kannonier8/blender
1
0
Fork 0
forked from bartvdbraak/blender
Code Pull Requests Activity
9396e11180
blender/intern/cycles/kernel/geom/geom_subd_triangle.h
Mai Lavelle 0b68c68006 Cycles microdisplacement: Support for Catmull-Clark subdivision via OpenSubdiv 
Enables Catmull-Clark subdivision meshes with support for creases and attribute
subdivision. Still waiting on OpenSubdiv to fully support face varying
interpolation for subdividing uv coordinates tho. Also there may be some
inconsistencies with Blender's subdivision which will be resolved at a
later time.

Code for reading patch tables and creating patch maps is borrowed
from OpenSubdiv.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D2111
2016-08-07 11:13:11 -04:00

350 lines
11 KiB
C
Raw Blame History

/*
* Copyright 2011-2016 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* Functions for retrieving attributes on triangles produced from subdivision meshes */
CCL_NAMESPACE_BEGIN
/* Patch index for triangle, -1 if not subdivision triangle */
ccl_device_inline uint subd_triangle_patch(KernelGlobals *kg, const ShaderData *sd)
{
return (ccl_fetch(sd, prim) != PRIM_NONE) ? kernel_tex_fetch(__tri_patch, ccl_fetch(sd, prim)) : ~0;
}
/* UV coords of triangle within patch */
ccl_device_inline void subd_triangle_patch_uv(KernelGlobals *kg, const ShaderData *sd, float2 uv[3])
{
uint4 tri_vindex = kernel_tex_fetch(__tri_vindex, ccl_fetch(sd, prim));
uv[0] = kernel_tex_fetch(__tri_patch_uv, tri_vindex.x);
uv[1] = kernel_tex_fetch(__tri_patch_uv, tri_vindex.y);
uv[2] = kernel_tex_fetch(__tri_patch_uv, tri_vindex.z);
}
/* Vertex indices of patch */
ccl_device_inline uint4 subd_triangle_patch_indices(KernelGlobals *kg, int patch)
{
uint4 indices;
indices.x = kernel_tex_fetch(__patches, patch+0);
indices.y = kernel_tex_fetch(__patches, patch+1);
indices.z = kernel_tex_fetch(__patches, patch+2);
indices.w = kernel_tex_fetch(__patches, patch+3);
return indices;
}
/* Originating face for patch */
ccl_device_inline uint subd_triangle_patch_face(KernelGlobals *kg, int patch)
{
return kernel_tex_fetch(__patches, patch+4);
}
/* Number of corners on originating face */
ccl_device_inline uint subd_triangle_patch_num_corners(KernelGlobals *kg, int patch)
{
return kernel_tex_fetch(__patches, patch+5) & 0xffff;
}
/* Indices of the four corners that are used by the patch */
ccl_device_inline void subd_triangle_patch_corners(KernelGlobals *kg, int patch, int corners[4])
{
uint4 data;
data.x = kernel_tex_fetch(__patches, patch+4);
data.y = kernel_tex_fetch(__patches, patch+5);
data.z = kernel_tex_fetch(__patches, patch+6);
data.w = kernel_tex_fetch(__patches, patch+7);
int num_corners = data.y & 0xffff;
if(num_corners == 4) {
/* quad */
corners[0] = data.z;
corners[1] = data.z+1;
