[PATCH v4 0/2] MR7324: Use Microsoft provided coefficients for YUV to RGB conversion.

[Brendan McGrath (＠redmcg)]

The current YUV to RGB conversion provides values in studio-range [16-235], but full-range is required [0-255]. As a result, we currently write the value of 16 to represent black, and so we get gray instead.

This MR changes the coefficients used in the conversion so that the resultant output is in full-range. It actually uses two sets of coefficients as these differ between SD and HD.

Also included is a number of Direct Draw 7 tests.

The coefficients used are documented here:
https://learn.microsoft.com/en-us/windows/win32/medfound/recommended-8-bit-y...

--
  v4: wined3d: Use Microsoft provided coefficients for YUV to RGB conversion.
      ddraw/tests: Test yuv to rgb blt in ddraw7.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/7324

[PATCH v4 1/2] ddraw/tests: Test yuv to rgb blt in ddraw7.

[Brendan McGrath]

From: Brendan McGrath <bmcgrath(a)codeweavers.com>

---
 dlls/ddraw/tests/ddraw7.c | 433 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 433 insertions(+)

diff --git a/dlls/ddraw/tests/ddraw7.c b/dlls/ddraw/tests/ddraw7.c
index e7d66278ad7..b05f4e8c49e 100644
--- a/dlls/ddraw/tests/ddraw7.c
+++ b/dlls/ddraw/tests/ddraw7.c
@@ -13652,6 +13652,438 @@ static void test_blt(void)
     DestroyWindow(window);
 }
 
