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//
// Copyright (c) 2002-2010 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.
//
#ifndef _BASICTYPES_INCLUDED_
#define _BASICTYPES_INCLUDED_
//
// Precision qualifiers
//
enum TPrecision
{
// These need to be kept sorted
EbpUndefined,
EbpLow,
EbpMedium,
EbpHigh
};
inline const char* getPrecisionString(TPrecision p)
{
switch(p)
{
case EbpHigh: return "highp"; break;
case EbpMedium: return "mediump"; break;
case EbpLow: return "lowp"; break;
default: return "mediump"; break; // Safest fallback
}
}
//
// Basic type. Arrays, vectors, etc., are orthogonal to this.
//
enum TBasicType
{
EbtVoid,
EbtFloat,
EbtInt,
EbtBool,
EbtGuardSamplerBegin, // non type: see implementation of IsSampler()
EbtSampler2D,
EbtSamplerCube,
EbtSamplerExternalOES, // Only valid if OES_EGL_image_external exists.
EbtSampler2DRect, // Only valid if GL_ARB_texture_rectangle exists.
EbtGuardSamplerEnd, // non type: see implementation of IsSampler()
EbtStruct,
EbtAddress, // should be deprecated??
EbtInvariant // used as a type when qualifying a previously declared variable as being invariant
};
inline const char* getBasicString(TBasicType t)
{
switch (t)
{
case EbtVoid: return "void"; break;
case EbtFloat: return "float"; break;
case EbtInt: return "int"; break;
case EbtBool: return "bool"; break;
case EbtSampler2D: return "sampler2D"; break;
case EbtSamplerCube: return "samplerCube"; break;
case EbtSamplerExternalOES: return "samplerExternalOES"; break;
case EbtSampler2DRect: return "sampler2DRect"; break;
case EbtStruct: return "structure"; break;
default: return "unknown type";
}
}
inline bool IsSampler(TBasicType type)
{
return type > EbtGuardSamplerBegin && type < EbtGuardSamplerEnd;
}
//
// Qualifiers and built-ins. These are mainly used to see what can be read
// or written, and by the machine dependent translator to know which registers
// to allocate variables in. Since built-ins tend to go to different registers
// than varying or uniform, it makes sense they are peers, not sub-classes.
//
enum TQualifier
{
EvqTemporary, // For temporaries (within a function), read/write
EvqGlobal, // For globals read/write
EvqInternal, // For internal use, not visible to the user
EvqConst, // User defined constants and non-output parameters in functions
EvqAttribute, // Readonly
EvqVaryingIn, // readonly, fragment shaders only
EvqVaryingOut, // vertex shaders only read/write
EvqInvariantVaryingIn, // readonly, fragment shaders only
EvqInvariantVaryingOut, // vertex shaders only read/write
EvqUniform, // Readonly, vertex and fragment
// parameters
EvqIn,
EvqOut,
EvqInOut,
EvqConstReadOnly,
// built-ins written by vertex shader
EvqPosition,
EvqPointSize,
// built-ins read by fragment shader
EvqFragCoord,
EvqFrontFacing,
EvqPointCoord,
// built-ins written by fragment shader
EvqFragColor,
EvqFragData,
EvqFragDepth,
// end of list
EvqLast
};
//
// This is just for debug print out, carried along with the definitions above.
//
inline const char* getQualifierString(TQualifier q)
{
switch(q)
{
case EvqTemporary: return "Temporary"; break;
case EvqGlobal: return "Global"; break;
case EvqConst: return "const"; break;
case EvqConstReadOnly: return "const"; break;
case EvqAttribute: return "attribute"; break;
case EvqVaryingIn: return "varying"; break;
case EvqVaryingOut: return "varying"; break;
case EvqInvariantVaryingIn: return "invariant varying"; break;
case EvqInvariantVaryingOut:return "invariant varying"; break;
case EvqUniform: return "uniform"; break;
case EvqIn: return "in"; break;
case EvqOut: return "out"; break;
case EvqInOut: return "inout"; break;
case EvqPosition: return "Position"; break;
case EvqPointSize: return "PointSize"; break;
case EvqFragCoord: return "FragCoord"; break;
case EvqFrontFacing: return "FrontFacing"; break;
case EvqFragColor: return "FragColor"; break;
case EvqFragData: return "FragData"; break;
case EvqFragDepth: return "FragDepth"; break;
default: return "unknown qualifier";
}
}
#endif // _BASICTYPES_INCLUDED_
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