[Mesa-dev] [PATCH] mesa: recognize enums GL_COLOR_ATTACHMENT8-31 as valid

[Ilia Mirkin]

Similar as for AUX1-3, these enums aren't invalid (i.e. -1) but also not
supported by mesa. Returning BUFFER_COUNT causes the proper error to be
returned by ReadBuffer and other functions. This resolves some failures
in

dEQP-GLES31.functional.debug.negative_coverage.get_error.buffer.read_buffer

Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
---
 src/mesa/main/buffers.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/mesa/main/buffers.c b/src/mesa/main/buffers.c
index 83e238a..3ca4b66 100644
--- a/src/mesa/main/buffers.c
+++ b/src/mesa/main/buffers.c
@@ -159,6 +159,9 @@ draw_buffer_enum_to_bitmask(const struct gl_context *ctx, GLenum buffer)
       case GL_COLOR_ATTACHMENT7_EXT:
          return BUFFER_BIT_COLOR7;
       default:
+         /* not an error, but also not supported */
+         if (buffer >= GL_COLOR_ATTACHMENT8 && buffer <= GL_COLOR_ATTACHMENT31)
+            return 1 << BUFFER_COUNT;
          /* error */
          return BAD_MASK;
    }
@@ -214,6 +217,9 @@ read_buffer_enum_to_index(GLenum buffer)
       case GL_COLOR_ATTACHMENT7_EXT:
          return BUFFER_COLOR7;
       default:
+         /* not an error, but also not supported */
+         if (buffer >= GL_COLOR_ATTACHMENT8 && buffer <= GL_COLOR_ATTACHMENT31)
+            return BUFFER_COUNT;
          /* error */
          return -1;
    }
-- 
2.4.10