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/*
* Geometry Shader for dashed lines, with uniform multi-color(s), or any single-color, and unary thickness.
*
* Dashed is performed in screen space.
*/
/* Make to be used with dynamic batching so no Model Matrix needed */
uniform mat4 ModelViewProjectionMatrix;
uniform vec2 viewport_size;
/* Uniforms from fragment shader, used here to optimize out useless computation in case of solid line. */
uniform float dash_factor; /* if > 1.0, solid line. */
uniform int num_colors; /* Enabled if > 0, 1 for solid line. */
layout(lines) in;
in vec4 color_vert[];
layout(line_strip, max_vertices = 2) out;
noperspective out float distance_along_line;
noperspective out vec4 color_geom;
void main()
{
vec4 v1 = gl_in[0].gl_Position;
vec4 v2 = gl_in[1].gl_Position;
gl_Position = v1;
color_geom = color_vert[0];
distance_along_line = 0.0f;
EmitVertex();
gl_Position = v2;
color_geom = color_vert[1];
if ((num_colors == 1) || (dash_factor >= 1.0f)) {
/* Solid line, optimize out distance computation! */
distance_along_line = 0.0f;
}
else {
vec2 p1 = (v1.xy / v1.w) * 0.5 + 0.5; // <- device coordinates in [0..1] range.
p1 = p1 * viewport_size; // <- 'virtual' screen coordinates.
vec2 p2 = (v2.xy / v2.w) * 0.5 + 0.5; // <- device coordinates in [0..1] range.
p2 = p2 * viewport_size; // <- 'virtual' screen coordinates.
distance_along_line = distance(p1, p2);
}
EmitVertex();
EndPrimitive();
/* Note: we could also use similar approach as diag_stripes_frag, but this would give us dashed 'anchored'
* to the screen, and not to one end of the line... */
}
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