Shader problem
Hi,
I am using an example shader from Shader Designer from http://www.typhoonlabs.com (toon.frag and toon.vert). The shader, in shader designer is a cartoonish shader, but loaded into my program, it makes everything black.
The fragment shader is using the variables DiffuseColor, Phong and PhongColor, not mentioned anywhere in the GLSL reference, i guess thats where my problem occours, but i'm very new to shaders.
Do i need to set these variables my self? - where do they get their from - since it is not a part of the shader either...
In my program, I set up light, normals, materials etc. and i see the objects without the shader.
I tried a couble of example shaders from shader designer, and it seems like a general problem. :(
The shader sources can be found in [Shader Designer\shaders] but i'll list them here too:
// Fragment/Vertex shader for cartoon-style shading
// Author: Philip Rideout
// Copyright (c) 2004 3Dlabs Inc. Ltd.
// See 3Dlabs-License.txt for license information
uniform vec3 DiffuseColor;
uniform vec3 PhongColor;
uniform float Edge;
uniform float Phong;
varying vec3 Normal;
void main (void){
vec3 color = DiffuseColor;
float f = dot(vec3(0,0,1),Normal);
if (abs(f) < Edge)
color = vec3(0);
if (f > Phong)
color = PhongColor;
gl_FragColor = vec4(color, 1);
}
.vert:
varying vec3 Normal;
void main(void){
Normal = normalize(gl_NormalMatrix * gl_Normal);
gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
}
You need to set the values for all the uniform variables (as you already surmised). It's been a while for me, so I can't give you detailed help, but if you check out the glUniform functions you should be able to set them with that.
You have forgotten to set the uniform variables. http://nehe.gamedev.net/data/lessons/lesson.asp?lesson=47
this is an example of how to use cg shaders in opengl.
this is an example of how to use cg shaders in opengl.
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