[Feat] (MG_Backend/DirectVulkan): wire glPolygonMode and glColorMaski into pipeline creation

Consume the polygon mode and per-draw-buffer color write masks that the
frontend already tracks, with runtime fallback for the device features
they require.

glPolygonMode:
- Add ConvertPolygonModeToVkEnum (GL_FILL/LINE/POINT -> VkPolygonMode).
- Thread a polygonMode field through PipelineCreatePayload, fold it into
  the pipeline cache hash (distinct modes need distinct pipelines), and
  apply it in PipelineFactory instead of the hardcoded VK_POLYGON_MODE_FILL.
- LINE/POINT require the fillModeNonSolid device feature: detect and
  enable it at device creation, cache m_fillModeNonSolidFeatureEnabled,
  and fall back to FILL at pipeline-build time when it is absent.

glColorMaski:
- The per-attachment color-blend loop now reads GetColorMaskIndexed(i)
  instead of the broadcast GetColorMask(), so each draw buffer gets its
  own write mask (already covered by the pipeline hash).
- Divergent per-attachment masks require independentBlend: cache
  m_independentBlendFeatureEnabled (was enabled but never recorded) and
  fall back to draw buffer 0's mask for every attachment when it is absent.

The internal depth-mipmap utility pipeline keeps VK_POLYGON_MODE_FILL (not
GL-driven). Library builds clean; full SanityTest sweep green (30/30).

MobileGL/MG_Backend/DirectVulkan/Renderer/PipelineFactory.cpp

@@ -126,6 +126,7 @@ namespace MobileGL::MG_Backend::DirectVulkan {
         XXHASH_VERIFY(XXH64_update(m_hashState, &payload.rasterizationSamples, sizeof(payload.rasterizationSamples)));
         XXHASH_VERIFY(XXH64_update(m_hashState, &payload.subpass, sizeof(payload.subpass)));
         XXHASH_VERIFY(XXH64_update(m_hashState, &payload.topology, sizeof(payload.topology)));
+        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)));
         XXHASH_VERIFY(XXH64_update(m_hashState, &payload.depthTestEnable, sizeof(payload.depthTestEnable)));
@@ -217,7 +218,7 @@ namespace MobileGL::MG_Backend::DirectVulkan {
         vpci.scissorCount = 1;
 
         VkPipelineRasterizationStateCreateInfo raster{VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_STATE_CREATE_INFO};
-        raster.polygonMode = VK_POLYGON_MODE_FILL;
+        raster.polygonMode = payload.polygonMode;
         raster.cullMode = payload.cullMode;
         raster.frontFace = payload.frontFace;
         raster.depthBiasEnable = payload.depthBiasEnable ? VK_TRUE : VK_FALSE;

MobileGL/MG_Backend/DirectVulkan/Renderer/PipelineFactory.h

@@ -29,6 +29,7 @@ namespace MobileGL::MG_Backend::DirectVulkan {
             VkSampleCountFlagBits rasterizationSamples = VK_SAMPLE_COUNT_1_BIT;
             Uint32 subpass = 0;
             VkPrimitiveTopology topology = VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST;
+            VkPolygonMode polygonMode = VK_POLYGON_MODE_FILL;
             VkCullModeFlags cullMode = VK_CULL_MODE_BACK_BIT;
             VkFrontFace frontFace = VK_FRONT_FACE_CLOCKWISE;
             Bool depthTestEnable = false;

MobileGL/MG_Backend/DirectVulkan/Renderer/VulkanRenderer.cpp

@@ -2964,12 +2964,14 @@ void main() {
         auto stencilTestEnabled = MG_State::pGLContext->IsCapabilityEnabled(CapabilityInput::StencilTest);
         const StencilFaceState& frontStencil = MG_State::pGLContext->GetStencilState(StencilFace::Front);
         const StencilFaceState& backStencil = MG_State::pGLContext->GetStencilState(StencilFace::Back);
-        auto mask = MG_State::pGLContext->GetColorMask();
-        const auto colorWriteMask = static_cast<VkColorComponentFlags>(
-            (mask.r() ? VK_COLOR_COMPONENT_R_BIT : 0u) |
-            (mask.g() ? VK_COLOR_COMPONENT_G_BIT : 0u) |
-            (mask.b() ? VK_COLOR_COMPONENT_B_BIT : 0u) |
-            (mask.a() ? VK_COLOR_COMPONENT_A_BIT : 0u));
+        const VkPolygonMode requestedPolygonMode =
+            MG_Util::ConvertPolygonModeToVkEnum(MG_State::pGLContext->GetPolygonModeFront());
+        // VK_POLYGON_MODE_LINE/_POINT require the fillModeNonSolid device feature; fall back to
+        // VK_POLYGON_MODE_FILL when the device lacks it.
+        const VkPolygonMode effectivePolygonMode =
+            (requestedPolygonMode == VK_POLYGON_MODE_FILL || m_fillModeNonSolidFeatureEnabled)
+                ? requestedPolygonMode
+                : VK_POLYGON_MODE_FILL;
 
