Rewrite printout rendering

 - The current page is always centred when rendering in a GUI, with
   the turned pages moving from the sides.
 - Pages are no longer evenly distributed from the centre - they follow
   an exponential decay curve, so ones further out are closer together
   (a bit like an open book).
 - Render pages and books in item frames/in-hand (rather than just
   single pages).

This currently does some very dirty things with z values in order to
prevent z-fighting. It would be nice to avoid that, though the other
solution of turning off the z mask causes issues when drawing the
bounding box.

Author: SquidDev

src/main/java/dan200/computercraft/client/gui/GuiPrintout.java

@@ -11,7 +11,6 @@
 import dan200.computercraft.shared.media.items.ItemPrintout;
 import net.minecraft.client.gui.inventory.GuiContainer;
 import net.minecraft.client.renderer.GlStateManager;
-import net.minecraft.util.ResourceLocation;
 import org.lwjgl.input.Mouse;
 
 import java.io.IOException;
@@ -20,10 +19,6 @@
 
 public class GuiPrintout extends GuiContainer
 {
-    public static final ResourceLocation BACKGROUND = new ResourceLocation( "computercraft", "textures/gui/printout.png" );
-    public static final int X_SIZE = 172;
-    public static final int Y_SIZE = 209;
-
     private final boolean m_book;
     private final int m_pages;
     private final TextBuffer[] m_text;
@@ -33,23 +28,18 @@ public class GuiPrintout extends GuiContainer
     public GuiPrintout( ContainerHeldItem container )
     {
         super( container );
-        m_book = (ItemPrintout.getType( container.getStack() ) == ItemPrintout.Type.Book);
 
         String[] text = ItemPrintout.getText( container.getStack() );
         m_text = new TextBuffer[ text.length ];
-        for( int i = 0; i < m_text.length; ++i )
-        {
-            m_text[ i ] = new TextBuffer( text[ i ] );
-        }
+        for( int i = 0; i < m_text.length; ++i ) m_text[ i ] = new TextBuffer( text[ i ] );
+
         String[] colours = ItemPrintout.getColours( container.getStack() );
         m_colours = new TextBuffer[ colours.length ];
-        for( int i = 0; i < m_colours.length; ++i )
-        {
-            m_colours[ i ] = new TextBuffer( colours[ i ] );
-        }
+        for( int i = 0; i < m_colours.length; ++i ) m_colours[ i ] = new TextBuffer( colours[ i ] );
 
-        m_pages = Math.max( m_text.length / ItemPrintout.LINES_PER_PAGE, 1 );
         m_page = 0;
+        m_pages = Math.max( m_text.length / ItemPrintout.LINES_PER_PAGE, 1 );
+        m_book = ItemPrintout.getType( container.getStack() ) == ItemPrintout.Type.Book;
     }
 
     @Override

src/main/java/dan200/computercraft/client/render/PrintoutRenderer.java

@@ -2,32 +2,33 @@
 
 import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.client.gui.FixedWidthFontRenderer;
-import dan200.computercraft.client.gui.GuiPrintout;
 import dan200.computercraft.core.terminal.TextBuffer;
 import dan200.computercraft.shared.util.Palette;
 import net.minecraft.client.Minecraft;
 import net.minecraft.client.renderer.BufferBuilder;
 import net.minecraft.client.renderer.GlStateManager;
 import net.minecraft.client.renderer.Tessellator;
 import net.minecraft.client.renderer.vertex.DefaultVertexFormats;
+import net.minecraft.util.ResourceLocation;
 import org.lwjgl.opengl.GL11;
 
 import static dan200.computercraft.client.gui.FixedWidthFontRenderer.FONT_HEIGHT;
 import static dan200.computercraft.shared.media.items.ItemPrintout.LINES_PER_PAGE;
 
 public class PrintoutRenderer
 {
-    private static final double SIZE = 256.0;
+    private static final ResourceLocation BG = new ResourceLocation( "computercraft", "textures/gui/printout.png" );
+    private static final double BG_SIZE = 256.0;
 
     /**
      * Width of a page
      */
-    private static final int X_SIZE = 172;
+    public static final int X_SIZE = 172;
 
     /**
      * Height of a page
      */
-    private static final int Y_SIZE = 209;
+    public static final int Y_SIZE = 209;
 
     /**
      * Padding between the left and right of a page and the text
@@ -75,7 +76,7 @@ public static void drawText( int x, int y, int start, String[] text, String[] co
     public static void drawBorder( double x, double y, double z, int page, int pages, boolean isBook )
     {
         GlStateManager.color( 1.0f, 1.0f, 1.0f, 1.0f );
-        Minecraft.getMinecraft().getTextureManager().bindTexture( GuiPrintout.BACKGROUND );
+        Minecraft.getMinecraft().getTextureManager().bindTexture( BG );
 
         Tessellator tessellator = Tessellator.getInstance();
         BufferBuilder buffer = tessellator.getBuffer();
@@ -140,18 +141,18 @@ public static void drawBorder( double x, double y, double z, int page, int pages
 
     private static void drawTexture( BufferBuilder buffer, double x, double y, double z, double u, double v, double width, double height )
     {
-        buffer.pos( x, y + height, z ).tex( u / SIZE, (v + height) / SIZE ).endVertex();
-        buffer.pos( x + width, y + height, z ).tex( (u + width) / SIZE, (v + height) / SIZE ).endVertex();
-        buffer.pos( x + width, y, z ).tex( (u + width) / SIZE, v / SIZE ).endVertex();
-        buffer.pos( x, y, z ).tex( u / SIZE, v / SIZE ).endVertex();
+        buffer.pos( x, y + height, z ).tex( u / BG_SIZE, (v + height) / BG_SIZE ).endVertex();
+        buffer.pos( x + width, y + height, z ).tex( (u + width) / BG_SIZE, (v + height) / BG_SIZE ).endVertex();
+        buffer.pos( x + width, y, z ).tex( (u + width) / BG_SIZE, v / BG_SIZE ).endVertex();
+        buffer.pos( x, y, z ).tex( u / BG_SIZE, v / BG_SIZE ).endVertex();
     }
 
     private static void drawTexture( BufferBuilder buffer, double x, double y, double z, double width, double height, double u, double v, double tWidth, double tHeight )
     {
-        buffer.pos( x, y + height, z ).tex( u / SIZE, (v + tHeight) / SIZE ).endVertex();
-        buffer.pos( x + width, y + height, z ).tex( (u + tWidth) / SIZE, (v + tHeight) / SIZE ).endVertex();
-        buffer.pos( x + width, y, z ).tex( (u + tWidth) / SIZE, v / SIZE ).endVertex();
-        buffer.pos( x, y, z ).tex( u / SIZE, v / SIZE ).endVertex();
+        buffer.pos( x, y + height, z ).tex( u / BG_SIZE, (v + tHeight) / BG_SIZE ).endVertex();
+        buffer.pos( x + width, y + height, z ).tex( (u + tWidth) / BG_SIZE, (v + tHeight) / BG_SIZE ).endVertex();
+        buffer.pos( x + width, y, z ).tex( (u + tWidth) / BG_SIZE, v / BG_SIZE ).endVertex();
+        buffer.pos( x, y, z ).tex( u / BG_SIZE, v / BG_SIZE ).endVertex();
     }
 
     public static double offsetAt( int page )