OpenGL ES 2.0 emphasizes a programmable 3D graphics pipeline (comparing to fixed-function pipeline of OpenGL ES 1.1).
0
votes
0answers
10 views
Emscripten / webgl lazy rendering?
I compiled existing opengl es 2.0 code to webgl using emscripten. In the desktop version there is lazy rendering mechanism that only renders when required which is basically just saying invalidate ...
1
vote
0answers
87 views
Bilinear filtering by sampling corners of a texel
I'm trying to do bilinear filtering in texels to get the convoluted value of a 3x3 block. Implemented as below:
offsetx = 1/width
offsety = 1/height
Fragment shader:
"varying vec2 ...
1
vote
1answer
25 views
How to know when Android OpenGL Context has been preserved?
I am implementing a pause menu for my game in Android.
If the activity pauses and then resume, It lose the OpenGl context.
However if you use setPreserveEGLContextOnPause(true) it MAY preserve the ...
0
votes
1answer
23 views
Opengles 2.0, Replace the black region in the image to make it transparent
I have two textures, Source image A and Overlay B, B is drawed on top of A, I want to replace the black color in B, then make the region of A visible, what should I do?
This is my shader language:
...
3
votes
0answers
49 views
Optimal batching for 2D objects with transparency
I have a collection of 2d objects with transparency. Each object has a depth value to determine draw order and a material. I'm trying to batch them in an optimal way to minimize draw calls. Assume ...
0
votes
1answer
66 views
How can I describe a square in OpenGL ES 2.0?
I need to draw a Tic-Tac-Toe board in Xcode using OpenGL ES 2.0. I am new to graphics programming and can't find good information on drawing a square in opengl es in iOS. I looked at Ray's tutorials, ...
-3
votes
1answer
24 views
OpenGL ES 2 inheriting issues [closed]
I am Having an issue where one of my classes will not inherit the other ones variable value. In the class which is inherited. It shows the value of the float just fine. But when I go to the Class ...
0
votes
0answers
28 views
Simple OpenGL ES 2 program fails
I'm stuck on a very simple OpenGL ES application from 2 days now. I am a "beginner" OpenGL developer, and this is my first attempt at the ES version on android. This is a VERY simple app, the usual ...
1
vote
0answers
48 views
how to temporarily turn off/on multisampling for an OpenGL ES 2.0 render context in Android?
In my OpenGL ES 2.0 Android app, I render to an EGL surface with >= 2 samples; I obtain this surface by passing:
EGL14.EGL_SAMPLES, 2
as part of the attribute_list argument for egl.eglChooseconfig() ...
1
vote
1answer
56 views
Effect of vertex winding on normals and shading
I have implemented a Phong and Gourand shader for a triangle mesh that is being imported from an STL file. It appears to be working fairly allright but some triangles seem to be what I can only ...
1
vote
1answer
44 views
OpenGL ES 2.0 facet lighting
I am trying to figure out if there is a way to achieve facet lighting in OpenGL ES 2.0 without extensions. I know it is possible if I don't used indexed vertices but I don't really want to do that ...
5
votes
1answer
355 views
Calculated normals for mesh not working
I am trying to implement a 3D mesh viewer with C++ and OpenGL ES 2. I am currently struggling with the calculation of the normals for the vertices, or at least I think that is where the problem ...
1
vote
0answers
40 views
blending with OpenGL glBlendFunc and glBlendEquation
I want to draw a bunch of images in front of a background. Where images overlap, I want those to be blended together (for now, using a mix of 0.5 source * 0.5 destination color every time an image ...
1
vote
1answer
37 views
Rendering sprites on a Mali-400 MP device
I started developing a small cross platform game engine using OpenGL, I am working actually on a sprite batch renderer.
Everything is working fine on OS X, iOS, Win32, and some Android Devices. Here ...
0
votes
1answer
61 views
drawing a horizon / sky in OpenGL ES 2.0
I want to render a sky: My camera is at the origin, and I want there to be a white background for all world coordinates with z < 0 (would normally be considered y > 0, but I have a different ...
0
votes
1answer
44 views
Opengles 2.0 multi Textures fade out one by one
I have multi textures, A was drawed on top of B, B was on top of C ...., ( like Picture 1) .I want to fade out A first, then B will appear and fade out either... But when A fade out, background color ...
1
vote
0answers
32 views
OpenGL ES 2.0: Highly variable time spent in GLES20.glDrawArrays(). How to find the cause?
