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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.
//
#include "compiler/translator/VariablePacker.h"
#include "angle_gl.h"
#include "common/utilities.h"
#include <algorithm>
int VariablePacker::GetNumComponentsPerRow(sh::GLenum type)
{
switch (type)
{
case GL_FLOAT_MAT4:
case GL_FLOAT_MAT2:
case GL_FLOAT_MAT2x4:
case GL_FLOAT_MAT3x4:
case GL_FLOAT_MAT4x2:
case GL_FLOAT_MAT4x3:
case GL_FLOAT_VEC4:
case GL_INT_VEC4:
case GL_BOOL_VEC4:
case GL_UNSIGNED_INT_VEC4:
return 4;
case GL_FLOAT_MAT3:
case GL_FLOAT_MAT2x3:
case GL_FLOAT_MAT3x2:
case GL_FLOAT_VEC3:
case GL_INT_VEC3:
case GL_BOOL_VEC3:
case GL_UNSIGNED_INT_VEC3:
return 3;
case GL_FLOAT_VEC2:
case GL_INT_VEC2:
case GL_BOOL_VEC2:
case GL_UNSIGNED_INT_VEC2:
return 2;
default:
ASSERT(gl::VariableComponentCount(type) == 1);
return 1;
}
}
int VariablePacker::GetNumRows(sh::GLenum type)
{
switch (type)
{
case GL_FLOAT_MAT4:
case GL_FLOAT_MAT2x4:
case GL_FLOAT_MAT3x4:
case GL_FLOAT_MAT4x3:
case GL_FLOAT_MAT4x2:
return 4;
case GL_FLOAT_MAT3:
case GL_FLOAT_MAT2x3:
case GL_FLOAT_MAT3x2:
return 3;
case GL_FLOAT_MAT2:
return 2;
default:
ASSERT(gl::VariableRowCount(type) == 1);
return 1;
}
}
struct TVariableInfoComparer
{
bool operator()(const sh::ShaderVariable &lhs, const sh::ShaderVariable &rhs) const
{
int lhsSortOrder = gl::VariableSortOrder(lhs.type);
int rhsSortOrder = gl::VariableSortOrder(rhs.type);
if (lhsSortOrder != rhsSortOrder) {
return lhsSortOrder < rhsSortOrder;
}
// Sort by largest first.
return lhs.arraySize > rhs.arraySize;
}
};
unsigned VariablePacker::makeColumnFlags(int column, int numComponentsPerRow)
{
return ((kColumnMask << (kNumColumns - numComponentsPerRow)) &
kColumnMask) >> column;
}
void VariablePacker::fillColumns(int topRow, int numRows, int column, int numComponentsPerRow)
{
unsigned columnFlags = makeColumnFlags(column, numComponentsPerRow);
for (int r = 0; r < numRows; ++r) {
int row = topRow + r;
ASSERT((rows_[row] & columnFlags) == 0);
rows_[row] |= columnFlags;
}
}
bool VariablePacker::searchColumn(int column, int numRows, int* destRow, int* destSize)
{
ASSERT(destRow);
for (; topNonFullRow_ < maxRows_ && rows_[topNonFullRow_] == kColumnMask;
++topNonFullRow_) {
}
for (; bottomNonFullRow_ >= 0 && rows_[bottomNonFullRow_] == kColumnMask;
--bottomNonFullRow_) {
}
if (bottomNonFullRow_ - topNonFullRow_ + 1 < numRows) {
return false;
}
unsigned columnFlags = makeColumnFlags(column, 1);
int topGoodRow = 0;
int smallestGoodTop = -1;
int smallestGoodSize = maxRows_ + 1;
int bottomRow = bottomNonFullRow_ + 1;
bool found = false;
for (int row = topNonFullRow_; row <= bottomRow; ++row) {
bool rowEmpty = row < bottomRow ? ((rows_[row] & columnFlags) == 0) : false;
if (rowEmpty) {
if (!found) {
topGoodRow = row;
found = true;
}
} else {
if (found) {
int size = row - topGoodRow;
if (size >= numRows && size < smallestGoodSize) {
smallestGoodSize = size;
smallestGoodTop = topGoodRow;
}
}
found = false;
}
}
if (smallestGoodTop < 0) {
return false;
}
*destRow = smallestGoodTop;
if (destSize) {
*destSize = smallestGoodSize;
}
return true;
}
template <typename VarT>
bool VariablePacker::CheckVariablesWithinPackingLimits(unsigned int maxVectors,
const std::vector<VarT> &in_variables)
{
ASSERT(maxVectors > 0);
maxRows_ = maxVectors;
topNonFullRow_ = 0;
bottomNonFullRow_ = maxRows_ - 1;
std::vector<VarT> variables(in_variables);
// Check whether each variable fits in the available vectors.
