mesa: added _mesa_get_format_color_encoding()

src/mesa/main/formats.c

@@ -637,6 +637,31 @@ _mesa_is_format_compressed(gl_format format)
 }
 
 
+/**
+ * Return color encoding for given format.
+ * \return GL_LINEAR or GL_SRGB
+ */
+GLenum
+_mesa_get_format_color_encoding(gl_format format)
+{
+   /* XXX this info should be encoded in gl_format_info */
+   switch (format) {
+   case MESA_FORMAT_SRGB8:
+   case MESA_FORMAT_SRGBA8:
+   case MESA_FORMAT_SARGB8:
+   case MESA_FORMAT_SL8:
+   case MESA_FORMAT_SLA8:
+   case MESA_FORMAT_SRGB_DXT1:
+   case MESA_FORMAT_SRGBA_DXT1:
+   case MESA_FORMAT_SRGBA_DXT3:
+   case MESA_FORMAT_SRGBA_DXT5:
+      return GL_SRGB;
+   default:
+      return GL_LINEAR;
+   }
+}
+
+
 /**
  * Return number of bytes needed to store an image of the given size
  * in the given format.

src/mesa/main/formats.h

@@ -152,6 +152,9 @@ _mesa_get_format_base_format(gl_format format);
 extern GLboolean
 _mesa_is_format_compressed(gl_format format);
 
+extern GLenum
+_mesa_get_format_color_encoding(gl_format format);
+
 extern GLuint
 _mesa_format_image_size(gl_format format, GLsizei width,
                         GLsizei height, GLsizei depth);