mesa: Check glReadBuffer enums against the ES3 table.

From the ES 3.2 spec, section 16.1.1 (Selecting Buffers for Reading):

   "An INVALID_ENUM error is generated if src is not BACK or one of
    the values from table 15.5."

Table 15.5 contains NONE and COLOR_ATTACHMENTi.

Mesa properly returned INVALID_ENUM for unknown enums, but it decided
what was known by using read_buffer_enum_to_index, which handles all
enums in every API.  So enums that were valid in GL were making it
past the "valid enum" check.  Such targets would then be classified
as unsupported, and we'd raise INVALID_OPERATION, but that's technically
the wrong error code.

Fixes dEQP-GLES31's
functional.debug.negative_coverage.get_error.buffer.read_buffer

v2: Only call read_buffer_enuM_to_index when required (Eduardo).

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eduardo Lima Mitev <elima@igalia.com>

diff --git a/src/mesa/main/buffers.c b/src/mesa/main/buffers.c
index 26dafd1b786ac07e4576414ab5d2f407dccb9216..a28c5831576575589869fc09ee9363d4caf1b783 100644 (file)
--- a/src/mesa/main/buffers.c
+++ b/src/mesa/main/buffers.c
@@ -222,6 +222,12 @@ read_buffer_enum_to_index(GLenum buffer)
    }
 }
 
+static bool
+is_legal_es3_readbuffer_enum(GLenum buf)
+{
+   return buf == GL_BACK || buf == GL_NONE ||
+          (buf >= GL_COLOR_ATTACHMENT0 && buf <= GL_COLOR_ATTACHMENT31);
+}
 
 /**
  * Called by glDrawBuffer() and glNamedFramebufferDrawBuffer().
@@ -715,7 +721,11 @@ read_buffer(struct gl_context *ctx, struct gl_framebuffer *fb,
    }
    else {
       /* general case / window-system framebuffer */
-      srcBuffer = read_buffer_enum_to_index(buffer);
+      if (_mesa_is_gles3(ctx) && !is_legal_es3_readbuffer_enum(buffer))
+         srcBuffer = -1;
+      else
+         srcBuffer = read_buffer_enum_to_index(buffer);
+
       if (srcBuffer == -1) {
          _mesa_error(ctx, GL_INVALID_ENUM,
                      "%s(invalid buffer %s)", caller,