Line drawing function?

tf2_mandeokyi · February 9, 2019

I made a function that can draw a line between pos1 and pos2 when the mouse is clicked, but sometimes Minecraft crashes. or instead of crashing, it doesn't draw a line when I click the mouse.

import java.awt.Color;

import org.lwjgl.opengl.GL11;

import net.minecraft.client.renderer.BufferBuilder;
import net.minecraft.client.renderer.Tessellator;
import net.minecraft.client.renderer.vertex.DefaultVertexFormats;
import net.minecraft.util.math.Vec3d;

public class draw3dObjects {
	
	public static void drawLine(Vec3d pos1, Vec3d pos2, Color c, boolean smooth, float width) { // This causes crash (or maybe?)
      
		GL11.glPushAttrib(GL11.GL_ENABLE_BIT);
		GL11.glDisable(GL11.GL_CULL_FACE);
		GL11.glDisable(GL11.GL_LIGHTING);
		GL11.glDisable(GL11.GL_TEXTURE_2D);
		
		GL11.glEnable(GL11.GL_BLEND);
		GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);

		GL11.glColor4d(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha());
		GL11.glLineWidth(width);
		GL11.glDepthMask(false);
		Tessellator tessellator = Tessellator.getInstance();
		BufferBuilder bufferBuilder = tessellator.getBuffer();
		bufferBuilder.begin(GL11.GL_LINES, DefaultVertexFormats.POSITION_COLOR);
		
		int r = c.getRed(), g = c.getGreen(), b = c.getBlue(), a = c.getAlpha();
		
		bufferBuilder.pos(pos1.x, pos1.y, pos1.z).color(r, g, b, a).endVertex();
		bufferBuilder.pos(pos2.x, pos2.y, pos2.z).color(r, g, b, a).endVertex();
		
		tessellator.draw();
		
		GL11.glDepthMask(true);
		GL11.glPopAttrib();
      
	}
  
}

import java.awt.Color;

import /* Some files... */.draw3dObjects;

import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.util.math.Vec3d;
import net.minecraftforge.event.entity.player.PlayerInteractEvent.LeftClickEmpty;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;

public class mouseClickEvents {

	@SubscribeEvent
	public void onPlayerClickedLeftButtonAtAir(LeftClickEmpty event) {

		if(event.getEntity() instanceof EntityPlayer) {

			EntityPlayer player = event.getEntityPlayer();
			draw3dObjects.drawLine(player.getPositionVector(), new Vec3d(1,1,1), new Color(255,0,0,100), true, 3);

		}

	}

}

Can I put them in a function? What's the problem if I can?

tf2_mandeokyi · February 10, 2019

Ok, so as you said, I changed GL11 to GlStateManager (There was GlStateManager, instead of GLStateManager), and placed that function at RenderGameOverlayEvent (Not at PlayerInteractEvent because I don't know how to make a loop at the inside of it).

But Minecraft still crashes when I open the map. Did I miss something?

import java.awt.Color;

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.math.Vec3d;

public class draw3dObjects {
	
	public static void drawLine(Vec3d pos1, Vec3d pos2, Color c, boolean smooth, float width) {
		GlStateManager.pushMatrix();
		
		int r = c.getRed(), g = c.getGreen(), b = c.getBlue(), a = c.getAlpha();
		
		GlStateManager.color(r, g, b, a);
		GlStateManager.glLineWidth(width);
		GlStateManager.depthMask(smooth);
		
		Tessellator t = Tessellator.getInstance();
		BufferBuilder bBuilder = t.getBuffer();
		//bBuilder.begin(GlStateManager.GL_LINES, DefaultVertexFormats.POSITION_COLOR);  // Is this function useful?
		
		bBuilder.pos(pos1.x, pos1.y, pos1.z).color(r, g, b, a).endVertex();
		bBuilder.pos(pos2.x, pos2.y, pos2.z).color(r, g, b, a).endVertex();
		
		t.draw();
		
		GlStateManager.depthMask(true);
		GlStateManager.popMatrix();
	}
}

import java.awt.Color;

import /* Some files... */.draw3dObjects;

import net.minecraft.util.math.Vec3d;
import net.minecraftforge.client.event.RenderGameOverlayEvent;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;

public class gameOverlayEvents {
	
	@SubscribeEvent
	public void renderGame(RenderGameOverlayEvent event) {
		draw3dObjects.drawLine(new Vec3d(5,10,5), new Vec3d(10,10,10), new Color(255,0,0,100), false, 4);
	}
	
}

tf2_mandeokyi · February 11, 2019

As you said, I added .Pre after RenderGameOverlayEvent. (but I don't get ElementType what you're going to say is.)

