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  • Questions about an Engine Java

    - by CJ Sculti
    so I am going to start developing Java games (3D) but I have a few questions. So I dont know if I should use an engine or make my own. I feel like I am "cheating" if I use an engine to make my game. Is it frowned upon in the game developing world? What are some advantages and disadvantages to using an engine for my game and is it really that much harder to make my own engine? I know that engines have built in models and textures with easy drag and drop interfaces, would I have any of that if I were to code my own engine? Thanks guys.

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  • How to implement turn-based game engine?

    - by Dvole
    Let's imagine game like Heroes of Might and Magic, or Master of Orion, or your turn-based game of choice. What is the game logic behind making next turn? Are there any materials or books to read about the topic? To be specific, let's imagine game loop: void eventsHandler(); //something that responds to input void gameLogic(); //something that decides whats going to be output on the screen void render(); //this function outputs stuff on screen All those are getting called say 60 times a second. But how turn-based enters here? I might imagine that in gameLogic() there is a function like endTurn() that happens when a player clicks that button, but how do I handle it all? Need insights.

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  • Block With Given ID Does Not Exist - Minecraft Mod

    - by inixsoftware
    I have tried to make my own Minecraft Block using Forge, but for some reason, when I use /give Playerxxx 1000 1 the game says, There is no block with id '1000' My Block Code: package net.minecraft.blockr; import net.minecraft.block.Block; import net.minecraft.block.material.Material; import net.minecraft.creativetab.CreativeTabs; public class Basalt extends Block { public Basalt(int par1, Material par2Material) { super(par1, par2Material); this.setCreativeTab(CreativeTabs.tabBlock); } } Mod code: package net.minecraft.blockr; import cpw.mods.fml.common.Mod; import cpw.mods.fml.common.Mod.Init; import cpw.mods.fml.common.network.NetworkMod; import cpw.mods.fml.common.registry.GameRegistry; import cpw.mods.fml.common.registry.LanguageRegistry; import net.minecraft.block.Block; import net.minecraft.block.material.Material; @Mod(modid="blockr", name="Blockr Mod", version="PreAlpha v0.0.1") @NetworkMod(clientSideRequired=true, serverSideRequired=false) public class BlockrMod { public static Block basalt; @Init public void load() { basalt = new Basalt(1000, Material.ground).setUnlocalizedName("basalt"); GameRegistry.registerBlock(basalt, basalt.getUnlocalizedName()); LanguageRegistry.addName(basalt, "Basalt Block"); } public String getVersion() { return "0.0.1"; } } What exactly is going wrong? My package is blockr (as my mod is called blockr) I know my mod was loaded as I see in Forge under Mods I see my mod

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  • Pygame Import Error, Python 3.2

    - by Treb Nicholas
    I'm having an issue with the Pygame module. I run Python 3.2 and installed the respective Pygame file, but now when I try to import it in the IDLE, it gives me this error: import pygame Traceback (most recent call last): File "", line 1, in import pygame File "C:\Python32\lib\site-packages\pygame__init__.py", line 95, in from pygame.base import * ImportError: DLL load failed: %1 is not a valid Win32 application. Any help will be appreciated.

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  • Should pathfinder in A* hold closedSet and openedSet or each object should hold its sets?

    - by Patryk
    I am about to implement A* pathfinding algorithm and I wonder how should I implement this - from the point of view of architecture. I have the pathfinder as a class - I think I will instantiate only one object of this class (or maybe make it a Singleton - this is not so important). The hardest part for me is whether the closedSet and openedSet should be attached to objects that can find the path for them or should be stored in pathfinder class ? I am opened to any hints and critique whatsoever. What is the best practice considering pathfinding in terms of design ?

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  • How can I fit a rectangle to an irregular shape?

    - by Anil gupta
    I used masking for breaking an image into the below pattern. Now that it's broken into different pieces I need to make a rectangle of each piece. I need to drag the broken pieces and adjust to the correct position so I can reconstruct the image. To drag and put at the right position I need to make the pieces rectangles but I am not getting the idea of how to make rectangles out of these irregular shapes. How can I make rectangles for manipulating these pieces? This is a follow up to my previous question.

