[Mesa-dev] [PATCH v2 36/82] glsl: add support for unsized arrays in shader storage blocks
Iago Toral Quiroga
itoral at igalia.com
Wed Jun 3 00:01:26 PDT 2015
From: Samuel Iglesias Gonsalvez <siglesias at igalia.com>
They only can be defined in the last position of the shader
storage blocks.
When an unsized array is used in different shaders, it might be
converted in different sized arrays, avoid get a linker error
in that case.
Signed-off-by: Samuel Iglesias Gonsalvez <siglesias at igalia.com>
---
src/glsl/ast_array_index.cpp | 6 +--
src/glsl/ast_to_hir.cpp | 32 +++++++++++++
src/glsl/ir.cpp | 1 +
src/glsl/ir.h | 14 ++++++
src/glsl/linker.cpp | 107 ++++++++++++++++++++++++++++---------------
5 files changed, 121 insertions(+), 39 deletions(-)
diff --git a/src/glsl/ast_array_index.cpp b/src/glsl/ast_array_index.cpp
index 752d86f..481efae 100644
--- a/src/glsl/ast_array_index.cpp
+++ b/src/glsl/ast_array_index.cpp
@@ -106,7 +106,6 @@ update_max_array_access(ir_rvalue *ir, int idx, YYLTYPE *loc,
}
}
-
ir_rvalue *
_mesa_ast_array_index_to_hir(void *mem_ctx,
struct _mesa_glsl_parse_state *state,
@@ -182,8 +181,9 @@ _mesa_ast_array_index_to_hir(void *mem_ctx,
if (array->type->is_array())
update_max_array_access(array, idx, &loc, state);
} else if (const_index == NULL && array->type->is_array()) {
- if (array->type->is_unsized_array()) {
- _mesa_glsl_error(&loc, state, "unsized array index must be constant");
+ if (array->type->is_unsized_array() &&
+ array->variable_referenced()->data.mode != ir_var_shader_storage) {
+ _mesa_glsl_error(&loc, state, "unsized array index must be constant");
} else if (array->type->fields.array->is_interface()
&& array->variable_referenced()->data.mode == ir_var_uniform
&& !state->is_version(400, 0) && !state->ARB_gpu_shader5_enable) {
diff --git a/src/glsl/ast_to_hir.cpp b/src/glsl/ast_to_hir.cpp
index e1e5ca9..3ec28dd 100644
--- a/src/glsl/ast_to_hir.cpp
+++ b/src/glsl/ast_to_hir.cpp
@@ -5507,6 +5507,19 @@ private:
bool found;
};
+static bool
+is_unsized_array_last_element(ir_variable *v)
+{
+ const glsl_type *interface_type = v->get_interface_type();
+ int length = interface_type->length;
+
+ assert(v->type->is_unsized_array());
+
+ /* Check if it is the last element of the interface */
+ if (strcmp(interface_type->fields.structure[length-1].name, v->name) == 0)
+ return true;
+ return false;
+}
ir_rvalue *
ast_interface_block::hir(exec_list *instructions,
@@ -5828,6 +5841,15 @@ ast_interface_block::hir(exec_list *instructions,
var->data.explicit_binding = this->layout.flags.q.explicit_binding;
var->data.binding = this->layout.binding;
+ if (var->is_in_shader_storage_block() && var->type->is_unsized_array()) {
+ var->data.from_ssbo_unsized_array = true;
+ if (!is_unsized_array_last_element(var)) {
+ _mesa_glsl_error(&loc, state, "unsized array `%s' should be the"
+ " last member of a shader storage block",
+ var->name);
+ }
+ }
+
state->symbols->add_variable(var);
instructions->push_tail(var);
}
@@ -5900,6 +5922,16 @@ ast_interface_block::hir(exec_list *instructions,
var->data.explicit_binding = this->layout.flags.q.explicit_binding;
var->data.binding = this->layout.binding;
+ if (var->data.mode == ir_var_shader_storage && var->type->is_unsized_array()) {
+ var->data.from_ssbo_unsized_array = true;
+ if (var->is_in_shader_storage_block() &&
+ !is_unsized_array_last_element(var)) {
+ _mesa_glsl_error(&loc, state, "unsized array `%s' should be the"
+ " last member of a shader storage block",
+ var->name);
+ }
+ }
+
state->symbols->add_variable(var);
instructions->push_tail(var);
}
diff --git a/src/glsl/ir.cpp b/src/glsl/ir.cpp
index 5a02523..1aef894 100644
--- a/src/glsl/ir.cpp
+++ b/src/glsl/ir.cpp
@@ -1655,6 +1655,7 @@ ir_variable::ir_variable(const struct glsl_type *type, const char *name,
this->data.image_coherent = false;
this->data.image_volatile = false;
this->data.image_restrict = false;
+ this->data.from_ssbo_unsized_array = false;
if (type != NULL) {
if (type->base_type == GLSL_TYPE_SAMPLER)
diff --git a/src/glsl/ir.h b/src/glsl/ir.h
index 2a0b28c..662fd27 100644
--- a/src/glsl/ir.h
+++ b/src/glsl/ir.h
@@ -452,6 +452,15 @@ public:
}
/**
+ * Determine whether or not a variable is part of a shader storage block.
