radv: add radv_dump_pipeline_state() helper
[mesa.git] / src / amd / vulkan / radv_formats.c
index 8da18189df0366ee3618a51291768f1e6256ffbd..1ac07b41a611acf473daad3c02e7f337686e9342 100644 (file)
@@ -26,7 +26,8 @@
 
 #include "vk_format.h"
 #include "sid.h"
-#include "r600d_common.h"
+
+#include "vk_util.h"
 
 #include "util/u_half.h"
 #include "util/format_srgb.h"
@@ -320,10 +321,8 @@ uint32_t radv_translate_tex_dataformat(VkFormat format,
                        return V_008F14_IMG_DATA_FORMAT_32;
                case 2:
                        return V_008F14_IMG_DATA_FORMAT_32_32;
-#if 0 /* Not supported for render targets */
                case 3:
                        return V_008F14_IMG_DATA_FORMAT_32_32_32;
-#endif
                case 4:
                        return V_008F14_IMG_DATA_FORMAT_32_32_32_32;
                }
@@ -540,6 +539,35 @@ static bool radv_is_zs_format_supported(VkFormat format)
        return radv_translate_dbformat(format) != V_028040_Z_INVALID || format == VK_FORMAT_S8_UINT;
 }
 
+static bool radv_is_filter_minmax_format_supported(VkFormat format)
+{
+       /* From the Vulkan spec 1.1.71:
+        *
+        * "The following formats must support the
+        *  VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_MINMAX_BIT_EXT feature with
+        *  VK_IMAGE_TILING_OPTIMAL, if they support
+        *  VK_FORMAT_FEATURE_SAMPLED_IMAGE_BIT."
+        */
+       /* TODO: enable more formats. */
+       switch (format) {
+       case VK_FORMAT_R8_UNORM:
+       case VK_FORMAT_R8_SNORM:
+       case VK_FORMAT_R16_UNORM:
+       case VK_FORMAT_R16_SNORM:
+       case VK_FORMAT_R16_SFLOAT:
+       case VK_FORMAT_R32_SFLOAT:
+       case VK_FORMAT_D16_UNORM:
+       case VK_FORMAT_X8_D24_UNORM_PACK32:
+       case VK_FORMAT_D32_SFLOAT:
+       case VK_FORMAT_D16_UNORM_S8_UINT:
+       case VK_FORMAT_D24_UNORM_S8_UINT:
+       case VK_FORMAT_D32_SFLOAT_S8_UINT:
+               return true;
+       default:
+               return false;
+       }
+}
+
 static void
 radv_physical_device_get_format_properties(struct radv_physical_device *physical_device,
                                           VkFormat format,
@@ -576,6 +604,13 @@ radv_physical_device_get_format_properties(struct radv_physical_device *physical
                                 VK_FORMAT_FEATURE_BLIT_DST_BIT;
                        tiled |= VK_FORMAT_FEATURE_TRANSFER_SRC_BIT_KHR |
                                 VK_FORMAT_FEATURE_TRANSFER_DST_BIT_KHR;
+
+                       if (radv_is_filter_minmax_format_supported(format))
+                                tiled |= VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_MINMAX_BIT_EXT;
+
+                       /* GFX9 doesn't support linear depth surfaces */
+                       if (physical_device->rad_info.chip_class >= GFX9)
+                               linear = 0;
                }
        } else {
                bool linear_sampling;
@@ -584,6 +619,10 @@ radv_physical_device_get_format_properties(struct radv_physical_device *physical
                                VK_FORMAT_FEATURE_BLIT_SRC_BIT;
                        tiled |= VK_FORMAT_FEATURE_SAMPLED_IMAGE_BIT |
                                VK_FORMAT_FEATURE_BLIT_SRC_BIT;
+
+                       if (radv_is_filter_minmax_format_supported(format))
+                                tiled |= VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_MINMAX_BIT_EXT;
+
                        if (linear_sampling) {
                                linear |= VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_LINEAR_BIT;
                                tiled |= VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_LINEAR_BIT;
@@ -597,13 +636,17 @@ radv_physical_device_get_format_properties(struct radv_physical_device *physical
                                tiled |= VK_FORMAT_FEATURE_COLOR_ATTACHMENT_BLEND_BIT;
                        }
                }
-               if (tiled && util_is_power_of_two(vk_format_get_blocksize(format)) && !scaled) {
+               if (tiled && !scaled) {
                        tiled |= VK_FORMAT_FEATURE_TRANSFER_SRC_BIT_KHR |
                                 VK_FORMAT_FEATURE_TRANSFER_DST_BIT_KHR;
                }
+
+               /* Tiled formatting does not support NPOT pixel sizes */
+               if (!util_is_power_of_two_or_zero(vk_format_get_blocksize(format)))
+                       tiled = 0;
        }
 
