Questions tagged [opengl]

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 applications like CAD software and computer games. It is also cross-platform. The OpenGL standard is controlled by the Khronos group, which also controls OpenGL ES.

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4
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1answer
3k views

OpenGL clipping plane

I need to move clipping plane of OpenGL and begin the clipping from that position. The default location of clipping plane is (0,0,0), so if my model is far enough from the center of coordinate system ...
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3answers
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Optimizing Octree Rendering

Say I have an octree and at a certain level I store VBOs in that octree. I know the dimensions of of the nodes that own the vbo so I can do basic frustum culling. That works nicely because everything ...
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6answers
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AAA Games and OpenGL? [closed]

What modern AAA games on the top of the market used OpenGL? If applicable, what engine did they use?
2
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1answer
488 views

ATI driver bug and rendering to a texture 2d array in OpenGL

I am trying to render to a texture2Darray in OpenGL, with a similar setup as descriped in this post. My question is, if anyone has gotten this to work on ATI ...
2
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1answer
592 views

Problem with arcball

I making graphics viewer, and I want to use "arcball" to manipulate object. I using OpenGL + CML ( for math ). My arcball don't want work, it is skewing not rotating :/ And I don't know why, I use ...
4
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4answers
32k views

Starting programming in 3D with C++ [closed]

EDIT: There aren't sufficient enough tutorials for what I'm trying to do in Python, so I'm going to take my time and slowly build up my skills in C++. It's hard to trip and not land in a book of C++ ...
4
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2answers
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Blending 2d images to subtract alpha

I'm looking into doing a 2d lighting system with a result similar to this: http://forums.tigsource.com/index.php?topic=15619.0 This thread I believe disregards color, as well as doesn't really list a ...
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4answers
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What's wrong with this OpenGL model picking code?

I am making simple model viewer using OpenGL. When I want to pick an object OpenGL returns nothing or an object that is in another place. This is my code: ...
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2answers
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3D game special effects, fire, lightning, water, and ice [closed]

I'm working on a 3d game using OpenGL and would like to take it in a fantasy direction. Specifically I'm thinking of having magic with effects for fire, water, ice, and lightning. My problem is I ...
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2answers
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How to Make A Fast Graphics Engine? [closed]

Assuming I were to develop a graphics engine for a modern PC game that used only DirectX or OpenGL, which techniques could I use to make sure it ran quickly? Edit: I'm looking for any approaches ...
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4answers
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Procedural Planets, Heightmaps and Textures

I am currently working on an OpenGL procedural planet generator. I hope to use it for a space RPG, that will not allow players to go down to the surface of a planet so I have ignored anything ROAM ...
3
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6answers
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What is the easiest and shortest way to draw a 2d line in c/c++?

I am fairly new to c/c++ but I do have experiance with directx and opengl with java and c#. My goal is to create a 2d game in c with under 2 pages of code. Most of what I have seen requires 3 pages of ...
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2answers
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Is there an efficient, available online, algorithm for converting a matrix of squares into a triangle strip?

Imagine having a 4x4 square, with 16 smaller squares inside of it, with associated data on what the squares should look like (ie., opacity, colour, etc...). Is there an existing, efficient, algorithm,...
3
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1answer
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State of art shadowing technique for OpenGL on isometric terrain?

What's the most efficient way of creating shadows for object on a isometric terrain with OpenGL and JOGL? Note that this terrain is not flat and is not heightmap generated. Think it as another model. ...
6
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2answers
768 views

GL_EXT_draw_instanced vs VBO's

I'm having trouble understanding the benefit of the newer GL_EXT_draw_instanced over traditional VBO's. Don't both keep geometry cached on the gpu for faster redrawing? VBO's seem much more flexible....
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1answer
873 views

Motion blur is blurring static stuff

I made a motion blur using OpenGL immediate mode, basically it involves saving screen to texture, then rendering blended texture back (let's skip the details) with something like this: ...
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3answers
1k views

What's the best open source physics engine to use with JOGL? [closed]

I have a past with jbullet but the existing jogl compatible sources and demos seems uncompleted. I have managed to implement it to an extent but still looking for a better documented engine with more ...
4
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3answers
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What resources are available for Mac OS game development?

