www.pudn.com > 3dwind2.0.rar > Ambient_ps.glsl

/******************************************************************************  
Copyright (c) W.J. van der Laan  
  
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/** Deferred shading framework  
	// W.J. :wumpus: van der Laan 2005 //  
	  
	Post shader: Multipass, ambient (base) pass  
*/  
uniform sampler2D tex0;  
uniform sampler2D tex1;  
  
varying vec2 texCoord;  
varying vec3 projCoord;  
  
uniform mat4 proj;  
  
uniform vec3 ambientColor;  
  
void main()  
{  
	vec4 a0 = texture2D(tex0, texCoord); // Attribute 0: Diffuse color+shininess  
    vec4 a1 = texture2D(tex1, texCoord); // Attribute 1: Normal+depth  
      
    // Clip fragment if depth is too far, so the skybox can be rendered on the background  
    if(a1.w==0.0)  
		discard;  
        
    // Attributes  
    vec3 colour = a0.rgb;  
    float alpha = a0.a;		// Specularity  
    float distance = a1.w;  // Distance from viewer -- is zero if no lighting wanted  
      
	// Calculate ambient colour of fragment  
    gl_FragColor = vec4( ambientColor*colour ,0);  
      
    // Calculate depth of fragment; GL requires a 2.0* here as the range is [-1, 1]  
    // Also, see again how matrix is transposed ([3][2] instead of [2][3])  
    gl_FragDepth = projCoord.z*proj[2][2] + proj[3][2]/(2.0*distance);  
}