From 82871ba1bac1d62f69e1933b66659e62d2e5e063 Mon Sep 17 00:00:00 2001
From: Arda Serdar Pektezol <1669855+pektezol@users.noreply.github.com>
Date: Tue, 12 Sep 2023 20:53:09 +0300
Subject: another rewrite, v1.0.0

---
 pkg/messages/types/svcBspDecal.go | 61 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 pkg/messages/types/svcBspDecal.go

(limited to 'pkg/messages/types/svcBspDecal.go')

diff --git a/pkg/messages/types/svcBspDecal.go b/pkg/messages/types/svcBspDecal.go
new file mode 100644
index 0000000..484497f
--- /dev/null
+++ b/pkg/messages/types/svcBspDecal.go
@@ -0,0 +1,61 @@
+package messages
+
+import (
+	"github.com/pektezol/bitreader"
+)
+
+type SvcBspDecal struct {
+	Pos               []vectorCoord
+	DecalTextureIndex int16
+	EntityIndex       int16
+	ModelIndex        int16
+	LowPriority       int8
+}
+
+type vectorCoord struct {
+	Value float32
+	Valid bool
+}
+
+func ParseSvcBspDecal(reader *bitreader.ReaderType) SvcBspDecal {
+	svcBspDecal := SvcBspDecal{
+		Pos:               readVectorCoords(reader),
+		DecalTextureIndex: int16(reader.TryReadBits(9)),
+	}
+	if reader.TryReadBool() {
+		svcBspDecal.EntityIndex = int16(reader.TryReadBits(11))
+		svcBspDecal.ModelIndex = int16(reader.TryReadBits(11))
+	}
+	svcBspDecal.LowPriority = int8(reader.TryReadBits(1))
+	return svcBspDecal
+}
+
+func readVectorCoords(reader *bitreader.ReaderType) []vectorCoord {
+	const COORD_INTEGER_BITS uint8 = 14
+	const COORD_FRACTIONAL_BITS uint8 = 5
+	const COORD_DENOMINATOR uint8 = 1 << COORD_FRACTIONAL_BITS
+	const COORD_RESOLUTION float32 = 1.0 / float32(COORD_DENOMINATOR)
+	readVectorCoord := func() float32 {
+		value := float32(0)
+		integer := reader.TryReadBits(1)
+		fraction := reader.TryReadBits(1)
+		if integer != 0 || fraction != 0 {
+			sign := reader.TryReadBits(1)
+			if integer != 0 {
+				integer = reader.TryReadBits(int(COORD_INTEGER_BITS)) + 1
+			}
+			if fraction != 0 {
+				fraction = reader.TryReadBits(int(COORD_FRACTIONAL_BITS))
+			}
+			value = float32(integer) + float32(fraction)*COORD_RESOLUTION
+			if sign != 0 {
+				value = -value
+			}
+		}
+		return value
+	}
+	x := reader.TryReadBits(1)
+	y := reader.TryReadBits(1)
+	z := reader.TryReadBits(1)
+	return []vectorCoord{{Value: readVectorCoord(), Valid: x != 0}, {Value: readVectorCoord(), Valid: y != 0}, {Value: readVectorCoord(), Valid: z != 0}}
+}
-- 
cgit v1.2.3