Are there are any modern resources on how to develop games for Mac OS? I suppose this would include objective c, cocoa and opengl 3+. The book Beginning Mac OS X Game Development with Cocoa looks ...
66
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9answers
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Good GUI for OpenGL? [closed]

I am starting to learn OpenGL with FreeGLUT using the Superbible and the knowledge I have from my elementary graphics to brush up on my skills. To get more from this experience I want to integrate a ...
19
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6answers
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OpenGL wireframe

No, I'm not looking for glPolygonMode. I'm searching for a method, possibly a GLSL shader that would produce that retro-style wireframe look for objects. Any suggestions? Something like Vector Tanks ...
3
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2answers
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Which 2D rendering algorithm is the most suited for mobile devices?

Which 2d rendering algorithms are popular for mobile game engines (specifically Android) and why? Are the same ones for the desktop and/or console world as effective here?
15
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1answer
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How can I tell how much video card memory I'm using?

I want to programmatically determine at runtime how much video card memory is being used by my program. Specifically I'm wondering about how to do it on a Windows machine using OpenGL, but am ...
4
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2answers
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Lighting Objects with Textures - OpenGL

I'm trying to get lighting effects on a textured object; I'm using .obj and .mtl files to define them. No matter what I try my object is either invisible, unlit (plain texture), or completely white. ...
3
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2answers
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Methods to 'cull check' polys in OpenGL

A quick search through the web suggests there's quite a few methods of potentially detecting back-culled faces on the CPU. The purpose of the check is to evaluate whether to performing other ...
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4answers
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Geometric Transformations on the CPU vs GPU

I've noticed that many 3d programs normally do vector/matrix calculations as well as geometric transformations on the CPU. Has anyone found an advantage in moving these calculations into vertex ...
3
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1answer
431 views

What is the right process to get compatibility or at least a workaround for the ‘Threaded optimization’ feature of NVIDIA?

It's peculiar this issue is not well understood on NVIDIA forums and project forums. For example, the well known ioquake3 project based on id tech 3 requires to force 'Threaded optimization' off on ...
2
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1answer
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Post processing texture sizes

I'm trying to write some code to do post processing in OpenGL ES2 on the iPhone. All is fine an dandy, except I am having trouble working out how to scale the texture rendered in the rendering step, ...
14
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4answers
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Getting a texture from a renderbuffer in OpenGL?

I've got a renderbuffer (DepthStencil) in an FBO and I need to get a texture from it. I can't have both a DepthComponent texture and a DepthStencil renderbuffer in the FBO, it seems, so I need some ...
2
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1answer
3k views

Draw multiple LINE_LOOPs in one glDrawElements call

The game I'm working on has OpenGL (2.1) vector graphics, and I need to draw up to 1000 enemies, each of which is composed of between 4 and 100 lines. Each enemy can be drawn as a single line loop, ...
3
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2answers
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Camera rotation (OpenGL)

I am having trouble with a camera class I am trying to use in my program. When I change the camera_target of the gluLookAt call, my whole terrain is rotating instead of just the camera rotating like ...
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1answer
948 views

OpenGL FBO Rendering

I'm getting some artifacts when I try to use a colour attachment on an FBO. I'm saving my first pass as a texture, then passing it as an input to an anti-aliasing shader. The result is, as below, some ...
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7answers
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Can I develop Linux + Windows games using C#, .NET and OpenGL?

