/// <summary>
/// Texture 合并管线第 3 步，创建 Atlas 并保存资源
/// </summary>
/// <returns></returns>
internal static void Step3_BuildAndSaveAtlasesAndStoreResults(
TextureCombinePipelineData data,
TextureCombineHandler combiner,
ITextureCombineAtlasPacker packer,
AtlasPackingResult atlasPackingResult,
EditorMethodsInterface textureEditorMethods,
AtlasesAndRects resultAtlasesAndRects)
{
//run the garbage collector to free up as much memory as possible before bake to reduce MissingReferenceException problems
GC.Collect();
Texture2D[] atlases = new Texture2D[data.numAtlases];
//StringBuilder report = GenerateReport(data);
//创建图集
packer.CreateAtlases(data, combiner, atlasPackingResult, atlases, textureEditorMethods);
data.nonTexturePropertyBlender.AdjustNonTextureProperties(data.ResultMaterial, data.texPropertyNames, data.distinctMaterialTextures, textureEditorMethods);
if (data.distinctMaterialTextures.Count > 0)
{
data.distinctMaterialTextures[0].AdjustResultMaterialNonTextureProperties(data.ResultMaterial, data.texPropertyNames);
}
List <MaterialAndUVRect> mat2rect_map = new List <MaterialAndUVRect>();
for (int i = 0; i < data.distinctMaterialTextures.Count; i++)
{
MaterialPropTexturesSet texSet = data.distinctMaterialTextures[i];
List <MatAndTransformToMerged> mats = texSet.matsAndGOs.mats;
Rect allPropsUseSameTiling_encapsulatingSamplingRect;
Rect propsUseDifferntTiling_obUVRect;
texSet.GetRectsForTextureBakeResults(out allPropsUseSameTiling_encapsulatingSamplingRect, out propsUseDifferntTiling_obUVRect);
for (int j = 0; j < mats.Count; j++)
{
Rect allPropsUseSameTiling_sourceMaterialTiling = texSet.GetMaterialTilingRectForTextureBakerResults(j);
MaterialAndUVRect key = new MaterialAndUVRect(
mats[j].mat,
atlasPackingResult.rects[i],
texSet.allTexturesUseSameMatTiling,
allPropsUseSameTiling_sourceMaterialTiling,
allPropsUseSameTiling_encapsulatingSamplingRect,
propsUseDifferntTiling_obUVRect,
texSet.tilingTreatment,
mats[j].objName);
if (!mat2rect_map.Contains(key))
{
mat2rect_map.Add(key);
}
}
}
resultAtlasesAndRects.atlases = atlases; // one per texture on result shader
resultAtlasesAndRects.texPropertyNames =
ShaderTextureProperty.GetNames(data.texPropertyNames); // one per texture on source shader
resultAtlasesAndRects.originMatToRect_map = mat2rect_map;
combiner._destroyAllTemporaryTextures();
}
// texPropertyNames 是 resultMaterial中纹理属性的列表
// allowedMaterialsFilter 是材料列表。 没有这些材料的物体将被忽略。这由多种材质过滤器使用
// textureEditorMethods 仅封装编辑器功能，例如保存资产和跟踪纹理资产谁的格式已更改。 如果在运行时使用，则为null。
static void BeginCombineTexturesIntoAtlases(AtlasesAndRects resultAtlasesAndRects,
TextureCombinePipelineData data,
bool splitAtlasWhenPackingIfTooBig,
EditorMethodsInterface textureEditorMethods)
{
// --- 1、记录各合并物体的源材质的 Prop Texture 信息写入 Data.distinctMaterialTextures
//每个图集（主图，凹凸等）都将有的 MaterialTextures.Count 个图像。
//每个 distinctMaterialTextures 对应一个游戏物体的某个材质，记录一组纹理，分别材质的在每个Prop图集一个。
List <GameObject> usedObjsToMesh = new List <GameObject>();
TextureCombinePipeline.Step1_CollectDistinctMatTexturesAndUsedObjects(
data, textureEditorMethods, usedObjsToMesh);
// --- 2、计算使每个材质属性中的多个材质的合理尺寸
TextureCombinePipeline.Step2_CalculateIdealSizesForTexturesInAtlasAndPadding(
data, textureEditorMethods);
// --- 3、创建特定打包方式的打包器
ITextureCombineAtlasPacker texturePaker = CreateAtlasPacker(
data.IsOnlyOneTextureInAtlasReuseTextures(),
data.packingAlgorithm);
texturePaker.ConvertTexturesToReadableFormats(data, textureEditorMethods);
// --- 4、计算各源材质在合并材质 Atlas 的排布
AtlasPackingResult[] uvRects = texturePaker.CalculateAtlasRectangles(
data, splitAtlasWhenPackingIfTooBig);
// --- 5、创建 Atlas 并保存
TextureCombinePipeline.Step3_BuildAndSaveAtlasesAndStoreResults(
data,
null,
texturePaker,
uvRects[0],
textureEditorMethods,
resultAtlasesAndRects);
}
