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/**
* @file sunLightF.glsl
*
* $LicenseInfo:firstyear=2007&license=viewerlgpl$
* $/LicenseInfo$
*/
#extension GL_ARB_texture_rectangle : enable
//class 2, shadows, no SSAO
uniform sampler2DRect depthMap;
uniform sampler2DRect normalMap;
uniform sampler2DRectShadow shadowMap0;
uniform sampler2DRectShadow shadowMap1;
uniform sampler2DRectShadow shadowMap2;
uniform sampler2DRectShadow shadowMap3;
uniform sampler2DShadow shadowMap4;
uniform sampler2DShadow shadowMap5;
uniform sampler2D noiseMap;
uniform sampler2D lightFunc;
// Inputs
uniform mat4 shadow_matrix[6];
uniform vec4 shadow_clip;
uniform float ssao_radius;
uniform float ssao_max_radius;
uniform float ssao_factor;
uniform float ssao_factor_inv;
varying vec2 vary_fragcoord;
varying vec4 vary_light;
uniform mat4 inv_proj;
uniform vec2 screen_res;
uniform vec2 shadow_res;
uniform vec2 proj_shadow_res;
uniform float shadow_bias;
uniform float shadow_offset;
uniform float spot_shadow_bias;
uniform float spot_shadow_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;
}
float pcfShadow(sampler2DRectShadow shadowMap, vec4 stc, float scl)
{
stc.xyz /= stc.w;
stc.z += shadow_bias*scl;
float cs = shadow2DRect(shadowMap, stc.xyz).x;
float shadow = cs;
shadow += max(shadow2DRect(shadowMap, stc.xyz+vec3(1.5, 1.5, 0.0)).x, cs);
shadow += max(shadow2DRect(shadowMap, stc.xyz+vec3(1.5, -1.5, 0.0)).x, cs);
shadow += max(shadow2DRect(shadowMap, stc.xyz+vec3(-1.5, 1.5, 0.0)).x, cs);
shadow += max(shadow2DRect(shadowMap, stc.xyz+vec3(-1.5, -1.5, 0.0)).x, cs);
return shadow/5.0;
//return shadow;
}
float pcfShadow(sampler2DShadow shadowMap, vec4 stc, float scl)
{
stc.xyz /= stc.w;
stc.z += spot_shadow_bias*scl;
float cs = shadow2D(shadowMap, stc.xyz).x;
float shadow = cs;
vec2 off = 1.5/proj_shadow_res;
shadow += max(shadow2D(shadowMap, stc.xyz+vec3(off.x, off.y, 0.0)).x, cs);
shadow += max(shadow2D(shadowMap, stc.xyz+vec3(off.x, -off.y, 0.0)).x, cs);
shadow += max(shadow2D(shadowMap, stc.xyz+vec3(-off.x, off.y, 0.0)).x, cs);
shadow += max(shadow2D(shadowMap, stc.xyz+vec3(-off.x, -off.y, 0.0)).x, cs);
return shadow/5.0;
//return shadow;
}
void main()
{
vec2 pos_screen = vary_fragcoord.xy;
//try doing an unproject here
vec4 pos = getPosition(pos_screen);
vec4 nmap4 = texture2DRect(normalMap, pos_screen);
nmap4 = vec4((nmap4.xy-0.5)*2.0,nmap4.z,nmap4.w); // unpack norm
float displace = nmap4.w;
vec3 norm = nmap4.xyz;
/*if (pos.z == 0.0) // do nothing for sky *FIX: REMOVE THIS IF/WHEN THE POSITION MAP IS BEING USED AS A STENCIL
{
gl_FragColor = vec4(0.0); // doesn't matter
return;
}*/
float shadow = 1.0;
float dp_directional_light = max(0.0, dot(norm, vary_light.xyz));
vec3 shadow_pos = pos.xyz + displace*norm;
vec3 offset = vary_light.xyz * (1.0-dp_directional_light);
vec4 spos = vec4(shadow_pos+offset*shadow_offset, 1.0);
if (spos.z > -shadow_clip.w)
{
if (dp_directional_light == 0.0)
{
// if we know this point is facing away from the sun then we know it's in shadow without having to do a squirrelly shadow-map lookup
shadow = 0.0;
}
else
{
vec4 lpos;
if (spos.z < -shadow_clip.z)
{
lpos = shadow_matrix[3]*spos;
lpos.xy *= shadow_res;
shadow = pcfShadow(shadowMap3, lpos, 0.25);
shadow += max((pos.z+shadow_clip.z)/(shadow_clip.z-shadow_clip.w)*2.0-1.0, 0.0);
}
else if (spos.z < -shadow_clip.y)
{
lpos = shadow_matrix[2]*spos;
lpos.xy *= shadow_res;
shadow = pcfShadow(shadowMap2, lpos, 0.5);
}
else if (spos.z < -shadow_clip.x)
{
lpos = shadow_matrix[1]*spos;
lpos.xy *= shadow_res;
shadow = pcfShadow(shadowMap1, lpos, 0.75);
}
else
{
lpos = shadow_matrix[0]*spos;
lpos.xy *= shadow_res;
shadow = pcfShadow(shadowMap0, lpos, 1.0);
}
// take the most-shadowed value out of these two:
// * the blurred sun shadow in the light (shadow) map
// * an unblurred dot product between the sun and this norm
// the goal is to err on the side of most-shadow to fill-in shadow holes and reduce artifacting
shadow = min(shadow, dp_directional_light);
//lpos.xy /= lpos.w*32.0;
//if (fract(lpos.x) < 0.1 || fract(lpos.y) < 0.1)
//{
// shadow = 0.0;
//}
}
}
else
{
// more distant than the shadow map covers
shadow = 1.0;
}
gl_FragColor[0] = shadow;
gl_FragColor[1] = 1.0;
spos = vec4(shadow_pos+norm*spot_shadow_offset, 1.0);
//spotlight shadow 1
vec4 lpos = shadow_matrix[4]*spos;
gl_FragColor[2] = pcfShadow(shadowMap4, lpos, 0.8);
//spotlight shadow 2
lpos = shadow_matrix[5]*spos;
gl_FragColor[3] = pcfShadow(shadowMap5, lpos, 0.8);
//gl_FragColor.rgb = pos.xyz;
//gl_FragColor.b = shadow;
}
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