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Diffstat (limited to 'intern/cycles/kernel/geom/geom_patch.h')
-rw-r--r--intern/cycles/kernel/geom/geom_patch.h468
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diff --git a/intern/cycles/kernel/geom/geom_patch.h b/intern/cycles/kernel/geom/geom_patch.h
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--- a/intern/cycles/kernel/geom/geom_patch.h
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-/*
- * Based on code from OpenSubdiv released under this license:
- *
- * Copyright 2013 Pixar
- *
- * Licensed under the Apache License, Version 2.0 (the "Apache License")
- * with the following modification; you may not use this file except in
- * compliance with the Apache License and the following modification to it:
- * Section 6. Trademarks. is deleted and replaced with:
- *
- * 6. Trademarks. This License does not grant permission to use the trade
- * names, trademarks, service marks, or product names of the Licensor
- * and its affiliates, except as required to comply with Section 4(c) of
- * the License and to reproduce the content of the NOTICE file.
- *
- * You may obtain a copy of the Apache License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the Apache License with the above modification is
- * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied. See the Apache License for the specific
- * language governing permissions and limitations under the Apache License.
- */
-
-#pragma once
-
-CCL_NAMESPACE_BEGIN
-
-typedef struct PatchHandle {
- int array_index, patch_index, vert_index;
-} PatchHandle;
-
-ccl_device_inline int patch_map_resolve_quadrant(float median,
- ccl_private float *u,
- ccl_private float *v)
-{
- int quadrant = -1;
-
- if (*u < median) {
- if (*v < median) {
- quadrant = 0;
- }
- else {
- quadrant = 1;
- *v -= median;
- }
- }
- else {
- if (*v < median) {
- quadrant = 3;
- }
- else {
- quadrant = 2;
- *v -= median;
- }
- *u -= median;
- }
-
- return quadrant;
-}
-
-/* retrieve PatchHandle from patch coords */
-
-ccl_device_inline PatchHandle
-patch_map_find_patch(KernelGlobals kg, int object, int patch, float u, float v)
-{
- PatchHandle handle;
-
- kernel_assert((u >= 0.0f) && (u <= 1.0f) && (v >= 0.0f) && (v <= 1.0f));
-
- int node = (object_patch_map_offset(kg, object) + patch) / 2;
- float median = 0.5f;
-
- for (int depth = 0; depth < 0xff; depth++) {
- float delta = median * 0.5f;
-
- int quadrant = patch_map_resolve_quadrant(median, &u, &v);
- kernel_assert(quadrant >= 0);
-
- uint child = kernel_tex_fetch(__patches, node + quadrant);
-
- /* is the quadrant a hole? */
- if (!(child & PATCH_MAP_NODE_IS_SET)) {
- handle.array_index = -1;
- return handle;
- }
-
- uint index = child & PATCH_MAP_NODE_INDEX_MASK;
-
- if (child & PATCH_MAP_NODE_IS_LEAF) {
- handle.array_index = kernel_tex_fetch(__patches, index + 0);
- handle.patch_index = kernel_tex_fetch(__patches, index + 1);
- handle.vert_index = kernel_tex_fetch(__patches, index + 2);
-
- return handle;
- }
- else {
- node = index;
- }
-
- median = delta;
- }
-
- /* no leaf found */
- kernel_assert(0);
-
- handle.array_index = -1;
- return handle;
-}
-
-ccl_device_inline void patch_eval_bspline_weights(float t,
- ccl_private float *point,
- ccl_private float *deriv)
-{
- /* The four uniform cubic B-Spline basis functions evaluated at t */
- float inv_6 = 1.0f / 6.0f;
-
- float t2 = t * t;
- float t3 = t * t2;
-
- point[0] = inv_6 * (1.0f - 3.0f * (t - t2) - t3);
- point[1] = inv_6 * (4.0f - 6.0f * t2 + 3.0f * t3);
- point[2] = inv_6 * (1.0f + 3.0f * (t + t2 - t3));
- point[3] = inv_6 * t3;
-
- /* Derivatives of the above four basis functions at t */
- deriv[0] = -0.5f * t2 + t - 0.5f;
- deriv[1] = 1.5f * t2 - 2.0f * t;
- deriv[2] = -1.5f * t2 + t + 0.5f;
- deriv[3] = 0.5f * t2;
-}
-
-ccl_device_inline void patch_eval_adjust_boundary_weights(uint bits,
- ccl_private float *s,
- ccl_private float *t)
-{
- int boundary = ((bits >> 8) & 0xf);
-
- if (boundary & 1) {
- t[2] -= t[0];
- t[1] += 2 * t[0];
