public override void OnPreviewGUI(Rect r, GUIStyle background)
{
if (Event.current.type == EventType.Repaint)
{
background.Draw(r, false, false, false, false);
}
// show texture
Texture t = target as Texture;
if (t == null) // texture might be gone by now, in case this code is used for floating texture preview
{
return;
}
GraphicsFormat format = t.graphicsFormat;
if (!(GraphicsFormatUtility.IsIEEE754Format(format) || GraphicsFormatUtility.IsNormFormat(format)))
{
EditorGUI.HelpBox(r, "This preview only supports floating point or normalized formats.", MessageType.Warning);
return;
}
// Render target must be created before we can display it (case 491797)
RenderTexture rt = t as RenderTexture;
if (rt != null)
{
if (rt.Create() == false)
{
return;
}
}
if (IsCubemap())
{
m_CubemapPreview.OnPreviewGUI(t, r, background, GetExposureValueForTexture(t));
return;
}
if (IsTexture3D())
{
m_Texture3DPreview.Texture = t;
m_Texture3DPreview.OnPreviewGUI(r, background);
return;
}
if (IsTexture2DArray())
{
m_Texture2DArrayPreview.OnPreviewGUI(t, r, background, GetExposureValueForTexture(t), m_PreviewMode, m_MipLevel);
return;
}
// target can report zero sizes in some cases just after a parameter change;
// guard against that.
int texWidth = Mathf.Max(t.width, 1);
int texHeight = Mathf.Max(t.height, 1);
float mipLevel = GetMipLevelForRendering();
float zoomLevel = Mathf.Min(Mathf.Min(r.width / texWidth, r.height / texHeight), 1);
Rect wantedRect = new Rect(r.x, r.y, texWidth * zoomLevel, texHeight * zoomLevel);
PreviewGUI.BeginScrollView(r, m_Pos, wantedRect, "PreHorizontalScrollbar", "PreHorizontalScrollbarThumb");
FilterMode oldFilter = t.filterMode;
TextureUtil.SetFilterModeNoDirty(t, FilterMode.Point);
Texture2D t2d = t as Texture2D;
ColorWriteMask colorWriteMask = ColorWriteMask.All;
switch (m_PreviewMode)
{
case PreviewMode.R:
colorWriteMask = ColorWriteMask.Red | ColorWriteMask.Alpha;
break;
case PreviewMode.G:
colorWriteMask = ColorWriteMask.Green | ColorWriteMask.Alpha;
break;
case PreviewMode.B:
colorWriteMask = ColorWriteMask.Blue | ColorWriteMask.Alpha;
break;
}
if (m_PreviewMode == PreviewMode.A)
{
EditorGUI.DrawTextureAlpha(wantedRect, t, ScaleMode.StretchToFill, 0, mipLevel);
}
else
{
if (t2d != null && t2d.alphaIsTransparency)
{
EditorGUI.DrawTextureTransparent(wantedRect, t, ScaleMode.StretchToFill, 0, mipLevel,
colorWriteMask, GetExposureValueForTexture(t));
}
else
{
EditorGUI.DrawPreviewTexture(wantedRect, t, null, ScaleMode.StretchToFill, 0, mipLevel,
colorWriteMask, GetExposureValueForTexture(t));
}
}
// TODO: Less hacky way to prevent sprite rects to not appear in smaller previews like icons.
if ((wantedRect.width > 32 && wantedRect.height > 32) && Event.current.type == EventType.Repaint)
{
string path = AssetDatabase.GetAssetPath(t);
TextureImporter textureImporter = AssetImporter.GetAtPath(path) as TextureImporter;
SpriteMetaData[] spritesheet = textureImporter != null?textureImporter.GetSpriteMetaDatas() : null;
if (spritesheet != null && textureImporter.spriteImportMode == SpriteImportMode.Multiple)
{
Rect screenRect = new Rect();
Rect sourceRect = new Rect();
GUI.CalculateScaledTextureRects(wantedRect, ScaleMode.StretchToFill, (float)t.width / (float)t.height, ref screenRect, ref sourceRect);
int origWidth = t.width;
int origHeight = t.height;
textureImporter.GetWidthAndHeight(ref origWidth, ref origHeight);
float definitionScale = (float)t.width / (float)origWidth;
HandleUtility.ApplyWireMaterial();
GL.PushMatrix();
GL.MultMatrix(Handles.matrix);
GL.Begin(GL.LINES);
GL.Color(new Color(1f, 1f, 1f, 0.5f));
foreach (SpriteMetaData sprite in spritesheet)
{
Rect spriteRect = sprite.rect;
Rect spriteScreenRect = new Rect();
spriteScreenRect.xMin = screenRect.xMin + screenRect.width * (spriteRect.xMin / t.width * definitionScale);
spriteScreenRect.xMax = screenRect.xMin + screenRect.width * (spriteRect.xMax / t.width * definitionScale);
spriteScreenRect.yMin = screenRect.yMin + screenRect.height * (1f - spriteRect.yMin / t.height * definitionScale);
spriteScreenRect.yMax = screenRect.yMin + screenRect.height * (1f - spriteRect.yMax / t.height * definitionScale);
DrawRect(spriteScreenRect);
}
GL.End();
GL.PopMatrix();
}
}
TextureUtil.SetFilterModeNoDirty(t, oldFilter);
m_Pos = PreviewGUI.EndScrollView();
if (mipLevel != 0)
{
EditorGUI.DropShadowLabel(new Rect(r.x, r.y, r.width, 20), "Mip " + mipLevel);
}
}
