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//
// Copyright (c) 2002-2012 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 COMPILER_TRANSLATOR_VARIABLEPACKER_H_
#define COMPILER_TRANSLATOR_VARIABLEPACKER_H_
#include <vector>
#include "compiler/translator/VariableInfo.h"
class VariablePacker {
public:
// Returns true if the passed in variables pack in maxVectors following
// the packing rules from the GLSL 1.017 spec, Appendix A, section 7.
bool CheckVariablesWithinPackingLimits(unsigned int maxVectors,
const std::vector<sh::ShaderVariable> &in_variables);
// Gets how many components in a row a data type takes.
static int GetNumComponentsPerRow(sh::GLenum type);
// Gets how many rows a data type takes.
static int GetNumRows(sh::GLenum type);
private:
static const int kNumColumns = 4;
static const unsigned kColumnMask = (1 << kNumColumns) - 1;
unsigned makeColumnFlags(int column, int numComponentsPerRow);
void fillColumns(int topRow, int numRows, int column, int numComponentsPerRow);
bool searchColumn(int column, int numRows, int *destRow, int *destSize);
int topNonFullRow_;
int bottomNonFullRow_;
int maxRows_;
std::vector<unsigned> rows_;
};
#endif // COMPILER_TRANSLATOR_VARIABLEPACKER_H_
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