编译着色器并在屏幕上绘图

class TextResourceReader {
    comp服务器托管网anion object{
        fun readTextFileFromResource(context: Context, id:Int):String{
            val stringBuilder=StringBuilder()
            val inputStream=context.resources.openRawResource(id)
            val inputStreamReader= InputStreamReader(inputStream)
            val bufferedReader= BufferedReader(inputStreamReader)
            var nextLine:String?=bufferedReader.readLine()
            while(nextLine!=null){
                stringBuilder.append(nextLine)
                stringBuilder.append("n")
                nextLine=bufferedReader.readLine()
            }
            return stringBuilder.toString()
        }
    }
}

class ShaderHelper {
    companion object{
        //编译顶点着色器
        fun compileVertexShader(shaderCode:String):Int{
            return compileShader(GL_VERTEX_SHADER,shaderCode)
        }
        //编译片段着色器
        fun compileFragmentShader(shaderCode:String):Int{
            return compileShader(GL_FRAGMENT_SHADER,shaderCode)
        }
        //根据不同类型编译不同的着色器
        fun compileShader(type:Int,shaderCode:String):Int{
            //创建着色器对象
            val shaderObjectId=glCreateShader(type)
            //返回0表示创建失败
            if(shaderObjectId==0){
                Log.i("ShaderHelper","Could not create new shader")
                return 0
            }
            //上传着色器源代码
            glShaderSource(shaderObjectId,shaderCode)
            //编译着色器对象
            glCompileShader(shaderObjectId)
            //检查着色器是否编译成功，并把结果存入数组的首地址
            val status= IntArray(1)
            glGetShaderiv(shaderObjectId,GL_COMPILE_STATUS,status,0)
            //结果为0表示编译着色器失败
            if(status[0]==0){
                glDeleteShader(shaderObjectId)//删除着色器对象
                return 0
            }
            return shaderObjectId
        }
    }
}

        fun linkProgram(vertexShaderId:Int,fragmentShaderId:Int):Int{
            //新建程序对象
            val programObjectId=glCreateProgram()
            if(programObjectId==0){//新建程序对象失败
                Log.i("ShaderHelper","Could not create programObject")
                return 0
            }
            //附上顶点着色器对象和片段着色器对象
            glAttachShader(programObjectId,vertexShaderId)
            glAttachShader(programObjectId,fragmentShaderId)
            //链接程序
            glLinkProgram(programObjectId)
            //检查程序是否链接成功
            val status=IntArray(1)
            glGetProgramiv(programObjectId,GL_LINK_STATUS,status,0)
            if(status[0]==0){//程序链接失败
                glDeleteProgram(programObjectId)//删除程序对象
                Log.i("ShaderHelper","Could not link program")
                return 0
            }
            return programObjectId
        }