Merge pull request #963 from Unity-Technologies/Fix-material-debug-mode

Fix material debug mode

ScriptableRenderPipeline/HDRenderPipeline/HDRP/HDRenderPipeline.cs

                 {
                     // We render first the opaque object as opaque alpha tested are more costly to render and could be reject by early-z (but not Hi-z as it is disable with clip instruction)
                     // This is handled automatically with the RenderQueue value (OpaqueAlphaTested have a different value and thus are sorted after Opaque)
-                    RenderOpaqueRenderList(cull, camera, renderContext, cmd, m_DepthOnlyAndDepthForwardOnlyPassNames, 0, HDRenderQueue.k_RenderQueue_AllOpaque, m_DepthStateOpaque);
+                    RenderOpaqueRenderList(cull, camera, renderContext, cmd, m_DepthOnlyAndDepthForwardOnlyPassNames, 0, HDRenderQueue.k_RenderQueue_AllOpaque);
-                    RenderOpaqueRenderList(cull, camera, renderContext, cmd, m_DepthForwardOnlyPassNames, 0, HDRenderQueue.k_RenderQueue_AllOpaque, m_DepthStateOpaque);
+                    RenderOpaqueRenderList(cull, camera, renderContext, cmd, m_DepthForwardOnlyPassNames, 0, HDRenderQueue.k_RenderQueue_AllOpaque);
-                        RenderOpaqueRenderList(cull, camera, renderContext, cmd, m_DepthOnlyPassNames, 0, renderQueueRange, m_DepthStateOpaque);
+                        RenderOpaqueRenderList(cull, camera, renderContext, cmd, m_DepthOnlyPassNames, 0, renderQueueRange);
                     }
                 }
             }
                 }
                 else
                 {
+                    // When rendering debug material we shouldn't rely on a depth prepass for optimizing the alpha clip test. As it is control on the material inspector side
+                    // we must override the state here.
+
-                    RenderOpaqueRenderList(cull, hdCamera.camera, renderContext, cmd, m_AllForwardOpaquePassNames, m_currentRendererConfigurationBakedLighting);
+                    RenderOpaqueRenderList(cull, hdCamera.camera, renderContext, cmd, m_AllForwardOpaquePassNames, m_currentRendererConfigurationBakedLighting, stateBlock: m_DepthStateOpaque);
-                    RenderTransparentRenderList(cull, hdCamera.camera, renderContext, cmd, m_AllTransparentPassNames, m_currentRendererConfigurationBakedLighting);
+                    RenderTransparentRenderList(cull, hdCamera.camera, renderContext, cmd, m_AllTransparentPassNames, m_currentRendererConfigurationBakedLighting, stateBlock: m_DepthStateOpaque);
                 }
             }