Undefined Reference Error When Compiling Tap To Jump Game

tshoats · December 2017

Hey everyone, I was looking for a way to jump on, and off objects via 2D Camera, and I see Tap To Jump has some features like this. As I added the game to the example folder using notepad++ (raylib preconfig), im getting errors when I try to compile and run the game. Here's the github source https://github.com/MarcMDE/TapToJump/

The errors I get are below::

gcc -o advance_game.exe advance_game.c -s C:\raylib\raylib\raylib_icon -Iexternal -lraylib -lglfw3 -lopengl32 -lgdi32 -lopenal32 -lwinmm -std=c99 -Wl,-allow-multiple-definition -Wl,--subsystem,windows
Process started >>>

AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0x76): undefined reference to `InitGameplayScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0xb0): undefined reference to `UpdateLogoScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0xb5): undefined reference to `FinishLogoScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0xd3): undefined reference to `UpdateTitleScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0xd8): undefined reference to `FinishTitleScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0xf0): undefined reference to `FinishTitleScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0x108): undefined reference to `UpdateOptionsScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0x10d): undefined reference to `FinishOptionsScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0x124): undefined reference to `UpdateGameplayScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0x129): undefined reference to `FinishGameplayScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0x140): undefined reference to `UpdateEndingScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0x145): undefined reference to `FinishEndingScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0x1ab): undefined reference to `DrawLogoScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0x1b2): undefined reference to `DrawTitleScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0x1b9): undefined reference to `DrawOptionsScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0x1c0): undefined reference to `DrawGameplayScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0x1c7): undefined reference to `DrawEndingScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0x28f): undefined reference to `UnloadLogoScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0x296): undefined reference to `UnloadTitleScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0x29d): undefined reference to `UnloadOptionsScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0x2a4): undefined reference to `UnloadGameplayScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0x2ab): undefined reference to `UnloadEndingScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0x2c6): undefined reference to `InitLogoScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0x2d7): undefined reference to `InitTitleScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0x2e8): undefined reference to `InitOptionsScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0x2f9): undefined reference to `InitGameplayScreen'
AppData\Local\Temp\ccKMFfeC.o:advance_game.c:(.text+0x30a): undefined reference to `InitEndingScreen'

raysan5 · December 2017

you need to use Makefile to compile that game, check raylib/templates folder for examples. On Notepad++ just use Makefile script.

Just notice that TapToJump is a bit old game and could not be updated, so maybe it doesn't compile correctly on current version.

tshoats · December 2017

Thanks, yea it dosen't compile correctly, but I decided to build my own simple jumping/colliding game. Could you give me any advice on jumping on, and off objects. I've been working on this for a few days, and I've been using the 2D Camera example to get my player rectangle to have jump collisions between 2D blocks successfully. I'm able to jump, and collide both left, and right coordinates. I've been struggling to get my player rectangle to now jump/walk on, and off other rectangles. My code example is below::


// Main game loop
	while (!WindowShouldClose())    // Detect window close button or ESC key
	{
		// Update
		-
		            if (IsKeyDown(KEY_RIGHT))
		                         {

			                    player.x += 2;              // Player movement
			                   camera.offset.x -= 2;       // Camera displacement with player movement

		                      }
		                      else if (IsKeyDown(KEY_LEFT))
		                                 {
			                                     player.x -= 2;              // Player movement
			                                    camera.offset.x += 2;       // Camera displacement with player movement
                
		                                  }
        
                                            // jump
                                           if (IsKeyPressed(KEY_SPACE)) {
                                                             player.y = 160;
                                         }
                                        // put player back to ground after jump
	                                   if (IsKeyReleased(KEY_SPACE)) {
		                                     	player.y = 280;
                                                      }

                                                      // loop through blocks 
		                                     for (int i = 0; i < MAX_BLOCKS; i++) {

                                                                        // check for collisions
			                                      if (CheckCollisionRecs(player, blocks[i])) {


				                                              if (IsKeyDown(KEY_RIGHT))
				                                               {

				                                                  	player.x -= 2;             
					                                               camera.offset.x += 2;       

				                                               }
				                                               else if (IsKeyDown(KEY_LEFT))
				                                                   {
               
					                                                            player.x += 2;              
					                                                             camera.offset.x -= 2;     

				                                                        }

                
                                                                                                        // while jumping stop player from hitting top of block
                                                                                          if(IsKeyPressed(KEY_SPACE)){
                                  
                                                                                            // if player is coming down from jump, or rectangle is under player
                                                                                                    if(player.y >= 160  || blocks[i].y > player.y + player.height){
                                                                                                  player.y = blocks[i].y
                                                                                                      }else{
                  
                                                                                          }
               
                                                                                       } 
                
      
                                                                         }


                                                           }

raysan5 · January 1

Hi tshoats,

Here a couple of references that can be useful:

https://www.polygon.com/features/2014/1/20/5227582/the-rise-of-the-jump
https://www.gamasutra.com/blogs/YoannPignole/20140103/207987/Platformer_controls_how_to_avoid_limpness_and_rigidity_feelings.php
https://www.gamasutra.com/blogs/MohanRajagopalan/20140813/223251/Designing_a_2D_Jump.php

Also let you know about physac, a 2D physics library for raylib, one of the provided examples it's a platformer with jumps.

tshoats · January 1

Thanks Ray! I actually got a working Jumping 2D Camera using Raylib. Raylib made it very easy to get this to work. I used an allegro jumping demo as a reference to build my own. Here's the link for anyone else who wants to implement jumping in their game. https://wiki.allegro.cc/index.php?title=How_to_implement_jumping_in_platformers. I will also check out 2D physac as well..

raysan5 · January 2

Hi tshoats! Great you figured it out! Thanks for the link!

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Undefined Reference Error When Compiling Tap To Jump Game

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