add more model & shader examples

examples/models/gltf_loading/main.go

@@ -0,0 +1,74 @@
+package main
+
+import (
+	"fmt"
+
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+func main() {
+	screenWidth := int32(1280)
+	screenHeight := int32(720)
+
+	rl.InitWindow(screenWidth, screenHeight, "raylib [models] example - gltf loading")
+
+	camera := rl.Camera{}
+	camera.Position = rl.NewVector3(5.0, 5.0, 5.0)
+	camera.Target = rl.NewVector3(0.0, 2.0, 0.0)
+	camera.Up = rl.NewVector3(0.0, 1.0, 0.0)
+	camera.Fovy = 45.0
+	camera.Projection = rl.CameraPerspective
+
+	model := rl.LoadModel("robot.glb")
+
+	animIndex := 0
+	animCurrentFrame := 0
+
+	modelAnims := rl.LoadModelAnimations("robot.glb")
+
+	position := rl.NewVector3(0, 0, 0)
+	rl.DisableCursor()
+
+	rl.SetTargetFPS(60)
+
+	for !rl.WindowShouldClose() {
+
+		rl.UpdateCamera(&camera, rl.CameraOrbital)
+
+		if rl.IsKeyPressed(rl.KeyUp) {
+			animIndex++
+			if animIndex >= len(modelAnims) {
+				animIndex = 0
+			}
+		}
+		if rl.IsKeyPressed(rl.KeyDown) {
+			animIndex--
+			if animIndex < 0 {
+				animIndex = len(modelAnims) - 1
+			}
+		}
+
+		animPlaying := modelAnims[animIndex]
+		animCurrentFrame = (animCurrentFrame + 1) % int(animPlaying.FrameCount)
+		rl.UpdateModelAnimation(model, animPlaying, int32(animCurrentFrame))
+
+		rl.BeginDrawing()
+
+		rl.ClearBackground(rl.RayWhite)
+
+		rl.BeginMode3D(camera)
+
+		rl.DrawModel(model, position, 0.8, rl.White)
+
+		rl.EndMode3D()
+
+		rl.DrawText("current animation number: "+fmt.Sprint(animIndex), 10, 10, 10, rl.Black)
+		rl.DrawText("UP/DOWN ARROW KEYS CHANGE ANIMATION", 10, 30, 10, rl.Black)
+
+		rl.EndDrawing()
+	}
+
+	rl.UnloadModel(model)
+
+	rl.CloseWindow()
+}