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  • Shadow mapping with deffered shading for directional lights - shadow map projection problem

    - by Harry
    I'm trying to implement shadow mapping to my engine. I started with directional lights because they seemed to be the easiest one, but I was wrong :) I have implemented deferred shading and I retrieve position from depth. I think that there is the biggest problem but code looks ok for me. Now more about problem: Shadow map projected onto meshes looks bad scaled and translated and also some informations from shadow map texture aren't visible. You can see it on this screen: http://img5.imageshack.us/img5/2254/93dn.png Yelow frustum is light frustum and I have mixed shadow map preview and actual scene. As you can see shadows are in wrong place and shadow of cone and sphere aren't visible. Could you look at my codes and tell me where I have a mistake? // create shadow map if(!_shd)glGenTextures(1, &_shd); glBindTexture(GL_TEXTURE_2D, _shd); glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, 1024, 1024, 0, GL_DEPTH_COMPONENT, GL_FLOAT,NULL); // shadow map size glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, _shd, 0); glDrawBuffer(GL_NONE); // setting camera Vector dire=Vector(0,0,1); ACamera.setLookAt(dire,Vector(0)); ACamera.setPerspectiveView(60.0f,1,0.1f,10.0f); // currently needed for proper frustum corners calculation Vector min(ACamera._point[0]),max(ACamera._point[0]); for(int i=0;i<8;i++){ max=Max(max,ACamera._point[i]); min=Min(min,ACamera._point[i]); } ACamera.setOrthogonalView(min.x,max.x,min.y,max.y,-max.z,-min.z); glBindFramebuffer(GL_DRAW_FRAMEBUFFER, _s_buffer); // framebuffer for shadow map // rendering to depth buffer glBindFramebuffer(GL_DRAW_FRAMEBUFFER, _g_buffer); Shaders["DirLight"].set(true); Matrix4 bias; bias.x.set(0.5,0.0,0.0,0.0); bias.y.set(0.0,0.5,0.0,0.0); bias.z.set(0.0,0.0,0.5,0.0); bias.w.set(0.5,0.5,0.5,1.0); Shaders["DirLight"].set("textureMatrix",ACamera.matrix*Projection3D*bias); // order of multiplications are 100% correct, everything gives mi the same result as using glm glActiveTexture(GL_TEXTURE5); glBindTexture(GL_TEXTURE_2D,_shd); lightDir(dir); // light calculations Vertex Shader makes nothing related to shadow calculatons Pixel shader function which calculates if pixel is in shadow or not: float readShadowMap(vec3 eyeDir) { // retrieve depth of pixel float z = texture2D(depth, gl_FragCoord.xy/screen).z; vec3 pos = vec3(gl_FragCoord.xy/screen, z); // transform by the projection and view inverse vec4 worldSpace = inverse(View)*inverse(ProjectionMatrix)*vec4(pos*2-1,1); worldSpace /= worldSpace.w; vec4 coord=textureMatrix*worldSpace; float vis=1.0f; if(texture2D(shadow, coord.xy).z < coord.z-0.001)vis=0.2f; return vis; } I also have question about shadows specifically for directional light. Currently I always look at 0,0,0 position and in further implementation I have to move light frustum along to camera frustum. I've found how to do this here: http://www.gamedev.net/topic/505893-orthographic-projection-for-shadow-mapping/ but it doesn't give me what I want. Maybe because of problems mentioned above, but I want know your opinion. EDIT: vec4 worldSpace is position read from depht of the scene (not shadow map). Maybe I wasn't precise so I'll try quick explain what is what: View is camera view matrix, ProjectionMatrix is camera projection,. First I try to get world space position from depth map and then multiply it by textureMatrix which is light view *light projection*bias. Rest of code is the same as in many tutorials. I can't use vertex shader to make something like gl_Position=textureMatrix*gl_Vertex and get it interpolated in fragment shader because of deffered rendering use so I want get it from depht buffer. EDIT2: I also tried make it as in Coding Labs tutorial about Shadow Mapping with Deferred Rendering but unfortunately this either works wrong.

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  • Where do I place XNA content pipeline references?