- t[0] = 0;
- }
-
- if (boundary & 2) {
- s[1] -= s[3];
- s[2] += 2 * s[3];
- s[3] = 0;
- }
-
- if (boundary & 4) {
- t[1] -= t[3];
- t[2] += 2 * t[3];
- t[3] = 0;
- }
-
- if (boundary & 8) {
- s[2] -= s[0];
- s[1] += 2 * s[0];
- s[0] = 0;
- }
-}
-
-ccl_device_inline int patch_eval_depth(uint patch_bits)
-{
- return (patch_bits & 0xf);
-}
-
-ccl_device_inline float patch_eval_param_fraction(uint patch_bits)
-{
- bool non_quad_root = (patch_bits >> 4) & 0x1;
- int depth = patch_eval_depth(patch_bits);
-
- if (non_quad_root) {
- return 1.0f / (float)(1 << (depth - 1));
- }
- else {
- return 1.0f / (float)(1 << depth);
- }
-}
-
-ccl_device_inline void patch_eval_normalize_coords(uint patch_bits,
- ccl_private float *u,
- ccl_private float *v)
-{
- float frac = patch_eval_param_fraction(patch_bits);
-
- int iu = (patch_bits >> 22) & 0x3ff;
- int iv = (patch_bits >> 12) & 0x3ff;
-
- /* top left corner */
- float pu = (float)iu * frac;
- float pv = (float)iv * frac;
-
- /* normalize uv coordinates */
- *u = (*u - pu) / frac;
- *v = (*v - pv) / frac;
-}
-
-/* retrieve patch control indices */
-
-ccl_device_inline int patch_eval_indices(KernelGlobals kg,
- ccl_private const PatchHandle *handle,
- int channel,
- int indices[PATCH_MAX_CONTROL_VERTS])
-{
- int index_base = kernel_tex_fetch(__patches, handle->array_index + 2) + handle->vert_index;
-
- /* XXX: regular patches only */
- for (int i = 0; i < 16; i++) {
- indices[i] = kernel_tex_fetch(__patches, index_base + i);
- }
-
- return 16;
-}
-
-/* evaluate patch basis functions */
-
-ccl_device_inline void patch_eval_basis(KernelGlobals kg,
- ccl_private const PatchHandle *handle,
- float u,
- float v,
- float weights[PATCH_MAX_CONTROL_VERTS],
- float weights_du[PATCH_MAX_CONTROL_VERTS],
- float weights_dv[PATCH_MAX_CONTROL_VERTS])
-{
- uint patch_bits = kernel_tex_fetch(__patches, handle->patch_index + 1); /* read patch param */
- float d_scale = 1 << patch_eval_depth(patch_bits);
-
- bool non_quad_root = (patch_bits >> 4) & 0x1;
- if (non_quad_root) {
- d_scale *= 0.5f;
- }
-
- patch_eval_normalize_coords(patch_bits, &u, &v);
-
- /* XXX: regular patches only for now. */
-
- float s[4], t[4], ds[4], dt[4];
-
- patch_eval_bspline_weights(u, s, ds);
- patch_eval_bspline_weights(v, t, dt);
-
- patch_eval_adjust_boundary_weights(patch_bits, s, t);
- patch_eval_adjust_boundary_weights(patch_bits, ds, dt);
-
- for (int k = 0; k < 4; k++) {
- for (int l = 0; l < 4; l++) {
- weights[4 * k + l] = s[l] * t[k];
- weights_du[4 * k + l] = ds[l] * t[k] * d_scale;
- weights_dv[4 * k + l] = s[l] * dt[k] * d_scale;
- }
- }
-}
-
-/* generic function for evaluating indices and weights from patch coords */
-
-ccl_device_inline int patch_eval_control_verts(KernelGlobals kg,
- int object,
- int patch,
- float u,
- float v,
- int channel,
- int indices[PATCH_MAX_CONTROL_VERTS],
- float weights[PATCH_MAX_CONTROL_VERTS],
- float weights_du[PATCH_MAX_CONTROL_VERTS],
- float weights_dv[PATCH_MAX_CONTROL_VERTS])
-{
- PatchHandle handle = patch_map_find_patch(kg, object, patch, u, v);
- kernel_assert(handle.array_index >= 0);
-
- int num_control = patch_eval_indices(kg, &handle, channel, indices);
- patch_eval_basis(kg, &handle, u, v, weights, weights_du, weights_dv);
-
- return num_control;
-}
-
-/* functions for evaluating attributes on patches */
-
-ccl_device float patch_eval_float(KernelGlobals kg,
- ccl_private const ShaderData *sd,
- int offset,
- int patch,
- float u,
- float v,
- int channel,
- ccl_private float *du,
- ccl_private float *dv)
-{
- int indices[PATCH_MAX_CONTROL_VERTS];
- float weights[PATCH_MAX_CONTROL_VERTS];
- float weights_du[PATCH_MAX_CONTROL_VERTS];
- float weights_dv[PATCH_MAX_CONTROL_VERTS];
-
- int num_control = patch_eval_control_verts(
- kg, sd->object, patch, u, v, channel, indices, weights, weights_du, weights_dv);
-
- float val = 0.0f;
- if (du)
- *du = 0.0f;
- if (dv)
- *dv = 0.0f;
-
- for (int i = 0; i < num_control; i++) {
- float v = kernel_tex_fetch(__attributes_float, offset + indices[i]);
