Add slang shader for mesh shader sample

Author: SaschaWillems

shaders/slang/compileshaders.py

@@ -48,6 +48,10 @@ def getShaderStages(filename):
             stages.append("callable")            
         if '[shader("compute")]' in filecontent:
             stages.append("compute")            
+        if '[shader("amplification")]' in filecontent:
+            stages.append("amplification")            
+        if '[shader("mesh")]' in filecontent:
+            stages.append("mesh")            
         f.close()
     return stages
 
@@ -58,6 +62,9 @@ def getShaderStages(filename):
 compile_single_sample = ""
 if args.sample != None:
     compile_single_sample = args.sample
+    if (not os.path.isdir(compile_single_sample)):
+        print("ERROR: No directory found with name %s" % compile_single_sample) 
+        exit(-1)
 
 dir_path = os.path.dirname(os.path.realpath(__file__))
 dir_path = dir_path.replace('\\', '/')
@@ -91,6 +98,10 @@ def getShaderStages(filename):
                         output_ext = ".rcall"
                     case "compute":
                         output_ext = ".comp"
+                    case "mesh":
+                        output_ext = ".mesh"
+                    case "amplification":
+                        output_ext = ".task"
                 output_file = input_file + output_ext + ".spv"
                 output_file = output_file.replace(".slang", "")
                 res = subprocess.call("%s %s -profile spirv_1_4 -matrix-layout-column-major -target spirv -o %s -entry %s -stage %s -warnings-disable 39001" % (compiler_path, input_file, output_file, entry_point, stage), shell=True)

shaders/slang/meshshader/meshshader.slang

@@ -0,0 +1,71 @@
+/* Copyright (c) 2025, Sascha Willems
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+struct VertexOutput
+{
+    float4 position : SV_Position;
+    float4 color;
+};
+
+struct UBO
+{
+	float4x4 projection;
+	float4x4 model;
+	float4x4 view;
+};
+ConstantBuffer<UBO> ubo;
+
+static const float4 positions[3] = {
+	float4( 0.0, -1.0, 0.0, 1.0),
+	float4(-1.0,  1.0, 0.0, 1.0),
+	float4( 1.0,  1.0, 0.0, 1.0)
+};
+
+static const float4 colors[3] = {
+	float4(0.0, 1.0, 0.0, 1.0),
+	float4(0.0, 0.0, 1.0, 1.0),
+	float4(1.0, 0.0, 0.0, 1.0)
+};
+
+struct DummyPayLoad
+{
+    uint dummyData;
+};
+
+// We don't use pay loads in this sample, but the fn call requires one
+groupshared DummyPayLoad dummyPayLoad;
+
+[shader("amplification")]
+[numthreads(1, 1, 1)]
+void amplificationMain()
+{
+    DispatchMesh(3, 1, 1, dummyPayLoad);
+}
+
+[shader("mesh")]
+[outputtopology("triangle")]
+[numthreads(1, 1, 1)]
+void meshMain(out indices uint3 triangles[1], out vertices VertexOutput vertices[3], uint3 DispatchThreadID : SV_DispatchThreadID)
+{
+	float4x4 mvp = mul(ubo.projection, mul(ubo.view, ubo.model));
+
+	float4 offset = float4(0.0, 0.0, float(DispatchThreadID.x), 0.0);
+
+	SetMeshOutputCounts(3, 1);
+	for (uint i = 0; i < 3; i++) {
+		vertices[i].position = mul(mvp, positions[i] + offset);
+		vertices[i].color = colors[i];
+	}
+
+	SetMeshOutputCounts(3, 1);
+	triangles[0] = uint3(0, 1, 2);
+}
+
+[shader("fragment")]
+float4 fragmentMain(VertexOutput input)
+{
+    return input.color;
+}