    - by Zabby Wabby
    I am relatively new to XNA, and have started to delve into the use of the content pipeline. I have already figured out that tricky issue of adding a game library containing classes for any type of .xml file I want to read. Here's the issue. I am trying to handle the reading of all XML content through use of an XMLHandler object that uses the intermediate deserializer. Any time reading of such data is required, the appropriate method within this object would be called. So, as a simple example, something like this would occur when a character levels: public Spell LevelUp(int levelAchived) { XMLHandler.FindSkillsForLevel(levelAchived); } This method would then read the proper .xml file, sending back the spell for the character to learn. However, the XMLHandler is having issues even being created. I cannot get it to use the using namespace of Microsoft.Xna.Framework.Content.Pipeline. I get an error on my using statement in the XMLHandler class: using Microsoft.Xna.Framework.Content.Pipeline.Serialization.Intermediate; The error is a typical reference error: Type or namespace name "'Pipeline' does not exist in the namespace 'Microsoft.Xna.Framework.Content' (are you missing an assembly reference?)" I THINK this is because this namespace is already referenced in my game's content. I would really have no issue placing this object within my game's content (since that is ALL it deals with anyways), but the Content project does not seem capable of holding anything but content files. In summary, I need to use the Intermediate Deserializer in my main project's logic, but, as far as I can make out, I can't safely reference the associated namespace for it outside of the game's content. I'm not a terribly well-versed programmer, so I may be just missing some big detail I've never learned here. How can I make this object accessible for all projects within the solution? I will gladly post more information if needed!

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  • Can i make money with my Android Engine or should I focus on game-making?

    - by Roger Travis
    I have dedicated past few month to developing my own android 2d engine. You can see its description, demo and tutorials here http://www.aboxengine.com/ ( jar files will be up in a day or two ). While working on the engine I believed it to be better then most available alternatives ( such as andengine, etc. ) and that people would love to use it in their games and, hopefully, would give me some royalties. Yet as I started posting about my engine on other forums, it start looking like people are only interested in free/opensource engines. Based on your experience, what do you think, is there some way for me to make money with that engine or should I forget about selling it and more focus on making games with it myself? Thanks!

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  • How do I set a touch listener in a child scene in AndEngine?

    - by Siddharth
    In my game, I want to implement touch listener for my child scene objects. Basically I tried all the possible way to implement this that I have usually done for my normal scenes, but those methods do not work here. Could somebody provide some guidance for setting touch area listener in child scene? Here is my code: menuScene.setTouchAreaBindingEnabled(true); menuScene.registerTouchArea(resumeButtonSprite); menuScene.registerTouchArea(retryButtonSprite); menuScene.registerTouchArea(exitButtonSprite); menuScene.setOnAreaTouchListener(new IOnAreaTouchListener() { @Override public boolean onAreaTouched(TouchEvent pSceneTouchEvent, ITouchArea pTouchArea, float pTouchAreaLocalX, float pTouchAreaLocalY) { System.out.println("Touch"); return true; } }); In this code, menuScene was a child scene activity. Also after research I found that my engine was stopped while the child scene was activated so the touch event is not detected. I want to implement a pause menu in my game so any desirable solution for a pause menu implementation would help.

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  • Pathfinding Java library

    - by Shivan Dragon
    I'm an amateur game developer and somewhat amateur Java developer as well. I'm trying to find a way to have path finding for my game(s). I've first googled for some existing Java libraries that have various path-finding implementations, but I've failed to find any. It seems to me that the only way to get pathfinding code is to use it via a game engine (like Unity). But I'd just like to have a library that I can use and make the game loop and other stuff on my own. Failing to find such a library I've tried implementing some algorithms myself. I've managed to make a running AStar in Java, but for fancier stuff like DStar I find it hard to do it by hand. So then, my question is, are there any Java libraries that contain at least some basic pathfinding algorithms implementations?

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  • Camera rotation flicker in OpenGL ES 2.0

    - by seahorse
    I implemented an orbit camera in my own OpenGL ES 2.0 application. I was getting extensive amount of flicker while rotating the camera using the mouse. When I added the line eglSwapInterval( ..., 0.1); after eglSwapBuffers() and then the flicker immediately stopped. I am not able to understand why eglSwapInterval solves the flicker problem? (The FPS of my app prior to eglSwapInterval was around 700FPS) (The flicker is NOT due to z-fighting because I have set near and far clip planes as 100 and 500)

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  • How can I use multiple meshes per entity without breaking one component of a single type per entity?

