69 lines
1.4 KiB
GLSL
69 lines
1.4 KiB
GLSL
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layout(lines) in;
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layout(triangle_strip, max_vertices = 4) out;
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uniform vec4 color;
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uniform vec2 viewportSize;
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uniform float lineWidth;
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#if !defined(UNIFORM)
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in vec4 finalColor_g[];
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#endif
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#ifdef CLIP
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in float clip_g[];
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out float clip;
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#endif
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out vec4 finalColor;
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noperspective out float smoothline;
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#define SMOOTH_WIDTH 1.0
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void do_vertex(const int i, vec2 ofs)
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{
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#if defined(UNIFORM)
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finalColor = color;
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#elif defined(FLAT)
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finalColor = finalColor_g[0];
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#elif defined(SMOOTH)
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finalColor = finalColor_g[i];
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#endif
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#ifdef CLIP
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clip = clip_g[i];
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#endif
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smoothline = (lineWidth + SMOOTH_WIDTH) * 0.5;
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gl_Position = gl_in[i].gl_Position;
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gl_Position.xy += ofs * gl_Position.w;
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EmitVertex();
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smoothline = -(lineWidth + SMOOTH_WIDTH) * 0.5;
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gl_Position = gl_in[i].gl_Position;
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gl_Position.xy -= ofs * gl_Position.w;
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EmitVertex();
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}
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void main(void)
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{
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vec2 p0 = gl_in[0].gl_Position.xy / gl_in[0].gl_Position.w;
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vec2 p1 = gl_in[1].gl_Position.xy / gl_in[1].gl_Position.w;
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vec2 e = normalize((p1 - p0) * 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;
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do_vertex(0, ofs);
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do_vertex(1, ofs);
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EndPrimitive();
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}
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