247 lines
9.7 KiB
C#
247 lines
9.7 KiB
C#
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using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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namespace BrainFailProductions.PolyFew.AsImpL
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{
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/// <summary>
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/// Utility class for model import
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/// </summary>
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public class ModelUtil
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{
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/// <summary>
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/// Blend mode for Unity Material
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/// </summary>
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public enum MtlBlendMode { OPAQUE, CUTOUT, FADE, TRANSPARENT }
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/// <summary>
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/// Set up a Material for the given mode.
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/// </summary>
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/// <remarks>Here is replicated what is done when choosing a blend mode from Inspector.</remarks>
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/// <param name="mtl">material to be changed</param>
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/// <param name="mode">mode to be set</param>
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public static void SetupMaterialWithBlendMode(Material mtl, MtlBlendMode mode)
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{
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switch (mode)
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{
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case MtlBlendMode.OPAQUE:
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mtl.SetOverrideTag("RenderType", "Opaque");
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mtl.SetFloat("_Mode", 0);
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mtl.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One);
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mtl.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.Zero);
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mtl.SetInt("_ZWrite", 1);
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mtl.DisableKeyword("_ALPHATEST_ON");
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mtl.DisableKeyword("_ALPHABLEND_ON");
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mtl.DisableKeyword("_ALPHAPREMULTIPLY_ON");
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mtl.renderQueue = -1;
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break;
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case MtlBlendMode.CUTOUT:
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mtl.SetOverrideTag("RenderType", "TransparentCutout");
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mtl.SetFloat("_Mode", 1);
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mtl.SetFloat("_Mode", 1);
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mtl.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One);
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mtl.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.Zero);
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mtl.SetInt("_ZWrite", 1);
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mtl.EnableKeyword("_ALPHATEST_ON");
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mtl.DisableKeyword("_ALPHABLEND_ON");
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mtl.DisableKeyword("_ALPHAPREMULTIPLY_ON");
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mtl.renderQueue = 2450;
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break;
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case MtlBlendMode.FADE:
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mtl.SetOverrideTag("RenderType", "Transparent");
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mtl.SetFloat("_Mode", 2);
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mtl.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.SrcAlpha);
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mtl.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha);
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mtl.SetInt("_ZWrite", 0);
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mtl.DisableKeyword("_ALPHATEST_ON");
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mtl.EnableKeyword("_ALPHABLEND_ON");
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mtl.DisableKeyword("_ALPHAPREMULTIPLY_ON");
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mtl.renderQueue = 3000;
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break;
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case MtlBlendMode.TRANSPARENT:
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mtl.SetOverrideTag("RenderType", "Transparent");
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mtl.SetFloat("_Mode", 3);
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mtl.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One);
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mtl.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha);
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mtl.SetInt("_ZWrite", 0);
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mtl.DisableKeyword("_ALPHATEST_ON");
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mtl.DisableKeyword("_ALPHABLEND_ON");
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mtl.EnableKeyword("_ALPHAPREMULTIPLY_ON");
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mtl.renderQueue = 3000;
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break;
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}
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}
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/// <summary>
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/// Scan a texture looking for transparent pixels and trying to guess the correct blend mode needed.
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/// </summary>
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/// <param name="texture">input rexture (it must be set to readable)</param>
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/// <param name="mode">blend mode set to FADE or CUTOUT if transparent pixels are found.</param>
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/// <returns>Return true if transparent pixels were found.</returns>
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public static bool ScanTransparentPixels(Texture2D texture, ref MtlBlendMode mode)
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{
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bool texCanBeTransparent = texture != null
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&& (texture.format == TextureFormat.ARGB32
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|| texture.format == TextureFormat.RGBA32
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|| texture.format == TextureFormat.DXT5
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|| texture.format == TextureFormat.ARGB4444
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|| texture.format == TextureFormat.BGRA32
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// Only for DirectX support
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#if UNITY_STANDALONE_WIN
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|| texture.format == TextureFormat.DXT5Crunched
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#endif
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//|| texture.format == ... (all alpha formats)
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);
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if (texCanBeTransparent)
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{
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bool stop = false;
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int pixelScanFrequency = 1;
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for (int x = 0; x < texture.width && !stop; x += pixelScanFrequency)
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{
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for (int y = 0; y < texture.height && !stop; y += pixelScanFrequency)
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{
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float a = texture.GetPixel(x, y).a;
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DetectMtlBlendFadeOrCutout(a, ref mode, ref stop);
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if (stop)
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{
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return mode == MtlBlendMode.FADE || mode == MtlBlendMode.CUTOUT;
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}
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}
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}
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}
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return mode == MtlBlendMode.FADE || mode == MtlBlendMode.CUTOUT;
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}
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/// <summary>
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/// Detect if the blend mode must be set to FADE or CUTOUT
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/// according to the given alpha value and the current value of mode.