corners[2] = data.z+2;
corners[3] = data.z+3;
}
else {
/* ngon */
int c = data.y >> 16;
corners[0] = data.z + c;
corners[1] = data.z + mod(c+1, num_corners);
corners[2] = data.w;
corners[3] = data.z + mod(c-1, num_corners);
}
}
/* Reading attributes on various subdivision triangle elements */
ccl_device_noinline float subd_triangle_attribute_float(KernelGlobals *kg, const ShaderData *sd, const AttributeDescriptor desc, float *dx, float *dy)
{
int patch = subd_triangle_patch(kg, sd);
if(desc.flags & ATTR_SUBDIVIDED) {
float2 uv[3];
subd_triangle_patch_uv(kg, sd, uv);
float2 dpdu = uv[0] - uv[2];
float2 dpdv = uv[1] - uv[2];
/* p is [s, t] */
float2 p = dpdu * ccl_fetch(sd, u) + dpdv * ccl_fetch(sd, v) + uv[2];
float a, dads, dadt;
a = patch_eval_float(kg, sd, desc.offset, patch, p.x, p.y, 0, &dads, &dadt);
#ifdef __RAY_DIFFERENTIALS__
if(dx || dy) {
float dsdu = dpdu.x;
float dtdu = dpdu.y;
float dsdv = dpdv.x;
float dtdv = dpdv.y;
if(dx) {
float dudx = ccl_fetch(sd, du).dx;
float dvdx = ccl_fetch(sd, dv).dx;
float dsdx = dsdu*dudx + dsdv*dvdx;
float dtdx = dtdu*dudx + dtdv*dvdx;
*dx = dads*dsdx + dadt*dtdx;
}
if(dy) {
float dudy = ccl_fetch(sd, du).dy;
float dvdy = ccl_fetch(sd, dv).dy;
float dsdy = dsdu*dudy + dsdv*dvdy;
float dtdy = dtdu*dudy + dtdv*dvdy;
*dy = dads*dsdy + dadt*dtdy;
}
}
#endif
return a;
}
else if(desc.element == ATTR_ELEMENT_FACE) {
if(dx) *dx = 0.0f;
if(dy) *dy = 0.0f;
return kernel_tex_fetch(__attributes_float, desc.offset + subd_triangle_patch_face(kg, patch));
}
else if(desc.element == ATTR_ELEMENT_VERTEX || desc.element == ATTR_ELEMENT_VERTEX_MOTION) {
float2 uv[3];
subd_triangle_patch_uv(kg, sd, uv);
uint4 v = subd_triangle_patch_indices(kg, patch);
float f0 = kernel_tex_fetch(__attributes_float, desc.offset + v.x);
float f1 = kernel_tex_fetch(__attributes_float, desc.offset + v.y);
float f2 = kernel_tex_fetch(__attributes_float, desc.offset + v.z);
float f3 = kernel_tex_fetch(__attributes_float, desc.offset + v.w);
if(subd_triangle_patch_num_corners(kg, patch) != 4) {
f1 = (f1+f0)*0.5f;
f3 = (f3+f0)*0.5f;
}
float a = mix(mix(f0, f1, uv[0].x), mix(f3, f2, uv[0].x), uv[0].y);
float b = mix(mix(f0, f1, uv[1].x), mix(f3, f2, uv[1].x), uv[1].y);
float c = mix(mix(f0, f1, uv[2].x), mix(f3, f2, uv[2].x), uv[2].y);
#ifdef __RAY_DIFFERENTIALS__
if(dx) *dx = ccl_fetch(sd, du).dx*a + ccl_fetch(sd, dv).dx*b - (ccl_fetch(sd, du).dx + ccl_fetch(sd, dv).dx)*c;
if(dy) *dy = ccl_fetch(sd, du).dy*a + ccl_fetch(sd, dv).dy*b - (ccl_fetch(sd, du).dy + ccl_fetch(sd, dv).dy)*c;
#endif
return ccl_fetch(sd, u)*a + ccl_fetch(sd, v)*b + (1.0f - ccl_fetch(sd, u) - ccl_fetch(sd, v))*c;
}
else if(desc.element == ATTR_ELEMENT_CORNER) {
float2 uv[3];
subd_triangle_patch_uv(kg, sd, uv);
int corners[4];
