const char *sun_shader_100 = "#version 100\n\
precision mediump float;\
varying vec2 fragTexCoord;\
varying vec4 fragColor;\
uniform vec3 color;\
uniform float sun_radius;\
uniform float start_transperency;\
vec2 offset = vec2(1.0, 1.0);\
float sun_end = 1.0;\
void main()\
{\
  offset.x -= fragTexCoord.x * 2.0;\
  offset.y -= fragTexCoord.y * 2.0;\
  float radius = length(offset);\
  if (radius < sun_radius) {\
    gl_FragColor = vec4(color, 1.0);\
  }\
  else if (radius < sun_end) {\
    float gradient = radius;\
    gradient -= sun_radius;\
    gradient = gradient / (sun_end - sun_radius) * start_transperency;\
    gl_FragColor = vec4(color, start_transperency - gradient);\
  }\
  else {\
    gl_FragColor = vec4(color, 0.0);\
  }\
}";

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