diff options
| -rw-r--r-- | src/mesa/main/api_validate.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/mesa/main/api_validate.c b/src/mesa/main/api_validate.c index 2e211c7f3a9..53c8fb893b5 100644 --- a/src/mesa/main/api_validate.c +++ b/src/mesa/main/api_validate.c @@ -69,6 +69,25 @@ check_valid_to_render(struct gl_context *ctx, const char *function) return false; } + /* The spec argues that this is allowed because a tess ctrl shader + * without a tess eval shader can be used with transform feedback. + * However, glBeginTransformFeedback doesn't allow GL_PATCHES and + * therefore doesn't allow tessellation. + * + * Further investigation showed that this is indeed a spec bug and + * a tess ctrl shader without a tess eval shader shouldn't have been + * allowed, because there is no API in GL 4.0 that can make use this + * to produce something useful. + * + * Also, all vendors except one don't support a tess ctrl shader without + * a tess eval shader anyway. + */ + if (ctx->TessCtrlProgram._Current && !ctx->TessEvalProgram._Current) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "%s(tess eval shader is missing)", function); + return false; + } + /* Section 7.3 (Program Objects) of the OpenGL 4.5 Core Profile spec * says: * |