Add missing support for gl_MeshViewCountNV/gl_MeshViewIndicesNV in task shaders

Test/spv.meshTaskShader.task

 #version 450
 
+#define MAX_VIEWS gl_MaxMeshViewCountNV
+
 #define BARRIER() \
     memoryBarrierShared(); \
     barrier();
@@ -19,12 +21,14 @@ shared vec4 mem[10];
 taskNV out Task {
     vec2 dummy;
     vec2 submesh[3];
+    uint viewID;
 } mytask;
 
 void main()
 {
     uint iid = gl_LocalInvocationID.x;
     uint gid = gl_WorkGroupID.x;
+    uint viewID = gl_MeshViewIndicesNV[gl_MeshViewCountNV%MAX_VIEWS];
 
     // 1. shared memory load and stores
     for (uint i = 0; i < 10; ++i) {
@@ -41,6 +45,7 @@ void main()
     mytask.submesh[0] = vec2(32.0, 33.0);
     mytask.submesh[1] = vec2(34.0, 35.0);
     mytask.submesh[2] = mytask.submesh[gid%2];
+    mytask.viewID     = viewID;
 
     BARRIER();
 

glslang/MachineIndependent/Initialize.cpp

@@ -5357,6 +5357,9 @@ void TBuiltIns::initialize(int version, EProfile profile, const SpvVersion& spvV
             "in highp uvec3 gl_GlobalInvocationID;"
             "in highp uint gl_LocalInvocationIndex;"
 
+            "in uint gl_MeshViewCountNV;"
+            "in uint gl_MeshViewIndicesNV[4];"
+
             "\n");
     }
 
@@ -8843,6 +8846,8 @@ void TBuiltIns::identifyBuiltIns(int version, EProfile profile, const SpvVersion
             symbolTable.setVariableExtensions("gl_LocalInvocationID",    1, &E_GL_NV_mesh_shader);
             symbolTable.setVariableExtensions("gl_GlobalInvocationID",   1, &E_GL_NV_mesh_shader);
             symbolTable.setVariableExtensions("gl_LocalInvocationIndex", 1, &E_GL_NV_mesh_shader);
+            symbolTable.setVariableExtensions("gl_MeshViewCountNV",      1, &E_GL_NV_mesh_shader);
+            symbolTable.setVariableExtensions("gl_MeshViewIndicesNV",    1, &E_GL_NV_mesh_shader);
 
             BuiltInVariable("gl_TaskCountNV",          EbvTaskCountNV,          symbolTable);
             BuiltInVariable("gl_WorkGroupSize",        EbvWorkGroupSize,        symbolTable);
@@ -8850,8 +8855,11 @@ void TBuiltIns::identifyBuiltIns(int version, EProfile profile, const SpvVersion
             BuiltInVariable("gl_LocalInvocationID",    EbvLocalInvocationId,    symbolTable);
             BuiltInVariable("gl_GlobalInvocationID",   EbvGlobalInvocationId,   symbolTable);
             BuiltInVariable("gl_LocalInvocationIndex", EbvLocalInvocationIndex, symbolTable);
+            BuiltInVariable("gl_MeshViewCountNV",      EbvMeshViewCountNV,      symbolTable);
+            BuiltInVariable("gl_MeshViewIndicesNV",    EbvMeshViewIndicesNV,    symbolTable);
 
             symbolTable.setVariableExtensions("gl_MaxTaskWorkGroupSizeNV", 1, &E_GL_NV_mesh_shader);
+            symbolTable.setVariableExtensions("gl_MaxMeshViewCountNV",     1, &E_GL_NV_mesh_shader);
 
             symbolTable.setFunctionExtensions("barrier",                   1, &E_GL_NV_mesh_shader);
             symbolTable.setFunctionExtensions("memoryBarrierShared",       1, &E_GL_NV_mesh_shader);