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app.go
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app.go
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package app
import (
"fmt"
"github.com/go-gl/glfw/v3.3/glfw"
vk "github.com/vulkan-go/vulkan"
)
const width = 800
const height = 600
type App struct {
instance vk.Instance
}
func New() *App {
app := &App{}
return app
}
func (a *App) Run() error {
var err error
win, err := a.initWindow()
if err != nil {
return err
}
err = a.initVulkan(win)
if err != nil {
return err
}
a.mainLoop(win)
a.cleanup(win)
return nil
}
func (a *App) initWindow() (*glfw.Window, error) {
err := glfw.Init()
if err != nil {
return nil, err
}
glfw.WindowHint(glfw.ClientAPI, glfw.NoAPI)
glfw.WindowHint(glfw.Resizable, glfw.False)
win, err := glfw.CreateWindow(width, height, "Vulkan", nil, nil)
if err != nil {
return nil, err
}
return win, nil
}
func (a *App) initVulkan(win *glfw.Window) error {
procAddr := glfw.GetVulkanGetInstanceProcAddress()
if procAddr == nil {
return fmt.Errorf("GetInstanceProcAddress is nil")
}
vk.SetGetInstanceProcAddr(procAddr)
err := vk.Init()
if err != nil {
return err
}
return a.createInstance(win)
}
func (a *App) mainLoop(win *glfw.Window) {
for !win.ShouldClose() {
glfw.PollEvents()
}
}
func (a *App) cleanup(win *glfw.Window) {
vk.DestroyInstance(a.instance, nil)
win.Destroy()
glfw.Terminate()
}
func (a *App) createInstance(win *glfw.Window) error {
glfwExtensions := win.GetRequiredInstanceExtensions()
var extensionCount uint32
vk.EnumerateInstanceExtensionProperties("", &extensionCount, nil)
extensionProperties := make([]vk.ExtensionProperties, extensionCount)
vk.EnumerateInstanceExtensionProperties("", &extensionCount, extensionProperties)
supportedExtensions := make(map[string]bool)
for _, extensionProperty := range extensionProperties {
extensionProperty.Deref()
supportedExtensions[vk.ToString(extensionProperty.ExtensionName[:])] = true
}
for _, glfwExtension := range glfwExtensions {
if !supportedExtensions[glfwExtension] {
return fmt.Errorf("glfwExtension - " + glfwExtension + " - is not supported by vulkan")
}
}
applicationInfo := vk.ApplicationInfo{
SType: vk.StructureTypeApplicationInfo,
PApplicationName: "Hello Triangle",
ApplicationVersion: vk.MakeVersion(1, 0, 0),
PEngineName: "No Engine",
EngineVersion: vk.MakeVersion(1, 0, 0),
ApiVersion: vk.MakeVersion(1, 0, 0),
}
instanceCreateInfo := vk.InstanceCreateInfo{
SType: vk.StructureTypeInstanceCreateInfo,
PApplicationInfo: &applicationInfo,
EnabledExtensionCount: uint32(len(glfwExtensions)),
PpEnabledExtensionNames: glfwExtensions,
}
var instance vk.Instance
res := vk.CreateInstance(&instanceCreateInfo, nil, &instance)
if res != vk.Success {
return fmt.Errorf("failed to create instance")
}
a.instance = instance
return nil
}