And I found why Minecraft crashed. It's because that I separated functions at other classes.

But the problem now is that function draws line at HUD, not 3D space.

Any solution?

(btw, GL11 also works well instead of GlStateManager ~~(And for other peoples too),~~ so I changed GlStateManager to GL11.)

import java.awt.Color;

import org.lwjgl.opengl.GL11;

import net.minecraft.client.renderer.BufferBuilder;
import net.minecraft.client.renderer.Tessellator;
import net.minecraft.client.renderer.vertex.DefaultVertexFormats;
import net.minecraft.util.math.Vec3d;
import net.minecraftforge.client.event.RenderGameOverlayEvent;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;

public class gameOverlayEvents {
	
	@SubscribeEvent
	public void renderGame(RenderGameOverlayEvent.Pre event) {
		
		drawBoundingBox(new Vec3d(5,5,5), new Vec3d(5,10,5), new Color(255,0,0,100), false, 1);
		
	}
	
	public static void drawBoundingBox(Vec3d pos1, Vec3d pos2, Color c, boolean smooth, float width) {
		GL11.glPushAttrib(GL11.GL_ENABLE_BIT);
		GL11.glDisable(GL11.GL_CULL_FACE);
		GL11.glDisable(GL11.GL_LIGHTING);
		GL11.glDisable(GL11.GL_TEXTURE_2D);

		GL11.glEnable(GL11.GL_BLEND);
		GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
		GL11.glTranslated(0, 0, 0);
		
		int r = c.getRed(), g = c.getGreen(), b = c.getBlue(), a = c.getAlpha();
		
		GL11.glColor4d(r, g, b, a);
		GL11.glLineWidth(width);
		GL11.glDepthMask(false);
		Tessellator tessellator = Tessellator.getInstance();
		BufferBuilder bufferBuilder = tessellator.getBuffer();
		bufferBuilder.begin(GL11.GL_LINES, DefaultVertexFormats.POSITION_COLOR);
		
		bufferBuilder.pos(pos1.x, pos1.y, pos1.z).color(r, g, b, a).endVertex(); 
		bufferBuilder.pos(pos2.x, pos2.y, pos2.z).color(r, g, b, a).endVertex(); 
		
		tessellator.draw();
		
		GL11.glDepthMask(true);
		GL11.glPopAttrib();
	}
	
} // I copied this code at "http://www.minecraftforge.net/forum/topic/60740-1121-solved-help-to-draw-line/"

tf2_mandeokyi · February 11, 2019

Ok, I'll use GLStateManager.

But because I don't know how to use it, can you show me some examples?

because I can't find any of it about GlStateManager, but the only GL11.

Cadiboo · February 11, 2019

11 hours ago, diesieben07 said:

The methods in GlStateManager are the same as in GL11.

GlStateManager does a bunch of caching and optimisation of the gl methods. If you don’t use it, those caches stop being accurate and you break all other rendering. Aside from this they’re the exact same. If you want to draw in world space you need to do the proper translations. I would use a different event too

tf2_mandeokyi · February 12, 2019

Ok... I changed (again) GL11 to GlStateManager.

But Minecraft crashes when I use GlStateManager (when opening a map). What is the problem with this code?

package com.tf2_mandeokyi.TF2Mod.events;

import java.awt.Color;

import org.lwjgl.opengl.GL11;

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.math.Vec3d;
import net.minecraftforge.client.event.RenderWorldLastEvent;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;

public class gameOverlayEvents {
	
	@SubscribeEvent
	public void renderGame(RenderWorldLastEvent event) {

		drawBoundingBox(new Vec3d(5,5,5), new Vec3d(5,10,5), new Color(255,0,0,100), false, 1);
		
	}
	
	public static void drawBoundingBox(Vec3d pos1, Vec3d pos2, Color c, boolean smooth, float width) {
		
		GlStateManager.pushAttrib();
		GlStateManager.disableCull();
		GlStateManager.disableLighting();
		GlStateManager.disableTexture2D();
		
		GlStateManager.enableBlend();
		GlStateManager.blendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
		
		int r = c.getRed(), g = c.getGreen(), b = c.getBlue(), a = c.getAlpha();
		
		GlStateManager.color(r, g, b, a);
		GlStateManager.glLineWidth(width);
		GlStateManager.depthMask(false);
		
