OpenGL ES 2.0 emphasizes a programmable 3D graphics pipeline (comparing to fixed-function pipeline of OpenGL ES 1.1).

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7
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1answer
1k views

Optimizing performance of a heavy fragment shader

I need help optimizing the following set of shaders: Vertex: precision mediump float; uniform vec2 rubyTextureSize; attribute vec4 vPosition; attribute vec2 a_TexCoordinate; varying vec2 tc; ...
3
votes
2answers
697 views

OpenGL ES 2.0: Enabling hi-res on iOS

I created an empty iOS project and then added a custom GLView class which is then added to AppDelegate. I have following questions: 1) How do I enable hi-res retina mode on iPhone 4? Currently I am ...
6
votes
1answer
779 views

Android game loop's effect on cpu/battery usage - unexpected results

I will try to keep this question as concise and as readable as I can. I recently came across an odd problem with my Android game that I'm developing. It's an openGL ES 2.0 game and initially I was ...
0
votes
0answers
249 views

How to render alpha channeled animated 2D sprites in OpenGL ES 2.0 [duplicate]

I searched, but I can't find specifically how to render animated 2D sprites with an alpha channel onto a 3D polygon, z=0, in OpenGL ES 2.0. This is just a basic 2D concept, but since I'm using, ...
1
vote
1answer
74 views

I have a frag shader, one with an empty s_lightMap, how and why is it effecting the output?

I have an image of concrete rocks of different shades of colors, and I'm applying this shader, but without referencing s_lightMap's uniform in my program: precision mediump float; ...
1
vote
1answer
392 views

Centering GLViewport position within physical screen

I'm developing my app on one device and want it to display at the same ratio on all other devices. Currently what I have is 'image 1' in my image below - the game fits perfectly onto my development ...
-1
votes
1answer
96 views

Specifying 3D objects in a game [closed]

I have hands on experience in OpenGLES 2.0 , OpenGL and wish to apply the same in a 3D game development in Android. My idea is to develop a Combat game having fighter planes. I am trying to create a ...
1
vote
2answers
535 views

Calling glGetError() in release builds?

Currently, I'm calling glGetError() after each OpenGL function call in order to be able to detect and report bugs. I've been reading that glGetError() calls should be reduced to once per frame in ...
0
votes
1answer
618 views

iOS OpenGL ES 2.0 How to Billboard on Sphere and Rotate with Sphere

I have a sphere (earth) in OpenGL ES 2.0 for iOS. I also have markers that I want to place at lat/lons on the earth - but I want the markers to always face the user ( billboards ) but also move with ...
0
votes
1answer
221 views

bump mapping with 2 normal maps

I was wondering if its actually possible to do bump mapping with 2 normal maps... I have tried doing it this way however I get a function overload on max and dot. uniform sampler2D n_mapTex; uniform ...
0
votes
1answer
151 views

texture movement stutters

Hey I at the moment I have got my texture to move however it stutters as I increment by 0.001 every second. My animation is done via FPS if that make sense and here is some code FrameCount++; ...
0
votes
1answer
288 views

texture won't move OpenGL ES 2.0

I want be able to move my texture in GLSL I have set my texture to wrap S and wrap T but not sure why it wont move my fragment shader looks like this at the moment uniform sampler2D n_mapTex; ...
1
vote
1answer
570 views

How would one render dynamic vertices in OpenGL ES 2.0 like in a 3D modeling program?

Is there an easy way to re-render dynamic vertices in OpenGL ES 2.0 so that one could, for example, make a modeling program? I understand how to make a dynamic vertex array, but what I don't ...
-1
votes
1answer
299 views

How can one make multiple movable images in OpenGL ES 2.0? [closed]

I was wondering, I've only seen examples of OpenGL ES 2.0 where people have used one or perhaps two images. I didn't see multiple images of where they each had independent movement. What if someone ...
1
vote
1answer
107 views

in an ios open gl es 2 game - is it better to use a few large texture atlas or many small textures

I'm working on new game, this time moving to more 3d objects and open gl es 2. Previous (successful) game was open gl es 1 and mostly 2d. For es 2 I'm developing my own 3d engine. My 3d artist ...
1
vote
1answer
435 views

GL_EXT_shadow_samplers killing my shader

I have the following fragment shader for my scene #extension GL_EXT_shadow_samplers : require ... vec4 color = texture2D(uTextureUnit0, varTexCoord0); if (colorTransformEnabled != 0) { vec3 ...
0
votes
3answers
1k views

Where to run logic update in openGL ES?

