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-rw-r--r--docs/user-guide/a2-01-spirv-target-specific.md3
-rw-r--r--docs/user-guide/a2-02-metal-target-specific.md2
-rw-r--r--source/slang/glsl.meta.slang2
-rw-r--r--source/slang/slang-emit-spirv.cpp4
-rw-r--r--source/slang/slang-ir-glsl-legalize.cpp7
-rw-r--r--source/slang/slang-ir-legalize-varying-params.cpp9
-rw-r--r--source/slang/slang-ir-legalize-varying-params.h1
-rw-r--r--source/slang/slang-language-server-completion.cpp1
-rw-r--r--tests/glsl-intrinsic/point-coord.slang17
9 files changed, 45 insertions, 1 deletions
diff --git a/docs/user-guide/a2-01-spirv-target-specific.md b/docs/user-guide/a2-01-spirv-target-specific.md
index d37f41a5e..6d73199e0 100644
--- a/docs/user-guide/a2-01-spirv-target-specific.md
+++ b/docs/user-guide/a2-01-spirv-target-specific.md
@@ -62,6 +62,7 @@ The system-value semantics are translated to the following SPIR-V code.
| `SV_IsFrontFace` | `BuiltIn FrontFacing` |
| `SV_OutputControlPointID` | `BuiltIn InvocationId` |
| `SV_PointSize`<sup>*</sup> | `BuiltIn PointSize` |
+| `SV_PointCoord`<sup>*</sup> | `BuiltIn PointCoord` |
| `SV_Position` | `BuiltIn Position/FragCoord` |
| `SV_PrimitiveID` | `BuiltIn PrimitiveId` |
| `SV_RenderTargetArrayIndex` | `BuiltIn Layer` |
@@ -76,7 +77,7 @@ The system-value semantics are translated to the following SPIR-V code.
| `SV_ViewID` | `BuiltIn ViewIndex` |
| `SV_ViewportArrayIndex` | `BuiltIn ViewportIndex` |
-*Note* that `SV_DrawIndex` and `SV_PointSize` are Slang-specific semantics that are not defined in HLSL.
+*Note* that `SV_DrawIndex`, `SV_PointSize` and `SV_PointCoord` are Slang-specific semantics that are not defined in HLSL.
Behavior of `discard` after SPIR-V 1.6
diff --git a/docs/user-guide/a2-02-metal-target-specific.md b/docs/user-guide/a2-02-metal-target-specific.md
index bbcf28005..b14a4889e 100644
--- a/docs/user-guide/a2-02-metal-target-specific.md
+++ b/docs/user-guide/a2-02-metal-target-specific.md
@@ -34,6 +34,8 @@ The system-value semantics are translated to the following Metal attributes:
| `SV_GroupIndex` | Calculated from `SV_GroupThreadID` and group extents |
| `SV_InstanceID` | `[[instance_id]]` |
| `SV_IsFrontFace` | `[[front_facing]]` |
+| `SV_PointSize` | `[[point_size]]` |
+| `SV_PointCoord` | `[[point_coord]]` |
| `SV_PrimitiveID` | `[[primitive_id]]` |
| `SV_RenderTargetArrayIndex` | `[[render_target_array_index]]` |
| `SV_SampleIndex` | `[[sample_id]]` |
diff --git a/source/slang/glsl.meta.slang b/source/slang/glsl.meta.slang
index 8ffc50f6d..bbf0c40dd 100644
--- a/source/slang/glsl.meta.slang
+++ b/source/slang/glsl.meta.slang
@@ -96,6 +96,8 @@ public typealias dmat4x4 = matrix<double, 4, 4>;
public out float4 gl_Position : SV_Position;
public out float gl_PointSize : SV_PointSize;
+public in float2 gl_PointCoord : SV_PointCoord;
+
public in vec4 gl_FragCoord : SV_Position;
public out float gl_FragDepth : SV_Depth;
public out int gl_FragStencilRef : SV_StencilRef;
diff --git a/source/slang/slang-emit-spirv.cpp b/source/slang/slang-emit-spirv.cpp
index 18016d5fe..baef62f1c 100644
--- a/source/slang/slang-emit-spirv.cpp
+++ b/source/slang/slang-emit-spirv.cpp
@@ -5438,6 +5438,10 @@ struct SPIRVEmitContext : public SourceEmitterBase, public SPIRVEmitSharedContex
// float in hlsl & glsl
return getBuiltinGlobalVar(inst->getFullType(), SpvBuiltInPointSize, inst);
}
+ else if (semanticName == "sv_pointcoord")
+ {
+ return getBuiltinGlobalVar(inst->getFullType(), SpvBuiltInPointCoord, inst);
