Mesa (main): isl: Add helper to return render compression format encoding

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Module: Mesa
Branch: main
Commit: dd54e9125ad6d8160450e4364cc900a265d85198
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=dd54e9125ad6d8160450e4364cc900a265d85198

Author: Sagar Ghuge <sagar.ghuge at intel.com>
Date:   Wed Feb 24 23:23:57 2021 -0800

isl: Add helper to return render compression format encoding

v2:
- Fix typo (Marcin)
- Fix comment (Nanley)

Signed-off-by: Sagar Ghuge <sagar.ghuge at intel.com>
Reviewed-by: Nanley Chery <nanley.g.chery at intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12686>

---

 src/intel/isl/isl.c | 100 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/intel/isl/isl.h |   1 +
 2 files changed, 101 insertions(+)

diff --git a/src/intel/isl/isl.c b/src/intel/isl/isl.c
index 55b9c5ba94b..0daba4bbbfe 100644
--- a/src/intel/isl/isl.c
+++ b/src/intel/isl/isl.c
@@ -3403,3 +3403,103 @@ isl_format_get_aux_map_encoding(enum isl_format format)
       return 0;
    }
 }
+
+/*
+ * Returns compression format encoding for Unified Lossless Compression
+ */
+uint8_t
+isl_get_render_compression_format(enum isl_format format)
+{
+   /* From the Bspec, Enumeration_RenderCompressionFormat section (53726): */
+   switch(format) {
+   case ISL_FORMAT_R32G32B32A32_FLOAT:
+   case ISL_FORMAT_R32G32B32X32_FLOAT:
+   case ISL_FORMAT_R32G32B32A32_SINT:
+      return 0x0;
+   case ISL_FORMAT_R32G32B32A32_UINT:
+      return 0x1;
+   case ISL_FORMAT_R32G32_FLOAT:
+   case ISL_FORMAT_R32G32_SINT:
+      return 0x2;
+   case ISL_FORMAT_R32G32_UINT:
+      return 0x3;
+   case ISL_FORMAT_R16G16B16A16_UNORM:
+   case ISL_FORMAT_R16G16B16X16_UNORM:
+   case ISL_FORMAT_R16G16B16A16_UINT:
+      return 0x4;
+   case ISL_FORMAT_R16G16B16A16_SNORM:
+   case ISL_FORMAT_R16G16B16A16_SINT:
+   case ISL_FORMAT_R16G16B16A16_FLOAT:
+   case ISL_FORMAT_R16G16B16X16_FLOAT:
+      return 0x5;
+   case ISL_FORMAT_R16G16_UNORM:
+   case ISL_FORMAT_R16G16_UINT:
+      return 0x6;
+   case ISL_FORMAT_R16G16_SNORM:
+   case ISL_FORMAT_R16G16_SINT:
+   case ISL_FORMAT_R16G16_FLOAT:
+      return 0x7;
+   case ISL_FORMAT_B8G8R8A8_UNORM:
+   case ISL_FORMAT_B8G8R8X8_UNORM:
+   case ISL_FORMAT_B8G8R8A8_UNORM_SRGB:
+   case ISL_FORMAT_B8G8R8X8_UNORM_SRGB:
+   case ISL_FORMAT_R8G8B8A8_UNORM:
+   case ISL_FORMAT_R8G8B8X8_UNORM:
+   case ISL_FORMAT_R8G8B8A8_UNORM_SRGB:
+   case ISL_FORMAT_R8G8B8X8_UNORM_SRGB:
+   case ISL_FORMAT_R8G8B8A8_UINT:
+      return 0x8;
+   case ISL_FORMAT_R8G8B8A8_SNORM:
+   case ISL_FORMAT_R8G8B8A8_SINT:
+      return 0x9;
+   case ISL_FORMAT_B5G6R5_UNORM:
+   case ISL_FORMAT_B5G6R5_UNORM_SRGB:
+   case ISL_FORMAT_B5G5R5A1_UNORM:
+   case ISL_FORMAT_B5G5R5A1_UNORM_SRGB:
+   case ISL_FORMAT_B4G4R4A4_UNORM:
+   case ISL_FORMAT_B4G4R4A4_UNORM_SRGB:
+   case ISL_FORMAT_B5G5R5X1_UNORM:
+   case ISL_FORMAT_B5G5R5X1_UNORM_SRGB:
+   case ISL_FORMAT_A1B5G5R5_UNORM:
+   case ISL_FORMAT_A4B4G4R4_UNORM:
+   case ISL_FORMAT_R8G8_UNORM:
+   case ISL_FORMAT_R8G8_UINT:
+      return 0xA;
+   case ISL_FORMAT_R8G8_SNORM:
+   case ISL_FORMAT_R8G8_SINT:
+      return 0xB;
+   case ISL_FORMAT_R10G10B10A2_UNORM:
+   case ISL_FORMAT_R10G10B10A2_UNORM_SRGB:
+   case ISL_FORMAT_R10G10B10_FLOAT_A2_UNORM:
+   case ISL_FORMAT_R10G10B10A2_UINT:
+   case ISL_FORMAT_B10G10R10A2_UNORM:
+   case ISL_FORMAT_B10G10R10X2_UNORM:
+   case ISL_FORMAT_B10G10R10A2_UNORM_SRGB:
+      return 0xC;
+   case ISL_FORMAT_R11G11B10_FLOAT:
+      return 0xD;
+   case ISL_FORMAT_R32_SINT:
+   case ISL_FORMAT_R32_FLOAT:
+      return 0x10;
+   case ISL_FORMAT_R32_UINT:
+   case ISL_FORMAT_R24_UNORM_X8_TYPELESS:
+      return 0x11;
+   case ISL_FORMAT_R16_UNORM:
+   case ISL_FORMAT_R16_UINT:
+      return 0x14;
+   case ISL_FORMAT_R16_SNORM:
+   case ISL_FORMAT_R16_SINT:
+   case ISL_FORMAT_R16_FLOAT:
+      return 0x15;
+   case ISL_FORMAT_R8_UNORM:
+   case ISL_FORMAT_R8_UINT:
+   case ISL_FORMAT_A8_UNORM:
+      return 0x18;
+   case ISL_FORMAT_R8_SNORM:
+   case ISL_FORMAT_R8_SINT:
+      return 0x19;
+   default:
+      unreachable("Unsupported render compression format!");
+      return 0;
+   }
+}
diff --git a/src/intel/isl/isl.h b/src/intel/isl/isl.h
index 1aa5dc5ab36..fcd0d556aeb 100644
--- a/src/intel/isl/isl.h
+++ b/src/intel/isl/isl.h
@@ -1820,6 +1820,7 @@ bool isl_formats_are_ccs_e_compatible(const struct intel_device_info *devinfo,
                                       enum isl_format format1,
                                       enum isl_format format2);
 uint8_t isl_format_get_aux_map_encoding(enum isl_format format);
+uint8_t isl_get_render_compression_format(enum isl_format format);
 
 bool isl_format_has_unorm_channel(enum isl_format fmt) ATTRIBUTE_CONST;
 bool isl_format_has_snorm_channel(enum isl_format fmt) ATTRIBUTE_CONST;