OpenGL ES 2.0 emphasizes a programmable 3D graphics pipeline (comparing to fixed-function pipeline of OpenGL ES 1.1).
12
votes
2answers
332 views
OpenGL: Where shoud I place shaders?
I'm trying to learn OpenGL ES 2.0 and I'm wondering what is the most common practice to "manage" shaders.
I'm asking this question because in the examples I've found (like the one included in the API ...
12
votes
3answers
4k views
Is deferred rendering/shading possible with OpenGL ES 2.0 ?
I asked this on StackOverflow, but it might make more sense here:
Has anyone implemented deferred rendering/shading under OpenGL ES 2.0? It doesn't support MRTs, so with only one color buffer, it's ...
8
votes
3answers
2k views
How can I bend an object in OpenGL?
Is there a way one could bend an object, like a cylinder or a plane using OpenGL?
I'm an OpenGL beginner (I'm using OpenGL ES 2.0, if that matters, although I suspect, math matters most in this case, ...
7
votes
2answers
307 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 ...
6
votes
1answer
615 views
How can I organize render and transformation data in a scalable fashion?
I am writing for OpenGL 2.0 and in the future porting to OpenGL ES 2.0. I only use VBOs and shaders (no immediate mode, no vertex arrays).
I already have working solutions, they just... feel wrong. ...
6
votes
4answers
446 views
Impact of variable-length loops on GPU shaders
Its popular to render procedural content inside the GPU e.g. in the demoscene (drawing a single quad to fill the screen and letting the GPU compute the pixels).
Ray marching is popular:
This means ...
5
votes
4answers
876 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 ...
5
votes
4answers
389 views
How to visually “connect” skybox edges with terrain model
I'm working on a simple airplane game where I use skybox cube rendered using disabled depth test.
Very close to the bottom side of the skybox is my terrain model.
What bothers me is that the terrain ...
5
votes
1answer
353 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 ...
5
votes
2answers
520 views
Draws fine in full OpenGL; not drawing anything in Chrome NaCL
I'm appealing to people's psychic debugging skills:
I have an OpenGL app that uses shaders and attributes in uploaded VBOs exclusively.
It runs fine on the desktop (Linux with integrated Intel ...
5
votes
2answers
742 views
Getting the number of fragments which passed the depth test
In "modern" environments, the "NV Occlusion Query" extension provides a method to get the number of fragments which passed the depth test. However, on the iPad / iPhone using OpenGL ES, the extension ...
5
votes
1answer
342 views
FBO rendering different result between Galaxy S2 and S3
I'm working on a pong game and have recently set up FBO rendering so that I can apply some post-processing shaders. This proceeds as so:
Bind texture A to framebuffer
Draw balls
Bind texture B to ...
4
votes
1answer
499 views
Multiplication for MVP matrices: Any benefits to doing so within the vertex shader?
I'd like to understand under what circumstances (if any) it is worth doing MVP matrix multiplication inside a vertex shader.
The vertex shader is run once per vertex, and a single mesh typically ...
4
votes
2answers
240 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 ...
4
votes
1answer
1k 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 ...
4
votes
1answer
418 views
OpenGL ES 2.0 texture distortion on large geometry
OpenGL ES 2.0 has serious precision issues with texture sampling -
I've seen topics with a similar problem,
but I haven't seen a real solution to this "distorted OpenGL ES 2.0 texture" problem yet.
...
4
votes
2answers
298 views
What is Khronos EGL?
I see that modern OpenGL related code uses EGL, i can't get good resources for this so i ask here:
what exactly is EGL ?
if a platform supports OpenGL ES 2.0+ or OpenGL 3.0+ i can presume that will ...
4
votes
1answer
751 views
OpenGL ES 2 shaders for drawing buildings and roads like Google Maps does
I'm trying to create a shader that'll give me an effect similar to what buildings and roads look like on 3D Google Maps. You can see the effect interactively if you enable WebGL at maps.google.com, ...
4
votes
3answers
392 views
OpenGL ES 2.0 - How to batch draw particles that have unique translations, rotations, scales, and alphas?
I've combined all of my vertex data for many particles into a single array. How would I batch draw all of those particles in a manner that preserves their unique translations?
Any code examples ...
4
votes
1answer
154 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 ...
3
votes
3answers
865 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
306 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 ...
3
votes
2answers
945 views
What is causing these visual artifacts on my OpenGL sprites?
