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//
// 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 "libANGLE/queryconversions.h"
#include <vector>
#include "libANGLE/Context.h"
#include "common/utilities.h"
namespace gl
{
namespace
{
GLint64 ExpandFloatToInteger(GLfloat value)
{
return static_cast<GLint64>((static_cast<double>(0xFFFFFFFFULL) * value - 1.0) / 2.0);
}
template <typename QueryT>
QueryT ClampToQueryRange(GLint64 value)
{
const GLint64 min = static_cast<GLint64>(std::numeric_limits<QueryT>::min());
const GLint64 max = static_cast<GLint64>(std::numeric_limits<QueryT>::max());
return static_cast<QueryT>(clamp(value, min, max));
}
template <typename QueryT, typename NativeT>
QueryT CastStateValueToInt(GLenum pname, NativeT value)
{
GLenum queryType = GLTypeToGLenum<QueryT>::value;
GLenum nativeType = GLTypeToGLenum<NativeT>::value;
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 ClampToQueryRange<QueryT>(ExpandFloatToInteger(static_cast<GLfloat>(value)));
}
else
{
return gl::iround<QueryT>(static_cast<GLfloat>(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 = GLTypeToGLenum<QueryT>::value;
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 static_cast<QueryT>(value == static_cast<NativeT>(0) ? GL_FALSE : GL_TRUE);
default:
UNREACHABLE();
return 0;
}
}
} // anonymous namespace
template <>
GLenum GLTypeToGLenum<GLint>::value = GL_INT;
template <>
GLenum GLTypeToGLenum<GLuint>::value = GL_UNSIGNED_INT;
template <>
GLenum GLTypeToGLenum<GLboolean>::value = GL_BOOL;
template <>
GLenum GLTypeToGLenum<GLint64>::value = GL_INT_64_ANGLEX;
template <>
GLenum GLTypeToGLenum<GLfloat>::value = GL_FLOAT;
template <typename QueryT>
void CastStateValues(Context *context, GLenum nativeType, GLenum pname,
unsigned int numParams, QueryT *outParams)
{
if (nativeType == GL_INT)
{
std::vector<GLint> intParams(numParams, 0);
context->getIntegerv(pname, intParams.data());
for (unsigned int i = 0; i < numParams; ++i)
{
outParams[i] = CastStateValue<QueryT>(pname, intParams[i]);
}
}
else if (nativeType == GL_BOOL)
{
std::vector<GLboolean> boolParams(numParams, GL_FALSE);
context->getBooleanv(pname, boolParams.data());
for (unsigned int i = 0; i < numParams; ++i)
{
outParams[i] = (boolParams[i] == GL_FALSE ? static_cast<QueryT>(0) : static_cast<QueryT>(1));
}
}
else if (nativeType == GL_FLOAT)
{
std::vector<GLfloat> floatParams(numParams, 0.0f);
context->getFloatv(pname, floatParams.data());
for (unsigned int i = 0; i < numParams; ++i)
{
outParams[i] = CastStateValue<QueryT>(pname, floatParams[i]);
}
}
else if (nativeType == GL_INT_64_ANGLEX)
{
std::vector<GLint64> int64Params(numParams, 0);
context->getInteger64v(pname, int64Params.data());
for (unsigned int i = 0; i < numParams; ++i)
{
outParams[i] = CastStateValue<QueryT>(pname, int64Params[i]);
}
}
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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