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examples/shaders/resources/shaders/glsl100/outline_hull.fs

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+#version 330
+
+out vec4 finalColor;
+
+void main() {
+    finalColor = vec4(0.05, 0.05, 0.05, 1.0);
+}

examples/shaders/resources/shaders/glsl100/outline_hull.vs

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+#version 330
+
+in vec3 vertexPosition;
+in vec3 vertexNormal;
+in vec2 vertexTexCoord;
+in vec4 vertexColor;
+
+uniform mat4  mvp;
+uniform float outlineThickness;
+
+void main() {
+    // Extrude vertex along its normal to create the hull.
+    vec3 extruded = vertexPosition + vertexNormal * outlineThickness;
+    gl_Position   = mvp * vec4(extruded, 1.0);
+}

examples/shaders/resources/shaders/glsl120/outline_hull.fs

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+#version 330
+
+out vec4 finalColor;
+
+void main() {
+    finalColor = vec4(0.05, 0.05, 0.05, 1.0);
+}

examples/shaders/resources/shaders/glsl120/outline_hull.vs

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+#version 330
+
+in vec3 vertexPosition;
+in vec3 vertexNormal;
+in vec2 vertexTexCoord;
+in vec4 vertexColor;
+
+uniform mat4  mvp;
+uniform float outlineThickness;
+
+void main() {
+    // Extrude vertex along its normal to create the hull.
+    vec3 extruded = vertexPosition + vertexNormal * outlineThickness;
+    gl_Position   = mvp * vec4(extruded, 1.0);
+}