OpenGL ES 2.0 emphasizes a programmable 3D graphics pipeline (comparing to fixed-function pipeline of OpenGL ES 1.1).

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Libgdx implement 2d drop shadow for transparent sprites

I am a libgdx learner. For an learning application that I am developing using libgdx on android, I need to show drop shadow or glow effect when a sprite is touched. The sprites are created from a ...
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1answer
418 views

Generate ETC2 compressed texture from Android Bitmap in OpenGL ES 2

My app currently uses a lot of textures most of which probably could be compressed quite a lot by using ETC2 (my app runs on 4.4 so i have a lot of devices supporting GLES30), i cannot use ETC1 since ...
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1answer
80 views

Is it possible to look up a texel from a texture in GLES2 GLSL framgent shader without using sampler?

Is there some way I can directly access texture memory from fragment shader in GLES2 GLSL? I don't need the sampler to be involved since I am just using it as a look-up table.
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58 views

Android OpenGLES, getting number of fragments passed depth test/Occlusion Query?

Afeter reading many blogs and searching on Internet, I did not get any sloution for getting number of fragments/pixels which are occludded or not occludded of the object on OpenGL ES3.0 Android ...
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1answer
116 views

Does scaling affect performance in OpenGL? [closed]

I've never been able to understand the best practice in this context. I usually want to ship my game with as minimum size as possible. So whereever possible, I try to use scaling of my graphics. Let's ...
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1answer
200 views

XY Location scaling with varying density screens

I have a phone with resolution H=1280,W=720,Density=2 I have a tablet with resolution H=1216,W=800,Density=1.331 I drew a rectangle on my phone with corners Left,Top (-1.6,1.55), Right,Bottom ...
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0answers
438 views

Export Blender 3D animation to be played by Android OpenGLES

Below code snippet shows the way to export coordinate of bones: def export_bone_matrix(armature, bone, label, file_handler): SystemMatrix = Matrix.Scale(-1, 4, Vector((0, 0, 1))) * ...
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397 views

iOS OpenGLES - Multithread Game loop - Render and Update

I am trying to implementing multi-threaded game loop in iOS. (Actaully, two thread - Render and Update) This is my structure. Update Loop Has logic and at the end of loop, save update state. ...
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478 views

How to create a shining sun in OpenGL ES 2 (on Android)

Let's say I created a space scene in OpenGL ES 2 similar to this one: At the moment my sun is just a small texture similar to the one in the image that I place somewhere far, but it obviously looks ...
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3answers
1k views

Android : glowing/pulsing line/triangle

I would like to create a simple Android app using Opengl ES 2.0 that is showing a simple shape (like line or triangle) that is glowing and pulsing like Nexus X logo in this video : ...
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372 views

Cylinder scrolling / wrap-around world using shaders?

I am making a 2D game using OpenGL ES 2.0 (libgdx), where the world will wrap-around itself on Y-axis. Apart from implementing the "modulo" method in my rendering code, I'm wondering whether it's ...
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2answers
647 views

Error while reading TGA file and doing Texture Cube map

In my program, i read a TGA file with a function like this: char* LoadTGA(char* filename, int* width, int* height, int* bpp); As you can see, this function: return a char array of image data ...
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0answers
335 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 ...
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1answer
79 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; ...
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1answer
1k 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 ...
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533 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 ...
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1answer
503 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 ...
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2answers
314 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 ...
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1answer
684 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; ...
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0answers
2k views

Move a 2D square on y-axis on Android GLES2

I am trying to create a simple game for Android. To start, I am trying to make the square move down the y-axis, but the way I am doing it, it doesn't move the square at all and I can't find any ...
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0answers
1k views

Touchscreen panning in OpenGL ES 2.0

I'm trying to allow the user to pan a 2D scene by using the touch screen. I have tried several methods including translating the projection matrix, translating the view matrix and haven't found ...
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1answer
1k views

