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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#version 150
layout(triangles) in;
layout(triangle_strip, max_vertices=27) out;
in mat4 modelViewProjectionMatrix[];
uniform float hexagonSize;
uniform sampler2D permTexture;
out vec2 texturePosition;
out float fuzz;
out vec2 v_center;
out vec3 normal;
const float expandFactor = 0.0318;
float snoise(vec2 p)
{
return texture2D(permTexture, p).r;
}
void emitHexagonVertex(vec3 center, vec2 translation)
{
vec4 pos = vec4(center + hexagonSize * expandFactor * vec3(translation, 0.0), 1.0);
gl_Position = modelViewProjectionMatrix[0] * pos;
texturePosition = vec2((pos.x + 1), (1 - pos.y)) / 2;
EmitVertex();
}
void main()
{
vec2 translateVectors[6];
translateVectors[0] = vec2(-3, -2);
translateVectors[1] = vec2(0, -4);
translateVectors[2] = vec2(3, -2);
translateVectors[3] = vec2(3, 2);
translateVectors[4] = vec2(0, 4);
translateVectors[5] = vec2(-3, 2);
vec3 center = gl_in[0].gl_Position.xyz;
v_center = (1 + center.xy) / 2;
fuzz = snoise(center.xy);
// Draw “walls” to the hexagons.
if (hexagonSize < 1.0) {
vec3 rearCenter = vec3(center.xy, -0.3);
normal = vec3(0.0, 0.0, 0.3);
emitHexagonVertex(center, translateVectors[5]);
emitHexagonVertex(rearCenter, translateVectors[5]);
for (int i = 0; i < 6; ++i) {
emitHexagonVertex(center, translateVectors[i]);
emitHexagonVertex(rearCenter, translateVectors[i]);
}
EndPrimitive();
}
// Draw the main hexagon part.
normal = vec3(0.0, 0.0, 1.0);
emitHexagonVertex(center, translateVectors[5]);
for (int i = 0; i < 6; ++i) {
emitHexagonVertex(center, translateVectors[i]);
emitHexagonVertex(center, vec2(0.0, 0.0));
}
EndPrimitive();
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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