Add lines to world renderer

1 files changed, 61 insertions, 5 deletions

diff --git a/src/main/kotlin/moe/nea/firmament/util/render/RenderInWorldContext.kt b/src/main/kotlin/moe/nea/firmament/util/render/RenderInWorldContext.kt
index 59a949a..9c38145 100644
--- a/src/main/kotlin/moe/nea/firmament/util/render/RenderInWorldContext.kt
+++ b/src/main/kotlin/moe/nea/firmament/util/render/RenderInWorldContext.kt
@@ -19,7 +19,9 @@
 package moe.nea.firmament.util.render
 
 import com.mojang.blaze3d.systems.RenderSystem
+import java.lang.Math.pow
 import org.joml.Matrix4f
+import org.joml.Vector3f
 import net.minecraft.client.gl.VertexBuffer
 import net.minecraft.client.render.BufferBuilder
 import net.minecraft.client.render.Camera
@@ -28,10 +30,15 @@ import net.minecraft.client.render.Tessellator
 import net.minecraft.client.render.VertexFormat
 import net.minecraft.client.render.VertexFormats
 import net.minecraft.client.util.math.MatrixStack
+import net.minecraft.client.util.math.MatrixStack.Entry
 import net.minecraft.util.math.BlockPos
 import net.minecraft.util.math.Vec3d
 
-class RenderInWorldContext private constructor(private val tesselator: Tessellator, private val matrixStack: MatrixStack) {
+class RenderInWorldContext private constructor(
+    private val tesselator: Tessellator,
+    private val matrixStack: MatrixStack,
+    private val camera: Camera
+) {
     private val buffer = tesselator.buffer
 
     fun color(red: Float, green: Float, blue: Float, alpha: Float) {
@@ -39,6 +46,7 @@ class RenderInWorldContext private constructor(private val tesselator: Tessellat
     }
 
     fun block(blockPos: BlockPos) {
+        RenderSystem.setShader(GameRenderer::getPositionColorProgram)
         matrixStack.push()
         matrixStack.translate(blockPos.x.toFloat(), blockPos.y.toFloat(), blockPos.z.toFloat())
         buildCube(matrixStack.peek().positionMatrix, buffer)
@@ -47,6 +55,7 @@ class RenderInWorldContext private constructor(private val tesselator: Tessellat
     }
 
     fun tinyBlock(vec3d: Vec3d, size: Float) {
+        RenderSystem.setShader(GameRenderer::getPositionColorProgram)
         matrixStack.push()
         matrixStack.translate(vec3d.x, vec3d.y, vec3d.z)
         matrixStack.scale(size, size, size)
@@ -56,11 +65,56 @@ class RenderInWorldContext private constructor(private val tesselator: Tessellat
         matrixStack.pop()
     }
 
-    fun line(vararg points: Vec3d, size: Double = 2.0) {
+    fun wireframeCube(blockPos: BlockPos, lineWidth: Float = 10F) {
+        RenderSystem.setShader(GameRenderer::getRenderTypeLinesProgram)
+        matrixStack.push()
+        RenderSystem.lineWidth(lineWidth / pow(camera.pos.squaredDistanceTo(blockPos.toCenterPos()), 0.25).toFloat())
+        matrixStack.translate(blockPos.x.toFloat(), blockPos.y.toFloat(), blockPos.z.toFloat())
+        buildWireFrameCube(matrixStack.peek(), buffer)
+        tesselator.draw()
+        matrixStack.pop()
+    }
 
+    fun line(vararg points: Vec3d, lineWidth: Float = 10F) {
+        RenderSystem.setShader(GameRenderer::getRenderTypeLinesProgram)
+        RenderSystem.lineWidth(lineWidth / pow(camera.pos.squaredDistanceTo(points.first()), 0.25).toFloat())
+        buffer.begin(VertexFormat.DrawMode.LINES, VertexFormats.LINES)
+        buffer.fixedColor(255, 255, 255, 255)
+
+        points.toList().zipWithNext().forEach { (a, b) ->
+            doLine(matrixStack.peek(), buffer, a.x, a.y, a.z, b.x, b.y, b.z)
+        }
+        buffer.unfixColor()
+
+        tesselator.draw()
     }
 
     companion object {
+        private fun doLine(matrix: Entry, buf: BufferBuilder, i: Number, j: Number, k: Number, x: Number, y: Number, z: Number) {
+            val normal = Vector3f(x.toFloat(), y.toFloat(), z.toFloat())
+                .sub(i.toFloat(), j.toFloat(), k.toFloat())
+                .mul(-1F)
+            buf.vertex(matrix.positionMatrix, i.toFloat(), j.toFloat(), k.toFloat())
+                .normal(matrix.normalMatrix, normal.x, normal.y, normal.z).next()
+            buf.vertex(matrix.positionMatrix, x.toFloat(), y.toFloat(), z.toFloat())
+                .normal(matrix.normalMatrix, normal.x, normal.y, normal.z).next()
+        }
+
+
+        private fun buildWireFrameCube(matrix: MatrixStack.Entry, buf: BufferBuilder) {
+            buf.begin(VertexFormat.DrawMode.LINES, VertexFormats.LINES)
+            buf.fixedColor(255, 255, 255, 255)
+
+            for (i in 0..1) {
+                for (j in 0..1) {
+                    doLine(matrix, buf, 0, i, j, 1, i, j)
+                    doLine(matrix, buf, i, 0, j, i, 1, j)
+                    doLine(matrix, buf, i, j, 0, i, j, 1)
+                }
+            }
+            buf.unfixColor()
+        }
+
         private fun buildCube(matrix: Matrix4f, buf: BufferBuilder) {
             buf.begin(VertexFormat.DrawMode.TRIANGLES, VertexFormats.POSITION_COLOR)
             buf.fixedColor(255, 255, 255, 255)
@@ -107,19 +161,21 @@ class RenderInWorldContext private constructor(private val tesselator: Tessellat
             RenderSystem.disableDepthTest()
             RenderSystem.enableBlend()
             RenderSystem.defaultBlendFunc()
-            RenderSystem.setShader(GameRenderer::getPositionColorProgram)
+            RenderSystem.disableCull()
 
             matrices.push()
             matrices.translate(-camera.pos.x, -camera.pos.y, -camera.pos.z)
 
-            val ctx = RenderInWorldContext(Tessellator.getInstance(), matrices)
+            val ctx = RenderInWorldContext(RenderSystem.renderThreadTesselator(), matrices, camera)
+
             block(ctx)
 
             matrices.pop()
 
-            RenderSystem.setShaderColor(1F,1F,1F,1F)
+            RenderSystem.setShaderColor(1F, 1F, 1F, 1F)
             VertexBuffer.unbind()
             RenderSystem.enableDepthTest()
+            RenderSystem.enableCull()
             RenderSystem.disableBlend()
         }
     }