From d596dfc579d87662f84254a51d0e5e1d1b1c6299 Mon Sep 17 00:00:00 2001
From: Warwick New <warwick.l.e.new@gmail.com>
Date: Mon, 6 Jan 2025 14:51:40 +0000
Subject: [PATCH] Added helper function for loading shaders into buffers

---
 src/main.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 57 insertions(+), 6 deletions(-)

diff --git a/src/main.c b/src/main.c
index ad51a50..efaad3b 100644
--- a/src/main.c
+++ b/src/main.c
@@ -183,17 +183,12 @@ void createInstance(Application *app) {
     }
   }
 
-  // This currently leaks memory :(
+  // This currently leaks memory on laptop :(
   VkResult result = vkCreateInstance(&createInfo, NULL, &app->instance);
   if (result != VK_SUCCESS) {
     fprintf(stderr, "Failed to create vulkan instance\n");
     exit(EXIT_FAILURE);
   }
-
-  //printf("Instance Extentions Available:\n");
-  //for (uint i = 0; i < extensionCount; i++) {
-  //  printf("\t%s\n", extensions[i].extensionName);
-  //}
 }
 
 void initWindow(Application *app) {
@@ -615,6 +610,61 @@ void createImageViews(Application *app) {
   }
 }
 
+// Buffer should be freed
+typedef struct {
+  char *buffer;
+  size_t bufferSize;
+} ShaderBuffer;
+
+ShaderBuffer loadShaderIntoBuffer(const char *fileLocation) {
+  ShaderBuffer buf = {.buffer = NULL, .bufferSize = 0};
+  FILE *file = fopen(fileLocation, "r");
+
+  if (file == NULL) {
+    fprintf(stderr, "Could not open file \"%s\"!\n", fileLocation);
+    exit(EXIT_FAILURE);
+  }
+
+  if (fseek(file, 0L, SEEK_END) != 0) {
+    fprintf(stderr, "Could not seek to the end of file \"%s\"!\n",
+            fileLocation);
+    exit(EXIT_FAILURE);
+  }
+  buf.bufferSize = ftell(file);
+
+  if (fseek(file, 0L, SEEK_SET) != 0) {
+    fprintf(stderr, "Could not seek to the start of file \"%s\"!\n",
+            fileLocation);
+    exit(EXIT_FAILURE);
+  }
+  buf.buffer = malloc(sizeof(char) * (buf.bufferSize)); // Not '\0' terminting ourselves
+
+  size_t tempSize = fread(buf.buffer, sizeof(char), buf.bufferSize, file);
+  if (ferror(file) != 0) {
+    fprintf(stderr, "Error reading file into buffer \"%s\"!\n", fileLocation);
+    exit(EXIT_FAILURE);
+  }
+  fclose(file);
+
+  return buf;
+}
+
+void createGraphicsPipeline(Application *app) {
+  ShaderBuffer vertShader = loadShaderIntoBuffer("shaders/shader.vert.spv");
+  for (int i = 0; i < vertShader.bufferSize;i++){
+    printf("%c",vertShader.buffer[i]);
+  }
+  printf("\n");
+  ShaderBuffer fragShader = loadShaderIntoBuffer("shaders/shader.frag.spv");
+  for (int i = 0; i < fragShader.bufferSize;i++){
+    printf("%c",fragShader.buffer[i]);
+  }
+  printf("\n");
+
+  free(vertShader.buffer);
+  free(fragShader.buffer);
+}
+
 void initVulkan(Application *app) {
   createInstance(app);
   setupDebugMessenger(app);
@@ -623,6 +673,7 @@ void initVulkan(Application *app) {
   createLogicalDevice(app);
   createSwapChain(app);
   createImageViews(app);
+  createGraphicsPipeline(app);
 }
 
 void mainLoop(Application *app) {