protected UvTransform?TextureRotationSlider(
Material material,
UvTransform?uvTransform,
int scaleTransformPropertyId,
int rotationPropertyId,
bool freezeScale = false
)
{
UvTransform oldUvTransform;
UvTransform newUvTransform;
if (uvTransform.HasValue)
{
oldUvTransform = uvTransform.Value;
newUvTransform = uvTransform.Value;
}
else
{
GetUvTransform(material, scaleTransformPropertyId, rotationPropertyId, out oldUvTransform);
newUvTransform = new UvTransform();
}
GUILayout.BeginHorizontal();
GUILayout.Label("Texture Rotation");
var newUvRotation = EditorGUILayout.Slider(oldUvTransform.rotation, 0, 360);
GUILayout.EndHorizontal();
float2 newUvScale = new float2(1, 1);
if (!freezeScale)
{
GUILayout.BeginHorizontal();
newUvScale = EditorGUILayout.Vector2Field("Scale", oldUvTransform.scale);
GUILayout.EndHorizontal();
}
if (!uvTransform.HasValue)
{
newUvTransform.rotation = newUvRotation;
newUvTransform.scale = newUvScale;
}
bool update = false;
if (Math.Abs(newUvRotation - oldUvTransform.rotation) > TOLERANCE)
{
newUvTransform.rotation = newUvRotation;
update = true;
}
if (!freezeScale && !newUvScale.Equals(oldUvTransform.scale))
{
newUvTransform.scale = newUvScale;
update = true;
}
if (update)
{
var cos = math.cos(newUvTransform.rotation * Mathf.Deg2Rad);
var sin = math.sin(newUvTransform.rotation * Mathf.Deg2Rad);
var currentScaleTransform = material.GetVector(scaleTransformPropertyId);
float2x2 rotScale = math.mul(new float2x2(cos, sin, -sin, cos), new float2x2(newUvTransform.scale.x, 0, 0, newUvTransform.scale.y));
material.SetVector(scaleTransformPropertyId, new Vector4(rotScale.c0.x, rotScale.c1.y, currentScaleTransform.z, currentScaleTransform.w));
material.SetVector(rotationPropertyId, new Vector4(rotScale.c1.x, rotScale.c0.y, 0, 0));
if (newUvTransform.rotation == 0)
{
material.DisableKeyword(KW_UV_ROTATION);
}
else
{
material.EnableKeyword(KW_UV_ROTATION);
}
return(newUvTransform);
}
return(uvTransform);
}
/// <summary>
/// Extracts a material's texture rotation (degrees) from the 2 by 2 matrix
/// </summary>
/// <param name="material"></param>
/// <returns>texture rotation in degrees</returns>
static void GetUvTransform(Material material, int scaleTransformPropertyId, int rotationPropertyId, out UvTransform uvTransform)
{
float4 st = material.GetVector(scaleTransformPropertyId);
float2 r = (Vector2)material.GetVector(rotationPropertyId);
uvTransform.scale.x = Mathematics.normalize(new float2(st.x, r.y), out var r1);
uvTransform.scale.y = Mathematics.normalize(new float2(st.y, r.x), out var r2);
var acos = Mathf.Acos(r1.x);
if (r2.x < 0)
{
acos = Mathf.PI * 2 - acos;
}
uvTransform.rotation = acos * Mathf.Rad2Deg;
}