[Mesa-dev] [PATCH 4/4] mesa: fix validate for secondary interpolator

[Miklós Máté]

This patch fixes multiple problems:
- the interpolator check was duplicated
- both had arg instead of argRep
- I split it into color and alpha for better readability and error msg
- the DOT4 check only applies to color instruction according to the spec
- made the DOT4 check fatal, and improved the error msg

Piglit: spec/ati_fragment_shader/error08-secondary

Signed-off-by: Miklós Máté <mtmkls at gmail.com>
---
 src/mesa/main/atifragshader.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/src/mesa/main/atifragshader.c b/src/mesa/main/atifragshader.c
index 313ba0c66d..1bca8267b8 100644
--- a/src/mesa/main/atifragshader.c
+++ b/src/mesa/main/atifragshader.c
@@ -171,15 +171,15 @@ static int check_arith_arg(struct ati_fragment_shader *curProg,
       _mesa_error(ctx, GL_INVALID_ENUM, "C/AFragmentOpATI(arg)");
       return 0;
    }
-   if ((arg == GL_SECONDARY_INTERPOLATOR_ATI) && (((optype == 0) && (argRep == GL_ALPHA)) ||
-      ((optype == 1) && ((arg == GL_ALPHA) || (argRep == GL_NONE))))) {
-      _mesa_error(ctx, GL_INVALID_OPERATION, "C/AFragmentOpATI(sec_interp)");
-      return 0;
-   }
-   if ((arg == GL_SECONDARY_INTERPOLATOR_ATI) && (((optype == 0) && (argRep == GL_ALPHA)) ||
-      ((optype == 1) && ((arg == GL_ALPHA) || (argRep == GL_NONE))))) {
-      _mesa_error(ctx, GL_INVALID_OPERATION, "C/AFragmentOpATI(sec_interp)");
-      return 0;
+   if (arg == GL_SECONDARY_INTERPOLATOR_ATI) {
+      if ((optype == ATI_FRAGMENT_SHADER_COLOR_OP) && (argRep == GL_ALPHA)) {
+         _mesa_error(ctx, GL_INVALID_OPERATION, "CFragmentOpATI(sec_interp)");
+         return 0;
+      } else if ((optype == ATI_FRAGMENT_SHADER_ALPHA_OP) &&
+            ((argRep == GL_ALPHA) || (argRep == GL_NONE))) {
+         _mesa_error(ctx, GL_INVALID_OPERATION, "AFragmentOpATI(sec_interp)");
+         return 0;
+      }
    }
    if ((curProg->cur_pass == 1) &&
       ((arg == GL_PRIMARY_COLOR_ARB) || (arg == GL_SECONDARY_INTERPOLATOR_ATI))) {
@@ -642,10 +642,11 @@ _mesa_FragmentOpXATI(GLint optype, GLuint arg_count, GLenum op, GLuint dst,
 	 return;
       }
    }
-   if ((op == GL_DOT4_ATI) &&
+   if ((optype == ATI_FRAGMENT_SHADER_COLOR_OP) && (op == GL_DOT4_ATI) &&
       (((arg1 == GL_SECONDARY_INTERPOLATOR_ATI) && ((arg1Rep == GL_ALPHA) || (arg1Rep == GL_NONE))) ||
       (((arg2 == GL_SECONDARY_INTERPOLATOR_ATI) && ((arg2Rep == GL_ALPHA) || (arg2Rep == GL_NONE)))))) {
-      _mesa_error(ctx, GL_INVALID_OPERATION, "C/AFragmentOpATI(sec_interp)");
+      _mesa_error(ctx, GL_INVALID_OPERATION, "C/AFragmentOpATI(sec_interpDOT4)");
+      return;
    }
 
    if (!check_arith_arg(curProg, optype, arg1, arg1Rep)) {
-- 
2.15.0.rc0