Validation layer keep complaining about my mesh shader

[Haiiro_no_Jiren]

Im new to this mesh shader, I managed to draw a triangle on the window but the validation layer complain

UNASSIGNED-CoreValidation-Shader-PointSizeMissing(ERROR / SPEC): msgNum: -211210120 - Validation Error: [ UNASSIGNED-CoreValidation-Shader-PointSizeMissing ] Object 0: VK_NULL_HANDLE, type = VK_OBJECT_TYPE_PIPELINE; | MessageID = 0xf3693078 | Pipeline topology is set to POINT_LIST, but PointSize is not written to in the shader corresponding to VK_SHADER_STAGE_MESH_BIT_NV.
Objects: 1
[0] 0, type: 19, name: NULL

this is the shader

#version 450

#extension GL_NV_mesh_shader : require

layout(local_size_x = 1) in;
layout(triangles, max_vertices = 3, max_primitives = 1) out;

struct Vertex
{
    vec4 position;
    vec4 color;
};

layout(set = 0, binding = 0) buffer Vertices
{
    Vertex vertex[];
}vertices;

layout(location = 0) out Color
{
    vec4 color;
}color[];

void main()
{
    for(int i = 0; i < 3; ++i)
    {
        gl_MeshVerticesNV[i].gl_Position = vertices.vertex[i].position;

        color[i].color = vertices.vertex[i].color;

        gl_PrimitiveIndicesNV[i] = i;

    }

    gl_PrimitiveCountNV = 1;
}

btw my device is rtx 3070. thank you

[Sascha_Willems]

The validation message hints at your pipeline topology. So how are you setting up your pipeline?

[Haiiro_no_Jiren]

VkPipelineShaderStageCreateInfo shaderStages[2] = {};    
shaderStages[0] = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO;
shaderStages[0].module = meshShader;
shaderStages[0].pName = "main";
shaderStages[0].stage = VK_SHADER_STAGE_MESH_BIT_NV;

shaderStages[1] = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO;
shaderStages[1].module = fragmentShader;
shaderStages[1].pName = "main";
shaderStages[1].stage = VK_SHADER_STAGE_FRAGMENT_BIT;

VkPipelineColorBlendAttachmentState colorBlendAttachmentState = {};
colorBlendAttachmentState.colorWriteMask = VK_COLOR_COMPONENT_R_BIT | VK_COLOR_COMPONENT_G_BIT | VK_COLOR_COMPONENT_B_BIT | VK_COLOR_COMPONENT_A_BIT;

VkPipelineColorBlendStateCreateInfo colorBlendState = {};
colorBlendState.sType = VK_STRUCTURE_TYPE_PIPELINE_COLOR_BLEND_STATE_CREATE_INFO;
colorBlendState.attachmentCount = 1;
colorBlendState.pAttachments = &colorBlendAttachmentState;

VkPipelineViewportStateCreateInfo viewportState = {};
viewportState.sType = VK_STRUCTURE_TYPE_PIPELINE_VIEWPORT_STATE_CREATE_INFO;
viewportState.viewportCount = 1;
viewportState.scissorCount = 1;

VkPipelineRasterizationStateCreateInfo rasterizationState = {};
rasterizationState.sType = VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_STATE_CREATE_INFO;
rasterizationState.lineWidth = 1.0f;
rasterizationState.polygonMode = VK_POLYGON_MODE_FILL;
rasterizationState.cullMode = VK_CULL_MODE_BACK_BIT;
rasterizationState.frontFace = VK_FRONT_FACE_CLOCKWISE;

VkPipelineMultisampleStateCreateInfo multisampleState = {};
multisampleState.sType = VK_STRUCTURE_TYPE_PIPELINE_MULTISAMPLE_STATE_CREATE_INFO;
multisampleState.rasterizationSamples = VK_SAMPLE_COUNT_1_BIT;

VkDynamicState dynamicStates[2];
dynamicStates[0] = VK_DYNAMIC_STATE_VIEWPORT;
dynamicStates[1] = VK_DYNAMIC_STATE_SCISSOR;

VkPipelineDynamicStateCreateInfo dynamicStateInfo = {};
dynamicStateInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_DYNAMIC_STATE_CREATE_INFO;
dynamicStateInfo.dynamicStateCount = 2;
dynamicStateInfo.pDynamicStates = dynamicStates;

VkGraphicsPipelineCreateInfo pipelineCreateInfo = {};
pipelineCreateInfo.sType = VK_STRUCTURE_TYPE_GRAPHICS_PIPELINE_CREATE_INFO;
pipelineCreateInfo.layout = g_PipelineLayout;
pipelineCreateInfo.renderPass = g_RenderPass;
pipelineCreateInfo.subpass = 0;
pipelineCreateInfo.pColorBlendState = &colorBlendState;
pipelineCreateInfo.pDynamicState = &dynamicStateInfo;
pipelineCreateInfo.pMultisampleState = &multisampleState;
pipelineCreateInfo.pRasterizationState = &rasterizationState;
pipelineCreateInfo.pViewportState = &viewportState;
pipelineCreateInfo.stageCount = 2;
pipelineCreateInfo.pStages = shaderStages;

CHECK_VK_RESULT(vkCreateGraphicsPipelines(g_Device, g_PipelineCache, 1, &pipelineCreateInfo, nullptr, &g_Pipeline));

That s how i construct the graphics pipeline.According to the spec the VkGraphicsPipelineCreateInfo(3) the * pInputAssemblyState is a pointer to a VkPipelineInputAssemblyStateCreateInfo structure which determines input assembly behavior, as described in Drawing Commands. It is ignored if the pipeline includes a mesh shader stage.

[Haiiro_no_Jiren]

is it bug of the validation layer?

[Sascha_Willems]

Yes, this seems to be a bug in the validation layers that has recently been fixed: Fix mesh pipeline validation by ncesario-lunarg · Pull Request #2697 · KhronosGroup/Vulkan-ValidationLayers · GitHub

So you can safely ignore that error.

[Haiiro_no_Jiren]

wow thanks sir. btw your vulkan example is very helpful thank you again