+static void test_yuv_to_rgb_blt(void)
+{
+    IDirectDrawSurface7 *rgb_surface, *yuv_surface;
+    DWORD flags, chroma_pitch, chroma_height;
+    DDSURFACEDESC2 surface_desc, lock_desc;
+    unsigned int i, j, x, y;
+    IDirectDraw7 *ddraw;
+    ULONG refcount;
+    UINT32 *pixel;
+    HWND window;
+    HRESULT hr;
+    BYTE *ptr;
+
+    static const struct
+    {
+        const char *name;
+        DWORD fourCC;
+        BYTE h_subsampling;
+        BYTE v_subsampling;
+        BYTE u_plane;
+        BYTE v_plane;
+        BYTE y_offset;
+        BYTE u_offset;
+        BYTE v_offset;
+        BYTE y_increment;
+        BYTE u_increment;
+        BYTE v_increment;
+    }
+    test_textures[] =
+    {
+        {"UYVY", MAKEFOURCC('U', 'Y', 'V', 'Y'), 2, 1, 0, 0, 1, 0, 2, 2, 4, 4},
+        {"YUY2", MAKEFOURCC('Y', 'U', 'Y', '2'), 2, 1, 0, 0, 0, 1, 3, 2, 4, 4},
+        {"NV12", MAKEFOURCC('N', 'V', '1', '2'), 2, 2, 1, 1, 0, 0, 1, 1, 2, 2},
+        {"YV12", MAKEFOURCC('Y', 'V', '1', '2'), 2, 2, 2, 1, 0, 0, 0, 1, 1, 1},
+    };
+
+    static const struct
+    {
+        const char *name;
+        DWORD height;
+        BYTE y;
+        BYTE u;
+        BYTE v;
+        UINT32 expected;
+        BOOL todo;
+        /* some systems are configured for studio range */
+        UINT32 studio_value;
+        /* some systems use SD values for HD. */
+        BOOL test_for_broken;
+        UINT32 broken_value;
+    }
+    test_colors[] =
+    {
+        {
+            .name = "black SD",
+            .height = 576,
+            .y = 0x10,
+            .u = 0x80,
+            .v = 0x80,
+            .expected = 0x000000,
+            .todo = TRUE,
+            .studio_value = 0x101010,
+        },
+
+        {
+            .name = "white SD",
+            .height = 576,
+            .y = 0xeb,
+            .u = 0x80,
+            .v = 0x80,
+            .expected = 0xffffff,
+            .todo = TRUE,
+            .studio_value = 0xebebeb,
+        },
+
+        {
+            .name = "red SD",
+            .height = 576,
+            .y = 0x51,
+            .u = 0x5a,
+            .v = 0xf0,
+            .expected = 0xfe0000,
+            .todo = TRUE,
+            .studio_value = 0xeb1010,
+        },
+
+        {
+            .name = "green SD",
+            .height = 576,
+            .y = 0x91,
+            .u = 0x36,
+            .v = 0x22,
+            .expected = 0x00ff01,
+            .todo = TRUE,
+            .studio_value = 0x10eb11,
+        },
+
+        {
+            .name = "blue SD",
+            .height = 576,
+            .y = 0x29,
+            .u = 0xf0,
+            .v = 0x6e,
+            .expected = 0x0000ff,
+            .todo = TRUE,
+            .studio_value = 0x1010eb,
+        },
+
+        {
+            .name = "gray SD",
+            .height = 576,
+            .y = 0x7e,
+            .u = 0x80,
+            .v = 0x80,
+            .expected = 0x808080,
+            .todo = TRUE,
+            .studio_value = 0x7e7e7e,
+        },
+
+        {
+            .name = "past black SD",
+            .height = 576,
+            .y = 0x00,
+            .u = 0x80,
+            .v = 0x80,
+            .expected = 0x000000,
+            .todo = FALSE,
+            .studio_value = 0x101010,
+        },
+
+        {
+            .name = "past white SD",
+            .height = 576,
+            .y = 0xff,
+            .u = 0x80,
+            .v = 0x80,
+            .expected = 0xffffff,
+            .todo = FALSE,
+            .studio_value = 0xebebeb,
+        },
+
+        {
+            .name = "zeros SD",
+            .height = 576,
+            .y = 0x00,
+            .u = 0x00,
+            .v = 0x00,
+            .expected = 0x008700,
+            .todo = FALSE,
+            .studio_value = 0x108410,
+        },
+        /* Windows will treat anything with a height greater than 576 as HD and,
+         * as per ITU-R Recommendation BT.709
+            . = change the color scheme */
+        {
+            .name = "black HD",
+            .height = 580,
+            .y = 0x10,
+            .u = 0x80,
+            .v = 0x80,
+            .expected = 0x000000,
+            .todo = TRUE,
+            .studio_value = 0x101010,
+        },
+
+        {
+            .name = "white HD",
+            .height = 580,
+            .y = 0xeb,
+            .u = 0x80,
+            .v = 0x80,
+            .expected = 0xffffff,
+            .todo = TRUE,
+            .studio_value = 0xebebeb,
+        },
+
+        {
+            .name = "red HD",
+            .height = 580,
+            .y = 0x3f,
+            .u = 0x66,
+            .v = 0xf0,
+            .expected = 0xff0100,
+            .todo = TRUE,
+            .studio_value = 0xeb1110,
+            .test_for_broken = TRUE,
+            .broken_value = 0xe90002,
