I am having difficulty. I am using a float* to handle output from a compute shader. When I try to replace that float* with a Mat of type CV_32FC4, I get random noise. It has to be something simple, but I can’t seem to figure it out.
Here is the code BEFORE the conversion:
Here is the code AFTER the conversion:
The relevant code is in main.h and main.cpp. If I haven’t provided enough details, then please correct me.
Here is the code that (sort of) works. Note that I use a vector instead of a Mat.
int num_tiles_per_dimension = 1;
std::vector<cv::Mat> array_of_input_mats = splitImage(input_mat, num_tiles_per_dimension, num_tiles_per_dimension);
std::vector<cv::Mat> array_of_output_mats;
for (size_t i = 0; i < array_of_input_mats.size(); i++)
{
string s = "_input_" + to_string(i) + ".png";
imwrite(s.c_str(), array_of_input_mats[i]);
vector<float> output_pixels(4 * array_of_input_mats[i].rows * array_of_input_mats[i].cols);
//Mat output_pixels(array_of_input_mats[i].rows, array_of_input_mats[i].cols, CV_32FC4);
gpu_compute(
compute_shader_program,
reinterpret_cast<unsigned char*>(output_pixels.data()),
array_of_input_mats[i],
input_light_mat_with_dynamic_lights,
input_light_blocking_mat);
Mat uc_output_small(array_of_input_mats[i].rows, array_of_input_mats[i].cols, CV_8UC4);
for (size_t x = 0; x < (4 * uc_output_small.rows * uc_output_small.cols); x += 4)
{
uc_output_small.data[x + 0] = static_cast<unsigned char>(output_pixels[x + 0] * 255.0);
uc_output_small.data[x + 1] = static_cast<unsigned char>(output_pixels[x + 1] * 255.0);
uc_output_small.data[x + 2] = static_cast<unsigned char>(output_pixels[x + 2] * 255.0);
uc_output_small.data[x + 3] = 255;
}
array_of_output_mats.push_back(uc_output_small);
// These images show that something's not working right where num_tiles_per_dimension is >= 2
// there are duplicate output images
s = "_output_" + to_string(i) + ".png";
imwrite(s.c_str(), array_of_output_mats[i]);
}
Here is the Mat code, which returns noise:
int num_tiles_per_dimension = 1;
std::vector<cv::Mat> array_of_input_mats = splitImage(input_mat, num_tiles_per_dimension, num_tiles_per_dimension);
std::vector<cv::Mat> array_of_output_mats;
for (size_t i = 0; i < array_of_input_mats.size(); i++)
{
string s = "_input_" + to_string(i) + ".png";
imwrite(s.c_str(), array_of_input_mats[i]);
//vector<float> output_pixels(4 * array_of_input_mats[i].rows * array_of_input_mats[i].cols);
Mat output_pixels(array_of_input_mats[i].rows, array_of_input_mats[i].cols, CV_32FC4);
gpu_compute(
compute_shader_program,
reinterpret_cast<unsigned char*>(output_pixels.data),
array_of_input_mats[i],
input_light_mat_with_dynamic_lights,
input_light_blocking_mat);
Mat uc_output_small(array_of_input_mats[i].rows, array_of_input_mats[i].cols, CV_8UC4);
for (size_t x = 0; x < (4 * uc_output_small.rows * uc_output_small.cols); x += 4)
{
uc_output_small.data[x + 0] = static_cast<unsigned char>(output_pixels.data[x + 0] * 255.0);
uc_output_small.data[x + 1] = static_cast<unsigned char>(output_pixels.data[x + 1] * 255.0);
uc_output_small.data[x + 2] = static_cast<unsigned char>(output_pixels.data[x + 2] * 255.0);
uc_output_small.data[x + 3] = 255;
}
array_of_output_mats.push_back(uc_output_small);
// These images show that something's not working right where num_tiles_per_dimension is >= 2
// there are duplicate output images
s = "_output_" + to_string(i) + ".png";
imwrite(s.c_str(), array_of_output_mats[i]);
}
