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72 lines
2.8 KiB
C++
72 lines
2.8 KiB
C++
/*
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* Copyright (c) Contributors to the Open 3D Engine Project.
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* For complete copyright and license terms please see the LICENSE at the root of this distribution.
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*
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* SPDX-License-Identifier: Apache-2.0 OR MIT
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*
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*/
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#include <TriangleInputHelper.h>
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namespace UnitTest
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{
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TriangleInput CreatePlane(float width, float height, AZ::u32 segmentsX, AZ::u32 segmentsY)
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{
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TriangleInput plane;
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plane.m_vertices.resize((segmentsX + 1) * (segmentsY + 1));
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plane.m_uvs.resize((segmentsX + 1) * (segmentsY + 1));
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plane.m_indices.resize((segmentsX * segmentsY * 2) * 3);
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const NvCloth::SimParticleFormat topLeft(
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-width * 0.5f,
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-height * 0.5f,
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0.0f,
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0.0f);
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// Vertices and UVs
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for (AZ::u32 y = 0; y < segmentsY + 1; ++y)
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{
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for (AZ::u32 x = 0; x < segmentsX + 1; ++x)
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{
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const AZ::u32 segmentIndex = x + y * (segmentsX + 1);
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const float fractionX = ((float)x / (float)segmentsX);
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const float fractionY = ((float)y / (float)segmentsY);
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NvCloth::SimParticleFormat position(
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fractionX * width,
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fractionY * height,
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0.0f,
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(y > 0) ? 1.0f : 0.0f);
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plane.m_vertices[segmentIndex] = topLeft + position;
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plane.m_uvs[segmentIndex] = NvCloth::SimUVType(fractionX, fractionY);
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}
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}
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// Triangles indices
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for (AZ::u32 y = 0; y < segmentsY; ++y)
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{
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for (AZ::u32 x = 0; x < segmentsX; ++x)
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{
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const AZ::u32 segmentIndex = (x + y * segmentsX) * 2 * 3;
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const AZ::u32 firstTriangleStartIndex = segmentIndex;
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const AZ::u32 secondTriangleStartIndex = segmentIndex + 3;
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//Top left to bottom right
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plane.m_indices[firstTriangleStartIndex + 0] = static_cast<NvCloth::SimIndexType>((x + 0) + (y + 0) * (segmentsX + 1));
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plane.m_indices[firstTriangleStartIndex + 1] = static_cast<NvCloth::SimIndexType>((x + 1) + (y + 0) * (segmentsX + 1));
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plane.m_indices[firstTriangleStartIndex + 2] = static_cast<NvCloth::SimIndexType>((x + 1) + (y + 1) * (segmentsX + 1));
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plane.m_indices[secondTriangleStartIndex + 0] = static_cast<NvCloth::SimIndexType>((x + 0) + (y + 0) * (segmentsX + 1));
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plane.m_indices[secondTriangleStartIndex + 1] = static_cast<NvCloth::SimIndexType>((x + 1) + (y + 1) * (segmentsX + 1));
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plane.m_indices[secondTriangleStartIndex + 2] = static_cast<NvCloth::SimIndexType>((x + 0) + (y + 1) * (segmentsX + 1));
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}
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}
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return plane;
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}
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} // namespace UnitTest
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