Subset of the OpenGL 3D graphics API designed for embedded devices such as mobile phones.
0
votes
1answer
49 views
OpenGL Regarding Frame/Buffer Caching
I have been trying to get myself refreshed on OpenGL ES. Whilst doing so, I had the following question in mind:
Does OpenGL have any "caching" mechanism?
For example:
Let's say we draw a stationary ...
0
votes
1answer
35 views
OpenGL ES 2.0 Without The Use of Shaders
While refreshing my mind on OpenGL ES, I decided to read a few of the books I brought a while back and search for some tutorials online.
Whilst doing so, I came across many beginner's tutorials that ...
0
votes
1answer
41 views
GUI rendered into texture(s) or not?
I am eyeing OpenVG and cairo as rendering libraries for my pet game GUI. You can use both to render either into a texture or issue GL commands to draw directly onto the display. If I would use them ...
1
vote
1answer
19 views
Fragment shader operations before vector transformations
I feel like I'm misunderstanding how to work with vector/fragment shaders. My vector shader is as follows:
uniform mat4 uVMatrix; // view (camera transformations)
uniform mat4 uMMatrix; // ...
1
vote
0answers
44 views
Texture rebind on android cause potential memory leak?
After context lost, I have to rebind all my textures. I want to it the correct way, so I check each handle for availability. It's done by calling unloadFromVram(), and then loadToVram()
first unload:
...
0
votes
1answer
43 views
Libgdx OpenGL ES pixel shader behaves differently on android and on desktop
I'm currently working on a mobile game that ressembles a snake game ; what I wished to do was use my limited glsl knowledge to write a pixel shader that could efficiently draw a curve with a certain ...
1
vote
0answers
86 views
Making use of the Android GPU debugging tools
I tried following the manual to install the Android GPU debugging tools for android Studio 2.0. Unfortunately it has not been very successful.
I have been following the instructions of the official ...
4
votes
1answer
57 views
OpenGL ES Frame Skipping causing visible artifacts
I'm using OpenGL ES 3.0 on Android 5.1, and am noticing the following issues. I tried to implement the game loop which does exactly 60 updates and do as many frames as it can. Everything is smooth, ...
1
vote
1answer
46 views
How to map control key to a specific angle or orientation?
At the moment, I basically have built out a large hash table of various angles and what direction they map to, if the user would press right, up, down, left. This is needed, in my case, as I have a ...
0
votes
0answers
77 views
glMapBufferRange performance on devices with shared memory
I have a few questions regards to the glMapBufferRange performance on devices with shared memory between CPU and GPU (OpenGL ES 3 capable Android devices to be specific).
1 - Is the mapped buffer ...
0
votes
0answers
45 views
How to scale the camera
I'm developing a game engine (for the sake of knowledge) using OpenGL ES 1.x (Android). And there is a problem with scaling. To ensure that all textures are displayed correctly on various devices I ...
1
vote
0answers
20 views
OpenGL ES 2.0 not drawing images with shadows
I'm using OpenGL ES 2 to program a simple game 2D for Android mobile phones. I'm coding the rendering portion of the software, using the GLES20 default library.
All my sprites are rendered from a ...
0
votes
0answers
42 views
OpenGL ES vertex/fragment shaders - Blinn phong
I'm developing a simple educational project to study OpenGL ES.
I'm try to render some simple OBJ models using Blinn-Phong.
The first version of the of my implementation calculate all the lighting ...
1
vote
2answers
56 views
Should I use one GLSurfaceView.Renderer for each part of my game?
I am creating a small platformer-like game for Android using OpenGL. The game has 3 main screens/states:
Main menu screen
Level selection screen
The game screen
Currently I use a GLSurfaceView....
0
votes
2answers
73 views
2D Collision in tilemap - ArrayOutOfBounds
im trying to do collision detection with world based on tilemaps (two dimensional array)
array -
private int WIDTH = 10;
private int HEIGHT = 6;
String[][] simplemap = new String[][]{
{ "0","1"...
