Mesa (master): glsl: link uniform block arrays of arrays
Timothy Arceri
tarceri at kemper.freedesktop.org
Thu Oct 15 10:43:38 UTC 2015
Module: Mesa
Branch: master
Commit: 8cf1333b189b73dccdbccaca7e113f7b467982fa
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=8cf1333b189b73dccdbccaca7e113f7b467982fa
Author: Timothy Arceri <t_arceri at yahoo.com.au>
Date: Tue Aug 25 14:15:25 2015 +1000
glsl: link uniform block arrays of arrays
This adds support for setting up the UniformBlock structures for AoA
and also adds support for resizing AoA blocks with a packed layout.
Reviewed-by: Samuel Iglesias Gonsálvez <siglesias at igalia.com>
---
src/glsl/link_uniform_block_active_visitor.cpp | 168 ++++++++++++++++--------
src/glsl/link_uniform_block_active_visitor.h | 13 +-
src/glsl/link_uniform_blocks.cpp | 160 ++++++++++++++--------
3 files changed, 229 insertions(+), 112 deletions(-)
diff --git a/src/glsl/link_uniform_block_active_visitor.cpp b/src/glsl/link_uniform_block_active_visitor.cpp
index bcf17fe..422739a 100644
--- a/src/glsl/link_uniform_block_active_visitor.cpp
+++ b/src/glsl/link_uniform_block_active_visitor.cpp
@@ -71,6 +71,88 @@ process_block(void *mem_ctx, struct hash_table *ht, ir_variable *var)
return NULL;
}
+/* For arrays of arrays this function will give us a middle ground between
+ * detecting inactive uniform blocks and structuring them in a way that makes
+ * it easy to calculate the offset for indirect indexing.
+ *
+ * For example given the shader:
+ *
+ * uniform ArraysOfArraysBlock
+ * {
+ * vec4 a;
+ * } i[3][4][5];
+ *
+ * void main()
+ * {
+ * vec4 b = i[0][1][1].a;
+ * gl_Position = i[2][2][3].a + b;
+ * }
+ *
+ * There are only 2 active blocks above but for the sake of indirect indexing
+ * and not over complicating the code we will end up with a count of 8.
+ * Here each dimension has 2 different indices counted so we end up with 2*2*2
+ */
+struct uniform_block_array_elements **
+process_arrays(void *mem_ctx, ir_dereference_array *ir,
+ struct link_uniform_block_active *block)
+{
+ if (ir) {
+ struct uniform_block_array_elements **ub_array_ptr =
+ process_arrays(mem_ctx, ir->array->as_dereference_array(), block);
+ if (*ub_array_ptr == NULL) {
+ *ub_array_ptr = rzalloc(mem_ctx, struct uniform_block_array_elements);
+ (*ub_array_ptr)->ir = ir;
+ }
+
+ struct uniform_block_array_elements *ub_array = *ub_array_ptr;
+ ir_constant *c = ir->array_index->as_constant();
+ if (c) {
+ /* Index is a constant, so mark just that element used,
+ * if not already.
+ */
+ const unsigned idx = c->get_uint_component(0);
+
+ unsigned i;
+ for (i = 0; i < ub_array->num_array_elements; i++) {
+ if (ub_array->array_elements[i] == idx)
+ break;
+ }
+
+ assert(i <= ub_array->num_array_elements);
+
+ if (i == ub_array->num_array_elements) {
+ ub_array->array_elements = reralloc(mem_ctx,
+ ub_array->array_elements,
+ unsigned,
+ ub_array->num_array_elements + 1);
+
+ ub_array->array_elements[ub_array->num_array_elements] = idx;
+
+ ub_array->num_array_elements++;
+ }
+ } else {
+ /* The array index is not a constant,
+ * so mark the entire array used.
+ */
+ assert(ir->array->type->is_array());
+ if (ub_array->num_array_elements < ir->array->type->length) {
+ ub_array->num_array_elements = ir->array->type->length;
+ ub_array->array_elements = reralloc(mem_ctx,
+ ub_array->array_elements,
+ unsigned,
+ ub_array->num_array_elements);
+
+ for (unsigned i = 0; i < ub_array->num_array_elements; i++) {
+ ub_array->array_elements[i] = i;
+ }
+ }
+ }
+ return &ub_array->array;
+ } else {
+ return &block->array;
+ }
+}
+
ir_visitor_status
link_uniform_block_active_visitor::visit(ir_variable *var)
{
@@ -101,24 +183,30 @@ link_uniform_block_active_visitor::visit(ir_variable *var)
return visit_stop;
}
- assert(b->num_array_elements == 0);
- assert(b->array_elements == NULL);
+ assert(b->array == NULL);
assert(b->type != NULL);
assert(!b->type->is_array() || b->has_instance_name);
/* For uniform block arrays declared with a shared or std140 layout
* qualifier, mark all its instances as used.
