glsl: Return -1 for program interface query locations in many cases.

We were recording locations for all variables, even ones without an
explicit location set.  Implement the rules from the spec, and record
-1 in the resource list accordngly.  Make program_resource_location
stop doing math on negative values.  Remove hacks that are no longer
necessary now that we've stopped doing that.

Fixes 4 dEQP-GLES31.functional.program_interface_query tests:
- program_input.location.separable_fragment.var
- program_input.location.separable_fragment.var_array
- program_output.location.separable_vertex.var_array
- program_output.location.separable_vertex.var_array

v2: Delete more code

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Timothy Arceri <timothy.arceri@collabora.com>

1 files changed, 9 insertions, 53 deletions

diff --git a/src/mesa/main/shader_query.cpp b/src/mesa/main/shader_query.cpp
index caff79f..190f638 100644
--- a/src/mesa/main/shader_query.cpp
+++ b/src/mesa/main/shader_query.cpp
@@ -101,24 +101,6 @@ _mesa_BindAttribLocation(GLuint program, GLuint index,
     */
 }
 
-static bool
-is_active_attrib(const gl_shader_variable *var)
-{
-   if (!var)
-      return false;
-
-   switch (var->mode) {
-   case ir_var_shader_in:
-      return var->location != -1;
-
-   case ir_var_system_value:
-      return true;
-
-   default:
-      return false;
-   }
-}
-
 void GLAPIENTRY
 _mesa_GetActiveAttrib(GLuint program, GLuint desired_index,
                       GLsizei maxLength, GLsizei * length, GLint * size,
@@ -159,9 +141,6 @@ _mesa_GetActiveAttrib(GLuint program, GLuint desired_index,
 
    const gl_shader_variable *const var = RESOURCE_VAR(res);
 
-   if (!is_active_attrib(var))
-      return;
-
    const char *var_name = var->name;
 
    _mesa_copy_string(name, maxLength, length, var_name);
@@ -208,19 +187,7 @@ _mesa_GetAttribLocation(GLuint program, const GLchar * name)
    if (!res)
       return -1;
 
-   GLint loc = program_resource_location(shProg, res, name, array_index);
-
-   /* The extra check against against 0 is made because of builtin-attribute
-    * locations that have offset applied. Function program_resource_location
-    * can return built-in attribute locations < 0 and glGetAttribLocation
-    * cannot be used on "conventional" attributes.
-    *
-    * From page 95 of the OpenGL 3.0 spec:
-    *
-    *     "If name is not an active attribute, if name is a conventional
-    *     attribute, or if an error occurs, -1 will be returned."
-    */
-   return (loc >= 0) ? loc : -1;
+   return program_resource_location(shProg, res, name, array_index);
 }
 
 unsigned
@@ -235,8 +202,7 @@ _mesa_count_active_attribs(struct gl_shader_program *shProg)
    unsigned count = 0;
    for (unsigned j = 0; j < shProg->NumProgramResourceList; j++, res++) {
       if (res->Type == GL_PROGRAM_INPUT &&
-          res->StageReferences & (1 << MESA_SHADER_VERTEX) &&
-          is_active_attrib(RESOURCE_VAR(res)))
+          res->StageReferences & (1 << MESA_SHADER_VERTEX))
          count++;
    }
    return count;
@@ -394,19 +360,7 @@ _mesa_GetFragDataLocation(GLuint program, const GLchar *name)
    if (!res)
       return -1;
 
-   GLint loc = program_resource_location(shProg, res, name, array_index);
-
-   /* The extra check against against 0 is made because of builtin-attribute
-    * locations that have offset applied. Function program_resource_location
-    * can return built-in attribute locations < 0 and glGetFragDataLocation
-    * cannot be used on "conventional" attributes.
-    *
-    * From page 95 of the OpenGL 3.0 spec:
-    *
-    *     "If name is not an active attribute, if name is a conventional
-    *     attribute, or if an error occurs, -1 will be returned."
-    */
-   return (loc >= 0) ? loc : -1;
+   return program_resource_location(shProg, res, name, array_index);
 }
 
 const char*
@@ -826,10 +780,6 @@ program_resource_location(struct gl_shader_program *shProg,
                           struct gl_program_resource *res, const char *name,
                           unsigned array_index)
 {
-   /* Built-in locations should report GL_INVALID_INDEX. */
-   if (is_gl_identifier(name))
-      return GL_INVALID_INDEX;
-
    /* VERT_ATTRIB_GENERIC0 and FRAG_RESULT_DATA0 are decremented as these
     * offsets are used internally to differentiate between built-in attributes
     * and user-defined attributes.
@@ -838,6 +788,9 @@ program_resource_location(struct gl_shader_program *shProg,
    case GL_PROGRAM_INPUT: {
       const gl_shader_variable *var = RESOURCE_VAR(res);
 
+      if (var->location == -1)
+         return -1;
+
       /* If the input is an array, fail if the index is out of bounds. */
       if (array_index > 0
           && array_index >= var->type->length) {
@@ -848,6 +801,9 @@ program_resource_location(struct gl_shader_program *shProg,
 	      VERT_ATTRIB_GENERIC0);
    }
    case GL_PROGRAM_OUTPUT:
+      if (RESOURCE_VAR(res)->location == -1)
+         return -1;
+
       /* If the output is an array, fail if the index is out of bounds. */
       if (array_index > 0
           && array_index >= RESOURCE_VAR(res)->type->length) {