main/formats: Autogenerate _mesa_get_srgb_format_linear

Due to the wonders of autogeneration, this new version covers a few
formats that the old version was missing:

    MESA_FORMAT_SRGB8_ALPHA8_ASTC_3x3x3
    MESA_FORMAT_SRGB8_ALPHA8_ASTC_4x3x3
    MESA_FORMAT_SRGB8_ALPHA8_ASTC_4x4x3
    MESA_FORMAT_SRGB8_ALPHA8_ASTC_4x4x4
    MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x4x4
    MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x5x4
    MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x5x5
    MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x5x5
    MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x6x5
    MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x6x6

Reviewed-by: Chad Versace <chadversary@chromium.org>

src/mesa/main/format_fallback.py

@@ -38,6 +38,34 @@ def parse_args():
     p.add_argument("out")
     return p.parse_args()
 
+def get_unorm_to_srgb_map(formats):
+    names = set(fmt.name for fmt in formats)
+
+    for fmt in formats:
+        if fmt.colorspace != 'srgb':
+            continue;
+
+        replacements = [
+            ('SRGB', 'RGB'),
+            ('SRGB', 'UNORM'),
+            ('SRGB8_ALPHA8', 'RGBA'),
+            ('SRGB8_ALPHA8', 'RGBA8'),
+            ('SRGB_ALPHA_UNORM', 'RGBA_UNORM'),
+        ]
+        found_unorm_name = False
+        for rep in replacements:
+            if fmt.name.find(rep[0]) == -1:
+                continue
+
+            unorm_name = fmt.name.replace(rep[0], rep[1])
+            if unorm_name in names:
+                yield unorm_name, fmt.name
+                found_unorm_name = True
+                break
+
+        # Every sRGB format MUST have a UNORM equivalent
+        assert found_unorm_name
+
 def get_rgbx_to_rgba_map(formats):
     names = set(fmt.name for fmt in formats)
 
@@ -60,6 +88,23 @@ def get_rgbx_to_rgba_map(formats):
 TEMPLATE = Template(COPYRIGHT + """
 #include "formats.h"
 
+/**
+ * For an sRGB format, return the corresponding linear color space format.
+ * For non-sRGB formats, return the format as-is.
+ */
+mesa_format
+_mesa_get_srgb_format_linear(mesa_format format)
+{
+   switch (format) {
+%for unorm, srgb in unorm_to_srgb_map:
+   case ${srgb}:
+      return ${unorm};
+%endfor
+   default:
+      return format;
+   }
+}
+
 /**
  * If the format has an alpha channel, and there exists a non-alpha
  * variant of the format with an identical bit layout, then return
@@ -94,6 +139,7 @@ def main():
     formats = list(format_parser.parse(pargs.csv))
 
     template_env = {
+        'unorm_to_srgb_map': list(get_unorm_to_srgb_map(formats)),
         'rgbx_to_rgba_map': list(get_rgbx_to_rgba_map(formats)),
     }
 

