axmol/tests/cpp-tests/Source/shaders/example_Julia.fsh

42 lines
922 B
GLSL

#version 310 es
precision highp float;
precision highp int;
// Shader from http://www.iquilezles.org/apps/shadertoy/
layout(std140, binding = 0) uniform fs_ub {
vec2 center;
vec2 resolution;
vec2 u_screenSize;
vec4 u_Time;
};
layout(location = 0) out vec4 FragColor;
void main(void)
{
float time = u_Time[1];
#ifdef METAL
vec2 fragCoord = vec2(gl_FragCoord.x, u_screenSize.y - gl_FragCoord.y);
#else
vec2 fragCoord = gl_FragCoord.xy;
#endif
vec2 p = 2.0 * (fragCoord - center.xy) / resolution.xy;
vec2 cc = vec2( cos(.25*time), sin(.25*time*1.423) );
float dmin = 1000.0;
vec2 z = p*vec2(1.33,1.0);
for( int i=0; i<64; i++ )
{
z = cc + vec2( z.x*z.x - z.y*z.y, 2.0*z.x*z.y );
float m2 = dot(z,z);
if( m2>100.0 ) break;
dmin=min(dmin,m2);
}
float color = sqrt(sqrt(dmin))*0.7;
FragColor = vec4(color,color,color,1.0);
}