86 lines
1.9 KiB
GLSL
86 lines
1.9 KiB
GLSL
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#version 120
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varying vec4 rawpos;
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varying vec4 ecPosition;
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varying vec3 VNormal;
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varying vec3 VTangent;
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varying vec3 VBinormal;
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varying vec3 Normal;
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varying vec4 constantColor;
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uniform sampler2D BaseTex;
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uniform sampler2D NormalTex;
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uniform float depth_factor;
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const float scale = 1.0;
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float ray_intersect(sampler2D reliefMap, vec2 dp, vec2 ds)
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{
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const int linear_search_steps = 10;
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float size = 1.0 / float(linear_search_steps);
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float depth = 0.0;
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float best_depth = 1.0;
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for(int i = 0; i < linear_search_steps - 1; ++i)
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{
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depth += size;
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float t = texture2D(reliefMap, dp + ds * depth).a;
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if(best_depth > 0.996)
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if(depth >= t)
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best_depth = depth;
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}
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depth = best_depth;
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const int binary_search_steps = 5;
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for(int i = 0; i < binary_search_steps; ++i)
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{
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size *= 0.5;
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float t = texture2D(reliefMap, dp + ds * depth).a;
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if(depth >= t)
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{
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best_depth = depth;
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depth -= 2.0 * size;
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}
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depth += size;
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}
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return(best_depth);
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}
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void main (void)
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{
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vec3 V = normalize(ecPosition.xyz);
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vec3 s = vec3(dot(V, VTangent), dot(V, VBinormal), dot(VNormal, V));
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vec2 ds = s.xy * depth_factor / s.z;
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vec2 dp = gl_TexCoord[0].st;
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float d = ray_intersect(NormalTex, dp, ds);
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vec2 uv = dp + ds * d;
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vec3 N = texture2D(NormalTex, uv).xyz * 2.0 - 1.0;
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float fogFactor;
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float fogCoord = ecPosition.z;
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const float LOG2 = 1.442695;
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fogFactor = exp2(-gl_Fog.density * gl_Fog.density * fogCoord * fogCoord * LOG2);
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fogFactor = clamp(fogFactor, 0.0, 1.0);
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vec4 c1 = texture2D(BaseTex, uv);
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N = normalize(N.x * VTangent + N.y * VBinormal + N.z * VNormal);
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vec3 l = gl_LightSource[0].position.xyz;
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vec3 diffuse = gl_Color.rgb * max(0.0, dot(N, l));
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vec4 ambient_light = constantColor + gl_LightSource[0].diffuse * vec4(diffuse, 1.0);
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c1 *= ambient_light;
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vec4 finalColor = c1;
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if(gl_Fog.density == 1.0)
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fogFactor=1.0;
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gl_FragColor = mix(gl_Fog.color ,finalColor, fogFactor);
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}
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