A bitmap (raster image) used in a texture mapping process.

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0
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2answers
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How do I draw a point sprite using OpenGL ES on Android?

Edit: I'm using the GL enum, which is incorrect since it's not part of OpenGL ES (see my answer). I should have used GL10, GL11 or GL20 instead. Here's a few snippets of what I have so far... ...
5
votes
3answers
4k views

When should a bullet texture be loaded in XNA?

I'm making a SpaceWar!-esque game using XNA. I want to limit my ships to 5 active bullets at any time. I have a Bullet DrawableGameComponent and a Ship DrawableGameComponent. My Ship has an array of 5 ...
8
votes
7answers
7k views

Library to load images into textures, Linux, C and OpenGl

I am looking for simple, self-contained C library for Linux to load images from files into OpenGL textures. The licence should be quite liberal: zlib, bsd, mit or something. I have found SOIL, however ...
2
votes
2answers
5k views

OpenGL-ES: clearing the alpha of the FrameBufferObject

This question is a follow-up to Texture artifacts on iPad How does one "clear the alpha of the render texture frameBufferObject"? I've searched around here, StackOverflow and various search engines ...
3
votes
1answer
413 views

Hashing 3D position into 2D position

I am doing volumetric raycasting and curently working on depth jitter. I have 3D position on ray and want to sample 2D noise texture to jitter the depth. Function for converting (or hashing) 3D ...
4
votes
2answers
4k views

[Unity] Render an animated texture to a screen

I'm looking for a way to write a typed text on a texture, and then render it on a screen: in the game it's just the screen of a computer where a scientist is typing text on. The texture will be ...
2
votes
1answer
591 views

Doubt about texture waves in CG Ocean Shader

I'm new on graphical programming, and I'm having some trouble understanding the Ocean Shader described on "Effective Water Simulation from Physical Models" from GPU Gems. The source code associated to ...
29
votes
5answers
15k views

Should I use textures not sized to a power of 2?

In the early days of OpenGL and DirectX, texture sizes were required to be powers of two. This meant interpolation of float values could be done very quickly, using shifting and such. Since OpenGL ...
6
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3answers
1k views

Common light map practices

My scene consists of individual meshes. At the moment each mesh has its associated light map texture, I was able to implement the light mapping using these many small textures. 1) Of course, I want ...
10
votes
4answers
13k views

Preferred way to render text in OpenGL

I'm about to pick up computer graphics once again for an university project. For a previous project I used a library called FTGL that didn't leave me quite satisfied as it felt kind of heavy (I tried ...
8
votes
1answer
286 views

Is there any difference between storing textures and baked lighting for environment meshes?

I assume that when texturing environments, one or several textures will be used, and the UVs of the environment geometry will likely overlap on these textures, so that e.g. a tiling brick texture can ...
1
vote
1answer
506 views

GL_INVALID_OPERATION in glEnd

I'm having problems drawing a simple sprite. When I draw: void CSprite2D::render() { CHECKGL(glLoadIdentity()); CHECKGL(glEnable(GL_TEXTURE_2D)); ...
3
votes
1answer
2k views

Why does OpenGL seem to ignore my glBindTexture call?

I'm having problems making a simple sprite rendering. I load 2 different textures. Then, I bind these textures and draw 2 squares, one with each texture. But only the texture of the first rendered ...
2
votes
2answers
3k views

Texture2D.GetData fails to return pixel colour data

Because I'm using sprite sheets instead of an individual texture per sprite, I need to pass in a Rectangle when calling Texture2D.GetData() in my collision detection for per-pixel tests. ...
15
votes
3answers
8k views

What exactly is UV and UVW Mapping?

Trying to understand some basic 3D concepts, at the moment I'm trying to figure out how textures actually work. I know that UV and UVW mapping are techniques that map 2D Textures to 3D Objects - ...
2
votes
2answers
4k views

how disable texture after drawing an object?

i try to make a textured object then draw other without (only colored). i had tried to play with glEnable/Disable(GL10.GL_TEXTURE_2D) , ...
3
votes
1answer
2k views

Is it possible to import UV-maps in Unity3D without manually importing the associated texture?

When i import an object from Maya with a defined UV-map i have to manually import the texture (image) and assign it to the material. Is there a way to keep the materials texture reference from Maya ...
5
votes
3answers
2k views

Applying Textures to Hexagonal Tiles Seamlessly

I'm doing a tactical game (X-Com / Fallout style) for fun. I've decided to use a hexagonal map, but I'm having a graphic problem. My current map display is HUD-like, with only the border of the map ...
6
votes
4answers
7k views

How much memory does a texture take up on the GPU?

