#include "vk_pipelines.h"
#include <fstream>
#include "vk_initializers.h"
#include <print>

bool vkutil::load_shader_module(const char* filePath,
    VkDevice device,
    VkShaderModule* outShaderModule)
{
  std::ifstream file(filePath, std::ios::ate | std::ios::binary);

  if(!file.is_open()) {
    std::println("failed to open file: {}", filePath);
    return false;
  }

  size_t fileSize = (size_t)file.tellg();

  //spirv expects the buffer to uint32
  std::vector<uint32_t> buffer(fileSize / sizeof(uint32_t));
  file.seekg(0);
  file.read((char*)buffer.data(), fileSize);

  file.close();

  VkShaderModuleCreateInfo createInfo = {
    .sType = VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO,
    .pNext = nullptr,
    // codeSize has to be in bytes
    .codeSize = buffer.size() * sizeof(uint32_t),
    .pCode = buffer.data(),
  };

  VkShaderModule shaderModule;
  if(vkCreateShaderModule(device, &createInfo, nullptr, &shaderModule) != VK_SUCCESS) {
    std::println("Error after vkCreateShaderModule");
    return false;
  }

  *outShaderModule = shaderModule;
  return true;
}