wumo / vkgKt

Kotlin binding for [vkg](https://github.com/wumo/vkg)

vkgKt

Kotlin binding for vkg

• Deferred Shading
• Cascaded Shadow Mapping
• Atmospheric Rendering
• Ray tracing on NVIDIA RTX graphics card
• Load glTF models.
• Update vertices/transforms/materials/lights per frame.

Usage

Requirements:

• Graphics driver that supports Vulkan 1.2.0
• RayTracing Feature requires RTX 20 series graphics card.

gradle:

• Add jitpack.io in your root build.gradle.kts at the end of repositories:

repositories {
    mavenCentral()
    maven(url = "https://jitpack.io")
}

• Add the dependency

implementation("com.github.wumo:vkgKt:0.0.6")

Sample code:

import com.github.wumo.vkg.graphics.*
import com.github.wumo.vkg.math.vector.*
import com.github.wumo.vkg.graphics.model.MaterialType
import com.github.wumo.vkg.graphics.util.PanningCamera

fun main() {
  // window and renderer setting
  val app = Renderer.newRenderer(
    WindowConfig("Sample", 1080, 720),
    FeatureConfig(numFrames = 2, rayTrace = true)
  )
  // scene setting
  val scene = app.addScene(
    SceneConfig(
      maxNumTransforms = 100_0000,
      maxNumPrimitives = 100_000,
      maxNumMeshInstances = 100_0000
    )
  )
  // atmosphere setting
  val sky = scene.atmosphere
  sky.enabled = true
  sky.sunIntensity = 1f
  sky.sunDirection = Vec3(-1f, -0.1f, 0f)

  // primitive
  val primitives = scene.newPrimitives {
    sphere(Vec3(), 1f)
    newPrimitive()
  }
  // material
  val mat = scene.newMaterial(MaterialType.BRDF)
  mat.colorFactor = Vec4(0f, 1f, 0f, 1f)
  mat.pbrFactor = Vec4(0f, 0.3f, 0.4f, 0f)
  // primitive + material => mesh
  val mesh = scene.newMesh(primitives[0], mat)
  // mesh => node
  val node = scene.newNode()
  node.addMeshes(mesh)
  // node => model
  val model = scene.newModel(node)
  // model => instance
  val sphere = scene.newModelInstance(model)

  // scene camera setting
  val camera = scene.camera
  camera.location = Vec3(-5.610391f, 0.049703f, 16.386591f)
  camera.direction = Vec3(5.610391f, -0.049703f, -16.386591f)

  // using builtin panning camera to change view
  val panningCamera = PanningCamera(camera)
  // capture input
  val input = app.window.input

  //render loop
  app.loop { frameIdx, elapsedMs ->
    // update camera from input
    panningCamera.update(input)

    // apply transform per frame
    val t = sphere.transform.translation
    t.x -= elapsedMs.toFloat() * 0.001f
    sphere.transform.translation = t
  }
}