Questions tagged [opengl-es]

Subset of the OpenGL 3D graphics API designed for embedded devices such as mobile phones.

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Lighting of clouds billboards

I created billboards of clouds that always face the camera in OpenGL. Now I want to add some lighting effects and maybe simulate a scattering light effect. I experimented with phong shading but my ...
JadGL's user avatar
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2 votes
1 answer
154 views

GLSL wrong data read from attribute

I'm developping an OpenGLes 3.0 app with Java and I started writing the shader code. For some reason, it seems to mix up the attributes data locations and I don't understand why. Here's the code : ...
Gyoo's user avatar
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1 vote
1 answer
105 views

Texture loading issue with open gl es on android

I'm programming an app with OpenGL ES on Android in Java. The app uses 9 textures during a render loop pass. A depth, position, normal, albedo, noise, SSAO, SSAO blur and two image textures for the ...
Patrick's user avatar
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1 answer
146 views

Convert Wavefront (OBJ) faces into triangles for drawing with OpenGLES

I wrote a simple Wavefront parser in C++ that loads v, vn, vt and ...
Alexey Starinsky's user avatar
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1 answer
208 views

How to apply sampler2Darray textures to different locations of a single mesh?

In openGL, I have a 3D terrain composed of a grid of 255x255 vertices. The vertex of the lower left corner is at coordinates (-127;-127) and the one of the upper right corner is at coordinates (127;...
Greelings's user avatar
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1 answer
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Most but not all quads appear corrupted when passing matrix and colour using VBO for instanced rendering

I was trying to batch quads with the same texture and blend mode into the single draw call using glDrawElementsInstanced. As long as I use just a position, texture ...
Anton Grant's user avatar
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0 answers
51 views

Jagged peak artifacts on terrain

My terrain rendering shows these jagged peaks along the edges of some hills: Why do these occur, and how can I fix this? Here is the code I use to initialize my surface and draw a frame: ...
Ramazan ŞAHİN's user avatar
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1 answer
495 views

The performance gains of tiled rendering on mobile

I'm making an OpenGL es app on android and I'm trying to improve the performance of it. I found this technique called tiled rendering (not the same thing as tiled deffered rendering*) wich divides the ...
Gyoo's user avatar
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140 views

What's the solution to this kind of shadow acne?

I'm working with a OpenGL ES/GLSL homebrew engine my company developed, in C++. Below is a screenshot of it rendering shadow acne. The light's direction is too perpendicular to the face of the curve ...
KiraHoneybee's user avatar
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1 answer
160 views

How to update constant buffer patially in OpenGLES

I am wondering what does glMapBufferRange actually do? I am accessing my constant buffer like this way: ...
TIANLUN ZHU's user avatar
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26 views

handling obj file without normal [duplicate]

I am trying to build an obj file loader and I have written code to read an obj file with face f with v/vt/vn - vertex, texture coordinate, and normal. While going through the obj file, there are so ...
Pravin Poudel's user avatar
1 vote
0 answers
1k views

OpenGL Compute Shader vs Fragment Shader device support

I have a game with massively parallelizable logic, which I intend to write calculate on the GPU (Java/LibGDX). I am planning to implement a logic for it through a fragment shader, instead of a compute ...
Dávid Tóth's user avatar
2 votes
1 answer
2k views

Any fast alternative to sine in GLSL?

Should I just use the built-in sin() function or my custom sine function? I'm concerned about performance here. I don't care about accuracy much here because I use it to just get wave effects in my ...
devendran's user avatar
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74 views

Cuda API to render using Physically Based Rendering (PBR) in OpenGL-ES based project

I need to develop a OpenGL-ES based application to render a model using Physically based Rendering (PBR). Do I need to use Cuda API to render the computation intense PBR rendering? Is there any ...
Arun AC's user avatar
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1 answer
214 views

OpenGL GLSL ES 3.10 - Referencing a uniform variable, causes the vertex shader to not draw anything

I have this project, that has a default shader, that just draws models and textures. Recently I decided to add a second shader that does a fancy effect, and is used only on some of the objects drawn. ...
Tom Tsagkatos's user avatar
1 vote
1 answer
137 views

Bind render result to texture id

I want to save the result screen of the rendering and then apply another shader on that result, the typical way is to read the screen using glReadPixels and then buffer that image to gpu and then ...
Bahi Ali's user avatar
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44 views

NDK opengl-es unknown error

Projection matrix? Renderer? Where is the error? I recently started studying NDK to create better performing android games ... but ... An error I didn't expect to deal with appeared a few weeks ago ...
Yuu's user avatar
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1 vote
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OpenGL ES - render to texture - how to preserve original depth buffer

I render to texture and attach my own depth buffer that has texture target. However, after I finish rendering I would like to set original depth buffer back. To start rendering to texture I do: ...
Martin Perry's user avatar
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1 vote
1 answer
241 views

Why do I have additional glBindBuffer() calls?

