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#version 150
#extension GL_ARB_explicit_attrib_location : enable
#extension GL_ARB_explicit_uniform_location : enable
layout(location = 0) out vec4 frag_color ;
layout(location = 8) uniform vec4 lightPos ;
layout(location = 9) uniform float time ;
layout(location = 10) uniform vec4 globalAmbient ;
uniform sampler2D texture ;
uniform sampler2D skytex ;
in vec3 normal ;
in vec4 position ;
in vec2 texpos ;
float dX = 1 / 512.0 ;
float dY = 1 / 512.0 ;
vec4 sample(float xc,float yc) {
return texture2D(texture,texpos + vec2(xc,yc) - vec2(time/20.0,time/20.0));
}
vec3 calNormChange( vec3 norm, vec3 down, vec3 right ) {
float x00 = 1 - length(sample(-dX, dY)) ;
float x01 = 1 - length(sample( 0, dY)) ;
float x02 = 1 - length(sample( dX, dY)) ;
float x10 = 1 - length(sample(-dX, 0)) ;
float x11 = 1 - length(sample( 0, 0)) ;
float x12 = 1 - length(sample( dX, 0)) ;
float x20 = 1 - length(sample(-dX,-dY)) ;
float x21 = 1 - length(sample( 0,-dY)) ;
float x22 = 1 - length(sample( dX,-dY)) ;
down = ((x11 - x00) + (x11 - x01) + (x11 - x02) - (x11 - x20) - (x11 - x21) - (x11 - x22)) * down ;
right = ((x11 - x00) + (x11 - x10) + (x11 - x20) - (x11 - x02) - (x11 - x12) - (x11 - x22)) * right ;
return (right*2 + down*2 + norm) / 5.0 ;
}
in vec3 original_x ;
in vec3 original_z ;
void main() {
vec3 down = vec3( 0, -1, 0 ) ;
vec3 right = normalize(cross( normal, down )) ;
down = normalize(cross( normal, right ) );
vec3 newNorm = calNormChange( normal, down, right ) ;
vec3 camVector = vec3(position) - vec3(0,0,0);
vec3 ref = reflect( normalize(camVector), newNorm ) ;
float tex_x = (dot( ref, original_x ) + 1) / 2;
float tex_y = (dot( ref, original_z ) + 1) / 2;
vec4 refcolor = texture2D(skytex, vec2(tex_x,tex_y));
float coef = dot( normalize(vec3(lightPos) - vec3(position)), normalize(normal) ) * 0.5 + 0.5 ;
// frag_color = vec4( original_z, 1.0 );
// frag_color = vec4(tex_x,tex_y,0,1.0) ;
// vec4 color = sample(0,0);
frag_color = vec4(vec3(refcolor * coef) * vec3(0.6,0.8,1.0),0.8) * vec4(normalize(globalAmbient.xyz),1.0);
// frag_color = vec4(0,0,1,0.8) ;
}
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