*/
- if (b->type->is_array() && b->type->length > 0) {
- b->num_array_elements = b->type->length;
- b->array_elements = reralloc(this->mem_ctx,
- b->array_elements,
- unsigned,
- b->num_array_elements);
-
- for (unsigned i = 0; i < b->num_array_elements; i++) {
- b->array_elements[i] = i;
+ const glsl_type *type = b->type;
+ struct uniform_block_array_elements **ub_array = &b->array;
+ while (type->is_array()) {
+ assert(b->type->length > 0);
+
+ *ub_array = rzalloc(this->mem_ctx, struct uniform_block_array_elements);
+ (*ub_array)->num_array_elements = type->length;
+ (*ub_array)->array_elements = reralloc(this->mem_ctx,
+ (*ub_array)->array_elements,
+ unsigned,
+ (*ub_array)->num_array_elements);
+
+ for (unsigned i = 0; i < (*ub_array)->num_array_elements; i++) {
+ (*ub_array)->array_elements[i] = i;
}
+ ub_array = &(*ub_array)->array;
+ type = type->fields.array;
}
return visit_continue;
@@ -127,7 +215,13 @@ link_uniform_block_active_visitor::visit(ir_variable *var)
ir_visitor_status
link_uniform_block_active_visitor::visit_enter(ir_dereference_array *ir)
{
- ir_dereference_variable *const d = ir->array->as_dereference_variable();
+ /* cycle through arrays of arrays */
+ ir_dereference_array *base_ir = ir;
+ while (base_ir->array->ir_type == ir_type_dereference_array)
+ base_ir = base_ir->array->as_dereference_array();
+
+ ir_dereference_variable *const d =
+ base_ir->array->as_dereference_variable();
ir_variable *const var = (d == NULL) ? NULL : d->var;
/* If the r-value being dereferenced is not a variable (e.g., a field of a
@@ -158,55 +252,16 @@ link_uniform_block_active_visitor::visit_enter(ir_dereference_array *ir)
/* Block arrays must be declared with an instance name.
*/
assert(b->has_instance_name);
- assert((b->num_array_elements == 0) == (b->array_elements == NULL));
assert(b->type != NULL);
/* If the block array was declared with a shared or
* std140 layout qualifier, all its instances have been already marked
* as used in link_uniform_block_active_visitor::visit(ir_variable *).
*/
- if (var->get_interface_type()->interface_packing !=
- GLSL_INTERFACE_PACKING_PACKED)
- return visit_continue_with_parent;
-
- ir_constant *c = ir->array_index->as_constant();
-
- if (c) {
- /* Index is a constant, so mark just that element used, if not already */
- const unsigned idx = c->get_uint_component(0);
-
- unsigned i;
- for (i = 0; i < b->num_array_elements; i++) {
- if (b->array_elements[i] == idx)
- break;
- }
-
- assert(i <= b->num_array_elements);
-
- if (i == b->num_array_elements) {
- b->array_elements = reralloc(this->mem_ctx,
- b->array_elements,
- unsigned,
- b->num_array_elements + 1);
-
- b->array_elements[b->num_array_elements] = idx;
-
- b->num_array_elements++;
- }
- } else {
- /* The array index is not a constant, so mark the entire array used. */
- assert(b->type->is_array());
- if (b->num_array_elements < b->type->length) {
- b->num_array_elements = b->type->length;
- b->array_elements = reralloc(this->mem_ctx,
- b->array_elements,
- unsigned,
- b->num_array_elements);
-
- for (unsigned i = 0; i < b->num_array_elements; i++) {
- b->array_elements[i] = i;
- }
- }
+ if (var->get_interface_type()->interface_packing ==
+ GLSL_INTERFACE_PACKING_PACKED) {
+ b->var = var;
+ process_arrays(this->mem_ctx, ir, b);
}
return visit_continue_with_parent;
@@ -234,8 +289,7 @@ link_uniform_block_active_visitor::visit(ir_dereference_variable *ir)
return visit_stop;
}
- assert(b->num_array_elements == 0);
- assert(b->array_elements == NULL);
+ assert(b->array == NULL);
assert(b->type != NULL);
return visit_continue;