How can I debug why the time take to issue exactly the same GL commands to render a frame, especially the call to GLES20.glDrawArrays(), is highly variable even when there is no garbage collection and ...
3
votes
0answers
38 views
When I add in Java transformationMatrix I can't see images? [closed]
When I add in Java transformationMatrix I can't see images moving but when I remove it I can see why and how to fix it? Any ideas how to fix it?
My Renderer class:
public class Renderer {
...
2
votes
0answers
80 views
Texture coordinates for custom geometry in SceneKit ios9
I am trying to texture the a custom plane shape I created in scenekit on iOS9. I need the texture to spread out and stretch over the entire surface. I have a vertex and fragment shader on an ...
2
votes
1answer
58 views
Get Stencil buffer working iOS OpenGL ES 2.0
I have been trying to get this work but either get black screen or reporting error when using XCode to analyze the GL code like below. Any help appreciated. I am using Swift here if that making a ...
4
votes
1answer
67 views
Shaders: packing 4 textures into a single RGBA - slower?
I'm experiencing something really strange on an iOS mobile device. I have 4 textures, and after some profiling it seems, that doing four separate grayscale texture reads is faster, than reading the ...
2
votes
1answer
133 views
Stencil Buffer not working as expected in OpenGL ES 2.0 (Android)
I'm trying to get to grips with the stencil buffer.
Apart from setting up viewport, camera, etc, my OpenGL ES 2.0 initialisation code is:
GLES20.glDisable(GLES20.GL_CULL_FACE);
...
5
votes
1answer
249 views
What's the best practice for a progress bar in OpenGL ES 2.0 (Android)
As the title says, what is the best practice for a progress bar in OpenGL ES 2.0 on Android ?
My attempt: I make a texture (could be a single colour or otherwise), and then stretch that texture from ...
1
vote
2answers
268 views
Optimize drawing “different” sprites in OpenGL ES 2.0 (batching?)
I started experimenting with OpenGL ES 2.0, and I'm trying to figure out a way to optimize/batch sprite drawing, where sprites only have the texture in common, but differ in the following properties:
...
1
vote
0answers
114 views
How do I draw multiple irregular polygons with OpenGL ES?
In this post I was asking how to program a map of a Risk-like game.
Now that the map is pretty coded, both client and server-side, I'd like to finally draw the map.
I'll try to keep least broad as ...
0
votes
0answers
22 views
OpenGL ES 2.0 save data for next render cycle
I'm currently writing a simple game, that should be able to cope with moving and rendering a large number of ships (particles). I started benchmarking with a sprite system, but obviously it was to ...
3
votes
1answer
82 views
Do shader compilers typically know not to look up unused texture channels?
I have a texture that's from the color attachment of an FBO in OpenGL ES 2.0, so I have limited control over the number of channels in the image.
Suppose I only need the color from the R channel of ...
0
votes
0answers
31 views
OpenGL ES 2.0 + Cairo HUD
I have posted this on StackOverflow before finding this Q&A so please excuse the double post but I think there will be more experts in terms of OpenGL around here.
I am trying to render a HUD ...
0
votes
1answer
254 views
Setting up a Visual Studio project for OpenGL and OpenGL ES
I want to make a small game with OpenGL and glew for desktop, android and web.
So far I know how to set up a project for opengl and a project for opengl es but I would like to have the game source ...
3
votes
1answer
148 views
How to deal with overlapping black parts of Light mask textures?
I am using this masking texture for a dynamic lighting effect in my game:
It looks beautiful until two lights begin to overlap:
This is obviously because the textures are overlapping when I draw ...
0
votes
0answers
13 views
AndEngine : Collision does not make line disappear
I have drawn the line between two sprites and there is a rectangle.
When the line collides with rectangle the line should be invisible else the line should be visible.
But i am having problem with ...
0
votes
0answers
64 views
Opengl Create FBO- fatal signal 11 error
in my android game, i want to render My scene in the FBO and a texture attached to it, and use that texture later, But When i use glGenFramebuffers i get this error:
07-30 06:17:27.839: A/libc(1338): ...
2
votes
1answer
60 views
OpenGL ES God Ray Precision error
I have encountered the following (i think) precision error.
(missing link need 10 rep)
My source of inspiration was:
(missing link need 10 rep)
On the PC everything works fine, but on android it ...
0
votes
1answer
160 views
How to send dynamic data to a vertex shader OpenGL ES 2 Android
I'm very new to Android development and OpenGL ES 2.0.
I have been working through a book called "OpenGL ES 2 for Android A Quick Start Guide" which has been useful, but at times I get a bit lost as ...
