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21
English forum / Re: Shadertoy multipass demos
« Last post by Stefan on February 08, 2016, 01:04:48 PM »
Some MP shaders use new uniforms
uniform int       iFrame;
uniform float     iTimeDelta; (appears only in FireFox shader editor)


interactive evolution
3d pseudo fluid volume
Diffusion Curves


What goes around comes around:
Post process - FXAA
FXAA code from: geeks3d
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3D-Tech News Around The Web / Re: Shadertoy - Elephant
« Last post by JeGX on February 07, 2016, 08:34:17 PM »
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English forum / Shadertoy multipass demos
« Last post by JeGX on February 07, 2016, 08:33:15 PM »
I'm preparing a small framework (Lua) for Shadertoy multipass demos.

This simple (and pleasing) multipass demo works fine in GeeXLab:
https://www.shadertoy.com/view/Msc3Wf


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English forum / GeeXLab 0.9.5.1 released
« Last post by JeGX on February 07, 2016, 05:45:05 PM »
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3D-Tech News Around The Web / Re: Shadertoy - Elephant
« Last post by JeGX on February 07, 2016, 05:43:25 PM »

Excellent, but i don't know how to port those multipass shaders to GeeXLab  :-[


I will work on it, GeeXLab should have all we need to port Shadertoy MP shaders...
26
3D-Tech News Around The Web / Shadertoy - Elephant
« Last post by Stefan on February 07, 2016, 03:49:36 PM »
Quote
Elephant

Signed distance field raymarching. Procedural elephants. Or a bunch of ellipsoids and few lines and a couple of quadratic curves. Split it in layers to prevent the compiler from crashing. The art is composed to camera. It runs very slow, but it looks good!

Excellent, but i don't know how to port those multipass shaders to GeeXLab  :-[

27
English forum / Re: How to use video texture in a GLSL Shader
« Last post by Stefan on February 07, 2016, 10:16:08 AM »
>>>download updated package<<<

Note: i didn't get the 3 layers in  "Page curl effect" look right


"video heightfield" flipped via -pixel.y

"The Tender Cut [TV]" added - uses video and keyboard texture

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English forum / Re: How to use video texture in a GLSL Shader
« Last post by Stefan on February 05, 2016, 07:18:14 PM »
>>>Here is a package with 13 demos<<< - d/l below

These demos use http://hwcdn.net/j9t9v3v5/cds/Suzie_H264.mp4 from http://www.elementaltechnologies.com/resources/4k-test-sequences
It is licensed under a Creative Commons Attribution-NoDerivs 3.0 Unported License.

If this 4K video crashes GeeXLab on exit or reload, use the shrunk video in the package.

Some shaders use iChannelTime[0] - to calculate the length of the video i assume

In the demos it looks like this:

uniform float iChannelTime0;
...
float time = iChannelTime0;
 
gh_gpu_program.uniform1f(shadertoy_prog, "iChannelTime0", video_elapsed_time)

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English forum / NanoVG + GeeXLab on Raspberry Pi
« Last post by JeGX on February 05, 2016, 04:29:53 PM »
NanoVG + GeeXLab work fine on Raspberry Pi:

30
English forum / How to build User Interfaces and 2D Shapes with NanoVG
« Last post by JeGX on February 05, 2016, 04:28:07 PM »
The support of NanoVG is one of the latest features of GeeXLab 0.9.5.0. Here is a tutorial to use new NanoVG functions of GeeXLab:

http://www.geeks3d.com/hacklab/20160205/how-to-build-user-interfaces-and-2d-shapes-with-nanovg/




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