+        },
+
+        {
+            .name = "green HD",
+            .height = 580,
+            .y = 0xad,
+            .u = 0x2a,
+            .v = 0x1a,
+            .expected = 0x00ff01,
+            .todo = TRUE,
+            .studio_value = 0x10eb11,
+            .test_for_broken = TRUE,
+            .broken_value = 0x14ff09,
+        },
+
+        {
+            .name = "blue HD",
+            .height = 580,
+            .y = 0x20,
+            .u = 0xf0,
+            .v = 0x76,
+            .expected = 0x0100ff,
+            .todo = TRUE,
+            .studio_value = 0x1110eb,
+            .test_for_broken = TRUE,
+            .broken_value = 0x0300f5,
+        },
+
+        {
+            .name = "gray HD",
+            .height = 580,
+            .y = 0x7e,
+            .u = 0x80,
+            .v = 0x80,
+            .expected = 0x808080,
+            .todo = TRUE,
+            .studio_value = 0x7e7e7e,
+        },
+
+        {
+            .name = "past black HD",
+            .height = 580,
+            .y = 0x00,
+            .u = 0x80,
+            .v = 0x80,
+            .expected = 0x000000,
+            .todo = FALSE,
+            .studio_value = 0x101010,
+        },
+
+        {
+            .name = "past white HD",
+            .height = 580,
+            .y = 0xff,
+            .u = 0x80,
+            .v = 0x80,
+            .expected = 0xffffff,
+            .todo = FALSE,
+            .studio_value = 0xebebeb,
+        },
+
+        {
+            .name = "zeros HD",
+            .height = 580,
+            .y = 0x00,
+            .u = 0x00,
+            .v = 0x00,
+            .expected = 0x004d00,
+            .todo = TRUE,
+            .studio_value = 0x105210,
+            .test_for_broken = TRUE,
+            .broken_value = 0x008700,
+        },
+    };
+
+    window = create_window();
+    if (!(ddraw = create_ddraw()))
+    {
+        skip("Failed to create a 3D device, skipping test.\n");
+        DestroyWindow(window);
+        return;
+    }
+
+    hr = IDirectDraw7_SetCooperativeLevel(ddraw, window, DDSCL_NORMAL);
+    ok(hr == S_OK, "Failed to set cooperative level, hr %#lx.\n", hr);
+
+    memset(&surface_desc, 0, sizeof(surface_desc));
+    surface_desc.dwSize = sizeof(surface_desc);
+    surface_desc.dwFlags = DDSD_WIDTH | DDSD_HEIGHT | DDSD_CAPS | DDSD_PIXELFORMAT;
+    surface_desc.dwWidth = 720;
+    surface_desc.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN;
+    surface_desc.ddpfPixelFormat.dwSize = sizeof(surface_desc.ddpfPixelFormat);
+    surface_desc.ddpfPixelFormat.dwRGBBitCount = 32;
+    surface_desc.ddpfPixelFormat.dwRBitMask = 0xff0000;
+    surface_desc.ddpfPixelFormat.dwGBitMask = 0xff00;
+    surface_desc.ddpfPixelFormat.dwBBitMask = 0xff;
+    surface_desc.ddpfPixelFormat.dwRGBAlphaBitMask = 0;
+
+    flags = DDSD_HEIGHT | DDSD_PITCH | DDSD_PIXELFORMAT | DDSD_WIDTH;
+
+    memset(&lock_desc, 0, sizeof(lock_desc));
+    lock_desc.dwSize = sizeof(lock_desc);
+
+    yuv_surface = NULL;
+
+    for (i = 0; i < ARRAY_SIZE(test_textures); ++i)
+    {
+        winetest_push_context("%s format", test_textures[i].name);
+
+        surface_desc.ddpfPixelFormat.dwFourCC = test_textures[i].fourCC;
+
+        for (j = 0; j < ARRAY_SIZE(test_colors); j++)
+        {
+            winetest_push_context("color %s", test_colors[j].name);
+
+            if (!yuv_surface)
+            {
+                surface_desc.dwHeight = test_colors[j].height;
+                surface_desc.ddpfPixelFormat.dwFlags = DDPF_FOURCC;
+                hr = IDirectDraw7_CreateSurface(ddraw, &surface_desc, &yuv_surface, NULL);
+                if (hr != S_OK)
+                {
+                    skip("Failed to create yuv surface, hr %#lx.\n", hr);
+                    winetest_pop_context();
+                    break;
+                }
+
+                surface_desc.ddpfPixelFormat.dwFlags = DDPF_RGB;
+                hr = IDirectDraw7_CreateSurface(ddraw, &surface_desc, &rgb_surface, NULL);
+                ok(hr == S_OK, "Failed to create rgb surface, hr %#lx.\n", hr);
+            }
+
+            hr = IDirectDrawSurface7_Lock(yuv_surface, NULL, &lock_desc, DDLOCK_WRITEONLY | DDLOCK_WAIT | DDLOCK_SURFACEMEMORYPTR, NULL);
+            ok(hr == S_OK, "Got unexpected hr %#lx, expected S_OK.\n", hr);
+            ok((lock_desc.dwFlags & flags) == flags, "Got unexpected flags %#lx, expected %#lx.\n",
+                    lock_desc.dwFlags, flags);
+            ok(lock_desc.ddpfPixelFormat.dwFlags == DDPF_FOURCC,
+                    "Got unexpected pixel format flags %#lx, expected DDPF_FOURCC.\n",
+                    lock_desc.ddpfPixelFormat.dwFlags);
+            ok(lock_desc.ddpfPixelFormat.dwFourCC == test_textures[i].fourCC,
+                    "Got unexpected pixel format %#lx, expected %#lx.\n",
