Tagged Questions
1
vote
1answer
142 views
Selecting and moving object in OpenGL Gameplay3D Engine
I'm using Gameplay3d as a game engine to develop a simple board game. PEG Solitaire
I've come to the part where I've created a 2D grid for all the movable object, empty locations and also where it's ...
2
votes
2answers
278 views
Does my 2D OpenGL renderer need optimized?
I've started a game engine for learning purposes. I have successfully gotten an opengl renderer working and I can draw textures of varying sizes to the screen. The way I have done this is by creating ...
0
votes
1answer
84 views
Can I use multiple OpenGL version together
I want to use GLSL but keep my current OpenGL 1.1 setup. The thing is that can I use OpenGL 2.0 shaders on OpenGL 1.1 renders?
0
votes
0answers
80 views
Opengl binding shaders vs binding buffers performance
Quick question for an opengl guru, I'm in the process of building a render queue and can either reduce the number of shader binding or the number of vertex buffer binding. I just want to know which ...
0
votes
1answer
156 views
OpenGLES GLSL Shader attributes always bound to 0
So I have a very simple vertex shader as follows
#version 120
attribute vec3 position;
attribute vec3 inColor;
uniform mat4 mvp;
varying vec3 fragColor;
void main(void){
fragColor = inColor;
...
0
votes
1answer
130 views
Objects won't render when Texture Compression + Mipmapping is Enabled
[EDIT: FIXED - Calling setting texture max level fixed that]
I'm optimizing my game and I've just implemented compressed (DXTn) texture loading in OpenGL. I've worked my way removing bugs but I can't ...
0
votes
1answer
192 views
Engine and level of detail for maze / labyrinth / dungeon scene?
My question is similar to these:
Algorithm for generating a 2d maze
To scene graph or not to scene graph?
I.e. in this case should I use jme3 or some other engine (I heard unreal offers a free ...
8
votes
4answers
1k views
Fixed-Function vs Shaders: Which for beginner?
I'm currently going to college for computer science. Although I do plan on utilizing an existing engine at some point to create a small game, my aim right now is towards learning the fundamentals: ...
3
votes
2answers
2k views
How many textures can usually I bind at once?
I'm developing a game engine, and it's only going to work on modern (Shader model 4+) hardware. I figure that, by the time I'm done with it, that won't be such an unreasonable requirement.
My ...
5
votes
2answers
706 views
Sorting objects before rendering
I'm trying to implement a scene graph and in all the articles i've come across there is talk about object sorting. So you'd sort your objects by "material" for example. Now untill i sat down and ...
4
votes
1answer
837 views
GLSL default shaders
I've been arming my engine with error checking code. I'll try to describe this situation to my best abilities. Whenever i load a shader and there's an error (file doesn't exist, compilation error, ...
0
votes
2answers
244 views
GLSL shader compilation
When i'm compiling a shader does it have to be complete? Can i use glCompileShader on a shader without a main() function? The OpenGL reference documentation has a nice writeup on program linking ...
0
votes
1answer
122 views
handling buffers in OpenGL
I'm reading through the OpenGL docummentation for version 3.3 core. I'm having issues understanding proper buffer deletion.
ATM i have an object that loads itself into OpenGL memory in the ...
-3
votes
1answer
244 views
Getting the normals of a hemisphere?
I'm trying to calculate the normal for a hemisphere.
I draw the hemi-sphere by this code:
for(float phi = 0.0; phi < 1.567; phi += factor) {
glBegin(GL_QUAD_STRIP);
for(float ...
5
votes
1answer
392 views
Difference between the terms Material & Effect
I'm making an effect system right now (I think, because it may be a material system... or both!). The effects system follows the common (e.g. COLLADA, DirectX) effect framework abstraction of Effects ...
4
votes
3answers
3k views
Should I use Game Engines to learn to make 3D games?
HI i am a software engineering student in his second-last year.
I am proficient with C,C++,C# and java programming languages, and being a student of engineering I have studied calculus, vectors etc ...
3
votes
1answer
805 views
How can I create an orthographic display that handles different screen dimensions?
I'm trying to create an iPad/iPhone game using GLES2.0 that contains a 3D scene with a heads-up-display/GUI overlaid on the top. However, this problem would also apply if I were to port my game to a ...
5
votes
3answers
1k views
Draw contour around object in Opengl
I need to draw contour around 2d objects in 3d space. I tried drawing lines around object(+points to fill the gap), but due to line width, some part of it(~50%) was covering object. I tried to use ...
-2
votes
3answers
266 views
Having a hard time finding a graphic engine programmer [closed]
I'm looking for a graphic engine programmer that knows both OpenGL and software rendering code to hire for a very short period (2 days). It's urgent and I'm willing to pay a very high amount of money. ...
5
votes
2answers
667 views
OpenGL 2 and back vs 3 and forward: What are the key differences for 2D graphics?
OpenGL contexts before and after OpenGL 3.0 are rather different. So far I've really only worked with buffers on either side anyway, I do know the most notable difference is lack of Immediate Mode.
...
1
vote
3answers
344 views
How to find the bottleneck of the graphical pipeline
I've been wondering about this issue for a while. How to find the bottleneck of the graphical pipeline. Recently I've been using a program to draw massive amount of polygons in a simple scene with ...
1
vote
1answer
2k views
OpenGL 3D Camera
And here I am again, looking for help with my OpenGL camera once again. This is starting to get embarrassing. Anyway, here's the deal: I think my OpenGL First Person free roaming camera is starting ...
13
votes
4answers
3k views
Real time shadow casting in a 2D isometric game
I'm writing a small 2d isometric engine in C++ and I'm trying to implement real time shadow casting. I followed a simple approach described on this page and here is the result (light is located at the ...
6
votes
1answer
898 views
Rendering 2D grass
My current project, using Java and OpenGL, has a fairly standard overhead tilemap in the style of the Zelda games.
I'd really like to add "real" grass to the grass tiles so that there are actually ...
3
votes
3answers
5k views
OpenGL ES 2.0: Vertex and Fragment Shader for 2D with Transparency
Could I knindly ask for correct examples of OpenGL ES 2.0 Vertex and Fragment shader for displaying 2D textured sprites with transparency?
I have fairly simple shaders that display textured polygon ...
2
votes
2answers
883 views
OpenGL ES 2.0: Picking Individual Polygon Sprites from within VBO
Say, I send 10 polygon pairs (one polygon pair == one 2d sprite == one rectangle == two triangles) into OpenGL ES 2.0 VBO. The 10 polygon pairs represent one animated 2D object consisting of 10 ...
6
votes
2answers
2k views
OpenGL ES 2.0: Using VBOs?
OpenGL VBOs (vertex buffer objects) have been developed to improve performance of OpenGL (OpenGL ES 2.0 in my case). The logic is that with the help of VBOs, the data does not need to be copied from ...
17
votes
4answers
9k views
Vertex Array Object (OpenGL)
I've just started out with OpenGL I still haven't really understood what Vertex Array Objects are and how they can be employed.
If Vertex Buffer Object are used to store vertex data (such as their ...
6
votes
2answers
580 views
OpenGL or OpenGL ES
What should I learn? OpenGL 4.1 or OpenGL ES 2.0?
I will be developing desktop applications using Qt but I may start developing mobile applications in a few months, too. I don't know anything about ...
3
votes
3answers
648 views
Can you sync screen update on vertical retrace with OpenGL?
In OpenGL, is there a way to ensure I get exactly, no more nor less, 60 (or whatever rate my monitor is set for) frames per second?
Of course given that the new frame can be calculated in less than ...
