Add shader loading functionality

[no changelog]

src/main/kotlin/events/RegisterCustomShadersEvent.kt

@@ -0,0 +1,24 @@
+package moe.nea.firmament.events
+
+import com.mojang.datafixers.util.Pair
+import java.util.function.Consumer
+import net.minecraft.client.gl.ShaderProgram
+import net.minecraft.client.render.VertexFormat
+import net.minecraft.resource.ResourceFactory
+import moe.nea.firmament.Firmament
+
+data class RegisterCustomShadersEvent(
+    val list: MutableList<Pair<ShaderProgram, Consumer<ShaderProgram>>>,
+    val resourceFactory: ResourceFactory,
+) : FirmamentEvent() {
+    companion object : FirmamentEventBus<RegisterCustomShadersEvent>()
+
+    fun register(name: String, vertexFormat: VertexFormat, saver: Consumer<ShaderProgram>) {
+        require(name.startsWith("firmament_"))
+        try {
+            list.add(Pair.of(ShaderProgram(resourceFactory, name, vertexFormat), saver))
+        } catch (ex: Exception) {
+            Firmament.logger.fatal("Could not load firmament shader $name", ex)
+        }
+    }
+}

src/main/kotlin/util/render/FirmamentShaders.kt

@@ -0,0 +1,23 @@
+package moe.nea.firmament.util.render
+
+import net.minecraft.client.gl.ShaderProgram
+import net.minecraft.client.render.RenderPhase
+import net.minecraft.client.render.VertexFormats
+import moe.nea.firmament.annotations.Subscribe
+import moe.nea.firmament.events.RegisterCustomShadersEvent
+
+object FirmamentShaders {
+
+
+    private lateinit var _LINES: ShaderProgram
+    val LINES = RenderPhase.ShaderProgram({ _LINES })
+
+    @Subscribe
+    fun registerCustomShaders(event: RegisterCustomShadersEvent) {
+        event.register(
+            "firmament_rendertype_lines",
+            VertexFormats.LINES,
+            { _LINES = it },
+        )
+    }
+}

src/main/kotlin/util/render/RenderInWorldContext.kt

@@ -56,7 +56,7 @@ class RenderInWorldContext private constructor(
                                    false, false, // do we need translucent? i dont think so
                                    RenderLayer.MultiPhaseParameters.builder()
                                        .depthTest(RenderPhase.ALWAYS_DEPTH_TEST)
-                                       .program(RenderPhase.LINES_PROGRAM)
+                                       .program(FirmamentShaders.LINES)
                                        .build(false)
                                    )
     }
@@ -172,7 +172,7 @@ class RenderInWorldContext private constructor(
         points.zipWithNext().forEach { (a, b) ->
             val normal = Vector3f(b.x.toFloat(), b.y.toFloat(), b.z.toFloat())
                 .sub(a.x.toFloat(), a.y.toFloat(), a.z.toFloat())
-                .normalize()
+//                .normalize()
             val lastNormal0 = lastNormal ?: normal
             lastNormal = normal
             buffer.vertex(matrix.positionMatrix, a.x.toFloat(), a.y.toFloat(), a.z.toFloat())