-       if (linear && util_is_power_of_two(vk_format_get_blocksize(format)) && !scaled) {
+       if (linear && !scaled) {
                linear |= VK_FORMAT_FEATURE_TRANSFER_SRC_BIT_KHR |
                          VK_FORMAT_FEATURE_TRANSFER_DST_BIT_KHR;
        }
@@ -614,6 +657,25 @@ radv_physical_device_get_format_properties(struct radv_physical_device *physical
                tiled |= VK_FORMAT_FEATURE_STORAGE_IMAGE_ATOMIC_BIT;
        }
 
+       switch(format) {
+       case VK_FORMAT_A2R10G10B10_SNORM_PACK32:
+       case VK_FORMAT_A2B10G10R10_SNORM_PACK32:
+       case VK_FORMAT_A2R10G10B10_SSCALED_PACK32:
+       case VK_FORMAT_A2B10G10R10_SSCALED_PACK32:
+       case VK_FORMAT_A2R10G10B10_SINT_PACK32:
+       case VK_FORMAT_A2B10G10R10_SINT_PACK32:
+               if (physical_device->rad_info.chip_class <= VI &&
+                   physical_device->rad_info.family != CHIP_STONEY) {
+                       buffer &= ~(VK_FORMAT_FEATURE_UNIFORM_TEXEL_BUFFER_BIT |
+                                   VK_FORMAT_FEATURE_STORAGE_TEXEL_BUFFER_BIT);
+                       linear = 0;
+                       tiled = 0;
+               }
+               break;
+       default:
+               break;
+       }
+
        out_properties->linearTilingFeatures = linear;
        out_properties->optimalTilingFeatures = tiled;
        out_properties->bufferFeatures = buffer;
@@ -761,7 +823,7 @@ unsigned radv_translate_colorswap(VkFormat format, bool do_endian_swap)
 #define HAS_SWIZZLE(chan,swz) (desc->swizzle[chan] == VK_SWIZZLE_##swz)
 
        if (format == VK_FORMAT_B10G11R11_UFLOAT_PACK32)
-               return V_0280A0_SWAP_STD;
+               return V_028C70_SWAP_STD;
 
