1 files changed, 101 insertions, 0 deletions
diff --git a/src/main/kotlin/util/render/FacingThePlayerContext.kt b/src/main/kotlin/util/render/FacingThePlayerContext.kt
new file mode 100644
index 0000000..eb37e35
--- /dev/null
+++ b/src/main/kotlin/util/render/FacingThePlayerContext.kt
@@ -0,0 +1,101 @@
+
+package moe.nea.firmament.util.render
+
+import com.mojang.blaze3d.systems.RenderSystem
+import io.github.notenoughupdates.moulconfig.platform.next
+import org.joml.Matrix4f
+import net.minecraft.client.font.TextRenderer
+import net.minecraft.client.render.BufferRenderer
+import net.minecraft.client.render.GameRenderer
+import net.minecraft.client.render.LightmapTextureManager
+import net.minecraft.client.render.RenderLayer
+import net.minecraft.client.render.Tessellator
+import net.minecraft.client.render.VertexConsumer
+import net.minecraft.client.render.VertexFormat
+import net.minecraft.client.render.VertexFormats
+import net.minecraft.text.Text
+import net.minecraft.util.Identifier
+import net.minecraft.util.math.BlockPos
+import moe.nea.firmament.util.FirmFormatters
+import moe.nea.firmament.util.MC
+import moe.nea.firmament.util.assertTrueOr
+
+@RenderContextDSL
+class FacingThePlayerContext(val worldContext: RenderInWorldContext) {
+    val matrixStack by worldContext::matrixStack
+    fun waypoint(position: BlockPos, label: Text) {
+        text(
+            label,
+            Text.literal("§e${FirmFormatters.formatDistance(MC.player?.pos?.distanceTo(position.toCenterPos()) ?: 42069.0)}")
+        )
+    }
+
+    fun text(
+        vararg texts: Text,
+        verticalAlign: RenderInWorldContext.VerticalAlign = RenderInWorldContext.VerticalAlign.CENTER,
+        background: Int = 0x70808080,
+    ) {
+        assertTrueOr(texts.isNotEmpty()) { return@text }
+        for ((index, text) in texts.withIndex()) {
+            worldContext.matrixStack.push()
+            val width = MC.font.getWidth(text)
+            worldContext.matrixStack.translate(-width / 2F, verticalAlign.align(index, texts.size), 0F)
+            val vertexConsumer: VertexConsumer =
+                worldContext.vertexConsumers.getBuffer(RenderLayer.getTextBackgroundSeeThrough())
+            val matrix4f = worldContext.matrixStack.peek().positionMatrix
+            vertexConsumer.vertex(matrix4f, -1.0f, -1.0f, 0.0f).color(background)
+                .light(LightmapTextureManager.MAX_BLOCK_LIGHT_COORDINATE).next()
+            vertexConsumer.vertex(matrix4f, -1.0f, MC.font.fontHeight.toFloat(), 0.0f).color(background)
+                .light(LightmapTextureManager.MAX_BLOCK_LIGHT_COORDINATE).next()
+            vertexConsumer.vertex(matrix4f, width.toFloat(), MC.font.fontHeight.toFloat(), 0.0f)
+                .color(background)
+                .light(LightmapTextureManager.MAX_BLOCK_LIGHT_COORDINATE).next()
+            vertexConsumer.vertex(matrix4f, width.toFloat(), -1.0f, 0.0f).color(background)
+                .light(LightmapTextureManager.MAX_BLOCK_LIGHT_COORDINATE).next()
+            worldContext.matrixStack.translate(0F, 0F, 0.01F)
+
+            MC.font.draw(
+                text,
+                0F,
+                0F,
+                -1,
+                false,
+                worldContext.matrixStack.peek().positionMatrix,
+                worldContext.vertexConsumers,
+                TextRenderer.TextLayerType.SEE_THROUGH,
+                0,
+                LightmapTextureManager.MAX_LIGHT_COORDINATE
+            )
+            worldContext.matrixStack.pop()
+        }
+    }
+
+
+    fun texture(
+        texture: Identifier, width: Int, height: Int,
+        u1: Float, v1: Float,
+        u2: Float, v2: Float,
+    ) {
+        RenderSystem.setShaderTexture(0, texture)
+        RenderSystem.setShader(GameRenderer::getPositionTexColorProgram)
+        val hw = width / 2F
+        val hh = height / 2F
+        val matrix4f: Matrix4f = worldContext.matrixStack.peek().positionMatrix
+        val buf = Tessellator.getInstance()
+            .begin(VertexFormat.DrawMode.QUADS, VertexFormats.POSITION_TEXTURE_COLOR)
+        buf.vertex(matrix4f, -hw, -hh, 0F)
+            .color(-1)
+            .texture(u1, v1).next()
+        buf.vertex(matrix4f, -hw, +hh, 0F)
+            .color(-1)
+            .texture(u1, v2).next()
+        buf.vertex(matrix4f, +hw, +hh, 0F)
+            .color(-1)
+            .texture(u2, v2).next()
+        buf.vertex(matrix4f, +hw, -hh, 0F)
+            .color(-1)
+            .texture(u2, v1).next()
+        BufferRenderer.drawWithGlobalProgram(buf.end())
+    }
+
+}