Subset of the OpenGL 3D graphics API designed for embedded devices such as mobile phones.

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3
votes
4answers
585 views

Benefits of upgrading from OpenGL ES 1.1 to 2.0 on iOS

I have an animated 3D iPhone game that I first wrote using OpenGL ES 1.1 in late 2009. After many updates to the rest of the game, the OpenGL ES 1.1 code still runs fine under iOS 6, but I'm ...
7
votes
1answer
2k views

OpenGL ES create stencil effect using texture

Environment This is the environment I am working in: OpenGL ES 2.0 iPhone Simulator & iPhone 4 iMac 27" using NVIDIA GeForce GTX 680MX 2048 MB Hope that helps. The Problem Been searching ...
1
vote
1answer
357 views

Keeping Track of Position OpenGL

I have a sphere in my 3D world located at the origin. I have models orbiting it and I need to keep track of each models' position (x, y, x coordinates) as well as update their bounding boxes for ...
1
vote
2answers
391 views

Quaternion Camera

Can someone help me figure out how to use a Quaternion with the PerspectiveCamera in libGDX or in general? I am trying to rotate my camera around a sphere that is being drawn at (0,0,0). I am not sure ...
1
vote
1answer
2k views

How do I draw a scrolling background?

How can I draw background tile in my 2D side-scrolling game? Is that loop logical for OpenGL es? My tile 2400x480. Also I want to use parallax scrolling for my game. ...
1
vote
1answer
539 views

Using Quaternion in libGDX

Can someone give me an explanation about how to use the Quaternion class in libGDX to move my camera around a sphere or just set it up, manipulate it, and apply it general? I am trying to acheive ...
0
votes
1answer
349 views

Extra fire simulation on iPad device

I have with me an iOS app for iPad which creates a few fire simulations over a png.Well,its working well exactly how we wanted it but when we are testing it on a device,we get an extra fire ...
1
vote
1answer
431 views

Apply portion of texture atlas

I'm trying to write a shader that only maps a portion of a large texture to my sprite and I'm getting a strange behaviour with my current code. This is what I have right now: Texture atlas ...
0
votes
1answer
355 views

Android, apply a pixelshader on a canvas

Can an opengl pixelshader be applied on a Canvas? I want to render a bitmap on a canvas, then apply a pixelshader to get, for example, a blur effect. Is this possible? I don't want to simulate the ...
1
vote
2answers
816 views

How can I create a fast, real-time, fixed length glowing ray?

Similar to the disintegrate skill in Diablo 3. It should not light other objects in scene. Just glowing and animated. Like in this video http://www.youtube.com/watch?v=D_c4x6aQAG8. Should I use ...
3
votes
5answers
787 views

Should iOS games use a Timer?

No matter what frameworks we use -- Core Graphics, Cocos2D, OpenGL ES -- to write games, should a timer be used (for games that has animation even when a user doesn't do any input, such as after ...
3
votes
1answer
220 views

Book and resource about vanilla OpenGL ES 2.0 development

I found this book but it talks about an SDK created by the author rather than pure simple OpenGL ES 2.0; this sounds more like a commercial to me than a good book for programming. I would like to ...
3
votes
2answers
1k views

The purpose of using invert and transpose

In openGl ES and the World of 3D - why use the invers matrix? The thing is that I dont have any intuition to, why it is used, therefore please correct me: As fare as I understand, it is used in ...
6
votes
4answers
2k views

iPhone 3d Model format: .h file, .obj, or some other?

I'm beginning to write an iPhone game using OpenGL-ES and I've come across a problem with deciding what format my 3D models should be in. I've read (link escapes me at the moment) that some ...
0
votes
1answer
436 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; ...
2
votes
2answers
1k views

Cocos2d v2.0 and OpenGL 2.0/1.0: where to start

I started developing my very first game 3 months ago using Cocos2d 2.0 for iPhone. I am now in the stage where I'd like to add some cool effects to the bullets and some special weapons (see my ...
2
votes
2answers
187 views

how to render small texture on another texture?

can anybody help me to render small texture on another texture. i.e I have one background image, when user touches on the screen it should draw small(circle or any object) on it. can anybody suggest ...
3
votes
1answer
865 views

Z Order in 2D with orthographic projection and texture atlas

I am working with a 2D game in OpenGL ES and have a question about z-order together with a texture atlas. I am using an orthographic projection because I want pixel-perfect rendering of 2D sprites, ...
1
vote
3answers
2k views

How do I repeat a texture with GLKit?