I want to learn to develop 3D and 2D graphics with either OpenGL or DirectX. I chose OpenGL as it's being used in webGL and works cross-platform. I already know .NET well, and the C# language just ...
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2answers
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How to tell if a glut window has focus from c#

How can I tell if a glut window has focus? Im using c#/tao, Ill use p/invokes if necessary. Basically I want to ignore input if it doesn't have focus.
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1answer
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GLSL shader without a vertex array

Ok so I have a idea for a neat GPU driven curve renderer, and I realised that the vertex shader can be hardwired to generate points of the curve segment (to be rendered as a line strip) without ...
5
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2answers
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Atmospheric Scattering

I want to add some nice atmospheric scattering to my 3D game engine but I am very concerned with conserving resources. I am not very familiar with how its done but can someone please give me some ...
18
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3answers
8k views

Upgrade OpenGL version on Windows?

How do I update the version of OpenGL on Windows so that I can use anything newer than the Version 1.1 header file that is included in the Platform SDK? Even version 7.0A of the SDK for Windows 7 ...
8
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2answers
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Frustum Culling with VBOs

I have terrain being rendered in my project using VBOs in OpenGL. I would like to apply some Frustum Culling but have no idea how to access each polygon as its drawn to check if it is in view. I think ...
3
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2answers
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Expected OpenGL performance

I'm benchmarking some simple code for drawing using OpenGL. In the following code, the number of indices being drawn is 4,644 (or 1,548 triangles per frame = @60fps 92,880 Triangles per second). <...
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8answers
23k views

Getting Started with 2d Game Dev (C++): DirectX or OpenGL? [closed]

So, i'm a student looking to get my foot in the door of game development and im looking to do something 2D, maybe a tetris/space invaders/something-with-a-little-mouse-interaction clone. I pointed ...
19
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12answers
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3D theory before graphics APIs? [closed]

I'm a software engineer and I'm hoping to move my career towards game development. I'm reading a book right now on 2D using C++/DirectX. When I get into 3D I know I want to do it correctly. For ...
8
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5answers
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Is there a way to blur objects in a 2d game with OpenGL without using shaders?

Is there a nice way in OpenGL to blur objects without using shaders? Currently, I'm accomplishing blur by rendering the object slightly up, down, left, right, and the four diagonals from its original ...
23
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3answers
1k views

Do I need to learn C++ to use Open GL?

Do I need to learn C++ to use Open GL?
12
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7answers
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Fastest way to create a simple particle effect

I am looking to the fastest way to create really simple particle effect that will be spammed like hell on the game... Basically, my game looks like a vectrex game, made mostly of lines... I want to ...
44
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10answers
21k views

Is learning OpenGL 2.1 useless today?

I'm new to 3D OpenGL/DirectX world and I found out that OpenGL 4.1 and GLSL specifications were just released today. A friend of mine gave me the Red Book for OGL v2.1 but, as far as I've read, 3.x ...
5
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5answers
835 views

What are some low-level performance tweaks for iPhone games written in c?

I'm interested in some performance tweaks for a relatively simple OpenGL ES based 2D iPhone game. What performance tweaks have you found? The performance of the game is pretty good on most devices (...
24
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7answers
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How to get PS3/Xbox 360 experience without having access to Dev kits?

I am a budding game programmer trying to get into the industry programming for PS3, Xbox 360. The main problem I see is the need to demonstrate my skills to a potential employer, but without access ...
3
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2answers
681 views

OpenGL: Precompute a texture rotation

I'm trying to speed up particles, and one way to do that is by precomputing the texture rotations. What I want to do is load the texture, rotate it and save it to a handle. How would I go about doing ...
88
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15answers
52k views

What are some good learning resources for OpenGL? [closed]

I have been using the OpenGL ES on the iPhone for a while now and basically I feel pretty lost outside to the small set of commands I've seen in examples and adopted as my own. I would love to use ...
26
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9answers
18k views

OpenGL optimization tips [closed]

What tips or tricks do you have when it comes to making the OpenGL more efficient?
6
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3answers
1k views

How can I get into opensource game development? [closed]

The short and sweet question I'm new to game programming in general, so how do I go about making GOOD QUALITY opensource games? What I have come across There are a multitude of games that I have ...