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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/.
*
*/
#ifndef INCLUDED_VCL_INC_OPENGL_VERTEXUTILS_H
#define INCLUDED_VCL_INC_OPENGL_VERTEXUTILS_H
#include <basegfx/numeric/ftools.hxx>
#include <epoxy/gl.h>
#include <glm/gtx/norm.hpp>
#include <tools/color.hxx>
#include <vector>
namespace vcl
{
namespace vertex
{
template<GLenum TYPE>
inline void addRectangle(std::vector<GLfloat>& rVertices, GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2);
template<>
inline void addRectangle<GL_TRIANGLES>(std::vector<GLfloat>& rVertices, GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2)
{
rVertices.insert(rVertices.end(), {
x1, y1, x2, y1, x1, y2,
x1, y2, x2, y1, x2, y2
});
}
template<>
inline void addRectangle<GL_TRIANGLE_FAN>(std::vector<GLfloat>& rVertices, GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2)
{
rVertices.insert(rVertices.end(), {
x1, y2, x1, y1,
x2, y1, x2, y2
});
}
inline void createColor(Color nColor, GLfloat fTransparency, GLubyte& nR, GLubyte& nG, GLubyte& nB, GLubyte& nA)
{
nR = nColor.GetRed();
nG = nColor.GetGreen();
nB = nColor.GetBlue();
nA = (1.0f - fTransparency) * 255.0f;
}
template<GLenum TYPE>
inline void addQuadColors(std::vector<GLubyte>& rColors, Color nColor, GLfloat fTransparency);
template<>
inline void addQuadColors<GL_TRIANGLES>(std::vector<GLubyte>& rColors, Color nColor, GLfloat fTransparency)
{
GLubyte nR, nG, nB, nA;
createColor(nColor, fTransparency, nR, nG, nB, nA);
rColors.insert(rColors.end(), {
nR, nG, nB, nA,
nR, nG, nB, nA,
nR, nG, nB, nA,
nR, nG, nB, nA,
nR, nG, nB, nA,
nR, nG, nB, nA,
});
}
inline void addLineSegmentVertices(std::vector<GLfloat>& rVertices, std::vector<GLfloat>& rExtrusionVectors,
glm::vec2 prevPoint, glm::vec2 prevExtrusionVector, GLfloat prevLength,
glm::vec2 currPoint, glm::vec2 currExtrusionVector, GLfloat currLength)
{
rVertices.insert(rVertices.end(), {
prevPoint.x, prevPoint.y,
prevPoint.x, prevPoint.y,
currPoint.x, currPoint.y,
currPoint.x, currPoint.y,
prevPoint.x, prevPoint.y,
currPoint.x, currPoint.y,
});
rExtrusionVectors.insert(rExtrusionVectors.end(), {
-prevExtrusionVector.x, -prevExtrusionVector.y, -prevLength,
prevExtrusionVector.x, prevExtrusionVector.y, prevLength,
-currExtrusionVector.x, -currExtrusionVector.y, -currLength,
-currExtrusionVector.x, -currExtrusionVector.y, -currLength,
prevExtrusionVector.x, prevExtrusionVector.y, prevLength,
currExtrusionVector.x, currExtrusionVector.y, currLength,
});
}
inline glm::vec2 normalize(const glm::vec2& vector)
{
if (glm::length(vector) > 0.0)
return glm::normalize(vector);
return vector;
}
inline glm::vec2 perpendicular(const glm::vec2& vector)
{
return glm::vec2(-vector.y, vector.x);
}
inline float lineVectorAngle(const glm::vec2& previous, const glm::vec2& next)
{
float angle = std::atan2(previous.x * next.y - previous.y * next.x,
previous.x * next.x + previous.y * next.y);
return F_PI - std::fabs(angle);
}
}} // end vcl::vertex
#endif // INCLUDED_VCL_INC_OPENGL_VERTEXUTILS_H
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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