diff --git a/patches/patchinstall.sh b/patches/patchinstall.sh
index 39f68abe..77d8d811 100755
--- a/patches/patchinstall.sh
+++ b/patches/patchinstall.sh
@@ -437,6 +437,7 @@ patch_enable_all ()
 	enable_wined3d_WINED3DFMT_R32G32_UINT="$1"
 	enable_wined3d_buffer_create="$1"
 	enable_wined3d_buffer_sync_apple="$1"
+	enable_wined3d_sample_c_lz="$1"
 	enable_wined3d_wined3d_guess_gl_vendor="$1"
 	enable_winedbg_Process_Arguments="$1"
 	enable_winedevice_Default_Drivers="$1"
@@ -1554,6 +1555,9 @@ patch_enable ()
 		wined3d-buffer_sync_apple)
 			enable_wined3d_buffer_sync_apple="$2"
 			;;
+		wined3d-sample_c_lz)
+			enable_wined3d_sample_c_lz="$2"
+			;;
 		wined3d-wined3d_guess_gl_vendor)
 			enable_wined3d_wined3d_guess_gl_vendor="$2"
 			;;
@@ -9091,6 +9095,21 @@ if test "$enable_wined3d_buffer_sync_apple" -eq 1; then
 	) >> "$patchlist"
 fi
 
+# Patchset wined3d-sample_c_lz
+# |
+# | This patchset fixes the following Wine bugs:
+# |   *	[#42863] Emulate sample_c_lz using textureGradOffset for sampler2DArrayShadow
+# |
+# | Modified files:
+# |   *	dlls/wined3d/glsl_shader.c
+# |
+if test "$enable_wined3d_sample_c_lz" -eq 1; then
+	patch_apply wined3d-sample_c_lz/0001-wined3d-Emulate-sample_c_lz-using-textureGradOffset-.patch
+	(
+		printf '%s\n' '+    { "Michael Müller", "wined3d: Emulate sample_c_lz using textureGradOffset for sampler2DArrayShadow.", 1 },';
+	) >> "$patchlist"
+fi
+
 # Patchset wined3d-wined3d_guess_gl_vendor
 # |
 # | This patchset fixes the following Wine bugs:
diff --git a/patches/wined3d-sample_c_lz/0001-wined3d-Emulate-sample_c_lz-using-textureGradOffset-.patch b/patches/wined3d-sample_c_lz/0001-wined3d-Emulate-sample_c_lz-using-textureGradOffset-.patch
new file mode 100644
index 00000000..51172fda
--- /dev/null
+++ b/patches/wined3d-sample_c_lz/0001-wined3d-Emulate-sample_c_lz-using-textureGradOffset-.patch
@@ -0,0 +1,66 @@
+From a48ac71b79ca398816a306e1fb455a773de17e45 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Michael=20M=C3=BCller?= <michael@fds-team.de>
+Date: Sun, 25 Jun 2017 04:13:57 +0200
+Subject: wined3d: Emulate sample_c_lz using textureGradOffset for
+ sampler2DArrayShadow.
+
+---
+ dlls/wined3d/glsl_shader.c | 21 +++++++++++++++++++++
+ 1 file changed, 21 insertions(+)
+
+diff --git a/dlls/wined3d/glsl_shader.c b/dlls/wined3d/glsl_shader.c
+index b813cf3aaf8..82cca841475 100644
+--- a/dlls/wined3d/glsl_shader.c
++++ b/dlls/wined3d/glsl_shader.c
+@@ -91,6 +91,7 @@ struct glsl_sample_function
+     enum wined3d_data_type data_type;
+     BOOL output_single_component;
+     unsigned int offset_size;
++    BOOL emulate_lod;
+ };
+ 
+ enum heap_node_op
+@@ -3439,6 +3440,18 @@ static void shader_glsl_get_sample_function(const struct wined3d_shader_context
+     if (resource_type == WINED3D_SHADER_RESOURCE_TEXTURE_CUBE)
+         projected = FALSE;
+ 
++    /* emulate textureLod(sampler2DArrayShadow, ...) using textureGradOffset */
++    if (shadow && lod && resource_type == WINED3D_SHADER_RESOURCE_TEXTURE_2DARRAY)
++    {
++        sample_function->emulate_lod = TRUE;
++        grad = offset = TRUE;
++        lod = FALSE;
++    }
++    else
++    {
++        sample_function->emulate_lod = FALSE;
++    }
++
+     if (needs_legacy_glsl_syntax(gl_info))
+     {
+         if (shadow)
+@@ -3600,6 +3613,7 @@ static void PRINTF_ATTR(9, 10) shader_glsl_gen_sample_code(const struct wined3d_
+         const char *dx, const char *dy, const char *bias, const struct wined3d_shader_texel_offset *offset,
+         const char *coord_reg_fmt, ...)
+ {
++    static const struct wined3d_shader_texel_offset dummy_offset = {0, 0, 0};
+     const struct wined3d_shader_version *version = &ins->ctx->reg_maps->shader_version;
+     char dst_swizzle[6];
+     struct color_fixup_desc fixup;
+@@ -3668,6 +3682,13 @@ static void PRINTF_ATTR(9, 10) shader_glsl_gen_sample_code(const struct wined3d_
+                 break;
+         }
+     }
++    if (sample_function->emulate_lod)
++    {
++        if (strcmp(bias, "0")) FIXME("Don't know how to emulate lod level %s\n", bias);
++        if (!dx) dx = "vec2(0.0, 0.0)";
++        if (!dy) dy = "vec2(0.0, 0.0)";
++        if (!offset) offset = &dummy_offset;
++    }
+     if (dx && dy)
+         shader_addline(ins->ctx->buffer, ", %s, %s", dx, dy);
+     else if (bias)
+-- 
+2.13.1
+
diff --git a/patches/wined3d-sample_c_lz/definition b/patches/wined3d-sample_c_lz/definition
new file mode 100644
index 00000000..e946a496
--- /dev/null
+++ b/patches/wined3d-sample_c_lz/definition
@@ -0,0 +1 @@
+Fixes: [42863] Emulate sample_c_lz using textureGradOffset for sampler2DArrayShadow