-
- val += v * weights[i];
- if (du)
- *du += v * weights_du[i];
- if (dv)
- *dv += v * weights_dv[i];
- }
-
- return val;
-}
-
-ccl_device float2 patch_eval_float2(KernelGlobals kg,
- ccl_private const ShaderData *sd,
- int offset,
- int patch,
- float u,
- float v,
- int channel,
- ccl_private float2 *du,
- ccl_private float2 *dv)
-{
- int indices[PATCH_MAX_CONTROL_VERTS];
- float weights[PATCH_MAX_CONTROL_VERTS];
- float weights_du[PATCH_MAX_CONTROL_VERTS];
- float weights_dv[PATCH_MAX_CONTROL_VERTS];
-
- int num_control = patch_eval_control_verts(
- kg, sd->object, patch, u, v, channel, indices, weights, weights_du, weights_dv);
-
- float2 val = make_float2(0.0f, 0.0f);
- if (du)
- *du = make_float2(0.0f, 0.0f);
- if (dv)
- *dv = make_float2(0.0f, 0.0f);
-
- for (int i = 0; i < num_control; i++) {
- float2 v = kernel_tex_fetch(__attributes_float2, offset + indices[i]);
-
- val += v * weights[i];
- if (du)
- *du += v * weights_du[i];
- if (dv)
- *dv += v * weights_dv[i];
- }
-
- return val;
-}
-
-ccl_device float3 patch_eval_float3(KernelGlobals kg,
- ccl_private const ShaderData *sd,
- int offset,
- int patch,
- float u,
- float v,
- int channel,
- ccl_private float3 *du,
- ccl_private float3 *dv)
-{
- int indices[PATCH_MAX_CONTROL_VERTS];
- float weights[PATCH_MAX_CONTROL_VERTS];
- float weights_du[PATCH_MAX_CONTROL_VERTS];
- float weights_dv[PATCH_MAX_CONTROL_VERTS];
-
- int num_control = patch_eval_control_verts(
- kg, sd->object, patch, u, v, channel, indices, weights, weights_du, weights_dv);
-
- float3 val = make_float3(0.0f, 0.0f, 0.0f);
- if (du)
- *du = make_float3(0.0f, 0.0f, 0.0f);
- if (dv)
- *dv = make_float3(0.0f, 0.0f, 0.0f);
-
- for (int i = 0; i < num_control; i++) {
- float3 v = float4_to_float3(kernel_tex_fetch(__attributes_float3, offset + indices[i]));
-
- val += v * weights[i];
- if (du)
- *du += v * weights_du[i];
- if (dv)
- *dv += v * weights_dv[i];
- }
-
- return val;
-}
-
-ccl_device float4 patch_eval_float4(KernelGlobals kg,
- ccl_private const ShaderData *sd,
- int offset,
- int patch,
- float u,
- float v,
- int channel,
- ccl_private float4 *du,
- ccl_private float4 *dv)
-{
- int indices[PATCH_MAX_CONTROL_VERTS];
- float weights[PATCH_MAX_CONTROL_VERTS];
- float weights_du[PATCH_MAX_CONTROL_VERTS];
- float weights_dv[PATCH_MAX_CONTROL_VERTS];
-
- int num_control = patch_eval_control_verts(
- kg, sd->object, patch, u, v, channel, indices, weights, weights_du, weights_dv);
-
- float4 val = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
- if (du)
- *du = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
- if (dv)
- *dv = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
-
- for (int i = 0; i < num_control; i++) {
- float4 v = kernel_tex_fetch(__attributes_float3, offset + indices[i]);
-
- val += v * weights[i];
- if (du)
- *du += v * weights_du[i];
- if (dv)
- *dv += v * weights_dv[i];
- }
-
- return val;
-}
-
-ccl_device float4 patch_eval_uchar4(KernelGlobals kg,
- ccl_private const ShaderData *sd,
- int offset,
- int patch,
- float u,
- float v,
- int channel,
- ccl_private float4 *du,
- ccl_private float4 *dv)
-{
- int indices[PATCH_MAX_CONTROL_VERTS];
- float weights[PATCH_MAX_CONTROL_VERTS];
- float weights_du[PATCH_MAX_CONTROL_VERTS];
- float weights_dv[PATCH_MAX_CONTROL_VERTS];
-
- int num_control = patch_eval_control_verts(
- kg, sd->object, patch, u, v, channel, indices, weights, weights_du, weights_dv);
-
- float4 val = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
- if (du)
- *du = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
- if (dv)
- *dv = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
-
- for (int i = 0; i < num_control; i++) {
- float4 v = color_srgb_to_linear_v4(
- color_uchar4_to_float4(kernel_tex_fetch(__attributes_uchar4, offset + indices[i])));
-
- val += v * weights[i];
- if (du)
- *du += v * weights_du[i];
- if (dv)
- *dv += v * weights_dv[i];
- }
-
- return val;
-}
-
-CCL_NAMESPACE_END
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