diff --git a/Makefile.am b/Makefile.am
index da6200bb..c7cc579f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -84,6 +84,7 @@ vkd3d_shader_tests = \
 	tests/hlsl/compute.shader_test \
 	tests/hlsl/conditional.shader_test \
 	tests/hlsl/const.shader_test \
+	tests/hlsl/coverage.shader_test \
 	tests/hlsl/cross.shader_test \
 	tests/hlsl/d3dcolor-to-ubyte4.shader_test \
 	tests/hlsl/ddxddy.shader_test \
diff --git a/tests/hlsl/coverage.shader_test b/tests/hlsl/coverage.shader_test
new file mode 100644
index 00000000..ac098761
--- /dev/null
+++ b/tests/hlsl/coverage.shader_test
@@ -0,0 +1,56 @@
+[require]
+shader model >= 5.0
+
+[rtv 0]
+format r32g32b32a32 float
+size (2dms, 4, 640, 480)
+
+[uav 1]
+format r32 uint
+size (2d, 4, 4)
+0   0   0   0
+0   0   0   0
+0   0   0   0
+0   0   0   0
+
+[pixel shader todo]
+RWTexture2D<uint> u : register(u1);
+
+float4 main(float4 position : SV_Position, uint coverage : SV_Coverage) : SV_Target
+{
+    InterlockedOr(u[uint2(position.x, position.y)], coverage);
+    return float4(0.0, 1.0, 0.0, 1.0);
+}
+
+[test]
+sample mask 0x01
+todo draw quad
+probe all rgba (0.0, 0.25, 0.0, 0.25)
+probe uav 1 all rui (0x01)
+sample mask 0x03
+todo draw quad
+probe all rgba (0.0, 0.5, 0.0, 0.5)
+probe uav 1 all rui (0x03)
+sample mask 0x07
+todo draw quad
+probe all rgba (0.0, 0.75, 0.0, 0.75)
+probe uav 1 all rui (0x07)
+
+[uav 1]
+format r32 uint
+size (2d, 4, 4)
+0   0   0   0
+0   0   0   0
+0   0   0   0
+0   0   0   0
+
+[test]
+clear rtv 0 0.0 0.0 0.0 0.0
+sample mask 0x09
+todo draw quad
+probe all rgba (0.0, 0.5, 0.0, 0.5)
+probe uav 1 all rui (0x09)
+sample mask 0x0f
+todo draw quad
+probe all rgba (0.0, 1.0, 0.0, 1.0)
+probe uav 1 all rui (0x0f)
diff --git a/tests/shader_runner.c b/tests/shader_runner.c
index b4b440de..68a7a9c5 100644
--- a/tests/shader_runner.c
+++ b/tests/shader_runner.c
@@ -1231,6 +1231,13 @@ static void parse_test_directive(struct shader_runner *runner, const char *line)
             fatal_error("Unknown uniform type '%s'.\n", line);
         }
     }
+    else if (match_string(line, "sample mask", &line))
+    {
+        unsigned int sample_mask;
+
+        read_uint(&line, &sample_mask, false);
+        runner->sample_mask = sample_mask;
+    }
     else
     {
         fatal_error("Unknown test directive '%s'.\n", line);
diff --git a/tests/shader_runner.h b/tests/shader_runner.h
index 9d41d759..0457db96 100644
--- a/tests/shader_runner.h
+++ b/tests/shader_runner.h
@@ -175,6 +175,8 @@ struct shader_runner
     uint32_t *uniforms;
     size_t uniform_count, uniform_capacity;
 
+    uint32_t sample_mask;
+
     struct resource *resources[MAX_RESOURCES];
     size_t resource_count;
     uint32_t failed_resources[RESOURCE_TYPE_VERTEX_BUFFER + 1][VKD3D_BITMAP_SIZE(MAX_RESOURCES)];
diff --git a/tests/shader_runner_d3d11.c b/tests/shader_runner_d3d11.c
index 9eb8ac4e..e937040f 100644
--- a/tests/shader_runner_d3d11.c
+++ b/tests/shader_runner_d3d11.c
@@ -803,6 +803,8 @@ static bool d3d11_runner_draw(struct shader_runner *r,
 
     ID3D10Blob_Release(vs_code);
 
+    if (r->sample_mask)
+        ID3D11DeviceContext_OMSetBlendState(context, NULL, NULL, r->sample_mask);
     ID3D11DeviceContext_IASetPrimitiveTopology(context, primitive_topology);
     ID3D11DeviceContext_VSSetShader(context, vs, NULL, 0);
     ID3D11DeviceContext_PSSetShader(context, ps, NULL, 0);
diff --git a/tests/shader_runner_d3d12.c b/tests/shader_runner_d3d12.c
index 37780682..593d0759 100644
--- a/tests/shader_runner_d3d12.c
+++ b/tests/shader_runner_d3d12.c
@@ -590,7 +590,7 @@ static bool d3d12_runner_draw(struct shader_runner *r,
     pso_desc.RasterizerState.FillMode = D3D12_FILL_MODE_SOLID;
     pso_desc.RasterizerState.CullMode = D3D12_CULL_MODE_NONE;
     pso_desc.SampleDesc.Count = sample_count;
-    pso_desc.SampleMask = ~(UINT)0;
+    pso_desc.SampleMask = r->sample_mask ? r->sample_mask : ~(UINT)0;
     pso_desc.pRootSignature = test_context->root_signature;
 
     input_element_descs = calloc(runner->r.input_element_count, sizeof(*input_element_descs));
diff --git a/tests/shader_runner_gl.c b/tests/shader_runner_gl.c
index 2649dc55..601307ff 100644
--- a/tests/shader_runner_gl.c
+++ b/tests/shader_runner_gl.c
@@ -1119,6 +1119,8 @@ static bool gl_runner_draw(struct shader_runner *r,
         }
     }
 
+    /* TODO: sample count and mask. */
+
     glViewport(0, 0, RENDER_TARGET_WIDTH, RENDER_TARGET_HEIGHT);
     glScissor(0, 0, RENDER_TARGET_WIDTH, RENDER_TARGET_HEIGHT);
     glDrawBuffers(rt_count, draw_buffers);
diff --git a/tests/shader_runner_vulkan.c b/tests/shader_runner_vulkan.c
index 8c48c107..3d02639f 100644
--- a/tests/shader_runner_vulkan.c
+++ b/tests/shader_runner_vulkan.c
@@ -845,6 +845,7 @@ static VkPipeline create_graphics_pipeline(struct vulkan_shader_runner *runner,
     rs_desc.frontFace = VK_FRONT_FACE_CLOCKWISE;
     rs_desc.lineWidth = 1.0f;
 
+    /* TODO: sample count and mask. */
     ms_desc.rasterizationSamples = VK_SAMPLE_COUNT_1_BIT;
 
     pipeline_desc.stageCount = stage_count;