Add pdsg (palladium spirv-generator)

- remove glslang from pd-system
- use spirv blobs instead of glsl 460
- Use Legacy shaders for OpenGL2 backend
- add devnotes

tools/pdsg/source/main.cpp

@@ -0,0 +1,45 @@
+#include <format>
+#include <fstream>
+#include <iostream>
+#include <spirv-helper.hpp>
+#include <sstream>
+
+template <typename... Args>
+void FmtPrint(std::format_string<Args...> fmt, Args&&... args) {
+  std::cout << std::format(fmt, std::forward<Args>(args)...);
+}
+
+std::string LoadFile(const std::string& path) {
+  std::stringstream s;
+  std::ifstream f(path);
+  s << f.rdbuf();
+  return s.str();
+}
+
+int main(int argc, char** argv) {
+  if (argc != 4) return 0;
+  SpirvHelper::Stage mode = SpirvHelper::Stage::Vertex;
+  if (std::string(argv[3]) == "vertex") {
+    mode = SpirvHelper::Stage::Vertex;
+  } else if (std::string(argv[3]) == "fragment") {
+    mode = SpirvHelper::Stage::Fragment;
+  } else if (std::string(argv[3]) == "geometry") {
+    mode = SpirvHelper::Stage::Geometry;
+  }
+  FmtPrint("ProcessingMode: {}\n", (int)mode);
+  FmtPrint("Loading {}\n", argv[1]);
+  std::string shader = LoadFile(argv[1]);
+  FmtPrint("Generating SPIRV...\n");
+  auto res = SpirvHelper::GLSL2SPV(SpirvHelper::Stage::Vertex, shader.c_str());
+  FmtPrint("Result size: {}\n", res.size());
+  std::ofstream ff(argv[2]);
+  FmtPrint("Writing into {}", argv[2]);
+  ff << "#pragma once\n\n#include <cinttypes>\n\n// clang-format off\nconst "
+        "unsigned int pShader[] "
+        "= { ";
+  for (auto& it : res) {
+    ff << std::format("0x{:X}, ", it);
+  }
+  ff << "};\n// clang-format on\n";
+  return 0;
+}