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
Version number not supported by gl2 in andengine
I am new to andengine. From various forums, i got to know that my system should support hardware virtulisation. I have installed "Intel X86" and my system didn't throw any problem regarding "HAX" now. ...
0
votes
1answer
34 views
OpenGLES 2.0 batching method and do not draw inactive object
I am researching about "batching" objects for one big VBO and reduce draw call.
These are what I am doing now:
Create interleaved VBO based on texture or render state (like Blending)
So, for ...
1
vote
0answers
40 views
How do you tell OpenGL ES 2.0 to use a texture as the depth buffer?
I want to render a scene with an outline post processing effect in OpenGL ES 2.0.
First I render all the opaque objects. Then I use a post processing shader
for silhouette detection that uses the ...
0
votes
1answer
99 views
GLSL: What's generally better for converting a -1 or 1 value to 0 or 1?
I'm writing a shader for rendering both sides of triangles with different colors. I have a value mediump float back = dot(V, N) which is positive if the normal faces away from the camera and negative ...
3
votes
1answer
102 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 ...
1
vote
1answer
27 views
Orthogonal projection matrix affecting z-buffer on one device
I am experimenting using Matrix.orthoM for a isometric projection, rather than Matrix.frustumM.
On one device, the z buffering does not appear to be working correctly and I get a cut away effect seen ...
1
vote
2answers
67 views
OpenGL ES - DrawCalls count - bottleneck?
I am newbie to OpenGL ES (so far, I used mainly DX11). Now for my scene, I have about 100 draw calls. I can use instancing, but only about half of objects can be instanced, so draw calls count would ...
-2
votes
1answer
72 views
Can't get indices with VBO working [closed]
I'm learning opengl for a few days only. Now I'm trying to use indices for my cube, but can't get it working, I don't see anything on screen.
struct Vertex
{
GLfloat position[3];
GLfloat ...
0
votes
1answer
54 views
When to call GLBindTexture when using a spite-sheet?
Originally, I was using individual textures (ie, individual .png files) for my sprite's animation and recently altered my code so that I could put all my animation frames into 1 file (so it basically ...
0
votes
0answers
19 views
Problems with GLES2 and NativeActivity
I have a NativeActivity that uses the following to set the background...
static const char gVertexShader[] =
"attribute vec4 vPosition;\n"
"void main() {\n"
" ...
5
votes
1answer
102 views
Sprite with alpha Blending in 3D world
I'm working on a game in a 3D world with elements 2D only (Like Don't starve game) for Android and IOS.
Currently, I've managed "Sprite" without alpha blending, I've just put a condition in the pixel ...
1
vote
2answers
80 views
How to flip a quad (openGL es 2.0 Android / Java)
bHow would one go about 'flipping' a quad i.e., either horizontally or vertically? (Just a single quad, not everything in view).
I know how to rotate a quad, this is my rotation method:
public void ...
0
votes
1answer
83 views
ParallaxBackground AndEngine
I'm new to game development andengine. I want to add ParallaxBackground but I don't know how to change background on player move. I'm using arrow for moving a player. Now my question is where I write ...
5
votes
2answers
371 views
GLSL Shader - Change Hue/Saturation/Brightness
I'm trying to change the hue of an image using a GLSL fragment shader. I want to achieve something similar to Photoshop's Hue/Saturation Adjustment layer.
In the following image you can see what I've ...
1
vote
1answer
40 views
GLES2-AnchorCenter branch has no org.andengine.util.color.Color
I am porting my game from GLES2 to GLES2-AnchorCenter branch. I am using
import org.andengine.util.HorizontalAlign;
import org.andengine.util.color.Color;
import ...
6
votes
1answer
111 views
How to prevent clipping when moving through a tunnel?
I'm developing for Android using OpenGL ES 2.0.
It's going to be a game where you have to fly through a tunnel without hitting the walls.
However, the tunnel wall gets clipped as the player ...
2
votes
1answer
107 views
re-using objects
I'm working with openGL ES 2.0 on Android and I've created a custom 'Quad' class.
This allows me to make a sprite object like so:
Quad mySprite = new Quad();
mySprite.setSize(w,h);
...
1
vote
1answer
100 views
How to deal with lot of textures in one draw call?
I'am currently developing text rendering & some kind of tile based texturing for simple landscape with textures blending. e.g. something like this but in 3D.
In first realization I have been used ...
2
votes
1answer
146 views
Keeping everything within one Activity
Overview
My game is currently based on a single activity (rather than multiple activities) and I would like to keep it that way.
At the moment, it goes straight into the game at level 1. I will ...
0
votes
0answers
54 views
GLRenderer will not run when resuming app
I'm displaying a dialogue over my GLRenderer and then dismissing it from my Renderer's onSurfaceChanged method (once all resources have loaded and just before rendering starts)
When I first run my ...
0
votes
0answers
68 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
vote
0answers
101 views
How to implement OpenGL triple buffering
I'm trying to implement the triple buffering described here ...
0
votes
1answer
64 views
OpenGL ES - write code in Windows
Is it possible to write application using OpenGL ES 2.0 "emulator" from AMD (AMD OpenGL ES SDK) and then use the same code (compile again, of course) in my iOS / Android / Whatever application ? The ...
0
votes
2answers
70 views
Scale Matrix Transform without moving primitive
So I have the following....
