public static Texture2D BuildPreviewTexture(int width, int height, Sprite sprite, Material spriteRendererMaterial, bool isPolygon)
{
if (!ShaderUtil.hardwareSupportsRectRenderTexture)
{
return(null);
}
float num = sprite.rect.width;
float num2 = sprite.rect.height;
Texture2D spriteTexture = SpriteUtility.GetSpriteTexture(sprite, false);
if (!isPolygon)
{
PreviewHelpers.AdjustWidthAndHeightForStaticPreview((int)num, (int)num2, ref width, ref height);
}
SavedRenderTargetState state = new SavedRenderTargetState();
RenderTexture temp = RenderTexture.GetTemporary(width, height, 0, RenderTextureFormat.Default, RenderTextureReadWrite.Default);
RenderTexture.active = temp;
GL.sRGBWrite = QualitySettings.activeColorSpace == ColorSpace.Linear;
GL.Clear(true, true, new Color(0f, 0f, 0f, 0f));
Texture texture = null;
Vector4 vector = new Vector4(0f, 0f, 0f, 0f);
bool flag = false;
bool flag2 = false;
if (spriteRendererMaterial != null)
{
flag = spriteRendererMaterial.HasProperty("_MainTex");
flag2 = spriteRendererMaterial.HasProperty("_MainTex_TexelSize");
}
Material material = null;
if (spriteRendererMaterial != null)
{
if (flag)
{
texture = spriteRendererMaterial.GetTexture("_MainTex");
spriteRendererMaterial.SetTexture("_MainTex", spriteTexture);
}
if (flag2)
{
vector = spriteRendererMaterial.GetVector("_MainTex_TexelSize");
spriteRendererMaterial.SetVector("_MainTex_TexelSize", TextureUtil.GetTexelSizeVector(spriteTexture));
}
spriteRendererMaterial.SetPass(0);
}
else
{
material = new Material(Shader.Find("Hidden/BlitCopy"))
{
mainTexture = spriteTexture,
mainTextureScale = Vector2.one,
mainTextureOffset = Vector2.zero
};
material.SetPass(0);
}
float num3 = sprite.rect.width / sprite.bounds.size.x;
Vector2[] vertices = sprite.vertices;
Vector2[] uv = sprite.uv;
ushort[] triangles = sprite.triangles;
Vector2 pivot = sprite.pivot;
GL.PushMatrix();
GL.LoadOrtho();
GL.Color(new Color(1f, 1f, 1f, 1f));
GL.Begin(4);
for (int i = 0; i < sprite.triangles.Length; i++)
{
ushort index = triangles[i];
Vector2 vector3 = vertices[index];
Vector2 vector4 = uv[index];
GL.TexCoord(new Vector3(vector4.x, vector4.y, 0f));
GL.Vertex3(((vector3.x * num3) + pivot.x) / num, ((vector3.y * num3) + pivot.y) / num2, 0f);
}
GL.End();
GL.PopMatrix();
GL.sRGBWrite = false;
if (spriteRendererMaterial != null)
{
if (flag)
{
spriteRendererMaterial.SetTexture("_MainTex", texture);
}
if (flag2)
{
spriteRendererMaterial.SetVector("_MainTex_TexelSize", vector);
}
}
Texture2D textured2 = new Texture2D(width, height, TextureFormat.ARGB32, false)
{
hideFlags = HideFlags.HideAndDontSave
};
textured2.ReadPixels(new Rect(0f, 0f, (float)width, (float)height), 0, 0);
textured2.Apply();
RenderTexture.ReleaseTemporary(temp);
state.Restore();
if (material != null)
{
Object.DestroyImmediate(material);
}
return(textured2);
}