[Mesa-dev] [PATCH v5 28/70] glsl: add std430 interface packing support to ssbo related operations

Samuel Iglesias Gonsálvez siglesias at igalia.com
Mon Sep 21 00:21:04 PDT 2015



On 18/09/15 21:04, Kristian Høgsberg wrote:
> On Thu, Sep 10, 2015 at 03:35:44PM +0200, Iago Toral Quiroga wrote:
>> From: Samuel Iglesias Gonsalvez <siglesias at igalia.com>
>>
>> v2:
>> - Get interface packing information from interface's type, not the variable type.
>> - Simplify is_std430 condition in emit_access() for readability (Jordan)
>> - Add a commment explaing why array of three-component vector case is different
>>   in std430 than the rest of cases.
>> - Add calls to std430_array_stride().
>>
>> Signed-off-by: Samuel Iglesias Gonsalvez <siglesias at igalia.com>
>> ---
>>  src/glsl/lower_ubo_reference.cpp | 102 ++++++++++++++++++++++++++++++---------
>>  1 file changed, 78 insertions(+), 24 deletions(-)
>>
>> diff --git a/src/glsl/lower_ubo_reference.cpp b/src/glsl/lower_ubo_reference.cpp
>> index 8694383..7e45a26 100644
>> --- a/src/glsl/lower_ubo_reference.cpp
>> +++ b/src/glsl/lower_ubo_reference.cpp
>> @@ -147,7 +147,8 @@ public:
>>                                  ir_rvalue **offset,
>>                                  unsigned *const_offset,
>>                                  bool *row_major,
>> -                                int *matrix_columns);
>> +                                int *matrix_columns,
>> +                                unsigned packing);
>>     ir_expression *ubo_load(const struct glsl_type *type,
>>  			   ir_rvalue *offset);
>>     ir_call *ssbo_load(const struct glsl_type *type,
>> @@ -164,7 +165,7 @@ public:
>>     void emit_access(bool is_write, ir_dereference *deref,
>>                      ir_variable *base_offset, unsigned int deref_offset,
>>                      bool row_major, int matrix_columns,
>> -                    unsigned write_mask);
>> +                    bool is_std430, unsigned write_mask);
>>  
>>     ir_visitor_status visit_enter(class ir_expression *);
>>     ir_expression *calculate_ssbo_unsized_array_length(ir_expression *expr);
>> @@ -176,7 +177,8 @@ public:
>>                                                      ir_variable *);
>>     ir_expression *emit_ssbo_get_buffer_size();
>>  
>> -   unsigned calculate_unsized_array_stride(ir_dereference *deref);
>> +   unsigned calculate_unsized_array_stride(ir_dereference *deref,
>> +                                           unsigned packing);
>>  
>>     void *mem_ctx;
>>     struct gl_shader *shader;
>> @@ -257,7 +259,8 @@ lower_ubo_reference_visitor::setup_for_load_or_store(ir_variable *var,
>>                                                       ir_rvalue **offset,
>>                                                       unsigned *const_offset,
>>                                                       bool *row_major,
>> -                                                     int *matrix_columns)
>> +                                                     int *matrix_columns,
>> +                                                     unsigned packing)
>>  {
>>     /* Determine the name of the interface block */
>>     ir_rvalue *nonconst_block_index;
>> @@ -343,8 +346,15 @@ lower_ubo_reference_visitor::setup_for_load_or_store(ir_variable *var,
>>              const bool array_row_major =
>>                 is_dereferenced_thing_row_major(deref_array);
>>  
>> -            array_stride = deref_array->type->std140_size(array_row_major);
>> -            array_stride = glsl_align(array_stride, 16);
>> +            /* The array type will give the correct interface packing
>> +             * information
>> +             */
>> +            if (packing == GLSL_INTERFACE_PACKING_STD430) {
>> +               array_stride = deref_array->type->std430_array_stride(array_row_major);
>> +            } else {
>> +               array_stride = deref_array->type->std140_size(array_row_major);
>> +               array_stride = glsl_align(array_stride, 16);
>> +            }
>>           }
>>  
>>           ir_rvalue *array_index = deref_array->array_index;
>> @@ -380,7 +390,12 @@ lower_ubo_reference_visitor::setup_for_load_or_store(ir_variable *var,
>>  
>>              ralloc_free(field_deref);
>>  
>> -            unsigned field_align = type->std140_base_alignment(field_row_major);
>> +            unsigned field_align = 0;
>> +
>> +            if (packing == GLSL_INTERFACE_PACKING_STD430)
>> +               field_align = type->std430_base_alignment(field_row_major);
>> +            else
>> +               field_align = type->std140_base_alignment(field_row_major);
>>  
>>              intra_struct_offset = glsl_align(intra_struct_offset, field_align);
>>  
>> @@ -388,7 +403,10 @@ lower_ubo_reference_visitor::setup_for_load_or_store(ir_variable *var,
>>                         deref_record->field) == 0)
>>                 break;
>>  
>> -            intra_struct_offset += type->std140_size(field_row_major);
>> +            if (packing == GLSL_INTERFACE_PACKING_STD430)
>> +               intra_struct_offset += type->std430_size(field_row_major);
>> +            else
>> +               intra_struct_offset += type->std140_size(field_row_major);
>>  
>>              /* If the field just examined was itself a structure, apply rule
>>               * #9:
>> @@ -437,13 +455,15 @@ lower_ubo_reference_visitor::handle_rvalue(ir_rvalue **rvalue)
>>     unsigned const_offset;
>>     bool row_major;
>>     int matrix_columns;
>> +   unsigned packing = var->get_interface_type()->interface_packing;
>>  
>>     /* Compute the offset to the start if the dereference as well as other
>>      * information we need to configure the write
>>      */
>>     setup_for_load_or_store(var, deref,
>>                             &offset, &const_offset,
>> -                           &row_major, &matrix_columns);
>> +                           &row_major, &matrix_columns,
>> +                           packing);
>>     assert(offset);
>>  
>>     /* Now that we've calculated the offset to the start of the
>> @@ -463,7 +483,7 @@ lower_ubo_reference_visitor::handle_rvalue(ir_rvalue **rvalue)
>>  
>>     deref = new(mem_ctx) ir_dereference_variable(load_var);
>>     emit_access(false, deref, load_offset, const_offset,
>> -               row_major, matrix_columns, 0);
>> +               row_major, matrix_columns, false, 0);
> 
> Why are we passing false for is_std430 here?  We use handle_rvalue for
> both UBO and SSBO loads, right?  Also, for consistency, I'd prefer if
> we could just pass 'packing' around instead of is_std430.
> 
> Kristian
> 

