Add glsl intrinsic for SampleCmpLevelZero with offset and correct existing intrinsic (#2975)

* Correct glsl intrinsic for SampleCmpLevelZero without offset

* Add glsl intrinsic for SampleCmpLevelZero with offset

* Add test for samplecmplevelzero glsl translation

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Co-authored-by: Yong He <yonghe@outlook.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/tests/cross-compile/glsl-samplecmplevelzero.slang b/tests/cross-compile/glsl-samplecmplevelzero.slang
new file mode 100644
index 000000000..4bfd557cc
--- /dev/null
+++ b/tests/cross-compile/glsl-samplecmplevelzero.slang
@@ -0,0 +1,12 @@
+//TEST:CROSS_COMPILE(filecheck=CHECK): -profile ps_5_0 -entry main -target glsl
+
+// CHECK: float _S3 = (textureLod(sampler2DShadow(shadowMap_0,sampler_0), vec3((_S2), (0.0)), 0));
+// CHECK: float _S4 = (textureLodOffset(sampler2DShadow(shadowMap_0,sampler_0), vec3((_S2), (0.0)), 0, (ivec2(1, 1))));
+
+Texture2D shadowMap;
+SamplerComparisonState sampler;
+float4 main(float4 p : SV_POSITION)
+{
+    return shadowMap.SampleCmpLevelZero(sampler, float2(0.0), 0.0)
+         + shadowMap.SampleCmpLevelZero(sampler, float2(0.0), 0.0, int2(1,1));
+}