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

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2answers
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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 ...
1
vote
1answer
345 views

2D map/plane with nodes overlayed that supports panning, scaling and clicking on nodes

I'm trying my hand at Android development and seem to be running into an invisible ceiling in trying to get what I want accomplished. Basically I'm trying to create an app that renders a 2D surface ...
0
votes
1answer
527 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 ...
5
votes
1answer
978 views

exporting bind and keyframe bone poses from blender to use in OpenGL

EDIT: I decided to reformulate the question in much simpler terms to see if someone can give me a hand with this. Basically, I'm exporting meshes, skeletons and actions from blender into an engine ...
0
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3answers
504 views

Simple iOS glDrawElements - BAD_ACCESS

You can copy paste this into the default OpenGl template created in Xcode. Why am I not seeing anything :-) It is strange as the glDrawArrays(GL_TRIANGLES, 0, 3); is working fine, but with ...
3
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2answers
2k 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 ...
3
votes
1answer
2k views

How do I generate mipmap .png and model .obj files for LibGDX?

I'm playing a bit with LibGDX (OpenGL ES 2.0 wrapper for Android). I found some sample code which used prepared files to load models and mipmap textures for them, e.g., at ...
2
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1answer
566 views

Bad FPS for smaller size (OpenGL ES with SDL)

If you saw my other question, well, there is still a little problem: Click here to watch on youtube Basically, the frame rate is very bad on the actual device, where for some reason the animation is ...
0
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1answer
654 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
198 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 ...
4
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2answers
2k views

How to send multiple MVP matrices to a vertex shader in OpenGL ES 2.0

I'm working my way through optimizing the rendering of sprites in a 2D game using OpenGL ES and I've hit the limit of my knowledge when it comes to GLSL and vertex shaders. I have two large float ...
3
votes
1answer
1k 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, ...
9
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4answers
14k views

What is the purpose of glScissor?

I know that it is more efficient than stencil test, but am I right assuming that the same functionality could be achieved using projection transformations with viewport?
2
votes
1answer
581 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 = ...
7
votes
4answers
4k views

Sprite Animation in Android with OpenGL ES

How to do a sprite animation in android using OpenGL ES? What i have done : Now I am able to draw a rectangle and apply my texture(Spritesheet) to it What I need to know : Now the rectangle shows ...
2
votes
0answers
138 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 ...
0
votes
1answer
151 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: ...
4
votes
2answers
874 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
1k 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 ...
2
votes
1answer
1k 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 ...
5
votes
5answers
1k 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 ...
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1answer
1k 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 ...
3
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1answer
553 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 ...
5
votes
2answers
2k views

Implementing fog of war in opengl es 2.0 game

Hi game development community, this is my first question here! ;) I'm developing a tactics/strategy real time android game and I've been wondering for some time what's the best way to implement an ...
1
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1answer
195 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: ...
6
votes
2answers
2k views

OpenGL 3.0+ framebuffer to texture/images

I need a way to capture what is rendered on screen, i have read about glReadPixels but it looks really slow. Can you suggest a more efficient or just an alternative way for just copying what is ...
1
vote
1answer
352 views

Offset Forward vector of object based on Rotation

I'm using the Bullet 3D physics engine in a iOS application running openGL ES 1.1 Currently I'm accepting info from the gyroscope to allow the user to "look around" a 3d world that follows a bouncing ...
3
votes
1answer
231 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 ...
0
votes
1answer
566 views

OpenGLES how to make a 3D object iOS

I am a newbie in OpenGLES, so pardon me if I cannot state the question properly. Is it possible to create a 3D box with the following imports only: OpenGLES, QuartzCore, GLKit I have created a 2D ...
5
votes
5answers
3k views

Should we always prefer OpenGL ES version 2 over version 1.x

OpengGL ES version 2 goes a long way into changing the development paradigm that was established with OpenGL ES 1.x. You have shaders which you can chain together to apply varios effects/transforms to ...
1
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3answers
137 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 ...
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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 ...
1
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1answer
179 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
2k 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
2k 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 ...
1
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1answer
426 views

Why do my pyramids fade black and then back to colour again [closed]

I have the following vertecies and norms GLfloat verts[36] = { -0.5, 0, 0.5, 0, 0, -0.5, 0.5, 0, 0.5, 0, 0, -0.5, 0.5, 0, 0.5, 0, 1, 0, -0.5, 0, 0.5, 0, 0, -0.5, 0, 1, 0, 0.5, 0, 0.5, -0.5, 0, ...
1
vote
2answers
912 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
1answer
131 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
3
votes
1answer
4k 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 ...
2
votes
1answer
114 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 ...
1
vote
2answers
414 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 ...
6
votes
1answer
2k views

OpenGL ES 2.0 Best Practices / Architecture Guide

I've recently started working with OpenGL (ES 2.0) on the Android. While there is lots of documentation about the basics, I can't seem to find much about the overall architecture of OpenGL. In ...
1
vote
1answer
1k views

Shader authoring/editing tools for GLSL ES

Since Render Monkey has been discontinued (perhaps due to the complexity of today's shading languages), there are few successors that can match its functionality. Is there any useful tool for material ...
4
votes
3answers
5k views

OpenGL ES and Screen Coordinates

Is there anyway I can make OpenGL ES 2.0 to accept coordinates (for Vextex for example) in int meaning the pixels instead of the default float system? Also how can I set the point (0,0) to be at the ...
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 ...
1
vote
2answers
3k 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() { ...
0
votes
1answer
154 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 ...
1
vote
1answer
566 views

Why is my mesh generation algorithm not working properly?

I am trying to generate a grid in OpenGL ES, using known methods for triangle strips and stitching as shown in: this post and this post The code below, generates the vertices for a 4x4 grid with a ...
1
vote
1answer
688 views

How to obtain contrail visual effect?

I have objects moving in OpenGL ES1 application. I want some of them to leave behind contrail – like if they would emit some radiation or something. EDIT: the kind of contrail is: light contrail – ...
1
vote
1answer
2k views

2D Quads : Translation with OpenGL ES 2.0 on Android [closed]

I have a simple 2D engine that renders 2D textured quads, and right now I can scale the quad or rotate it, but when I try to translate it I have a strange distortion (the quad is squashed in the half ...