ANGLE_iosurface_client_buffer extension can be layered.
      Feature supportsExternalMemoryHost = {
          "supports_external_memory_host", FeatureCategory::VulkanFeatures,
          "VkDevice supports the VK_EXT_external_memory_host extension", &members};
  };
  
  inline FeaturesVk::FeaturesVk()  = default;
  inline FeaturesVk::~FeaturesVk() = default;
  
  }  // namespace angle
  
  #endif  // ANGLE_PLATFORM_FEATURESVK_H_