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/**
* @file giF.glsl
*
* Copyright (c) 2007-$CurrentYear$, Linden Research, Inc.
* $License$
*/
#extension GL_ARB_texture_rectangle : enable
uniform sampler2DRect depthMap;
uniform sampler2DRect normalMap;
uniform sampler2D noiseMap;
uniform sampler2D diffuseGIMap;
uniform sampler2D normalGIMap;
uniform sampler2D depthGIMap;
uniform sampler2D lightFunc;
// Inputs
varying vec2 vary_fragcoord;
uniform vec2 screen_res;
uniform mat4 inv_proj;
uniform mat4 gi_mat; //gPipeline.mGIMatrix - eye space to sun space
uniform mat4 gi_mat_proj; //gPipeline.mGIMatrixProj - eye space to projected sun space
uniform mat4 gi_norm_mat; //gPipeline.mGINormalMatrix - eye space normal to sun space normal matrix
uniform mat4 gi_inv_proj; //gPipeline.mGIInvProj - projected sun space to sun space
uniform float gi_radius;
uniform float gi_intensity;
uniform int gi_samples;
uniform vec2 gi_kern[25];
uniform vec2 gi_scale;
uniform vec3 gi_quad;
uniform vec3 gi_spec;
uniform float gi_direction_weight;
uniform float gi_light_offset;
vec4 getPosition(vec2 pos_screen)
{
float depth = texture2DRect(depthMap, pos_screen.xy).a;
vec2 sc = pos_screen.xy*2.0;
sc /= screen_res;
sc -= vec2(1.0,1.0);
vec4 ndc = vec4(sc.x, sc.y, 2.0*depth-1.0, 1.0);
vec4 pos = inv_proj * ndc;
pos /= pos.w;
pos.w = 1.0;
return pos;
}
vec4 getGIPosition(vec2 gi_tc)
{
float depth = texture2D(depthGIMap, gi_tc).a;
vec2 sc = gi_tc*2.0;
sc -= vec2(1.0, 1.0);
vec4 ndc = vec4(sc.x, sc.y, 2.0*depth-1.0, 1.0);
vec4 pos = gi_inv_proj*ndc;
pos.xyz /= pos.w;
pos.w = 1.0;
return pos;
}
vec3 giAmbient(vec3 pos, vec3 norm)
{
vec4 gi_c = gi_mat_proj * vec4(pos, 1.0);
gi_c.xyz /= gi_c.w;
vec4 gi_pos = gi_mat*vec4(pos,1.0);
vec3 gi_norm = (gi_norm_mat*vec4(norm,1.0)).xyz;
gi_norm = normalize(gi_norm);
vec2 tcx = gi_norm.xy;
vec2 tcy = gi_norm.yx;
vec4 eye_pos = gi_mat*vec4(0,0,0,1.0);
vec3 eye_dir = normalize(gi_pos.xyz-eye_pos.xyz/eye_pos.w);
//vec3 eye_dir = vec3(0,0,-1);
//eye_dir = (gi_norm_mat*vec4(eye_dir, 1.0)).xyz;
//eye_dir = normalize(eye_dir);
//float round_x = gi_scale.x;
//float round_y = gi_scale.y;
vec3 debug = texture2D(normalGIMap, gi_c.xy).rgb*0.5+0.5;
debug.xz = vec2(0.0,0.0);
//debug = fract(debug);
float round_x = 1.0/64.0;
float round_y = 1.0/64.0;
//gi_c.x = floor(gi_c.x/round_x+0.5)*round_x;
//gi_c.y = floor(gi_c.y/round_y+0.5)*round_y;
float fda = 0.0;
vec3 fdiff = vec3(0,0,0);
vec3 rcol = vec3(0,0,0);
float fsa = 0.0;
for (int i = -1; i < 2; i+=2 )
{
for (int j = -1; j < 2; j+=2)
{
vec2 tc = vec2(i, j)*0.75;
vec3 nz = texture2D(noiseMap, vary_fragcoord.xy/128.0+tc*0.5).xyz;
//tc += gi_norm.xy*nz.z;
tc += nz.xy*2.0;
tc /= gi_samples;
tc += gi_c.xy;
vec3 lnorm = -normalize(texture2D(normalGIMap, tc.xy).xyz*2.0-1.0);
vec3 lpos = getGIPosition(tc.xy).xyz;
vec3 at = lpos-gi_pos.xyz;
float dist = dot(at,at);
float da = clamp(1.0/(gi_spec.x*dist), 0.0, 1.0);
if (da > 0.0)
{
//add angular attenuation
vec3 ldir = at;
float ang_atten = clamp(dot(ldir, gi_norm), 0.0, 1.0);
float ld = -dot(ldir, lnorm);
if (ang_atten > 0.0 && ld < 0.0)
{
vec3 diff = texture2D(diffuseGIMap, tc.xy).xyz;
da = da*ang_atten;
fda += da;
fdiff += diff*da;
}
}
}
}
fdiff /= max(gi_spec.y*fda, gi_quad.z);
fdiff = clamp(fdiff, vec3(0), vec3(1));
vec3 ret = fda*fdiff;
//ret = ret*ret*gi_quad.x+ret*gi_quad.y+gi_quad.z;
//fda *= nz.z;
//rcol.rgb *= gi_intensity;
//return rcol.rgb+vary_AmblitColor.rgb*0.25;
//return vec4(debug, 0.0);
//return vec4(fda*fdiff, 0.0);
return clamp(ret,vec3(0.0), vec3(1.0));
//return debug.xyz;
}
void main()
{
vec2 pos_screen = vary_fragcoord.xy;
vec4 pos = getPosition(pos_screen);
vec3 norm = texture2DRect(normalMap, pos_screen).xyz;
norm = vec3((norm.xy-0.5)*2.0,norm.z); // unpack norm
gl_FragData[0].xyz = giAmbient(pos, norm);
}
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