ScGraph - Fun with livecoding shaders

[Florian Schmidt]

Hi list,

the last few days i hacked a little bit on shader support in ScGraph. It's a dirty hack and mainly just for fun. So, if you ever wanted to play around with vertex and fragment shaders, check this out [1] (beware wrong linebreaks)..

See [2] for a download link. Beware: If you want shader support you have to define HAVE_SHADERS=1 in the Makefile.include. If you want shaders and your GPU doesn't support them scgraph might crash..

I'm working on exposing uniforms, too, so that there is a way to pass data to the shader program from control rate units. Stay tuned.. :D

Regards,

Flo

[1]

n = NetAddr("localhost", 37291)

Server.default = s = Server.new("scgraph", n)

// no more initTree(). Group 1 is created automatically now

// create something that renders something and uses shader program 6

// which is not loaded yet..

{GGLRenderer.gr(GShaderProgram.gr(6,1) + GTranslate.gr(GCube.gr, [SinOsc.kr(1.21212121),SinOsc.kr(1,phase:1),0]))}.play

// create something that renders something and uses shader program 5,

// which is also not loaded yet..

{GGLRenderer.gr(GShaderProgram.gr(5,1) + GTranslate.gr(GCube.gr, [SinOsc.kr(1.21212121),SinOsc.kr(1,phase:1),0]))}.play

// clean up

(

n.sendMsg(

"/clearShaderPrograms"

);

)

// format is ["/loadShaderProgram", index, source1, isVertexShader1, source2, isVertexShader2, ...]

// the sources will get compiled and linked together into a

// shader program indexable by index. Shader programs are shared

// between al GLRenderers.

// set shader program 6. here we only define a fragment shader

(

n.sendMsg

(

"/loadShaderProgram",

6,

"

void main()

{

gl_FragColor = vec4(0.5 + 0.5 * sin(float(gl_FragCoord.x)/10.0),0.5 + 0.5 * sin(float(gl_FragCoord.y)/10.0),0.5 + 0.5 * sin(float(gl_FragCoord.y*gl_FragCoord.x)/100000.0),1.0);

}

",

0);

)

// set shader program 5. this one has a vertex and a fragment shader

(

n.sendMsg

(

"/loadShaderProgram",

5,

"

void main()

{

gl_FragColor = vec4(0.1,0.9,0.1,1.0);

}

",

0,

"

void main(void)

{

vec4 a = gl_Vertex;

a.x = a.x * 0.05 + a.y;

a.y = a.y * 1.5 + 0.2 * a.x;

a.z = a.z * 0.3;

gl_Position = gl_ModelViewProjectionMatrix * a;

}

",

1);

)

[2] http://tapas.affenbande.org/scgraph/scgraph-0.8.tgz

--

Palimm Palimm!

http://tapas.affenbande.org

[LFSaw]

Affengeil!

Till

On 22.06.2008, at 17:05, Florian Schmidt wrote:

>
> Hi list,
>
>
> the last few days i hacked a little bit on shader support in  
> ScGraph. It's a dirty hack and mainly just for fun. So, if you ever  
> wanted to play around with vertex and fragment shaders, check this  
> out [1] (beware wrong linebreaks)..
>
>
> See [2] for a download link. Beware: If you want shader support you  
> have to define HAVE_SHADERS=1 in the Makefile.include. If you want  
> shaders and your GPU doesn't support them scgraph might crash..
>
>
> I'm working on exposing uniforms, too, so that there is a way to  
> pass data to the shader program from control rate units. Stay  
> tuned.. :D
>
>
> Regards,
>
> Flo
>
>
>
> [1]
>
> n = NetAddr("localhost", 37291)
>
> Server.default = s = Server.new("scgraph", n)
>
>
> // no more initTree(). Group 1 is created automatically now
>
>
> // create something that renders something and uses shader program 6
>
> // which is not loaded yet..
>
> {GGLRenderer.gr(GShaderProgram.gr(6,1) + GTranslate.gr(GCube.gr,  
> [SinOsc.kr(1.21212121),SinOsc.kr(1,phase:1),0]))}.play
>
>
> // create something that renders something and uses shader program 5,
>
> // which is also not loaded yet..
>
> {GGLRenderer.gr(GShaderProgram.gr(5,1) + GTranslate.gr(GCube.gr,  
> [SinOsc.kr(1.21212121),SinOsc.kr(1,phase:1),0]))}.play
>
>
>
> // clean up
>
> (
>
> n.sendMsg(
>
> "/clearShaderPrograms"
>
> );
>
> )
>
>
> // format is ["/loadShaderProgram", index, source1, isVertexShader1,  
> source2, isVertexShader2, ...]
>
> // the sources will get compiled and linked together into a
>
> // shader program indexable by index. Shader programs are shared
>
> // between al GLRenderers.
>
>
> // set shader program 6. here we only define a fragment shader
>
> (
>
> n.sendMsg
>
> (
>
> "/loadShaderProgram",
>
> 6,
>
> "
>
> void main()
>
> {
>
> gl_FragColor = vec4(0.5 + 0.5 * sin(float(gl_FragCoord.x)/10.0),0.5  
> + 0.5 * sin(float(gl_FragCoord.y)/10.0),0.5 + 0.5 *  
> sin(float(gl_FragCoord.y*gl_FragCoord.x)/100000.0),1.0);
>
> }
>
> ",
>
> 0);
>
> )
>
>
>
> // set shader program 5. this one has a vertex and a fragment shader
>
> (
>
> n.sendMsg
>
> (
>
> "/loadShaderProgram",
>
> 5,
>
> "
>
> void main()
>
> {
>
> gl_FragColor = vec4(0.1,0.9,0.1,1.0);
>
> }
>
> ",
>
> 0,
>
> "
>
> void main(void)
>
> {
>
> vec4 a = gl_Vertex;
>
> a.x = a.x * 0.05 + a.y;
>
> a.y = a.y * 1.5 + 0.2 * a.x;
>
> a.z = a.z * 0.3;
>
> gl_Position = gl_ModelViewProjectionMatrix * a;
>
> }
>
> ",
>
> 1);
>
> )
>
>
>
> [2] http://tapas.affenbande.org/scgraph/scgraph-0.8.tgz
>
>
>
> --
>
> Palimm Palimm!
>
> http://tapas.affenbande.org
>
>

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