67 lines
1.8 KiB
C++
67 lines
1.8 KiB
C++
/* Copyright (c) 2019-2024, Sascha Willems
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* 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 "heightmap.h"
|
|
|
|
#include <cstring>
|
|
|
|
#include "common/error.h"
|
|
|
|
#include "common/glm_common.h"
|
|
|
|
#include "filesystem/legacy.h"
|
|
|
|
namespace vkb
|
|
{
|
|
HeightMap::HeightMap(const std::string &file_name, const uint32_t patchsize)
|
|
{
|
|
std::string file_path = fs::path::get(fs::path::Assets, file_name);
|
|
|
|
ktxTexture *ktx_texture;
|
|
ktxResult ktx_result;
|
|
ktx_result = ktxTexture_CreateFromNamedFile(file_path.c_str(), KTX_TEXTURE_CREATE_LOAD_IMAGE_DATA_BIT, &ktx_texture);
|
|
|
|
assert(ktx_result == KTX_SUCCESS);
|
|
|
|
ktx_size_t ktx_size = ktxTexture_GetImageSize(ktx_texture, 0);
|
|
ktx_uint8_t *ktx_image = ktxTexture_GetData(ktx_texture);
|
|
|
|
dim = ktx_texture->baseWidth;
|
|
data = new uint16_t[dim * dim];
|
|
|
|
memcpy(data, ktx_image, ktx_size);
|
|
|
|
this->scale = dim / patchsize;
|
|
|
|
ktxTexture_Destroy(ktx_texture);
|
|
}
|
|
|
|
HeightMap::~HeightMap()
|
|
{
|
|
delete[] data;
|
|
}
|
|
|
|
float HeightMap::get_height(const uint32_t x, const uint32_t y)
|
|
{
|
|
glm::ivec2 rpos = glm::ivec2(x, y) * glm::ivec2(scale);
|
|
rpos.x = std::max(0, std::min(rpos.x, static_cast<int>(dim) - 1));
|
|
rpos.y = std::max(0, std::min(rpos.y, static_cast<int>(dim) - 1));
|
|
rpos /= glm::ivec2(scale);
|
|
return *(data + (rpos.x + rpos.y * dim) * scale) / 65535.0f;
|
|
}
|
|
} // namespace vkb
|