VersionGLSL.cpp

Branch :

Show log
Commit
Author : Stuart Morgan
Date : 2019-08-14 12:25:12
Hash : 9d737966
Message : Standardize copyright notices to project style For all "ANGLE Project" copyrights, standardize to the format specified by the style guide. Changes: - "Copyright (c)" and "Copyright(c)" changed to just "Copyright". - Removed the second half of date ranges ("Y1Y1-Y2Y2"->"Y1Y1"). - Fixed a small number of files that had no copyright date using the initial commit year from the version control history. - Fixed one instance of copyright being "The ANGLE Project" rather than "The ANGLE Project Authors" These changes are applied both to the copyright of source file, and where applicable to copyright statements that are generated by templates. BUG=angleproject:3811 Change-Id: I973dd65e4ef9deeba232d5be74c768256a0eb2e5 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1754397 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>

src/compiler/translator/VersionGLSL.cpp

//
// Copyright 2002 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/VersionGLSL.h"

#include "angle_gl.h"
#include "compiler/translator/Symbol.h"

namespace sh
{

namespace
{
constexpr const ImmutableString kGlPointCoordString("gl_PointCoord");
}  // anonymous namespace

int ShaderOutputTypeToGLSLVersion(ShShaderOutput output)
{
    switch (output)
    {
        case SH_GLSL_130_OUTPUT:
            return GLSL_VERSION_130;
        case SH_GLSL_140_OUTPUT:
            return GLSL_VERSION_140;
        case SH_GLSL_150_CORE_OUTPUT:
            return GLSL_VERSION_150;
        case SH_GLSL_330_CORE_OUTPUT:
            return GLSL_VERSION_330;
        case SH_GLSL_400_CORE_OUTPUT:
            return GLSL_VERSION_400;
        case SH_GLSL_410_CORE_OUTPUT:
            return GLSL_VERSION_410;
        case SH_GLSL_420_CORE_OUTPUT:
            return GLSL_VERSION_420;
        case SH_GLSL_430_CORE_OUTPUT:
            return GLSL_VERSION_430;
        case SH_GLSL_440_CORE_OUTPUT:
            return GLSL_VERSION_440;
        case SH_GLSL_450_CORE_OUTPUT:
            return GLSL_VERSION_450;
        case SH_GLSL_COMPATIBILITY_OUTPUT:
            return GLSL_VERSION_110;
        default:
            UNREACHABLE();
            return 0;
    }
}

// We need to scan for the following:
// 1. "invariant" keyword: This can occur in both - vertex and fragment shaders
//    but only at the global scope.
// 2. "gl_PointCoord" built-in variable: This can only occur in fragment shader
//    but inside any scope.
// 3. Call to a matrix constructor with another matrix as argument.
//    (These constructors were reserved in GLSL version 1.10.)
// 4. Arrays as "out" function parameters.
//    GLSL spec section 6.1.1: "When calling a function, expressions that do
//    not evaluate to l-values cannot be passed to parameters declared as
//    out or inout."
//    GLSL 1.1 section 5.8: "Other binary or unary expressions,
//    non-dereferenced arrays, function names, swizzles with repeated fields,
//    and constants cannot be l-values."
//    GLSL 1.2 relaxed the restriction on arrays, section 5.8: "Variables that
//    are built-in types, entire structures or arrays... are all l-values."
//
TVersionGLSL::TVersionGLSL(sh::GLenum type, const TPragma &pragma, ShShaderOutput output)
    : TIntermTraverser(true, false, false)
{
    mVersion = ShaderOutputTypeToGLSLVersion(output);
    if (pragma.stdgl.invariantAll)
    {
        ensureVersionIsAtLeast(GLSL_VERSION_120);
    }
    if (type == GL_COMPUTE_SHADER)
    {
        ensureVersionIsAtLeast(GLSL_VERSION_430);
    }
}

void TVersionGLSL::visitSymbol(TIntermSymbol *node)
{
    if (node->variable().symbolType() == SymbolType::BuiltIn &&
        node->getName() == kGlPointCoordString)
    {
        ensureVersionIsAtLeast(GLSL_VERSION_120);
    }
}

bool TVersionGLSL::visitDeclaration(Visit, TIntermDeclaration *node)
{
    const TIntermSequence &sequence = *(node->getSequence());
    if (sequence.front()->getAsTyped()->getType().isInvariant())
    {
        ensureVersionIsAtLeast(GLSL_VERSION_120);
    }
    return true;
}

bool TVersionGLSL::visitInvariantDeclaration(Visit, TIntermInvariantDeclaration *node)
{
    ensureVersionIsAtLeast(GLSL_VERSION_120);
    return true;
}

void TVersionGLSL::visitFunctionPrototype(TIntermFunctionPrototype *node)
{
    size_t paramCount = node->getFunction()->getParamCount();
    for (size_t i = 0; i < paramCount; ++i)
    {
        const TVariable *param = node->getFunction()->getParam(i);
        const TType &type      = param->getType();
        if (type.isArray())
        {
            TQualifier qualifier = type.getQualifier();
            if ((qualifier == EvqOut) || (qualifier == EvqInOut))
            {
                ensureVersionIsAtLeast(GLSL_VERSION_120);
                break;
            }
        }
    }
}

bool TVersionGLSL::visitAggregate(Visit, TIntermAggregate *node)
{
    if (node->getOp() == EOpConstruct && node->getType().isMatrix())
    {
        const TIntermSequence &sequence = *(node->getSequence());
        if (sequence.size() == 1)
        {
            TIntermTyped *typed = sequence.front()->getAsTyped();
            if (typed && typed->isMatrix())
            {
                ensureVersionIsAtLeast(GLSL_VERSION_120);
            }
        }
    }
    return true;
}

void TVersionGLSL::ensureVersionIsAtLeast(int version)
{
    mVersion = std::max(version, mVersion);
}

}  // namespace sh

kc3-lang/angle/src/compiler/translator/VersionGLSL.cpp

Commit

kc3-lang/angle /src/compiler/translator/VersionGLSL.cpp