add more models examples

examples/models/mesh_generation/main.go

@@ -0,0 +1,102 @@
+package main
+
+import (
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+func main() {
+	screenWidth := int32(1280)
+	screenHeight := int32(720)
+
+	numModels := 8
+
+	rl.InitWindow(screenWidth, screenHeight, "raylib [models] example - mesh generation")
+
+	camera := rl.Camera{}
+	camera.Position = rl.NewVector3(10.0, 5.0, 10.0)
+	camera.Target = rl.NewVector3(0.0, 0.0, 0.0)
+	camera.Up = rl.NewVector3(0.0, 1.0, 0.0)
+	camera.Fovy = 45.0
+	camera.Projection = rl.CameraPerspective
+
+	checked := rl.GenImageChecked(2, 2, 1, 1, rl.Black, rl.Red)
+	texture := rl.LoadTextureFromImage(checked)
+	rl.UnloadImage(checked)
+
+	models := make([]rl.Model, numModels)
+
+	models[0] = rl.LoadModelFromMesh(rl.GenMeshPlane(2, 2, 4, 3))
+	models[1] = rl.LoadModelFromMesh(rl.GenMeshCube(2, 1, 2))
+	models[2] = rl.LoadModelFromMesh(rl.GenMeshSphere(2, 32, 32))
+	models[3] = rl.LoadModelFromMesh(rl.GenMeshHemiSphere(2, 16, 16))
+	models[4] = rl.LoadModelFromMesh(rl.GenMeshCylinder(1, 2, 16))
+	models[5] = rl.LoadModelFromMesh(rl.GenMeshTorus(0.25, 4, 16, 32))
+	models[6] = rl.LoadModelFromMesh(rl.GenMeshKnot(1, 2, 16, 128))
+	models[7] = rl.LoadModelFromMesh(rl.GenMeshPoly(5, 2))
+
+	for i := 0; i < numModels; i++ {
+		rl.SetMaterialTexture(models[i].Materials, rl.MapDiffuse, texture)
+	}
+
+	position := rl.Vector3Zero()
+
+	currentModel := 0
+
+	rl.SetTargetFPS(60)
+
+	for !rl.WindowShouldClose() {
+
+		rl.UpdateCamera(&camera, rl.CameraOrbital)
+
+		if rl.IsKeyPressed(rl.KeyUp) {
+			currentModel++
+			if currentModel >= numModels {
+				currentModel = 0
+			}
+		}
+
+		rl.BeginDrawing()
+
+		rl.ClearBackground(rl.RayWhite)
+
+		rl.BeginMode3D(camera)
+
+		rl.DrawModel(models[currentModel], position, 1, rl.White)
+		rl.DrawGrid(10, 1)
+
+		rl.EndMode3D()
+
+		rl.DrawRectangle(10, 10, 310, 30, rl.Fade(rl.SkyBlue, 0.5))
+		rl.DrawRectangleLines(10, 10, 310, 30, rl.Fade(rl.DarkBlue, 0.5))
+		rl.DrawText("UP ARROW KEY TO CHANGE MODELS", 20, 20, 10, rl.Blue)
+
+		txt := "PLANE"
+		switch currentModel {
+		case 1:
+			txt = "CUBE"
+		case 2:
+			txt = "SPHERE"
+		case 3:
+			txt = "HEMISPHERE"
+		case 4:
+			txt = "CYLINDER"
+		case 5:
+			txt = "TORUS"
+		case 6:
+			txt = "KNOT"
+		case 7:
+			txt = "POLY"
+		}
+		txtlen := rl.MeasureText(txt, 20)
+		rl.DrawText(txt, screenWidth/2-txtlen/2, 10, 20, rl.DarkBlue)
+
+		rl.EndDrawing()
+	}
+
+	rl.UnloadTexture(texture)
+	for i := 0; i < numModels; i++ {
+		rl.UnloadModel(models[i])
+	}
+
+	rl.CloseWindow()
+}