Subset of the OpenGL 3D graphics API designed for embedded devices such as mobile phones.
1
vote
0answers
36 views
OpenGL ES 2/3 vs OpenGL 3 (and 4) [on hold]
I have migrated my code from OpenGL ES 2/3 to OpenGL 3 (I added bunch of defines and abstract classes to encapsulate both versions, so I have both in one project and compile only one or another). All ...
1
vote
1answer
72 views
Pixmaps, ByteBuffers, and Textures…Oh my
My ultimate goal is to take a specific region of the screen, and redraw it somewhere else. For example, take a square from the upper left hand corner of the screen and redraw it on the lower right ...
0
votes
1answer
40 views
How to use mipmap in OpenGL-ES
I have recently entered in the OpenGL world. I am very pleased with the performance that I got with opengl compared to those obtained with a SurfaceView and its canvas. At the same time because of the ...
1
vote
1answer
114 views
OpenGL slower than Canvas
Up to 3 days ago I used a Canvas in a SurfaceView to do all the graphics operations but now I switched to OpenGL because my game went from 60FPS to 30/45 with the increase of the sprites in some ...
0
votes
1answer
46 views
How do I load BSP files in Android?
I understand that Opengl directly cannot load BSP files. How would I go about loading them into my Android game?
2
votes
1answer
69 views
OpenGL texture on sphere
I want to create a rolling, textured ball in OpenGL ES 1.0 for Android. With this function I can create a sphere:
public Ball(GL10 gl, float radius)
{
ByteBuffer bb = ...
0
votes
1answer
113 views
How to do frame by frame animation in android using open gl es
I have application in some part i am using AndroidDrawable for animation but it giving jerking effect that why i planed to change the code to Open Gl ES for better performance .so far i have googled ...
0
votes
0answers
56 views
Error when create FrameBuffer: GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS
I'm using libgdx, to create some program. I need used some operation in framebuffer. For this operation I create new framebuffer, after this operation I'm call in framebuffer dispose(). When I create ...
4
votes
1answer
70 views
GetData() error creating framebuffer
I'm currently porting a game written in C# with XNA library to Android with Monogame.
I have a Texture2D and i'm trying to get an array of uint in this way:
Texture2d textureDeform = ...
1
vote
1answer
79 views
rendering transparent meshes in LibGDX
Building open this tutorial - https://code.google.com/p/libgdx/wiki/ProjectionViewportCamera
I have constructed a class for generating polygon meshes. But i cannot figure out how to render semi ...
0
votes
2answers
98 views
glTexImage2D not loading my data
Can anyone suggest why this code doesn't work? When I draw using this texture all I get is black. If I use GLUtils.texImage2D() to load a png file, it works correctly.
ByteBuffer bb = ...
0
votes
1answer
99 views
how to make cross platform 3d games using modern opengl? [closed]
How to create games that run on windows, Linux, mac os x, android, ios, wp8 etc....
using c/c++, opengl 3 or 4 and opengl es 2.0.
any tutorials or videos on how to create cross-platform 3d games.
3
votes
1answer
157 views
Sprite sheet textures picking up edges of adjacent texture
I have a custom sprite routine (openGL 2.0) which uses a simple sprite sheet (my textures are arranged horizontally next to each other).
So, for example, here is a test sprite sheet with 2 simple ...
-2
votes
2answers
122 views
In OpenGL, how to confirm a primitive is rendered properly
I have to confirm that a primitive (say triangle) is rendered properly in opengl.
I can use the glGetError() after a opengl draw calls(glDrawElement/glDrawArrays)
Is it enough to confirm ?
Is there ...
1
vote
0answers
56 views
OpenGL ES - jagged edge [duplicate]
I need to render roads and some direction marks on top of them. I render roads as triangled geometry, same goes for marks (see picture - road is purple, mark is red, ignore z-fighting).
Problem goes ...
0
votes
0answers
82 views
Are rendering exception due to device or engine?
While developing games/simulations for android using jMonkey, I have noticed whatever that runs on PC doesn’t many times run on android and displays various kinds of exceptions one of them is ...
0
votes
0answers
31 views
Android Object get Jagged at the border
I am new to OpenGL ES 1 in android. My 3D Model border getting Jagged. Please help me to look like a smooth border instead of jagged.
Screenshot : http://i.stack.imgur.com/1Gq83.png
private class ...
0
votes
1answer
65 views
How to set tranparency for one image only in openGL ES in Android?
I code game on Android where I have several sprites.
My goal is to set gl.glColor4f(1f, 1f, 1f, 0.2f) a.e. transparency only for specific image. (I don't like Photoshop).
In my case its image that ...
2
votes
0answers
101 views
OpenGL ES for Samsung 4 - no textures only white rectangles
I have Nexsus 4,Samsung 3 and several HTCs and my game works fine.
When I launch on Samsung 4 I see white rectangles (empty textures),
no errors,
Further, my game uses sensors but I see on ...
2
votes
1answer
190 views
How to scale openGL textures by a ratio based on height/width (or alternative)
I have been able to successfully allow my UI to extend over edges of my game on higher resolutions by using the Android Guide and by implementing this code on the GL10 object:
...
1
vote
1answer
120 views
How to know in OPenGL ES android that one object crosses another?
I have 2 objects on the screen:
static:
non-static:
non-static object moves randomly over the screen.
How do I know that non-static Object cross the "+" (static).
Both objects I draw by using ...
