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

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• Hash : dadd1986
  Author :
  Date : 2020-04-21T01:50:00
  

  Implement GL_APPLE_clip_distance
  
  - Built-in variable gl_ClipDistance has been added to compiler.
  - Desktop GL: gl_ClipDistance is supported since GL 3.0. Enable/Disable
  each gl_ClipDistances[i] works out of the box via glEnable().
  - Vulkan/Metal: Use uniform variable to control writing to each
  gl_ClipDistance. One bit flag controls one element in the gl_ClipDistance
  array. The writing to the disabled element in vertex shader will be
  ignored, and turned into zero assignment instead.
  - Direct3D/Mobile GL: Not implemented yet.
  - Added ClipDistanceTest to gl_tests and compiler unittests.
  - GL_APPLE_clip_distance is a subset of GL_EXT_clip_cull_distance, so
  GL_EXT_clip_cull_distance could be implemented in future if needed.
  
  Bug: angleproject:4452
  Change-Id: I571ac8b56826989808a680226a04bec4cf59988e
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2084324
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  

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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,
  
      // Implementation upper limits of max number of clip distances
      IMPLEMENTATION_MAX_CLIP_DISTANCES = 32,
  };
  
  namespace limits
  {
  // Almost all drivers use 2048 (the minimum value) as GL_MAX_VERTEX_ATTRIB_STRIDE.  ANGLE advertizes
  // the same limit.
  constexpr uint32_t kMaxVertexAttribStride = 2048;
  
  // 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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