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WIP Attempt to fix resulting blue-noise

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This commit is contained in:
Stephen Seo 2021-11-10 18:12:04 +09:00
parent e90834dc0a
commit d44297d079
4 changed files with 45 additions and 17 deletions
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3
src/blue_noise.cl
View file

@ -22,10 +22,11 @@ __kernel void do_filter(
if(i < 0 || i >= width * height) {
return;
}
int x = i % width;
int y = i / width;
float sum = 0.0f;
float sum = 0.0F;
for(int q = 0; q < filter_size; ++q) {
int q_prime = height - filter_size / 2 + y + q;
for(int p = 0; p < filter_size; ++p) {

31
src/blue_noise.cpp
View file

@ -10,6 +10,8 @@
#include <CL/opencl.h>
#include "image.hpp"
#ifndef NDEBUG
# include <cstdio>
#endif
@ -245,7 +247,7 @@ std::vector<unsigned int> dither::internal::blue_noise_impl(int width, int heigh
}
std::vector<unsigned int> dither::internal::blue_noise_cl_impl(
int width, int height, int filter_size, cl_context context, cl_device_id device, cl_program program) {
const int width, const int height, const int filter_size, cl_context context, cl_device_id device, cl_program program) {
cl_int err;
cl_kernel kernel;
cl_command_queue queue;
@ -262,10 +264,10 @@ std::vector<unsigned int> dither::internal::blue_noise_cl_impl(
queue = clCreateCommandQueueWithProperties(context, device, nullptr, &err);
d_filter_out = clCreateBuffer(context, CL_MEM_WRITE_ONLY, count * sizeof(float), nullptr, nullptr);
d_precomputed = clCreateBuffer(context, CL_MEM_READ_ONLY, filter_size * filter_size * sizeof(float), nullptr, nullptr);
d_precomputed = clCreateBuffer(context, CL_MEM_READ_ONLY, precomputed.size() * sizeof(float), nullptr, nullptr);
d_pbp = clCreateBuffer(context, CL_MEM_READ_ONLY, count * sizeof(int), nullptr, nullptr);
err = clEnqueueWriteBuffer(queue, d_precomputed, CL_TRUE, 0, filter_size * filter_size * sizeof(float), &precomputed[0], 0, nullptr, nullptr);
err = clEnqueueWriteBuffer(queue, d_precomputed, CL_TRUE, 0, precomputed.size() * sizeof(float), &precomputed[0], 0, nullptr, nullptr);
if(err != CL_SUCCESS) {
std::cerr << "OpenCL: Failed to write to d_precomputed buffer\n";
clReleaseMemObject(d_pbp);
@ -356,6 +358,18 @@ std::vector<unsigned int> dither::internal::blue_noise_cl_impl(
clReleaseCommandQueue(queue);
return {};
}
if (filter_size % 2 == 0) {
int filter_size_odd = filter_size + 1;
if(clSetKernelArg(kernel, 5, sizeof(int), &filter_size_odd) != CL_SUCCESS) {
std::cerr << "OpenCL: Failed to set kernel arg 4\n";
clReleaseKernel(kernel);
clReleaseMemObject(d_pbp);
clReleaseMemObject(d_precomputed);
clReleaseMemObject(d_filter_out);
clReleaseCommandQueue(queue);
return {};
}
} else {
if(clSetKernelArg(kernel, 5, sizeof(int), &filter_size) != CL_SUCCESS) {
std::cerr << "OpenCL: Failed to set kernel arg 4\n";
clReleaseKernel(kernel);
@ -365,6 +379,7 @@ std::vector<unsigned int> dither::internal::blue_noise_cl_impl(
clReleaseCommandQueue(queue);
return {};
}
}
if(clGetKernelWorkGroupInfo(kernel, device, CL_KERNEL_WORK_GROUP_SIZE, sizeof(std::size_t), &local_size, nullptr) != CL_SUCCESS) {
std::cerr << "OpenCL: Failed to get work group size\n";
@ -502,6 +517,8 @@ std::vector<unsigned int> dither::internal::blue_noise_cl_impl(
}
if(iterations % 100 == 0) {
std::cout << "max was " << max << ", second_min is " << second_min
<< std::endl;
// generate blue_noise image from pbp
FILE *blue_noise_image = fopen("blue_noise.pbm", "w");
fprintf(blue_noise_image, "P1\n%d %d\n", width, height);
@ -539,7 +556,7 @@ std::vector<unsigned int> dither::internal::blue_noise_cl_impl(
std::cout << "Generating dither_array...\n";
std::unordered_set<unsigned int> set;
std::vector<unsigned int> dither_array(count);
std::vector<unsigned int> dither_array(count, 0);
int min, max;
{
std::vector<bool> pbp_copy(pbp);
@ -557,6 +574,10 @@ std::vector<unsigned int> dither::internal::blue_noise_cl_impl(
}
}
pbp = pbp_copy;
#ifndef NDEBUG
image::Bl min_pixels = internal::rangeToBl(dither_array, width);
min_pixels.writeToFile(image::file_type::PNG, true, "da_min_pixels.png");
#endif
}
std::cout << "\nRanking remainder of first half of pixels...\n";
for (unsigned int i = pixel_count; i < (unsigned int)((count + 1) / 2); ++i) {
@ -573,6 +594,8 @@ std::vector<unsigned int> dither::internal::blue_noise_cl_impl(
}
#ifndef NDEBUG
{
image::Bl min_pixels = internal::rangeToBl(dither_array, width);
min_pixels.writeToFile(image::file_type::PNG, true, "da_mid_pixels.png");
get_filter();
internal::write_filter(filter, width, "filter_mid.pgm");
image::Bl pbp_image = toBl(pbp, width);

10
src/blue_noise.hpp
View file

@ -30,7 +30,7 @@ image::Bl blue_noise(int width, int height, int threads = 1, bool use_opencl = t
namespace internal {
std::vector<unsigned int> blue_noise_impl(int width, int height, int threads = 1);
std::vector<unsigned int> blue_noise_cl_impl(
int width, int height, int filter_size,
const int width, const int height, const int filter_size,
cl_context context, cl_device_id device, cl_program program);
inline std::vector<bool> random_noise(int size, int subsize) {
@ -69,13 +69,16 @@ namespace internal {
inline std::vector<float> precompute_gaussian(int size) {
std::vector<float> precomputed;
if (size % 2 == 0) {
++size;
}
precomputed.reserve(size * size);
for(int i = 0; i < size * size; ++i) {
auto xy = utility::oneToTwo(i, size);
precomputed.push_back(gaussian(
(float)xy.first - (float)size / 2.0F + 0.5F,
(float)xy.second - (float)size / 2.0F + 0.5F));
xy.first - (size / 2),
xy.second - (size / 2)));
}
return precomputed;
@ -230,6 +233,7 @@ namespace internal {
}
}
if (count * 2 >= pbp.size()) {
//std::cout << "MINMAX flip\n"; // DEBUG
for (unsigned int i = 0; i < pbp.size(); ++i) {
pbp[i] = !pbp[i];
}

2
src/main.cpp
View file

@ -5,7 +5,7 @@
int main(int argc, char **argv) {
//#ifndef NDEBUG
std::cout << "Trying blue_noise..." << std::endl;
image::Bl bl = dither::blue_noise(32, 32, 15, true);
image::Bl bl = dither::blue_noise(64, 64, 15, true);
bl.writeToFile(image::file_type::PNG, true, "blueNoiseOut.png");
//#endif