+ }
else if (semanticName == "sv_drawindex")
{
requireSPIRVCapability(SpvCapabilityDrawParameters);
diff --git a/source/slang/slang-ir-glsl-legalize.cpp b/source/slang/slang-ir-glsl-legalize.cpp
index 802fc1eb4..eb101de86 100644
--- a/source/slang/slang-ir-glsl-legalize.cpp
+++ b/source/slang/slang-ir-glsl-legalize.cpp
@@ -651,6 +651,13 @@ GLSLSystemValueInfo* getGLSLSystemValueInfo(
name = "gl_PointSize";
requiredType = builder->getBasicType(BaseType::Float);
}
+ else if (semanticName == "sv_pointcoord")
+ {
+ name = "gl_PointCoord";
+ requiredType = builder->getVectorType(
+ builder->getBasicType(BaseType::Float),
+ builder->getIntValue(builder->getIntType(), 2));
+ }
else if (semanticName == "sv_drawindex")
{
name = "gl_DrawID";
diff --git a/source/slang/slang-ir-legalize-varying-params.cpp b/source/slang/slang-ir-legalize-varying-params.cpp
index a0d0ef91d..6ece10457 100644
--- a/source/slang/slang-ir-legalize-varying-params.cpp
+++ b/source/slang/slang-ir-legalize-varying-params.cpp
@@ -3154,6 +3154,14 @@ protected:
result.permittedTypes.add(builder.getBasicType(BaseType::Float));
break;
}
+ case SystemValueSemanticName::PointCoord:
+ {
+ result.systemValueName = toSlice("point_coord");
+ result.permittedTypes.add(builder.getVectorType(
+ builder.getBasicType(BaseType::Float),
+ builder.getIntValue(builder.getIntType(), 2)));
+ break;
+ }
case SystemValueSemanticName::PrimitiveID:
{
result.systemValueName = toSlice("primitive_id");
@@ -3804,6 +3812,7 @@ protected:
case SystemValueSemanticName::OutputControlPointID:
case SystemValueSemanticName::PointSize:
+ case SystemValueSemanticName::PointCoord:
{
result.isUnsupported = true;
}
diff --git a/source/slang/slang-ir-legalize-varying-params.h b/source/slang/slang-ir-legalize-varying-params.h
index ae88fbad1..21674cd9e 100644
--- a/source/slang/slang-ir-legalize-varying-params.h
+++ b/source/slang/slang-ir-legalize-varying-params.h
@@ -56,6 +56,7 @@ void depointerizeInputParams(IRFunc* entryPoint);
M(IsFrontFace, SV_IsFrontFace) \
M(OutputControlPointID, SV_OutputControlPointID) \
M(PointSize, SV_PointSize) \
+ M(PointCoord, SV_PointCoord) \
M(PrimitiveID, SV_PrimitiveID) \
M(DrawIndex, SV_DrawIndex) \
M(RenderTargetArrayIndex, SV_RenderTargetArrayIndex) \
diff --git a/source/slang/slang-language-server-completion.cpp b/source/slang/slang-language-server-completion.cpp
index 1e5bae4b0..240102a22 100644
--- a/source/slang/slang-language-server-completion.cpp
+++ b/source/slang/slang-language-server-completion.cpp
@@ -115,6 +115,7 @@ static const char* hlslSemanticNames[] = {
"SV_OutputControlPointID",
"SV_Position",
"SV_PointSize",
+ "SV_PointCoord",
"SV_PrimitiveID",
"SV_DrawIndex",
"SV_RenderTargetArrayIndex",
diff --git a/tests/glsl-intrinsic/point-coord.slang b/tests/glsl-intrinsic/point-coord.slang
new file mode 100644
index 000000000..2681b93b7
--- /dev/null
+++ b/tests/glsl-intrinsic/point-coord.slang
@@ -0,0 +1,17 @@
+//TEST:SIMPLE(filecheck=CHECK_SPIRV): -entry main -stage fragment -target spirv
+//TEST:SIMPLE(filecheck=CHECK_GLSL): -entry main -stage fragment -target glsl
+//TEST:SIMPLE(filecheck=CHECK_METAL): -entry main -stage fragment -target metal
+
+#version 460
+
+out vec4 fragColor;
+
+void main()
+{
+ fragColor = vec4(gl_PointCoord.xy, 0, 0);
+
+ // CHECK_SPIRV: BuiltIn PointCoord
+ // CHECK_GLSL: gl_PointCoord
+ // CHECK_METAL: point_coord
+}
+
generated by cgit v1.2.3 (git 2.39.1) at 2026-06-01 04:29:48 +0000