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/// </summary>
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/// <param name="alpha">input alpha value</param>
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/// <param name="mode">blend mode set to FADE or CUTOUT</param>
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/// <param name="noDoubt">flag set to true if the mode is finally detected (it can be used to break from a scan loop)</param>
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public static void DetectMtlBlendFadeOrCutout(float alpha, ref MtlBlendMode mode, ref bool noDoubt)
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{
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if (noDoubt)
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{
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return;
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}
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if (alpha < 1.0f)
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{
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//mode = MtlBlendMode.TRANSPARENT;
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if (alpha == 0.0f)
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{
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// assume there is a "cutout texture"
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mode = MtlBlendMode.CUTOUT;
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} // else 0<alpha<1
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else if (mode != MtlBlendMode.FADE)
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{
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// assume there is a "fade texture"
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mode = MtlBlendMode.FADE;
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noDoubt = true;
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}
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}
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}
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/// <summary>
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/// Convert a bump map to a normal map
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/// </summary>
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/// <param name="bumpMap">input bump map</param>
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/// <param name="amount">optionally adjust the bump effect with the normal map</param>
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/// <returns>The new normal map</returns>
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public static Texture2D HeightToNormalMap(Texture2D bumpMap, float amount = 1f)
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{
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int h = bumpMap.height;
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int w = bumpMap.width;
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float changeNeg, changePos;
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float /*h0,*/ h1, h2, h3/*, h4*/;
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Texture2D normalMap = new Texture2D(w, h, TextureFormat.ARGB32, true);
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Color col = Color.black;
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for (int y = 0; y < bumpMap.height; y++)
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{
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for (int x = 0; x < bumpMap.width; x++)
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{
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Vector3 n = Vector3.zero;
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// CHANGE IN X
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//h0 = height_map.GetPixel( WrapInt(x-2, w),y).grayscale;
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h1 = bumpMap.GetPixel(WrapInt(x - 1, w), y).grayscale;
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h2 = bumpMap.GetPixel(x, y).grayscale;
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h3 = bumpMap.GetPixel(WrapInt(x + 1, w), y).grayscale;
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//h4 = height_map.GetPixel(WrapInt(x+2, w) , y).grayscale;
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//changeNeg = 0.7f*(h1 - h0)+0.2f*(h2 - h1);
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//changePos = 0.2f*(h3 - h2)+0.7f*(h4 - h3);
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changeNeg = h2 - h1;
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changePos = h3 - h2;
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n.x = -(changePos + changeNeg) / 255.0f;
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// CHANGE IN Y
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//h0 = height_map.GetPixel(x, WrapInt(y-2, h)).grayscale;
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h1 = bumpMap.GetPixel(x, WrapInt(y - 1, h)).grayscale;
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h2 = bumpMap.GetPixel(x, y).grayscale;
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h3 = bumpMap.GetPixel(x, WrapInt(y + 1, h)).grayscale;
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//h4 = height_map.GetPixel(x, WrapInt(y+2, h).grayscale);
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//changeNeg = 0.7f*(h1 - h0)+0.2f*(h2 - h1);
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//changePos = 0.2f*(h3 - h2)+0.7f*(h4 - h3);
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changeNeg = h2 - h1;
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changePos = h3 - h2;
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n.y = -(changePos + changeNeg);
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// SCALE OF BUMPINESS
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if (amount != 1.0f) n *= amount;
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/// Get depth component
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n.z = Mathf.Sqrt(1.0f - (n.x * n.x + n.y * n.y));
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// Scale in (0..0.5);
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n *= 0.5f;
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// set the pixel
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col.r = Mathf.Clamp01(n.x + 0.5f);
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col.g = Mathf.Clamp01(n.y + 0.5f);
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col.b = Mathf.Clamp01(n.z + 0.5f);
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col.a = col.r;
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normalMap.SetPixel(x, y, col);
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}
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}
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normalMap.Apply();
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return normalMap;
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}
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/// <summary>
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/// Wrap the given value pos inside the range (0..boundary).
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/// </summary>
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/// <param name="pos">input value</param>
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/// <param name="boundary">range boundary</param>
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/// <returns>the wrapped value</returns>
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private static int WrapInt(int pos, int boundary)
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{
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if (pos < 0)
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pos = boundary + pos;
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else if (pos >= boundary)
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pos -= boundary;
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return pos;
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}
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}
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}
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