69 lines
1.8 KiB
GLSL
69 lines
1.8 KiB
GLSL
/* SPDX-FileCopyrightText: 2020-2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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/* Clips point to near clip plane before perspective divide. */
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vec4 clip_line_point_homogeneous_space(vec4 p, vec4 q)
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{
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if (p.z < -p.w) {
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/* Just solves p + (q - p) * A; for A when p.z / p.w = -1.0. */
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float denom = q.z - p.z + q.w - p.w;
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if (denom == 0.0) {
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/* No solution. */
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return p;
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}
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float A = (-p.z - p.w) / denom;
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p = p + (q - p) * A;
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}
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return p;
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}
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void do_vertex(const int i, vec4 pos, vec2 ofs)
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{
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#if defined(UNIFORM)
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interp_out.final_color = color;
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#elif defined(FLAT)
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/* WATCH: Assuming last provoking vertex. */
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interp_out.final_color = interp_in[1].final_color;
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#elif defined(SMOOTH)
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interp_out.final_color = interp_in[i].final_color;
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#endif
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#ifdef CLIP
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interp_out.clip = interp_in[i].clip;
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#endif
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interp_noperspective_out.smoothline = (lineWidth + SMOOTH_WIDTH * float(lineSmooth)) * 0.5;
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gl_Position = pos;
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gl_Position.xy += ofs * pos.w;
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gpu_EmitVertex();
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interp_noperspective_out.smoothline = -(lineWidth + SMOOTH_WIDTH * float(lineSmooth)) * 0.5;
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gl_Position = pos;
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gl_Position.xy -= ofs * pos.w;
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gpu_EmitVertex();
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}
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void main(void)
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{
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vec4 p0 = clip_line_point_homogeneous_space(gl_in[0].gl_Position, gl_in[1].gl_Position);
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vec4 p1 = clip_line_point_homogeneous_space(gl_in[1].gl_Position, gl_in[0].gl_Position);
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vec2 e = normalize(((p1.xy / p1.w) - (p0.xy / p0.w)) * viewportSize.xy);
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#if 0 /* Hard turn when line direction changes quadrant. */
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e = abs(e);
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vec2 ofs = (e.x > e.y) ? vec2(0.0, 1.0 / e.x) : vec2(1.0 / e.y, 0.0);
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#else /* Use perpendicular direction. */
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vec2 ofs = vec2(-e.y, e.x);
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#endif
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ofs /= viewportSize.xy;
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ofs *= lineWidth + SMOOTH_WIDTH * float(lineSmooth);
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do_vertex(0, p0, ofs);
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do_vertex(1, p1, ofs);
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EndPrimitive();
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}
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