OpenGL ES 2.0 emphasizes a programmable 3D graphics pipeline (comparing to fixed-function pipeline of OpenGL ES 1.1).
3
votes
1answer
84 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:
...
1
vote
2answers
67 views
How to get a texture from current point of view in OpenGL 2.0 ES?
Probably the title is confusing, but I didn't know how to ask better, sorry about that. What I would like to do is get a bitmap texture that represents exactly what's rendered at one point in time and ...
2
votes
0answers
65 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 ...
1
vote
1answer
136 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 ...
0
votes
1answer
124 views
Which version of AndEngine (gles1 or gles2) should I learn? [closed]
I m new to Game Development. I've chosen AndEngine, but there are 2 versions: gles1 and gles2. I tried sample code from both and found that gles2 code is not run on an emulator, but required an actual ...
0
votes
3answers
80 views
Why doesn't glBindVertexArray work in this case?
From my understanding of what glBindVertexArray does and how it works, the following code should work fine:
First init:
glGenVertexArraysOES(1, &_vertexArray);
...
2
votes
0answers
64 views
Camera - View matrix in Android + openGLES 2
I am trying to use the touch screen on the tablet to control my camera movements and generate the view matrix accordingly.
I get the x and y coordinates of the screen and after doing some sanity ...
0
votes
0answers
74 views
Converting motionevent.getx and motionevent.gety to pixel or Object coordinates in the view
I am trying to draw buttons using OpenGL I have added a Gesture Listener for the GLSurface View now i have motionevent when ever the user touches. My question is how can i convert motionevent.getx and ...
0
votes
0answers
92 views
Can I use a shader with 2 different textures in Cocos2D (x)?
We are evaluating a variety of different graphic engines for use in our game and we want to be able to use 2 different textures for many of our sprite maps. One sprite map would be the standard RGBA ...
3
votes
1answer
94 views
Fill texture with white color
How to paint texture with white color? Example what I mean:
SpriteBatch.setColor changes tint only.
0
votes
0answers
35 views
Understanding fonts generated by bmGlyph
Recently, I've purchased a Mac software for generating textured fonts for use in OpenGL applications.
The software is called bmGlyph.
I used it to generate a simple Arial font output and it gave me:
...
0
votes
1answer
91 views
All of my matrix functions not working? OpenGL ES 2.0
I am trying to make a projection matrix scaling the screen and making a coordination system. For some reason I don't think any of my matrix calling is working... the 3 function I am using are
...
0
votes
1answer
56 views
OpenGL RTT FrameBuffer question and Rendering to texture while sampling it
What i need to do:
Blur the selected texture and pass the texture to another effect for postprocessing.
Notice that i want one texture passed all over.
How do i want to do this:
Bind the FBO ( ...
3
votes
2answers
161 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 ...
1
vote
1answer
67 views
Horizontal scroll only part of the view
I would like to know the best way on how to implement horizontal scrolling to only part of the view and vertical scrolling to complete view. I was able to achieve horizontal and vertical scrolling to ...
0
votes
0answers
66 views
How to dispose of OpenGL resources cleanly on Android
I am creating a framework for OpenGL ES 2.0 for android and my question is how can I cleanly dispose of my OpenGL resources when my android app is done?
I check for isFinished() in the onPause() ...
-1
votes
2answers
133 views
OpenGL 2.0 Android Scrolling Horizontally and Vertically
I am new to OpenGL2.0 in Android. How can I scroll the GLSurfaceView both horizontally and vertically?
1
vote
0answers
210 views
Draw Sphere - order of vertices [closed]
I would like draw sphere in pure OpenGL ES 2.0 without any engines. I write next code:
int GenerateSphere (int Slices, float radius, GLfloat **vertices, GLfloat **colors) {
srand(time(NULL));
int ...
3
votes
3answers
742 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
230 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 ...
1
vote
0answers
66 views
How can I use an unsigned int as a GLSL attribute for OpenGL ES 2
I'm having trouble finding conclusive information on this, but it seems like I can't pass integer attributes to GLSL for OpenGL ES or that if I do they'll be converted to float. I need a value between ...
1
vote
1answer
179 views
How to have qt5 work on desktop like on mobile devices (es2, correct glsl version)?
I am looking for help/information concerning this issue :
My work: I have an opengl es2 render engine that works on an iOS app. I almost managed to make it work by calling the same openGL rendering ...
4
votes
1answer
201 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 ...
3
votes
3answers
308 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 ...
0
votes
0answers
48 views
What could cause dispersed triangles instead of integral model?
So the thing is, I get dispersed triangles instead of model that I'm loading, in this case it's just a cube. It seems as those triangles have no points that connect them. Is there anyone who had this ...
2
votes
2answers
255 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 ...
5
votes
1answer
269 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 ...
12
votes
2answers
298 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
101 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
112 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 ...
2
votes
0answers
211 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
vote
2answers
154 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
223 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
216 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
236 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
157 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
138 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
137 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
271 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
167 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
340 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
358 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
115 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 ...
1
vote
1answer
93 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.
...
2
votes
2answers
509 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
235 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 ...
2
votes
1answer
149 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
297 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
356 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
644 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 ...
