framework/randomshaders/rsgUtils.hpp

#ifndef _RSGUTILS_HPP
#define _RSGUTILS_HPP
/*-------------------------------------------------------------------------
 * drawElements Quality Program Random Shader Generator
 * ----------------------------------------------------
 *
 * Copyright 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 *//*!
 * \file
 * \brief Utilities.
 *//*--------------------------------------------------------------------*/

#include "rsgDefs.hpp"
#include "rsgShader.hpp"
#include "rsgVariableValue.hpp"
#include "deRandom.hpp"
#include "rsgGeneratorState.hpp"
#include "deMath.h"

#include <vector>

namespace rsg
{

void		computeUnifiedUniforms		(const Shader& vertexShader, const Shader& fragmentShader, std::vector<const ShaderInput*>& uniforms);
void		computeUniformValues		(de::Random& rnd, std::vector<VariableValue>& values, const std::vector<const ShaderInput*>& uniforms);

// \todo [2011-03-26 pyry] Move to ExpressionUtils!

bool			isUndefinedValueRange			(ConstValueRangeAccess valueRange);

int				getConservativeValueExprDepth	(const GeneratorState& state, ConstValueRangeAccess valueRange);
int				getTypeConstructorDepth			(const VariableType& type);

VariableType	computeRandomType				(GeneratorState& state, int maxScalars);
void			computeRandomValueRange			(GeneratorState& state, ValueRangeAccess valueRange);

float			computeDynamicRangeWeight		(ConstValueRangeAccess valueRange);

inline float getQuantizedFloat (de::Random& rnd, float min, float max, float step)
{
	int numSteps = (int)((max-min)/step);
	return min + step * (float)rnd.getInt(0, numSteps);
}

inline bool quantizeFloatRange (float& min, float& max)
{
	const float	subdiv = 8;

	float newMin = deFloatCeil(min*subdiv)/subdiv;
	if (newMin <= max)
		min = newMin; // Minimum value quantized
	else
		return false;

	float newMax = deFloatFloor(max*subdiv)/subdiv;
	if (min <= newMax)
		max = newMax;
	else
		return false;

	return true;
}

} // rsg

#endif // _RSGUTILS_HPP