        if (desc->layout != VK_FORMAT_LAYOUT_PLAIN)
                return ~0U;
@@ -769,45 +831,45 @@ unsigned radv_translate_colorswap(VkFormat format, bool do_endian_swap)
        switch (desc->nr_channels) {
        case 1:
                if (HAS_SWIZZLE(0,X))
-                       return V_0280A0_SWAP_STD; /* X___ */
+                       return V_028C70_SWAP_STD; /* X___ */
                else if (HAS_SWIZZLE(3,X))
-                       return V_0280A0_SWAP_ALT_REV; /* ___X */
+                       return V_028C70_SWAP_ALT_REV; /* ___X */
                break;
        case 2:
                if ((HAS_SWIZZLE(0,X) && HAS_SWIZZLE(1,Y)) ||
                    (HAS_SWIZZLE(0,X) && HAS_SWIZZLE(1,NONE)) ||
                    (HAS_SWIZZLE(0,NONE) && HAS_SWIZZLE(1,Y)))
-                       return V_0280A0_SWAP_STD; /* XY__ */
+                       return V_028C70_SWAP_STD; /* XY__ */
                else if ((HAS_SWIZZLE(0,Y) && HAS_SWIZZLE(1,X)) ||
                         (HAS_SWIZZLE(0,Y) && HAS_SWIZZLE(1,NONE)) ||
                         (HAS_SWIZZLE(0,NONE) && HAS_SWIZZLE(1,X)))
                        /* YX__ */
-                       return (do_endian_swap ? V_0280A0_SWAP_STD : V_0280A0_SWAP_STD_REV);
+                       return (do_endian_swap ? V_028C70_SWAP_STD : V_028C70_SWAP_STD_REV);
                else if (HAS_SWIZZLE(0,X) && HAS_SWIZZLE(3,Y))
-                       return V_0280A0_SWAP_ALT; /* X__Y */
+                       return V_028C70_SWAP_ALT; /* X__Y */
                else if (HAS_SWIZZLE(0,Y) && HAS_SWIZZLE(3,X))
-                       return V_0280A0_SWAP_ALT_REV; /* Y__X */
+                       return V_028C70_SWAP_ALT_REV; /* Y__X */
                break;
        case 3:
                if (HAS_SWIZZLE(0,X))
-                       return (do_endian_swap ? V_0280A0_SWAP_STD_REV : V_0280A0_SWAP_STD);
+                       return (do_endian_swap ? V_028C70_SWAP_STD_REV : V_028C70_SWAP_STD);
                else if (HAS_SWIZZLE(0,Z))
-                       return V_0280A0_SWAP_STD_REV; /* ZYX */
+                       return V_028C70_SWAP_STD_REV; /* ZYX */
                break;
        case 4:
                /* check the middle channels, the 1st and 4th channel can be NONE */
                if (HAS_SWIZZLE(1,Y) && HAS_SWIZZLE(2,Z)) {
-                       return V_0280A0_SWAP_STD; /* XYZW */
+                       return V_028C70_SWAP_STD; /* XYZW */
                } else if (HAS_SWIZZLE(1,Z) && HAS_SWIZZLE(2,Y)) {
-                       return V_0280A0_SWAP_STD_REV; /* WZYX */
+                       return V_028C70_SWAP_STD_REV; /* WZYX */
                } else if (HAS_SWIZZLE(1,Y) && HAS_SWIZZLE(2,X)) {
-                       return V_0280A0_SWAP_ALT; /* ZYXW */
+                       return V_028C70_SWAP_ALT; /* ZYXW */
                } else if (HAS_SWIZZLE(1,Z) && HAS_SWIZZLE(2,W)) {
                        /* YZWX */
                        if (desc->is_array)
