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
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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 ...
4
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3answers
597 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 ...
2
votes
3answers
4k 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 ...
6
votes
1answer
658 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 ...
15
votes
2answers
606 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 ...
2
votes
1answer
192 views

What causes the iOS OpenGLES driver to allocate extra memory?

I'm trying to optimize the memory usage of our iOS game and I'm puzzled about when/why the iOS GLES driver allocates extra memory at runtime... When I run our game through Instruments with the OpenGL ...
0
votes
1answer
426 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
836 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 ...
1
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2answers
266 views

Low complexity shader to indicate the sides of a polyline

I have a bunch of polylines that I draw using GL_LINES. They can have thousands of points. They actually represent the separation of land and water on a map. I don't have complete polygons, just the ...
1
vote
1answer
376 views

GLES2.0 3D Android game performance and multi threading the update?

I have profiled my mixed Java\C++ Android game and I got the following result: As you can see, the pink think is a C++ functions that updates the game. It does things like updating the logic but it ...
0
votes
1answer
381 views

OpenGL ES 2. How do I Create a Basic Fading Streak Effect?

For the iPad app I am writing using OpenGL ES 2 I have a single quad - shaded using GLSL - that is dragged around the screen. Very basic. This works fine. But is rather boring. I want to increase ...
0
votes
1answer
616 views

Why do my 512x512 bitmaps look jaggy on Android OpenGL?

This is sort of driving me nuts, I've googled and googled and tried everything I can think of, but my sprites still look super blurry and super jaggy. Example: Here: ...
3
votes
1answer
319 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 ...
2
votes
2answers
192 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
515 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 = ...
1
vote
1answer
483 views

Draw multiple objects with textures

I want to draw cubes using textures. void OperateWithMainMatrix(ESContext* esContext, GLfloat offsetX, GLfloat offsetY, GLfloat offsetZ) { UserData *userData = (UserData*) esContext->userData; ...
1
vote
2answers
277 views

Depth buffer values reset on change shader?

I have 2 different shaders, and when I change the shader (glUseProgram), it seems that the depth information is lost, because everything drawn with the 2nd shader appears completely on top of anything ...
3
votes
2answers
757 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
1answer
501 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
134 views

running GL ES 2.0 code under Linux ( no Android no iOS )

I need to code OpenGL ES 2.0 bits and i would like to do this and run the programs on my desktop for practical reasons. Now, i already have tried the official GLES SDK from ATI for my videocard but ...
2
votes
1answer
154 views

How to implement custom texture formats in Android?

What I know: Android can load PNG, BMP, WEBP,... via BitmapFactory. What I want to achive: Load my own 2D file format (e.g. 1-bit texture with a 1-bit alpha channel) and output a RGBA8888 texture. ...
5
votes
2answers
1k 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 ...
4
votes
2answers
957 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 ...
3
votes
1answer
225 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
528 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
4answers
754 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
4answers
2k 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 ...
2
votes
1answer
286 views

Is there any reason not to save skinning animation data in texture?

I have thought about saving animation data in texture. I think I can save shader parameter setting and interpolation cost in CPU, and also enable animated instancing. But I couldn't find no text ...
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3answers
532 views

OpenGL are strips/fans faster for rendering or just data bandwidth

When we send data for drawing we can mark it as TRIANGLE_STRIP or TRIANGLE_FAN to reduce the number of vertices we have to specify. Now, does this actually improve the rendering speed on the graphics ...
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
398 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 ...
0
votes
3answers
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Using multiple sprite sheets for same object AndEnginge

I have multiple sprite sheets for my object(Parrot) like eating, moving left to right, right to left and much more. I am using AndEngine gles2.0. How should I implement it? Every time I have to use ...
4
votes
3answers
4k 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 ...
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() { ...
2
votes
1answer
390 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 ...
1
vote
1answer
515 views

Maintain performance and precision with a large vertex buffer?

I have a world with 100s of simple objects on screen at once. Most objects don't have more than 40-50 vertices. The vertex coordinates for these objects are very large (planetary scale), so I use the ...
2
votes
1answer
2k views

Best practice to use Sprites in a game using AndEngine GLES2

Currently I am having static reference to all my sprites and loading and initializing them in my OnCreateResource mthod of SimpleBaseGameActivity, But now I have to override onAreaTouched listener on ...
-1
votes
1answer
129 views

Constructing a ladder

Let's start with a basic OpenGL ES 2.0 setup (like the Xcode OpenGL game template), If I want to add parts (vertices I should say?) to my model over time, what should I do! To clarify, let's say I ...
0
votes
3answers
6k 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). ...
4
votes
1answer
926 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
1answer
1k 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 ...
6
votes
4answers
1k 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 ...
4
votes
1answer
1k 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, ...
5
votes
4answers
4k 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 ...
0
votes
3answers
227 views

Understanding how to go from a scene to what's actually rendered to screen in OpenGL?

I want something that explains step by step how, after setting up a simple scene I can go from that 'world' space, to what's finally rendered on my screen (ie, actually implement something). I need ...
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0answers
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Move a 2D square on y-axis on Android GLES2

I am trying to create a simple game for Android. To start, I am trying to make the square move down the y-axis, but the way I am doing it, it doesn't move the square at all and I can't find any ...
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1answer
723 views

OpenGL ES 2 - glSwapBuffers?

this is what i do to blit FBO onto screen in ViewController: [m_Context presentRenderbuffer:GL_RENDERBUFFER]; but i need something like glSwapBuffers, so that i can call it somewhere from the ...
0
votes
1answer
381 views

Straightforward guidelines for converting OpenGL to OpenGL ES?

Is there a straightforward list of finite steps that I need to follow to convert an OpenGL program into an OpenGL ES that's used on the iPhone and iPad? I'd be using GLKit. I've seen some similar API ...
0
votes
2answers
977 views

Could someone explain why my world reconstructed from depth position is incorrect?

I am attempting to reconstruct the world position in the fragment shader from a depth texture. I pass in the 8 frustum points in world space and interpolate them across fragments and then interpolate ...