OpenGL is a graphics standard and API which targets the desktop and workstation markets. It is designed to be easy to accelerate with dedicated computer hardware, and hence most implementations give greatly improved performance over traditional software rendering. Currently, OpenGL is used for ...
6
votes
1answer
2k views
GLSL - Rewriting shaders from #330 to #130
I recently created a game (LD21) that uses a geometry shader to convert points into textured triangles/culling. Since I was under the impression that the support for #330 was widespread I only wrote ...
5
votes
3answers
3k views
Open Source Engine for RTS [closed]
I must write a cross-platform real-time-strategy game within 2-3 months. I want use C++ and OpenGL and am looking for an engine.
The engine must be open source and work under both Linux and Windows. ...
4
votes
2answers
815 views
Should the modelview and projection matrices be calculated in the shader or on the CPU?
At minimum I would have a camera with rotation and world position; projections parameters such as angle of view and perspective vs. orthographic; and meshes with scale, angle, and world position.
...
3
votes
1answer
62 views
LWJGL Eclipse Resource Deployment
I'm still experimenting with some OpenGL in LWJGL, and as I get to know more and more about OpenGL, I start to do more complicated things like multi texturing, shadowmapping and more. Now, right now ...
2
votes
2answers
378 views
Checking if an object is inside bounds of an isometric chunk
How would I check if an object is inside the bounds of an isometric chunk? for example I have a player and I want to check if its inside the bounds of this isometric chunk.
I draw the isometric ...
1
vote
5answers
901 views
OpenGL Performance Questions
This subject, as with any optimisation problem, gets hit on a lot, but I just couldn't find what I (think) I want.
A lot of tutorials, and even SO questions have similar tips; generally covering:
...
-2
votes
1answer
280 views
What are some good resources for learning OpenGL on Android? [closed]
Mainly I learned how to develop Android applications, but now I want to know how to make
high resolution games, so does someone have a good book or a video that teaches OpenGL?
7
votes
2answers
189 views
Can applications using old versions of Opengl still run on newer cards?
OpenGl 3.0 and up has a quite big difference from the older versions like OpenGl 2.x and opengl 1.x in terms of implementation, does that mean applications which are written with the old versions of ...
6
votes
2answers
731 views
How do I apply skeletal animation from a .x (Direct X) file?
Using the .x format to export a model from Blender, I can load a mesh, armature and animation. I have no problems generating the mesh and viewing models in game. Additionally, I have animations and ...
4
votes
1answer
998 views
Access vertex data stored in VBO in the shader
If I wanted to store extra data in a VBO for skinning (indices for indexing into an array of matrices of bones and floats for applying weights to those bones) How would I go about accessing that data ...
3
votes
2answers
427 views
OpenGL: Is it possible to use VAO's without specifying a VBO
On all the tutorials I can find about VAO's (Vertex Array Objects), they show on how to use them by configuring vertex attributes and binding a VBO (Vertex Buffer Object). But I want to create a VAO ...
3
votes
3answers
336 views
What method replaces GL_SELECT for box selection?
Last 2 weeks I started working on a box selection that selects shapes using GL_SELECT and I just got it working finally.
When looking up resources online, there is a significant number of posts that ...
3
votes
1answer
1k views
GLSL if-else statement unexpected behaviour
This question is related to this other one I asked a few days ago. Because I have finally get to the bottom of the issue, I have rather preferred to open a new question with a more detailed ...
3
votes
2answers
1k views
How does one write to another process's OpenGL/DirectX context?
I want to write a short of chat client that display the messages in-game (OpenGL/DirectX), but I really don't know how to handle this.
It is easy to write my client in my graphic context... but what ...
3
votes
2answers
4k views
View matrix in opengl
Sorry for my clumsy question.
But I don't know where I am wrong at creating view matrix.
I have the following code:
createMatrix(vec4f(xAxis.x, xAxis.y, xAxis.z, dot(xAxis,eye)),
vec4f( ...
2
votes
0answers
366 views
exporting bind and keyframe bone poses from blender to use in OpenGL
EDIT: I decided to reformulate the question in much simpler terms to see if someone can give me a hand with this.
