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// GLSL CODE
/// 1st Vertex Shader
// Projects points to screen space and rotates normal
// stores output on texture
uniform vec3 eye;
uniform int back_face_culling;
varying vec3 normal_vec;
varying vec3 radius_depth_w;
varying float dist_to_eye;
//varying vec2 pos;
void main(void)
{
float dot = (dot(normalize(eye - gl_Vertex.xyz), gl_Normal));
if ( (back_face_culling == 1) && ((dot < -0.0 ))) {
radius_depth_w.x = 0.0;
// for some reason seting the vector to vec4(0.0) drops
// the performance significantly, at least on the GeForce8800 -- RM 2007-10-19
gl_Position = vec4(1.0);
}
else {
// only rotate point and normal if not culled
vec4 v = gl_ModelViewProjectionMatrix * vec4(gl_Vertex.xyz, 1.0);
normal_vec = normalize(gl_NormalMatrix * gl_Normal);
float radius = gl_Vertex.w;
dist_to_eye = length(eye - gl_Vertex.xyz);
// compute depth value without projection matrix, only modelview
radius_depth_w = vec3(radius, -(gl_ModelViewMatrix * vec4(gl_Vertex.xyz, 1.0)).z, v.w);
//~ pos = vec2 (v.x, v.y) / v.w;
//~ pos = (pos * 0.5) + vec2(0.5);
gl_Position = v;
}
}
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