-                               return V_0280A0_SWAP_ALT_REV;
+                               return V_028C70_SWAP_ALT_REV;
                        else
-                               return (do_endian_swap ? V_0280A0_SWAP_ALT : V_0280A0_SWAP_ALT_REV);
+                               return (do_endian_swap ? V_028C70_SWAP_ALT : V_028C70_SWAP_ALT_REV);
                }
                break;
        }
@@ -956,6 +1018,12 @@ bool radv_format_pack_clear_color(VkFormat format,
                clear_vals[1] = ((uint16_t)util_iround(CLAMP(value->float32[2], 0.0f, 1.0f) * 0xffff)) & 0xffff;
                clear_vals[1] |= ((uint16_t)util_iround(CLAMP(value->float32[3], 0.0f, 1.0f) * 0xffff)) << 16;
                break;
+       case VK_FORMAT_R16G16B16A16_SNORM:
+               clear_vals[0] = ((uint16_t)util_iround(CLAMP(value->float32[0], -1.0f, 1.0f) * 0x7fff)) & 0xffff;
+               clear_vals[0] |= ((uint16_t)util_iround(CLAMP(value->float32[1], -1.0f, 1.0f) * 0x7fff)) << 16;
+               clear_vals[1] = ((uint16_t)util_iround(CLAMP(value->float32[2], -1.0f, 1.0f) * 0x7fff)) & 0xffff;
+               clear_vals[1] |= ((uint16_t)util_iround(CLAMP(value->float32[3], -1.0f, 1.0f) * 0x7fff)) << 16;
+               break;
        case VK_FORMAT_A2B10G10R10_UNORM_PACK32:
                clear_vals[0] = ((uint16_t)util_iround(CLAMP(value->float32[0], 0.0f, 1.0f) * 0x3ff)) & 0x3ff;
                clear_vals[0] |= (((uint16_t)util_iround(CLAMP(value->float32[1], 0.0f, 1.0f) * 0x3ff)) & 0x3ff) << 10;
@@ -975,6 +1043,27 @@ bool radv_format_pack_clear_color(VkFormat format,
                clear_vals[0] = float3_to_r11g11b10f(value->float32);
                clear_vals[1] = 0;
                break;
+       case VK_FORMAT_R32G32B32A32_SFLOAT:
+               if (value->float32[0] != value->float32[1] ||
+                   value->float32[0] != value->float32[2])
+                       return false;
+               clear_vals[0] = fui(value->float32[0]);
+               clear_vals[1] = fui(value->float32[3]);
+               break;
+       case VK_FORMAT_R32G32B32A32_UINT:
+               if (value->uint32[0] != value->uint32[1] ||
+                   value->uint32[0] != value->uint32[2])
+                       return false;
+               clear_vals[0] = value->uint32[0];
+               clear_vals[1] = value->uint32[3];
+               break;
+       case VK_FORMAT_R32G32B32A32_SINT:
+               if (value->int32[0] != value->int32[1] ||
+                   value->int32[0] != value->int32[2])
+                       return false;
+               clear_vals[0] = value->int32[0];
+               clear_vals[1] = value->int32[3];
+               break;
        default:
                fprintf(stderr, "failed to fast clear %d\n", format);
                return false;
@@ -994,7 +1083,7 @@ void radv_GetPhysicalDeviceFormatProperties(
                                                   pFormatProperties);
 }
 
