Vulkan: support depth offset.

src/libANGLE/renderer/vulkan/ContextVk.cpp

@@ -553,8 +553,10 @@ gl::Error ContextVk::syncState(const gl::Context *context, const gl::State::Dirt
                                                isViewportFlipEnabledForDrawFBO());
                 break;
             case gl::State::DIRTY_BIT_POLYGON_OFFSET_FILL_ENABLED:
+                mPipelineDesc->updatePolygonOffsetFillEnabled(glState.isPolygonOffsetFillEnabled());
                 break;
             case gl::State::DIRTY_BIT_POLYGON_OFFSET:
+                mPipelineDesc->updatePolygonOffset(glState.getRasterizerState());
                 break;
             case gl::State::DIRTY_BIT_RASTERIZER_DISCARD_ENABLED:
                 break;

src/libANGLE/renderer/vulkan/vk_cache_utils.cpp

@@ -828,6 +828,17 @@ void PipelineDesc::updateStencilBackWriteMask(const gl::DepthStencilState &depth
         drawFramebuffer->hasStencil() ? depthStencilState.stencilBackWritemask : 0);
 }
 
+void PipelineDesc::updatePolygonOffsetFillEnabled(bool enabled)
+{
+    mRasterizationStateInfo.depthBiasEnable = enabled;
+}
+
+void PipelineDesc::updatePolygonOffset(const gl::RasterizerState &rasterState)
+{
+    mRasterizationStateInfo.depthBiasSlopeFactor    = rasterState.polygonOffsetFactor;
+    mRasterizationStateInfo.depthBiasConstantFactor = rasterState.polygonOffsetUnits;
+}
+
 void PipelineDesc::updateRenderPassDesc(const RenderPassDesc &renderPassDesc)
 {
     mRenderPassDesc = renderPassDesc;

src/libANGLE/renderer/vulkan/vk_cache_utils.h

@@ -408,6 +408,10 @@ class PipelineDesc final
     void updateStencilBackWriteMask(const gl::DepthStencilState &depthStencilState,
                                     const gl::Framebuffer *drawFramebuffer);
 
+    // Depth offset.
+    void updatePolygonOffsetFillEnabled(bool enabled);
+    void updatePolygonOffset(const gl::RasterizerState &rasterState);
+
   private:
     // TODO(jmadill): Use gl::ShaderMap when we can pack into fewer bits. http://anglebug.com/2522
     ShaderStageInfo mShaderStageInfo;

src/tests/deqp_support/deqp_gles2_test_expectations.txt

@@ -233,7 +233,6 @@
 2598 VULKAN : dEQP-GLES2.functional.rasterization.primitives.line* = SKIP
 2599 VULKAN : dEQP-GLES2.functional.rasterization.limits.points = SKIP
 2601 VULKAN : dEQP-GLES2.functional.clipping.* = SKIP
-2353 VULKAN : dEQP-GLES2.functional.polygon_offset.* = SKIP
 
 // Vulkan AMD Windows specific failures
 2602 VULKAN WIN AMD : dEQP-GLES2.functional.buffer.write.* = SKIP