I'm trying to build a (simple) game engine using c++, SDL and OpenGL but I can't seem to figure out the next step. This is what I have so far... An engine object which controls the main game loop A scene renderer which will render the scene A stack of game states that can be pushed and popped Each state has a collection of actors and...
How exactly would one go about getting an OpenGL app to run fullscreen straight from the terminal (Ubuntu Server 9.04)? I've developed an application for visual diagnostics on my server, but, I'm not totally sure the best way to get it to run in a windowless environment. Ideally, I would run my program: ./visualdiagnostics and have...
Basically, given a quaterion (qx, qy, qz, qw)... How can i convert that to an OpenGL rotation matrix? I'm also interested in which matrix row is "Up", "Right", "Forward" etc... I have a camera rotation in quaternion that I need in vectors... Thanks! ...
Hello, Me and my friend are trying to accelerate a 2D game with OpenGL. The video chipset is Radeon X1250 which seems to be underpowered and can display up to some 80 1366x768 full frames/s. Given that we are drawing many sprites on top of each other the performace drops dramatically under the 60 FPS we are targeting at. Could you pleas...
This is a homework question I am sorry but I am lost. What happens is the following I am asked to do a tiling of hexagons. Like the grid map in many Risk games and Wild Arms XF. I understand the current transformation is the matrix that translates the points I give to OpenGL to screen coordinates and if you apply a transformation it move...
I am wanting to code something with OpenGL, but I don't want to have to go through Windows API, is this Possible? If so then some links to tutorials on how to do this would be nice. ...
What OpenGL / GLUT reference is the best around? Ideally I'm looking for something with C++ sample code to help me learn OpenGL as well as details about the APIs similar to what MSDN provides for .net programming. If there isn't a one stop shop, then please list the set of references I should use and what the strengths of each one is. ...
Imagine the following scenario: you have a set of RPG character spritesheets in PNG format and you want to use them in an OpenGL application. The separate characters are (usually) 16 by 24 pixels in size (that is, 24 pixels tall) and may be at any width and height without leaving padding. Kinda like this: I already have the code to d...
I'm looking for a free to use game engine math library. Specifically I'd like a good matrix and vector implementation. And everything needed to move objects in 3D space. Does anyone know any good ones? I'm targeting OpenGL. I'd like to write them myself but don't have the time LOL. ...
Hello, About half of my meshes are using triangles, another half using triangle fans. I'd like to offload these into a vertex buffer object but I'm not quite sure how to do this. The triangle fans all have a different number of vertices... for example, one might have 5 and another 7. VBO's are fairly straight forward using plain tri...
I'm working with QGLWidget (Qt widget for OpenGL) and want to be able to capture the screen displayed by the widget as JPEG files. How can I achieve this? Is there a function that return what is currently displayed on the widget as an image? ...
Hi, I'm currently writing an application that actually acts as a "cut" tool for 3D meshes. Well, I had some problems with it now which I am clueless on how to solve, since it is my first application. I have loaded a model from an object file onto the canvas, then on the same canvas, I use the mouse drag event to draw lines to define t...
I've been using OpenGL ES 1.1 on the iPhone for 10 months, and in that time there is one seemingly simple task I have been unable to do: programmatically fade a textured object. To keep it simple: how can I alpha fade, under code control, a simple 2D triangle that has a texture (with alpha) applied to it. I would like to fade it in/out w...
I am trying to make a stereo window in QT--I seem to be lost in the interaction of QT and OpenGL. I have set the stereo context in my GL initialization code QGLFormat fmt fmt.setStereo(true) and when I check the value, it comes back true. I then draw into the GL_BACK_LEFT and GL_BACK_RIGHT buffers (I have also tried just GL_LEFT an...
Hello, I need to get an up vector for a camera (to get the right look) from a roll, pitch, and yaw angles (in degrees). I've been trying different things for a couple hours and have had no luck :(. Any help here would be appreciated! ...
This should be really simple, but it's consumed multi-hours of my time, and I have no clue what's going on. I'm rendering a flat-colored full-screen quad to a texture, then reading back the result with glGetTexImage. It's GPGPU related, so I want the alpha value to behave as if it's any of the other three. I'm using an FBO, texture form...
I usually create a pixel format using wglChoosePixelFormatARB() with these arguments (among others): WGL_DOUBLE_BUFFER_ARB = GL_TRUE WGL_SAMPLE_BUFFERS_ARB = GL_TRUE WGL_SAMPLES_ARB = 4 i.e. doubke buffering on and x4 multi sampling. This works just fine. But when I try to turn of the double buffering: WGL_DOUBLE_BUFFER_ARB = GL_FALS...
I am trying to translate an OpenGl object around in a helical pattern. I cannot figure this out. Problem is I know I need to increment the angle for the x, y, and z coordinates, but the translate function that I use only moves the object by a translate amount which is specific to the object. The Axis I am using is Y up, Z toward the scre...
I have a Java Application that uses JOGL to provide a large part of the GUI. Is there any tool which you know of, or have used which can automate the testing of OpenGL applications (or more specificly those using JOGL) Just to update: The tool can run on either linux or windows. ...
I am trying for the first time to render to a texture using openGL ES (for iPhone) and then display the texture on the screen. Everything works except that there is a 32 row gap at the top of the texture and the bottom 32 rows are cut off. It's like all of my drawing is being offset 32 pixels down, which results in the bottom 32 rows not...