I am using GLKit in order to show textures on my project. The code is like this: -(void)setTextureImage:(UIImage *)image { NSError *error; texture = [GLKTextureLoader ...
-5
votes
4answers
3k views

How to implement a 2d collision detection for Android

I am making a 2d space shooter using opengl ES. Can someone please show me how to implement a collision detection between the enemy ship and player ship. The code for the two classes are below: ...
1
vote
0answers
609 views

OpenGL ES multiple objects not being rendered

I am doing the following to render multiple balls move around the screen but only 1 ball is seen to appear and function. I don't know why the rest (count-1) balls are not being drawn public void ...
2
votes
1answer
471 views

cocos2d/OpenGL multitexturing problem

I've got a simple shader to test multitextureing the problem is both samplers are using same image as their reference. the shader code is basically just this : vec4 mid = ...
3
votes
2answers
1k views

Can I use PBOs for textures in iOS?

As far as I can see, there is no GL_PIXEL_UNPACK_BUFFER. Also, the OpenGL ES 2.0 specification (and as far as I know, no iOS device currently supports OpenGL ES > 2.0) states that glMapBufferOES() can ...
2
votes
0answers
129 views

Is there a way to export 3D objects with animation from Blender or any other app into OpenGL ES 1.1 code?

The problem is that all the examples I've found are obsolete or iOS/Android specific and not "pure" OpenGL ES 1.1. If anyone can provide me with a good example/tutorial/book it would be very much ...
1
vote
1answer
888 views

Sprite animation in openGL - Some frames are being skipped

Earlier, I was facing problems on implementing sprite animation in openGL ES. Now its being sorted up. But the problem that i am facing now is that some of my frames are being skipped when a bullet(a ...
1
vote
2answers
2k views

Trying to Draw a 2D Triangle in OpenGL ES 2.0

I'm trying to convert a code from OpenGL to OpenGL ES 2.0 (for the BlackBerry PlayBook). So far what I got is this (just the part of the code that should draw the triangle): void setupScene() { ...
1
vote
1answer
786 views

Rotate triangle so that its tip points in the direction of the point on the screen that we last touched

OpenGL ES - Android. Hello all, I am unable to rotate the triangle accordingly in such a way that its tip always points to my finger. What i did : Constructed a triangle in by GL.GL_TRIANGLES. Added ...
0
votes
1answer
149 views

Lighting get darker when texture is aplied

Im using OpenGL ES 1.1 for iPhone. I'm attempting to implement a skybox in my 3d world and started out by following one of Jeff Lamarches tutorials on creating textures. Heres the tutorial: ...
2
votes
4answers
639 views

How to create OpenGL (ES 1.0) texture programmatically?

I need to draw inside a buffer and then upload it as texture to OpenGL. So basicaly unsigned char* buffer and then call to glTexImage2D(). I will be using Marmalade mobile SDK and OpenGL ES 1.0.
3
votes
2answers
712 views

OpenGL sprites and point size limitation

I'm developing a simple particle system that should be able to perform on mobile devices (iOS, Andorid). My plan was to use GL_POINT_SPRITE/GL_PROGRAM_POINT_SIZE method because of it's efficiency ...
1
vote
1answer
771 views

openGL ES - change the render mode from RENDERMODE_WHEN_DIRTY to RENDERMODE_CONTINUOUSLY on touch [closed]

i want to change the rendermode from RENDERMODE_WHEN_DIRTY to RENDERMODE_CONTINUOUSLY when i touch the screen. WHAT i Need : Initially the object should be stationary. after touching the screen, it ...
1
vote
3answers
131 views

How to handle wildly varying rendering hardware / getting baseline

I've recently started with mobile programming (cross-platform, also with desktop) and am encountering wildly differing hardware performance, in particular with OpenGL and the GPU. I know I'll ...
5
votes
5answers
974 views

Which version of OpenGL for Android?

I've been trying to learn OpenGL ES 2.0 to create a simple 2D game. I bought a book on android development, but after seeing that the author uses his own SDK that implements OpenGL ES 1.0 I decided to ...
3
votes
1answer
471 views

how to do sprinkle effect of water in opengl in android?

