Hi robert
thx for your answer
Ok I tried what you said, but I still have a pb.
I made a shader "common.frag" with a basic fog function
Code:
uniform vec3 fogColor;
uniform float fogDensity;
vec3 fog(in vec3 color)
{
const float LOG2 = 1.442695;
float z = gl_FragCoord.z / gl_FragCoord.w;
float fogFactor = exp2(-fogDensity * fogDensity * z * z * LOG2);
fogFactor = clamp(fogFactor, 0.0, 1.0);
return mix(fogColor, color, fogFactor);
}
And I did a "main.frag" with the main function
Code:
void main(void)
{
vec3 color = vec3(1,1,1);
color = fog(color);
gl_FragColor = vec4(color, 1);
}
then I load thoses shaders into one program as fragment shader
Code:
osg::Program* program = new osg::Program;
osg::Shader* shader = new osg::Shader(osg::Shader::FRAGMENT);
shader->loadShaderSourceFromFile("common.frag");
program->addShader(shader);
osg::Shader* shader1 = new osg::Shader(osg::Shader::FRAGMENT);
shader1->loadShaderSourceFromFile("main.frag");
program->addShader(shader1)
But when OSG compile my shader, it fails because "fog" is not known in the main
function.
Any ideas ? If I find the solution I will post...
thanks a lot
Sebastien[/code]
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