A large png on disk may only take up a couple megabytes but I imagine that on the gpu the same png is stored in an uncompressed format which takes up much more space. Is this true? If it is true, how ...
17
votes
4answers
4k views

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
votes
3answers
559 views

Skybox Development Help

I'm a freelance game designer, and I can't afford to hire someone to do skyboxes for me. However, I am unable to do them my self. Let's say I have a texture that can be tiled on four sides... If I ...
9
votes
3answers
1k views

Very slow direct3D texture sampling

So I'm writing a small game using Direct3D 9 and I'm using multitexturing for the terrain. All I'm doing is sampling 3 textures and a blend map and getting the overall color from the three textures ...
10
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2answers
221 views

Should the color of a texture be adjusted for display on a television?

If a 24bit RGB image with a range of 0-255 per channel is displayed on a television that displays a range of approx. 16-235 per channel, color detail will be lost, correct? If so, should images be ...
3
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2answers
1k views

Dump texture from memory to the original format?

How can you dump GPU memory (images and such that are loaded on it) to the standard format ?
9
votes
3answers
4k views

Premultiplied alpha, yea or nay?

Should I be using premultiplied alpha? Reading Tom Forsyth's article it seems a nobrainer. Premultiplied alpha (AKA additive blending) is superior in every sense. However, premultiplied alpha seems ...
30
votes
6answers
10k views

How can I make a good-looking explosion particle effect?

I'm not much of an artist, but I'm trying to make decent particle effects in a 2.5D game. I'm making a replica of Wii Play's "Tanks" and I can't quite get the explosions to look good. I'm not going ...
9
votes
2answers
830 views

Should the content pipeline tools be embedded in the engine?

How minimal should a games engine be? How much of the content pipeline should be embedded in the engine? Some use cases where the super engine might be useful: When loading user content, the user ...
3
votes
1answer
742 views

iPhone/OpenGL-ES partially texture mapping an object

I only have a basic understanding of OpenGL, so I'm probably showing my ignorance here. I'm looking for a great iPhone/OpenGL-ES example of applying a texture (preferably from a texture atlas, but ...
28
votes
9answers
20k views

Texture packing algorithm

What is a good texture packing algorithm? Technically, bin packing is NP-hard, so a heuristic is what I'm really after.
4
votes
4answers
1k views

How to handle font loading?

I need to display text in my game, who doesn't. I had originally thought that I could just statically render all the text I would need to images and use those. I'm starting to think that is a bad ...
14
votes
7answers
13k views

What are some cool examples of procedural pixel shader effects? [closed]

What are some good examples of procedural or screen-space pixel shader effects? No code is necessary; I'm just looking for inspiration. In particular, I'm looking for effects that are not dependent ...
6
votes
5answers
4k views

Non-destructive way to edit alpha channel in Photoshop/Gimp image

Looking to make textures for Unity3d, and I'm stuck at what seems to be a simple stage. My goal is to create an RGBA image, with color information for every pixel, and a separate alpha channel. These ...
18
votes
3answers
7k views

How does Megatexture work?

I've been thinking about developing a small engine not only to develop small experimental games, but also to serve as a base to test various rendering techniques and things like that. Right now I've ...
8
votes
3answers
835 views

What is a good method for coloring textures based on a palette in XNA?

I've been trying to work on a game with the look of an 8-bit game using XNA, specifically using the NES as a guide. The NES has a very specific palette and each sprite can use up to 4 colors from ...
22
votes
6answers
5k views

What happened to procedurally generated textures?

I recall some time ago that procedurally generated textures were becoming a big deal that a lot of people/companies were really interested in with some serious benefits (smaller deployments, ...
13
votes
5answers
4k views

Tools for generating texture atlases/sprites from source images? [closed]

Is there an industry standard file format for texture atlases? What are the apps that take a directory of images and turns it into a texture atlas png and a text file describing what's on it? This ...
12
votes
6answers
2k views

How can I create my own sky maps?

What are the methods/tools for generating realistic skies with clouds and atmospheric shading? FOSS alternatives and spherical projections get extra points.
13
votes
1answer
779 views

What is a texture atlas?

I've heard about this concept, but what is it?
257
votes
20answers
226k views

Where can I find free sprites and images? [closed]

I need sprites and images, such as characters, landscapes and others. Where can I find them?