37 lines
1.3 KiB
Common Lisp
37 lines
1.3 KiB
Common Lisp
/* Copyright (c) 2021-2023, Arm Limited and Contributors
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 the "License";
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// This kernel fills the contents of the texture with a simple pattern which changes over time
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__kernel void generate_texture(__global unsigned char *data, float time)
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{
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int x = get_global_id(0);
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int y = get_global_id(1);
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int width = get_global_size(0);
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int height = get_global_size(1);
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int index = (y * width + x) * 4;
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float dx = (x / (float) width - 0.5f) * 2.0f;
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float dy = (y / (float) height - 0.5f) * 2.0f;
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float dist = sqrt(dx * dx + dy * dy);
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data[index] = (cos(dist * 25.0f - time * 5.0f) / 2.0f + 0.5f) * 255;
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data[index + 1] = (cos(dx * 50.0f) / 2.0f + 0.5f) * 255;
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data[index + 2] = (cos(dy * 50.0f) / 2.0f + 0.5f) * 255;
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data[index + 3] = 255;
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} |