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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 ;
layout(location = 5) uniform mat4 mvMatrix ;
uniform sampler2D texture ;
uniform sampler2D skytex ;
uniform sampler2D skynight ;
uniform vec4 lightpos ;
uniform float fog ;
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 ;
in vec3 tmpnormal ;
vec4 specular( vec3 a_normal ) {
vec3 difpos = -normalize(vec3(0,0,0) - vec3(position)) ;
difpos = reflect( difpos, a_normal ) ;
vec3 lightpos2 = reflect( reflect( vec3(lightPos), original_x ), original_z );
vec3 diflight = normalize(vec3(lightpos2) - vec3(position)) ;
float d = pow(max(dot( normalize(difpos), -normalize(diflight) ), 0.0 ),100.0);
return vec4(vec3(d),1) ;
}
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 = (abs(dot( ref, original_x )) + 1) / 2;
float tex_y = (abs(dot( ref, original_z )) + 1) / 2;
// vec4 refcolor = texture2D(skytex, vec2(tex_x,tex_y));
vec2 tmpcoord = vec2(tex_x,tex_y) ;
vec4 refcolor =
mix(texture2D(skynight,tmpcoord) * (1-globalAmbient.a),
texture2D(skytex,tmpcoord) * vec4(normalize(globalAmbient.xyz),1),
(globalAmbient.a + 1) / 2) ;
vec3 nlightpos = reflect( vec3(lightPos), vec3(mvMatrix * vec4(0,1,0,1)) ) ;
refcolor += specular( newNorm ) ;
float coef = dot( normalize(vec3(lightPos) - vec3(position)), normalize(normal) ) * 0.5 + 0.5 ;
// frag_color = vec4( 0,0,1, 1.0 );
// frag_color = vec4(tex_x,tex_y,0,1.0) ;
// vec4 color = sample(0,0);
frag_color = vec4(vec3(refcolor) * vec3(0.6,0.8,1.0) / (-position.z*fog+1),0.95) * vec4(normalize(globalAmbient.xyz),1.0);
// frag_color = vec4(0,0,1,0.8) ;
}
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