Basically, I'm exporting meshes, skeletons and actions from blender into an engine ...
2
votes
3answers
1k views
Question About An Implementation Of Parallax Scrolling In C++/SDL/OpenGL
I been working in a project with a team for a Software Engineering class and we think that using the parallax scrolling will help our game to look really nice but we are not really sure if our idea ...
1
vote
2answers
998 views
Where to start learning OpenGL with C++? [duplicate]
I'm 16 years old and my name is Norbert.
I have learnt C++ and made some cool text based games and such but I would love to start graphical programming. I'm a decent artist (I will have some of my ...
1
vote
1answer
449 views
Multiple buffering in OpenGL on Windows
What is the most common way modern games perform triple buffering ?
What does the SwapBuffers exactly do in terms of OpenGL states ?
Is it possible to perform double and triple buffering ...
1
vote
1answer
886 views
Pygame water ripple effect
I have Googled for it but there are no ready scripts - as opposed to the same effect on Flash. I have checked the algorithm on The Water Effect Explained and also tested an implementation of the ...
0
votes
0answers
404 views
geomipmapping using displacement mapping (and glVertexAttribDivisor)
I wake up with a clear vision, but sadly my laptop card doesn't do displacement mapping nor glVertexAttribDivisor so I can't test it out; I'm left sharing here:
With geomipmapping, the grid at any ...
11
votes
3answers
2k views
What is the difference between OpenGL 1.x and 2.x?
Is there a good tutorial that shows the difference between OpenGL 1.* and 2.*?
It would be very helpful to know which functions I should not be calling (like glBegin(), I assume).
7
votes
1answer
1k views
SDL2 with OpenGL — weird results, what's wrong?
I'm porting an app to iOS, and therefore need to upgrade it to SDL2 from SDL1.2 (so far I'm testing it as an on OS X desktop app only). However, when running the code with SDL2, I'm getting weird ...
7
votes
6answers
3k views
AAA Games and OpenGL?
What modern AAA games on the top of the market used OpenGL? If applicable, what engine did they use?
6
votes
1answer
112 views
Get SFML to report the version of OpenGL that is being used
How can I get SFML to report the version of OpenGL that is being used by the render window?
6
votes
1answer
324 views
Display Lists in OpenGL
I heard that there was a faster method of displaying vertices, rather than recreating the GL_TRIANGLES, each time the scene is drawn. I thought I read somewhere that this method was obselete. Why ...
6
votes
12answers
6k views
Is it a waste to learn OpenGL?
What I've gathered around the internet and various sources is that DirectX has pretty much taken a stronghold grip onto the graphics API domain. And to be honest, I gave learning DirectX10 a chance, ...
6
votes
2answers
318 views
Changing player color without multiple player bitmaps [duplicate]
Possible Duplicate:
How to colorize certain parts of a model - like RTS games have those team colors?
Ok, so here is my current situation. I have a player model, fully UV mapped, and ...
5
votes
1answer
227 views
Can I leverage the fact that my scene is often static to improve OpenGL (JOGL) performance?
My scene is drawn based on the location of several (often several million) vertices (kept in VBO's) and a camera. I can easily tell in my code when my scene has changed and when it hasn't. There are ...
5
votes
5answers
1k views
Is GLUT obsolete?
A question was asked about good, up-to date OpenGL resources, one of the answers was a link to a tutorial about modern OpenGL programming.
The tutorial in question uses GLUT and GLEW, but I have read ...
5
votes
2answers
846 views
Generating geometry when using VBO
Currently I am working on a project in which I generate geometry based on the players movement. A glorified very long trail, composed of quads.
I am doing this by storing a STD::Vector, and removing ...
4
votes
1answer
134 views
Cheap ways to do scaling ops in shader?
I've got an extensive world terrain that uses vec3 for the vertex position attribute. That's good, because the terrain has endless gradations due to the use of floating point. But I'm thinking about ...
4
votes
1answer
912 views
Interleaving Arrays in OpenGL
In my pursuit to write code that matches todays OpenGL standards I have found that I am completely clueless about interleaving arrays. I've tried and debugged just about everywhere I can think of but ...
