[Mesa-dev] [PATCH 4/4] i965: Add support for and expose EXT_texture_sRGB_R8

[Gert Wollny]

Emulate MESA_FORMAT_R_SRGB8 by using L8_UNORM_SRGB. This is possible
because component swizzling is handled based on the mesa format and,
hence, the a r001 swizzling can be used to correct the components.

Enables and makes pass (tested on Kabylake)

  dEQP-GLES31.functional.srgb_texture_decode.skip_decode.sr8.*
  dEQP-GLES31.functional.texture.filtering.cube_array.formats.sr8*

Signed-off-by: Gert Wollny <gert.wollny at collabora.com>
---
 src/mesa/drivers/dri/i965/brw_surface_formats.c | 1 +
 src/mesa/drivers/dri/i965/intel_extensions.c    | 1 +
 2 files changed, 2 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_surface_formats.c b/src/mesa/drivers/dri/i965/brw_surface_formats.c
index 879cb42453..77476a8c7e 100644
--- a/src/mesa/drivers/dri/i965/brw_surface_formats.c
+++ b/src/mesa/drivers/dri/i965/brw_surface_formats.c
@@ -67,6 +67,7 @@ brw_isl_format_for_mesa_format(mesa_format mesa_format)
       [MESA_FORMAT_B8G8R8A8_SRGB] = ISL_FORMAT_B8G8R8A8_UNORM_SRGB,
       [MESA_FORMAT_R8G8B8A8_SRGB] = ISL_FORMAT_R8G8B8A8_UNORM_SRGB,
       [MESA_FORMAT_B8G8R8X8_SRGB] = ISL_FORMAT_B8G8R8X8_UNORM_SRGB,
+      [MESA_FORMAT_R_SRGB8] = ISL_FORMAT_L8_UNORM_SRGB,
       [MESA_FORMAT_L_SRGB8] = ISL_FORMAT_L8_UNORM_SRGB,
       [MESA_FORMAT_L8A8_SRGB] = ISL_FORMAT_L8A8_UNORM_SRGB,
       [MESA_FORMAT_SRGB_DXT1] = ISL_FORMAT_BC1_UNORM_SRGB,
diff --git a/src/mesa/drivers/dri/i965/intel_extensions.c b/src/mesa/drivers/dri/i965/intel_extensions.c
index d7e02efb54..6ec6248a70 100644
--- a/src/mesa/drivers/dri/i965/intel_extensions.c
+++ b/src/mesa/drivers/dri/i965/intel_extensions.c
@@ -113,6 +113,7 @@ intelInitExtensions(struct gl_context *ctx)
    ctx->Extensions.EXT_texture_snorm = true;
    ctx->Extensions.EXT_texture_sRGB = true;
    ctx->Extensions.EXT_texture_sRGB_decode = true;
+   ctx->Extensions.EXT_texture_sRGB_R8 = true;
    ctx->Extensions.EXT_texture_swizzle = true;
    ctx->Extensions.EXT_texture_type_2_10_10_10_REV = true;
    ctx->Extensions.EXT_vertex_array_bgra = true;
-- 
2.19.1