mirror of
https://github.com/Blinue/Magpie.git
synced 2026-06-24 02:04:10 +00:00
528 lines
10 KiB
C++
528 lines
10 KiB
C++
#include "pch.h"
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#include "EffectCompiler.h"
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UINT EffectCompiler::Compile(const wchar_t* fileName, EffectDesc& desc) {
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desc = {};
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std::string source;
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Utils::ReadTextFile(fileName, source);
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if (source.empty()) {
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return 1;
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}
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// 移除注释
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if (_RemoveComments(source)) {
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return 1;
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}
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std::string_view sourceView(source);
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// 检查头
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if (!_CheckMagic(sourceView)) {
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return 2;
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}
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enum class BlockType {
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Header,
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Constant,
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Texture,
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Sampler,
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Common,
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Pass
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};
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std::string_view headerBlock;
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std::vector<std::string_view> constantBlocks;
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std::vector<std::string_view> textureBlocks;
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std::vector<std::string_view> samplerBlocks;
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std::vector<std::string_view> commonBlocks;
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std::vector<std::string_view> passBlocks;
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BlockType curBlockType = BlockType::Header;
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size_t curBlockOff = 0;
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auto completeCurrentBlock = [&](size_t len, BlockType newBlockType) {
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switch (curBlockType) {
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case BlockType::Header:
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headerBlock = sourceView.substr(curBlockOff, len);
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break;
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case BlockType::Constant:
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constantBlocks.push_back(sourceView.substr(curBlockOff, len));
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break;
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case BlockType::Texture:
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textureBlocks.push_back(sourceView.substr(curBlockOff, len));
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break;
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case BlockType::Sampler:
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samplerBlocks.push_back(sourceView.substr(curBlockOff, len));
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break;
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case BlockType::Common:
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commonBlocks.push_back(sourceView.substr(curBlockOff, len));
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break;
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case BlockType::Pass:
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passBlocks.push_back(sourceView.substr(curBlockOff, len));
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break;
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default:
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assert(false);
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break;
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}
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curBlockType = newBlockType;
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curBlockOff += len;
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};
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bool newLine = true;
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std::string_view t = sourceView;
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while (t.size() > 5) {
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if (newLine) {
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// 包含换行符
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size_t len = t.data() - sourceView.data() - curBlockOff + 1;
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if (_CheckNextToken<true>(t, _META_INDICATOR)) {
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std::string_view token;
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if (_GetNextToken<false>(t, token)) {
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return 1;
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}
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std::string blockType = Utils::ToUpperCase(token);
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if (blockType == "CONSTANT") {
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completeCurrentBlock(len, BlockType::Constant);
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} else if (blockType == "TEXTURE") {
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completeCurrentBlock(len, BlockType::Texture);
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} else if (blockType == "SAMPLER") {
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completeCurrentBlock(len, BlockType::Sampler);
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} else if (blockType == "COMMON") {
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completeCurrentBlock(len, BlockType::Common);
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} else if (blockType == "PASS") {
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completeCurrentBlock(len, BlockType::Pass);
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}
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}
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if (t.size() <= 5) {
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break;
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}
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} else {
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t.remove_prefix(1);
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}
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newLine = t[0] == '\n';
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}
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completeCurrentBlock(sourceView.size() - curBlockOff, BlockType::Header);
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if (_ResolveHeader(headerBlock, desc)) {
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return 1;
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}
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for (std::string_view& block : constantBlocks) {
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if (_ResolveConstants(block, desc)) {
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return 1;
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}
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}
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return 0;
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}
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UINT EffectCompiler::_RemoveComments(std::string& source) {
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// 确保以换行符结尾
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if (source.back() != '\n') {
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source.push_back('\n');
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}
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std::string result;
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result.reserve(source.size());
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int j = 0;
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// 单独处理最后两个字符
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for (size_t i = 0, end = source.size() - 2; i < end; ++i) {
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if (source[i] == '/') {
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if (source[i + 1] == '/' && source[i + 2] != '!') {
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// 行注释
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i += 2;
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// 无需处理越界，因为必定以换行符结尾
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while (source[i] != '\n') {
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++i;
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}
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// 文件结尾
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if (i >= source.size() - 2) {
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source.resize(j);
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return 0;
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}
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continue;
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} else if (source[i + 1] == '*') {
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// 块注释
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i += 2;
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while(true) {
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if (++i >= source.size()) {
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// 未闭合
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return 1;
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}
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if (source[i - 1] == '*' && source[i] == '/') {
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break;
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}
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}