This is a mistake. I will fix it and also pass 'packing' instead of
'is_std430'.

Thanks,

Sam

>>     *rvalue = deref;
>>  
>>     progress = true;
>> @@ -581,6 +601,7 @@ lower_ubo_reference_visitor::emit_access(bool is_write,
>>                                           unsigned int deref_offset,
>>                                           bool row_major,
>>                                           int matrix_columns,
>> +                                         bool is_std430,
>>                                           unsigned write_mask)
>>  {
>>     if (deref->type->is_record()) {
>> @@ -599,7 +620,7 @@ lower_ubo_reference_visitor::emit_access(bool is_write,
>>  
>>           emit_access(is_write, field_deref, base_offset,
>>                       deref_offset + field_offset,
>> -                     row_major, 1,
>> +                     row_major, 1, is_std430,
>>                       writemask_for_size(field_deref->type->vector_elements));
>>  
>>           field_offset += field->type->std140_size(row_major);
>> @@ -608,7 +629,8 @@ lower_ubo_reference_visitor::emit_access(bool is_write,
>>     }
>>  
>>     if (deref->type->is_array()) {
>> -      unsigned array_stride =
>> +      unsigned array_stride = is_std430 ?
>> +         deref->type->fields.array->std430_array_stride(row_major) :
>>           glsl_align(deref->type->fields.array->std140_size(row_major), 16);
>>  
>>        for (unsigned i = 0; i < deref->type->length; i++) {
>> @@ -618,7 +640,7 @@ lower_ubo_reference_visitor::emit_access(bool is_write,
>>                                                element);
>>           emit_access(is_write, element_deref, base_offset,
>>                       deref_offset + i * array_stride,
>> -                     row_major, 1,
>> +                     row_major, 1, is_std430,
>>                       writemask_for_size(element_deref->type->vector_elements));
>>        }
>>        return;
>> @@ -637,7 +659,7 @@ lower_ubo_reference_visitor::emit_access(bool is_write,
>>              int size_mul = deref->type->is_double() ? 8 : 4;
>>              emit_access(is_write, col_deref, base_offset,
>>                          deref_offset + i * size_mul,
>> -                        row_major, deref->type->matrix_columns,
>> +                        row_major, deref->type->matrix_columns, is_std430,
>>                          writemask_for_size(col_deref->type->vector_elements));
>>           } else {
>>              /* std140 always rounds the stride of arrays (and matrices) to a
>> @@ -646,9 +668,26 @@ lower_ubo_reference_visitor::emit_access(bool is_write,
>>               */
>>              int size_mul = (deref->type->is_double() &&
>>                              deref->type->vector_elements > 2) ? 32 : 16;
>> +
>> +            /* std430 doesn't round up to a vec4 */
>> +            if (is_std430) {
>> +               if (deref->type->vector_elements <= 2) {
>> +                  size_mul = deref->type->is_double() ?
>> +                     8 * deref->type->vector_elements :
>> +                     4 * deref->type->vector_elements;
>> +               } else {
>> +                  /* If the member is a three-component vector with components
>> +                   * consuming N basic machine units, the base alignment is 4N.
>> +                   * For vec4, base alignment is 4N.
>> +                   */
>> +                  size_mul = (deref->type->is_double() &&
>> +                              deref->type->vector_elements > 2) ? 32 : 16;
>> +               }
>> +            }
>> +
>>              emit_access(is_write, col_deref, base_offset,
>>                          deref_offset + i * size_mul,
>> -                        row_major, deref->type->matrix_columns,
>> +                        row_major, deref->type->matrix_columns, is_std430,
>>                          writemask_for_size(col_deref->type->vector_elements));
>>           }
>>        }
