Differential D3505 Diff 11489 source/blender/draw/engines/lanpr/shaders/lanpr_snake_line_connection_geom.glsl

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source/blender/draw/engines/lanpr/shaders/lanpr_snake_line_connection_geom.glsl

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				layout(lines_adjacency) in;
				layout(triangle_strip, max_vertices = 6) out;

				in vec2 gOffset[];

				uniform float LineWidth;
				uniform float TaperLDist;
				uniform float TaperRDist;
				uniform float TaperLStrength;
				uniform float TaperRStrength;


				#define M_PI 3.1415926535897932384626433832795

				vec4 MakeLeftTaperLinear(vec4 L, vec4 a, float offset){
				if (offset >= TaperLDist) return a;
				a = mix(mix(a, L, TaperLStrength), a, offset / TaperLDist);
				return a;
				}

				vec4 MakeRightTaperLinear(vec4 R, vec4 c, float offset){
				if (offset >= TaperRDist) return c;
				c = mix(mix(c, R, TaperRStrength), c, offset / TaperRDist);
				return c;
				}

				void main() {

				float LAngle, RAngle;

				vec4 LL = gl_in[0].gl_Position,
				L = gl_in[1].gl_Position,
				R = gl_in[2].gl_Position,
				RR = gl_in[3].gl_Position;

				float OffsetL = gOffset[1].x;
				float OffsetR = gOffset[2].x;
				float OffsetL2 = gOffset[1].y;
				float OffsetR2 = gOffset[2].y;

				if (L == R \|\| L == LL \|\| R == RR \|\| LL == RR \|\| L == RR \|\| R == LL) return;

				vec4 a;
				vec4 b;
				vec4 c;
				vec4 d;
				vec4 Line = R - L;
				vec4 Normal = normalize(vec4(-Line.y, Line.x, 0, 0));

				a = L - LineWidth * Normal * 0.001;
				b = L + LineWidth * Normal * 0.001;
				c = R - LineWidth * Normal * 0.001;
				d = R + LineWidth * Normal * 0.001;

				float lim = LineWidth * 0.002;

				{
				vec4 Tangent = normalize(normalize(L - LL) + normalize(R - L));
				vec4 Minter = normalize(vec4(-Tangent.y, Tangent.x, 0, 0));
				float length = LineWidth / (dot(Minter, Normal)) * 0.001;
				a = L - length * Minter;
				b = L + length * Minter;
				if (distance(a, b) > 2 * lim) { a = L - lim * Minter; b = L + lim * Minter;}
				}

				{
				vec4 Tangent = normalize(normalize(RR - R) + normalize(R - L));
				vec4 Minter = normalize(vec4(-Tangent.y, Tangent.x, 0, 0));
				float length = LineWidth / (dot(Minter, Normal)) * 0.001;
				c = R - length * Minter;
				d = R + length * Minter;
				if (distance(c, d) > 2 * lim) { c = R - lim * Minter; d = R + lim * Minter;}
				}

				a = MakeLeftTaperLinear(L, a, OffsetL);
				b = MakeLeftTaperLinear(L, b, OffsetL);
				c = MakeLeftTaperLinear(R, c, OffsetR);
				d = MakeLeftTaperLinear(R, d, OffsetR);

				a = MakeRightTaperLinear(L, a, OffsetL2);
				b = MakeRightTaperLinear(L, b, OffsetL2);
				c = MakeRightTaperLinear(R, c, OffsetR2);
				d = MakeRightTaperLinear(R, d, OffsetR2);

				a.w = 1;
				b.w = 1;
				c.w = 1;
				d.w = 1;

				gl_Position = a;
				EmitVertex();
				gl_Position = b;
				EmitVertex();
				gl_Position = c;
				EmitVertex();
				EndPrimitive();

				gl_Position = c;
				EmitVertex();
				gl_Position = d;
				EmitVertex();
				gl_Position = b;
				EmitVertex();
				EndPrimitive();
				}