How to Use Texture Fill in Stacked-Bar Chart for Facet Grid-CodePudding

I have this stacked-bar chart with a facet grid. Instead of the four colours used, I want to use the texture of different kinds. I am changing from coloured to texture to make each bar different if printed on black and white paper.

library(ggplot2)
library(reshape2)
set.seed(199)
MB_RMSE_sd1 <-  runif(12, min = 0, max = 2)
TMB_RMSE_sd1 <- runif(12, min = 0, max = 2)
MB_RMSE_sd3 <-  runif(12, min = 2, max = 5)
TMB_RMSE_sd3 <- runif(12, min = 2, max = 5)
MB_RMSE_sd5 <- runif(12, min = 5, max = 10)
TMB_RMSE_sd5 <- runif(12, min = 5, max = 10)
MB_RMSE_sd10 <-  runif(12, min = 7, max = 16)
TMB_RMSE_sd10 <- runif(12, min = 7, max = 16)
MB_MAE_sd1 <-  runif(12, min = 0, max = 2)
TMB_MAE_sd1 <- runif(12, min = 0, max = 2)
MB_MAE_sd3 <-  runif(12, min = 2, max = 5)
TMB_MAE_sd3 <- runif(12, min = 2, max = 5)
MB_MAE_sd5 <-  runif(12, min = 5, max = 10)
TMB_MAE_sd5 <- runif(12, min = 5, max = 10)
MB_MAE_sd10 <-  runif(12, min = 7, max = 16)
TMB_MAE_sd10 <- runif(12, min = 7, max = 16)

ID <- rep(rep(c("N10_AR0.8", "N10_AR0.9", "N10_AR0.95", "N15_AR0.8", "N15_AR0.9", "N15_AR0.95", "N20_AR0.8", "N20_AR0.9", "N20_AR0.95", "N25_AR0.8", "N25_AR0.9", "N25_AR0.95"), 2), 1)
df1 <- data.frame(ID, MB_RMSE_sd1, TMB_MAE_sd1, MB_RMSE_sd3, TMB_MAE_sd3, MB_RMSE_sd5, TMB_MAE_sd5, MB_RMSE_sd10, TMB_MAE_sd10)
reshapp1 <- reshape2::melt(df1, id = "ID")

NEWDAT <- data.frame(value = reshapp1$value, year = reshapp1$ID, n = rep(rep(c("10", "15", "20", "25"), each = 3), 16), Colour = rep(rep(c("RMSE_MB", "RMSE_TMB", "MAE_MB", "MAE_TMB"), each = 12), 4), sd = rep(rep(c(1, 3, 5, 10), each = 48), 1),  phi = rep(rep(c("0.8", "0.9", "0.95"), 16), 4))

NEWDAT$sd <- with(NEWDAT, factor(sd, levels = sd, labels = paste("sd =", sd)))
NEWDAT$year <- factor(NEWDAT$year, levels = NEWDAT$year[1:12])
NEWDAT$n <- with(NEWDAT, factor(n, levels = n, labels = paste("n = ", n)))

ggplot()  
  geom_bar(data=NEWDAT[NEWDAT$Colour %in% c("RMSE_MB", "RMSE_TMB"),], 
           aes(x = phi, y=value, fill=rev(Colour)), stat="identity")  
  geom_bar(data=NEWDAT[NEWDAT$Colour %in% c("MAE_MB", "MAE_TMB"),], 
           aes(x=phi, y=-value, fill=Colour), stat="identity")  
  geom_hline(yintercept=0, colour="grey40")  
  facet_grid(sd ~ n, scales = "free")  
  scale_fill_manual(breaks=c("MAE_MB", "MAE_TMB", "RMSE_MB", "RMSE_TMB"),
                    values=c("red","blue","orange","green"))  
  scale_y_continuous(expand = c(0, 0), label = ~abs(.))   
  guides(fill=guide_legend(reverse=TRUE))  
  labs(fill="")   theme_bw()  
  theme(axis.text.x=element_text(angle=-90, vjust=0.5))

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