freedreno-triangle/triangle.cc

#include <png.h>
#include <vulkan/vulkan.h>

#include <iostream>
#include <vector>

const uint32_t kWidth = 16;
const uint32_t kHeight = 16;

int main() {
  // Example code for creating a VkInstance.
  VkApplicationInfo app_info = {};
  app_info.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO;
  app_info.apiVersion = VK_API_VERSION_1_1;

  VkInstanceCreateInfo create_info = {};
  create_info.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO;
  create_info.pApplicationInfo = &app_info;
  create_info.enabledExtensionCount = 0;
  create_info.ppEnabledExtensionNames = nullptr;
  create_info.enabledLayerCount = 0;
  create_info.ppEnabledLayerNames = nullptr;

  VkInstance instance;
  VkResult res = vkCreateInstance(&create_info, nullptr, &instance);
  if (res != VK_SUCCESS) {
    std::cerr << "Error creating VkInstance: " << res;
  }

  // Example code for exporting a PNG.
  FILE *f = fopen("triangle.png", "wb");

  std::vector<uint8_t> pixels(kWidth * kHeight * 4);
  for (size_t i = 0; i < kHeight; i++) {
    for (size_t j = 0; j < kWidth; j++) {
      uint32_t base_index = (i * kWidth * 4) + (j * 4);
      pixels[base_index] = 255;
      pixels[base_index + 1] = 255;
      pixels[base_index + 2] = 0;
      pixels[base_index + 3] = 255;
    }
  }

  png_image image_info = {};
  image_info.version = PNG_IMAGE_VERSION;
  image_info.width = kWidth;
  image_info.height = kHeight;
  image_info.format = PNG_FORMAT_RGBA;
  if (png_image_write_to_stdio(&image_info, f, 0, pixels.data(), kWidth * 4, nullptr) == 0) {
    std::cout << "Error writing PNG: " << image_info.message << std::endl;
  }

  fclose(f);

  return 0;
}