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blender-archive/source/blender/draw/modes/shaders/object_particle_dot_vert.glsl

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GLSL

uniform float pixel_size;
uniform float size;
in vec3 pos;
in float val;
out vec4 radii;
flat out float finalVal;
void main()
{
vec3 world_pos = point_object_to_world(pos);
float view_z = dot(ViewMatrixInverse[2].xyz, world_pos - ViewMatrixInverse[3].xyz);
bool is_persp = (ProjectionMatrix[3][3] == 0.0);
float psize = (is_persp) ? (size / (-view_z * pixel_size)) : (size / pixel_size);
gl_Position = point_world_to_ndc(world_pos);
gl_PointSize = psize;
// calculate concentric radii in pixels
float radius = 0.5 * psize;
// start at the outside and progress toward the center
radii[0] = radius;
radii[1] = radius - 1.0;
radii[2] = radius - 1.0;
radii[3] = radius - 2.0;
// convert to PointCoord units
radii /= psize;
finalVal = val;
}