>> @@ -727,13 +766,16 @@ lower_ubo_reference_visitor::write_to_memory(ir_dereference *deref,
>>     unsigned const_offset;
>>     bool row_major;
>>     int matrix_columns;
>> +   unsigned packing = var->get_interface_type()->interface_packing;
>> +   bool is_std430 = packing == GLSL_INTERFACE_PACKING_STD430;
>>  
>>     /* Compute the offset to the start if the dereference as well as other
>>      * information we need to configure the write
>>      */
>>     setup_for_load_or_store(var, deref,
>>                             &offset, &const_offset,
>> -                           &row_major, &matrix_columns);
>> +                           &row_major, &matrix_columns,
>> +                           packing);
>>     assert(offset);
>>  
>>     /* Now emit writes from the temporary to memory */
>> @@ -747,7 +789,7 @@ lower_ubo_reference_visitor::write_to_memory(ir_dereference *deref,
>>  
>>     deref = new(mem_ctx) ir_dereference_variable(write_var);
>>     emit_access(true, deref, write_offset, const_offset,
>> -               row_major, matrix_columns, write_mask);
>> +               row_major, matrix_columns, is_std430, write_mask);
>>  }
>>  
>>  ir_visitor_status
>> @@ -830,7 +872,8 @@ lower_ubo_reference_visitor::emit_ssbo_get_buffer_size()
>>  }
>>  
>>  unsigned
>> -lower_ubo_reference_visitor::calculate_unsized_array_stride(ir_dereference *deref)
>> +lower_ubo_reference_visitor::calculate_unsized_array_stride(ir_dereference *deref,
>> +                                                            unsigned packing)
>>  {
>>     unsigned array_stride = 0;
>>  
>> @@ -852,8 +895,12 @@ lower_ubo_reference_visitor::calculate_unsized_array_stride(ir_dereference *dere
>>        const bool array_row_major =
>>           is_dereferenced_thing_row_major(deref_var);
>>  
>> -      array_stride = unsized_array_type->std140_size(array_row_major);
>> -      array_stride = glsl_align(array_stride, 16);
>> +      if (packing == GLSL_INTERFACE_PACKING_STD430) {
>> +         array_stride = unsized_array_type->std430_array_stride(array_row_major);
>> +      } else {
>> +         array_stride = unsized_array_type->std140_size(array_row_major);
>> +         array_stride = glsl_align(array_stride, 16);
>> +      }
>>        break;
>>     }
>>     case ir_type_dereference_record:
>> @@ -868,8 +915,13 @@ lower_ubo_reference_visitor::calculate_unsized_array_stride(ir_dereference *dere
>>  
>>        const bool array_row_major =
>>           is_dereferenced_thing_row_major(deref_record);
>> -      array_stride = unsized_array_type->std140_size(array_row_major);
>> -      array_stride = glsl_align(array_stride, 16);
>> +
>> +      if (packing == GLSL_INTERFACE_PACKING_STD430) {
>> +         array_stride = unsized_array_type->std430_array_stride(array_row_major);
>> +      } else {
>> +         array_stride = unsized_array_type->std140_size(array_row_major);
>> +         array_stride = glsl_align(array_stride, 16);
>> +      }
>>        break;
>>     }
>>     default:
>> @@ -889,14 +941,16 @@ lower_ubo_reference_visitor::process_ssbo_unsized_array_length(ir_rvalue **rvalu
>>     unsigned const_offset;
>>     bool row_major;
>>     int matrix_columns;
>> -   int unsized_array_stride = calculate_unsized_array_stride(deref);
>> +   unsigned packing = var->get_interface_type()->interface_packing;
>> +   int unsized_array_stride = calculate_unsized_array_stride(deref, packing);
>>  
>>     /* Compute the offset to the start if the dereference as well as other
>>      * information we need to calculate the length.
>>      */
>>     setup_for_load_or_store(var, deref,
>>                             &base_offset, &const_offset,
>> -                           &row_major, &matrix_columns);
>> +                           &row_major, &matrix_columns,
>> +                           packing);
>>     /* array.length() =
>>      *  max((buffer_object_size - offset_of_array) / stride_of_array, 0)
>>      */
>> -- 
>> 1.9.1
>>
> 


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