    - by Mathias Hölzl
    We are just switching from a hierarchy based game engine to a component based game engine. My problem is that when I load a model which has has a hierarchy of meshes and the way I understand is that a entity in a component based system can not have multiple components of the same type, but I need a "meshComponent" for each mesh in a model. So how could I solve this problem. On this side they implemented a Component based game engine: http://cowboyprogramming.com/2007/01/05/evolve-your-heirachy/

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  • Eliminate delay between looping XNA songs?

    - by Stephane Beniak
    I'm making a game with XNA and trying to get some background music to loop correctly. Because the file is an MP3 of about 30 seconds in length, I instantiated it as a Song. I want it to loop perfectly, but even when I set the MediaPlayer.IsRepeating property to true, there is always a delay of about one second before the song starts up again. Is there any way to eliminate this delay such that the song loops instantly, so it can play more fluently?

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  • Libgdx detect when player is outside of screen

    - by Rockyy
    Im trying to learn libGDX (coming from XNA/MonoDevelop), and I'm making a super simple test game to get to know it better. I was wondering how to detect if the player sprite is outside of the screen and make it so it is impossible to go outside of the screen edges. In XNA you could do something like this: // Prevent player from moving off the left edge of the screen if (player.Position.X < 0) player.Position = new Vector2(0, player.Position.Y); How is this achieved in libgdx? I think it's the Stage that handles the 2D viewport in libgdx? This is my code so far: private Texture texture; private SpriteBatch batch; private Sprite sprite; @Override public void create () { float w = Gdx.graphics.getWidth(); float h = Gdx.graphics.getHeight(); batch = new SpriteBatch(); texture = new Texture(Gdx.files.internal("player.png")); sprite = new Sprite(texture); sprite.setPosition(w/2 -sprite.getWidth()/2, h/2 - sprite.getHeight()/2); } @Override public void render () { Gdx.gl.glClearColor(1, 1, 1, 1); Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT); if(Gdx.input.isKeyPressed(Input.Keys.LEFT)){ if(Gdx.input.isKeyPressed(Input.Keys.CONTROL_LEFT)) sprite.translateX(-1f); else sprite.translateX(-10.0f); } if(Gdx.input.isKeyPressed(Input.Keys.RIGHT)){ if(Gdx.input.isKeyPressed(Input.Keys.CONTROL_LEFT)) sprite.translateX(1f); else sprite.translateX(10f); } batch.begin(); sprite.draw(batch); batch.end(); }

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  • Algorithm for spreading labels in a visually appealing and intuitive way

    - by mac
    Short version Is there a design pattern for distributing vehicle labels in a non-overlapping fashion, placing them as close as possible to the vehicle they refer to? If not, is any of the method I suggest viable? How would you implement this yourself? Extended version In the game I'm writing I have a bird-eye vision of my airborne vehicles. I also have next to each of the vehicles a small label with key-data about the vehicle. This is an actual screenshot: Now, since the vehicles could be flying at different altitudes, their icons could overlap. However I would like to never have their labels overlapping (or a label from vehicle 'A' overlap the icon of vehicle 'B'). Currently, I can detect collisions between sprites and I simply push away the offending label in a direction opposite to the otherwise-overlapped sprite. This works in most situations, but when the airspace get crowded, the label can get pushed very far away from its vehicle, even if there was an alternate "smarter" alternative. For example I get: B - label A -----------label C - label where it would be better (= label closer to the vehicle) to get: B - label label - A C - label EDIT: It also has to be considered that beside the overlapping vehicles case, there might be other configurations in which vehicles'labels could overlap (the ASCII-art examples show for example three very close vehicles in which the label of A would overlap the icon of B and C). I have two ideas on how to improve the present situation, but before spending time implementing them, I thought to turn to the community for advice (after all it seems like a "common enough problem" that a design pattern for it could exist). For what it's worth, here's the two ideas I was thinking to: Slot-isation of label space In this scenario I would divide all the screen into "slots" for the labels. Then, each vehicle would always have its label placed in the closest empty one (empty = no other sprites at that location. Spiralling search From the location of the vehicle on the screen, I would try to place the label at increasing angles and then at increasing radiuses, until a non-overlapping location is found. Something down the line of: try 0°, 10px try 10°, 10px try 20°, 10px ... try 350°, 10px try 0°, 20px try 10°, 20px ...

