kc3-lang/angle/src/compiler/translator/Initialize.cpp

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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/compiler/translator/Initialize.cpp

• //
  // Copyright 2002 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.
  //
  
  #include "compiler/translator/Initialize.h"
  
  namespace sh
  {
  
  void InitExtensionBehavior(const ShBuiltInResources &resources, TExtensionBehavior &extBehavior)
  {
      if (resources.OES_standard_derivatives)
      {
          extBehavior[TExtension::OES_standard_derivatives] = EBhUndefined;
      }
      if (resources.OES_EGL_image_external)
      {
          extBehavior[TExtension::OES_EGL_image_external] = EBhUndefined;
      }
      if (resources.OES_EGL_image_external_essl3)
      {
          extBehavior[TExtension::OES_EGL_image_external_essl3] = EBhUndefined;
      }
      if (resources.NV_EGL_stream_consumer_external)
      {
          extBehavior[TExtension::NV_EGL_stream_consumer_external] = EBhUndefined;
      }
      if (resources.ARB_texture_rectangle)
      {
          // Special: ARB_texture_rectangle extension does not follow the standard for #extension
          // directives - it is enabled by default. An extension directive may still disable it.
          extBehavior[TExtension::ARB_texture_rectangle] = EBhEnable;
      }
      if (resources.EXT_blend_func_extended)
      {
          extBehavior[TExtension::EXT_blend_func_extended] = EBhUndefined;
      }
      if (resources.EXT_draw_buffers)
      {
          extBehavior[TExtension::EXT_draw_buffers] = EBhUndefined;
      }
      if (resources.EXT_frag_depth)
      {
          extBehavior[TExtension::EXT_frag_depth] = EBhUndefined;
      }
      if (resources.EXT_shader_texture_lod)
      {
          extBehavior[TExtension::EXT_shader_texture_lod] = EBhUndefined;
      }
      if (resources.EXT_shader_framebuffer_fetch)
      {
          extBehavior[TExtension::EXT_shader_framebuffer_fetch] = EBhUndefined;
      }
      if (resources.NV_shader_framebuffer_fetch)
      {
          extBehavior[TExtension::NV_shader_framebuffer_fetch] = EBhUndefined;
      }
      if (resources.NV_shader_noperspective_interpolation)
      {
          extBehavior[TExtension::NV_shader_noperspective_interpolation] = EBhUndefined;
      }
      if (resources.ARM_shader_framebuffer_fetch)
      {
          extBehavior[TExtension::ARM_shader_framebuffer_fetch] = EBhUndefined;
      }
      if (resources.OVR_multiview)
      {
          extBehavior[TExtension::OVR_multiview] = EBhUndefined;
      }
      if (resources.OVR_multiview2)
      {
          extBehavior[TExtension::OVR_multiview2] = EBhUndefined;
      }
      if (resources.EXT_YUV_target)
      {
          extBehavior[TExtension::EXT_YUV_target] = EBhUndefined;
      }
      if (resources.EXT_geometry_shader)
      {
          extBehavior[TExtension::EXT_geometry_shader] = EBhUndefined;
      }
      if (resources.EXT_gpu_shader5)
      {
          extBehavior[TExtension::EXT_gpu_shader5] = EBhUndefined;
      }
      if (resources.EXT_shader_non_constant_global_initializers)
      {
          extBehavior[TExtension::EXT_shader_non_constant_global_initializers] = EBhUndefined;
      }
      if (resources.OES_texture_storage_multisample_2d_array)
      {
          extBehavior[TExtension::OES_texture_storage_multisample_2d_array] = EBhUndefined;
      }
      if (resources.OES_texture_3D)
      {
          extBehavior[TExtension::OES_texture_3D] = EBhUndefined;
      }
      if (resources.ANGLE_texture_multisample)
      {
          extBehavior[TExtension::ANGLE_texture_multisample] = EBhUndefined;
      }
      if (resources.ANGLE_multi_draw)
      {
          extBehavior[TExtension::ANGLE_multi_draw] = EBhUndefined;
      }
      if (resources.ANGLE_base_vertex_base_instance)
      {
          extBehavior[TExtension::ANGLE_base_vertex_base_instance] = EBhUndefined;
      }
      if (resources.WEBGL_video_texture)
      {
          extBehavior[TExtension::WEBGL_video_texture] = EBhUndefined;
      }
      if (resources.APPLE_clip_distance)
      {
          extBehavior[TExtension::APPLE_clip_distance] = EBhUndefined;
      }
  }
  
  void ResetExtensionBehavior(const ShBuiltInResources &resources,
                              TExtensionBehavior &extBehavior,
                              const ShCompileOptions compileOptions)
  {
      for (auto &ext : extBehavior)
      {
          ext.second = EBhUndefined;
      }
      if (resources.ARB_texture_rectangle)
      {
          if (compileOptions & SH_DISABLE_ARB_TEXTURE_RECTANGLE)
          {
              // Remove ARB_texture_rectangle so it can't be enabled by extension directives.
              extBehavior.erase(TExtension::ARB_texture_rectangle);
          }
          else
          {
              // Restore ARB_texture_rectangle in case it was removed during an earlier reset.  As
              // noted above, it doesn't follow the standard for extension directives and is enabled
              // by default.
              extBehavior[TExtension::ARB_texture_rectangle] = EBhEnable;
          }
      }
  }
  
  }  // namespace sh
  

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