Add `SampleGrad` overload for lod clamp. (#1711)

* Add `SampleGrad` overload for lod clamp.

* Fix gfx to run the test on vulkan.

* Whitespace change to trigger CI build

* remove presentFrame call in render-test

Co-authored-by: Yong He <yhe@nvidia.com>
Co-authored-by: Tim Foley <tfoleyNV@users.noreply.github.com>

2 files changed, 86 insertions, 0 deletions

diff --git a/tests/compute/texture-sample-grad-offset-clamp.slang b/tests/compute/texture-sample-grad-offset-clamp.slang
new file mode 100644
index 000000000..2a7d4d79a
--- /dev/null
+++ b/tests/compute/texture-sample-grad-offset-clamp.slang
@@ -0,0 +1,85 @@
+//TEST(compute, vulkan):COMPARE_RENDER_COMPUTE:-vk -shaderobj
+//TEST(compute):COMPARE_RENDER_COMPUTE:-shaderobj
+
+//TEST_INPUT: Texture2D(size=4, content = one):name=t2D
+//TEST_INPUT: Sampler:name=samplerState
+//TEST_INPUT: ubuffer(data=[0], stride=4):out,name=outputBuffer
+
+Texture2D  t2D;
+SamplerState samplerState;
+RWStructuredBuffer<float> outputBuffer;
+
+cbuffer Uniforms
+{
+	float4x4 modelViewProjection;
+}
+
+struct AssembledVertex
+{
+	float3	position;
+	float3	color;
+    float2  uv;
+};
+
+struct CoarseVertex
+{
+	float3	color;
+    float2  uv;
+};
+
+struct Fragment
+{
+	float4 color;
+};
+
+
+// Vertex  Shader
+
+struct VertexStageInput
+{
+	AssembledVertex assembledVertex	: A;
+};
+
+struct VertexStageOutput
+{
+	CoarseVertex	coarseVertex	: CoarseVertex;
+	float4			sv_position		: SV_Position;
+};
+
+VertexStageOutput vertexMain(VertexStageInput input)
+{
+	VertexStageOutput output;
+
+	float3 position = input.assembledVertex.position;
+	float3 color	= input.assembledVertex.color;
+
+	output.coarseVertex.color = color;
+	output.sv_position = mul(modelViewProjection, float4(position, 1.0));
+    output.coarseVertex.uv = input.assembledVertex.uv;
+	return output;
+}
+
+// Fragment Shader
+
+struct FragmentStageInput
+{
+	CoarseVertex	coarseVertex	: CoarseVertex;
+};
+
+struct FragmentStageOutput
+{
+	Fragment fragment	: SV_Target;
+};
+
+FragmentStageOutput fragmentMain(FragmentStageInput input)
+{
+	FragmentStageOutput output;
+
+	float3 color = input.coarseVertex.color;
+    float2 uv = input.coarseVertex.uv;
+	output.fragment.color = float4(color, 1.0);
+
+    float4 val = t2D.SampleGrad(samplerState, uv, float2(0,0), float2(0,0), 0, 0.5f);   
+    outputBuffer[0] = val.x;
+	return output;
+}
diff --git a/tests/compute/texture-sample-grad-offset-clamp.slang.expected.txt b/tests/compute/texture-sample-grad-offset-clamp.slang.expected.txt
new file mode 100644
index 000000000..47b9ba0c8
--- /dev/null
+++ b/tests/compute/texture-sample-grad-offset-clamp.slang.expected.txt
@@ -0,0 +1 @@
+3F800000
\ No newline at end of file