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//
// Copyright (c) 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/InfoSink.h"
#include "compiler/translator/ParseContext.h"
#include "compiler/translator/depgraph/DependencyGraphOutput.h"
#include "compiler/translator/timing/RestrictFragmentShaderTiming.h"
RestrictFragmentShaderTiming::RestrictFragmentShaderTiming(TInfoSinkBase& sink)
: mSink(sink)
, mNumErrors(0)
{
// Sampling ops found only in fragment shaders.
mSamplingOps.insert("texture2D(s21;vf2;f1;");
mSamplingOps.insert("texture2DProj(s21;vf3;f1;");
mSamplingOps.insert("texture2DProj(s21;vf4;f1;");
mSamplingOps.insert("textureCube(sC1;vf3;f1;");
// Sampling ops found in both vertex and fragment shaders.
mSamplingOps.insert("texture2D(s21;vf2;");
mSamplingOps.insert("texture2DProj(s21;vf3;");
mSamplingOps.insert("texture2DProj(s21;vf4;");
mSamplingOps.insert("textureCube(sC1;vf3;");
// Sampling ops provided by OES_EGL_image_external.
mSamplingOps.insert("texture2D(1;vf2;");
mSamplingOps.insert("texture2DProj(1;vf3;");
mSamplingOps.insert("texture2DProj(1;vf4;");
// Sampling ops provided by ARB_texture_rectangle.
mSamplingOps.insert("texture2DRect(1;vf2;");
mSamplingOps.insert("texture2DRectProj(1;vf3;");
mSamplingOps.insert("texture2DRectProj(1;vf4;");
// Sampling ops provided by EXT_shader_texture_lod.
mSamplingOps.insert("texture2DLodEXT(1;vf2;f1;");
mSamplingOps.insert("texture2DProjLodEXT(1;vf3;f1;");
mSamplingOps.insert("texture2DProjLodEXT(1;vf4;f1;");
mSamplingOps.insert("textureCubeLodEXT(1;vf4;f1;");
mSamplingOps.insert("texture2DGradEXT(1;vf2;vf2;vf2;");
mSamplingOps.insert("texture2DProjGradEXT(1;vf3;vf2;vf2;");
mSamplingOps.insert("texture2DProjGradEXT(1;vf4;vf2;vf2;");
mSamplingOps.insert("textureCubeGradEXT(1;vf3;vf3;vf3;");
}
// FIXME(mvujovic): We do not know if the execution time of built-in operations like sin, pow, etc.
// can vary based on the value of the input arguments. If so, we should restrict those as well.
void RestrictFragmentShaderTiming::enforceRestrictions(const TDependencyGraph& graph)
{
mNumErrors = 0;
// FIXME(mvujovic): The dependency graph does not support user defined function calls right now,
// so we generate errors for them.
validateUserDefinedFunctionCallUsage(graph);
// Starting from each sampler, traverse the dependency graph and generate an error each time we
// hit a node where sampler dependent values are not allowed.
for (auto samplerSymbol : graph.samplerSymbols())
{
clearVisited();
samplerSymbol->traverse(this);
}
}
void RestrictFragmentShaderTiming::validateUserDefinedFunctionCallUsage(const TDependencyGraph& graph)
{
for (const auto* functionCall : graph.userDefinedFunctionCalls())
{
beginError(functionCall->getIntermFunctionCall());
mSink << "A call to a user defined function is not permitted.\n";
}
}
void RestrictFragmentShaderTiming::beginError(const TIntermNode* node)
{
++mNumErrors;
mSink.prefix(EPrefixError);
mSink.location(node->getLine());
}
bool RestrictFragmentShaderTiming::isSamplingOp(const TIntermAggregate* intermFunctionCall) const
{
return !intermFunctionCall->isUserDefined() &&
mSamplingOps.find(intermFunctionCall->getName()) != mSamplingOps.end();
}
void RestrictFragmentShaderTiming::visitArgument(TGraphArgument* parameter)
{
// Texture cache access time might leak sensitive information.
// Thus, we restrict sampler dependent values from affecting the coordinate or LOD bias of a
// sampling operation.
if (isSamplingOp(parameter->getIntermFunctionCall())) {
switch (parameter->getArgumentNumber()) {
case 1:
// Second argument (coord)
beginError(parameter->getIntermFunctionCall());
mSink << "An expression dependent on a sampler is not permitted to be the"
<< " coordinate argument of a sampling operation.\n";
break;
case 2:
// Third argument (bias)
beginError(parameter->getIntermFunctionCall());
mSink << "An expression dependent on a sampler is not permitted to be the"
<< " bias argument of a sampling operation.\n";
break;
default:
// First argument (sampler)
break;
}
}
}
void RestrictFragmentShaderTiming::visitSelection(TGraphSelection* selection)
{
beginError(selection->getIntermSelection());
mSink << "An expression dependent on a sampler is not permitted in a conditional statement.\n";
}
void RestrictFragmentShaderTiming::visitLoop(TGraphLoop* loop)
{
beginError(loop->getIntermLoop());
mSink << "An expression dependent on a sampler is not permitted in a loop condition.\n";
}
void RestrictFragmentShaderTiming::visitLogicalOp(TGraphLogicalOp* logicalOp)
{
beginError(logicalOp->getIntermLogicalOp());
mSink << "An expression dependent on a sampler is not permitted on the left hand side of a logical "
<< logicalOp->getOpString()
<< " operator.\n";
}
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