I have a OpenGL2/OpenGLES2 application and it among others renders a sphere using the following pseudocode: Update vertices data on CPU call glBufferSubData(GL_ARRAY_BUFFER, ...) to update them on ...
blackcat's user avatar
1 vote
0 answers
246 views

Techniques for cursor snap-to-vertex in WebGL or OpenGL?

What's a technique for snapping the mouse pointer to vertices in WebGL or OpenGL? All I need is the vertex position, no other info. Ideally, I'd like to do this without needing to keep positions and ...
xeolabs's user avatar
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1 answer
609 views

How can I fix the artifacts near the shadow edges in my variance shadow map?

I'm trying to implement variance shadow mapping in my engine. I'm using WebGL 2 and now I have only one directional light source. It's working, but it has a serious issue near the shadow edges and I ...
racz16's user avatar
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2 answers
271 views

OpenGL ES model loader is slow?

I'm trying to load a 3D model in OpenGL ES, and I managed to find a project on "sourceForge" that can do this job. When I downloaded it and played the app, it took 50 second to load a small object (...
Osama's user avatar
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4 votes
2 answers
2k views

How to preserve EGL context when pausing Android ndk app

I am trying to improve openframeworks so that the GL context is preserved when pausing and resuming my game. So that I don't have to reload all textures after each pause. I don't expect you to know ...
Ivorne's user avatar
  • 181
0 votes
1 answer
116 views

OpenGL ES, object intersection artifacts

I was developing a C++ implementation of OpenGL for Android and I noticed those weird artifacts that formed between 2 intersecting objects (or triangles) : [Here are the artifacts on Android] The ...
Ross Myhovych's user avatar
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124 views

How do i update opengl lightning equation in my fragment shader to make my texture less glossy and more like a fabric

I built a model in blender, and am currently trying to import it into my android app using assimp together with opengl, i dont have any issues with the importing but my goal is to make the object look ...
Distjoy's user avatar
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1 answer
248 views

PVRCT Texture Format with glTexStorage2D on Open GL 3.0 ES How?

I've looked everywhere and I can't seem to find the answer. How can I use glTexStorage2D with PVRCT textures? I've done this: ...
Marvg's user avatar
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0 votes
2 answers
763 views

Rotating a Quad in Shader

I'm working Opengles2 and I have a just a texture ID and a quad from an SDK and its shader, and I can not access their code, just the vertex and pixel shader. The quad from the SDK is rotated and ...
andre ahmed's user avatar
1 vote
2 answers
416 views

Draw text in OpenGL ES 3D game?

I am making a game using OpenGL ES 1.0 and I want to keep player score. So I need to draw text dinamically. What is the best approach? Some library, textures, bitmaps? I tried to use TextView but ...
Jon Doe's user avatar
  • 11
3 votes
2 answers
1k views

How to make the camera follow the player in Libgdx?

In Play class I have the viewport of game height=320 and game width=240unitswith camera cam. I have set the camera(cam) viewport width to 10 and viewport height to 7.I have another camera hud whose ...
satya's user avatar
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2 votes
1 answer
1k views

How to associate multiple arrays of vertex data and uv data with an attribute? OpenGL ES

I create the buffers to to put on them the vertex data and uv data: ...
Dr. Mundo's user avatar
2 votes
1 answer
47 views

How to transform only part of an array in OpenGL ES?

I have one texture atlas of which I select the "non-animated textures", I put all vertex and UV coordinates in two array: ...
Dr. Mundo's user avatar
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1 answer
830 views

Black screen when trying to render multiple textures

I generate an array for two textures: ...
Dr. Mundo's user avatar
0 votes
1 answer
207 views

OpenGL ES texture rendered not as expected with disproportional aspect ratio triangles

I cannot seem to understand how texture coordinates work. I try to render a texture into two triangles and this is what I get Where the expected output is a normal continuous image as you can imagine....
Yaroslav Mytkalyk's user avatar
3 votes
1 answer
611 views

OpenGL ES 2.0 cannot understand how to use 2D ortho projection and shaders

I am migrating an app that draws on OpenGL ES 1.0 to OpenGL ES 2.0. The app used to draw multiple 2D triangles, as a vertex array, where the vertices matched the pixels on screen. I made a sample ...
Yaroslav Mytkalyk's user avatar
0 votes
1 answer
203 views

Issues to display a texture loaded with libPNG with opengles 3.0

I'm trying to load a texture loaded with libPNG on a XY coordinates. I know the width and the height of the texture (32x32). The texture is already loaded successfully and I have his Id. Here is my ...
X6Entrepreneur's user avatar
0 votes
0 answers
78 views

Rendering artifacts on edges in Cardboard VR OpenGL ES 2

Unity beginner here. I've encountered this weird rendering artifacts in my Cardboard VR app on Android OpenGL ES 2: https://youtu.be/uJm4d3MwbRo It doesn't occur in WebGL build: http://senovsky.wz.cz/...
Nikola Šenovský's user avatar
3 votes
3 answers
2k views

What are "free vertex indices" in WebGL 2 and how do they relate to geometry shaders?

