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#include "precompiled.h"
//
// Copyright (c) 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.
//
// queryconversions.cpp: Implementation of state query cast conversions
#include "libGLESv2/Context.h"
#include "common/utilities.h"
namespace gl
{
// Helper class for converting a GL type to a GLenum:
// We can't use CastStateValueEnum generally, because of GLboolean + GLubyte overlap.
// We restrict our use to CastStateValue, where it eliminates duplicate parameters.
template <typename GLType>
struct CastStateValueEnum { static GLenum mEnumForType; };
template <> GLenum CastStateValueEnum<GLint>::mEnumForType = GL_INT;
template <> GLenum CastStateValueEnum<GLuint>::mEnumForType = GL_UNSIGNED_INT;
template <> GLenum CastStateValueEnum<GLboolean>::mEnumForType = GL_BOOL;
template <> GLenum CastStateValueEnum<GLint64>::mEnumForType = GL_INT_64_ANGLEX;
template <> GLenum CastStateValueEnum<GLfloat>::mEnumForType = GL_FLOAT;
template <typename QueryT, typename NativeT>
QueryT CastStateValueToInt(GLenum pname, NativeT value)
{
GLenum queryType = CastStateValueEnum<QueryT>::mEnumForType;
GLenum nativeType = CastStateValueEnum<NativeT>::mEnumForType;
if (nativeType == GL_FLOAT)
{
// RGBA color values and DepthRangeF values are converted to integer using Equation 2.4 from Table 4.5
if (pname == GL_DEPTH_RANGE || pname == GL_COLOR_CLEAR_VALUE || pname == GL_DEPTH_CLEAR_VALUE || pname == GL_BLEND_COLOR)
{
return static_cast<QueryT>((static_cast<GLfloat>(0xFFFFFFFF) * value - 1.0f) / 2.0f);
}
else
{
return gl::iround<QueryT>(value);
}
}
// Clamp 64-bit int values when casting to int
if (nativeType == GL_INT_64_ANGLEX && queryType == GL_INT)
{
GLint64 minIntValue = static_cast<GLint64>(std::numeric_limits<GLint>::min());
GLint64 maxIntValue = static_cast<GLint64>(std::numeric_limits<GLint>::max());
GLint64 clampedValue = std::max(std::min(static_cast<GLint64>(value), maxIntValue), minIntValue);
return static_cast<QueryT>(clampedValue);
}
return static_cast<QueryT>(value);
}
template <typename QueryT, typename NativeT>
QueryT CastStateValue(GLenum pname, NativeT value)
{
GLenum queryType = CastStateValueEnum<QueryT>::mEnumForType;
switch (queryType)
{
case GL_INT: return CastStateValueToInt<QueryT, NativeT>(pname, value);
case GL_INT_64_ANGLEX: return CastStateValueToInt<QueryT, NativeT>(pname, value);
case GL_FLOAT: return static_cast<QueryT>(value);
case GL_BOOL: return (value == static_cast<NativeT>(0) ? GL_FALSE : GL_TRUE);
default: UNREACHABLE(); return 0;
}
}
template <typename QueryT>
void CastStateValues(Context *context, GLenum nativeType, GLenum pname,
unsigned int numParams, QueryT *outParams)
{
if (nativeType == GL_INT)
{
GLint *intParams = NULL;
intParams = new GLint[numParams];
context->getIntegerv(pname, intParams);
for (unsigned int i = 0; i < numParams; ++i)
{
outParams[i] = CastStateValue<QueryT>(pname, intParams[i]);
}
delete [] intParams;
}
else if (nativeType == GL_BOOL)
{
GLboolean *boolParams = NULL;
boolParams = new GLboolean[numParams];
context->getBooleanv(pname, boolParams);
for (unsigned int i = 0; i < numParams; ++i)
{
outParams[i] = (boolParams[i] == GL_FALSE ? static_cast<QueryT>(0) : static_cast<QueryT>(1));
}
delete [] boolParams;
}
else if (nativeType == GL_FLOAT)
{
GLfloat *floatParams = NULL;
floatParams = new GLfloat[numParams];
context->getFloatv(pname, floatParams);
for (unsigned int i = 0; i < numParams; ++i)
{
outParams[i] = CastStateValue<QueryT>(pname, floatParams[i]);
}
delete [] floatParams;
}
else if (nativeType == GL_INT_64_ANGLEX)
{
GLint64 *int64Params = NULL;
int64Params = new GLint64[numParams];
context->getInteger64v(pname, int64Params);
for (unsigned int i = 0; i < numParams; ++i)
{
outParams[i] = CastStateValue<QueryT>(pname, int64Params[i]);
}
delete [] int64Params;
}
else UNREACHABLE();
}
// Explicit template instantiation (how we export template functions in different files)
// The calls below will make CastStateValues successfully link with the GL state query types
// The GL state query API types are: bool, int, uint, float, int64
template void CastStateValues<GLboolean>(Context *, GLenum, GLenum, unsigned int, GLboolean *);
template void CastStateValues<GLint>(Context *, GLenum, GLenum, unsigned int, GLint *);
template void CastStateValues<GLuint>(Context *, GLenum, GLenum, unsigned int, GLuint *);
template void CastStateValues<GLfloat>(Context *, GLenum, GLenum, unsigned int, GLfloat *);
template void CastStateValues<GLint64>(Context *, GLenum, GLenum, unsigned int, GLint64 *);
}
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