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  • Is it possible to do freelancing with 3dsmax?

    - by Mirror51
    I am learning 3dsmax architecture for building models of houses. Is it possible to do freelancing with house modelling thing? For various reasons I have to stay at home. So I was wondering if I can earn some money by making some house models for someone. I really don't know how this works but may be someone can give some ideas. Would I need to go to construction or real estate companies and ask them if they want something like this?

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  • What's the standard location of a 3D clipping box?

    - by Kendall Frey
    The way I understand 3D rendering, polygons are transformed using several matrices, and they are then clipped if they are not inside a certain box, before projecting the box onto the screen. Before transformation, the visible area is typically a frustum, and after transformation, I am guessing it's a cube. This cube makes the clipping math easier than a frustum would. My question is, what's the 'standard' location/size for this clipping box? I can think of 3 possibilities: (0,0,0)-(1,1,1), (-0.5,-0.5,-0.5)-(0.5,0.5,0.5), (-1,-1,-1)-(1,1,1) Or is there no standard?

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  • How to draw image in memory manually in pyglet?

    - by Mossen
    In pyglet, I want to create an image buffer in memory, then set the bytes manually, then draw it. I tried making a 3x3 red square like this in my draw() function: imageData = pyglet.image.ImageData(3, 3, 'RGB', [1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0 ]) imageData.blit(10, 10) ...but at runtime, Python complains: ctypes.ArgumentError: argument 9: <type 'exceptions.TypeError'>: wrong type Is this the right approach? Am I missing a step? How can I fix this?

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  • Beat detection, weird detection

    - by Quincy
    I made this soundanalyzer class to detect beats in songs : // put it on pastebin for the big size, will put it here if people rather want that. pastebin.com/8PdgZPP3 but for some reason its only detecting beats from 637 sec to around 641(sec) and I have no idea why. I know the beats are being inserted from multiple bands since I am finding duplicates and it seems as its assigning a beat to each instant energy value in between those values. Its modeled after this : http://www.flipcode.com/misc/BeatDetectionAlgorithms.pdf So why won't the beats properly register ?

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  • Get Unity to read in objects name without the need to hard code

    - by N0xus
    I'm trying to get away from having to hard code in the names of objects I want my code to use. For example, I'm use to do it this way: TextAsset test = new TextAsset(); test = (TextAsset)Resources.Load("test.txt", typeof(TextAsset)); What I want to know, is there a way to have so that when I drag my test.txt file onto my object in Unity, my code automatically gets the name of that object? I'm wanting to do this so once I write the code, I don't need to back in and change it should I wish re-use it.

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  • Issue with distinguishing levels in isometric game

    - by Konrad
    I'm working on an isometric game however I am having trouble visually distinguishing between levels in the game. Take the example below, the first image shows concrete blocks at ground level and the following images show an attempt to build a few blocks a level above. As you can see the level above is visually swallowed the one below. I've tried shading to make lower levels darker with respect to camera, but this doesn't work that well.. any ideas?

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  • Design pattern for procedural terrain assets

    - by Alex
    I'm developing a procedural terrain class at the moment and am stuck on the correct design pattern. The terrain is 2D and is constructed from a series of (x,y) points. I currently have a method that just randomly adds points to an array of points to generate a random spread of points. However I need a more elaborate system for generating the terrain. The terrain will be built form a series of re-accuring terrain structures eg. a pit, jump, hill etc. Each structure will have some randomness assigned to it, each height of hill will be random, pit size will be random etc. Each terrain structure will have: A property detailing the number of points making up that structure A method for generating the points (not absolutely necessary) My current thinking is to have a class for each terrain structure, create a fixed amount of terrain elements ahead of the player, loop over these and add the corresponding points to the game. What is the best way to create these procedural terrain structures when they are ultimately just a set of functions for generating terrain elements? Is a class for each terrain element excessive? I'm developing the game for iphone so any objective-c related answers would be welcome.

