Add CI coverage for Slang shader validation

.github/workflows/main.yml

@@ -38,6 +38,7 @@ jobs:
           compiler: gcc
           compiler_version: "14"
           python: 3.13
+          test_slang: ON
           extended_build_perfetto: ON
           extended_cmake_config: -DMATERIALX_BUILD_PERFETTO_TRACING=ON
 
@@ -298,6 +299,20 @@ jobs:
         python python/Scripts/generateshader.py resources/Materials/Examples --target msl --validator "xcrun metal --language=metal" --validatorArgs="-w"
         python python/Scripts/generateshader.py resources/Materials/TestSuite/stdlib --target msl --validator "xcrun metal --language=metal" --validatorArgs="-w"
 
+    - name: Shader Validation Tests (Slang)
+      if: matrix.test_slang == 'ON' && runner.os == 'Linux'
+      run: |
+        SLANG_VERSION=2026.10.2
+        curl -fsSL -o slang.tar.gz "https://github.com/shader-slang/slang/releases/download/v${SLANG_VERSION}/slang-${SLANG_VERSION}-linux-x86_64.tar.gz"
+        mkdir -p slang-release
+        tar -xzf slang.tar.gz -C slang-release
+        export LD_LIBRARY_PATH="$PWD/slang-release/lib:$PWD/slang-release/bin:$LD_LIBRARY_PATH"
+        SLANGC="$PWD/slang-release/bin/slangc"
+        chmod +x "$SLANGC"
+        "$SLANGC" -v
+        python python/Scripts/generateshader.py resources/Materials/Examples/StandardSurface --target slang --validator "$SLANGC"
+        python python/Scripts/generateshader.py resources/Materials/TestSuite/stdlib --target slang --validator "$SLANGC"
+
     - name: Coverage Analysis Tests
       if: matrix.coverage_analysis == 'ON'
       run: |

libraries/stdlib/genslang/lib/mx_texture.slang

@@ -24,7 +24,7 @@ struct SamplerTexture2D
         tex.GetDimensions(0, width, height, numberOfLevels);
         return numberOfLevels;
     }
-}
+};
 
 float4 textureLod(SamplerTexture2D tex, float2 uv, float lod)
 {

python/Scripts/generateshader.py

@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 '''
 Generate shader code for each renderable element in a MaterialX document or folder.
-The currently supported target languages are GLSL, ESSL, MSL, OSL, and MDL.
+The currently supported target languages are GLSL, ESSL, Vulkan, WGSL, MSL, Slang, OSL, and MDL.
 '''
 
 import sys, os, argparse, subprocess
@@ -47,7 +47,7 @@ def main():
     parser = argparse.ArgumentParser(description='Generate shader code for each renderable element in a MaterialX document or folder.')
     parser.add_argument('--path', dest='paths', action='append', nargs='+', help='An additional absolute search path location (e.g. "/projects/MaterialX")')
     parser.add_argument('--library', dest='libraries', action='append', nargs='+', help='An additional relative path to a custom data library folder (e.g. "libraries/custom")')
-    parser.add_argument('--target', dest='target', default='glsl', help='Target shader generator to use (e.g. "glsl, osl, mdl, essl, vulkan, wgsl"). Default is glsl.')
+    parser.add_argument('--target', dest='target', default='glsl', help='Target shader generator to use (e.g. "glsl, essl, vulkan, wgsl, msl, slang, osl, mdl"). Default is glsl.')
     parser.add_argument('--outputPath', dest='outputPath', help='File path to output shaders to. If not specified, is the location of the input document is used.')
     parser.add_argument('--validator', dest='validator', nargs='?', const=' ', type=str, help='Name of executable to perform source code validation.')
     parser.add_argument('--validatorArgs', dest='validatorArgs', nargs='?', const=' ', type=str, help='Optional arguments for code validator.')
@@ -158,7 +158,7 @@ def main():
             if shader:
                 # Use extension of .vert and .frag as it's type is
                 # recognized by glslangValidator
-                if gentarget in ['glsl', 'essl', 'vulkan', 'msl', 'wgsl']:
+                if gentarget in ['glsl', 'essl', 'vulkan', 'msl', 'wgsl', 'slang']:
                     pixelSource = shader.getSourceCode(mx_gen_shader.PIXEL_STAGE)
                     filename = pathPrefix + "/" + shader.getName() + "." + gentarget + ".frag"
                     print('--- Wrote pixel shader to: ' + filename)

source/MaterialXGenSlang/SlangShaderGenerator.cpp

@@ -372,7 +372,7 @@ void SlangShaderGenerator::emitInputs(GenContext& context, ShaderStage& stage) c
             emitLine("struct " + vertexInputs.getName(), stage, false);
             emitScopeBegin(stage);
             emitVariableDeclarations(vertexInputs, _syntax->getInputQualifier(), Syntax::SEMICOLON, context, stage, false);
-            emitScopeEnd(stage);
+            emitScopeEnd(stage, true);
             emitLineBreak(stage);
 
             for (size_t i = 0; i < vertexInputs.size(); ++i)
@@ -398,7 +398,7 @@ void SlangShaderGenerator::emitInputs(GenContext& context, ShaderStage& stage) c
         {
             emitVariableDeclarations(vertexData, EMPTY_STRING, Syntax::SEMICOLON, context, stage, false);
         }
-        emitScopeEnd(stage, false, false);
+        emitScopeEnd(stage, true);
         emitLineBreak(stage);
         emitLine("static " + vertexData.getName() + " vd", stage);
     }
@@ -416,7 +416,7 @@ void SlangShaderGenerator::emitOutputs(GenContext& context, ShaderStage& stage)
         {
             emitVariableDeclarations(vertexData, EMPTY_STRING, Syntax::SEMICOLON, context, stage, false);
         }
-        emitScopeEnd(stage);
+        emitScopeEnd(stage, true);
         emitLineBreak(stage);
         emitLineBreak(stage);
     }