		Tessellator t = Tessellator.getInstance();
		BufferBuilder bb = t.getBuffer();
		bb.begin(GL11.GL_LINES, DefaultVertexFormats.POSITION_COLOR);
		
		bb.pos(pos1.x, pos1.y, pos1.z).color(r, g, b, a).endVertex();
		bb.pos(pos2.x, pos2.y, pos2.z).color(r, g, b, a).endVertex();
		
		GlStateManager.depthMask(true);
		GlStateManager.popAttrib();
		
	}
	
}

log:

Spoiler


[11:20:03] [main/INFO] [STDOUT]: [net.minecraft.init.Bootstrap:printToSYSOUT:629]: ---- Minecraft Crash Report ----
// Would you like a cupcake?

Time: 2/12/19 11:20 AM
Description: Unexpected error

java.lang.IllegalStateException: Already building!
	at net.minecraft.client.renderer.BufferBuilder.begin(BufferBuilder.java:188)
	at net.minecraft.client.model.TexturedQuad.draw(TexturedQuad.java:66)
	at net.minecraft.client.model.ModelBox.render(ModelBox.java:96)
	at net.minecraft.client.model.ModelRenderer.compileDisplayList(ModelRenderer.java:297)
	at net.minecraft.client.model.ModelRenderer.render(ModelRenderer.java:131)
	at net.minecraft.client.renderer.entity.RenderPlayer.renderRightArm(RenderPlayer.java:210)
	at net.minecraft.client.renderer.ItemRenderer.renderArmFirstPerson(ItemRenderer.java:262)
	at net.minecraft.client.renderer.ItemRenderer.renderItemInFirstPerson(ItemRenderer.java:368)
	at net.minecraft.client.renderer.ItemRenderer.renderItemInFirstPerson(ItemRenderer.java:343)
	at net.minecraft.client.renderer.EntityRenderer.renderHand(EntityRenderer.java:826)
	at net.minecraft.client.renderer.EntityRenderer.renderWorldPass(EntityRenderer.java:1492)
	at net.minecraft.client.renderer.EntityRenderer.renderWorld(EntityRenderer.java:1312)
	at net.minecraft.client.renderer.EntityRenderer.updateCameraAndRender(EntityRenderer.java:1115)
	at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1208)
	at net.minecraft.client.Minecraft.run(Minecraft.java:441)
	at net.minecraft.client.main.Main.main(Main.java:118)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97)
	at GradleStart.main(GradleStart.java:25)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Client thread
Stacktrace:
	at net.minecraft.client.renderer.BufferBuilder.begin(BufferBuilder.java:188)
	at net.minecraft.client.model.TexturedQuad.draw(TexturedQuad.java:66)
	at net.minecraft.client.model.ModelBox.render(ModelBox.java:96)
	at net.minecraft.client.model.ModelRenderer.compileDisplayList(ModelRenderer.java:297)
	at net.minecraft.client.model.ModelRenderer.render(ModelRenderer.java:131)
	at net.minecraft.client.renderer.entity.RenderPlayer.renderRightArm(RenderPlayer.java:210)
	at net.minecraft.client.renderer.ItemRenderer.renderArmFirstPerson(ItemRenderer.java:262)
	at net.minecraft.client.renderer.ItemRenderer.renderItemInFirstPerson(ItemRenderer.java:368)
	at net.minecraft.client.renderer.ItemRenderer.renderItemInFirstPerson(ItemRenderer.java:343)
	at net.minecraft.client.renderer.EntityRenderer.renderHand(EntityRenderer.java:826)
	at net.minecraft.client.renderer.EntityRenderer.renderWorldPass(EntityRenderer.java:1492)
	at net.minecraft.client.renderer.EntityRenderer.renderWorld(EntityRenderer.java:1312)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [EntityPlayerSP['Player543'/1, l='MpServer', x=8.50, y=65.00, z=8.50]]
	Chunk stats: MultiplayerChunkCache: 0, 0
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (8,64,8), Chunk: (at 8,4,8 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 0 game time, 0 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
	Forced entities: 1 total; [EntityPlayerSP['Player543'/1, l='MpServer', x=8.50, y=65.00, z=8.50]]
	Retry entities: 0 total; []
	Server brand: fml,forge
	Server type: Integrated singleplayer server
Stacktrace:
	at net.minecraft.client.multiplayer.WorldClient.addWorldInfoToCrashReport(WorldClient.java:461)
	at net.minecraft.client.Minecraft.addGraphicsAndWorldToCrashReport(Minecraft.java:2888)
	at net.minecraft.client.Minecraft.run(Minecraft.java:470)
	at net.minecraft.client.main.Main.main(Main.java:118)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97)
	at GradleStart.main(GradleStart.java:25)