In January Notch tweeted about WebGL 2: WebGL 2 is happening. Bye, compatibility! Hello, 3d textures and pixel buffers! oh god it's got free vertex indices in the shader. That is basically a geometry ...
JoJnr's user avatar
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1 vote
1 answer
164 views

Texture does not fit the screen

Hi guys I am really new in OpenGL-ES and I am developing a simple android application with NDK, and I just want to ask why the image is not fit after I set the width and height of it. this is my <...
dotGitignore's user avatar
1 vote
0 answers
107 views

How to update FBO's depth texture?

I have an FBO with only 16-bit depth attachment: glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT16, w, h, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_SHORT, nullptr); I ...
ovk's user avatar
  • 131
1 vote
2 answers
2k views

Correct normal map for rotated sprites

I am trying to find the best way to correctly do normal mapping in a 2D batched sprite renderer. For each sprite sheet (aka texture atlas) I render all sprites as a textured quads with a single <...
ovk's user avatar
  • 131
5 votes
1 answer
234 views

OpenGL self-test in a mobile game

I've made an Android game that uses no/custom game engine. It renders using OpenGL ES 2.0 and optionally uses some extensions for optimization or extra effects. Over the time I have dealt with various ...
michalsrb's user avatar
  • 166
0 votes
1 answer
367 views

GLSL - Stencil buffer - instanced geometry

I have geometry that have attached some "ID" data. I have generated stencil buffer, that holds these IDs. Now, in second pass, I render different geometry, but this time I need to mask it with ...
Martin Perry's user avatar
  • 1,106
1 vote
1 answer
118 views

How can I port my Gear VR app (Java, OpenGL ES) to Unity?

I want to port my Gear VR app (created in Java using the official framework) to Unity, so I can also support Microsoft's new-ish VR headsets (not talking about the Hololens!). In my current app I'm ...
Neph's user avatar
  • 267
1 vote
3 answers
538 views

Android: 2d scrolling background

I am a very beginner in game development. All I want to achieve in the beginning is a free scrollable background like in a strategy game with my custom graphics. In my case it is supposed to be a 2d ...
Kewitschka's user avatar
0 votes
1 answer
463 views

Most efficient way of drawing a lot of cubes OpenGL ES

I have to draw a lot of cubes in my OpenGL programme for android. All the cubes have the same size but different colors. I know that calling glDrawArrays is expensive operation so I should call it ...
Jon Doe's user avatar
  • 17
4 votes
1 answer
80 views

How can I simulate a crash of OpenGL in GLKViewController to help track down a user's problem?

I am using GLKViewController for iOS app. On some devices, there are problems (possibly with OpenGL), that I am unable to solve, because I dont see this problem on ...
Martin Perry's user avatar
  • 1,106
0 votes
3 answers
2k views

OpenGL ES 2.0 Shadow Mapping - depth only FBO not working due to GL_FRAMEBUFFER_INCOMPLETE_ATTACHMEN

I am trying to add simple shadow mapping to my friends gles 2.0 app. It is based on gles 2.0 and PowerVR SDK. The problem I encounter is that FBO is not valid due to ...
Kacper Kleczewski's user avatar
1 vote
0 answers
102 views

Android - OpenGL - detect slow GPU

I have app for Android with OpenGL. It uses GPU-heavy effects and on "slow" GPUs this leads to low FPS. Is there a way, how to detect "slow" GPU during app start and disable those effects and generate ...
Martin Perry's user avatar
  • 1,106
1 vote
1 answer
338 views

Is Opengl 2.x still usable? [closed]

i've used opengl core profile for a while now and i was wondering if it was possible to create a "decent" application (like a game/game engine) with good graphics. I have a machine which can run only ...
user avatar
0 votes
1 answer
836 views

GLfloat vs GLfixed vs GLint performance in 2017

Some people claim that floats should be used for rendering vertices in modern graphics cards, because graphics cards are optimized for floating-point arithmetic and therefore, integer calculations are ...
Cpp plus 1's user avatar

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