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/*
* Copyright 2019 Patrick Stotko
* 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.
*/
#include <limits> // std::numeric_limits
#include <stdgpu/memory.h> // createDeviceArray, destroyDeviceArray, createHostArray, destroyHostArray
#include <stdgpu/platform.h> // STDGPU_HOST_DEVICE
class Image
{
public:
Image() = default;
static Image
createDeviceObject(const stdgpu::index_t width, const stdgpu::index_t height)
{
Image result;
result._values = createDeviceArray<std::uint8_t>(static_cast<stdgpu::index64_t>(width) *
static_cast<stdgpu::index64_t>(height));
result._width = width;
result._height = height;
return result;
}
static void
destroyDeviceObject(Image& device_object)
{
destroyDeviceArray<std::uint8_t>(device_object._values);
device_object._width = 0;
device_object._height = 0;
}
static Image
createHostObject(const stdgpu::index_t width, const stdgpu::index_t height)
{
Image result;
result._values = createHostArray<std::uint8_t>(static_cast<stdgpu::index64_t>(width) *
static_cast<stdgpu::index64_t>(height));
result._width = width;
result._height = height;
return result;
}
static void
destroyHostObject(Image& host_object)
{
destroyHostArray<std::uint8_t>(host_object._values);
host_object._width = 0;
host_object._height = 0;
}
// Further (static) member functions ...
STDGPU_HOST_DEVICE std::uint8_t&
operator()(const stdgpu::index_t x, const stdgpu::index_t y)
{
return _values[y * _width + x];
}
STDGPU_HOST_DEVICE stdgpu::index_t
width() const
{
return _width;
}
STDGPU_HOST_DEVICE stdgpu::index_t
height() const
{
return _height;
}
private:
std::uint8_t* _values = nullptr;
stdgpu::index_t _width = 0;
stdgpu::index_t _height = 0;
};
void
fill_image(Image image)
{
const stdgpu::index_t value_bound = static_cast<stdgpu::index_t>(std::numeric_limits<std::uint8_t>::max()) + 1;
for (stdgpu::index_t i = 0; i < image.width(); ++i)
{
for (stdgpu::index_t j = 0; j < image.height(); ++j)
{
std::uint8_t value = static_cast<std::uint8_t>((i * i + j * j) % value_bound);
image(i, j) = value;
}
}
}
int
main()
{
const stdgpu::index_t width = 1920;
const stdgpu::index_t height = 1080;
Image image = Image::createHostObject(width, height);
fill_image(image);
Image::destroyHostObject(image);
}
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