camera

Author: jackmott

hellotriangle/assets/metal-credits.txt

@@ -0,0 +1,2 @@
+Metal Textures By:
+https://opengameart.org/users/lukerustltd

hellotriangle/assets/metalbox_AO.png

@@ -10,6 +10,7 @@ import (
 	"github.com/go-gl/mathgl/mgl32"
 	"github.com/jackmott/gogl"
 	"github.com/veandco/go-sdl2/sdl"
+	"time"
 )
 
 const winWidth = 1280
@@ -27,13 +28,15 @@ func main() {
 	sdl.GLSetAttribute(sdl.GL_CONTEXT_MINOR_VERSION, 3)
 
 	window, err := sdl.CreateWindow("Hello Triangle", 200, 200, winWidth, winHeight, sdl.WINDOW_OPENGL)
+	sdl.SetRelativeMouseMode(true)
 	if err != nil {
 		panic(err)
 	}
 	window.GLCreateContext()
 	defer window.Destroy()
 
 	gl.Init()
+	gl.Enable(gl.DEPTH_TEST)
 	gogl.MglTest()
 
 	fmt.Println("OpenGL Version", gogl.GetVersion())
@@ -43,7 +46,7 @@ func main() {
 		panic(err)
 	}
 
-	texture := gogl.LoadTextureAlpha("assets/tex.png")
+	texture := gogl.LoadTextureAlpha("assets/metalbox_full.png")
 
 	vertices := []float32{
 		-0.5, -0.5, -0.5, 0.0, 0.0,
@@ -105,37 +108,45 @@ func main() {
 
 	keyboardState := sdl.GetKeyboardState()
 
-	var x float32
-	var z float32
+	position := mgl32.Vec3{0.0, 0.0, 0.0}
+	worldUp := mgl32.Vec3{0.0, 1.0, 0.0}
 
+	camera := gogl.NewCamera(position, worldUp, -90.0, 0.0, 0.02, 0.1)
+	var elapsedTime float32
+	prevMouseX, prevMouseY, _ := sdl.GetMouseState()
 	for {
+		frameStart := time.Now()
 		for event := sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
 			switch event.(type) {
 			case *sdl.QuitEvent:
 				return
 			}
 		}
 
-		gl.ClearColor(0.0, 0.0, 0.0, 0.0)
-		gl.Clear(gl.COLOR_BUFFER_BIT)
-
+		dir := gogl.Nowhere
 		if keyboardState[sdl.SCANCODE_LEFT] != 0 {
-			x = x - .1
+			dir = gogl.Left
 		}
 		if keyboardState[sdl.SCANCODE_RIGHT] != 0 {
-			x = x + .1
+			dir = gogl.Right
 		}
 		if keyboardState[sdl.SCANCODE_UP] != 0 {
-			z = z + .1
+			dir = gogl.Forward
 		}
 		if keyboardState[sdl.SCANCODE_DOWN] != 0 {
-			z = z - .1
+			dir = gogl.Backward
 		}
 
+		mouseX, mouseY, _ := sdl.GetMouseState()
+		camera.UpdateCamera(dir, elapsedTime, float32(mouseX-prevMouseX), float32(mouseY-prevMouseY))
+		prevMouseX = mouseX
+		prevMouseY = mouseY
+		gl.ClearColor(0.0, 0.0, 0.0, 0.0)
+		gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
+
 		shaderProgram.Use()
 		projectionMatrix := mgl32.Perspective(mgl32.DegToRad(45.0), float32(winWidth)/float32(winHeight), 0.1, 100.0)
-		viewMatrix := mgl32.Ident4()
-		viewMatrix = mgl32.Translate3D(x, 0.0, z)
+		viewMatrix := camera.GetViewMatrix()
 		shaderProgram.SetMat4("projection", projectionMatrix)
 		shaderProgram.SetMat4("view", viewMatrix)
 		gogl.BindTexture(texture)
@@ -152,5 +163,6 @@ func main() {
 
 		window.GLSwap()
 		shaderProgram.CheckShaderForChanges()
+		elapsedTime = float32(time.Since(frameStart).Seconds() * 1000)
 	}
 }