0
votes
1answer
55 views
Best approach for level specific textures
TL;DR: Best way to handle level-specific textures without overkilling memory usage and killing performance and keeping things clean in OpenGL for mobile (also lower-end devices) and desktop using ...
0
votes
0answers
171 views
OpenGL - Make two images blend together
I have 2 images that are .png and they mix together, The problem is that one overwrite the other. I know that the draw order matters, but In that case I should redraw the icons 2 times ( there is a ...
0
votes
0answers
37 views
Issue with texture mapping on a spehre using opgengl es 2.0
I have a problem to calculate the right UV coordinates.
I'm calculating the sphere by subdivate a ocathdron.
What did I do wrong?
Calculate UV Points for the texture:
private ...
1
vote
1answer
72 views
How to debug a GLSL shader? [duplicate]
I cannot find any tutorial in Google and Youtube. I have a C++ program that uses OpenGL ES 2.0 API to render something on the screen. How can I debug my shaders? Any step-by-step guide? What is the ...
2
votes
1answer
218 views
Looking for specific “textured quad” openGL tutorial in c++ [closed]
I'm new to openGL and I've been googling around for the old and simple textured quad tutorial in openGL but I haven't been able to find one that suits my needs.
OpenGL3.X compatible
OpenGL|ES 2.0 ...
0
votes
1answer
215 views
Moving texture OpenGL ES 2.0
I am trying to implement a sprite of 8 columns and 8 rows in OpenGL ES 2.0
I made appear the first imagen but I cant figure out how to translate the Texture matrix in OpenGL ES 2.0 , the equivalent of ...
0
votes
1answer
55 views
Android Density Independent Pixel Drawables Resource Folder
I'm trying to get to grips with DIP in Android (using Eclipse). I'm writing a little game with OpenGL ES 2.0. Could I get some guidance and tips on what I'm not understanding/doing right.
From what I ...
0
votes
1answer
51 views
OpenGL ES 2.0 basic camera issues
I am having issues with the camera, I cant find how to invert the AXIS
Now
A point is 0,0,0
B point is 1,0,0
C point is 0,0,1
What I want is
A point 0,0,0
B point 0,0,1
C point 1,0,0
...
1
vote
1answer
259 views
Techniques for drawing lines, with mouse, on 3D objects in WebGL or OpenGL?
Can anyone point me to techniques for drawing lines, with the mouse, on 3D objects in WebGL or OpenGL?
Here's the effect I'm looking for, using WebGL: http://www.spacegoo.com/cadillac/
I can imagine ...
0
votes
1answer
280 views
OpenGL ES 2.0 2D-Image displaying
I have followed the official OpenGL ES tutorial to create a working OpenGL-environment. I have been able to do anything I wanted to except for displaying 2D-images. To do so I worked through this ...
0
votes
1answer
364 views
OpenGL ES 1.0 to OpenGL ES 2.0, I cant draw a square
I am learning open GL ES 2.0 and I just made 1 easy game for 1.0
I am following tutorials but I cant understand this thing
In OpenGL ES 1.0 if I define a square that way:
private float[] vertices = ...
3
votes
0answers
98 views
Does anyone know what technique was used in Minecraft to create shadows? [closed]
Specifically I want to know the technique used to render shadows under animals and players.
I would like to create shadows like that for my own block game but I don't even know what to google. Any ...
0
votes
1answer
170 views
Should I update VAO when I update a VBO?
My VAO/VBO/IBO work fine on iPad and other devices on Android excepted two (A Samsung galaxy S4 and a Sony Xperia S).
A problem is present when I start my application on this devices, every elements ...
0
votes
1answer
102 views
How can I render a simple lattice in LibGDX?
I have searched all over, but I can't find what I think will be a simple answer. I am using Opengl ES 2.0, and LibGDX. I simply want to use GL_LINES primitives to create a lattice structure.
I have ...
3
votes
1answer
125 views
Texture loading: Everything at once OR un-/loading the needed assets? [duplicate]
Good evening. We've been developing quite a huge game for android on the basis of AndEngine. So we have a lot of assets to load, especially textures.
At the moment everything (sound, textures etc) ...
3
votes
1answer
146 views
How do OpenGL ES 2 engines typically handle automatic geometry sorting and batching?
I'm trying to write a basic OpenGL ES 2 engine that can automatically sort and batch a fairly flexible set of input draw descriptions.
When I say 'draw description' I mean the actual uniforms, ...