         PipelineFactory::PipelineCreatePayload payload {
             .programHash = programObj.hash,
@@ -2980,6 +2982,7 @@ void main() {
             .rasterizationSamples = renderPassEntry.sampleCount,
             .subpass = 0,
             .topology = MG_Util::ConvertPrimitiveModeToVkEnum(mode),
+            .polygonMode = effectivePolygonMode,
             .cullMode = cullFaceEnabled
                 ? MG_Util::ConvertCullFaceModeToVkEnum(MG_State::pGLContext->GetCullFaceMode(), invertClockwise)
                 : VK_CULL_MODE_NONE,
@@ -3075,7 +3078,16 @@ void main() {
             MG_State::pGLContext->GetBlendFuncIndexed(i, srcRGB, dstRGB, srcAlpha, dstAlpha);
             MG_State::pGLContext->GetBlendEquationIndexed(i, colorEquation, alphaEquation);
             const Bool blendEnabled = MG_State::pGLContext->IsCapabilityEnabledIndexed(CapabilityInput::Blend, i);
-            VkColorComponentFlags attachmentColorWriteMask = colorWriteMask;
+            // Per-draw-buffer color write mask (glColorMaski). Divergent per-attachment masks require
+            // the independentBlend device feature; when it is absent, fall back to draw buffer 0's
+            // mask for every attachment (matching the non-indexed glColorMask broadcast).
+            const BoolVec4 bufferMask =
+                MG_State::pGLContext->GetColorMaskIndexed(m_independentBlendFeatureEnabled ? i : 0);
+            VkColorComponentFlags attachmentColorWriteMask = static_cast<VkColorComponentFlags>(
+                (bufferMask.r() ? VK_COLOR_COMPONENT_R_BIT : 0u) |
+                (bufferMask.g() ? VK_COLOR_COMPONENT_G_BIT : 0u) |
+                (bufferMask.b() ? VK_COLOR_COMPONENT_B_BIT : 0u) |
+                (bufferMask.a() ? VK_COLOR_COMPONENT_A_BIT : 0u));
             Bool effectiveBlendEnabled = blendEnabled;
             MG_State::GLState::ITextureObject* colorAttachmentTexture = nullptr;
             if (!isDefaultDrawFbo && i < drawBuffers.size()) {
@@ -6283,6 +6295,9 @@ void main() {
         VkPhysicalDeviceFeatures deviceFeatures{};
         deviceFeatures.geometryShader = supportedDeviceFeatures.geometryShader;
         deviceFeatures.independentBlend = supportedDeviceFeatures.independentBlend;
+        m_independentBlendFeatureEnabled = deviceFeatures.independentBlend == VK_TRUE;
+        deviceFeatures.fillModeNonSolid = supportedDeviceFeatures.fillModeNonSolid;
+        m_fillModeNonSolidFeatureEnabled = deviceFeatures.fillModeNonSolid == VK_TRUE;
         deviceFeatures.logicOp = supportedDeviceFeatures.logicOp;
         deviceFeatures.shaderClipDistance = supportedDeviceFeatures.shaderClipDistance;
         deviceFeatures.shaderCullDistance = supportedDeviceFeatures.shaderCullDistance;

MobileGL/MG_Backend/DirectVulkan/Renderer/VulkanRenderer.h

@@ -342,6 +342,11 @@ namespace MobileGL::MG_Backend::DirectVulkan {
         Bool m_multiDrawIndirectFeatureEnabled = false;
         Bool m_shaderDrawParametersExtensionEnabled = false;
         Bool m_shaderDrawParametersFeatureEnabled = false;
+        // fillModeNonSolid gates VK_POLYGON_MODE_LINE/_POINT (glPolygonMode); independentBlend gates
+        // per-draw-buffer color write masks (glColorMaski). Both are cached at device creation and
+        // drive a runtime fallback when the device lacks them.
+        Bool m_fillModeNonSolidFeatureEnabled = false;
+        Bool m_independentBlendFeatureEnabled = false;
         // Cached at device creation from the graphics queue family properties
         // and device limits; drives timer-query support.
         Uint32 m_timestampValidBits = 0;

MobileGL/MG_Util/Converters/MGToVk/RenderStateEnumConverter.cpp

@@ -31,6 +31,20 @@ namespace MobileGL {
             }
         }
 
+        VkPolygonMode ConvertPolygonModeToVkEnum(GLenum mode) {
+            switch (mode) {
+            case GL_FILL:
+                return VK_POLYGON_MODE_FILL;
+            case GL_LINE:
+                return VK_POLYGON_MODE_LINE;
+            case GL_POINT:
+                return VK_POLYGON_MODE_POINT;
+            default:
+                MGLOG_W("Unrecognized polygon mode");
+                return VK_POLYGON_MODE_FILL;
+            }
+        }
+
         VkCullModeFlags ConvertCullFaceModeToVkEnum(CullFaceMode v, Bool invertClockwise) {
             switch (v) {
             case CullFaceMode::Front:

MobileGL/MG_Util/Converters/MGToVk/RenderStateEnumConverter.h

@@ -13,6 +13,10 @@
 namespace MobileGL {
     namespace MG_Util {
         VkPrimitiveTopology ConvertPrimitiveModeToVkEnum(GLenum mode);
+        // Maps GL_FILL/GL_LINE/GL_POINT to the matching VkPolygonMode. LINE/POINT require the
+        // fillModeNonSolid device feature; the caller is responsible for falling back to FILL when
+        // that feature is unavailable.
+        VkPolygonMode ConvertPolygonModeToVkEnum(GLenum mode);
         VkCullModeFlags ConvertCullFaceModeToVkEnum(CullFaceMode value, Bool invertClockwise = false);
         VkLogicOp ConvertLogicOperationToVkEnum(LogicOperation value);
         VkCompareOp ConvertDepthTestFuncToVkEnum(DepthTestFunc value);