public static Shader bakeShader(ShaderLayer shaderLayer, TextureRecipe recipe)
{
TextAsset shaderBaseText = (TextAsset)Resources.Load("template.shader");
if (shaderBaseText == null)
{
Debug.LogError("Failed to template shader");
return(null);
}
string shaderName = ShaderLayer.getShaderName(recipe, shaderLayer);
string shaderPath = ShaderLayer.getShaderPath(recipe, shaderLayer);
string shaderText = shaderBaseText.text;
List <string> lines = shaderText.Split('\n').ToList <string>();
int numLines = lines.Count;
for (int i = 0; i < numLines; i++)
{
string line = lines[i];
if (line.Contains("$$"))
{
if (line.Contains("$$ASSETNAME"))
{
line = line.Replace("$$ASSETNAME", shaderPath);
lines[i] = line;
}
else if (line.Contains("$$STARTFUNCS"))
{
var funcs = getFunctions(shaderLayer);
lines.InsertRange(i + 1, funcs);
i += funcs.Count;
numLines = lines.Count;
}
else if (line.Contains("$$STARTPROPS"))
{
var props = getProperties(shaderLayer);
lines.InsertRange(i + 1, props);
i += props.Count;
numLines = lines.Count;
}
else if (line.Contains("$$STARTINPUTS"))
{
var inputs = getInputs(shaderLayer);
lines.InsertRange(i + 1, inputs);
i += inputs.Count;
numLines = lines.Count;
}
else if (line.Contains("$$STARTSHADER"))
{
lines.Insert(i + 1, getCalls(shaderLayer));
numLines = lines.Count;
i++;
}
}
}
string baseAssetPath = "Assets/TextureRecipes/Resources/";
string shaderAssetPath = baseAssetPath + shaderName + ".shader";
//Can't do this because we want to overwrite an existing asset! shaderPath = AssetDatabase.GenerateUniqueAssetPath(shaderPath);
//Generating the text for the shader is a very fast operation. Rather than trying to figure out which changes
//would have altered the shader, we simply generate the shader as a byproduct of every change, and then see
//if it has changed since the last time we output it. The really expensive part is outputting the shader and
//triggering the Unity shader post-process and compilation steps (we're talking >1.5s vs 3ms).
string[] existingLines = null;
existingShaderLines.TryGetValue(shaderPath, out existingLines);
string[] newLines = lines.ToArray();
if (existingLines != null)
{
if (existingLines.Length == newLines.Length)
{
bool allMatch = true;
for (int i = 0; allMatch && (i < newLines.Length); i++)
{
if (existingLines[i] != newLines[i])
{
allMatch = false;
}
}
if (allMatch)
{
return(Shader.Find(shaderPath));
}
}
}
//File.WriteAllLines(shaderAssetPath, newLines);
using (StreamWriter writer = new StreamWriter(shaderAssetPath, false))
{
writer.NewLine = "\n";
foreach (string str in newLines)
{
writer.WriteLine(str);
}
}
existingShaderLines[shaderPath] = newLines;
AssetDatabase.Refresh();
return(Shader.Find(shaderPath));
}
