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Diffstat (limited to 'src/shadertools/qshaderbatchablerewriter.cpp')
| -rw-r--r-- | src/shadertools/qshaderbatchablerewriter.cpp | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/src/shadertools/qshaderbatchablerewriter.cpp b/src/shadertools/qshaderbatchablerewriter.cpp new file mode 100644 index 0000000..72b369f --- /dev/null +++ b/src/shadertools/qshaderbatchablerewriter.cpp @@ -0,0 +1,223 @@ +/**************************************************************************** +** +** Copyright (C) 2017 The Qt Company Ltd. +** Contact: http://www.qt.io/licensing/ +** +** This file is part of the Qt Shader Tools module +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qshaderbatchablerewriter_p.h" + +// This is a slightly modified version of qsgshaderrewriter.cpp from +// qtdeclarative/src/quick/scenegraph/coreapi. Here we insert an extra vertex +// attribute (_qt_order) at location 7. + +QT_BEGIN_NAMESPACE + +namespace QShaderBatchableRewriter { + +struct Tokenizer { + + enum Token { + Token_Void, + Token_OpenBrace, + Token_CloseBrace, + Token_SemiColon, + Token_Identifier, + Token_Macro, + Token_Unspecified, + + Token_EOF + }; + + static const char *NAMES[]; + + void initialize(const QByteArray &input); + Token next(); + + const char *stream; + const char *pos; + const char *identifier; +}; + +const char *Tokenizer::NAMES[] = { + "Void", + "OpenBrace", + "CloseBrace", + "SemiColon", + "Identifier", + "Macro", + "Unspecified", + "EOF" +}; + +void Tokenizer::initialize(const QByteArray &input) +{ + stream = input.constData(); + pos = input; + identifier = input; +} + +Tokenizer::Token Tokenizer::next() +{ + while (*pos != 0) { + char c = *pos++; + switch (c) { + case '/': + + if (*pos == '/') { + // '//' comment + ++pos; + while (*pos != 0 && *pos != '\n') ++pos; + if (*pos != 0) ++pos; // skip the newline + + } else if (*pos == '*') { + // /* */ comment + ++pos; + while (*pos != 0 && *pos != '*' && pos[1] != '/') ++pos; + if (*pos != 0) pos += 2; + } + break; + + case '#': { + while (*pos != 0) { + if (*pos == '\n') { + ++pos; + break; + } else if (*pos == '\\') { + ++pos; + while (*pos != 0 && (*pos == ' ' || *pos == '\t')) + ++pos; + if (*pos != 0 && (*pos == '\n' || (*pos == '\r' && pos[1] == '\n'))) + pos+=2; + } else { + ++pos; + } + } + break; + } + + case 'v': { + if (*pos == 'o' && pos[1] == 'i' && pos[2] == 'd') { + pos += 3; + return Token_Void; + } + Q_FALLTHROUGH(); + } + + case ';': return Token_SemiColon; + case 0: return Token_EOF; + case '{': return Token_OpenBrace; + case '}': return Token_CloseBrace; + + case ' ': + case '\n': + case '\r': break; + default: + // Identifier... + if ((c >= 'a' && c <= 'z' ) || (c >= 'A' && c <= 'Z' ) || c == '_') { + identifier = pos - 1; + while (*pos != 0 && ((*pos >= 'a' && *pos <= 'z') + || (*pos >= 'A' && *pos <= 'Z') + || *pos == '_' + || (*pos >= '0' && *pos <= '9'))) { + ++pos; + } + return Token_Identifier; + } else { + return Token_Unspecified; + } + } + } + + return Token_EOF; +} + +QByteArray addZAdjustment(const QByteArray &input) +{ + Tokenizer tok; + tok.initialize(input); + + Tokenizer::Token lt = tok.next(); + Tokenizer::Token t = tok.next(); + + // First find "void main() { ... " + const char* voidPos = input.constData(); + while (t != Tokenizer::Token_EOF) { + if (lt == Tokenizer::Token_Void && t == Tokenizer::Token_Identifier) { + if (qstrncmp("main", tok.identifier, 4) == 0) + break; + } + voidPos = tok.pos - 4; + lt = t; + t = tok.next(); + } + + QByteArray result; + result.reserve(1024); + result += QByteArray::fromRawData(input.constData(), voidPos - input.constData()); + + result += QByteArrayLiteral("layout(location = 7) in float _qt_order;\n"); + + // Find first brace '{' + while (t != Tokenizer::Token_EOF && t != Tokenizer::Token_OpenBrace) t = tok.next(); + int braceDepth = 1; + t = tok.next(); + + // Find matching brace and insert our code there... + while (t != Tokenizer::Token_EOF) { + switch (t) { + case Tokenizer::Token_CloseBrace: + braceDepth--; + if (braceDepth == 0) { + result += QByteArray::fromRawData(voidPos, tok.pos - 1 - voidPos); + result += QByteArrayLiteral(" gl_Position.z = _qt_order * gl_Position.w;\n"); + result += QByteArray(tok.pos - 1); + return result; + } + break; + case Tokenizer::Token_OpenBrace: + ++braceDepth; + break; + default: + break; + } + t = tok.next(); + } + return QByteArray(); +} + +} // namespace + +QT_END_NAMESPACE |