1 files changed, 95 insertions, 0 deletions
diff --git a/src/main/kotlin/util/render/RenderCircleProgress.kt b/src/main/kotlin/util/render/RenderCircleProgress.kt
new file mode 100644
index 0000000..a2f42b5
--- /dev/null
+++ b/src/main/kotlin/util/render/RenderCircleProgress.kt
@@ -0,0 +1,95 @@
+
+package moe.nea.firmament.util.render
+
+import com.mojang.blaze3d.systems.RenderSystem
+import io.github.notenoughupdates.moulconfig.platform.next
+import org.joml.Matrix4f
+import org.joml.Vector2f
+import kotlin.math.atan2
+import kotlin.math.tan
+import net.minecraft.client.gui.DrawContext
+import net.minecraft.client.render.BufferRenderer
+import net.minecraft.client.render.GameRenderer
+import net.minecraft.client.render.Tessellator
+import net.minecraft.client.render.VertexFormat.DrawMode
+import net.minecraft.client.render.VertexFormats
+import net.minecraft.util.Identifier
+
+object RenderCircleProgress {
+
+    fun renderCircle(
+        drawContext: DrawContext,
+        texture: Identifier,
+        progress: Float,
+        u1: Float,
+        u2: Float,
+        v1: Float,
+        v2: Float,
+    ) {
+        RenderSystem.setShaderTexture(0, texture)
+        RenderSystem.setShader(GameRenderer::getPositionTexColorProgram)
+        RenderSystem.enableBlend()
+        val matrix: Matrix4f = drawContext.matrices.peek().positionMatrix
+        val bufferBuilder = Tessellator.getInstance().begin(DrawMode.TRIANGLES, VertexFormats.POSITION_TEXTURE_COLOR)
+
+        val corners = listOf(
+            Vector2f(0F, -1F),
+            Vector2f(1F, -1F),
+            Vector2f(1F, 0F),
+            Vector2f(1F, 1F),
+            Vector2f(0F, 1F),
+            Vector2f(-1F, 1F),
+            Vector2f(-1F, 0F),
+            Vector2f(-1F, -1F),
+        )
+
+        for (i in (0 until 8)) {
+            if (progress < i / 8F) {
+                break
+            }
+            val second = corners[(i + 1) % 8]
+            val first = corners[i]
+            if (progress <= (i + 1) / 8F) {
+                val internalProgress = 1 - (progress - i / 8F) * 8F
+                val angle = lerpAngle(
+                    atan2(second.y, second.x),
+                    atan2(first.y, first.x),
+                    internalProgress
+                )
+                if (angle < tau / 8 || angle >= tau * 7 / 8) {
+                    second.set(1F, tan(angle))
+                } else if (angle < tau * 3 / 8) {
+                    second.set(1 / tan(angle), 1F)
+                } else if (angle < tau * 5 / 8) {
+                    second.set(-1F, -tan(angle))
+                } else {
+                    second.set(-1 / tan(angle), -1F)
+                }
+            }
+
+            fun ilerp(f: Float): Float =
+                ilerp(-1f, 1f, f)
+
+            bufferBuilder
+                .vertex(matrix, second.x, second.y, 0F)
+                .texture(lerp(u1, u2, ilerp(second.x)), lerp(v1, v2, ilerp(second.y)))
+                .color(-1)
+                .next()
+            bufferBuilder
+                .vertex(matrix, first.x, first.y, 0F)
+                .texture(lerp(u1, u2, ilerp(first.x)), lerp(v1, v2, ilerp(first.y)))
+                .color(-1)
+                .next()
+            bufferBuilder
+                .vertex(matrix, 0F, 0F, 0F)
+                .texture(lerp(u1, u2, ilerp(0F)), lerp(v1, v2, ilerp(0F)))
+                .color(-1)
+                .next()
+        }
+        BufferRenderer.drawWithGlobalProgram(bufferBuilder.end())
+        RenderSystem.disableBlend()
+    }
+
+
+
+}