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/*
Part of the Processing project - http://processing.org
Copyright (c) 2012-15 The Processing Foundation
Copyright (c) 2004-12 Ben Fry and Casey Reas
Copyright (c) 2001-04 Massachusetts Institute of Technology
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation, version 2.1.
This library 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 for more details.
You should have received a copy of the GNU Lesser General
Public License along with this library; if not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330,
Boston, MA 02111-1307 USA
*/
uniform mat4 projectionMatrix;
uniform mat4 modelviewMatrix;
uniform vec4 viewport;
uniform int perspective;
attribute vec4 position;
attribute vec4 color;
attribute vec2 offset;
varying vec4 vertColor;
void main() {
vec4 pos = modelviewMatrix * position;
vec4 clip = projectionMatrix * pos;
// Perspective ---
// convert from world to clip by multiplying with projection scaling factor
// invert Y, projections in Processing invert Y
vec2 perspScale = (projectionMatrix * vec4(1, -1, 0, 0)).xy;
// formula to convert from clip space (range -1..1) to screen space (range 0..[width or height])
// screen_p = (p.xy/p.w + <1,1>) * 0.5 * viewport.zw
// No Perspective ---
// multiply by W (to cancel out division by W later in the pipeline) and
// convert from screen to clip (derived from clip to screen above)
vec2 noPerspScale = clip.w / (0.5 * viewport.zw);
gl_Position.xy = clip.xy + offset.xy * mix(noPerspScale, perspScale, float(perspective > 0));
gl_Position.zw = clip.zw;
vertColor = color;
}
Version data entries
59 entries across 58 versions & 2 rubygems