+                    lock_desc.ddpfPixelFormat.dwFourCC, test_textures[i].fourCC);
+
+            ptr = (BYTE*)lock_desc.lpSurface + test_textures[i].y_offset;
+
+            for (y = 0; y < lock_desc.dwHeight; y++)
+            {
+                for (x = 0; x < lock_desc.lPitch / test_textures[i].y_increment; x++)
+                {
+                    *ptr = test_colors[j].y;
+                    ptr += test_textures[i].y_increment;
+                }
+            }
+
+            chroma_pitch = lock_desc.lPitch / (test_textures[i].h_subsampling * test_textures[i].y_increment);
+            chroma_height = lock_desc.dwHeight / test_textures[i].v_subsampling;
+
+            ptr = (BYTE*)lock_desc.lpSurface + test_textures[i].u_offset;
+
+            if (test_textures[i].u_plane)
+            {
+                ptr += lock_desc.lPitch * lock_desc.dwHeight;
+                ptr += chroma_pitch * chroma_height * (test_textures[i].u_plane - 1);
+            }
+
+            for (y = 0; y < chroma_height; y++)
+            {
+                for (x = 0; x < chroma_pitch; x++)
+                {
+                    *ptr = test_colors[j].u;
+                    ptr += test_textures[i].u_increment;
+                }
+            }
+
+            ptr = (BYTE*)lock_desc.lpSurface + test_textures[i].v_offset;
+            if (test_textures[i].v_plane)
+            {
+                ptr += lock_desc.lPitch * lock_desc.dwHeight;
+                ptr += chroma_pitch * chroma_height * (test_textures[i].v_plane - 1);
+            }
+
+            for (y = 0; y < chroma_height; y++)
+            {
+                for (x = 0; x < chroma_pitch; x++)
+                {
+                    *ptr = test_colors[j].v;
+                    ptr += test_textures[i].v_increment;
+                }
+            }
+
+            hr = IDirectDrawSurface7_Unlock(yuv_surface, NULL);
+            ok(hr == S_OK, "Got unexpected hr %#lx, expected S_OK.\n", hr);
+
+            hr = IDirectDrawSurface7_Blt(rgb_surface, NULL, yuv_surface, NULL, DDBLT_WAIT, NULL);
+            ok(hr == S_OK, "Got unexpected hr %#lx, expected S_OK.\n", hr);
+            if (hr != S_OK)
+            {
+                skip("Failed to blt to RGB surface");
+                winetest_pop_context();
+                continue;
+            }
+
+            hr = IDirectDrawSurface7_Lock(rgb_surface, NULL, &lock_desc, DDLOCK_READONLY | DDLOCK_WAIT | DDLOCK_SURFACEMEMORYPTR, NULL);
+            ok(hr == S_OK, "Got unexpected hr %#lx, expected S_OK.\n", hr);
+            ok((lock_desc.dwFlags & flags) == flags, "Got unexpected flags %#lx, expected %#lx.\n", lock_desc.dwFlags, flags);
+            ok(lock_desc.ddpfPixelFormat.dwFlags == DDPF_RGB, "Got unexpected pixel format flags %#lx, expected DDPF_RGB.\n",
+                    lock_desc.ddpfPixelFormat.dwFlags);
+
+            /* check the top left 4x4 pixels */
+            for (y = 0; y < 4; y++)
+            {
+                pixel = (UINT32*)((BYTE*)lock_desc.lpSurface + lock_desc.lPitch * y);
+                for (x = 0; x < 4; x++)
+                {
+                    UINT32 color = pixel[x] & 0xffffff;
+                    todo_wine_if(test_colors[j].todo)
+                    ok(compare_color(color, test_colors[j].expected, 1) ||
+                            broken(compare_color(color, test_colors[j].expected, 4)) ||
+                            broken(compare_color(color, test_colors[j].studio_value, 0x10)) ||
+                            broken(test_colors[j].test_for_broken && compare_color(color, test_colors[j].broken_value, 4)),
+                            "Got unexpected value at (%d,%d). Got %#lx, expected %#lx.\n",
+                            x, y, (long unsigned)color, (long unsigned)test_colors[j].expected);
+                }
+            }
+
+            hr = IDirectDrawSurface7_Unlock(rgb_surface, NULL);
+            ok(hr == S_OK, "Got unexpected hr %#lx, expected S_OK.\n", hr);
+
+            if (j + 1 == ARRAY_SIZE(test_colors) || test_colors[j].height != test_colors[j+1].height)
+            {
+                IDirectDrawSurface7_Release(yuv_surface);
+                IDirectDrawSurface7_Release(rgb_surface);
+                yuv_surface = NULL;
+            }
+            winetest_pop_context();
+        }
+
+        winetest_pop_context();
+    }
+
+    refcount = IDirectDraw7_Release(ddraw);
+    ok(!refcount, "DirectDraw7 has %lu references left.\n", refcount);
+    DestroyWindow(window);
+}
+
 static void test_blt_z_alpha(void)
 {
     DWORD blt_flags[] =
@@ -20609,6 +21041,7 @@ START_TEST(ddraw7)
     test_offscreen_overlay();
     test_overlay_rect();
     test_blt();
+    test_yuv_to_rgb_blt();
     test_blt_z_alpha();
     test_cross_device_blt();
     test_color_clamping();
-- 
GitLab