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// 文件结尾
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if (i >= source.size() - 2) {
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source.resize(j);
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return 0;
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}
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continue;
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}
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}
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source[j++] = source[i];
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}
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// 无需复制最后的换行符
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source[j++] = source[source.size() - 2];
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source.resize(j);
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return 0;
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}
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UINT EffectCompiler::_GetNextExpr(std::string_view& source, std::string& expr) {
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_RemoveLeadingBlanks<false>(source);
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size_t size = std::min(source.find('\n') + 1, source.size());
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// 移除空白字符
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expr.resize(size);
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size_t j = 0;
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for (size_t i = 0; i < size; ++i) {
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char c = source[i];
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if (!isspace(c)) {
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expr[j++] = c;
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}
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}
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expr.resize(j);
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if (expr.empty()) {
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return 1;
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}
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source.remove_prefix(size);
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return 0;
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}
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UINT EffectCompiler::_GetNextString(std::string_view& source, std::string_view& value) {
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_RemoveLeadingBlanks<false>(source);
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size_t pos = source.find('\n');
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value = source.substr(0, pos);
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Utils::Trim(value);
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if (value.empty()) {
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return 1;
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}
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source.remove_prefix(std::min(pos + 1, source.size()));
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return 0;
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}
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bool EffectCompiler::_CheckMagic(std::string_view& source) {
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std::string_view token;
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if (!_CheckNextToken<true>(source, _META_INDICATOR)) {
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return false;
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}
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if (!_CheckNextToken<false>(source, "MAGPIE")) {
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return false;
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}
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if (!_CheckNextToken<false>(source, "EFFECT")) {
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return false;
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}
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if (_GetNextToken<false>(source, token) != 2) {
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return false;
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}
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if (source.empty()) {
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return false;
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}
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return true;
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}
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UINT EffectCompiler::_ResolveHeader(std::string_view block, EffectDesc& desc) {
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// 必需的选项：VERSION
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// 可选的选项：OUTPUT_WIDTH，OUTPUT_HEIGHT
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std::vector<bool> processed(3, false);
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std::string_view token;
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while (true) {
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if (!_CheckNextToken<true>(block, _META_INDICATOR)) {
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break;
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}
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if (_GetNextToken<false>(block, token)) {
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return 1;
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}
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std::string t = Utils::ToUpperCase(token);
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if (t == "VERSION") {
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if (processed[0]) {
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return 1;
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}
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processed[0] = true;
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UINT version;
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if (_GetNextNumber(block, version)) {
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return 1;
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}
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if (version != 1) {
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return 1;
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}
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desc.version = version;
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if (_GetNextToken<false>(block, token) != 2) {
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return 1;
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}
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} else if (t == "OUTPUT_WIDTH") {
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if (processed[1]) {
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return 1;
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}
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processed[1] = true;
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if (_GetNextExpr(block, desc.outSizeExpr.first)) {
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return 1;
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}
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} else if (t == "OUTPUT_HEIGHT") {
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if (processed[2]) {
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return 1;
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}
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processed[2] = true;
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if (_GetNextExpr(block, desc.outSizeExpr.second)) {
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return 1;
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}
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} else {
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return 1;
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}
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}
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// HEADER 块不含代码部分
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if (_GetNextToken<true>(block, token) != 2) {
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return 1;
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}
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if (!processed[0] || (processed[1] ^ processed[2])) {
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return 1;
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}
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return 0;
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}
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UINT EffectCompiler::_ResolveConstants(std::string_view block, EffectDesc& desc) {
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// 可选的选项：VALUE，DEFAULT，LABEL，MIN，MAX
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// VALUE 与其他选项互斥
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std::vector<bool> processed(5, false);
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std::string_view token;
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if (!_CheckNextToken<true>(block, _META_INDICATOR)) {
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return 1;
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}
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if (!_CheckNextToken<false>(block, "CONSTANT")) {
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return 1;
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}
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if (_GetNextToken<false>(block, token) != 2) {
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return 1;
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}
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EffectConstantDesc desc1{};
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EffectValueConstantDesc desc2{};
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std::string_view defaultValue;
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std::string_view minValue;
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std::string_view maxValue;
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while (true) {
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if (!_CheckNextToken<true>(block, _META_INDICATOR)) {
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break;
