glsl: Drop the ES requirement that VS outputs must be flat qualified.

Several conformance tests violate this requirement:

ES31-CTS.core.tessellation_shader.max_patch_vertices
ES31-CTS.core.tessellation_shader.tessellation_control_to_tessellation_evaluation.data_pass_through

I submitted a merge request to fix the conformance tests, but Khronos
opted to drop this GLSL ES specific requirement in favor of making flat
qualification of VS outputs optional, matching modern desktop GL.

Note that there were 7 Piglit tests which enforce this rule:
tests/spec/glsl-es-3.00/compiler/interpolation/qualifiers/*nonflat*
but these were deleted in Piglit commit acc0a2fabbd714bc704c16f1675e7c0.

Bugzilla: https://cvs.khronos.org/bugzilla/show_bug.cgi?id=15465#c7
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Timothy Arceri <timothy.arceri@collabora.com>

diff --git a/src/compiler/glsl/ast_to_hir.cpp b/src/compiler/glsl/ast_to_hir.cpp
index c3c8cef327736a5f0c1ceb4ca61656a5754767dc..6e2f253a77da829d0bbb03c5f3cdf7da42bf77b3 100644 (file)
--- a/src/compiler/glsl/ast_to_hir.cpp
+++ b/src/compiler/glsl/ast_to_hir.cpp
@@ -2986,14 +2986,10 @@ validate_interpolation_qualifier(struct _mesa_glsl_parse_state *state,
    if (state->is_version(130, 300)
        && var_type->contains_integer()
        && interpolation != INTERP_MODE_FLAT
-       && ((state->stage == MESA_SHADER_FRAGMENT && mode == ir_var_shader_in)
-           || (state->stage == MESA_SHADER_VERTEX && mode == ir_var_shader_out
-               && state->es_shader))) {
-      const char *shader_var_type = (state->stage == MESA_SHADER_VERTEX) ?
-         "vertex output" : "fragment input";
-      _mesa_glsl_error(loc, state, "if a %s is (or contains) "
-                       "an integer, then it must be qualified with 'flat'",
-                       shader_var_type);
+       && state->stage == MESA_SHADER_FRAGMENT
+       && mode == ir_var_shader_in) {
+      _mesa_glsl_error(loc, state, "if a fragment input is (or contains) "
+                       "an integer, then it must be qualified with 'flat'");
    }
 
    /* Double fragment inputs must be qualified with 'flat'.