src/mesa/main/formats.c

@@ -621,123 +621,6 @@ _mesa_is_format_etc2(mesa_format format)
 }
 
 
-/**
- * For an sRGB format, return the corresponding linear color space format.
- * For non-sRGB formats, return the format as-is.
- */
-mesa_format
-_mesa_get_srgb_format_linear(mesa_format format)
-{
-   switch (format) {
-   case MESA_FORMAT_BGR_SRGB8:
-      format = MESA_FORMAT_BGR_UNORM8;
-      break;
-   case MESA_FORMAT_A8B8G8R8_SRGB:
-      format = MESA_FORMAT_A8B8G8R8_UNORM;
-      break;
-   case MESA_FORMAT_B8G8R8A8_SRGB:
-      format = MESA_FORMAT_B8G8R8A8_UNORM;
-      break;
-   case MESA_FORMAT_A8R8G8B8_SRGB:
-      format = MESA_FORMAT_A8R8G8B8_UNORM;
-      break;
-   case MESA_FORMAT_R8G8B8A8_SRGB:
-      format = MESA_FORMAT_R8G8B8A8_UNORM;
-      break;
-   case MESA_FORMAT_L_SRGB8:
-      format = MESA_FORMAT_L_UNORM8;
-      break;
-   case MESA_FORMAT_L8A8_SRGB:
-      format = MESA_FORMAT_L8A8_UNORM;
-      break;
-   case MESA_FORMAT_A8L8_SRGB:
-      format = MESA_FORMAT_A8L8_UNORM;
-      break;
-   case MESA_FORMAT_SRGB_DXT1:
-      format = MESA_FORMAT_RGB_DXT1;
-      break;
-   case MESA_FORMAT_SRGBA_DXT1:
-      format = MESA_FORMAT_RGBA_DXT1;
-      break;
-   case MESA_FORMAT_SRGBA_DXT3:
-      format = MESA_FORMAT_RGBA_DXT3;
-      break;
-   case MESA_FORMAT_SRGBA_DXT5:
-      format = MESA_FORMAT_RGBA_DXT5;
-      break;
-   case MESA_FORMAT_R8G8B8X8_SRGB:
-      format = MESA_FORMAT_R8G8B8X8_UNORM;
-      break;
-   case MESA_FORMAT_X8B8G8R8_SRGB:
-      format = MESA_FORMAT_X8B8G8R8_UNORM;
-      break;
-   case MESA_FORMAT_ETC2_SRGB8:
-      format = MESA_FORMAT_ETC2_RGB8;
-      break;
-   case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
-      format = MESA_FORMAT_ETC2_RGBA8_EAC;
-      break;
-   case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
-      format = MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1;
-      break;
-   case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
-      format = MESA_FORMAT_BPTC_RGBA_UNORM;
-      break;
-   case MESA_FORMAT_SRGB8_ALPHA8_ASTC_4x4:
-      format = MESA_FORMAT_RGBA_ASTC_4x4;
-      break;
-   case MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x4:
-      format = MESA_FORMAT_RGBA_ASTC_5x4;
-      break;
-   case MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x5:
-      format = MESA_FORMAT_RGBA_ASTC_5x5;
-      break;
-   case MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x5:
-      format = MESA_FORMAT_RGBA_ASTC_6x5;
-      break;
-   case MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x6:
-      format = MESA_FORMAT_RGBA_ASTC_6x6;
-      break;
-   case MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x5:
-      format = MESA_FORMAT_RGBA_ASTC_8x5;
-      break;
-   case MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x6:
-      format = MESA_FORMAT_RGBA_ASTC_8x6;
-      break;
-   case MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x8:
-      format = MESA_FORMAT_RGBA_ASTC_8x8;
-      break;
-   case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x5:
-      format = MESA_FORMAT_RGBA_ASTC_10x5;
-      break;
-   case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x6:
-      format = MESA_FORMAT_RGBA_ASTC_10x6;
-      break;
-   case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x8:
-      format = MESA_FORMAT_RGBA_ASTC_10x8;
-      break;
-   case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x10:
-      format = MESA_FORMAT_RGBA_ASTC_10x10;
-      break;
-   case MESA_FORMAT_SRGB8_ALPHA8_ASTC_12x10:
-      format = MESA_FORMAT_RGBA_ASTC_12x10;
-      break;
-   case MESA_FORMAT_SRGB8_ALPHA8_ASTC_12x12:
-      format = MESA_FORMAT_RGBA_ASTC_12x12;
-      break;
-   case MESA_FORMAT_B8G8R8X8_SRGB:
-      format = MESA_FORMAT_B8G8R8X8_UNORM;
-      break;
-   case MESA_FORMAT_X8R8G8B8_SRGB:
-      format = MESA_FORMAT_X8R8G8B8_UNORM;
-      break;
-   default:
-      break;
-   }
-   return format;
-}
-
-
 /**
  * If the given format is a compressed format, return a corresponding
  * uncompressed format.