-void radv_GetPhysicalDeviceFormatProperties2KHR(
+void radv_GetPhysicalDeviceFormatProperties2(
        VkPhysicalDevice                            physicalDevice,
        VkFormat                                    format,
        VkFormatProperties2KHR*                         pFormatProperties)
@@ -1031,6 +1120,9 @@ static VkResult radv_get_image_format_properties(struct radv_physical_device *ph
        if (format_feature_flags == 0)
                goto unsupported;
 
+       if (info->type != VK_IMAGE_TYPE_2D && vk_format_is_depth_or_stencil(info->format))
+               goto unsupported;
+
        switch (info->type) {
        default:
                unreachable("bad vkimage type\n");
@@ -1140,14 +1232,123 @@ VkResult radv_GetPhysicalDeviceImageFormatProperties(
                                                pImageFormatProperties);
 }
 
-VkResult radv_GetPhysicalDeviceImageFormatProperties2KHR(
+static void
+get_external_image_format_properties(const VkPhysicalDeviceImageFormatInfo2KHR *pImageFormatInfo,
+                                    VkExternalMemoryHandleTypeFlagBitsKHR handleType,
+                                    VkExternalMemoryPropertiesKHR *external_properties)
+{
+       VkExternalMemoryFeatureFlagBitsKHR flags = 0;
+       VkExternalMemoryHandleTypeFlagsKHR export_flags = 0;
+       VkExternalMemoryHandleTypeFlagsKHR compat_flags = 0;
+       switch (handleType) {
+       case VK_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_FD_BIT_KHR:
+       case VK_EXTERNAL_MEMORY_HANDLE_TYPE_DMA_BUF_BIT_EXT:
+               switch (pImageFormatInfo->type) {
+               case VK_IMAGE_TYPE_2D:
+                       flags = VK_EXTERNAL_MEMORY_FEATURE_DEDICATED_ONLY_BIT_KHR|VK_EXTERNAL_MEMORY_FEATURE_EXPORTABLE_BIT_KHR|VK_EXTERNAL_MEMORY_FEATURE_IMPORTABLE_BIT_KHR;
+                       compat_flags = export_flags = VK_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_FD_BIT_KHR |
+                                                     VK_EXTERNAL_MEMORY_HANDLE_TYPE_DMA_BUF_BIT_EXT;
+                       break;
+               default:
+                       break;
+               }
+               break;
+       case VK_EXTERNAL_MEMORY_HANDLE_TYPE_HOST_ALLOCATION_BIT_EXT:
+               flags = VK_EXTERNAL_MEMORY_FEATURE_IMPORTABLE_BIT_KHR;
+               compat_flags = VK_EXTERNAL_MEMORY_HANDLE_TYPE_HOST_ALLOCATION_BIT_EXT;
+               break;
+       default:
+               break;
+       }
+
+       *external_properties = (VkExternalMemoryPropertiesKHR) {
+               .externalMemoryFeatures = flags,
+               .exportFromImportedHandleTypes = export_flags,
+               .compatibleHandleTypes = compat_flags,
+       };
+}
+
+VkResult radv_GetPhysicalDeviceImageFormatProperties2(
        VkPhysicalDevice                            physicalDevice,
        const VkPhysicalDeviceImageFormatInfo2KHR  *base_info,
        VkImageFormatProperties2KHR                *base_props)
 {
        RADV_FROM_HANDLE(radv_physical_device, physical_device, physicalDevice);
-       return radv_get_image_format_properties(physical_device, base_info,
+       const VkPhysicalDeviceExternalImageFormatInfoKHR *external_info = NULL;
+       VkExternalImageFormatPropertiesKHR *external_props = NULL;
+       VkResult result;
+
+       result = radv_get_image_format_properties(physical_device, base_info,
                                                &base_props->imageFormatProperties);
+       if (result != VK_SUCCESS)
+               return result;
+
+          /* Extract input structs */
+       vk_foreach_struct_const(s, base_info->pNext) {
+               switch (s->sType) {
+               case VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_EXTERNAL_IMAGE_FORMAT_INFO_KHR:
+                       external_info = (const void *) s;
+                       break;
+               default:
+                       break;
+               }
+       }
+
+       /* Extract output structs */
+       vk_foreach_struct(s, base_props->pNext) {
+               switch (s->sType) {
+               case VK_STRUCTURE_TYPE_EXTERNAL_IMAGE_FORMAT_PROPERTIES_KHR:
+                       external_props = (void *) s;
+                       break;
+               default:
+                       break;
+               }
+       }
+
+       /* From the Vulkan 1.0.42 spec:
+        *
+        *    If handleType is 0, vkGetPhysicalDeviceImageFormatProperties2KHR will
+        *    behave as if VkPhysicalDeviceExternalImageFormatInfoKHR was not
+        *    present and VkExternalImageFormatPropertiesKHR will be ignored.
+        */
+       if (external_info && external_info->handleType != 0) {
+               switch (external_info->handleType) {
+               case VK_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_FD_BIT_KHR:
+               case VK_EXTERNAL_MEMORY_HANDLE_TYPE_DMA_BUF_BIT_EXT:
+               case VK_EXTERNAL_MEMORY_HANDLE_TYPE_HOST_ALLOCATION_BIT_EXT:
+                       get_external_image_format_properties(base_info, external_info->handleType,
+                                                            &external_props->externalMemoryProperties);
+                       break;
+               default:
+                       /* From the Vulkan 1.0.42 spec:
+                        *
+                        *    If handleType is not compatible with the [parameters] specified
+                        *    in VkPhysicalDeviceImageFormatInfo2KHR, then
+                        *    vkGetPhysicalDeviceImageFormatProperties2KHR returns
+                        *    VK_ERROR_FORMAT_NOT_SUPPORTED.
+                        */
+                       result = vk_errorf(VK_ERROR_FORMAT_NOT_SUPPORTED,
+                                          "unsupported VkExternalMemoryTypeFlagBitsKHR 0x%x",
+                                          external_info->handleType);
+                       goto fail;
+               }
+       }
+
+       return VK_SUCCESS;
+
+fail:
+       if (result == VK_ERROR_FORMAT_NOT_SUPPORTED) {
+               /* From the Vulkan 1.0.42 spec:
+                *
+                *    If the combination of parameters to
+                *    vkGetPhysicalDeviceImageFormatProperties2KHR is not supported by
+                *    the implementation for use in vkCreateImage, then all members of
+                *    imageFormatProperties will be filled with zero.
+                */
+               base_props->imageFormatProperties = (VkImageFormatProperties) {0};
+       }
+
+       return result;
 }
 
 void radv_GetPhysicalDeviceSparseImageFormatProperties(
@@ -1164,7 +1365,7 @@ void radv_GetPhysicalDeviceSparseImageFormatProperties(
        *pNumProperties = 0;
 }
 