1
vote
0answers
142 views
How to draw 2D pixel data with OpenGL
I am fairly new to OpenGL. I have a 2D game in SDL2 that uses currently works by creating a SDL_Surface from the pixel data, copying it into a SDL_Texture, and rendering it to the screen with ...
2
votes
1answer
67 views
Is there any way in open-gl to “bit crush” everything on the screen?
I am making an educational game and am looking for options for a visual effect to show when something is "incorrect". So, I am looking to see if there's an easy way in openGL to temporarily distort ...
1
vote
0answers
48 views
Logical operations per component in GLSL
According to the OpenGL spec in GLSL, the logical operators: &&, || etc work between booleans, not vectors of booleans.
So, what is the best way to perform the logical and/or per component in ...
1
vote
2answers
69 views
How to optimize this branching instruction?
I have an outline shader, which samples my texture 8 times to compute the outline.
The problem is, that there's transitional alpha values between picture and background. To cut them off I'm using the ...
0
votes
0answers
127 views
YUV target on GL_TEXTURE_EXTERNAL_OES
I am using a surface texture bound to GL_TEXTURE_EXTERNAL_OES. I read that the GL_TEXTURE_EXTERNAL_OES texture target is usually in a YUV color space. I want to take "y" value for each pixel in ...
0
votes
1answer
59 views
Luminance 'y' value of surface texture
For my opengl video player app, I am using surface texture bound to GL_TEXTURE_EXTERNAL_OES
source : https://github.com/crossle/MediaPlayerSurface/blob/master/src/me/crossle/demo/surfacetexture/...
0
votes
0answers
48 views
OpenGL ES 2.0 how to access LUT
I've created a look up table for my fragment shader and I'm passing it in as a uniform float array.
uniform float hueLut[360];
My program works fine on most devices but I ran across one device where ...
-3
votes
1answer
25 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 ...
1
vote
1answer
50 views
Android Opengl: Alternate values for gl_FragColor
I'm writing an Android application that utilizes opengl to perform some changes to the camera output. I've written my code in such a way that I finally figured out what is causing the performance ...
0
votes
1answer
260 views
Is Angry Birds Made Purely Using Bitmaps/Raster graphics? [closed]
Being a beginner game developer I would like to start creating my own engine and graphics so I am concerned about how successful games accomplish the graphics portion.
My question is, are all the ...
3
votes
1answer
81 views
Libgdx - GLSL shader which uses mod doesn't seem to work properly on android
Through trial and error I've managed to come up with a scanline-ish shader I'm satisfied with. On my desktop testbed it looks like this:
Basically, every 2nd(vertical) pixel is darkened.
However, ...
1
vote
1answer
78 views
cannot implement GLSurfaceView.RENDERMODE_WHEN_DIRTY
I'm trying simply to display an openGL surface when I click the screen using GLSurfaceView.RENDERMODE_WHEN_DIRTY mode
but the surface does not display when I click it , why ?
my Activity :
public ...
2
votes
0answers
145 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 ...
1
vote
0answers
49 views
Stencil buffer confuse
I was trying to make two object outline. One would color the object with orange and other with green. I just wanna know if is it possible to have two object outline at the same time because every time ...
2
votes
1answer
106 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 ...
2
votes
0answers
64 views
Render triangles without index buffer in Opengl ES [closed]
I'm reversing a 3d model format from a famous game (not sure if i should mention it), which is released both for windows (app store) and for Iphone and android.
The weird thing is that while the ...
4
votes
1answer
300 views
Is this the typical approach to modern OpenGL UI & Text rendering, for mobile?
I'm implementing GUI in OpenGL ES 2.0 to fit with my application framework's existing structure. I'd like to have the UI rendering eat as little mobile processing capacity as possible. So to confirm......
