58 lines
4.3 KiB
C++
58 lines
4.3 KiB
C++
char volume_accumulateSamples_lit_frag[] = "#version 110\n"
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"\n"
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"uniform sampler3D volumeTexture;\n"
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"uniform float AlphaFuncValue;\n"
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"\n"
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"varying vec3 lightDirection;\n"
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"\n"
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"vec4 accumulateSamples(vec4 fragColor, vec3 ts, vec3 te, vec3 dt, float scale, float cutoff, int num_iterations)\n"
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"{\n"
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" vec3 texcoord = te.xyz;\n"
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"\n"
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" float normalSampleDistance = length(dt);\n"
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" vec3 deltaX = vec3(normalSampleDistance, 0.0, 0.0);\n"
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" vec3 deltaY = vec3(0.0, normalSampleDistance, 0.0);\n"
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" vec3 deltaZ = vec3(0.0, 0.0, normalSampleDistance);\n"
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"\n"
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" while(num_iterations>0 && fragColor.a<cutoff)\n"
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" {\n"
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" vec4 color = texture3D( volumeTexture, texcoord);\n"
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"\n"
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" if (color.a>AlphaFuncValue)\n"
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" {\n"
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"\n"
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" float px = texture3D( volumeTexture, texcoord + deltaX).a;\n"
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" float py = texture3D( volumeTexture, texcoord + deltaY).a;\n"
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" float pz = texture3D( volumeTexture, texcoord + deltaZ).a;\n"
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"\n"
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" float nx = texture3D( volumeTexture, texcoord - deltaX).a;\n"
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" float ny = texture3D( volumeTexture, texcoord - deltaY).a;\n"
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" float nz = texture3D( volumeTexture, texcoord - deltaZ).a;\n"
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"\n"
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" vec3 grad = vec3(px-nx, py-ny, pz-nz);\n"
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" if (grad.x!=0.0 || grad.y!=0.0 || grad.z!=0.0)\n"
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" {\n"
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" vec3 normal = normalize(grad);\n"
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" float lightScale = 0.1 + max(0.0, dot(normal.xyz, lightDirection))*0.9;\n"
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"\n"
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" color.r *= lightScale;\n"
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" color.g *= lightScale;\n"
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" color.b *= lightScale;\n"
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" }\n"
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"\n"
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" float r = color.a * ((1.0-fragColor.a)*scale);\n"
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" fragColor.rgb += color.rgb*r;\n"
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" fragColor.a += r;\n"
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" }\n"
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"\n"
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" texcoord += dt;\n"
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"\n"
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" --num_iterations;\n"
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" }\n"
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"\n"
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" if (num_iterations>0) fragColor.a = 1.0;\n"
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"\n"
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" return fragColor;\n"
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"}\n"
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"\n";
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