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[Feat] (DirectVulkan): run the tessellation stages

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The backend already turned a tessellation control/evaluation shader into the
right VkShaderStage, but nothing downstream knew what to do with it: GL_PATCHES
had no topology, so it fell through to the triangle-list default, and the
pipeline carried no tessellation state at all. A GL_PATCHES draw therefore ran
the vertex and fragment stages over raw triangles.

Map GL_PATCHES to VK_PRIMITIVE_TOPOLOGY_PATCH_LIST, carry GL_PATCH_VERTICES into
the pipeline as patchControlPoints (part of the key, since two patch sizes are
two pipelines), attach VkPipelineTessellationStateCreateInfo for a patch topology
only, and enable the tessellationShader device feature.

POST reports the feature, because without it a program with a tessellation stage
cannot build a pipeline at all and GL_PATCHES draws render nothing.
This commit is contained in:
BZLZHH
2026-08-04 20:03:24 -04:00
parent 6ea7ccdf64
commit cb2ba71feb
5 changed files with 28 additions and 0 deletions
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MobileGL/MG_Backend/DirectVulkan/Renderer/PipelineFactory.cpp
+8
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@@ -205,6 +205,7 @@ namespace MobileGL::MG_Backend::DirectVulkan {
XXHASH_VERIFY(XXH64_update(m_hashState, &payload.topology, sizeof(payload.topology)));
XXHASH_VERIFY(
XXH64_update(m_hashState, &payload.primitiveRestartEnable, sizeof(payload.primitiveRestartEnable)));
XXHASH_VERIFY(XXH64_update(m_hashState, &payload.patchControlPoints, sizeof(payload.patchControlPoints)));
XXHASH_VERIFY(XXH64_update(m_hashState, &payload.polygonMode, sizeof(payload.polygonMode)));
XXHASH_VERIFY(XXH64_update(m_hashState, &payload.cullMode, sizeof(payload.cullMode)));
XXHASH_VERIFY(XXH64_update(m_hashState, &payload.frontFace, sizeof(payload.frontFace)));
@@ -380,6 +381,11 @@ namespace MobileGL::MG_Backend::DirectVulkan {
ia.topology = payload.topology;
ia.primitiveRestartEnable = payload.primitiveRestartEnable ? VK_TRUE : VK_FALSE;
// Only a patch topology has a tessellation stage to configure; leaving the pointer null
// otherwise is what the spec expects.
VkPipelineTessellationStateCreateInfo tessellation{VK_STRUCTURE_TYPE_PIPELINE_TESSELLATION_STATE_CREATE_INFO};
tessellation.patchControlPoints = payload.patchControlPoints;
VkPipelineViewportStateCreateInfo vpci{VK_STRUCTURE_TYPE_PIPELINE_VIEWPORT_STATE_CREATE_INFO};
vpci.viewportCount = 1;
vpci.scissorCount = 1;
@@ -444,6 +450,8 @@ namespace MobileGL::MG_Backend::DirectVulkan {
gpi.pStages = payload.stages->data();
gpi.pVertexInputState = payload.vertexInputState;
gpi.pInputAssemblyState = &ia;
gpi.pTessellationState =
payload.topology == VK_PRIMITIVE_TOPOLOGY_PATCH_LIST ? &tessellation : nullptr;
gpi.pViewportState = &vpci;
gpi.pRasterizationState = &raster;
gpi.pMultisampleState = &ms;