diff --git a/src/glsl/link_uniform_block_active_visitor.h b/src/glsl/link_uniform_block_active_visitor.h
index b663a88..afb52c1 100644
--- a/src/glsl/link_uniform_block_active_visitor.h
+++ b/src/glsl/link_uniform_block_active_visitor.h
@@ -28,11 +28,20 @@
#include "ir.h"
#include "util/hash_table.h"
+struct uniform_block_array_elements {
+ unsigned *array_elements;
+ unsigned num_array_elements;
+
+ ir_dereference_array *ir;
+
+ struct uniform_block_array_elements *array;
+};
+
struct link_uniform_block_active {
const glsl_type *type;
+ ir_variable *var;
- unsigned *array_elements;
- unsigned num_array_elements;
+ struct uniform_block_array_elements *array;
unsigned binding;
diff --git a/src/glsl/link_uniform_blocks.cpp b/src/glsl/link_uniform_blocks.cpp
index 7ceffee..5285d8d 100644
--- a/src/glsl/link_uniform_blocks.cpp
+++ b/src/glsl/link_uniform_blocks.cpp
@@ -116,7 +116,7 @@ private:
char *open_bracket = strchr(v->IndexName, '[');
assert(open_bracket != NULL);
- char *close_bracket = strchr(open_bracket, ']');
+ char *close_bracket = strchr(open_bracket, '.') - 1;
assert(close_bracket != NULL);
/* Length of the tail without the ']' but with the NUL.
@@ -185,6 +185,91 @@ struct block {
bool has_instance_name;
};
+static void
+process_block_array(struct uniform_block_array_elements *ub_array, char **name,
+ size_t name_length, gl_uniform_block *blocks,
+ ubo_visitor *parcel, gl_uniform_buffer_variable *variables,
+ const struct link_uniform_block_active *const b,
+ unsigned *block_index, unsigned *binding_offset,
+ struct gl_context *ctx, struct gl_shader_program *prog)
+{
+ if (ub_array) {
+ for (unsigned j = 0; j < ub_array->num_array_elements; j++) {
+ size_t new_length = name_length;
+
+ /* Append the subscript to the current variable name */
+ ralloc_asprintf_rewrite_tail(name, &new_length, "[%u]",
+ ub_array->array_elements[j]);
+
+ process_block_array(ub_array->array, name, new_length, blocks,
+ parcel, variables, b, block_index,
+ binding_offset, ctx, prog);
+ }
+ } else {
+ unsigned i = *block_index;
+ const glsl_type *type = b->type->without_array();
+
+ blocks[i].Name = ralloc_strdup(blocks, *name);
+ blocks[i].Uniforms = &variables[(*parcel).index];
+
+ /* The GL_ARB_shading_language_420pack spec says:
+ *
+ * "If the binding identifier is used with a uniform block
+ * instanced as an array then the first element of the array
+ * takes the specified block binding and each subsequent
+ * element takes the next consecutive uniform block binding
+ * point."
+ */
+ blocks[i].Binding = (b->has_binding) ? b->binding + *binding_offset : 0;
+
+ blocks[i].UniformBufferSize = 0;
+ blocks[i]._Packing = gl_uniform_block_packing(type->interface_packing);
+
+ parcel->process(type, blocks[i].Name);
+
+ blocks[i].UniformBufferSize = parcel->buffer_size;
+
+ /* Check SSBO size is lower than maximum supported size for SSBO */
+ if (b->is_shader_storage &&
+ parcel->buffer_size > ctx->Const.MaxShaderStorageBlockSize) {
+ linker_error(prog, "shader storage block `%s' has size %d, "
+ "which is larger than than the maximum allowed (%d)",
+ b->type->name,
+ parcel->buffer_size,
+ ctx->Const.MaxShaderStorageBlockSize);
+ }
+ blocks[i].NumUniforms =
+ (unsigned)(ptrdiff_t)(&variables[parcel->index] - blocks[i].Uniforms);
+ blocks[i].IsShaderStorage = b->is_shader_storage;
+
+ *block_index = *block_index + 1;
+ *binding_offset = *binding_offset + 1;
+ }
+}
+
+/* This function resizes the array types of the block so that later we can use
+ * this new size to correctly calculate the offest for indirect indexing.
