64 lines
1.9 KiB
HLSL
64 lines
1.9 KiB
HLSL
/* Copyright (c) 2024, Sascha Willems
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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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struct VSInput
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{
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[[vk::location(0)]] float3 Pos : POSITION0;
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};
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struct UBO
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{
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float4x4 projection;
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float4x4 view;
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float4x4 model;
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float4x4 viewProjectionInverse;
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};
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[[vk::binding(0, 0)]]
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ConstantBuffer<UBO> ubo : register(b0);
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struct VSOutput
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{
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float4 Pos : SV_POSITION;
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[[vk::location(0)]] float3 nearPoint : VECTOR0;
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[[vk::location(1)]] float3 farPoint : VECTOR1;
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[[vk::location(2)]] float4x4 view : MATRIX0;
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[[vk::location(6)]] float4x4 projection : MATRIX1;
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};
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float3 unprojectPoint(float x, float y, float z, float4x4 viewProjectionInverse) {
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float4 clipSpacePos = float4(x, y, z, 1.0);
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float4 eyeSpacePos = mul(viewProjectionInverse, clipSpacePos);
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return eyeSpacePos.xyz / eyeSpacePos.w;
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}
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static float3 gridPlane[6] = {
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float3(1, 1, 0), float3(-1, -1, 0), float3(-1, 1, 0),
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float3(-1, -1, 0), float3(1, 1, 0), float3(1, -1, 0)
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};
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VSOutput main(VSInput input, uint VertexIndex : SV_VertexID)
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{
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float3 pos = gridPlane[VertexIndex].xyz;
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VSOutput output = (VSOutput) 0;
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output.nearPoint = unprojectPoint(pos.x, pos.y, 0.0, ubo.viewProjectionInverse);
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output.farPoint = unprojectPoint(pos.x, pos.y, 1.0, ubo.viewProjectionInverse);
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output.view = ubo.view;
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output.projection = ubo.projection;
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output.Pos = float4(pos, 1.0);
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return output;
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} |