[SSAO and GI maybe ?]

There is more shader code that fixe some problems in the next pages of this post: http://www.gamedev.n...=25&WhichPage=1

 

But it's some HLSL shader code... if it can help you .... Good luck with that

 

Also, the creator of this shader give two important informations if you havent read it yet:

 

- View space position is reconstructed from depth using texture coordinates of the fullscreen quad, no frustum corners required.

- Depth buffer is expected to be linear. So do not use the opengl one, create your own depth shader.

[SSAO and GI maybe ?]

Thanks josh i hope that you will get working

Why those compile errors ?

[SSAO and GI maybe ?]

I hope so

[SSAO and GI maybe ?]

Hello everyone i found an interesting shader that handle, SSAO and Global Illumination, i tried with my very basic knowledge to get it working in LW Engine but no luck at the moment.

 

Maybe someone can help us with that, and maybe this shader can give some ideas to someone, so i post it here. I hope i will be usefull...

 

 

 

 

Here is the post on the gamedev forums: http://www.gamedev.net/community/forums/topic.asp?topic_id=556187&PageSize=25&WhichPage=1

 

Here is the GLSL Source code:

 

uniform sampler2D gnormals;
uniform sampler2D gdepth;
uniform sampler2D gdiffuse;
uniform sampler2D grandom;

vec3 readNormal(in vec2 coord)  
{  
    return normalize(texture2D(gnormals, coord).xyz*2.0  - 1.0);  
}

vec3 posFromDepth(vec2 coord){
    float d = texture2D(gdepth, coord).r;
    vec3 tray = mat3x3(gl_ProjectionMatrixInverse)*vec3((coord.x-0.5)*2.0,(coord.y-0.5)*2.0,1.0);
    return tray*d;
}
   //Ambient Occlusion form factor:
   float aoFF(in vec3 ddiff,in vec3 cnorm, in float c1, in float c2){
         vec3 vv = normalize(ddiff);
         float rd = length(ddiff);
         return (1.0-clamp(dot(readNormal(gl_TexCoord[0]+vec2(c1,c2)),-vv),0.0,1.0)) *
          clamp(dot( cnorm,vv ),0.0,1.0)* 
                (1.0 - 1.0/sqrt(1.0/(rd*rd) + 1.0));
   }
   //GI form factor:
   float giFF(in vec3 ddiff,in vec3 cnorm, in float c1, in float c2){
         vec3 vv = normalize(ddiff);
         float rd = length(ddiff);
         return 1.0*clamp(dot(readNormal(gl_TexCoord[0]+vec2(c1,c2)),-vv),0.0,1.0)*
                    clamp(dot( cnorm,vv ),0.0,1.0)/
                    (rd*rd+1.0);  
   }

void main()
{
   //read current normal,position and color.
   vec3 n = readNormal(gl_TexCoord[0].st);
   vec3 p = posFromDepth(gl_TexCoord[0].st);
   vec3 col = texture2D(gdiffuse, gl_TexCoord[0]).rgb;

   //randomization texture
   vec2 fres = vec2(800.0/128.0*5,600.0/128.0*5);
   vec3 random = texture2D(grandom, gl_TexCoord[0].st*fres.xy);
   random = random*2.0-vec3(1.0);

   //initialize variables:
   float ao = 0.0;
   vec3 gi = vec3(0.0,0.0,0.0);
   float incx = 1.0/800.0*0.1;
   float incy = 1.0/600.0*0.1;
   float pw = incx;
   float ph = incy;
   float cdepth = texture2D(gdepth, gl_TexCoord[0]).r;

   //3 rounds of 8 samples each. 
   for(float i=0.0; i<3.0; ++i) 
   {
      float npw = (pw+0.0007*random.x)/cdepth;
      float nph = (ph+0.0007*random.y)/cdepth;

      vec3 ddiff = posFromDepth(gl_TexCoord[0].st+vec2(npw,nph))-p;
      vec3 ddiff2 = posFromDepth(gl_TexCoord[0].st+vec2(npw,-nph))-p;
      vec3 ddiff3 = posFromDepth(gl_TexCoord[0].st+vec2(-npw,nph))-p;
      vec3 ddiff4 = posFromDepth(gl_TexCoord[0].st+vec2(-npw,-nph))-p;
      vec3 ddiff5 = posFromDepth(gl_TexCoord[0].st+vec2(0,nph))-p;
      vec3 ddiff6 = posFromDepth(gl_TexCoord[0].st+vec2(0,-nph))-p;
      vec3 ddiff7 = posFromDepth(gl_TexCoord[0].st+vec2(npw,0))-p;
      vec3 ddiff8 = posFromDepth(gl_TexCoord[0].st+vec2(-npw,0))-p;

      ao+=  aoFF(ddiff,n,npw,nph);
      ao+=  aoFF(ddiff2,n,npw,-nph);
      ao+=  aoFF(ddiff3,n,-npw,nph);
      ao+=  aoFF(ddiff4,n,-npw,-nph);
      ao+=  aoFF(ddiff5,n,0,nph);
      ao+=  aoFF(ddiff6,n,0,-nph);
      ao+=  aoFF(ddiff7,n,npw,0);
      ao+=  aoFF(ddiff8,n,-npw,0);

      gi+=  giFF(ddiff,n,npw,nph)*texture2D(gdiffuse, gl_TexCoord[0]+vec2(npw,nph)).rgb;
      gi+=  giFF(ddiff2,n,npw,-nph)*texture2D(gdiffuse, gl_TexCoord[0]+vec2(npw,-nph)).rgb;
      gi+=  giFF(ddiff3,n,-npw,nph)*texture2D(gdiffuse, gl_TexCoord[0]+vec2(-npw,nph)).rgb;
      gi+=  giFF(ddiff4,n,-npw,-nph)*texture2D(gdiffuse, gl_TexCoord[0]+vec2(-npw,-nph)).rgb;
      gi+=  giFF(ddiff5,n,0,nph)*texture2D(gdiffuse, gl_TexCoord[0]+vec2(0,nph)).rgb;
      gi+=  giFF(ddiff6,n,0,-nph)*texture2D(gdiffuse, gl_TexCoord[0]+vec2(0,-nph)).rgb;
      gi+=  giFF(ddiff7,n,npw,0)*texture2D(gdiffuse, gl_TexCoord[0]+vec2(npw,0)).rgb;
      gi+=  giFF(ddiff8,n,-npw,0)*texture2D(gdiffuse, gl_TexCoord[0]+vec2(-npw,0)).rgb;

      //increase sampling area:
      pw += incx;  
      ph += incy;    
   } 
   ao/=24.0;
   gi/=24.0;


   gl_FragColor = vec4(col-vec3(ao)+gi*5.0,1.0);
}

 

 

 

Have fun, or not....

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