151 lines
4.5 KiB
C++
151 lines
4.5 KiB
C++
#include "GLSLExtension.hpp"
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#include <iostream>
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#include <sstream>
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#include <stdexcept>
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#include <utility>
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#include "files/engine_paths.hpp"
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#include "files/files.hpp"
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#include "typedefs.hpp"
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#include "util/stringutil.hpp"
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namespace fs = std::filesystem;
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void GLSLExtension::setVersion(std::string version) {
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this->version = std::move(version);
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}
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void GLSLExtension::setPaths(const ResPaths* paths) {
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this->paths = paths;
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}
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void GLSLExtension::loadHeader(const std::string& name) {
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fs::path file = paths->find("shaders/lib/" + name + ".glsl");
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std::string source = files::read_string(file);
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addHeader(name, "");
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addHeader(name, process(file, source, true));
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}
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void GLSLExtension::addHeader(const std::string& name, std::string source) {
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headers[name] = std::move(source);
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}
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void GLSLExtension::define(const std::string& name, std::string value) {
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defines[name] = std::move(value);
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}
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const std::string& GLSLExtension::getHeader(const std::string& name) const {
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auto found = headers.find(name);
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if (found == headers.end()) {
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throw std::runtime_error("no header '" + name + "' loaded");
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}
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return found->second;
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}
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const std::string& GLSLExtension::getDefine(const std::string& name) const {
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auto found = defines.find(name);
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if (found == defines.end()) {
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throw std::runtime_error("name '" + name + "' is not defined");
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}
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return found->second;
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}
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bool GLSLExtension::hasDefine(const std::string& name) const {
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return defines.find(name) != defines.end();
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}
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bool GLSLExtension::hasHeader(const std::string& name) const {
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return headers.find(name) != headers.end();
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}
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void GLSLExtension::undefine(const std::string& name) {
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if (hasDefine(name)) {
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defines.erase(name);
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}
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}
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inline std::runtime_error parsing_error(
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const fs::path& file, uint linenum, const std::string& message
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) {
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return std::runtime_error(
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"file " + file.string() + ": " + message + " at line " +
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std::to_string(linenum)
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);
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}
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inline void parsing_warning(
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const fs::path& file, uint linenum, const std::string& message
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) {
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std::cerr << "file " + file.string() + ": warning: " + message +
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" at line " + std::to_string(linenum)
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<< std::endl;
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}
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inline void source_line(std::stringstream& ss, uint linenum) {
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ss << "#line " << linenum << "\n";
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}
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std::string GLSLExtension::process(
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const fs::path& file, const std::string& source, bool header
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) {
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std::stringstream ss;
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size_t pos = 0;
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uint linenum = 1;
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if (!header) {
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ss << "#version " << version << '\n';
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}
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for (auto& entry : defines) {
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ss << "#define " << entry.first << " " << entry.second << '\n';
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}
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source_line(ss, linenum);
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while (pos < source.length()) {
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size_t endline = source.find('\n', pos);
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if (endline == std::string::npos) {
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endline = source.length();
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}
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// parsing preprocessor directives
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if (source[pos] == '#') {
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std::string line = source.substr(pos + 1, endline - pos);
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util::trim(line);
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// parsing 'include' directive
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if (line.find("include") != std::string::npos) {
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line = line.substr(7);
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util::trim(line);
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if (line.length() < 3) {
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throw parsing_error(
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file, linenum, "invalid 'include' syntax"
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);
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}
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if (line[0] != '<' || line[line.length() - 1] != '>') {
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throw parsing_error(
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file, linenum, "expected '#include <filename>' syntax"
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);
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}
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std::string name = line.substr(1, line.length() - 2);
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if (!hasHeader(name)) {
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loadHeader(name);
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}
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source_line(ss, 1);
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ss << getHeader(name) << '\n';
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pos = endline + 1;
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linenum++;
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source_line(ss, linenum);
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continue;
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}
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// removing extra 'include' directives
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else if (line.find("version") != std::string::npos) {
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parsing_warning(file, linenum, "removed #version directive");
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pos = endline + 1;
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linenum++;
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source_line(ss, linenum);
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continue;
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}
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}
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linenum++;
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ss << source.substr(pos, endline + 1 - pos);
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pos = endline + 1;
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}
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return ss.str();
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}
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