52 lines
1.7 KiB
HLSL
52 lines
1.7 KiB
HLSL
/* Copyright (c) 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.
|
|
*/
|
|
|
|
struct Registers
|
|
{
|
|
float phase;
|
|
};
|
|
[[vk::push_constant]] Registers registers;
|
|
|
|
struct VSOutput
|
|
{
|
|
float4 Pos : SV_POSITION;
|
|
[[vk::location(0)]] float2 UV : TEXCOORD0;
|
|
};
|
|
|
|
VSOutput main(uint VertexIndex : SV_VertexID, uint InstanceIndex : SV_InstanceID)
|
|
{
|
|
VSOutput output = (VSOutput) 0;
|
|
|
|
float2 local_offset = float2(VertexIndex & 1, VertexIndex >> 1);
|
|
output.UV = local_offset;
|
|
|
|
// A lazy quad rotation, could easily have been precomputed on CPU.
|
|
float cos_phase = cos(registers.phase);
|
|
float sin_phase = sin(registers.phase);
|
|
local_offset = mul(float2x2(cos_phase, -sin_phase, sin_phase, cos_phase), (local_offset - 0.5));
|
|
|
|
// To keep the sample as simple as possible, use InstanceIndex to move the quads around on screen.
|
|
int instance_x = InstanceIndex % 8 + 8;
|
|
int instance_y = InstanceIndex / 8;
|
|
float2 instance_offset = float2(instance_x, instance_y) / float2(15.0, 7.0);
|
|
instance_offset = 2.1 * (instance_offset - 0.5);
|
|
|
|
output.Pos = float4((0.10 * local_offset) + instance_offset, 0.0, 1.0);
|
|
|
|
return output;
|
|
}
|