+ */
+ inline bool is_in_shader_storage_block() const
+ {
+ return this->data.mode == ir_var_shader_storage &&
+ this->interface_type != NULL;
+ }
+
+ /**
* Determine whether or not a variable is the declaration of an interface
* block
*
@@ -776,6 +785,11 @@ public:
unsigned image_restrict:1;
/**
+ * ARB_shader_storage_buffer_object
+ */
+ unsigned from_ssbo_unsized_array:1; /**< unsized array buffer variable. */
+
+ /**
* Emit a warning if this variable is accessed.
*/
private:
diff --git a/src/glsl/linker.cpp b/src/glsl/linker.cpp
index 786f036..c188005 100644
--- a/src/glsl/linker.cpp
+++ b/src/glsl/linker.cpp
@@ -691,30 +691,40 @@ validate_intrastage_arrays(struct gl_shader_program *prog,
* In addition, set the type of the linked variable to the
* explicitly sized array.
*/
- if (var->type->is_array() && existing->type->is_array() &&
- (var->type->fields.array == existing->type->fields.array) &&
- ((var->type->length == 0)|| (existing->type->length == 0))) {
- if (var->type->length != 0) {
- if (var->type->length <= existing->data.max_array_access) {
- linker_error(prog, "%s `%s' declared as type "
- "`%s' but outermost dimension has an index"
- " of `%i'\n",
- mode_string(var),
- var->name, var->type->name,
- existing->data.max_array_access);
- }
- existing->type = var->type;
- return true;
- } else if (existing->type->length != 0) {
- if(existing->type->length <= var->data.max_array_access) {
- linker_error(prog, "%s `%s' declared as type "
- "`%s' but outermost dimension has an index"
- " of `%i'\n",
- mode_string(var),
- var->name, existing->type->name,
- var->data.max_array_access);
+ if (var->type->is_array() && existing->type->is_array()) {
+ if ((var->type->fields.array == existing->type->fields.array) &&
+ ((var->type->length == 0)|| (existing->type->length == 0))) {
+ if (var->type->length != 0) {
+ if (var->type->length <= existing->data.max_array_access) {
+ linker_error(prog, "%s `%s' declared as type "
+ "`%s' but outermost dimension has an index"
+ " of `%i'\n",
+ mode_string(var),
+ var->name, var->type->name,
+ existing->data.max_array_access);
+ }
+ existing->type = var->type;
+ return true;
+ } else if (existing->type->length != 0) {
+ if(existing->type->length <= var->data.max_array_access &&
+ !existing->data.from_ssbo_unsized_array) {
+ linker_error(prog, "%s `%s' declared as type "
+ "`%s' but outermost dimension has an index"
+ " of `%i'\n",
+ mode_string(var),
+ var->name, existing->type->name,
+ var->data.max_array_access);
+ }
+ return true;
}
- return true;
+ } else {
+ /* The arrays of structs could have different glsl_type pointers but
+ * they are actually the same type. Use record_compare() to check that.