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}
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if (_GetNextToken<false>(block, token)) {
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return 1;
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}
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std::string t = Utils::ToUpperCase(token);
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if (t == "VALUE") {
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for (int i = 0; i < 5; ++i) {
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if (processed[i]) {
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return 1;
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}
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}
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processed[0] = true;
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if (_GetNextExpr(block, desc2.valueExpr)) {
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return 1;
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}
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} else if (t == "DEFAULT") {
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if (processed[0] || processed[1]) {
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return 1;
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}
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processed[1] = true;
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if (_GetNextString(block, defaultValue)) {
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return 1;
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}
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} else if (t == "LABEL") {
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if (processed[0] || processed[2]) {
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return 1;
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}
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processed[2] = true;
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std::string_view t;
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if (_GetNextString(block, t)) {
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return 1;
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}
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desc1.label = t;
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} else if (t == "MIN") {
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if (processed[0] || processed[3]) {
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return 1;
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}
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processed[3] = true;
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if (_GetNextString(block, minValue)) {
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return 1;
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}
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} else if (t == "MAX") {
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if (processed[0] || processed[4]) {
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return 1;
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}
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processed[4] = true;
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if (_GetNextString(block, maxValue)) {
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return 1;
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}
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} else {
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return 1;
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}
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}
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// 代码部分
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if (_GetNextToken<true>(block, token)) {
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return 1;
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}
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if (token == "float") {
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if (processed[0]) {
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desc2.type = EffectConstantType::Float;
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} else {
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desc1.type = EffectConstantType::Float;
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if (!defaultValue.empty()) {
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desc1.defaultValue = 0.0f;
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if (_GetNextNumber(defaultValue, std::get<float>(desc1.defaultValue))) {
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return 1;
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}
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}
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if (!minValue.empty()) {
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float value;
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if (_GetNextNumber(minValue, value)) {
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return 1;
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}
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if (!defaultValue.empty() && std::get<float>(desc1.defaultValue) < value) {
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return 1;
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}
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desc1.minValue = value;
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}
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if (!maxValue.empty()) {
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float value;
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if (_GetNextNumber(maxValue, value)) {
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return 1;
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}
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if (!defaultValue.empty() && std::get<float>(desc1.defaultValue) > value) {
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return 1;
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}
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if (!minValue.empty() && std::get<float>(desc1.minValue) > value) {
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return 1;
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}
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desc1.maxValue = value;
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}
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}
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} else if (token == "int") {
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if (processed[0]) {
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desc2.type = EffectConstantType::Int;
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} else {
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desc1.type = EffectConstantType::Int;
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if (!defaultValue.empty()) {
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desc1.defaultValue = 0;
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if (_GetNextNumber(defaultValue, std::get<int>(desc1.defaultValue))) {
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return 1;
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}
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}
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if (!minValue.empty()) {
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int value;
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if (_GetNextNumber(minValue, value)) {
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return 1;
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}
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if (!defaultValue.empty() && std::get<int>(desc1.defaultValue) < value) {
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return 1;
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}
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desc1.minValue = value;
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}
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if (!maxValue.empty()) {
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int value;
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if (_GetNextNumber(maxValue, value)) {
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return 1;
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}
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if (!defaultValue.empty() && std::get<int>(desc1.defaultValue) > value) {
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return 1;
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}
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if (!minValue.empty() && std::get<int>(desc1.minValue) > value) {
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return 1;
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}
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desc1.maxValue = value;
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}
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}
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} else {
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return 1;
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}
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if (_GetNextToken<true>(block, token)) {
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return 1;
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}
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(processed[0] ? desc2.name : desc1.name) = token;
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if (!_CheckNextToken<true>(block, ";")) {
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return 1;
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}
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if (_GetNextToken<true>(block, token) != 2) {
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return 1;
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}
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if (processed[0]) {
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desc.valueConstants.emplace_back(std::move(desc2));
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} else {
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desc.constants.emplace_back(std::move(desc1));
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}
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return 0;
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}
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