subd_triangle_patch_corners(kg, patch, corners);
float f0 = kernel_tex_fetch(__attributes_float, corners[0] + desc.offset);
float f1 = kernel_tex_fetch(__attributes_float, corners[1] + desc.offset);
float f2 = kernel_tex_fetch(__attributes_float, corners[2] + desc.offset);
float f3 = kernel_tex_fetch(__attributes_float, corners[3] + desc.offset);
if(subd_triangle_patch_num_corners(kg, patch) != 4) {
f1 = (f1+f0)*0.5f;
f3 = (f3+f0)*0.5f;
}
float a = mix(mix(f0, f1, uv[0].x), mix(f3, f2, uv[0].x), uv[0].y);
float b = mix(mix(f0, f1, uv[1].x), mix(f3, f2, uv[1].x), uv[1].y);
float c = mix(mix(f0, f1, uv[2].x), mix(f3, f2, uv[2].x), uv[2].y);
#ifdef __RAY_DIFFERENTIALS__
if(dx) *dx = ccl_fetch(sd, du).dx*a + ccl_fetch(sd, dv).dx*b - (ccl_fetch(sd, du).dx + ccl_fetch(sd, dv).dx)*c;
if(dy) *dy = ccl_fetch(sd, du).dy*a + ccl_fetch(sd, dv).dy*b - (ccl_fetch(sd, du).dy + ccl_fetch(sd, dv).dy)*c;
#endif
return ccl_fetch(sd, u)*a + ccl_fetch(sd, v)*b + (1.0f - ccl_fetch(sd, u) - ccl_fetch(sd, v))*c;
}
else {
if(dx) *dx = 0.0f;
if(dy) *dy = 0.0f;
return 0.0f;
}
}
ccl_device_noinline float3 subd_triangle_attribute_float3(KernelGlobals *kg, const ShaderData *sd, const AttributeDescriptor desc, float3 *dx, float3 *dy)
{
int patch = subd_triangle_patch(kg, sd);
if(desc.flags & ATTR_SUBDIVIDED) {
float2 uv[3];
subd_triangle_patch_uv(kg, sd, uv);
float2 dpdu = uv[0] - uv[2];
float2 dpdv = uv[1] - uv[2];
/* p is [s, t] */
float2 p = dpdu * ccl_fetch(sd, u) + dpdv * ccl_fetch(sd, v) + uv[2];
float3 a, dads, dadt;
if(desc.element == ATTR_ELEMENT_CORNER_BYTE) {
a = patch_eval_uchar4(kg, sd, desc.offset, patch, p.x, p.y, 0, &dads, &dadt);
}
else {
a = patch_eval_float3(kg, sd, desc.offset, patch, p.x, p.y, 0, &dads, &dadt);
}
#ifdef __RAY_DIFFERENTIALS__
if(dx || dy) {
float dsdu = dpdu.x;
float dtdu = dpdu.y;
float dsdv = dpdv.x;
float dtdv = dpdv.y;
if(dx) {
float dudx = ccl_fetch(sd, du).dx;
float dvdx = ccl_fetch(sd, dv).dx;
float dsdx = dsdu*dudx + dsdv*dvdx;
float dtdx = dtdu*dudx + dtdv*dvdx;
*dx = dads*dsdx + dadt*dtdx;
}
if(dy) {
float dudy = ccl_fetch(sd, du).dy;
float dvdy = ccl_fetch(sd, dv).dy;
float dsdy = dsdu*dudy + dsdv*dvdy;
float dtdy = dtdu*dudy + dtdv*dvdy;
*dy = dads*dsdy + dadt*dtdy;
}
}
#endif
return a;
}
else if(desc.element == ATTR_ELEMENT_FACE) {
if(dx) *dx = make_float3(0.0f, 0.0f, 0.0f);
if(dy) *dy = make_float3(0.0f, 0.0f, 0.0f);
return float4_to_float3(kernel_tex_fetch(__attributes_float3, desc.offset + subd_triangle_patch_face(kg, patch)));
}
else if(desc.element == ATTR_ELEMENT_VERTEX || desc.element == ATTR_ELEMENT_VERTEX_MOTION) {
float2 uv[3];
subd_triangle_patch_uv(kg, sd, uv);
uint4 v = subd_triangle_patch_indices(kg, patch);
float3 f0 = float4_to_float3(kernel_tex_fetch(__attributes_float3, desc.offset + v.x));
