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//
// Copyright (c) 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.
//
// Helper structure describing a single vertex attribute
//
#ifndef LIBGLESV2_VERTEXATTRIBUTE_H_
#define LIBGLESV2_VERTEXATTRIBUTE_H_
#include "libGLESv2/Buffer.h"
namespace gl
{
struct VertexAttribute
{
bool enabled; // From glEnable/DisableVertexAttribArray
GLenum type;
GLuint size;
bool normalized;
bool pureInteger;
GLuint stride; // 0 means natural stride
union
{
const GLvoid *pointer;
GLintptr offset;
};
BindingPointer<Buffer> buffer; // Captured when glVertexAttribPointer is called.
GLuint divisor;
VertexAttribute();
};
template <typename T>
T QuerySingleVertexAttributeParameter(const VertexAttribute& attrib, GLenum pname)
{
switch (pname)
{
case GL_VERTEX_ATTRIB_ARRAY_ENABLED:
return static_cast<T>(attrib.enabled ? GL_TRUE : GL_FALSE);
case GL_VERTEX_ATTRIB_ARRAY_SIZE:
return static_cast<T>(attrib.size);
case GL_VERTEX_ATTRIB_ARRAY_STRIDE:
return static_cast<T>(attrib.stride);
case GL_VERTEX_ATTRIB_ARRAY_TYPE:
return static_cast<T>(attrib.type);
case GL_VERTEX_ATTRIB_ARRAY_NORMALIZED:
return static_cast<T>(attrib.normalized ? GL_TRUE : GL_FALSE);
case GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING:
return static_cast<T>(attrib.buffer.id());
case GL_VERTEX_ATTRIB_ARRAY_DIVISOR:
return static_cast<T>(attrib.divisor);
case GL_VERTEX_ATTRIB_ARRAY_INTEGER:
return static_cast<T>(attrib.pureInteger ? GL_TRUE : GL_FALSE);
default:
UNREACHABLE();
return static_cast<T>(0);
}
}
size_t ComputeVertexAttributeTypeSize(const VertexAttribute& attrib);
size_t ComputeVertexAttributeStride(const VertexAttribute& attrib);
struct VertexAttribCurrentValueData
{
union
{
GLfloat FloatValues[4];
GLint IntValues[4];
GLuint UnsignedIntValues[4];
};
GLenum Type;
void setFloatValues(const GLfloat floatValues[4])
{
for (unsigned int valueIndex = 0; valueIndex < 4; valueIndex++)
{
FloatValues[valueIndex] = floatValues[valueIndex];
}
Type = GL_FLOAT;
}
void setIntValues(const GLint intValues[4])
{
for (unsigned int valueIndex = 0; valueIndex < 4; valueIndex++)
{
IntValues[valueIndex] = intValues[valueIndex];
}
Type = GL_INT;
}
void setUnsignedIntValues(const GLuint unsignedIntValues[4])
{
for (unsigned int valueIndex = 0; valueIndex < 4; valueIndex++)
{
UnsignedIntValues[valueIndex] = unsignedIntValues[valueIndex];
}
Type = GL_UNSIGNED_INT;
}
bool operator==(const VertexAttribCurrentValueData &other)
{
return (Type == other.Type && memcmp(FloatValues, other.FloatValues, sizeof(float) * 4) == 0);
}
bool operator!=(const VertexAttribCurrentValueData &other)
{
return !(*this == other);
}
};
}
#endif // LIBGLESV2_VERTEXATTRIBUTE_H_
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