Using Canvas with Surfaceview I had a run() method where I would essentially do the following: onDraw(); update(); Where onDraw method would do the rendering and update would update all my game ...
-2
votes
1answer
220 views

Game code structure using openGL / Android [closed]

My game will have 3 activities (splashscreen, options menu and main game). As it stands, each is a separate activity with it's own activity class and GLSurfaceview class. Is this structure the right ...
2
votes
1answer
908 views

Separate renderng thread in Android (OpenGL ES 2.0)

I'm used to mainly working with the Canvas SurfaceView API on Android and have recently been learning openGL ES 2.0 With canvas I know that surfaceView gives you the ability to start a new thread to ...
1
vote
1answer
345 views

Powers of 2 textures in Android 2d games?

I've read a lot about the importance of using powers of 2 png's for textures when using OpenGL ES. However, how does this relate to Google's own documentation regarding the resizing of graphics for ...
0
votes
1answer
490 views

Drawing more that one quad with only one glDrawArray call…?

Edit After initially thinking that my sprite batch test was faster than calling each sprite individually, it appears that is not the case!! :-( With a single set of GL calls for a each sprite, I can ...
3
votes
2answers
3k views

Android: Loading bitmaps without premultiplied alpha (OpenGL ES 2.0)

Is this possible? To load textures in non-premultiplied format (Straight alpha?)? My game has 1 or 2 images which have semi-transparent pixels and I need to be able to fade them in and out but this ...
3
votes
1answer
1k views

How can I tell if OpenGL has finished rendering the current frame?

If I make a call to http://developer.android.com/reference/android/opengl/GLSurfaceView.html#requestRender() from my game loop, how can I tell when OpenGL has finished rendering? I don't want to ...
2
votes
0answers
244 views

iPhone GLSL shader dynamic branching issue

I am trying to pass an array of vec3 as uniform and then iterate through them on each pixel. The size of array varies on situations so I can't make the loop with constant number of iterations. ...
3
votes
1answer
1k views

Proper way to maintain Vertex Buffer Objects

I've started learning WebGL, currently I'm building a 2D lighting system, but there is some confusion going on inside my head. How the lighting works is based on this tutorial ...
0
votes
1answer
534 views

Get back or delete an existing OpenGL object, then change it and draw at new. How?

With OpenGL i'm drawing for example a circle. Can i take this drawn circle back out of the window and change something and then draw it back on the window? Or can i /have to delete it and then draw ...
7
votes
2answers
643 views

What's the best way to draw lots of trees

I'm writing an app which renders a random island planted with trees. The trees are currently two quads, criss-crossed and drawn with textures. I plan to have more complex meshes that form different ...
1
vote
2answers
308 views

Why doesn't a line draw after instantiating it on a thread other than the renderer thread?

I'm making a 2D game with OpenGL ES 2.0 on Android, as an excuse to learn a bunch of things. I'm drawing many lines to make a grid, but setting everything up takes time and I'd like to render a ...
-1
votes
1answer
128 views

GLES2 rendering performance for different iPad generations

I'm using C++/GLES2 for iPad only (no iPhone). The only device I own is an iPad2 and I do not plan to support iPad 1. Can anyone help me understand realistic goals/limits on iPad 2/3/4 in terms of ...
3
votes
1answer
327 views

Cut a translucent square in a texture

How to remove (cut-out) a transparent rectangle in a Texture, so that the hole will be translucent. On Android I would use the Xfermodes approach: ...
1
vote
2answers
267 views

How to get a texture from current point of view in OpenGL 2.0 ES?

Probably the title is confusing, but I didn't know how to ask better, sorry about that. What I would like to do is get a bitmap texture that represents exactly what's rendered at one point in time and ...
4
votes
2answers
379 views

Shadow artifacts caused by filtering

I'm working on a shadow-mapping implementation for an OpenGLES 2.0 environment (Stage3D in Flash to be exact). This is how my current implementation works: Render the scene to backbuffer. Render ...
2
votes
1answer
1k views

Trying to run sample AndEngine gles2 code in the simulator throws “java.lang.IllegalArgumentException: No EGLConfig found!”, how can I fix this?

