openspades/Resources/Shaders/LongSprite.vs
2013-08-30 21:05:51 +09:00

57 lines
1.5 KiB
GLSL

/*
Copyright (c) 2013 yvt
This file is part of OpenSpades.
OpenSpades is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OpenSpades 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with OpenSpades. If not, see <http://www.gnu.org/licenses/>.
*/
uniform mat4 projectionViewMatrix;
uniform mat4 viewMatrix;
uniform vec3 rightVector;
uniform vec3 upVector;
uniform float fogDistance;
attribute vec3 positionAttribute;
attribute vec2 texCoordAttribute;
attribute vec4 colorAttribute;
varying vec4 color;
varying vec2 texCoord;
varying vec4 fogDensity;
void main() {
vec3 pos = positionAttribute.xyz;
gl_Position = projectionViewMatrix * vec4(pos,1.);
color = colorAttribute;
texCoord = texCoordAttribute;
// fog.
// cannot gamma correct because sprite may be
// alpha-blended.
vec4 viewPos = viewMatrix * vec4(pos,1.);
float distance = length(viewPos.xyz) / fogDistance;
distance = clamp(distance, 0., 1.);
fogDensity = vec4(distance);
fogDensity = pow(fogDensity, vec4(1., .9, .7, 1.));
fogDensity *= fogDensity; // FIXME
}