Check shader availability in getRequiredSubgroupStages

Author: kevyuu

include/nbl/video/IGPUComputePipeline.h

@@ -64,7 +64,7 @@ class IGPUComputePipeline : public IGPUPipeline<asset::IComputePipeline<const IG
 
             inline core::bitflag<hlsl::ShaderStage> getRequiredSubgroupStages() const
             {
-                if (shader.requiredSubgroupSize >= asset::IPipelineBase::SUBGROUP_SIZE::REQUIRE_4)
+                if (shader.shader && shader.requiredSubgroupSize >= asset::IPipelineBase::SUBGROUP_SIZE::REQUIRE_4)
                 {
                     return hlsl::ESS_COMPUTE;
                 }

include/nbl/video/IGPUGraphicsPipeline.h

@@ -72,7 +72,7 @@ class IGPUGraphicsPipeline : public IGPUPipeline<asset::IGraphicsPipeline<const
                 core::bitflag<hlsl::ShaderStage> stages;
                 auto processSpecInfo = [&](const SShaderSpecInfo& spec, hlsl::ShaderStage stage)
                 {
-                    if (spec.requiredSubgroupSize >= SUBGROUP_SIZE::REQUIRE_4) {
+                    if (spec.shader && spec.requiredSubgroupSize >= SUBGROUP_SIZE::REQUIRE_4) {
                       stages |= stage;
                     }
                 };

include/nbl/video/IGPURayTracingPipeline.h

@@ -149,7 +149,7 @@ class IGPURayTracingPipeline :  public IGPUPipeline<asset::IRayTracingPipeline<c
                 core::bitflag<hlsl::ShaderStage> stages;
                 auto processSpecInfo = [&](const SShaderSpecInfo& spec, hlsl::ShaderStage stage)
                 {
-                    if (spec.requiredSubgroupSize >= SUBGROUP_SIZE::REQUIRE_4) {
+                    if (spec.shader && spec.requiredSubgroupSize >= SUBGROUP_SIZE::REQUIRE_4) {
                       stages |= stage;
                     }
                 };