4
votes
0answers
178 views
+50
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;
...
0
votes
0answers
42 views
OpenGL ES 2.0 - Rendered texture is blank [closed]
I am attempting to render to a texture, then render the texture to the screen, but it always seems to be blank no matter what I do. Can you guys take a look for me and see what I am missing here?
The ...
0
votes
1answer
75 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
44 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
52 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
0answers
69 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. ...
0
votes
1answer
86 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 ( ...
1
vote
1answer
236 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 ...
1
vote
2answers
184 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 ...
0
votes
1answer
240 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 ...
1
vote
2answers
205 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
408 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 ...
1
vote
1answer
118 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 ...
3
votes
1answer
1k views
Sea water shader using only fragment processor
I have a game that runs on mobile devices (OpenGL ES 2.0) and for which I would like to create some sea water using the shaders. Now, the plane on which the sea water texture will be has only 4 ...
1
vote
2answers
309 views
Lights system with shaders in OpenGL?
In more than just 1 occasion, i read about 2 ways of doing a light's system in OpenGL:
normal way? i don't know how to call this one
with the shaders ( GLSL )
The problem is i don't get the ...
6
votes
4answers
450 views
Impact of variable-length loops on GPU shaders
Its popular to render procedural content inside the GPU e.g. in the demoscene (drawing a single quad to fill the screen and letting the GPU compute the pixels).
Ray marching is popular:
This means ...
1
vote
3answers
758 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()
{
...
2
votes
1answer
691 views
Optional samplers in shaders
I have a scene. Sometimes I draw untextured, coloured, semi-transparent triangles, sometimes I texture them, and I draw a lot of both in a fairly interleaved manner.
In a fixed function pipeline the ...
2
votes
1answer
1k views
How can I write only to the stencil buffer in OpenGL ES 2.0?
I'd like to write to the stencil buffer without incurring the cost of my expensive shaders. As I understand it, I write to the stencil buffer as a 'side effect' of rendering something. In this first ...
-1
votes
2answers
635 views
How does OpenGL-ES 2 assemble primitives?
Two things I'm quite confused about.
1) OpenGL ES 2.0 creates primitives before the vertex shader is invoked. Why, then, does it not automatically provide the vertex shader the position of the ...
