More spirv compile shit

shaders/compile.ps1

@@ -1,4 +1,33 @@
-glslangValidator -V line.frag -o line_frag.spv
-glslangValidator -V line.vert -o line_vert.spv
-glslangValidator -V triangle.frag -o triangle_frag.spv
-glslangValidator -V triangle.vert -o triangle_vert.spv
+$compileHashFile = "compilehashes.xml"
+
+if (Get-ChildItem -File $compileHashFile -ErrorAction SilentlyContinue) {
+    $hashes = Import-Clixml $compileHashFile
+} else {
+    $hashes = @{}
+}
+
+function CompileShader($fileName) {
+    $spvFileName = "$fileName.spv"
+    $newHash = Get-FileHash -Path $fileName -Algorithm SHA1
+
+    $spvExists = $false
+    if (Get-ChildItem -File $spvFileName -ErrorAction SilentlyContinue) {
+        $spvExists = $true
+    }
+    
+    if ($spvExists -and $hashes.ContainsKey($fileName) -and $hashes[$fileName] -eq $newHash.Hash) {
+        Write-Output "Skipping $fileName"
+    } else {
+        glslangValidator -V $fileName -o $spvFileName
+        $hashes.$fileName = $newHash.Hash
+    }
+}
+
+Get-ChildItem -Filter *.vert | ForEach-Object {
+    CompileShader $_.Name
+}
+Get-ChildItem -Filter *.frag | ForEach-Object {
+    CompileShader $_.Name
+}
+
+Export-Clixml -Path $compileHashFile -InputObject $hashes