OpenGL draw texture on texture(?)

Question

0.00/5 (No votes)

See more:

Hi,

I am currently trying to develop a 2D game, but I came through a little problem. I would like to hear some answers from the experienced game developers.

So let's say I have a wall texture. A player shoots a bullet on it, then how do I draw the bullet texture on that wall texture? Later if I want to use the same texture, how do I use that exact same wall texture (without the bullet) on another wall object?

How do game developers usually do this?

Posted 5-Jan-13 0:50am

velvet7

Updated 5-Jan-13 3:38am

v2

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Santhosh G_ · Answer 1 · 2013-01-09T07:42:00

Solution 1

I'm not a game developer, but I'm trying to answer your question.

There are different methods to display the above scene.
Before preparing your scene you can place all objects in proper place.

Quote:
A player shoots a bullet on it, then how do I draw the bullet texture on that wall texture?

My suggestion is to redraw the scene with the background scene(wall) and bullet. You can retain the wall texture without any change. Draw objects(bullets) on top of backbground(wall).

DrawScene()
1. Draw Wall Texture.
2. Draw Bullets( this drawing will be on top of wall ).

Posted 9-Jan-13 7:42am

Santhosh G_

Comments

JackDingler 9-Jan-13 15:14pm

That's essentially it.

the technology you're looking for is called, 'decals'.

velvet7 9-Jan-13 15:32pm

This is exactly what I tried to do. The problem comes when I try to draw on the boundary of the wall. So imagine it like this:
*
---***-
| * |
| |
-------

Where the * is the bullet texture. Basically it draws "in the air", which I want to avoid.

JackDingler 9-Jan-13 17:20pm

Research 'decals'. Its a technique for overlaying one texture on top of another. It has been developed to do exactly what you want.

There's no quick answer for this, but it's a common technique and many articles have been written on it.