#include "sun_frag.h"

const char* shader_sun_frag = "varying lowp vec4 VertexColor; \n"
" \n"
"#ifdef GL_ES \n"
"precision mediump float; \n"
"#endif \n"
" \n"
"uniform vec2 u_resolution; \n"
" \n"
"vec2 skew (vec2 st) { \n"
"    vec2 r = vec2(0.0); \n"
"    r.x = 1.1547*st.x; \n"
"    r.y = st.y+0.5*r.x; \n"
"    return r; \n"
"} \n"
" \n"
"vec3 simplexGrid (vec2 st) { \n"
"    vec3 xyz = vec3(0.0); \n"
" \n"
"    vec2 p = fract(skew(st)); \n"
"    if (p.x > p.y) { \n"
"        xyz.xy = 1.0-vec2(p.x,p.y-p.x); \n"
"        xyz.z = p.y; \n"
"    } else { \n"
"        xyz.yz = 1.0-vec2(p.x-p.y,p.y); \n"
"        xyz.x = p.x; \n"
"    } \n"
" \n"
"    return fract(xyz); \n"
"} \n"
" \n"
"void main() { \n"
"    vec2 st = gl_FragCoord.xy/u_resolution.xy; \n"
"    vec3 color = VertexColor.xyz \n"
" \n"
"    // Scale the space to see the grid \n"
"    st *= 10.; \n"
" \n"
"    // Show the 2D grid \n"
"    color.rg = fract(st); \n"
" \n"
"    // Skew the 2D grid \n"
"    // color.rg = fract(skew(st)); \n"
" \n"
"    // Subdivide the grid into to equilateral triangles \n"
"    // color = simplexGrid(st); \n"
" \n"
"    gl_FragColor = vec4(color,1.0); \n"
"} \n"
" \n";