fix wrong render order, improve block item rendering

src/integration-test/kotlin/de/bixilon/minosoft/gui/rendering/system/base/RenderOrderTest.kt

@@ -34,6 +34,6 @@ class RenderOrderTest {
         val result: MutableList<Int> = mutableListOf()
         order.iterateReverse { position, uv -> result += position; result += uv }
 
-        assertEquals(result, listOf(0, 9, 3, 6, 2, 7, 1, 8))
+        assertEquals(result, listOf(3, 6, 2, 7, 1, 8, 0, 9))
     }
 }

src/main/java/de/bixilon/minosoft/gui/rendering/gui/GUIRenderer.kt

@@ -97,7 +97,6 @@ class GUIRenderer(
             destinationRGB = BlendingFunctions.ONE_MINUS_SOURCE_ALPHA,
             sourceAlpha = BlendingFunctions.ONE,
             destinationAlpha = BlendingFunctions.ONE_MINUS_SOURCE_ALPHA,
-            faceCulling = false,
         )
         shader.use()
     }

src/main/java/de/bixilon/minosoft/gui/rendering/models/block/state/render/BlockGUIConsumer.kt

@@ -48,7 +48,7 @@ class BlockGUIConsumer(
         val tint = (lightTint.toBits() shl 8) or 0xFF
 
 
-        gui.context.system.quadOrder.iterate { p, uv ->
+        gui.context.system.quadOrder.iterateReverse { p, uv ->
             val vertexOffset = p * Vec3.length
             val uvOffset = uv * Vec2.length
 
@@ -56,10 +56,9 @@ class BlockGUIConsumer(
 
             val out = matrix * xyz
 
-            val x = ((out.x) * size.x) + offset.x + 1.0f
-            val y = ((-out.y + 0.75f) * size.y) + offset.y
-
-            // TODO: depth
+            val x = ((out.x + 0.8f) * size.x) + offset.x + 1.0f
+            val y = ((-out.y + 0.81f) * size.y) + offset.y
+            // values fresh from my ass
 
             consumer.addVertex(x, y, textureId, uvData[uvOffset], uvData[uvOffset + 1], tint, options)
         }

src/main/java/de/bixilon/minosoft/gui/rendering/models/raw/display/ModelDisplay.kt

@@ -28,11 +28,15 @@ data class ModelDisplay(
     val scale: Vec3 = Vec3.ONE,
 ) {
     val matrix = Mat4()
-        .translateAssign(translation)
-        .rotateRadAssign(rotation)
         .scaleAssign(scale)
+        .translateAssign(translation)
+        .translateAssign(CENTER)
+        .rotateRadAssign(rotation)
+        .translateAssign(N_CENTER)
 
     companion object {
+        val CENTER = Vec3(0.5f)
+        val N_CENTER = -CENTER
         val DEFAULT = ModelDisplay()
 
         fun deserialize(data: JsonObject): ModelDisplay {

src/main/java/de/bixilon/minosoft/gui/rendering/system/base/RenderOrder.kt

@@ -36,10 +36,9 @@ class RenderOrder(
 
     inline fun iterateReverse(vertex: (position: Int, uv: Int) -> Unit) {
         if (size == 0) return
-        this.vertex(0, vertex)
 
         var index = order.size - 1 - 1 // index, element alignment
-        while (index > 1) {
+        while (index >= 0) {
             this.vertex(index, vertex)
             index -= 2
         }