[Mesa-dev] [PATCH 40/65] mesa/glformats: Add a helper function _mesa_is_srgb_format()

[Eduardo Lima Mitev]

Returns true if the passed format is an sRGB format, false otherwise.
---
 src/mesa/main/glformats.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
 src/mesa/main/glformats.h |  3 +++
 2 files changed, 48 insertions(+)

diff --git a/src/mesa/main/glformats.c b/src/mesa/main/glformats.c
index 87497d2..e947543 100644
--- a/src/mesa/main/glformats.c
+++ b/src/mesa/main/glformats.c
@@ -1339,6 +1339,51 @@ _mesa_is_compressed_format(const struct gl_context *ctx, GLenum format)
 }
 
 /**
+ * Test if the given format represents an sRGB format.
+ * \param format the GL format (can be an internal format)
+ * \return GL_TRUE if format is sRGB, GL_FALSE otherwise
+ */
+GLboolean
+_mesa_is_srgb_format(GLenum format)
+{
+   switch (format) {
+   case GL_SRGB:
+   case GL_SRGB8:
+   case GL_SRGB_ALPHA:
+   case GL_SRGB8_ALPHA8:
+   case GL_COMPRESSED_SRGB:
+   case GL_COMPRESSED_SRGB_ALPHA:
+   case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
+   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
+   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
+   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
+   case GL_COMPRESSED_SRGB8_ETC2:
+   case GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC:
+   case GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2:
+   case GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM:
+   case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR:
+   case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR:
+   case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR:
+   case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR:
+   case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR:
+   case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR:
+   case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR:
+   case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR:
+   case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR:
+   case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR:
+   case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR:
+   case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR:
+   case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR:
+   case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR:
+      return GL_TRUE;
+   default:
+      break;
+   }
+
+   return GL_FALSE;
+}
+
+/**
  * Convert various unpack formats to the corresponding base format.
  */
 GLenum
diff --git a/src/mesa/main/glformats.h b/src/mesa/main/glformats.h
index b366855..00d2767 100644
--- a/src/mesa/main/glformats.h
+++ b/src/mesa/main/glformats.h
@@ -101,6 +101,9 @@ _mesa_is_depth_or_stencil_format(GLenum format);
 extern GLboolean
 _mesa_is_compressed_format(const struct gl_context *ctx, GLenum format);
 
+extern GLboolean
+_mesa_is_srgb_format(GLenum format);
+
 extern GLenum
 _mesa_base_format_to_integer_format(GLenum format);
 
-- 
2.5.3