Asking for shader example calrification

I am following this thread:
topic393.html
(Various questions about shaders)

It’s quite helpful.
But now I have my own questions.

I am literally just copying thier example. Where i find my self stuck, is the actual glsl shader.
The given code, is missing a little bit. I got it semi-working, but just adding that to the PS part of the terrain, shader, while leaving everything.
But that doesnt mean i understand it.

I tried to trim it way down, since i assume it is only doing one task

glsl:

[code]#include “Uniforms.glsl”
#include “Samplers.glsl”
#include “Transform.glsl”

varying vec2 vTexCoord;
varying vec4 vWorldPos;

void VS()
{
mat4 modelMatrix = iModelMatrix;
vec3 worldPos = GetWorldPos(modelMatrix);
gl_Position = GetClipPos(worldPos);
vTexCoord = vec3(GetTexCoord(iTexCoord), GetDepth(gl_Position));
vWorldPos = vec4(worldPos, GetDepth(gl_Position));
}

void PS()
{
float cx = mod(vWorldPos.x,10);
float cz = mod(vWorldPos.z,10);
float e = 0.5;

if(!((cx > 10.0-e && cx < 10.0+e) || (cz > 10.0-e && cz < 10.0+e)) ) {//inside a square
  float dist = max(abs(cx-5.0), abs(cz-5.0)) / 10.0;
  if(dist > 0.8) dist * 0.5;
  gl_FragColor = vec4(0.0, 0.0, 0.0, dist);
}else{ //outside a square
  gl_FragColor = normalize(vec4(1.0, 1.0, 1.0, 0.0));
}

}[/code]

material xml:

<material> <technique name="Techniques/TerrainBlend_B.xml" /> </material>

The errors i get the most are:
“unexpected NEW_IDENTIFIER, expecting $end” or
"unexpected ‘}’, expecting $end"

Just guessing, in all the shaders i notice a lot of ifthen blocks, but i have no idea what that is doing really

[code] #ifdef PERPIXEL
#ifdef SHADOW
…
#endif
#ifdef SPOTLIGHT
…
#endif

    #ifdef POINTLIGHT
       ...
    #endif
#else
    #if defined(LIGHTMAP) || defined(AO)
         ...
    #else
        ...
    #endif     
    #ifdef NUMVERTEXLIGHTS
       ...
    #endif
    #ifdef ENVCUBEMAP
       ...
    #endif
#endif[/code]

They dont seem to correlate to the technique or the material or render paths xmls.
Thanks everyone.

I am setting it up as a basic scene in the editor.
And its not throwing specific line errors. in the editors console and the terminal console i get this exactly:

ERROR: Failed to compile vertex shader TerrainBlend_B(): 0:274(2): error: syntax error, unexpected NEW_IDENTIFIER, expecting $end

I will try to set up a basic example in angelscript to see if i get something more specific.

The “ifdef” are used by techniques (psdefines) to customize the generic shader.

made a fast and dirty scene to test it out, outside the editor, and I am getting the same error, no more info than that.
I know its very vague, the current issue. I’m just not entirely sure where to start debugging it.

To pinpoint the error you can use the #line directive https://www.opengl.org/wiki/Core_Language_%28GLSL%29#.23line_directive.
Open the shader in an editor with line numbers, after the #includes add the #line directive specifying its line number. In your case:

4 #include "ScreenPos.glsl" 5 6 #line 6 7 8 varying vec2 vTexCoord;
Now when you see an error like: “0(NNN) : error …”, the error is at line NNN (the zero is the file index, you can use it like “#line 6 3” where 3 is the file index).
Unfortunately, how this is implemented depends on the vendor, so it could not work.
Anyway, I could compile the shader above without errors.