https://gitlab.winehq.org/wine/wine/-/merge_requests/7324

[PATCH v4 2/2] wined3d: Use Microsoft provided coefficients for YUV to RGB conversion.

[Brendan McGrath]

From: Brendan McGrath <bmcgrath(a)codeweavers.com>

---
 dlls/ddraw/tests/ddraw7.c  | 20 --------------------
 dlls/wined3d/glsl_shader.c | 23 +++++++++++++++++------
 2 files changed, 17 insertions(+), 26 deletions(-)

diff --git a/dlls/ddraw/tests/ddraw7.c b/dlls/ddraw/tests/ddraw7.c
index b05f4e8c49e..42f0d6e8eaf 100644
--- a/dlls/ddraw/tests/ddraw7.c
+++ b/dlls/ddraw/tests/ddraw7.c
@@ -13696,7 +13696,6 @@ static void test_yuv_to_rgb_blt(void)
         BYTE u;
         BYTE v;
         UINT32 expected;
-        BOOL todo;
         /* some systems are configured for studio range */
         UINT32 studio_value;
         /* some systems use SD values for HD. */
@@ -13712,7 +13711,6 @@ static void test_yuv_to_rgb_blt(void)
             .u = 0x80,
             .v = 0x80,
             .expected = 0x000000,
-            .todo = TRUE,
             .studio_value = 0x101010,
         },
 
@@ -13723,7 +13721,6 @@ static void test_yuv_to_rgb_blt(void)
             .u = 0x80,
             .v = 0x80,
             .expected = 0xffffff,
-            .todo = TRUE,
             .studio_value = 0xebebeb,
         },
 
@@ -13734,7 +13731,6 @@ static void test_yuv_to_rgb_blt(void)
             .u = 0x5a,
             .v = 0xf0,
             .expected = 0xfe0000,
-            .todo = TRUE,
             .studio_value = 0xeb1010,
         },
 
@@ -13745,7 +13741,6 @@ static void test_yuv_to_rgb_blt(void)
             .u = 0x36,
             .v = 0x22,
             .expected = 0x00ff01,
-            .todo = TRUE,
             .studio_value = 0x10eb11,
         },
 
