Add-support-for-SPV_NV_mesh_shader

Test/spv.meshShaderBuiltins.mesh

@@ -0,0 +1,63 @@
+#version 460
+
+#define MAX_VER  81
+#define MAX_PRIM 32
+
+#define BARRIER() \
+    memoryBarrierShared(); \
+    barrier();
+
+#extension GL_NV_mesh_shader : enable
+
+layout(local_size_x = 32) in;
+
+layout(max_vertices=MAX_VER) out;
+layout(max_primitives=MAX_PRIM) out;
+layout(triangles) out;
+
+// test use of builtins in mesh shaders:
+
+void main()
+{
+    uint iid = gl_LocalInvocationID.x;
+    uint gid = gl_WorkGroupID.x;
+
+    gl_MeshVerticesNV[iid].gl_Position = vec4(1.0);
+    gl_MeshVerticesNV[iid].gl_PointSize = 2.0;
+    gl_MeshVerticesNV[iid].gl_ClipDistance[3] = 3.0;
+    gl_MeshVerticesNV[iid].gl_CullDistance[2] = 4.0;
+
+    BARRIER();
+
+    gl_MeshVerticesNV[iid+1].gl_Position = gl_MeshVerticesNV[iid].gl_Position;
+    gl_MeshVerticesNV[iid+1].gl_PointSize = gl_MeshVerticesNV[iid].gl_PointSize;
+    gl_MeshVerticesNV[iid+1].gl_ClipDistance[3] = gl_MeshVerticesNV[iid].gl_ClipDistance[3];
+    gl_MeshVerticesNV[iid+1].gl_CullDistance[2] = gl_MeshVerticesNV[iid].gl_CullDistance[2];
+
+    BARRIER();
+
+    gl_MeshPrimitivesNV[iid].gl_PrimitiveID = 6;
+    gl_MeshPrimitivesNV[iid].gl_Layer = 7;
+    gl_MeshPrimitivesNV[iid].gl_ViewportIndex = 8;
+    gl_MeshPrimitivesNV[iid].gl_ViewportMask[0] = 9;
+
+    BARRIER();
+
+    gl_MeshPrimitivesNV[iid+1].gl_PrimitiveID = gl_MeshPrimitivesNV[iid].gl_PrimitiveID;
+    gl_MeshPrimitivesNV[iid+1].gl_Layer = gl_MeshPrimitivesNV[iid].gl_Layer;
+    gl_MeshPrimitivesNV[iid+1].gl_ViewportIndex = gl_MeshPrimitivesNV[iid].gl_ViewportIndex;
+    gl_MeshPrimitivesNV[iid+1].gl_ViewportMask[0] = gl_MeshPrimitivesNV[iid].gl_ViewportMask[0];
+
+    BARRIER();
+
+    // should truncate 257 -> 1
+    gl_PrimitiveIndicesNV[0] = 257;
+    gl_PrimitiveIndicesNV[gid] = gl_PrimitiveIndicesNV[gid-1];
+
+    // writes 4 indices at offset gl_DrawID
+    writePackedPrimitiveIndices4x8NV(gl_DrawID, 0x01020304);
+
+    gl_PrimitiveCountNV = MAX_PRIM * 3;
+
+    BARRIER();
+}