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  • What should be contained in a game scene graph?

    - by Bunkai.Satori
    Would you help me to clarify, please, what what exactly should be contained within a game scene graph? See the following list, please: Game Actors? (obviously yes, all the objects changing state should be the major prart of the Scene Graph) Simple static game ojbects? (I mean ojects places in the background that do not get animated, neither do they collide) Game Triggers? Game Lights? Game Cameras? Weapon Bullets? Game Explosions and Special Effects? The above considered object types. Now to the coverage of the scene graph: Should a scene graph contain the whole game level map since the level start, or should it contain only the visible portion of the map? If the second is true, it would mean that scene graph would be continuously updated, by adding/removing game objects, as the player moves. However, containing only the visible are of the map obviously would be much faster to traverse and update.

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  • GLSL subroutine not being used

    - by amoffat
    I'm using a gaussian blur fragment shader. In it, I thought it would be concise to include 2 subroutines: one for selecting the horizontal texture coordinate offsets, and another for the vertical texture coordinate offsets. This way, I just have one gaussian blur shader to manage. Here is the code for my shader. The {{NAME}} bits are template placeholders that I substitute in at shader compile time: #version 420 subroutine vec2 sample_coord_type(int i); subroutine uniform sample_coord_type sample_coord; in vec2 texcoord; out vec3 color; uniform sampler2D tex; uniform int texture_size; const float offsets[{{NUM_SAMPLES}}] = float[]({{SAMPLE_OFFSETS}}); const float weights[{{NUM_SAMPLES}}] = float[]({{SAMPLE_WEIGHTS}}); subroutine(sample_coord_type) vec2 vertical_coord(int i) { return vec2(0.0, offsets[i] / texture_size); } subroutine(sample_coord_type) vec2 horizontal_coord(int i) { //return vec2(offsets[i] / texture_size, 0.0); return vec2(0.0, 0.0); // just for testing if this subroutine gets used } void main(void) { color = vec3(0.0); for (int i=0; i<{{NUM_SAMPLES}}; i++) { color += texture(tex, texcoord + sample_coord(i)).rgb * weights[i]; color += texture(tex, texcoord - sample_coord(i)).rgb * weights[i]; } } Here is my code for selecting the subroutine: blur_program->start(); blur_program->set_subroutine("sample_coord", "vertical_coord", GL_FRAGMENT_SHADER); blur_program->set_int("texture_size", width); blur_program->set_texture("tex", *deferred_output); blur_program->draw(); // draws a quad for the fragment shader to run on and: void ShaderProgram::set_subroutine(constr name, constr routine, GLenum target) { GLuint routine_index = glGetSubroutineIndex(id, target, routine.c_str()); GLuint uniform_index = glGetSubroutineUniformLocation(id, target, name.c_str()); glUniformSubroutinesuiv(target, 1, &routine_index); // debugging int num_subs; glGetActiveSubroutineUniformiv(id, target, uniform_index, GL_NUM_COMPATIBLE_SUBROUTINES, &num_subs); std::cout << uniform_index << " " << routine_index << " " << num_subs << "\n"; } I've checked for errors, and there are none. When I pass in vertical_coord as the routine to use, my scene is blurred vertically, as it should be. The routine_index variable is also 1 (which is weird, because vertical_coord subroutine is the first listed in the shader code...but no matter, maybe the compiler is switching things around) However, when I pass in horizontal_coord, my scene is STILL blurred vertically, even though the value of routine_index is 0, suggesting that a different subroutine is being used. Yet the horizontal_coord subroutine explicitly does not blur. What's more is, whichever subroutine comes first in the shader, is the subroutine that the shader uses permanently. Right now, vertical_coord comes first, so the shader blurs vertically always. If I put horizontal_coord first, the scene is unblurred, as expected, but then I cannot select the vertical_coord subroutine! :) Also, the value of num_subs is 2, suggesting that there are 2 subroutines compatible with my sample_coord subroutine uniform. Just to re-iterate, all of my return values are fine, and there are no glGetError() errors happening. Any ideas?

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