work on compile command generation

README.md

@@ -0,0 +1,23 @@
+# Kettle
+Kettle is a zero dependency build system for HLSL, and GLSL shaders.
+
+## About
+Kettle is a build system for shaders. It takes in a build script, compiles the shaders, and prints a "registry" to standard error
+This registry file contains information on how to find the compiled shaders, relative to the build folder.
+
+## Usage
+```
+# Pipe stdout to /dev/null and stderr to Shaders.krg
+./kettle kettle.in > /dev/null 2> Shaders.krg
+
+cat Shaders.krg
+// Kettle shader registry file
+
+$Format SPIRV
+
+$ShaderList Vertex
+    $Shader HDR.bin
+    $Shader Shadows.bin
+    $Shader WorldShader.bin
+$EndShaderList
+```

kettle.c

@@ -1,8 +1,10 @@
 #include <dirent.h>
+#include <errno.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 
 /**
  * Kettle - Build system for HLSL and GLSL shaders
@@ -11,7 +13,11 @@
  */
 
 /// Type of file
-typedef enum { e_kettle_file_hlsl, e_kettle_file_glsl } kettle_file;
+typedef enum {
+  e_kettle_file_hlsl,
+  e_kettle_file_glsl,
+  e_kettle_file_unknown
+} kettle_file;
 
 typedef enum { e_kettle_compiler_dxc, e_kettle_compiler_glslc } kettle_compiler;
 
@@ -64,6 +70,16 @@ typedef struct {
   char **pArgs;
 } kettle_arg_list_t;
 
+kettle_file kettle_get_file_type(const char *pFileName) {
+  if (strstr(pFileName, ".glsl") != NULL) {
+    return e_kettle_file_glsl;
+  } else if (strstr(pFileName, ".hlsl") != NULL) {
+    return e_kettle_file_hlsl;
+  } else {
+    return e_kettle_file_unknown;
+  }
+}
+
 void kettle_help() {
   printf("Kettle Build System\n");
   printf("Description: Compiles kettle information files and prints the result "
@@ -111,6 +127,23 @@ char *kettle_pop_index(const char *pInput, int index) {
   return newStr;
 }
 
+/**
+ * Concat the contents of pInput with pInput2, automatically reallocating the
+ * memory of pInput
+ * @param pInput Input string buffer
+ * @param pInput2 Input to append to pInput
+ */
+char *kettle_str_concat(char *pInput, const char *pInput2) {
+  int newSize = strlen(pInput) + strlen(pInput2) + 1; // +1 for null byte
+  newSize *= sizeof(char);
+
+  pInput = realloc(pInput, newSize);
+
+  strcat(pInput, pInput2);
+
+  return pInput;
+}
+
 kettle_arg_list_t kettle_make_arg_list(const char *pInput) {
   int size = strlen(pInput);
 
@@ -237,6 +270,30 @@ void kettle_handle_cmd(kettle_arg_list_t argList, kettle_input_t *pInput) {
       printf("> Error: Cannot add shader when no compiler batch is active!\n");
       exit(EXIT_FAILURE);
     }
+
+    const char *pFileName = argList.pArgs[1];
+
+    kettle_file_info_t fileInf;
+    memset(&fileInf, 0, sizeof(fileInf));
+    fileInf.eFileType = kettle_get_file_type(pFileName);
+
+    if (fileInf.eFileType == e_kettle_file_unknown) {
+      printf("> Error: Cannot determine file type of path '%s'!\n", pFileName);
+      exit(EXIT_FAILURE);
+    }
+
+    fileInf.pFileName = pFileName;
+
+    // Allocate a new file
+
+    pInput->pCurrentCompilerBatch->numFiles++;
+
+    pInput->pCurrentCompilerBatch->pFiles = (kettle_file_info_t *)realloc(
+        pInput->pCurrentCompilerBatch->pFiles,
+        sizeof(kettle_file_info_t) * pInput->pCurrentCompilerBatch->numFiles);
+
+    pInput->pCurrentCompilerBatch
+        ->pFiles[pInput->pCurrentCompilerBatch->numFiles - 1] = fileInf;
   } else {
     printf("> Warning: Cannot process unknown compiler command '%s'\n", pCmd);
   }
@@ -284,6 +341,22 @@ kettle_input_t kettle_read_input(const char *pInput) {
   return input;
 }
 
+const char *kettle_hlsl_compile(const kettle_compiler_t *pCompiler,
+                                const kettle_compiler_batch_t *pBatch,
+                                const kettle_file_info_t *pFileInfo) {
+  char *pCommand =
+      (char *)malloc((strlen(pCompiler->pCompilerPath) + 1) * sizeof(char));
+
+  strcpy(pCommand, pCompiler->pCompilerPath);
+
+  // This might be a little slow, but we need to create the command
+
+  // We force the DXC compiler to output spirv, this could change later
+  pCommand = kettle_str_concat(pCommand, " -spirv");
+
+  return pCommand;
+}
+
 int main(int argc, char **argv) {
   if (argc <= 1) {
     kettle_help();
@@ -294,5 +367,34 @@ int main(int argc, char **argv) {
 
   printf("> Will process input file: %s\n", inFile);
 
-  kettle_read_input(inFile);
+  kettle_input_t inputProcessed = kettle_read_input(inFile);
+
+  printf("> Will process %i compiler batche(s)...\n",
+         inputProcessed.numCompilerBatches);
+
+  for (int i = 0; i < inputProcessed.numCompilerBatches; ++i) {
+    const kettle_compiler_batch_t batch = inputProcessed.pCompilerBatches[i];
+
+    printf("> Change directory to: %s\n", batch.pWorkingDir);
+
+    if (chdir(batch.pWorkingDir) != 0) {
+      printf("> Error: Failed to chdir into new directory: %s\n",
+             strerror(errno));
+      exit(EXIT_FAILURE);
+    }
+
+    for (int x = 0; x < batch.numFiles; ++x) {
+      kettle_file_info_t file = batch.pFiles[x];
+
+      kettle_compiler_t *pCompiler =
+          kettle_input_get_compiler(&inputProcessed, e_kettle_compiler_dxc);
+
+      if (pCompiler == NULL) {
+        printf("> Error: Failed to find compatible DXC compiler!\n");
+        exit(EXIT_FAILURE);
+      }
+
+      printf("> %s\n", kettle_hlsl_compile(pCompiler, &batch, &file));
+    }
+  }
 }