ptsize.vs

OpeNGL超级宝典源代码. OpeNGL超级宝典源代码.

// ptsize.vs
//
// Generic vertex transformation,
// attenuated point size

void main(void)
{
    // normal MVP transform
    gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;

    vec4 V = gl_ModelViewMatrix * gl_Vertex;

    gl_FrontColor = gl_Color;

    // calculate point size based on distance from eye
    float ptSize = length(V);
    ptSize *= ptSize;
    gl_PointSize = 100000.0 / ptSize;
}