Small kool showcase examples #532

elect86 · 2023-05-26T19:06:50Z

As titled:

added kool library dependency
switched code in Geometry::recalculateNormals and Icosphere constructor to pointers
added some pointers and typealias utils
using kool constructors and methods to allocate buffers

- switched code in `Geometry::recalculateNormals` and `Icosphere` constructor to pointers - added some pointers and typealias utils - using kool constructors and methods to allocate buffers

… the still missing bitwise operators in Kotlin), fixing with parenthesis

elect86 · 2023-05-30T07:59:16Z

Also, it's important to think about when to run the buffers deallocation, otherwise Scenery leaks

I can investigate also in this direction, if you want

ctrueden

Here are some thoughts based on my naive reading of the code, as a Kotlin newbie. Maybe some of it helps, I dunno! 🤷 👍

ctrueden · 2023-06-14T14:04:57Z

build.gradle.kts

@@ -22,6 +22,7 @@ repositories {
    mavenCentral()
    maven("https://maven.scijava.org/content/groups/public")
    maven("https://jitpack.io")
+    maven("https://raw.githubusercontent.com/kotlin-graphics/mary/master")


Can we please get artifacts deployed to maven.scijava.org, instead of a custom GitHub-based repository, which should not be done?

What shouldn't be done is loading big jars (ie fat jars)

This is not the case, the ones I push weight few KBs

It shouldn't be done at all IMHO—now you have to run that repo forever or else old builds will break. And as described in that article, it creates a situation where there's another repository that has to be queried for all the dependencies, slowing down builds. Just release the projects on maven.scijava.org or oss.sonatype.org! Once you have the infrastructure in place for Sonatype, deploying is a button push—the only huge PITA is getting it set up at the beginning.

now you have to run that repo forever or else old builds will break.

True, but you know what I have to do to run it forever? Just avoid deleting it

I might be move everything to maven, though (here)

I'd love to deploy to maven.scijava.org, but I have a dev way to release very often and that wasn't compatible with that, or do I recall it wrong?

Publishing to maven.scijava.org is just a standard deploy over WebDAV, I'm sure the Gradle tooling will support it with your credentials both manually and/or automatically. As long as your tooling doesn't try to deploy the same release artifact more than once, which is forbidden due to release artifacts being immutable.

How much does it take the publication over there? How long before it's available for consumption?

Artifacts published to maven.scijava.org are available instantly. Artifacts published to oss.sonatype.org (or s01.oss.sonatype.org) are available instantly from those URLs, but typically take 10-30 minutes to get mirrored over to Maven Central.

ctrueden · 2023-06-14T14:07:44Z

src/main/kotlin/graphics/scenery/Icosphere.kt

@@ -73,11 +82,11 @@ open class Icosphere(val radius: Float, val subdivisions: Int) : Mesh("Icosphere

    protected fun refineTriangles(recursionLevel: Int,
                                  vertices: MutableList<Vector3f>,
-                                  indices: MutableList<Triple<Int, Int, Int>>): MutableList<Triple<Int, Int, Int>> {
+                                  indices: MutableList<Face>): MutableList<Face> {


Hooray for type aliasing! 🏆

ctrueden · 2023-06-14T14:08:29Z

src/main/kotlin/graphics/scenery/Icosphere.kt

@@ -124,7 +133,7 @@ open class Icosphere(val radius: Float, val subdivisions: Int) : Mesh("Icosphere
        val i = this.addVertex(middle)

        // store it, return index
-        middlePointIndexCache.put(key, i)
+        middlePointIndexCache[key] = i


@elect86 Do you notice these manually, or lean on an IDE cleanup/simplification action? If so, what is it?

If suggested, "Alt+Enter" opens the action dialog and then you select the suggestion

Otherwise you need to explicitely call .set in order to force the IDE to pull in the correct import and then execute the suggestion

ctrueden · 2023-06-14T14:12:05Z

src/main/kotlin/graphics/scenery/Icosphere.kt

-
-            vertices.flip()
-            normals.flip()
-            texcoords.flip()


Just to be sure: the kool FloatBuffer does not require flipping, whereas the one allocated by BufferUtils does?

I'm using absolute methods to upload data, that's why

Cool, I just wanted to make sure these lines didn't get dropped by accident. 👍

ctrueden · 2023-06-14T14:17:03Z

src/main/kotlin/graphics/scenery/attribute/geometry/Geometry.kt

+        for (i in vertices.indices step 3) {
+            val v1 = pVtx++[0]
+            val v2 = pVtx++[0]
+            val v3 = pVtx++[0]


This is super concise, but I find it harder to understand. Maybe a middle ground could be:

fun makeVector(array, i) { return Vector3f(array[i], array[i + 1], array[i + 2]) } val v1 = makeVector(vertexBufferView, i += 3) val v2 = makeVector(vertexBufferView, i += 3) val v3 = makeVector(vertexBufferView, i += 3)

or some such? Or even attach a toVector(i) method to the FloatBuffer class here?

It is fun to use overloaded operators, but the pointer thing with [0] is strange.

it's essentially *pVtx++

Another alternative:

for (i in vertices.indices step 3) { val v1 = pVtx[i] val v2 = pVtx[i + 1] val v3 = pVtx[i + 2]

Nice, I like that much more!

ctrueden · 2023-06-14T14:19:18Z

src/main/kotlin/graphics/scenery/utils/pointers.kt

+package graphics.scenery.utils
+
+import kool.Ptr
+import kool.unsafe


❗ unsafe? Like sun.misc.Unsafe? Do you discourage its use? Or...?

Yep, atm it's the way for low level native operations

The whole Lwjgl ultimately rely on that as well

ctrueden · 2023-06-14T14:22:38Z

src/test/kotlin/graphics/scenery/tests/examples/compute/CustomVolumeManagerExample.kt

@@ -40,7 +41,7 @@ class CustomVolumeManagerExample : SceneryBase("CustomVolumeManagerExample") {
            ))
        volumeManager.customTextures.add("OutputRender")

-        val outputBuffer = MemoryUtil.memCalloc(1280*720*4)
+        val outputBuffer = ByteBuffer(1280*720*4)


I love the conciseness of this. But it makes me nervous that the kool buffer types are named ByteBuffer and FloatBuffer, when java.nio also has classes with those names. Does the possibility of name clashes or reader confusion concern you? If so, you could rename the kool buffer types to something else like KoolByteBuffer and KoolFloatBuffer, or Uint8Buffer and Float32Buffer.

They look like types, but are methods instead. It's a technique called fake/dummy constructors.

You'll recognize those in the IDE by being in italics

It's coherent with the current way to allocate Arrays and Lists

val ints = IntArray(2)
val ints = List(2) { i -> i + 1 }

Nice. As long as they are actually returning ByteBuffer and FloatBuffer objects, that's awesome.

elect86 added 3 commits May 26, 2023 21:05

- added kool library dependency

bacf72e

- switched code in `Geometry::recalculateNormals` and `Icosphere` constructor to pointers - added some pointers and typealias utils - using kool constructors and methods to allocate buffers

- shl has lower priority than multiplication (this is a drawback of…

91212c2

… the still missing bitwise operators in Kotlin), fixing with parenthesis

- fixed signature operators name clashing

ce2d783

ctrueden reviewed Jun 14, 2023

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Small kool showcase examples #532

Small kool showcase examples #532

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Small kool showcase examples #532

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Small kool showcase examples #532

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