-- System Details --
Details:
	Minecraft Version: 1.12.2
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_181, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 792185640 bytes (755 MB) / 1037959168 bytes (989 MB) up to 1037959168 bytes (989 MB)
	JVM Flags: 3 total; -Xincgc -Xmx1024M -Xms1024M
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	FML: MCP 9.42 Powered by Forge 14.23.5.2768 5 mods loaded, 5 mods active
	States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

	| State     | ID        | Version      | Source                           | Signature |
	|:--------- |:--------- |:------------ |:-------------------------------- |:--------- |
	| UCHIJAAAA | minecraft | 1.12.2       | minecraft.jar                    | None      |
	| UCHIJAAAA | mcp       | 9.42         | minecraft.jar                    | None      |
	| UCHIJAAAA | FML       | 8.0.99.99    | forgeSrc-1.12.2-14.23.5.2768.jar | None      |
	| UCHIJAAAA | forge     | 14.23.5.2768 | forgeSrc-1.12.2-14.23.5.2768.jar | None      |
	| UCHIJAAAA | tf2m      | 1.0          | bin                              | None      |

	Loaded coremods (and transformers): 
	GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.6.0 NVIDIA 391.01' Renderer: 'GeForce GTX 1050 Ti/PCIe/SSE2'
	Launched Version: 1.12.2
	LWJGL: 2.9.4
	OpenGL: GeForce GTX 1050 Ti/PCIe/SSE2 GL version 4.6.0 NVIDIA 391.01, NVIDIA Corporation
	GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

	Using VBOs: Yes
	Is Modded: Definitely; Client brand changed to 'fml,forge'
	Type: Client (map_client.txt)
	Resource Packs: 
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	CPU: 8x Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz
[11:20:03] [Server thread/INFO] [minecraft/MinecraftServer]: Stopping server
[11:20:03] [Server thread/INFO] [minecraft/MinecraftServer]: Saving players
[11:20:03] [main/INFO] [STDOUT]: [net.minecraft.init.Bootstrap:printToSYSOUT:629]: #@!@# Game crashed! Crash report saved to: #@!@# D:\Desktop\some mods\minecraft\TF2 mod\run\.\crash-reports\crash-2019-02-12_11.20.03-client.txt
[11:20:03] [main/INFO] [FML]: Waiting for the server to terminate/save.
[11:20:03] [Server thread/INFO] [minecraft/MinecraftServer]: Saving worlds
[11:20:03] [Server thread/INFO] [minecraft/MinecraftServer]: Saving chunks for level 'tf2 mod'/overworld
[11:20:04] [Server thread/INFO] [FML]: Unloading dimension 0
[11:20:04] [Server thread/INFO] [FML]: Applying holder lookups
[11:20:04] [Server thread/INFO] [FML]: Holder lookups applied
[11:20:04] [main/INFO] [FML]: Server terminated.
[11:20:04] [Client Shutdown Thread/INFO] [minecraft/MinecraftServer]: Stopping server

Edited February 12, 2019 by tf2_mandeokyi
Didn't included something

Cadiboo · February 12, 2019

You never tell the BufferBuilder Tessellator to draw

Edited February 12, 2019 by Cadiboo

tf2_mandeokyi · February 12, 2019

Then how do I draw?

[Edit] (

I got a code that can draw a line. Thankfully it doesn't crash the game, but it doesn't draw a line...

Before:

Tessellator t = Tessellator.getInstance();
BufferBuilder bb = t.getBuffer();
bb.begin(GL11.GL_LINES, DefaultVertexFormats.POSITION_COLOR);

bb.pos(pos1.x, pos1.y, pos1.z).color(r, g, b, a).endVertex();
bb.pos(pos2.x, pos2.y, pos2.z).color(r, g, b, a).endVertex();

After:

GlStateManager.glBegin(GL11.GL_LINES);
		
GlStateManager.glVertex3f((float)pos1.x, (float)pos1.y, (float)pos1.z);
GlStateManager.glVertex3f((float)pos2.x, (float)pos2.y, (float)pos2.z);

GlStateManager.glEnd();

)

Edited February 12, 2019 by tf2_mandeokyi

desht · February 12, 2019

3 hours ago, tf2_mandeokyi said:

Then how do I draw?

You have an instance of Tessellator already, and it has this handy draw() method...

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Line drawing function?

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