73 lines
2 KiB
Plaintext
73 lines
2 KiB
Plaintext
uniform int nr_lights;
|
|
|
|
varying vec3 q_tilde;
|
|
varying vec3 inv_T_square_v;
|
|
varying vec3 inv_T_square_e_c;
|
|
varying vec4 ev_clip;
|
|
varying vec3 v;
|
|
//varying vec3 h[4];
|
|
//varying vec3 l[4];
|
|
varying vec4 a;
|
|
//varying vec4 d;
|
|
varying vec4 s;
|
|
|
|
void main()
|
|
{
|
|
// decompress the matrix T
|
|
float R = gl_Vertex.w;
|
|
float inv_R = 1.0/R;
|
|
|
|
// determine eye point in parameter space
|
|
vec3 e = gl_ModelViewMatrixInverse[3].xyz;
|
|
vec3 e_tilde = inv_R*(e - gl_Vertex.xyz);
|
|
|
|
// compute helper
|
|
float inv_e_square = 1.0/dot(e_tilde,e_tilde);
|
|
|
|
// determine silhoutte center in parameter space
|
|
vec3 m_tilde = inv_e_square*e_tilde;
|
|
|
|
// determine radius of silhouette in parameter space
|
|
float r = sqrt(1.0-inv_e_square);
|
|
|
|
// compute vector x of length r orthogonal to e in parameter space
|
|
vec3 x_tilde = r*normalize(cross(gl_ModelViewMatrixInverse[1].xyz,e_tilde));
|
|
|
|
// compute vector y of length r orthogonal to x and e in parameter space
|
|
vec3 y_tilde = r*normalize(cross(e_tilde,x_tilde));
|
|
|
|
// compute the corner point in homogeneous object coordinates
|
|
vec3 V_tilde = m_tilde+gl_MultiTexCoord2.x*x_tilde+gl_MultiTexCoord2.y*y_tilde;
|
|
vec3 v_tilde = V_tilde - e_tilde;
|
|
|
|
vec4 V;
|
|
V.xyz = R*V_tilde+gl_Vertex.xyz;
|
|
V.w = 1.0;
|
|
|
|
q_tilde.xy = gl_MultiTexCoord2.xy;
|
|
q_tilde.z = sqrt(inv_e_square);
|
|
|
|
// compute vector from eye to vertex in eye space
|
|
v = (gl_ModelViewMatrix*V).xyz;
|
|
|
|
// compute components to compute normal in eye space
|
|
inv_T_square_e_c = gl_NormalMatrix*(e_tilde);
|
|
inv_T_square_v = gl_NormalMatrix*(v_tilde);
|
|
|
|
v = -normalize(v);
|
|
|
|
gl_Position = gl_ModelViewProjectionMatrix * V;
|
|
ev_clip.xy = (gl_ModelViewProjectionMatrix * gl_ModelViewMatrixInverse[3]).zw;
|
|
ev_clip.zw = gl_Position.zw - ev_clip.xy;
|
|
a = vec4(0.0,0.0,0.0,0.0);
|
|
|
|
vec4 lpos;
|
|
|
|
for (int i=0; i<nr_lights; ++i) {
|
|
a += gl_LightSource[i].ambient*gl_Color;
|
|
}
|
|
|
|
gl_FrontColor = gl_Color;
|
|
//d = gl_Color;
|
|
s = gl_FrontMaterial.specular;
|
|
} |