+ */
+ if (existing->type->fields.array->is_record() &&
+ var->type->fields.array->is_record() &&
+ existing->type->fields.array->record_compare(var->type->fields.array))
+ return true;
}
}
return false;
@@ -769,12 +779,24 @@ cross_validate_globals(struct gl_shader_program *prog,
&& existing->type->record_compare(var->type)) {
existing->type = var->type;
} else {
- linker_error(prog, "%s `%s' declared as type "
- "`%s' and type `%s'\n",
- mode_string(var),
- var->name, var->type->name,
- existing->type->name);
- return;
+ /* If it is an unsized array in a Shader Storage Block,
+ * two different shaders can access to different elements.
+ * Because of that, they might be converted to different
+ * sized arrays, then check that they are compatible but
+ * forget about the array size.
+ */
+ if (!(var->data.mode == ir_var_shader_storage &&
+ var->data.from_ssbo_unsized_array &&
+ existing->data.mode == ir_var_shader_storage &&
+ existing->data.from_ssbo_unsized_array &&
+ var->type->gl_type == existing->type->gl_type)) {
+ linker_error(prog, "%s `%s' declared as type "
+ "`%s' and type `%s'\n",
+ mode_string(var),
+ var->name, var->type->name,
+ existing->type->name);
+ return;
+ }
}
}
}
@@ -1201,12 +1223,14 @@ public:
virtual ir_visitor_status visit(ir_variable *var)
{
- fixup_type(&var->type, var->data.max_array_access);
+ fixup_type(&var->type, var->data.max_array_access,
+ var->data.from_ssbo_unsized_array);
if (var->type->is_interface()) {
if (interface_contains_unsized_arrays(var->type)) {
const glsl_type *new_type =
resize_interface_members(var->type,
- var->get_max_ifc_array_access());
+ var->get_max_ifc_array_access(),
+ var->is_in_shader_storage_block());
var->type = new_type;
var->change_interface_type(new_type);
}
@@ -1215,7 +1239,8 @@ public:
if (interface_contains_unsized_arrays(var->type->fields.array)) {
const glsl_type *new_type =
resize_interface_members(var->type->fields.array,
- var->get_max_ifc_array_access());
+ var->get_max_ifc_array_access(),
+ var->is_in_shader_storage_block());
var->change_interface_type(new_type);
var->type =
glsl_type::get_array_instance(new_type, var->type->length);
@@ -1257,9 +1282,10 @@ private:
* If the type pointed to by \c type represents an unsized array, replace
* it with a sized array whose size is determined by max_array_access.
*/
- static void fixup_type(const glsl_type **type, unsigned max_array_access)
+ static void fixup_type(const glsl_type **type, unsigned max_array_access,
+ bool from_ssbo_unsized_array)
{
- if ((*type)->is_unsized_array()) {
+ if (!from_ssbo_unsized_array && (*type)->is_unsized_array()) {
*type = glsl_type::get_array_instance((*type)->fields.array,
max_array_access + 1);
assert(*type != NULL);
@@ -1287,14 +1313,23 @@ private:
*/
static const glsl_type *
resize_interface_members(const glsl_type *type,
- const unsigned *max_ifc_array_access)
+ const unsigned *max_ifc_array_access,
+ bool is_ssbo)
{
unsigned num_fields = type->length;
glsl_struct_field *fields = new glsl_struct_field[num_fields];
memcpy(fields, type->fields.structure,
num_fields * sizeof(*fields));
for (unsigned i = 0; i < num_fields; i++) {
- fixup_type(&fields[i].type, max_ifc_array_access[i]);
+ /* If SSBO last member is unsized array, we don't replace it by a sized
+ * array.
+ */
+ if (is_ssbo && i == (num_fields - 1))
+ fixup_type(&fields[i].type, max_ifc_array_access[i],
+ true);
+ else
+ fixup_type(&fields[i].type, max_ifc_array_access[i],
+ false);
}
glsl_interface_packing packing =
(glsl_interface_packing) type->interface_packing;
--
1.9.1
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