for (size_t i = 0; i < variables.size(); i++) {
const sh::ShaderVariable &variable = variables[i];
if (variable.elementCount() > maxVectors / GetNumRows(variable.type)) {
return false;
}
}
// As per GLSL 1.017 Appendix A, Section 7 variables are packed in specific
// order by type, then by size of array, largest first.
std::sort(variables.begin(), variables.end(), TVariableInfoComparer());
rows_.clear();
rows_.resize(maxVectors, 0);
// Packs the 4 column variables.
size_t ii = 0;
for (; ii < variables.size(); ++ii) {
const sh::ShaderVariable &variable = variables[ii];
if (GetNumComponentsPerRow(variable.type) != 4) {
break;
}
topNonFullRow_ += GetNumRows(variable.type) * variable.elementCount();
}
if (topNonFullRow_ > maxRows_) {
return false;
}
// Packs the 3 column variables.
int num3ColumnRows = 0;
for (; ii < variables.size(); ++ii) {
const sh::ShaderVariable &variable = variables[ii];
if (GetNumComponentsPerRow(variable.type) != 3) {
break;
}
num3ColumnRows += GetNumRows(variable.type) * variable.elementCount();
}
if (topNonFullRow_ + num3ColumnRows > maxRows_) {
return false;
}
fillColumns(topNonFullRow_, num3ColumnRows, 0, 3);
// Packs the 2 column variables.
int top2ColumnRow = topNonFullRow_ + num3ColumnRows;
int twoColumnRowsAvailable = maxRows_ - top2ColumnRow;
int rowsAvailableInColumns01 = twoColumnRowsAvailable;
int rowsAvailableInColumns23 = twoColumnRowsAvailable;
for (; ii < variables.size(); ++ii) {
const sh::ShaderVariable &variable = variables[ii];
if (GetNumComponentsPerRow(variable.type) != 2) {
break;
}
int numRows = GetNumRows(variable.type) * variable.elementCount();
if (numRows <= rowsAvailableInColumns01) {
rowsAvailableInColumns01 -= numRows;
} else if (numRows <= rowsAvailableInColumns23) {
rowsAvailableInColumns23 -= numRows;
} else {
return false;
}
}
int numRowsUsedInColumns01 =
twoColumnRowsAvailable - rowsAvailableInColumns01;
int numRowsUsedInColumns23 =
twoColumnRowsAvailable - rowsAvailableInColumns23;
fillColumns(top2ColumnRow, numRowsUsedInColumns01, 0, 2);
fillColumns(maxRows_ - numRowsUsedInColumns23, numRowsUsedInColumns23,
2, 2);
// Packs the 1 column variables.
for (; ii < variables.size(); ++ii) {
const sh::ShaderVariable &variable = variables[ii];
ASSERT(1 == GetNumComponentsPerRow(variable.type));
int numRows = GetNumRows(variable.type) * variable.elementCount();
int smallestColumn = -1;
int smallestSize = maxRows_ + 1;
int topRow = -1;
for (int column = 0; column < kNumColumns; ++column) {
int row = 0;
int size = 0;
if (searchColumn(column, numRows, &row, &size)) {
if (size < smallestSize) {
smallestSize = size;
smallestColumn = column;
topRow = row;
}
}
}
if (smallestColumn < 0) {
return false;
}
fillColumns(topRow, numRows, smallestColumn, 1);
}
ASSERT(variables.size() == ii);
return true;
}
// Instantiate all possible variable packings
template bool VariablePacker::CheckVariablesWithinPackingLimits(unsigned int, const std::vector<sh::ShaderVariable> &);
template bool VariablePacker::CheckVariablesWithinPackingLimits(unsigned int, const std::vector<sh::Attribute> &);
template bool VariablePacker::CheckVariablesWithinPackingLimits(unsigned int, const std::vector<sh::Uniform> &);
template bool VariablePacker::CheckVariablesWithinPackingLimits(unsigned int, const std::vector<sh::Varying> &);
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