4
votes
1answer
981 views
How to invert background pixel's color
I'm writing a game and map editor using Java and jMonkeyEngine. In the map editor, I've got a brush done by wireframed sphere. My problem is: I want to make it visible everywhere, so I want to invert ...
4
votes
2answers
3k views
Does Unity for PC use Direct3D or OpenGL?
I am a mac developer using Unity and I hardly use a PC. When you build a Unity game for Windows, does it use Direct3D or OpenGL?
P.S. I'm not sure if it's called Direct3D or DirectX
3
votes
2answers
386 views
OpenGL behaviour depending on the graphics card?
This is something that never happened to me before. I have an OpenGL code that uses GLSL shaders to texture a 3D model. The code involves a lot of GPU texture processing, blending, etc...
I wanted to ...
3
votes
1answer
1k views
Can't get LWJGL lighting to work
I'm trying to enable lighting in lwjgl according to the method described by NeHe and this post. However, no matter what I try, all faces of my shapes always receive the same amount of light, or, in ...
3
votes
3answers
1k views
Is “pure” OpenGL productive enough?
I know that this is a difficult question and I hope I can convey my meaning. Over time I've used many different engines from XNA over Unity to Panda3d and even tried native directX once. My final ...
3
votes
1answer
911 views
OpenGL ES Basic Fragment Shader help with transparency
I have just spent my first half hour playing with the shader language.
I have modified the basic program I have which renders the texture, to allow me to colour the texture.
varying vec2 texCoord;
...
2
votes
2answers
133 views
Instead of the specified Texture, black circles on a green background are getting rendered. Why?
I'm trying to render a Texture via OpenGL. But instead of the texture black circles on a green background are rendered. (They scale, depending what the rotation of the texture is)
Example:
The ...
2
votes
1answer
157 views
How to debug pyglet/opengl bus errors
I'm using pyglet for game development, and sometimes encounter "bus errors". They are not consistently repeatable, and whenever I try to do simple debugging (eg move/remove variables, etc), the errors ...
2
votes
2answers
946 views
How should I do 3D games through Java on a mac?
I have been self-teaching myself Java on the mac mostly because the language is cross-platform. Recently, I have been only able to develop 2D games using the Graphics2D class.
Now, I want to learn ...
2
votes
2answers
1k views
camera movement along with model
I am making a game in which a cube travels along a maze with the motive of crossing the maze safely. I have two problems in this.
The cube needs to have a smooth movement like it is traveling on a ...
2
votes
2answers
817 views
Multiplatform GLSL shader validator?
Im working on a multiplatform (Pc,Mac,Linux) game that uses shaders quite extensively. Since we do not have any funding, it is pretty hard to test our game on all possible hardware configurations.
...
1
vote
2answers
691 views
How to draw a smooth circle in Android using OpenGL?
I am learning about OpenGL API on Android. I just drew a circle. Below is the code I used.
public class MyGLBall {
private int points=360;
private float vertices[]={0.0f,0.0f,0.0f};
private ...
1
vote
4answers
502 views
searching for “university kind” free online course about OPENGL
I know there are a lot of free university courses, but I'm trying to find one about OpenGL.
Do you know where can I find one, online?
1
vote
1answer
154 views
Selection of a mesh with arbitrary region
Considering example:
I have a mesh(es) on the OpenGL screen and would like to select a part of it (say for delete purpose). There is a clear way to do the selction via Ray Tracing, or via Selection ...
1
vote
1answer
860 views
Zooming to point of interest
I have the following variables:
Point of interest which is the position(x,y) in pixels of the place
to focus.
Screen width,height which are the dimensions of the window.
Zoom level which sets the ...
1
vote
1answer
586 views
Translating local to global coordinates in ARToolkit / OpenGL
Ok, so I've tried reading over the other questions and something's just not clicking for me. I am working on an augmented reality application using ARToolkit, however it should just be straight ...
1
vote
1answer
3k views
OpenGL ES 2.0: Moving Camera in Orthogonal (2D) Projection
I have quite large 2D game scene. The scene is much larger than the screen of the LCD. Therefore, I have to move the camera (view) in desired directions, to display particular parts of the scene.
...
