tofu

commit fc6eaa5e3954f98dbe2255dbce581d24a3371d74
parent 58dfa4db77cc69654cded4da4554c84fee8f4c2a
Author: Matsuda Kenji <info@mtkn.jp>
Date:   Wed, 16 Oct 2024 21:14:24 +0900

complete hello-window

Diffstat:
M
cmd/sample/main.go
 | 
40
+++++++++++++++++++++++++++++++++++++---

1 file changed, 37 insertions(+), 3 deletions(-)
diff --git a/cmd/sample/main.go b/cmd/sample/main.go
@@ -1,27 +1,61 @@
 package main
 
 import (
+	"log"
+	"math"
 	"runtime"
+
+	"github.com/go-gl/gl/v3.3-core/gl"
 	"github.com/go-gl/glfw/v3.3/glfw"
 )
 
+const (
+	winW, winH = 800, 600
+)
+
 func init() {
 	runtime.LockOSThread()
 }
 
+func framebufferSizeCallback(w *glfw.Window, width int, height int) {
+	if (width > math.MaxInt32 || height > math.MaxInt32) {
+		log.Fatal("framebufferSizeCallback: integer overflow")
+	}
+	gl.Viewport(0, 0, int32(width), int32(height))
+}
+
+func processInput(w *glfw.Window) {
+	if w.GetKey(glfw.KeyQ) == glfw.Press {
+		w.SetShouldClose(true);
+	}
+}
+
 func main() {
 	err := glfw.Init()
 	if err != nil {
-		panic(err)
+		log.Fatalf("init glfw: %v", err)
 	}
 	defer glfw.Terminate()
+	glfw.WindowHint(glfw.ContextVersionMajor, 3)
+	glfw.WindowHint(glfw.ContextVersionMinor, 3)
+	glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
 
-	window, err := glfw.CreateWindow(640, 480, "Testing", nil, nil)
+	window, err := glfw.CreateWindow(winW, winH, "Testing", nil, nil)
 	if err != nil {
-		panic(err)
+		log.Fatalf("create window: %v", err)
 	}
 	window.MakeContextCurrent()
+	if err = gl.Init(); err != nil {
+		log.Fatalf("init gl: %v", err)
+	}
+	gl.Viewport(0, 0, winW, winH)
+
+	window.SetFramebufferSizeCallback(framebufferSizeCallback)
+
 	for !window.ShouldClose() {
+		processInput(window)
+		gl.ClearColor(0.2, 0.3, 0.3, 1.0)
+		gl.Clear(gl.COLOR_BUFFER_BIT)
 		window.SwapBuffers()
 		glfw.PollEvents()
 	}