-void radv_GetPhysicalDeviceSparseImageFormatProperties2KHR(
+void radv_GetPhysicalDeviceSparseImageFormatProperties2(
        VkPhysicalDevice                            physicalDevice,
        const VkPhysicalDeviceSparseImageFormatInfo2KHR* pFormatInfo,
        uint32_t                                   *pPropertyCount,
@@ -1173,3 +1374,118 @@ void radv_GetPhysicalDeviceSparseImageFormatProperties2KHR(
        /* Sparse images are not yet supported. */
        *pPropertyCount = 0;
 }
+
+void radv_GetPhysicalDeviceExternalBufferProperties(
+       VkPhysicalDevice                            physicalDevice,
+       const VkPhysicalDeviceExternalBufferInfoKHR *pExternalBufferInfo,
+       VkExternalBufferPropertiesKHR               *pExternalBufferProperties)
+{
+       VkExternalMemoryFeatureFlagBitsKHR flags = 0;
+       VkExternalMemoryHandleTypeFlagsKHR export_flags = 0;
+       VkExternalMemoryHandleTypeFlagsKHR compat_flags = 0;
+       switch(pExternalBufferInfo->handleType) {
+       case VK_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_FD_BIT_KHR:
+       case VK_EXTERNAL_MEMORY_HANDLE_TYPE_DMA_BUF_BIT_EXT:
+               flags = VK_EXTERNAL_MEMORY_FEATURE_EXPORTABLE_BIT_KHR |
+                       VK_EXTERNAL_MEMORY_FEATURE_IMPORTABLE_BIT_KHR;
+               compat_flags = export_flags = VK_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_FD_BIT_KHR |
+                                             VK_EXTERNAL_MEMORY_HANDLE_TYPE_DMA_BUF_BIT_EXT;
+               break;
+       case VK_EXTERNAL_MEMORY_HANDLE_TYPE_HOST_ALLOCATION_BIT_EXT:
+               flags = VK_EXTERNAL_MEMORY_FEATURE_IMPORTABLE_BIT_KHR;
+               compat_flags = VK_EXTERNAL_MEMORY_HANDLE_TYPE_HOST_ALLOCATION_BIT_EXT;
+               break;
+       default:
+               break;
+       }
+       pExternalBufferProperties->externalMemoryProperties = (VkExternalMemoryPropertiesKHR) {
+               .externalMemoryFeatures = flags,
+               .exportFromImportedHandleTypes = export_flags,
+               .compatibleHandleTypes = compat_flags,
+       };
+}
+
+/* DCC channel type categories within which formats can be reinterpreted
+ * while keeping the same DCC encoding. The swizzle must also match. */
+enum dcc_channel_type {
+        dcc_channel_float32,
+        dcc_channel_uint32,
+        dcc_channel_sint32,
+        dcc_channel_float16,
+        dcc_channel_uint16,
+        dcc_channel_sint16,
+        dcc_channel_uint_10_10_10_2,
+        dcc_channel_uint8,
+        dcc_channel_sint8,
+        dcc_channel_incompatible,
+};
+
+/* Return the type of DCC encoding. */
+static enum dcc_channel_type
+radv_get_dcc_channel_type(const struct vk_format_description *desc)
+{
+        int i;
+
+        /* Find the first non-void channel. */
+        for (i = 0; i < desc->nr_channels; i++)
+                if (desc->channel[i].type != VK_FORMAT_TYPE_VOID)
+                        break;
+        if (i == desc->nr_channels)
+                return dcc_channel_incompatible;
+
+        switch (desc->channel[i].size) {
+        case 32:
+                if (desc->channel[i].type == VK_FORMAT_TYPE_FLOAT)
+                        return dcc_channel_float32;
+                if (desc->channel[i].type == VK_FORMAT_TYPE_UNSIGNED)
+                        return dcc_channel_uint32;
+                return dcc_channel_sint32;
+        case 16:
+                if (desc->channel[i].type == VK_FORMAT_TYPE_FLOAT)
+                        return dcc_channel_float16;
+                if (desc->channel[i].type == VK_FORMAT_TYPE_UNSIGNED)
+                        return dcc_channel_uint16;
+                return dcc_channel_sint16;
+        case 10:
+                return dcc_channel_uint_10_10_10_2;
+        case 8:
+                if (desc->channel[i].type == VK_FORMAT_TYPE_UNSIGNED)
+                        return dcc_channel_uint8;
+                return dcc_channel_sint8;
+        default:
+                return dcc_channel_incompatible;
+        }
+}
+
+/* Return if it's allowed to reinterpret one format as another with DCC enabled. */
+bool radv_dcc_formats_compatible(VkFormat format1,
+                                 VkFormat format2)
+{
+        const struct vk_format_description *desc1, *desc2;
+        enum dcc_channel_type type1, type2;
+        int i;
+
+        if (format1 == format2)
+                return true;
+
+        desc1 = vk_format_description(format1);
+        desc2 = vk_format_description(format2);
+
+        if (desc1->nr_channels != desc2->nr_channels)
+                return false;
+
+        /* Swizzles must be the same. */
+        for (i = 0; i < desc1->nr_channels; i++)
+                if (desc1->swizzle[i] <= VK_SWIZZLE_W &&
+                    desc2->swizzle[i] <= VK_SWIZZLE_W &&
+                    desc1->swizzle[i] != desc2->swizzle[i])
+                        return false;
+
+        type1 = radv_get_dcc_channel_type(desc1);
+        type2 = radv_get_dcc_channel_type(desc2);
+
+        return type1 != dcc_channel_incompatible &&
+               type2 != dcc_channel_incompatible &&
+               type1 == type2;
+}
+