What could be the cause of the defects in my characters sprite? I am using OpenGL ES 2.0. I draw my sprites in a sprite batch that uses UV coordinates from one large texture atlas. If you look around ...
3
votes
1answer
1k views
How should I move 2D objects in OpenGL ES 2?
I am a bit confused about what I need to move a basic square. Should I use a translation matrix or just change the object vertices? Which one is better?
I use a simple vertex shader, gl_Position = ...
3
votes
2answers
398 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 ...
3
votes
2answers
654 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 ...
3
votes
1answer
1k 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 ...
3
votes
4answers
2k views
Geometry instancing in OpenGL ES 2.0
I am planning to do geometry instancing in OpenGL ES 2.0
Basically I plan to render the same geometry(a chair) maybe 1000 times in my scene.
What is the best way to do this in OpenGL ES 2.0?
I am ...
3
votes
1answer
370 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 ...
3
votes
3answers
2k 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 ...
3
votes
1answer
113 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:
...
3
votes
1answer
146 views
Fill texture with white color
How to paint texture with white color? Example what I mean:
SpriteBatch.setColor changes tint only.
3
votes
1answer
386 views
Can glTexImage2D() use an already existing memory block?
Can I use glTexImage2D() and / or glTexSubImage2D() (or maybe there's some other method I don't know about) with an already existing block of memory, instead of always uploading the changed pixels? I ...
3
votes
1answer
202 views
Why did an Android update disable the textures in my game?
I recently updated my tablet to Android 4.0.3 and now the textures for my game do not show up. I'm using OpenGL-ES 2.0 for my engine. It worked fine when I was running android 3.0. Is there any ...
3
votes
2answers
71 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 ...
3
votes
2answers
350 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 ...
3
votes
1answer
194 views
cocos2d mask rotation
I've been experimenting with Ray Wenderlich's tutorial about masking sprite using shaders with cocos2D 2.0.
It works pretty well but now I'd like to rotate the mask independently of the masked ...
3
votes
1answer
4k views
OpenGL ES 2 on Android: native window
According to OGLES specification, we have the following definition:
EGLSurface eglCreateWindowSurface(EGLDisplay display,
EGLConfig config,
...
3
votes
1answer
482 views
Integration of LibRocket and Android
I am using OpenGL ES 2.0 to create a 2D game for Android 2.2 and was planning on using LibRocket for the GUI. Does anyone have any links or knowledge they would share on how to integrate LibRocket ...
3
votes
1answer
815 views
How can I create an orthographic display that handles different screen dimensions?
I'm trying to create an iPad/iPhone game using GLES2.0 that contains a 3D scene with a heads-up-display/GUI overlaid on the top. However, this problem would also apply if I were to port my game to a ...
2
votes
2answers
574 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
2answers
1k views
Are there any OpenGL ES 2.0 examples for JOGL?
I've scoured the internet for the last few hours looking for an example of how to run even the most basic OpenGL ES 2 example using JOGL but "by Jupiter!" it has been a total fail.
I tried ...
2
votes
2answers
637 views
Mesh with quads to triangle mesh
I want to use Blender for making models yet realize some of the polygons are not triangles but contain quads or more (example: cylinder top and bottom). I could export the the mesh as a basic mesh ...
2
votes
1answer
369 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 ...
2
votes
2answers
1k views
What is the proper use of CADisplayLink, and where do I put game logic?
I have an iOS OpenGL ES 2.0 game and currently have a CADisplayLink with a :render method. In this render method I do all the game's logic updates and drawing.
Is this correct? Or should my game ...
2
votes
1answer
661 views
gluLookAt on OpenGLES2
gluLookAt is not available in OpenGLES 2. OpenGLES 2 is also using floats not doubles.
Taking the description on the gluLookAt man-page, I have implemented it like this:
void ...
2
votes
2answers
150 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 ...
2
votes
1answer
199 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 = ...
2
votes
1answer
158 views
Efficient manager/controller for uniform and/or attribute variables in a rendering engine
Most engines on the market have their drawbacks and it's difficult to find a simple/light-weight one that's open-source and doesn't have to put you through a rather complex learning process. Writing ...
2
votes
1answer
684 views
Optional samplers in shaders
I have a scene. Sometimes I draw untextured, coloured, semi-transparent triangles, sometimes I texture them, and I draw a lot of both in a fairly interleaved manner.
In a fixed function pipeline the ...