+ */
+const glsl_type *
+resize_block_array(const glsl_type *type,
+ struct uniform_block_array_elements *ub_array)
+{
+ if (type->is_array()) {
+ struct uniform_block_array_elements *child_array =
+ type->fields.array->is_array() ? ub_array->array : NULL;
+ const glsl_type *new_child_type =
+ resize_block_array(type->fields.array, child_array);
+
+ const glsl_type *new_type =
+ glsl_type::get_array_instance(new_child_type,
+ ub_array->num_array_elements);
+ ub_array->ir->array->type = new_type;
+ return new_type;
+ } else {
+ return type;
+ }
+}
+
unsigned
link_uniform_blocks(void *mem_ctx,
struct gl_context *ctx,
@@ -223,21 +308,25 @@ link_uniform_blocks(void *mem_ctx,
struct hash_entry *entry;
hash_table_foreach (block_hash, entry) {
- const struct link_uniform_block_active *const b =
- (const struct link_uniform_block_active *) entry->data;
+ struct link_uniform_block_active *const b =
+ (struct link_uniform_block_active *) entry->data;
- const glsl_type *const block_type =
- b->type->is_array() ? b->type->fields.array : b->type;
+ assert((b->array != NULL) == b->type->is_array());
- assert((b->num_array_elements > 0) == b->type->is_array());
+ if (b->array != NULL &&
+ (b->type->without_array()->interface_packing ==
+ GLSL_INTERFACE_PACKING_PACKED)) {
+ b->type = resize_block_array(b->type, b->array);
+ b->var->type = b->type;
+ }
block_size.num_active_uniforms = 0;
- block_size.process(block_type, "");
+ block_size.process(b->type->without_array(), "");
- if (b->num_array_elements > 0) {
- num_blocks += b->num_array_elements;
- num_variables += b->num_array_elements
- * block_size.num_active_uniforms;
+ if (b->array != NULL) {
+ unsigned aoa_size = b->type->arrays_of_arrays_size();
+ num_blocks += aoa_size;
+ num_variables += aoa_size * block_size.num_active_uniforms;
} else {
num_blocks++;
num_variables += block_size.num_active_uniforms;
@@ -281,50 +370,15 @@ link_uniform_blocks(void *mem_ctx,
(const struct link_uniform_block_active *) entry->data;
const glsl_type *block_type = b->type;
- if (b->num_array_elements > 0) {
- const char *const name = block_type->fields.array->name;
+ if (b->array != NULL) {
+ unsigned binding_offset = 0;
+ char *name = ralloc_strdup(NULL, block_type->without_array()->name);
+ size_t name_length = strlen(name);
assert(b->has_instance_name);
- for (unsigned j = 0; j < b->num_array_elements; j++) {
- blocks[i].Name = ralloc_asprintf(blocks, "%s[%u]", name,
- b->array_elements[j]);
- blocks[i].Uniforms = &variables[parcel.index];
-
- /* The GL_ARB_shading_language_420pack spec says:
- *
- * "If the binding identifier is used with a uniform block
- * instanced as an array then the first element of the array
- * takes the specified block binding and each subsequent
- * element takes the next consecutive uniform block binding
- * point."
- */
- blocks[i].Binding = (b->has_binding) ? b->binding + j : 0;
-
- blocks[i].UniformBufferSize = 0;
- blocks[i]._Packing =
- gl_uniform_block_packing(block_type->interface_packing);
-
- parcel.process(block_type->fields.array,
- blocks[i].Name);
-
- blocks[i].UniformBufferSize = parcel.buffer_size;
-
- /* Check SSBO size is lower than maximum supported size for SSBO */
- if (b->is_shader_storage &&
- parcel.buffer_size > ctx->Const.MaxShaderStorageBlockSize) {
- linker_error(prog, "shader storage block `%s' has size %d, "
- "which is larger than than the maximum allowed (%d)",
- block_type->name,
- parcel.buffer_size,
- ctx->Const.MaxShaderStorageBlockSize);
- }
- blocks[i].NumUniforms =
- (unsigned)(ptrdiff_t)(&variables[parcel.index] - blocks[i].Uniforms);
-
- blocks[i].IsShaderStorage = b->is_shader_storage;
-
- i++;
- }
+ process_block_array(b->array, &name, name_length, blocks, &parcel,
+ variables, b, &i, &binding_offset, ctx, prog);
+ ralloc_free(name);
} else {
blocks[i].Name = ralloc_strdup(blocks, block_type->name);
blocks[i].Uniforms = &variables[parcel.index];
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