I want to achieve sprinkling effect of water in android using opengl. so, do i need to achieve it with graphics? is there any other way to do it using opengl? or how can i start working on this,any ...
1
vote
1answer
164 views

Artifacts when draw particles with some alpha

I want to draw in my game some particles. But when I draw one particle above another particle, alpha channel from this above "clear" previous drawed particle. I set in OpenGL blend in this way: ...
0
votes
2answers
526 views

Help with Meshes, and Shading

In a game I'm making in LibGdx, I wish to incorporate a ripple effect. I'm confused as to how I get access to the individual pixels on the screen, or any way to influence them (apart from what I can ...
11
votes
6answers
11k views

OpenGL ES 2.0: Repository of Quality Shaders

Could I kindly ask, to suggest me a repository of high quality OpenGL (OpenGL ES 2.0) vertex and fragment shaders, please? I am looking for pixel based ligting shaders (such as phong) and simmilar. ...
1
vote
2answers
700 views

What is the best way to store meshes or 3d models in a class

I am wondering, how I should store my mesh into memory after loading it from whatever file. I have Questions floating in my head: Should a mesh could have sub meshes or does the 3d model just store ...
0
votes
1answer
153 views

Writing a basic shader for large input files

I started writing a shader for my iOS app and instead of starting from scratch i used this tutorial here: http://www.raywenderlich.com/3664/opengl-es-2-0-for-iphone-tutorial I wrote an import ...
13
votes
1answer
2k views

Should I distribute shaders in a compiled form or in plain text?

Having an application that uses shaders that have been wrote in GLSL, what is the best strategy for the distribution in the real world and for the desktop and mobile? I'm aiming to distribute this in ...
0
votes
3answers
5k views

2D Rendering with OpenGL ES 2.0 on Android (matrices not working)

So I'm trying to render two moving quads, each at different locations. My shaders are as simple as possible (vertices are only transformed by the modelview-projection matrix, there's only one color). ...
1
vote
1answer
173 views

if a desktop machine supports OpenGL 3.0+ I can assume that it supports OpenGL ES 2.0 too?

This isn't clear for me, if i use the drivers from the GPU manufacturer and they support OpenGL 3.0 and/or above, i can always make an OpenGL ES 2.0 application work?
0
votes
1answer
1k views

Reducing Memory Use on OpenGL ES

I'm using an opengl es based framework to create my game.I have an out of memory problem on some devices.I have 15 textures with a size 1024x1024(totally 10 mb).On memory they covers a lot of ...
2
votes
3answers
1k views

glGetFloatv – should it be avoided? Can it be replaced?

Platform is OpenGL ES 1.x. I am using glGetFloatv() to get MODELVIEW matrix. This allows me to compute points, where I need to draw a shadow effect. This is very handy, as I can forget about ...
0
votes
1answer
128 views

android opengl-es spritesheet display number

Whats the best way to display numbers on android with opengl using a spritesheet? I like to display the number "294" using the spritesheet: http://i.stack.imgur.com/wv5Zh.png
1
vote
2answers
753 views

Android OpenGL textures sometimes corrupted

Just trying to get some sprites (textured squares) to draw from a texture atlas and 50% of the time after the application is first launched/ reorientated/ brought from sleep these various graphical ...
0
votes
2answers
427 views

Can I dynamicaly modify 3D objects?

I am new to OpenGL, I am able to render a model object (a human model) that is using .obj and .mtl file in iOS. Now I want to make a modification to the loaded model. For example, I want to change ...
3
votes
1answer
3k views

Sea water shader using only fragment processor

I have a game that runs on mobile devices (OpenGL ES 2.0) and for which I would like to create some sea water using the shaders. Now, the plane on which the sea water texture will be has only 4 ...
1
vote
2answers
392 views

Lights system with shaders in OpenGL?

In more than just 1 occasion, i read about 2 ways of doing a light's system in OpenGL: normal way? i don't know how to call this one with the shaders ( GLSL ) The problem is i don't get the ...
2
votes
1answer
110 views

Touch point on the near plane

I have a matrix created with either orthoM or frustumM GL function, where the near plane is logically the surface of the tablet. I would like to translate touch locations to their location on the near ...