fix a bug in Graphics Pipeline Creation Parameter validation of Shader Spec info

what idiot wrote that? - me!

Author: devshgraphicsprogramming

include/nbl/asset/IGraphicsPipeline.h

@@ -100,30 +100,29 @@ class IGraphicsPipeline : public IPipeline<PipelineLayoutType>
                     // TODO: check rasterization samples, etc.
                     //rp->getCreationParameters().subpasses[i]
 
-                    std::bitset<GRAPHICS_SHADER_STAGE_COUNT> stagePresence = {};
+                    core::bitflag<ICPUShader::E_SHADER_STAGE> stagePresence = {};
                     for (const auto info : shaders)
                     if (info.shader)
                     {
                         if (!extra(info))
                             return false;
                         const auto stage = info.shader->getStage();
-                        if (stage>=GRAPHICS_SHADER_STAGE_COUNT)
+                        if (stage>ICPUShader::ESS_FRAGMENT)
                             return false;
-                        const auto stageIx = hlsl::findLSB(stage);
-                        if (stagePresence.test(stageIx))
+                        if (stagePresence.hasFlags(stage))
                             return false;
-                        stagePresence.set(stageIx);
+                        stagePresence |= stage;
                     }
                     // https://registry.khronos.org/vulkan/specs/1.3-extensions/man/html/VkGraphicsPipelineCreateInfo.html#VUID-VkGraphicsPipelineCreateInfo-stage-02096
-                    if (!stagePresence.test(ICPUShader::ESS_VERTEX))
+                    if (!stagePresence.hasFlags(ICPUShader::ESS_VERTEX))
                         return false;
                     // https://registry.khronos.org/vulkan/specs/1.3-extensions/man/html/VkGraphicsPipelineCreateInfo.html#VUID-VkGraphicsPipelineCreateInfo-pStages-00729
                     // https://registry.khronos.org/vulkan/specs/1.3-extensions/man/html/VkGraphicsPipelineCreateInfo.html#VUID-VkGraphicsPipelineCreateInfo-pStages-00730
-                    if (stagePresence.test(ICPUShader::ESS_TESSELLATION_CONTROL)!=stagePresence.test(ICPUShader::ESS_TESSELLATION_EVALUATION))
+                    if (stagePresence.hasFlags(ICPUShader::ESS_TESSELLATION_CONTROL)!=stagePresence.hasFlags(ICPUShader::ESS_TESSELLATION_EVALUATION))
                         return false;
                     // https://registry.khronos.org/vulkan/specs/1.3-extensions/man/html/VkGraphicsPipelineCreateInfo.html#VUID-VkGraphicsPipelineCreateInfo-pStages-08888
                     // https://registry.khronos.org/vulkan/specs/1.3-extensions/man/html/VkGraphicsPipelineCreateInfo.html#VUID-VkGraphicsPipelineCreateInfo-topology-08889
-                    if (stagePresence.test(ICPUShader::ESS_TESSELLATION_EVALUATION)!=(cached.primitiveAssembly.primitiveType==EPT_PATCH_LIST))
+                    if (stagePresence.hasFlags(ICPUShader::ESS_TESSELLATION_EVALUATION)!=(cached.primitiveAssembly.primitiveType==EPT_PATCH_LIST))
                         return false;
 
                     return true;

include/nbl/video/IGPUGraphicsPipeline.h

@@ -46,6 +46,9 @@ class IGPUGraphicsPipeline : public IBackendObject, public asset::IGraphicsPipel
                     const auto dataSize = info.valid();
                     if (dataSize<0)
                         return false;
+                    else if (dataSize==0)
+                        return true;
+
                     const size_t count = info.entries ? info.entries->size():0x80000000ull;
                     if (count>0x7fffffff)
                         return {};