float3 f1 = float4_to_float3(kernel_tex_fetch(__attributes_float3, desc.offset + v.y));
float3 f2 = float4_to_float3(kernel_tex_fetch(__attributes_float3, desc.offset + v.z));
float3 f3 = float4_to_float3(kernel_tex_fetch(__attributes_float3, desc.offset + v.w));
if(subd_triangle_patch_num_corners(kg, patch) != 4) {
f1 = (f1+f0)*0.5f;
f3 = (f3+f0)*0.5f;
}
float3 a = mix(mix(f0, f1, uv[0].x), mix(f3, f2, uv[0].x), uv[0].y);
float3 b = mix(mix(f0, f1, uv[1].x), mix(f3, f2, uv[1].x), uv[1].y);
float3 c = mix(mix(f0, f1, uv[2].x), mix(f3, f2, uv[2].x), uv[2].y);
#ifdef __RAY_DIFFERENTIALS__
if(dx) *dx = ccl_fetch(sd, du).dx*a + ccl_fetch(sd, dv).dx*b - (ccl_fetch(sd, du).dx + ccl_fetch(sd, dv).dx)*c;
if(dy) *dy = ccl_fetch(sd, du).dy*a + ccl_fetch(sd, dv).dy*b - (ccl_fetch(sd, du).dy + ccl_fetch(sd, dv).dy)*c;
#endif
return ccl_fetch(sd, u)*a + ccl_fetch(sd, v)*b + (1.0f - ccl_fetch(sd, u) - ccl_fetch(sd, v))*c;
}
else if(desc.element == ATTR_ELEMENT_CORNER || desc.element == ATTR_ELEMENT_CORNER_BYTE) {
float2 uv[3];
subd_triangle_patch_uv(kg, sd, uv);
int corners[4];
subd_triangle_patch_corners(kg, patch, corners);
float3 f0, f1, f2, f3;
if(desc.element == ATTR_ELEMENT_CORNER) {
f0 = float4_to_float3(kernel_tex_fetch(__attributes_float3, corners[0] + desc.offset));
f1 = float4_to_float3(kernel_tex_fetch(__attributes_float3, corners[1] + desc.offset));
f2 = float4_to_float3(kernel_tex_fetch(__attributes_float3, corners[2] + desc.offset));
f3 = float4_to_float3(kernel_tex_fetch(__attributes_float3, corners[3] + desc.offset));
}
else {
f0 = color_byte_to_float(kernel_tex_fetch(__attributes_uchar4, corners[0] + desc.offset));
f1 = color_byte_to_float(kernel_tex_fetch(__attributes_uchar4, corners[1] + desc.offset));
f2 = color_byte_to_float(kernel_tex_fetch(__attributes_uchar4, corners[2] + desc.offset));
f3 = color_byte_to_float(kernel_tex_fetch(__attributes_uchar4, corners[3] + desc.offset));
}
if(subd_triangle_patch_num_corners(kg, patch) != 4) {
f1 = (f1+f0)*0.5f;
f3 = (f3+f0)*0.5f;
}
float3 a = mix(mix(f0, f1, uv[0].x), mix(f3, f2, uv[0].x), uv[0].y);
float3 b = mix(mix(f0, f1, uv[1].x), mix(f3, f2, uv[1].x), uv[1].y);
float3 c = mix(mix(f0, f1, uv[2].x), mix(f3, f2, uv[2].x), uv[2].y);
#ifdef __RAY_DIFFERENTIALS__
if(dx) *dx = ccl_fetch(sd, du).dx*a + ccl_fetch(sd, dv).dx*b - (ccl_fetch(sd, du).dx + ccl_fetch(sd, dv).dx)*c;
if(dy) *dy = ccl_fetch(sd, du).dy*a + ccl_fetch(sd, dv).dy*b - (ccl_fetch(sd, du).dy + ccl_fetch(sd, dv).dy)*c;
#endif
return ccl_fetch(sd, u)*a + ccl_fetch(sd, v)*b + (1.0f - ccl_fetch(sd, u) - ccl_fetch(sd, v))*c;
}
else {
if(dx) *dx = make_float3(0.0f, 0.0f, 0.0f);
if(dy) *dy = make_float3(0.0f, 0.0f, 0.0f);
return make_float3(0.0f, 0.0f, 0.0f);
}
}
CCL_NAMESPACE_END
View Git Blame Copy Permalink