Android opengles 2.0 :different resolutions rendering and input

I'm currently developing a sprite based 2D game for android using opengles 2.0. I've got some basic rendering done that mimics the spritebatch functionality of xna (draw sprite, rotation, color). But ...
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3answers
2k views

iOS - pass UIImage to shader as texture

I am trying to pass UIImage to GLSL shader. The fragment shader is: varying highp vec2 textureCoordinate; uniform sampler2D inputImageTexture; uniform sampler2D inputImageTexture2; void main() { ...
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0answers
856 views

Rotation deforming mesh (Opengl ES 2.0)

I'm trying to render a rotating cube on Opengl ES 2.0, using some math classes I wrote (based on a lot of online and offline info) for quaternions, matrixes and the like. As far as I know all the math ...
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1answer
185 views

OpenGL ES 2.0 and atlas

I'm trying to draw elements from a texture atlas with OpenGL ES 2.0 Currently, I'm drawing my elements using something like this in the shader: uniform mat4 uCamera; uniform mat4 uModel; attribute ...
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1answer
73 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 ...
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2answers
364 views

Which code is faster to convert -1 to 0 and 1 to 1?

I'm writing a shader for rendering the 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 ...
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1answer
1k 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 ...
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1answer
789 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: ...
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4answers
2k views

Should I use a VBO if the vertex data changes from time to time?

If I have a very large number of vertices, but they're static for about 70% - 80% of their life time, should I use a VBO for them? If so, what usage should I specify? This doesn't sound like a case ...
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2answers
107 views

Getting the correct texture from an Atlas

I'm writing an OpenGL ES (2.0) app and have a custom Quad class which draws a textured quad for my sprites. Currently, I put the textures of any sprites of the same size into a single file or atlas, ...
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1k views

How to change from 60FPS to 30FPS while keeping things smooth?

Here is my current game loop: final int ticksPerSecond = 60; final int skipTicks = (1000 / ticksPerSecond); float dt = 1f/ticksPerSecond; while(System.currentTimeMillis() > nextGameTick ...
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2answers
1k 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" "{ ...
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3answers
8k views

2D Rendering with OpenGL ES 2.0 on Android (matrices not working)

So I'm trying to render two moving quads, each at different locations. My shaders are as simple as possible (vertices are only transformed by the modelview-projection matrix, there's only one color). ...
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1answer
451 views

Straightforward guidelines for converting OpenGL to OpenGL ES?

Is there a straightforward list of finite steps that I need to follow to convert an OpenGL program into an OpenGL ES that's used on the iPhone and iPad? I'd be using GLKit. I've seen some similar API ...
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1answer
67 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, ...
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2answers
565 views

Accurately measure time between calls to onDrawFrame (Android OpelGL ES 2.0)

I'm trying to sort out some timing issues within my gameloop and I've seen something that I don't understand. The Nexus 10 is supposed to have (as far as I'm aware) a VSync on 60Hz. So that would be ...
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1answer
226 views

Storing object position and rotation

I only superficially understand the idea and I can't find any thorough explanation (partially because I can't find very good keywords to Google - English is not my first language): Although I ...
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1answer
209 views

Normal Map Issues

I'm experiencing a very strange result in my very simple normal map implementation on iOS 7 - OpenGL ES 2.0. I'm only using the bare parameters necessary and I'm also skipping on all the tangent and ...
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1answer
629 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 ...
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1answer
124 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 ...
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1answer
87 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 ...
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1answer
235 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++; ...
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1answer
323 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 ( ...
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3answers
2k views

Using multiple sprite sheets for same object AndEnginge

I have multiple sprite sheets for my object(Parrot) like eating, moving left to right, right to left and much more. I am using AndEngine gles2.0. How should I implement it? Every time I have to use ...
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2answers
1k views

Could someone explain why my world reconstructed from depth position is incorrect?

I am attempting to reconstruct the world position in the fragment shader from a depth texture. I pass in the 8 frustum points in world space and interpolate them across fragments and then interpolate ...
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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 ...
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1answer
45 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 ...
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1answer
278 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 ...
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1answer
163 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 ...