/// <summary>
/// Updates the preview texture for this editor.
/// </summary>
/// <param name="regenerateShader">
/// If true, regenerates the graph's shader, which takes a lot longer.
/// This should be true whenever the graph itself changes.
/// </param>
private void UpdatePreview(bool regenerateShader = true)
{
//Update params.
var oldParams = graphParams;
graphParams = new GPUGraph.GraphParamCollection(graph);
graphParams.SetParams(oldParams);
//Create shader.
if (regenerateShader || cachedPreviewMat == null)
{
string shaderText = graph.GenerateShader("Graph editor temp shader", "rgb", 1.0f);
Shader shader = ShaderUtil.CreateShaderAsset(shaderText);
if (shader == null)
{
Debug.LogError("Shader: " + shaderText);
}
else
{
cachedPreviewMat = new Material(shader);
}
}
//Create texture.
if (previewNoise == null)
{
previewNoise = new Texture2D(256, 256, TextureFormat.RGBA32, false);
}
//Set params and generate.
graphParams.SetParams(cachedPreviewMat);
cachedPreviewMat.SetFloat(GraphUtils.Param_UVz, uvZ);
GraphUtils.GenerateToTexture(cachedPreviewMat, previewNoise, true);
}
/// <summary>
/// Properly updates the preview texture for this window.
/// Returns it in case anybody wants it (returns null if there was a problem loading the graph).
/// </summary>
public Texture2D GetPreview(bool regenerateShader)
{
//Regenerate shader.
if (regenerateShader || previewMat == null)
{
//Render the gradient ramp to a texture.
Gradient gradient = MakeGradient();
Texture2D myRamp = new Texture2D(1024, 1, TextureFormat.RGBA32, false);
myRamp.wrapMode = TextureWrapMode.Clamp;
Color[] cols = new Color[myRamp.width];
for (int i = 0; i < cols.Length; ++i)
{
cols[i] = gradient.Evaluate((float)i / (float)(cols.Length - 1));
}
myRamp.SetPixels(cols);
myRamp.Apply(false, true);
Graph graph = new Graph(graphPaths[SelectedGraphIndex]);
string errMsg = graph.Load();
if (errMsg.Length > 0)
{
Debug.LogError("Error loading graph " + graphPaths[SelectedGraphIndex] +
": " + errMsg);
return(null);
}
Shader shader = ShaderUtil.CreateShaderAsset(graph.GenerateShader(
"Graph editor temp shader",
"_textureGeneratorWindowGradient"));
previewMat = new Material(shader);
previewMat.SetTexture("_textureGeneratorWindowGradient", myRamp);
}
//Set parameters.
gParams.SetParams(previewMat);
previewMat.SetFloat(GraphUtils.Param_UVz, previewUVz);
//Generate.
GeneratePreview(ref previewTex, previewMat);
return(previewTex);
}