6a88f83d67
Goal is to add the length attribute to the Hair Info node, for better control over color gradients or similar along the hair. Reviewed By: #eevee_viewport, brecht Differential Revision: https://developer.blender.org/D10481
98 lines
2.5 KiB
GLSL
98 lines
2.5 KiB
GLSL
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vec3 calc_barycentric_distances(vec3 pos0, vec3 pos1, vec3 pos2)
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{
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vec3 edge21 = pos2 - pos1;
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vec3 edge10 = pos1 - pos0;
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vec3 edge02 = pos0 - pos2;
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vec3 d21 = normalize(edge21);
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vec3 d10 = normalize(edge10);
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vec3 d02 = normalize(edge02);
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vec3 dists;
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float d = dot(d21, edge02);
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dists.x = sqrt(dot(edge02, edge02) - d * d);
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d = dot(d02, edge10);
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dists.y = sqrt(dot(edge10, edge10) - d * d);
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d = dot(d10, edge21);
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dists.z = sqrt(dot(edge21, edge21) - d * d);
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return dists;
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}
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vec2 calc_barycentric_co(int vertid)
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{
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vec2 bary;
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bary.x = float((vertid % 3) == 0);
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bary.y = float((vertid % 3) == 1);
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return bary;
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}
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#ifdef HAIR_SHADER
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/* Hairs uv and col attributes are passed by bufferTextures. */
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# define DEFINE_ATTR(type, attr) uniform samplerBuffer attr
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# define GET_ATTR(type, attr) hair_get_customdata_##type(attr)
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# define barycentric_get() hair_get_barycentric()
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# define barycentric_resolve(bary) hair_resolve_barycentric(bary)
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vec3 orco_get(vec3 local_pos, mat4 modelmatinv, vec4 orco_madd[2], const samplerBuffer orco_samp)
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{
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/* TODO: fix ORCO with modifiers. */
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vec3 orco = (modelmatinv * vec4(local_pos, 1.0)).xyz;
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return orco_madd[0].xyz + orco * orco_madd[1].xyz;
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}
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float hair_len_get(int id, const samplerBuffer len)
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{
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return texelFetch(len, id).x;
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}
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vec4 tangent_get(const samplerBuffer attr, mat3 normalmat)
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{
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/* Unsupported */
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return vec4(0.0);
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}
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#else /* MESH_SHADER */
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# define DEFINE_ATTR(type, attr) in type attr
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# define GET_ATTR(type, attr) attr
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/* Calculated in geom shader later with calc_barycentric_co. */
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# define barycentric_get() vec2(0)
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# define barycentric_resolve(bary) bary
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vec3 orco_get(vec3 local_pos, mat4 modelmatinv, vec4 orco_madd[2], vec4 orco)
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{
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/* If the object does not have any deformation, the orco layer calculation is done on the fly
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* using the orco_madd factors.
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* We know when there is no orco layer when orco.w is 1.0 because it uses the generic vertex
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* attrib (which is [0,0,0,1]). */
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if (orco.w == 0.0) {
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return orco.xyz * 0.5 + 0.5;
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}
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else {
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return orco_madd[0].xyz + local_pos * orco_madd[1].xyz;
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}
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}
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float hair_len_get(int id, const float len)
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{
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return len;
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}
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vec4 tangent_get(vec4 attr, mat3 normalmat)
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{
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vec4 tangent;
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tangent.xyz = normalmat * attr.xyz;
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tangent.w = attr.w;
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float len_sqr = dot(tangent.xyz, tangent.xyz);
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/* Normalize only if vector is not null. */
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if (len_sqr > 0.0) {
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tangent.xyz *= inversesqrt(len_sqr);
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}
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return tangent;
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}
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#endif
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