kc3-lang/angle/src/libANGLE/VertexAttribute.cpp

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• Author : Geoff Lang
  Date : 2017-05-30 16:19:23
  Hash : 9ab5b822
  Message : Validate that vertex shader input matches the vertex attribute types. BUG=angleproject:2012 TEST=conformance2/rendering/attrib-type-match Change-Id: Ic282e0933a5c3c377322dd484534fcc1dfcb3840 Reviewed-on: https://chromium-review.googlesource.com/517974 Commit-Queue: Geoff Lang <geofflang@chromium.org> Reviewed-by: Frank Henigman <fjhenigman@chromium.org>

• src/libANGLE/VertexAttribute.cpp

• //
  // Copyright 2014 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.
  //
  // Implementation of the state classes for mananging GLES 3.1 Vertex Array Objects.
  //
  
  #include "libANGLE/VertexAttribute.h"
  
  namespace gl
  {
  
  // [OpenGL ES 3.1] (November 3, 2016) Section 20 Page 361
  // Table 20.2: Vertex Array Object State
  VertexBinding::VertexBinding() : stride(16u), divisor(0), offset(0)
  {
  }
  
  VertexBinding::VertexBinding(VertexBinding &&binding)
  {
      *this = std::move(binding);
  }
  
  VertexBinding &VertexBinding::operator=(VertexBinding &&binding)
  {
      if (this != &binding)
      {
          stride  = binding.stride;
          divisor = binding.divisor;
          offset  = binding.offset;
  
          buffer.set(binding.buffer.get());
          binding.buffer.set(nullptr);
      }
      return *this;
  }
  
  VertexAttribute::VertexAttribute(GLuint bindingIndex)
      : enabled(false),
        type(GL_FLOAT),
        size(4u),
        normalized(false),
        pureInteger(false),
        pointer(nullptr),
        relativeOffset(0),
        vertexAttribArrayStride(0),
        bindingIndex(bindingIndex)
  {
  }
  
  VertexAttribute::VertexAttribute(VertexAttribute &&attrib)
      : enabled(attrib.enabled),
        type(attrib.type),
        size(attrib.size),
        normalized(attrib.normalized),
        pureInteger(attrib.pureInteger),
        pointer(attrib.pointer),
        relativeOffset(attrib.relativeOffset),
        vertexAttribArrayStride(attrib.vertexAttribArrayStride),
        bindingIndex(attrib.bindingIndex)
  {
  }
  
  VertexAttribute &VertexAttribute::operator=(VertexAttribute &&attrib)
  {
      if (this != &attrib)
      {
          enabled                 = attrib.enabled;
          type                    = attrib.type;
          size                    = attrib.size;
          normalized              = attrib.normalized;
          pureInteger             = attrib.pureInteger;
          pointer                 = attrib.pointer;
          relativeOffset          = attrib.relativeOffset;
          vertexAttribArrayStride = attrib.vertexAttribArrayStride;
          bindingIndex            = attrib.bindingIndex;
      }
      return *this;
  }
  
  size_t ComputeVertexAttributeTypeSize(const VertexAttribute& attrib)
  {
      GLuint size = attrib.size;
      switch (attrib.type)
      {
        case GL_BYTE:                        return size * sizeof(GLbyte);
        case GL_UNSIGNED_BYTE:               return size * sizeof(GLubyte);
        case GL_SHORT:                       return size * sizeof(GLshort);
        case GL_UNSIGNED_SHORT:              return size * sizeof(GLushort);
        case GL_INT:                         return size * sizeof(GLint);
        case GL_UNSIGNED_INT:                return size * sizeof(GLuint);
        case GL_INT_2_10_10_10_REV:          return 4;
        case GL_UNSIGNED_INT_2_10_10_10_REV: return 4;
        case GL_FIXED:                       return size * sizeof(GLfixed);
        case GL_HALF_FLOAT:                  return size * sizeof(GLhalf);
        case GL_FLOAT:                       return size * sizeof(GLfloat);
        default: UNREACHABLE();              return size * sizeof(GLfloat);
      }
  }
  
  size_t ComputeVertexAttributeStride(const VertexAttribute &attrib, const VertexBinding &binding)
  {
      // In ES 3.1, VertexAttribPointer will store the type size in the binding stride.
      // Hence, rendering always uses the binding's stride.
      return attrib.enabled ? binding.stride : 16u;
  }
  
  // Warning: you should ensure binding really matches attrib.bindingIndex before using this function.
  GLintptr ComputeVertexAttributeOffset(const VertexAttribute &attrib, const VertexBinding &binding)
  {
      return attrib.relativeOffset + binding.offset;
  }
  
  size_t ComputeVertexBindingElementCount(const VertexBinding &binding,
                                          size_t drawCount,
                                          size_t instanceCount)
  {
      // For instanced rendering, we draw "instanceDrawCount" sets of "vertexDrawCount" vertices.
      //
      // A vertex attribute with a positive divisor loads one instanced vertex for every set of
      // non-instanced vertices, and the instanced vertex index advances once every "mDivisor"
      // instances.
      if (instanceCount > 0 && binding.divisor > 0)
      {
          // When instanceDrawCount is not a multiple attrib.divisor, the division must round up.
          // For instance, with 5 non-instanced vertices and a divisor equal to 3, we need 2 instanced
          // vertices.
          return (instanceCount + binding.divisor - 1u) / binding.divisor;
      }
  
      return drawCount;
  }
  
  GLenum GetVertexAttributeBaseType(const VertexAttribute &attrib)
  {
      if (attrib.pureInteger)
      {
          switch (attrib.type)
          {
              case GL_BYTE:
              case GL_SHORT:
              case GL_INT:
                  return GL_INT;
  
              case GL_UNSIGNED_BYTE:
              case GL_UNSIGNED_SHORT:
              case GL_UNSIGNED_INT:
                  return GL_UNSIGNED_INT;
  
              default:
                  UNREACHABLE();
                  return GL_NONE;
          }
      }
      else
      {
          return GL_FLOAT;
      }
  }
  
  }  // namespace gl