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//TEST(compute):COMPARE_COMPUTE_EX(filecheck-buffer=CHECK):-cuda -compute -shaderobj -output-using-type
//TEST(compute):COMPARE_COMPUTE_EX(filecheck-buffer=CHECK):-dx12 -compute -profile cs_6_0 -shaderobj -output-using-type
// Test CUDA Gather runtime behavior - compare with known gather pattern
// tex2Dgather samples 4 texels in 2x2 pattern around coordinate
//TEST_INPUT: Texture2D(size=4, content = one):name testTexture
// Create a 4x4 texture with 1.0 values - simple but non-zero to verify gather works
Texture2D<float4> testTexture;
//TEST_INPUT: Sampler:name samplerState
SamplerState samplerState;
//TEST_INPUT: ubuffer(data=[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0], stride=4):out,name outputBuffer
RWStructuredBuffer<float> outputBuffer;
[numthreads(1, 1, 1)]
void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
{
// Simple gather test - sample at center of 2x2 region
// This should gather from texels (0,0), (1,0), (0,1), (1,1)
float2 coords = float2(0.75, 0.75); // Between texels for gather
// Test basic gather - should return 4 values in specific order
float4 gathered = testTexture.GatherRed(samplerState, coords);
// Store the gathered values
outputBuffer[0] = gathered.x; // Should be consistent pattern
outputBuffer[1] = gathered.y;
outputBuffer[2] = gathered.z;
outputBuffer[3] = gathered.w;
// Also test that gather actually works by using texture coordinates
// as the texture values (coord-based pattern)
int2 texelCoord = int2(dispatchThreadID.xy);
float coordValue = float(texelCoord.x + texelCoord.y * 4); // Create pattern: 0,1,2,3,4,5,6,7...
// Store marker value like CUDA reference (42)
outputBuffer[4] = 42.0; // Marker to verify test is working
// Test another gather position
float4 gathered2 = testTexture.GatherRed(samplerState, float2(1.25, 1.25));
outputBuffer[5] = gathered2.x;
outputBuffer[6] = gathered2.y;
outputBuffer[7] = gathered2.z;
outputBuffer[8] = gathered2.w;
}
// Test results - texture filled with 1.0 values
// CHECK: 1.0
// CHECK-NEXT: 1.0
// CHECK-NEXT: 1.0
// CHECK-NEXT: 1.0
// CHECK-NEXT: 42.0
// CHECK-NEXT: 1.0
// CHECK-NEXT: 1.0
// CHECK-NEXT: 1.0
// CHECK-NEXT: 1.0
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