mirror of https://github.com/mosra/magnum.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
69 lines
2.5 KiB
69 lines
2.5 KiB
/* |
|
Copyright © 2010, 2011, 2012 Vladimír Vondruš <mosra@centrum.cz> |
|
|
|
This file is part of Magnum. |
|
|
|
Magnum is free software: you can redistribute it and/or modify |
|
it under the terms of the GNU Lesser General Public License version 3 |
|
only, as published by the Free Software Foundation. |
|
|
|
Magnum is distributed in the hope that it will be useful, |
|
but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
|
GNU Lesser General Public License version 3 for more details. |
|
*/ |
|
|
|
#include "Cylinder.h" |
|
|
|
#include "Math/Constants.h" |
|
|
|
namespace Magnum { namespace Primitives { |
|
|
|
Cylinder::Cylinder(std::uint32_t rings, std::uint32_t segments, GLfloat length, Flags flags): Capsule(segments, flags & Flag::GenerateTextureCoords ? TextureCoords::Generate : TextureCoords::DontGenerate) { |
|
CORRADE_ASSERT(rings >= 1 && segments >= 3, "Cylinder must have at least one ring and three segments", ); |
|
|
|
GLfloat y = length*0.5f; |
|
GLfloat textureCoordsV = flags & Flag::CapEnds ? 1.0f/(length+2.0f) : 0.0f; |
|
|
|
/* Bottom cap */ |
|
if(flags & Flag::CapEnds) { |
|
capVertex(-y, -1.0f, 0.0f); |
|
capVertexRing(-y, textureCoordsV, Vector3::yAxis(-1.0f)); |
|
} |
|
|
|
/* Vertex rings */ |
|
cylinderVertexRings(rings+1, -y, length/rings, textureCoordsV, length/(rings*(flags & Flag::CapEnds ? length + 2.0f : length))); |
|
|
|
/* Top cap */ |
|
if(flags & Flag::CapEnds) { |
|
capVertexRing(y, 1.0f - textureCoordsV, Vector3::yAxis(1.0f)); |
|
capVertex(y, 1.0f, 1.0f); |
|
} |
|
|
|
/* Faces */ |
|
if(flags & Flag::CapEnds) bottomFaceRing(); |
|
faceRings(rings, flags & Flag::CapEnds ? 1 : 0); |
|
if(flags & Flag::CapEnds) topFaceRing(); |
|
} |
|
|
|
void Cylinder::capVertexRing(GLfloat y, GLfloat textureCoordsV, const Vector3& normal) { |
|
GLfloat segmentAngleIncrement = 2*Constants::pi()/segments; |
|
|
|
for(std::uint32_t i = 0; i != segments; ++i) { |
|
GLfloat segmentAngle = i*segmentAngleIncrement; |
|
positions(0)->push_back({std::sin(segmentAngle), y, std::cos(segmentAngle)}); |
|
normals(0)->push_back(normal); |
|
|
|
if(textureCoords == TextureCoords::Generate) |
|
textureCoords2D(0)->push_back({i*1.0f/segments, textureCoordsV}); |
|
} |
|
|
|
/* Duplicate first segment in the ring for additional vertex for texture coordinate */ |
|
if(textureCoords == TextureCoords::Generate) { |
|
positions(0)->push_back((*positions(0))[positions(0)->size()-segments]); |
|
normals(0)->push_back(normal); |
|
textureCoords2D(0)->push_back({1.0f, textureCoordsV}); |
|
} |
|
} |
|
|
|
}}
|
|
|