@@ -13756,7 +13751,6 @@ static void test_yuv_to_rgb_blt(void)
             .u = 0xf0,
             .v = 0x6e,
             .expected = 0x0000ff,
-            .todo = TRUE,
             .studio_value = 0x1010eb,
         },
 
@@ -13767,7 +13761,6 @@ static void test_yuv_to_rgb_blt(void)
             .u = 0x80,
             .v = 0x80,
             .expected = 0x808080,
-            .todo = TRUE,
             .studio_value = 0x7e7e7e,
         },
 
@@ -13778,7 +13771,6 @@ static void test_yuv_to_rgb_blt(void)
             .u = 0x80,
             .v = 0x80,
             .expected = 0x000000,
-            .todo = FALSE,
             .studio_value = 0x101010,
         },
 
@@ -13789,7 +13781,6 @@ static void test_yuv_to_rgb_blt(void)
             .u = 0x80,
             .v = 0x80,
             .expected = 0xffffff,
-            .todo = FALSE,
             .studio_value = 0xebebeb,
         },
 
@@ -13800,7 +13791,6 @@ static void test_yuv_to_rgb_blt(void)
             .u = 0x00,
             .v = 0x00,
             .expected = 0x008700,
-            .todo = FALSE,
             .studio_value = 0x108410,
         },
         /* Windows will treat anything with a height greater than 576 as HD and,
@@ -13813,7 +13803,6 @@ static void test_yuv_to_rgb_blt(void)
             .u = 0x80,
             .v = 0x80,
             .expected = 0x000000,
-            .todo = TRUE,
             .studio_value = 0x101010,
         },
 
@@ -13824,7 +13813,6 @@ static void test_yuv_to_rgb_blt(void)
             .u = 0x80,
             .v = 0x80,
             .expected = 0xffffff,
-            .todo = TRUE,
             .studio_value = 0xebebeb,
         },
 
@@ -13835,7 +13823,6 @@ static void test_yuv_to_rgb_blt(void)
             .u = 0x66,
             .v = 0xf0,
             .expected = 0xff0100,
-            .todo = TRUE,
             .studio_value = 0xeb1110,
             .test_for_broken = TRUE,
             .broken_value = 0xe90002,
@@ -13848,7 +13835,6 @@ static void test_yuv_to_rgb_blt(void)
             .u = 0x2a,
             .v = 0x1a,
             .expected = 0x00ff01,
-            .todo = TRUE,
             .studio_value = 0x10eb11,
             .test_for_broken = TRUE,
             .broken_value = 0x14ff09,
@@ -13861,7 +13847,6 @@ static void test_yuv_to_rgb_blt(void)
             .u = 0xf0,
             .v = 0x76,
             .expected = 0x0100ff,
-            .todo = TRUE,
             .studio_value = 0x1110eb,
             .test_for_broken = TRUE,
             .broken_value = 0x0300f5,
@@ -13874,7 +13859,6 @@ static void test_yuv_to_rgb_blt(void)
             .u = 0x80,
             .v = 0x80,
             .expected = 0x808080,
-            .todo = TRUE,
             .studio_value = 0x7e7e7e,
         },
 
@@ -13885,7 +13869,6 @@ static void test_yuv_to_rgb_blt(void)
             .u = 0x80,
             .v = 0x80,
             .expected = 0x000000,
-            .todo = FALSE,
             .studio_value = 0x101010,
         },
 
@@ -13896,7 +13879,6 @@ static void test_yuv_to_rgb_blt(void)
             .u = 0x80,
             .v = 0x80,
             .expected = 0xffffff,
-            .todo = FALSE,
             .studio_value = 0xebebeb,
         },
 
