Hi,

I’ve been busting away at this for a few days now, as anyone with a gamedev.net account can tell you. I am working on a deferred render, and have the first past done. Now I am working on the lighting pass but have came up with some strange errors. Not only does the light move and rotate with me (its suposted to be a fixed location point light) but there is a black spot in the center of the screen. Can someone please help me?

in main

void init(){

…

GLfloat pos[] = { 0.0, 1.0, 0.0, 1.0 };

GLfloat dif[] = { 0.0, 1.0, 1.0, 1.0 };

glLightfv( GL_LIGHT0, GL_POSITION, pos );

glLightfv( GL_LIGHT0, GL_DIFFUSE, dif );

}

…

//start the second pass

glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );

glLoadIdentity();

glLightfv( GL_LIGHT0, GL_POSITION, pos );

and the light shaders

vert

varying vec2 TexCoord;

void main(){

gl_Position = ftransform();

TexCoord = gl_MultiTexCoord0.st;

}

and frag, its kinda rought, need to clean it up after

uniform sampler2D colorMap;

uniform sampler2D normalMap;

varying vec2 TexCoord;

const vec2 camerarange = vec2( 1.0, 1000.0 );

const vec3 screensize = vec3( 640.0, 480.0, 640.0 / 480.0);

float DepthToZPosition(in float depth) {

return camerarange.x / (camerarange.y - depth * (camerarange.y - camerarange.x)) * camerarange.y;

}

void main(){

vec3 n = texture2D( normalMap, TexCoord).xyz ;

vec3 color = texture2D( colorMap, TexCoord ).rgb;

float depth = texture2D( normalMap, TexCoord).w;

`vec3 FragPosition = vec3( (((gl_FragCoord.x / screensize.x) - 0.5 ) * 2.0), (((-gl_FragCoord.y / screensize.y) + 0.5 ) * (2.0 / screensize.z)), DepthToZPosition( depth) ); FragPosition.xy *= FragPosition.z;`

`vec3 lightDir = normalize( gl_LightSource[0].position.xyz - FragPosition ); vec3 dir = lightDir; float dist = length( gl_LightSource[0].position.xyz - FragPosition ); vec3 pos = FragPosition;//vec3( 0.0, 1.0, 0.0 );`

`float nDotL = dot(n,dir); vec3 hv = normalize( dir + normalize( FragPosition ) );`

`if( nDotL > 0.0 ){ float att = 1.0 / ( gl_LightSource[0].constantAttenuation + gl_LightSource[0].linearAttenuation * dist + gl_LightSource[0].quadraticAttenuation * dist * dist); color.xyz += att * ( gl_LightSource[0].diffuse.rgb * nDotL + gl_LightSource[0].ambient.rgb ); float nDotHV = max(dot(n, hv), 0.0 ); color += att * 0.4 * gl_LightSource[0].specular.rgb * pow( nDotHV, 1.0 ); //0.4 = spec power, 1.0 = shineyness }`

`//color = FragPosition; gl_FragColor = vec4( color, 1.0 );`

}

and here is the first pass if anyone needs it

vert

varying vec3 Normal;

varying vec2 TexCoord; //gl_TexCoord is deprecated in 1.3 =/

varying vec2 Position;

void main(){

TexCoord = gl_MultiTexCoord0.st; //but so is MultiTexCoord… find a replacement

gl_Position = ftransform();

`Normal = gl_NormalMatrix * gl_Normal; Position = (gl_ModelViewMatrix * gl_Vertex).xy;`

}

and frag

uniform sampler2D TextureMap;

uniform float farReciprocal; //the far plain Reciprocal, IE 1/far ( multi is faster then division )

//NOTE: varying is deprecated in 1.3

//change to in for frag and out for vert

varying vec3 Normal;

varying vec2 TexCoord; //Becouse gl_TexCoord is depercated…

varying vec2 Position;

void main(){

//normal is not normalized, so we make the normal normal

vec3 n = normalize( Normal );

`float z = ( gl_FragCoord.z / gl_FragCoord.w ) * farReciprocal;`

`gl_FragData[0] = texture2D( TextureMap, TexCoord ); gl_FragData[1] = vec4( n, z );`

}