//解析一段shader语句的编辑类型
public static void ParseEditorLineType(string line, ref EditorLineType lineType, ref int start, ref int end)
{
lineType = EditorLineType.NONE;
start = -1;
end = -1;
Array linetypes = Enum.GetValues(typeof(EditorLineType));
for (int i = 0; i < linetypes.Length; i++)
{
EditorLineType curtype = (EditorLineType)linetypes.GetValue(i);
if (curtype == EditorLineType.NONE)
{
continue;
}
else
{
string findKey = GetEditorLineTypeString(curtype);
start = line.IndexOf(findKey);
if (start >= 0)
{
lineType = GetEditorLineType(findKey);
end = start + findKey.Length;
}
}
}
}
//根据语句的编辑类型返回标志文本
public static string GetEditorLineTypeString(EditorLineType lineType)
{
switch (lineType)
{
case EditorLineType.COMMENT_MARK:
return(PRAGMA_COMMENT_MARK);
case EditorLineType.DISABLED_MARK:
return(PRAGMA_DISABLED_MARK);
default:
return("");
}
}
//解析shader文本
public static void ScanShader(ref StripShader shader)
{
//重置shader
shader.passes.Clear();
shader.keywords.Clear();
shader.hasBackup = File.Exists(shader.path + BACKUP_SUFFIX);
shader.pendingChanges = false;
shader.editedByShaderControl = false;
//读取shader文本
string[] shaderLines = File.ReadAllLines(shader.path);
string[] separator = new string[] { " " };
StripShaderPass currentPass = new StripShaderPass();
StripShaderPass basePass = null;
int pass = -1;
bool blockComment = false;
StripKeywordLine keywordLine = new StripKeywordLine();
for (int k = 0; k < shaderLines.Length; k++)
{
//删除字符串头部和尾部的空格
string line = shaderLines[k].Trim();
if (line.Length == 0)
{
continue;
}
//是否是注释行
IsBlockCommentLine(line, ref blockComment);
if (blockComment)
{
continue;
}
string lineUPPER = line.ToUpper();
if (lineUPPER.Equals("PASS") || lineUPPER.StartsWith("PASS "))
{
if (pass >= 0)
{
currentPass.pass = pass;
if (basePass != null)
{
currentPass.Add(basePass.keywordLines);
}
shader.Add(currentPass);
}
else if (currentPass.keywordCount > 0)
{
basePass = currentPass;
}
currentPass = new StripShaderPass();
pass++;
continue;
}
//第一个注释符号 //的位置
int lineCommentIndex = CommentLineIndex(line);
//编辑器添加的语句行信息
EditorLineType editorLine = EditorLineType.NONE;
int editorStartIndex = -1;
int editorEndIndex = -1;
ParseEditorLineType(line, ref editorLine, ref editorStartIndex, ref editorEndIndex);
//该行是注释行 并且不是被主动编辑的 跳过
if (lineCommentIndex == 0 && editorLine == EditorLineType.NONE)
{
continue; // 跳过注释
}
//shader关键字语句行信息
ShaderLineType shaderLine = ShaderLineType.NONE;
int keyStartIndex = -1;
int keyEndIndex = -1;
ParseShaderLineType(line, ref shaderLine, ref keyStartIndex, ref keyEndIndex);
//并非是被程序编辑过的
if (editorLine == EditorLineType.NONE)
{
//如果是手写输入的关键字
if (IsInputShortcut(shaderLine))
{
keyStartIndex = Mathf.Max(0, keyStartIndex);
keyEndIndex = Mathf.Max(0, keyEndIndex);
//检查PRAGMA 关键字之后的字符串是否包含注释
int commentindex = CommentLineIndex(line, keyStartIndex + keyEndIndex);
if (commentindex < 0)
{
commentindex = line.Length;
}
int length = commentindex - (keyStartIndex + keyEndIndex);
//用空格分割 PRAGMA语句到//注释符号之间的语句
string[] splitedKeys = line.Substring(keyStartIndex + keyEndIndex, length).Split(separator, StringSplitOptions.RemoveEmptyEntries);
if (splitedKeys.Length > 0)
{
keywordLine = new StripKeywordLine();
//是剔除字段
bool isSkip = shaderLine == ShaderLineType.SKIP_VARIANTS;
currentPass.hasSkipKeyword = isSkip?isSkip:currentPass.hasSkipKeyword;
//添加手写关键字
for (int i = 0; i < splitedKeys.Length; i++)
{
splitedKeys[i] = splitedKeys[i].Trim();
StripKeyword keyword = keywordLine.GetKeyword(splitedKeys[i]);
if (keyword == null)
{
keyword = new StripKeyword(splitedKeys[i]);
}
keyword.enabled = true;
keyword.isSkip = isSkip;
keywordLine.Add(keyword);
}
keywordLine.editorLineType = editorLine;
keywordLine.shaderLineType = shaderLine;
currentPass.Add(keywordLine);
}
}
else //添加缩写marco的内置关键字
if (IsBuiltinShortcut(shaderLine))
{
keywordLine = new StripKeywordLine();
string[] buildinkeys = GetShortcutKeywords(shaderLine);
for (int i = 0; i < buildinkeys.Length; i++)
{
StripKeyword keyword = keywordLine.GetKeyword(buildinkeys[i]);
if (keyword == null)
{
keyword = new StripKeyword(buildinkeys[i]);
}
keyword.enabled = true;
keyword.isSkip = false;
keywordLine.Add(keyword);
}
keywordLine.editorLineType = editorLine;
keywordLine.shaderLineType = shaderLine;
currentPass.Add(keywordLine);
}
}
}
currentPass.pass = Mathf.Max(pass, 0);
if (basePass != null)
{
currentPass.Add(basePass.keywordLines);
}
shader.Add(currentPass);
shader.UpdateVariantCount();
}
