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framework/heightmap.cpp

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+/* 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