I tried to run a small sample game code in the emulator but it crashed. My LogCat is given here. Can you help me resolve the issue. 02-23 15:18:50.543: D/AndEngine(636): MainActivity.onCreate ...
0
votes
1answer
880 views

Which version of AndEngine (gles1 or gles2) should I learn? [closed]

I m new to Game Development. I've chosen AndEngine, but there are 2 versions: gles1 and gles2. I tried sample code from both and found that gles2 code is not run on an emulator, but required an actual ...
0
votes
3answers
1k views

Why doesn't glBindVertexArray work in this case?

From my understanding of what glBindVertexArray does and how it works, the following code should work fine: First init: glGenVertexArraysOES(1, &_vertexArray); ...
2
votes
0answers
246 views

Camera - View matrix in Android + openGLES 2

I am trying to use the touch screen on the tablet to control my camera movements and generate the view matrix accordingly. I get the x and y coordinates of the screen and after doing some sanity ...
1
vote
0answers
372 views

Converting motionevent.getx and motionevent.gety to pixel or Object coordinates in the view

I am trying to draw buttons using OpenGL I have added a Gesture Listener for the GLSurface View now i have motionevent when ever the user touches. My question is how can i convert motionevent.getx and ...
2
votes
0answers
408 views

Can I use a shader with 2 different textures in Cocos2D (x)?

We are evaluating a variety of different graphic engines for use in our game and we want to be able to use 2 different textures for many of our sprite maps. One sprite map would be the standard RGBA ...
3
votes
1answer
360 views

Fill texture with white color

How to paint texture with white color? Example what I mean: SpriteBatch.setColor changes tint only.
0
votes
1answer
880 views

All of my matrix functions not working? OpenGL ES 2.0

I am trying to make a projection matrix scaling the screen and making a coordination system. For some reason I don't think any of my matrix calling is working... the 3 function I am using are ...
0
votes
1answer
200 views

OpenGL RTT FrameBuffer question and Rendering to texture while sampling it

What i need to do: Blur the selected texture and pass the texture to another effect for postprocessing. Notice that i want one texture passed all over. How do i want to do this: Bind the FBO ( ...
3
votes
2answers
2k views

OpenGL GL_TRIANGLE_STRIP creating grid with degenerate triangles / for one draw call

I need to create a grid ready for GL_TRIANGLE_STRIP rendering with One drawcall - so i need to degenerate the triangles. I am almost there but missing last row/column and can't figure out why. My ...
1
vote
1answer
221 views

Horizontal scroll only part of the view

I would like to know the best way on how to implement horizontal scrolling to only part of the view and vertical scrolling to complete view. I was able to achieve horizontal and vertical scrolling to ...
2
votes
1answer
813 views

How do I dispose of OpenGL resources cleanly on Android?

I am creating a framework for OpenGL ES 2.0 for Android. How can I cleanly dispose of my OpenGL resources when my Android app is done? I check for isFinished() in the onPause() event and then dispose ...
-1
votes
2answers
710 views

OpenGL 2.0 Android Scrolling Horizontally and Vertically

I am new to OpenGL2.0 in Android. How can I scroll the GLSurfaceView both horizontally and vertically?
1
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0answers
1k views

Draw Sphere - order of vertices [closed]

I would like draw sphere in pure OpenGL ES 2.0 without any engines. I write next code: int GenerateSphere (int Slices, float radius, GLfloat **vertices, GLfloat **colors) { srand(time(NULL)); int ...
3
votes
3answers
2k views

How can I make a shader effect that looks like a lightly shaded pencil drawing?

I want to make a shader effect using OpenGL ES 2.0 that looks like this image: I'm not sure if this image was painted or is the result of some filter, but I want to create a shader that produces ...
3
votes
4answers
641 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 ...
2
votes
2answers
882 views

How can I use an unsigned int as a GLSL attribute for OpenGL ES 2

I'm having trouble finding conclusive information on this, but it seems like I can't pass integer attributes to GLSL for OpenGL ES or that if I do they'll be converted to float. I need a value between ...
1
vote
1answer
383 views

How to have qt5 work on desktop like on mobile devices (es2, correct glsl version)?

I am looking for help/information concerning this issue : My work: I have an opengl es2 render engine that works on an iOS app. I almost managed to make it work by calling the same openGL rendering ...