2
votes
2answers
67 views
IOS/Android Game programming [closed]
I am somewhat new to the whole game programming thing. I was wondering if I could develop a game for IOS and Android with using openGLES. if so how can I run the code on the devices and what are some ...
5
votes
0answers
101 views
OpenGL: Frame partially jumps back and forth
I'm working on a project with SDL and OpenGL. The game works great on Windows, Linux, OS X and iOS. However, the Android version is showing a problem on my phone in particular. I have tested another ...
1
vote
0answers
31 views
How to use quaternion on another referential
I'm new on Three.js and despite a mechanical background, I can't find how quaternion works: it's like it always refers on local part referential and not the global one.
I've illustrated it here : ...
3
votes
3answers
198 views
How to hide a post-processed mesh outline when/where the mesh is hidden
I'm working on setting up an active outline in my 3d engine, a highlight effect for selected 3d characters or scenery in the screen. After working with the stencil buffer and getting some ...
1
vote
0answers
168 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 ...
1
vote
2answers
566 views
How to compile with OpenGL ES on Windows?
I downloaded OpenGL ES 3.1 sdk here.
But when I tried to run (or compile and run) the executable in "samples" directory, I got the following message:
The program can't start because libGLESv2.dll ...
2
votes
0answers
89 views
Using depth values for fake ambient occlusion
I'm using the normalized distance to the camera to get depth information in the fragment shader. When using this value as fragment color, it looks at lot like ambient occlusion (of course only in the ...
2
votes
1answer
76 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 ...
2
votes
1answer
113 views
Working around the current sad state of mobile GPU drivers
I'm working on a OpenGL ES3 app for Android: for various reasons, I decided to roll my own mini-OpenGL rendering engine. So far so good.
Problem is, the GPU drivers in the mobile industry are such ...
0
votes
2answers
607 views
Is it possible to convert vec4 to int in GLSL (using OpenGL ES)
I need GPU to do some computations, and I pass shader an int array using glTexImage2D (internal format is GL_RGBA). I use texture() to get the data, but it returns a vec4 value. Is it possible to ...
1
vote
1answer
170 views
OpenGL: How to map point inside frustrum to normal device coordinates (NDC)?
I read this article http://www.songho.ca/opengl/gl_projectionmatrix.html.
It's explain how calculate projection matrix coefficients.
But I completely can't understand how author perform mapping from ...
0
votes
0answers
72 views
Camera rotation destroy scene objects orientation
I fight with that for some time and searching internet but I don't have any answer for my problem. In few words i want to have orbiting camera on screen and objects which I want also rotate ...
0
votes
1answer
161 views
Basic vertex shader, moving
I am new in shader concepts and I am trying to implement a sprite of 8x8 in OpenGL ES.
I want to move the texture in the vertex shader but I cant figure out how to this, my code may be wrong, feel ...
3
votes
2answers
321 views
How to set borders in Rubik's cube using opengl GLSurfaceView
I'm developing a Rubik's cube game like seen in the picture. But I'm facing problems to set the cube face color with black border.
public void setupSides() {
int i, j, k;
// Paint back blue
i = 0;
...
1
vote
1answer
690 views
Transparency in GLSurfaceView
I'm new in game development. I have a view using GLSurfaceview and call in MainActivity.
i want to make transparent that view. i have tried setZOrderOnTop() method in MainActivity and glClearColor() ...
1
vote
1answer
788 views
Bad performance using VBO with OpenGL ES in Android
I'm making an Android app and I need to draw some polygons using OpenGL ES. I'm able to render them but I'm disappointed with performance. I updated the code to use VBO but I didn't notice any ...
0
votes
1answer
591 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 ...
3
votes
1answer
1k views
How do I draw a circular portion of a texture within LibGDX using an OpenGL ES shader?
What is the simplest way to implement a shader to draw a circular portion of a full screen texture where the circle is dynamically resized as part of an animation using LibGDX?
Is a shader even the ...
