[Mesa-dev] [PATCH v2 1/2] mesa: Update DispatchComputeIndirect errors for indirect parameter

[Jordan Justen]

There is some discrepancy between the return values for some error
cases for the DispatchComputeIndirect call in the ARB_compute_shader
specification. Regarding the indirect parameter, in one place the
extension spec lists that the error returned for invalid values should
be INVALID_OPERATION, while later it specifies INVALID_VALUE.

The OpenGL 4.3 and OpenGLES 3.1 specifications appear to be consistent
in requiring the INVALID_VALUE error return in this case.

Here we update the code to match the main specifications, and update
the citations use the main specification rather than the extension
specification.

v2:
 * Updates based on review from Iago

Signed-off-by: Jordan Justen <jordan.l.justen at intel.com>
Cc: Iago Toral Quiroga <itoral at igalia.com>
Cc: Marta Lofstedt <marta.lofstedt at intel.com>
---
 src/mesa/main/api_validate.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/src/mesa/main/api_validate.c b/src/mesa/main/api_validate.c
index 1f729e8..a3ee8c0 100644
--- a/src/mesa/main/api_validate.c
+++ b/src/mesa/main/api_validate.c
@@ -960,20 +960,19 @@ valid_dispatch_indirect(struct gl_context *ctx,
    if (!check_valid_to_compute(ctx, name))
       return GL_FALSE;
 
-   /* From the ARB_compute_shader specification:
+   /* From the OpenGL 4.3 Core Specification, Chapter 19, Compute Shaders:
     *
-    * "An INVALID_OPERATION error is generated [...] if <indirect> is less
-    *  than zero or not a multiple of the size, in basic machine units, of
-    *  uint."
+    * "An INVALID_VALUE error is generated if indirect is negative or is not a
+    *  multiple of four."
     */
    if ((GLintptr)indirect & (sizeof(GLuint) - 1)) {
-      _mesa_error(ctx, GL_INVALID_OPERATION,
+      _mesa_error(ctx, GL_INVALID_VALUE,
                   "%s(indirect is not aligned)", name);
       return GL_FALSE;
    }
 
    if ((GLintptr)indirect < 0) {
-      _mesa_error(ctx, GL_INVALID_OPERATION,
+      _mesa_error(ctx, GL_INVALID_VALUE,
                   "%s(indirect is less than zero)", name);
       return GL_FALSE;
    }
-- 
2.6.2