2
votes
1answer
132 views
What is the correct and most efficient approach of streaming vertex data?
Usually, I do this in my current OpenGL ES project (for iOS):
Initialization:
Create two VBO's and one IndexBuffer (since I will use the same indices), same size.
Create two VAO's and configure ...
0
votes
1answer
189 views
How to get drawn Image width/height on the screen with openGL ES on Android?
I need to know how to get drawn image length and width.
I have this code so far where I draw Radar in left top corner with hard-coded coordinates:
int _SRC = R.drawable._item;
...
float ...
2
votes
2answers
444 views
How do I clip an image in OpenGL ES on Android?
My game involves "wiping off" an image by touch:
After moving a finger over it, it looks like this:
At the moment, I'm implementing it with Canvas, like this:
9Paint pTouch;
9int X = ...
1
vote
0answers
118 views
multi-threading for openGL in Android?
In my old game based on canvas and bitmaps I used surfaceHolder and Thread to call onDraw:
public class GameThread extends Thread {
private SurfaceHolder _surfaceHolder;
private ScreenObjectsView ...
2
votes
2answers
111 views
Using two shaders instead of one with IF statements
I've been working on porting a relatively large opengl ES 1.1 source to ES 2.0.
In OpenGL ES 2.0 (which means, everything uses shaders), I want to draw a teapot three times.
The first one, with a ...
3
votes
2answers
108 views
How to change dynamically vertices during call “draw” method?
I'm new in openGL world and I try to figure out followed problem:
How can I change size/zoom dynamically for my spritesheet.
This class represents some creature fetched from spritesheet and animate ...
4
votes
1answer
61 views
Is it possible to apply a texture inside a GL_LINE_LOOP?
I am creating a game using Box2D and OpenGL ES 1.1.
I am taking the b2PolygonShape vertices and converting them into an OpenGL ES 1.1 GL_LINE_LOOP. The debugging view looks great, but now I want to ...
0
votes
0answers
130 views
How are OpenGL ES 1 framebuffers and textures sized?
I am trying to draw to a texture using a framebuffer using OpenGL ES 1.1 on Android, Java. Afterwords I want to overlay this texture full-screen over my game. In theory, this works like a charm, but ...
0
votes
0answers
71 views
Motorola Defy (CyanogenMod) and OpenGL ES textures
My friend tested my game on a Motorola Defy (with CyanogenMod v4.x, I don't remember exact version number, and she is not reachable now).
My game uses OpenGL ES (v1.1, and in another activity, v2.0). ...
0
votes
0answers
76 views
Android , why GLSurfaceview output is different in Various Devices (Google Nexux7,Samsung Galaxy Note II)
I have created an android app for drawing of lines,circles.. by using
GLSurfaceView in OpenGLES 2.0 like an Auto cad app.
The app works well with Google Nexus 7, in the sense that if we draw a ...
-1
votes
2answers
503 views
How to create a projection matrix in OpenGL ES 2.0 [closed]
So I have the following...
float s = 0.5f;
void renderFrameLine() {
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
GLfloat vVertices[] = { s, s, ...
0
votes
1answer
208 views
Rendering Texture Quad to Screen or FBO (OpenGL ES)
I need to render the texture on the iOS device's screen or a render-to-texture frame buffer object. But it does not show any texture. It's all black.
(I am loading texture with image myself for ...
0
votes
1answer
190 views
Android/OpenGL ES2: How do I set fragment shader value using C;
This should be easy So I am using the following to create a fragment shader.
GLbyte fShaderStr[] = "precision mediump float;"
"void main() \n"
"{ ...
0
votes
0answers
94 views
Android: Using touch does not go to center
I have a simple OpenGL app that draws a circle, I want to move the circle based on where a person touches the screen. The problem is, OpenGL sees the height and width as -1 to 1, whereas Android sees ...
2
votes
2answers
543 views
OpenGL ES 2.0: 2D game rendering, no performance gain with glDraw call batching
I just did a small benchmark. To my surprise batching sprites into a single draw call doesn't give any significant performance boost. Following are my results:
Hardware: iPod touch 4
Extra info: ...
7
votes
1answer
447 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
233 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 ...
1
vote
2answers
163 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
262 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
146 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
80 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
124 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;
...
2
votes
0answers
55 views
OpenGL ES Single Bitplane Texture (or something close)
I'm looking to use a texture to store single bits (or a low number of bits, two or three). This in of itself isn't hard if you're using nearest neighbor sampling with some bit plane unpacking. The ...
0
votes
0answers
65 views
Cocos2d/Box2d Component based entity system
Recently I've read somewhere that it is not a good idea to inherit from CCSprite class when making your game objects. In my CBES each Game Object has :
-PhysicsComponent(responsible for updating ...
1
vote
1answer
112 views
Switching from OpenGL ES 1.0 to 2.0
I have been developing an Android app using OpenGL 1.0 for quite some time using a naive approach to rendering, basically making a call to glColor4f(...) and glDrawArrays(...) with FloatBuffers each ...
-1
votes
1answer
112 views
Why doesn't onSurfaceCreated ever run in this code?
I create my game element this way in my activity:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mGame = new Game(this);
mGame.bootstrap();
...
1
vote
0answers
117 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. ...
1
vote
0answers
53 views
Android opengles how to use glunproject
How to use glunproject in my android app?
I have the following parts in my engine:
A projection matrix
A view matrix for the camera
A model matrix for each of the objects in my world. This matrix ...
0
votes
1answer
234 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 ...
