kc3-lang/angle/src/libANGLE/Constants.h

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• Hash : d37992d1
  Author :
  Date : 2019-10-04T10:13:23
  

  Vulkan: Prevent Creating ES 3.0 Context if Min. Caps. Not Met
  
  ANGLE should not allow creating an ES 3.0 context if the device's
  maxPerStageDescriptorUniformBuffers or maxVertexOutputComponents
  values are too low to support the necessary minimums for GLES 3.0.
  
  Bug: angleproject:3938
  Test: CQ
  Change-Id: I4fce841d1f364c1aef1a883fa5edb64a4b93f08e
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1841971
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Commit-Queue: Tim Van Patten <timvp@google.com>
  

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• src/libANGLE/Constants.h

• //
  // Copyright 2013 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.
  //
  
  // Contants.h: Defines some implementation specific and gl constants
  
  #ifndef LIBANGLE_CONSTANTS_H_
  #define LIBANGLE_CONSTANTS_H_
  
  #include "common/platform.h"
  
  #include <stdint.h>
  
  namespace gl
  {
  
  // The binary cache is currently left disable by default, and the application can enable it.
  const size_t kDefaultMaxProgramCacheMemoryBytes = 0;
  
  enum
  {
      // Implementation upper limits, real maximums depend on the hardware
      MAX_SAMPLE_MASK_WORDS = 2,
  
      MAX_VERTEX_ATTRIBS         = 16,
      MAX_VERTEX_ATTRIB_BINDINGS = 16,
  
      // Implementation upper limits, real maximums depend on the hardware
      IMPLEMENTATION_MAX_VARYING_VECTORS = 32,
      IMPLEMENTATION_MAX_DRAW_BUFFERS    = 8,
      IMPLEMENTATION_MAX_FRAMEBUFFER_ATTACHMENTS =
          IMPLEMENTATION_MAX_DRAW_BUFFERS + 2,  // 2 extra for depth and/or stencil buffers
  
      IMPLEMENTATION_MAX_VERTEX_SHADER_UNIFORM_BUFFERS   = 16,
      IMPLEMENTATION_MAX_GEOMETRY_SHADER_UNIFORM_BUFFERS = 16,
      IMPLEMENTATION_MAX_FRAGMENT_SHADER_UNIFORM_BUFFERS = 16,
      IMPLEMENTATION_MAX_COMPUTE_SHADER_UNIFORM_BUFFERS  = 16,
      // GL_EXT_geometry_shader increases the minimum value of GL_MAX_COMBINED_UNIFORM_BLOCKS to 36.
      IMPLEMENTATION_MAX_COMBINED_SHADER_UNIFORM_BUFFERS = 36,
  
      // GL_EXT_geometry_shader increases the minimum value of GL_MAX_UNIFORM_BUFFER_BINDINGS to 48.
      IMPLEMENTATION_MAX_UNIFORM_BUFFER_BINDINGS = 48,
  
      // Transform feedback limits set to the minimum required by the spec.
      IMPLEMENTATION_MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS = 128,
      IMPLEMENTATION_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS       = 4,
      IMPLEMENTATION_MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS    = 4,
      IMPLEMENTATION_MAX_TRANSFORM_FEEDBACK_BUFFERS                = 4,
  
      // Maximum number of views which are supported by the implementation of ANGLE_multiview.
      IMPLEMENTATION_ANGLE_MULTIVIEW_MAX_VIEWS = 4,
  
      // These are the maximums the implementation can support
      // The actual GL caps are limited by the device caps
      // and should be queried from the Context
      IMPLEMENTATION_MAX_2D_TEXTURE_SIZE         = 32768,
      IMPLEMENTATION_MAX_CUBE_MAP_TEXTURE_SIZE   = 32768,
      IMPLEMENTATION_MAX_3D_TEXTURE_SIZE         = 16384,
      IMPLEMENTATION_MAX_2D_ARRAY_TEXTURE_LAYERS = 2048,
  
      // 1+log2 of max of MAX_*_TEXTURE_SIZE
      IMPLEMENTATION_MAX_TEXTURE_LEVELS = 16,
  
      // Limit active textures so we can use fast bitsets.
      IMPLEMENTATION_MAX_SHADER_TEXTURES = 32,
      IMPLEMENTATION_MAX_ACTIVE_TEXTURES = IMPLEMENTATION_MAX_SHADER_TEXTURES * 2,
      IMPLEMENTATION_MAX_IMAGE_UNITS     = IMPLEMENTATION_MAX_ACTIVE_TEXTURES,
  
      // Maximum number of slots allocated for atomic counter buffers.
      IMPLEMENTATION_MAX_ATOMIC_COUNTER_BUFFERS = 8,
  
      // Implementation upper limits, real maximums depend on the hardware.
      IMPLEMENTATION_MAX_SHADER_STORAGE_BUFFER_BINDINGS = 64,
  };
  
  namespace limits
  {
  // Some of the minimums required by GL, used to detect if the backend meets the minimum requirement.
  // Currently, there's no need to separate these values per spec version.
  constexpr uint32_t kMinimumComputeStorageBuffers = 4;
  
  // OpenGL ES 3.0+ Minimum Values
  // Table 6.31 MAX_VERTEX_UNIFORM_BLOCKS minimum value = 12
  // Table 6.32 MAX_FRAGMENT_UNIFORM_BLOCKS minimum value = 12
  constexpr uint32_t kMinimumShaderUniformBlocks = 12;
  // Table 6.31 MAX_VERTEX_OUTPUT_COMPONENTS minimum value = 64
  constexpr uint32_t kMinimumVertexOutputComponents = 64;
  }  // namespace limits
  
  }  // namespace gl
  
  #endif  // LIBANGLE_CONSTANTS_H_
  

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