@@ -13907,7 +13889,6 @@ static void test_yuv_to_rgb_blt(void)
             .u = 0x00,
             .v = 0x00,
             .expected = 0x004d00,
-            .todo = TRUE,
             .studio_value = 0x105210,
             .test_for_broken = TRUE,
             .broken_value = 0x008700,
@@ -14054,7 +14035,6 @@ static void test_yuv_to_rgb_blt(void)
                 for (x = 0; x < 4; x++)
                 {
                     UINT32 color = pixel[x] & 0xffffff;
-                    todo_wine_if(test_colors[j].todo)
                     ok(compare_color(color, test_colors[j].expected, 1) ||
                             broken(compare_color(color, test_colors[j].expected, 4)) ||
                             broken(compare_color(color, test_colors[j].studio_value, 0x10)) ||
diff --git a/dlls/wined3d/glsl_shader.c b/dlls/wined3d/glsl_shader.c
index df60415f062..7a1f351b2db 100644
--- a/dlls/wined3d/glsl_shader.c
+++ b/dlls/wined3d/glsl_shader.c
@@ -12677,10 +12677,12 @@ static void glsl_blitter_generate_yuv_shader(struct wined3d_string_buffer *buffe
 {
     enum complex_fixup complex_fixup = get_complex_fixup(args->fixup);
 
-    shader_addline(buffer, "const vec4 yuv_coef = vec4(1.403, -0.344, -0.714, 1.770);\n");
+    shader_addline(buffer, "const vec4 yuv_coef_sd = vec4(1.596, -0.392, -0.813, 2.017);\n");
+    shader_addline(buffer, "const vec4 yuv_coef_hd = vec4(1.793, -0.213, -0.533, 2.112);\n");
     shader_addline(buffer, "float luminance;\n");
     shader_addline(buffer, "vec2 texcoord;\n");
     shader_addline(buffer, "vec2 chroma;\n");
+    shader_addline(buffer, "vec4 yuv_coef;\n");
     shader_addline(buffer, "uniform vec2 size;\n");
 
     shader_addline(buffer, "\nvoid main()\n{\n");
@@ -12715,11 +12717,20 @@ static void glsl_blitter_generate_yuv_shader(struct wined3d_string_buffer *buffe
             return;
     }
 
-    /* Calculate the final result. Formula is taken from
-     * http://www.fourcc.org/fccyvrgb.php. Note that the chroma
-     * ranges from -0.5 to 0.5. */
-    shader_addline(buffer, "\n    chroma.xy -= 0.5;\n");
-
+    /* Calculate the final result. Formula is taken from:
+     * https://learn.microsoft.com/en-us/windows/win32/medfound/recommended-8-bit-y....
+     * SD and HD textures use different coefficients. SD is anything with both width and height smaller or equal to 720x576.
+     * Note that input values are clamped for SD, but not HD. Luminance is clamped to [16,235] ([0.063, 0.922] when normalized).
+     * Chroma is clamped to [16,240] ([0.063, 0.941] when normalized). */
+    shader_addline(buffer, "\n    if (size.x <= 720 && size.y <= 576)\n    {\n");
+    shader_addline(buffer, "        luminance = clamp(luminance, 0.063, 0.922);\n");
+    shader_addline(buffer, "        chroma.xy = clamp(chroma.xy, 0.063, 0.941);\n");
+    shader_addline(buffer, "        yuv_coef = yuv_coef_sd;\n");
+    shader_addline(buffer, "    }\n    else\n    {\n");
+    shader_addline(buffer, "        yuv_coef = yuv_coef_hd;\n");
+    shader_addline(buffer, "    }\n");
+    shader_addline(buffer, "    luminance = (luminance - 0.063) * 1.164;\n");
+    shader_addline(buffer, "    chroma.xy = chroma.xy - 0.5;\n");
     shader_addline(buffer, "    %s.x = luminance + chroma.x * yuv_coef.x;\n", output);
     shader_addline(buffer, "    %s.y = luminance + chroma.y * yuv_coef.y + chroma.x * yuv_coef.z;\n", output);
     shader_addline(buffer, "    %s.z = luminance + chroma.y * yuv_coef.w;\n", output);
-- 
GitLab

https://gitlab.winehq.org/wine/wine/-/merge_requests/7324