GLbyte vShaderStr[] =
"attribute vec4 vPosition; \n"
"uniform mat4 move; \n"
"uniform mat4 scale; \n"
"void main() \n"
"{ ...
1
vote
2answers
195 views
Simple Android loading screen when using OpenGL
My game uses openGL ES 2.0 on Android and it's got to the point where the pause (while loading resources) has become noticeable.
All I'm after is to show a static screen (probably via an XML layout ...
0
votes
0answers
31 views
NPOT texture and video memory usage
In this QA, @KromStern is saying that NPOT will take memory as much as next POT sized texture. It means it doesn't give any benefit than POT texture with proper management. (maybe even worse because ...
2
votes
1answer
79 views
Full-screen post-processing and texture size
I am newbie writing a post-processing code for mobile devices, and asking some trivial, conventional solution for a specific problem.
AFAIK, post-processing in OpenGL is trivially done with FBO bound ...
0
votes
3answers
86 views
Rotating each quad in a batch separately?
Background
In my app I use the following code to rotate my quad:
Code
//Rotate the quad
Matrix.setIdentityM(mRotationMatrix, 0);
Matrix.translateM(mRotationMatrix, 0, centreX, centreY, 0f);
...
1
vote
2answers
205 views
“Non-additive” alpha blending in OpenGL ES 2.0, Android (AndEngine)
I have several monochromatic sprites and I render them with alpha = 0.25 (all of them the same value). I want to "paint" with them, so when they overlap, the alpha won't be added. I am not sure if I ...
1
vote
2answers
149 views
Libgdx: Am I abusing Vector2? Is there a better way to do my position updates and rendering?
I'm simulating hair in a game. Currently I have a HairField object, which has a position defined by a Vector2. Each HairField has multiple Hair objects in a list, each with a position defined by a ...
0
votes
1answer
50 views
OpenGL ES 2.0: Texture does not appear to be correct [closed]
Here are my shaders...
GLbyte vShaderStr[] = "attribute vec4 vPosition; \n"
"attribute vec2 texPosition; \n"
"attribute vec4 inColor; \n"
"varying vec4 fragColor; \n"
"varying vec2 ...
2
votes
1answer
180 views
Combining 2D and 3D in game engine
I've implemented basic 3D functionality and made little "2.5D" demo in orthographic projection using OpenGL ES 2 and Box2D.
Now I want to make completely two-dimensional game (using sprites) and ...
0
votes
1answer
63 views
OpenGL ES2: Changing Z doesn't appear to change the location of triangle
So I am very new to OpenGL out I am playing around and trying to create a rectangle.
GLfloat vVertices[] = { -0.5f, -0.5f, 0.0f, -0.5f, 0.5f, 0.0f, 0.5f, -0.5f,
0.0f,0.5f,0.5f,0.0f};
...
7
votes
1answer
176 views
GL ES: Fragment shader optimization
Summary:
I get FPS slowdown as soon as I try to tint the sprites (i.e: multiply texture with color in the fragment shader)
Details:
Hardware: iPod touch 4
I am drawing 700 sprites on the screen ...
2
votes
2answers
339 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
0answers
365 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
176 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 ...
6
votes
1answer
277 views
Android game loop's effect on cpu/battery usage - unexpected results
I will try to keep this question as concise and as readable as I can.
I recently came across an odd problem with my Android game that I'm developing.
It's an openGL ES 2.0 game and initially I was ...
0
votes
0answers
120 views
How to render alpha channeled animated 2D sprites in OpenGL ES 2.0
I searched, but I can't find specifically how to render animated 2D sprites with an alpha channel onto a 3D polygon, z=0, in OpenGL ES 2.0.
This is just a basic 2D concept, but since I'm using, ...
1
vote
1answer
53 views
I have a frag shader, one with an empty s_lightMap, how and why is it effecting the output?
I have an image of concrete rocks of different shades of colors, and I'm applying this shader, but without referencing s_lightMap's uniform in my program:
precision mediump float; ...
1
vote
1answer
74 views
Centering GLViewport position within physical screen
I'm developing my app on one device and want it to display at the same ratio on all other devices.
Currently what I have is 'image 1' in my image below - the game fits perfectly onto my development ...
-1
votes
1answer
90 views
Specifying 3D objects in a game [closed]
I have hands on experience in OpenGLES 2.0 , OpenGL and wish to apply the same in a 3D game development in Android.
My idea is to develop a Combat game having fighter planes. I am trying to create a ...
1
vote
2answers
130 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
218 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
140 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
71 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
111 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;
...
1
vote
1answer
193 views
How would one render dynamic vertices in OpenGL ES 2.0 like in a 3D modeling program?
Is there an easy way to re-render dynamic vertices in OpenGL ES 2.0 so that one could, for example, make a modeling program?
I understand how to make a dynamic vertex array, but what I don't ...
-1
votes
1answer
135 views
How can one make multiple movable images in OpenGL ES 2.0? [closed]
I was wondering, I've only seen examples of OpenGL ES 2.0 where people have used one or perhaps two images. I didn't see multiple images of where they each had independent movement.
What if someone ...
1
vote
1answer
66 views
in an ios open gl es 2 game - is it better to use a few large texture atlas or many small textures
I'm working on new game, this time moving to more 3d objects and open gl es 2. Previous (successful) game was open gl es 1 and mostly 2d. For es 2 I'm developing my own 3d engine.
My 3d artist ...
