Attachment 38500 Details for Bug 30030 – landmass fragment shader

landmass fragment shader

landmass.frag (text/plain), 3.39 KB, created by Magnus Kessler on 2010-09-06 23:29:57 UTC

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Creator: Magnus Kessler

Created: 2010-09-06 23:29:57 UTC

Size: 3.39 KB

patch

obsolete

>#version 120
>
>varying vec4  rawpos;
>varying vec4  ecPosition;
>varying vec3  VNormal;
>varying vec3  VTangent;
>varying vec3  VBinormal;
>varying vec3  Normal;
>varying vec4  constantColor;
>varying float bump;
>
>uniform sampler3D NoiseTex;
>uniform sampler2D BaseTex;
>uniform sampler2D NormalTex;
>uniform float depth_factor;
>uniform float quality_level; // From /sim/rendering/quality-level
>uniform float snowlevel; // From /sim/rendering/snow-level-m
>
>const float scale = 1.0;
>int linear_search_steps = 10;
>
>float ray_intersect(sampler2D reliefMap, vec2 dp, vec2 ds)
>{
>
>	float size = 1.0 / float(linear_search_steps);
>	float depth = 0.0;
>	float best_depth = 1.0;
>
>	for(int i = 0; i < linear_search_steps - 1; ++i)
>	{
>		depth += size;
>		float t = texture2D(reliefMap, dp + ds * depth).a;
>		if(best_depth > 0.996)
>			if(depth >= t)
>				best_depth = depth;
>	}
>	depth = best_depth;
>
>	const int binary_search_steps = 5;
>
>	for(int i = 0; i < binary_search_steps; ++i)
>	{
>		size *= 0.5;
>		float t = texture2D(reliefMap, dp + ds * depth).a;
>		if(depth >= t)
>		{
>			best_depth = depth;
>			depth -= 2.0 * size;
>		}
>		depth += size;
>	}
>
>	return(best_depth);
>}
>
>void main (void)
>{
>	if ( quality_level >= 3.5 ) {
>		linear_search_steps = 20;
>	}
>	vec2 uv, dp, ds;
>	vec3 N;
>	float d;
>	if ( bump > 0.9 && quality_level >= 2.0 )
>	{
>		vec3 V = normalize(ecPosition.xyz);
>		float a = dot(VNormal, -V);
>		vec2 s = vec2(dot(V, VTangent), dot(V, VBinormal));
>		s *= depth_factor / a;
>		ds = s;
>		dp = gl_TexCoord[0].st;
>		d = ray_intersect(NormalTex, dp, ds);
>
>		uv = dp + ds * d;
>		N = texture2D(NormalTex, uv).xyz * 2.0 - 1.0;
>	}
>	else
>	{
>		uv = gl_TexCoord[0].st;
>		N = vec3(0.0, 0.0, 1.0);
>	}
>
>	vec4 noisevec   = texture3D(NoiseTex, (rawpos.xyz)*0.01*scale);
>	vec4 nvL   = texture3D(NoiseTex, (rawpos.xyz)*0.00066*scale);
>
>	float fogFactor;
>	float fogCoord = ecPosition.z;
>	const float LOG2 = 1.442695;
>	fogFactor = exp2(-gl_Fog.density * gl_Fog.density * fogCoord * fogCoord * LOG2);
>	float biasFactor = fogFactor = clamp(fogFactor, 0.0, 1.0);
>
>	float n=0.06;
>	n += nvL[0]*0.4;
>	n += nvL[1]*0.6;
>	n += nvL[2]*2.0;
>	n += nvL[3]*4.0;
>	n += noisevec[0]*0.1;
>	n += noisevec[1]*0.4;
>
>	n += noisevec[2]*0.8;
>	n += noisevec[3]*2.1;
>	n = mix(0.6, n, biasFactor);
>	// good
>	vec4 c1 = texture2D(BaseTex, uv);
>	//brown
>	//c1 = mix(c1, vec4(n-0.46, n-0.45, n-0.53, 1.0), smoothstep(0.50, 0.55, nvL[2]*6.6));
>	//"steep = gray"
>	c1 = mix(vec4(n-0.30, n-0.29, n-0.37, 1.0), c1, smoothstep(0.970, 0.990, abs(normalize(Normal).z)+nvL[2]*1.3));
>	//"snow"
>	c1 = mix(c1, clamp(n+nvL[2]*4.1+vec4(0.1, 0.1, nvL[2]*2.2, 1.0), 0.7, 1.0), smoothstep(snowlevel+300.0, snowlevel+360.0, (rawpos.z)+nvL[1]*3000.0));
>
>	N = normalize(N.x * VTangent + N.y * VBinormal + N.z * VNormal);
>	vec3 l = gl_LightSource[0].position.xyz;
>	vec3 diffuse = gl_Color.rgb * max(0.0, dot(N, l));
>	float shadow_factor = 1.0;
>
>	// Shadow
>	if ( quality_level >= 3.0 ) {
>		dp += ds * d;
>		vec3 sl = normalize( vec3( dot( l, VTangent ), dot( l, VBinormal ), dot( -l, VNormal ) ) );
>		ds = sl.xy * depth_factor / sl.z;
>		dp -= ds * d;
>		float dl = ray_intersect(NormalTex, dp, ds);
>		if ( dl < d - 0.05 )
>			shadow_factor = dot( constantColor.xyz, vec3( 1.0, 1.0, 1.0 ) ) * 0.25;
>	}
>	// end shadow
>
>	vec4 ambient_light = constantColor + gl_LightSource[0].diffuse * shadow_factor * vec4(diffuse, 1.0);
>
>	c1 *= ambient_light;
>	vec4 finalColor = c1;
>
>	if(gl_Fog.density == 1.0)
>		fogFactor=1.0;
>
>	gl_FragColor = mix(gl_Fog.color ,finalColor, fogFactor);
>}

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Attachments on bug 30030: 38500 | 38501 | 38502 | 38503

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