1 files changed, 77 insertions, 21 deletions

diff --git a/mesalib/src/glsl/ast_to_hir.cpp b/mesalib/src/glsl/ast_to_hir.cpp
index 49093d88f..92065f5b7 100644
--- a/mesalib/src/glsl/ast_to_hir.cpp
+++ b/mesalib/src/glsl/ast_to_hir.cpp
@@ -2821,30 +2821,46 @@ ast_declarator_list::hir(exec_list *instructions,
 	 }
       }
 
-      /* Integer vertex outputs must be qualified with 'flat'.
+      /* Integer fragment inputs must be qualified with 'flat'.  In GLSL ES,
+       * so must integer vertex outputs.
        *
-       * From section 4.3.6 of the GLSL 1.30 spec:
-       *    "If a vertex output is a signed or unsigned integer or integer
-       *    vector, then it must be qualified with the interpolation qualifier
-       *    flat."
-       *
-       * From section 4.3.4 of the GLSL 3.00 ES spec:
+       * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
        *    "Fragment shader inputs that are signed or unsigned integers or
        *    integer vectors must be qualified with the interpolation qualifier
        *    flat."
        *
-       * Since vertex outputs and fragment inputs must have matching
-       * qualifiers, these two requirements are equivalent.
+       * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
+       *    "Fragment shader inputs that are, or contain, signed or unsigned
+       *    integers or integer vectors must be qualified with the
+       *    interpolation qualifier flat."
+       *
+       * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
+       *    "Vertex shader outputs that are, or contain, signed or unsigned
+       *    integers or integer vectors must be qualified with the
+       *    interpolation qualifier flat."
+       *
+       * Note that prior to GLSL 1.50, this requirement applied to vertex
+       * outputs rather than fragment inputs.  That creates problems in the
+       * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
+       * desktop GL shaders.  For GLSL ES shaders, we follow the spec and
+       * apply the restriction to both vertex outputs and fragment inputs.
+       *
+       * Note also that the desktop GLSL specs are missing the text "or
+       * contain"; this is presumably an oversight, since there is no
+       * reasonable way to interpolate a fragment shader input that contains
+       * an integer.
        */
-      if (state->is_version(130, 300)
-          && state->target == vertex_shader
-          && state->current_function == NULL
-          && var->type->is_integer()
-          && var->mode == ir_var_shader_out
-          && var->interpolation != INTERP_QUALIFIER_FLAT) {
-
-         _mesa_glsl_error(&loc, state, "If a vertex output is an integer, "
-                          "then it must be qualified with 'flat'");
+      if (state->is_version(130, 300) &&
+          var->type->contains_integer() &&
+          var->interpolation != INTERP_QUALIFIER_FLAT &&
+          ((state->target == fragment_shader && var->mode == ir_var_shader_in)
+           || (state->target == vertex_shader && var->mode == ir_var_shader_out
+               && state->es_shader))) {
+         const char *var_type = (state->target == vertex_shader) ?
+            "vertex output" : "fragment input";
+         _mesa_glsl_error(&loc, state, "If a %s is (or contains) "
+                          "an integer, then it must be qualified with 'flat'",
+                          var_type);
       }
 
 
@@ -3967,6 +3983,47 @@ ast_iteration_statement::hir(exec_list *instructions,
 }
 
 
+/**
+ * Determine if the given type is valid for establishing a default precision
+ * qualifier.
+ *
+ * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
+ *
+ *     "The precision statement
+ *
+ *         precision precision-qualifier type;
+ *
+ *     can be used to establish a default precision qualifier. The type field
+ *     can be either int or float or any of the sampler types, and the
+ *     precision-qualifier can be lowp, mediump, or highp."
+ *
+ * GLSL ES 1.00 has similar language.  GLSL 1.30 doesn't allow precision
+ * qualifiers on sampler types, but this seems like an oversight (since the
+ * intention of including these in GLSL 1.30 is to allow compatibility with ES
+ * shaders).  So we allow int, float, and all sampler types regardless of GLSL
+ * version.
+ */
+static bool
+is_valid_default_precision_type(const struct _mesa_glsl_parse_state *state,
+                                const char *type_name)
+{
+   const struct glsl_type *type = state->symbols->get_type(type_name);
+   if (type == NULL)
+      return false;
+
+   switch (type->base_type) {
+   case GLSL_TYPE_INT:
+   case GLSL_TYPE_FLOAT:
+      /* "int" and "float" are valid, but vectors and matrices are not. */
+      return type->vector_elements == 1 && type->matrix_columns == 1;
+   case GLSL_TYPE_SAMPLER:
+      return true;
+   default:
+      return false;
+   }
+}
+
+
 ir_rvalue *
 ast_type_specifier::hir(exec_list *instructions,
 			  struct _mesa_glsl_parse_state *state)
@@ -4007,11 +4064,10 @@ ast_type_specifier::hir(exec_list *instructions,
                           "arrays");
          return NULL;
       }
-      if (strcmp(this->type_name, "float") != 0 &&
-	  strcmp(this->type_name, "int") != 0) {
+      if (!is_valid_default_precision_type(state, this->type_name)) {
          _mesa_glsl_error(&loc, state,
                           "default precision statements apply only to types "
-                          "float and int");
+                          "float, int, and sampler types");
          return NULL;
       }