// default-major.slang

// The default layout should be column. 
// This test is disabled because `gfx` layer always initializes Slang to use row-major layout.
// To test this behavior we need to find a way to make `gfx` use Slang default instead.
// Unfortunately CPU and CUDA only work with row layout, so they have to be disabled here.

//DISABLE_TEST(compute):COMPARE_COMPUTE_EX:-cpu -compute -output-using-type -compile-arg -O3 -shaderobj
//DISABLE_TEST(compute):COMPARE_COMPUTE_EX:-slang -compute -output-using-type -shaderobj
//DISABLE_TEST(compute):COMPARE_COMPUTE_EX:-slang -compute -output-using-type -dx12 -shaderobj
//DISABLE_TEST(compute, vulkan):COMPARE_COMPUTE_EX:-vk -compute -output-using-type -shaderobj
//DISABLE_TEST(compute):COMPARE_COMPUTE_EX:-cuda -compute -output-using-type -shaderobj

// This data is in column major layout order.... 
//TEST_INPUT:cbuffer(data=[1.0 0.0 0.0 10.0  0.0 1.0 0.0 20.0  0.0 0.0 1.0 30.0  0.0 0.0 0.0 1.0]):name matrixBuffer

ConstantBuffer<float4x4> matrixBuffer;

//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name output
RWStructuredBuffer<float> output;

[numthreads(1, 1, 1)]
void computeMain(uint3 tid : SV_DispatchThreadID)
{
    float4 v = float4(1, 2, 3, 1);

    float4x4 M = matrixBuffer;
    
    float4 r = mul(v, M);

    output[0] = r.x;
    output[1] = r.y;
    output[2] = r.z;
    output[3] = r.w;
}