BT2020_CL is very different from BT2020_NCL, and not currently supported

include/SDL3/SDL_pixels.h

@@ -560,7 +560,7 @@ typedef enum
 
 #define SDL_ISCOLORSPACE_YUV_BT601(X)       (SDL_COLORSPACEMATRIX(X) == SDL_MATRIX_COEFFICIENTS_BT601 || SDL_COLORSPACEMATRIX(X) == SDL_MATRIX_COEFFICIENTS_BT470BG)
 #define SDL_ISCOLORSPACE_YUV_BT709(X)       (SDL_COLORSPACEMATRIX(X) == SDL_MATRIX_COEFFICIENTS_BT709)
-#define SDL_ISCOLORSPACE_YUV_BT2020(X)      (SDL_COLORSPACEMATRIX(X) == SDL_MATRIX_COEFFICIENTS_BT2020_NCL || SDL_COLORSPACEMATRIX(X) == SDL_MATRIX_COEFFICIENTS_BT2020_CL)
+#define SDL_ISCOLORSPACE_YUV_BT2020(X)      (SDL_COLORSPACEMATRIX(X) == SDL_MATRIX_COEFFICIENTS_BT2020_NCL)
 #define SDL_ISCOLORSPACE_LIMITED_RANGE(X)   (SDL_COLORSPACERANGE(X) != SDL_COLOR_RANGE_FULL)
 #define SDL_ISCOLORSPACE_FULL_RANGE(X)      (SDL_COLORSPACERANGE(X) == SDL_COLOR_RANGE_FULL)
 

src/render/metal/SDL_render_metal.m

@@ -596,9 +596,7 @@ size_t GetYCbCRtoRGBConversionMatrix(SDL_Colorspace colorspace, int w, int h, in
     case SDL_MATRIX_COEFFICIENTS_BT709:
         return GetBT709ConversionMatrix(colorspace);
 
-    /* FIXME: Are these the same? */
     case SDL_MATRIX_COEFFICIENTS_BT2020_NCL:
-    case SDL_MATRIX_COEFFICIENTS_BT2020_CL:
         return GetBT2020ConversionMatrix(colorspace);
 
     case SDL_MATRIX_COEFFICIENTS_UNSPECIFIED:

src/render/vulkan/SDL_render_vulkan.c

@@ -2511,9 +2511,7 @@ static int VULKAN_CreateTexture(SDL_Renderer *renderer, SDL_Texture *texture, SD
         case SDL_MATRIX_COEFFICIENTS_BT709:
             samplerYcbcrConversionCreateInfo.ycbcrModel = VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_709_KHR;
             break;
-        /* FIXME: Are these the same? */
         case SDL_MATRIX_COEFFICIENTS_BT2020_NCL:
-        case SDL_MATRIX_COEFFICIENTS_BT2020_CL:
             samplerYcbcrConversionCreateInfo.ycbcrModel = VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_2020_KHR;
             break;
         case SDL_MATRIX_COEFFICIENTS_UNSPECIFIED:

src/video/SDL_pixels.c

@@ -882,9 +882,7 @@ const float *SDL_GetYCbCRtoRGBConversionMatrix(SDL_Colorspace colorspace, int w,
     case SDL_MATRIX_COEFFICIENTS_BT709:
         return SDL_GetBT709ConversionMatrix(colorspace);
 
-    /* FIXME: Are these the same? */
     case SDL_MATRIX_COEFFICIENTS_BT2020_NCL:
-    case SDL_MATRIX_COEFFICIENTS_BT2020_CL:
         return SDL_GetBT2020ConversionMatrix(colorspace);
 
     case SDL_MATRIX_COEFFICIENTS_UNSPECIFIED: