Guillaume

hello eveyone I try to translate this very simple shadertoy to jit.gl.slab but it's not working, eveything is black.

    <description> Default Slab </description>

texcoord = vec2(gl_TextureMatrix[0] * gl_MultiTexCoord0);

    iResolution = vec2 (abs(gl_TextureMatrix[0][0][0]),abs(gl_TextureMatrix[0][1][1]));

vec2 rand( vec2 p ) { p = vec2( dot(p,vec2(127.1,311.7)), dot(p,vec2(269.5,183.3)) ); return fract(sin(p)*43758.5453); }

gl_FragColor = texture2DRect( iChannel0, uv + strength*(rand(uv)-0.5));

hello eveyone I try to translate this very simple shadertoy to jit.gl.slab but it's not working, eveything is black.

https://www.shadertoy.com/view/4dKBDR

<jittershader name="default">
	<description> Default Slab </description>
	<param name="iChannel0" type="int" default="0" />

		<program name="vp" type="vertex">
<![CDATA[

varying vec2 texcoord;
uniform vec2 iResolution;

void main (void)
{
    gl_Position = ftransform();
    texcoord    = vec2(gl_TextureMatrix[0] * gl_MultiTexCoord0);
	iResolution = vec2 (abs(gl_TextureMatrix[0][0][0]),abs(gl_TextureMatrix[0][1][1]));
}
]]>		
		</program>
		<program name="fp" type="fragment">
<![CDATA[
// FRAGMENT SHADER

varying vec2 texcoord;
uniform float iTime;

vec2 rand( vec2  p ) { p = vec2( dot(p,vec2(127.1,311.7)), dot(p,vec2(269.5,183.3)) ); return fract(sin(p)*43758.5453); }

void main(void)
{
    vec2 uv = texcoord/iResolution.xy;
 

   gl_FragColor = texture2DRect( iChannel0, uv + strength*(rand(uv)-0.5));
}

]]>
		</program>
	</language>
</jittershader>

hello eveyone I try to translate this very simple shadertoy to jit.gl.slab but it's not working, eveything is black.

https://www.shadertoy.

another-shader-from-shadertoy

please bundle this up with a test patch and attach here and i'll take a look

this oughta do it. you don't need vec2 uv = texcoord/iResolution.xy;, just vec2 uv = texcoord.

fast-blur.zip

this oughta do it. you don't need  vec2 uv = texcoord/iResolution.xy;, just vec2 uv = texcoord.

this oughta do it, you don't need to divide your uv coordinates by iResolution.

another shader from shadertoy