d3d10core/tests: Add depth bias clamp tests.

dlls/d3d10core/tests/d3d10core.c

@@ -14975,6 +14975,15 @@ static void test_stream_output_vs(void)
     release_test_context(&test_context);
 }
 
+static float clamp_depth_bias(float bias, float clamp)
+{
+    if (clamp > 0.0f)
+        return min(bias, clamp);
+    if (clamp < 0.0f)
+        return max(bias, clamp);
+    return bias;
+}
+
 static void test_depth_bias(void)
 {
     struct vec3 vertices[] =
@@ -14988,14 +14997,14 @@ static void test_depth_bias(void)
     D3D10_RASTERIZER_DESC rasterizer_desc;
     struct swapchain_desc swapchain_desc;
     D3D10_TEXTURE2D_DESC texture_desc;
-    double m, r, bias, depth, data;
+    double m, bias, depth, data;
     struct resource_readback rb;
     ID3D10DepthStencilView *dsv;
     unsigned int expected_value;
+    unsigned int x, y, i, j, k;
     ID3D10RasterizerState *rs;
     ID3D10Texture2D *texture;
     unsigned int format_idx;
-    unsigned int x, y, i, j;
     unsigned int shift = 0;
     ID3D10Device *device;
     float *depth_values;
@@ -15022,6 +15031,10 @@ static void test_depth_bias(void)
         -10000, -1000, -100, -10, -9, -8, -7, -6, -5, -4, -3, -2, -1,
         1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 50, 100, 200, 500, 1000, 10000,
     };
+    static const float bias_clamp_tests[] =
+    {
+        0.0f, -1e-5f, 1e-5f,
+    };
     static const float quad_slopes[] =
     {
         0.0f, 0.5f, 1.0f
@@ -15114,6 +15127,10 @@ static void test_depth_bias(void)
             for (j = 0; j < ARRAY_SIZE(bias_tests); ++j)
             {
                 rasterizer_desc.DepthBias = bias_tests[j];
+
+                for (k = 0; k < ARRAY_SIZE(bias_clamp_tests); ++k)
+                {
+                    rasterizer_desc.DepthBiasClamp = bias_clamp_tests[k];
                     ID3D10Device_CreateRasterizerState(device, &rasterizer_desc, &rs);
                     ok(SUCCEEDED(hr), "Failed to create rasterizer state, hr %#x.\n", hr);
                     ID3D10Device_RSSetState(device, rs);
@@ -15123,13 +15140,14 @@ static void test_depth_bias(void)
                     {
                         case DXGI_FORMAT_D32_FLOAT:
                             bias = rasterizer_desc.DepthBias * pow(2.0f, quads[i].exponent - 23.0f);
+                            bias = clamp_depth_bias(bias, rasterizer_desc.DepthBiasClamp);
                             depth = min(max(0.0f, quads[i].z + bias), 1.0f);
 
                             check_texture_float(texture, depth, 2);
                             break;
                         case DXGI_FORMAT_D24_UNORM_S8_UINT:
-                        r = 1.0f / 16777215.0f;
-                        bias = rasterizer_desc.DepthBias * r;
+                            bias = clamp_depth_bias(rasterizer_desc.DepthBias / 16777215.0f,
+                                    rasterizer_desc.DepthBiasClamp);
                             depth = min(max(0.0f, quads[i].z + bias), 1.0f);
 
                             get_texture_readback(texture, 0, &rb);
@@ -15149,8 +15167,8 @@ static void test_depth_bias(void)
                             release_resource_readback(&rb);
                             break;
                         case DXGI_FORMAT_D16_UNORM:
-                        r = 1.0f / 65535.0f;
-                        bias = rasterizer_desc.DepthBias * r;
+                            bias = clamp_depth_bias(rasterizer_desc.DepthBias / 65535.0f,
+                                    rasterizer_desc.DepthBiasClamp);
                             depth = min(max(0.0f, quads[i].z + bias), 1.0f);
 
                             get_texture_readback(texture, 0, &rb);
@@ -15173,6 +15191,7 @@ static void test_depth_bias(void)
                     ID3D10RasterizerState_Release(rs);
                 }
             }
+        }
 
         /* SlopeScaledDepthBias */
         rasterizer_desc.DepthBias = 0;
@@ -15212,6 +15231,10 @@ static void test_depth_bias(void)
             for (j = 0; j < ARRAY_SIZE(slope_scaled_bias_tests); ++j)
             {
                 rasterizer_desc.SlopeScaledDepthBias = slope_scaled_bias_tests[j];
+
+                for (k = 0; k < ARRAY_SIZE(bias_clamp_tests); ++k)
+                {
+                    rasterizer_desc.DepthBiasClamp = bias_clamp_tests[k];
                     ID3D10Device_CreateRasterizerState(device, &rasterizer_desc, &rs);
                     ok(SUCCEEDED(hr), "Failed to create rasterizer state, hr %#x.\n", hr);
                     ID3D10Device_RSSetState(device, rs);
@@ -15219,7 +15242,7 @@ static void test_depth_bias(void)
                     draw_quad(&test_context);
 
                     m = quad_slopes[i] / texture_desc.Height;
-                bias = rasterizer_desc.SlopeScaledDepthBias * m;
+                    bias = clamp_depth_bias(rasterizer_desc.SlopeScaledDepthBias * m, rasterizer_desc.DepthBiasClamp);
                     get_texture_readback(texture, 0, &rb);
                     for (y = 0; y < texture_desc.Height; ++y)
                     {
@@ -15255,6 +15278,7 @@ static void test_depth_bias(void)
                     ID3D10RasterizerState_Release(rs);
                 }
             }
+        }
 
         ID3D10Texture2D_Release(texture);
         ID3D10DepthStencilView_Release(dsv);