doctorhandshake

I'm a newbie to writing shaders and getting an error reporting

on all 3 of my supposedly exposed parameters from a simple shader.

I've included a test patch I'm using and both the frag and vert shaders as well as the JXS file as I'm honestly not sure where to look for the issue.

The shader behavior doesn't seem to be as expected either but I'll cross that bridge when I get the parameters exposed...

I'm a newbie to writing shaders and getting an error reporting 

 on all 3 of my supposedly exposed parameters from a simple shader.

unable-to-bind-glsl-uniform-param

Ah crap shows what a newbie I am ... can't attach the GLSL files so bodies copied below.

    circleColor = vec4(0.0,0.3,1.0,1.0);

    vec4 center = vec4(0.0,0.0,0.0,0.0);

    float convertedHeight = vertexPosition.y * 0.5;

    vec4 position = vec4(vertexPosition.x, convertedHeight, vertexPosition.z, vertexPosition.a);

    float alpha =distance(position.xy, center.xy);

    alpha = alpha * circleSizeModifier;

    gl_FragColor = vec4(circleColor.x, circleColor.y, circleColor.z, alpha* circleColor.a);

varying vec4 vertexPosition;
varying vec4 circleColor;
varying float intensity;
varying float circleSizeModifier;

void main()
{
	intensity = 1.65;
	circleColor = vec4(0.0,0.3,1.0,1.0);
	circleSizeModifier = 4.0;

	gl_Position = ftransform();
	vertexPosition = gl_Position;

void main()
{
//	gl_FragColor = gl_Color;
	vec4 center = vec4(0.0,0.0,0.0,0.0);
	float convertedHeight = vertexPosition.y * 0.5;

	vec4 position = vec4(vertexPosition.x, convertedHeight, vertexPosition.z, vertexPosition.a);
	float alpha =distance(position.xy, center.xy);
	alpha = alpha * circleSizeModifier;
	alpha = pow(alpha , intensity);

	gl_FragColor = vec4(circleColor.x, circleColor.y, circleColor.z, alpha* circleColor.a);

you've declared 3 parameters in your JXS, and have bound them to your fragment program.

those need to be declared as "uniform" in your glsl code, not "varying", and should only be declared in the program you bound them to (fp - fragment program in your case).

you've declared 3 parameters in your JXS, and have bound them to your fragment program.
those need to be declared as "uniform" in your glsl code, not "varying", and should only be declared in the program you bound them to (fp - fragment program in your case).


Thank you so much, Rob - you got me on the right track and the shader is now running without errors.

Now as to the other bit about getting it to behave as expected, gonna start a new thread.

unable to bind GLSL uniform param