4d00e95ee3
Textures in 16 bit integer format are sometimes used for displacement, bump and normal maps and can be exported by tools like Substance Painter. Without this patch, Cycles would promote those textures to single precision floating point, causing them to take up twice as much memory as needed. Reviewers: #cycles, brecht, sergey Reviewed By: #cycles, brecht, sergey Subscribers: sergey, dingto, #cycles Tags: #cycles Differential Revision: https://developer.blender.org/D3523
238 lines
7.3 KiB
C++
238 lines
7.3 KiB
C++
/*
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* Copyright 2011-2016 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __UTIL_IMAGE_IMPL_H__
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#define __UTIL_IMAGE_IMPL_H__
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#include "util/util_algorithm.h"
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#include "util/util_half.h"
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#include "util/util_image.h"
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CCL_NAMESPACE_BEGIN
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namespace {
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template<typename T>
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const T *util_image_read(const vector<T>& pixels,
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const size_t width,
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const size_t height,
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const size_t /*depth*/,
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const size_t components,
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const size_t x, const size_t y, const size_t z) {
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const size_t index = ((size_t)z * (width * height) +
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(size_t)y * width +
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(size_t)x) * components;
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return &pixels[index];
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}
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/* Cast input pixel from unknown storage to float. */
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template<typename T>
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inline float cast_to_float(T value);
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template<>
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inline float cast_to_float(float value)
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{
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return value;
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}
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template<>
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inline float cast_to_float(uchar value)
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{
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return (float)value / 255.0f;
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}
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template<>
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inline float cast_to_float(uint16_t value)
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{
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return (float)value / 65535.0f;
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}
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template<>
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inline float cast_to_float(half value)
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{
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return half_to_float(value);
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}
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/* Cast float value to output pixel type. */
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template<typename T>
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inline T cast_from_float(float value);
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template<>
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inline float cast_from_float(float value)
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{
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return value;
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}
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template<>
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inline uchar cast_from_float(float value)
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{
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if(value < 0.0f) {
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return 0;
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}
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else if(value > (1.0f - 0.5f / 255.0f)) {
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return 255;
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}
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return (uchar)((255.0f * value) + 0.5f);
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}
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template<>
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inline uint16_t cast_from_float(float value)
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{
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if(value < 0.0f) {
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return 0;
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}
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else if(value >(1.0f - 0.5f / 65535.0f)) {
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return 65535;
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}
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return (uchar)((65535.0f * value) + 0.5f);
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}
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template<>
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inline half cast_from_float(float value)
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{
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return float_to_half(value);
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}
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template<typename T>
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void util_image_downscale_sample(const vector<T>& pixels,
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const size_t width,
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const size_t height,
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const size_t depth,
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const size_t components,
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const size_t kernel_size,
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const float x,
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const float y,
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const float z,
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T *result)
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{
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assert(components <= 4);
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const size_t ix = (size_t)x,
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iy = (size_t)y,
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iz = (size_t)z;
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/* TODO(sergey): Support something smarter than box filer. */
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float accum[4] = {0};
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size_t count = 0;
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for(size_t dz = 0; dz < kernel_size; ++dz) {
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for(size_t dy = 0; dy < kernel_size; ++dy) {
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for(size_t dx = 0; dx < kernel_size; ++dx) {
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const size_t nx = ix + dx,
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ny = iy + dy,
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nz = iz + dz;
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if(nx >= width || ny >= height || nz >= depth) {
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continue;
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}
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const T *pixel = util_image_read(pixels,
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width, height, depth,
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components,
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nx, ny, nz);
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for(size_t k = 0; k < components; ++k) {
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accum[k] += cast_to_float(pixel[k]);
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}
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++count;
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}
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}
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}
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if(count != 0) {
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const float inv_count = 1.0f / (float)count;
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for(size_t k = 0; k < components; ++k) {
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result[k] = cast_from_float<T>(accum[k] * inv_count);
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}
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}
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else {
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for(size_t k = 0; k < components; ++k) {
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result[k] = T(0.0f);
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}
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}
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}
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template<typename T>
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void util_image_downscale_pixels(const vector<T>& input_pixels,
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const size_t input_width,
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const size_t input_height,
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const size_t input_depth,
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const size_t components,
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const float inv_scale_factor,
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const size_t output_width,
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const size_t output_height,
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const size_t output_depth,
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vector<T> *output_pixels)
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{
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const size_t kernel_size = (size_t)(inv_scale_factor + 0.5f);
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for(size_t z = 0; z < output_depth; ++z) {
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for(size_t y = 0; y < output_height; ++y) {
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for(size_t x = 0; x < output_width; ++x) {
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const float input_x = (float)x * inv_scale_factor,
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input_y = (float)y * inv_scale_factor,
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input_z = (float)z * inv_scale_factor;
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const size_t output_index =
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(z * output_width * output_height +
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y * output_width + x) * components;
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util_image_downscale_sample(input_pixels,
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input_width, input_height, input_depth,
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components,
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kernel_size,
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input_x, input_y, input_z,
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&output_pixels->at(output_index));
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}
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}
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}
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}
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} /* namespace */
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template<typename T>
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void util_image_resize_pixels(const vector<T>& input_pixels,
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const size_t input_width,
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const size_t input_height,
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const size_t input_depth,
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const size_t components,
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const float scale_factor,
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vector<T> *output_pixels,
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size_t *output_width,
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size_t *output_height,
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size_t *output_depth)
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{
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/* Early output for case when no scaling is applied. */
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if(scale_factor == 1.0f) {
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*output_width = input_width;
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*output_height = input_height;
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*output_depth = input_depth;
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*output_pixels = input_pixels;
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return;
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}
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/* First of all, we calculate output image dimensions.
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* We clamp them to be 1 pixel at least so we do not generate degenerate
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* image.
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*/
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*output_width = max((size_t)((float)input_width * scale_factor), (size_t)1);
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*output_height = max((size_t)((float)input_height * scale_factor), (size_t)1);
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*output_depth = max((size_t)((float)input_depth * scale_factor), (size_t)1);
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/* Prepare pixel storage for the result. */
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const size_t num_output_pixels = ((*output_width) *
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(*output_height) *
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(*output_depth)) * components;
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output_pixels->resize(num_output_pixels);
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if(scale_factor < 1.0f) {
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const float inv_scale_factor = 1.0f / scale_factor;
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util_image_downscale_pixels(input_pixels,
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input_width, input_height, input_depth,
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components,
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inv_scale_factor,
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*output_width, *output_height, *output_depth,
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output_pixels);
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} else {
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/* TODO(sergey): Needs implementation. */
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}
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}
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CCL_NAMESPACE_END
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#endif /* __UTIL_IMAGE_IMPL_H__ */
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