acorn_shader.js

var acornFragShader = 
"#ifdef GL_ES\n" +
"  precision highp float;\n" +
"#endif\n" +

"varying vec4 frontColor;" +
"void main(void){" +
"  gl_FragColor = frontColor;" +
"}";

var acornVertShader = 
"varying vec4 frontColor;" +

"attribute vec3 ps_Vertex;" +
"attribute vec3 ps_Normal;" +
"attribute vec4 ps_Color;" +

"uniform float ps_PointSize;" +
"uniform vec3 ps_Attenuation;" +

"uniform mat4 ps_ModelViewMatrix;" +
"uniform mat4 ps_ProjectionMatrix;" +
"uniform mat4 ps_NormalMatrix;" +

"void PointLight(inout vec3 col, in vec3 ecPos, in vec3 vertNormal) {" +
"  vec3 VP = -ecPos;" +
"  VP = normalize(VP);" +
"  float nDotVP = max(0.0, dot(vertNormal, VP));" +
"  col = vec3(1.0, 1.0, 1.0) * nDotVP;" +
"}" +

"void main(void) {" +
"  vec3 transNorm = vec3(ps_NormalMatrix * vec4(ps_Normal, 0.0));" + 

"  vec4 ecPos4 = ps_ModelViewMatrix * vec4(ps_Vertex, 1.0);" +
"  vec3 ecPos = (vec3(ecPos4))/ecPos4.w;" +

"  vec3 col;" +
"  PointLight(col, ecPos, transNorm);" +
   
"  frontColor = ps_Color * vec4(col, 1.0);" +

"  float dist = length(ecPos4);" +
"  float attn = ps_Attenuation[0] + " +
"              (ps_Attenuation[1] * dist) + " + 
"              (ps_Attenuation[2] * dist * dist);" +

"  gl_PointSize = ps_PointSize * sqrt(1.0/attn);" +
"  gl_Position = ps_ProjectionMatrix * ecPos4;" +
"}";