#include "ir.h"
#include "linker.h"
#include "ir_uniform.h"
+#include "link_uniform_block_active_visitor.h"
+#include "util/hash_table.h"
#include "program.h"
+namespace {
+
+class ubo_visitor : public program_resource_visitor {
+public:
+ ubo_visitor(void *mem_ctx, gl_uniform_buffer_variable *variables,
+ unsigned num_variables)
+ : index(0), offset(0), buffer_size(0), variables(variables),
+ num_variables(num_variables), mem_ctx(mem_ctx), is_array_instance(false)
+ {
+ /* empty */
+ }
+
+ void process(const glsl_type *type, const char *name)
+ {
+ this->offset = 0;
+ this->buffer_size = 0;
+ this->is_array_instance = strchr(name, ']') != NULL;
+ this->program_resource_visitor::process(type, name);
+ }
+
+ unsigned index;
+ unsigned offset;
+ unsigned buffer_size;
+ gl_uniform_buffer_variable *variables;
+ unsigned num_variables;
+ void *mem_ctx;
+ bool is_array_instance;
+
+private:
+ virtual void visit_field(const glsl_type *type, const char *name,
+ bool row_major)
+ {
+ (void) type;
+ (void) name;
+ (void) row_major;
+ assert(!"Should not get here.");
+ }
+
+ virtual void enter_record(const glsl_type *type, const char *,
+ bool row_major, const unsigned packing) {
+ assert(type->is_record());
+ if (packing == GLSL_INTERFACE_PACKING_STD430)
+ this->offset = glsl_align(
+ this->offset, type->std430_base_alignment(row_major));
+ else
+ this->offset = glsl_align(
+ this->offset, type->std140_base_alignment(row_major));
+ }
+
+ virtual void leave_record(const glsl_type *type, const char *,
+ bool row_major, const unsigned packing) {
+ assert(type->is_record());
+
+ /* If this is the last field of a structure, apply rule #9. The
+ * GL_ARB_uniform_buffer_object spec says:
+ *
+ * "The structure may have padding at the end; the base offset of
+ * the member following the sub-structure is rounded up to the next
+ * multiple of the base alignment of the structure."
+ */
+ if (packing == GLSL_INTERFACE_PACKING_STD430)
+ this->offset = glsl_align(
+ this->offset, type->std430_base_alignment(row_major));
+ else
+ this->offset = glsl_align(
+ this->offset, type->std140_base_alignment(row_major));
+ }
+
+ virtual void visit_field(const glsl_type *type, const char *name,
+ bool row_major, const glsl_type *,
+ const unsigned packing,
+ bool last_field)
+ {
+ assert(this->index < this->num_variables);
+
+ gl_uniform_buffer_variable *v = &this->variables[this->index++];
+
+ v->Name = ralloc_strdup(mem_ctx, name);
+ v->Type = type;
+ v->RowMajor = type->without_array()->is_matrix() && row_major;
+
+ if (this->is_array_instance) {
+ v->IndexName = ralloc_strdup(mem_ctx, name);
+
+ char *open_bracket = strchr(v->IndexName, '[');
+ assert(open_bracket != NULL);
+
+ char *close_bracket = strchr(open_bracket, '.') - 1;
+ assert(close_bracket != NULL);
+
+ /* Length of the tail without the ']' but with the NUL.
+ */
+ unsigned len = strlen(close_bracket + 1) + 1;
+
+ memmove(open_bracket, close_bracket + 1, len);
+ } else {
+ v->IndexName = v->Name;
+ }
+
+ unsigned alignment = 0;
+ unsigned size = 0;
+
+ /* From ARB_program_interface_query:
+ *
+ * "If the final member of an active shader storage block is array
+ * with no declared size, the minimum buffer size is computed
+ * assuming the array was declared as an array with one element."
+ *
+ * For that reason, we use the base type of the unsized array to calculate
+ * its size. We don't need to check if the unsized array is the last member
+ * of a shader storage block (that check was already done by the parser).
+ */
+ const glsl_type *type_for_size = type;
+ if (type->is_unsized_array()) {
+ assert(last_field);
+ type_for_size = type->without_array();
+ }
+
+ if (packing == GLSL_INTERFACE_PACKING_STD430) {
+ alignment = type->std430_base_alignment(v->RowMajor);
+ size = type_for_size->std430_size(v->RowMajor);
+ } else {
+ alignment = type->std140_base_alignment(v->RowMajor);
+ size = type_for_size->std140_size(v->RowMajor);
+ }
+
+ this->offset = glsl_align(this->offset, alignment);
+ v->Offset = this->offset;
+
+ this->offset += size;
+
+ /* From the GL_ARB_uniform_buffer_object spec:
+ *
+ * "For uniform blocks laid out according to [std140] rules, the
+ * minimum buffer object size returned by the
+ * UNIFORM_BLOCK_DATA_SIZE query is derived by taking the offset of
+ * the last basic machine unit consumed by the last uniform of the
+ * uniform block (including any end-of-array or end-of-structure
+ * padding), adding one, and rounding up to the next multiple of
+ * the base alignment required for a vec4."
+ */
+ this->buffer_size = glsl_align(this->offset, 16);
+ }
+};
+
+class count_block_size : public program_resource_visitor {
+public:
+ count_block_size() : num_active_uniforms(0)
+ {
+ /* empty */
+ }
+
+ unsigned num_active_uniforms;
+
+private:
+ virtual void visit_field(const glsl_type *type, const char *name,
+ bool row_major)
+ {
+ (void) type;
+ (void) name;
+ (void) row_major;
+ this->num_active_uniforms++;
+ }
+};
+
+} /* anonymous namespace */
+
+struct block {
+ const glsl_type *type;
+ 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,
+ struct gl_shader_program *prog,
+ struct gl_shader **shader_list,
+ unsigned num_shaders,
+ struct gl_uniform_block **blocks_ret)
+{
+ /* This hash table will track all of the uniform blocks that have been
+ * encountered. Since blocks with the same block-name must be the same,
+ * the hash is organized by block-name.
+ */
+ struct hash_table *block_hash =
+ _mesa_hash_table_create(mem_ctx, _mesa_key_hash_string,
+ _mesa_key_string_equal);
+
+ if (block_hash == NULL) {
+ _mesa_error_no_memory(__func__);
+ linker_error(prog, "out of memory\n");
+ return 0;
+ }
+
+ /* Determine which uniform blocks are active.
+ */
+ link_uniform_block_active_visitor v(mem_ctx, block_hash, prog);
+ for (unsigned i = 0; i < num_shaders; i++) {
+ visit_list_elements(&v, shader_list[i]->ir);
+ }
+
+ /* Count the number of active uniform blocks. Count the total number of
+ * active slots in those uniform blocks.
+ */
+ unsigned num_blocks = 0;
+ unsigned num_variables = 0;
+ count_block_size block_size;
+ struct hash_entry *entry;
+
+ hash_table_foreach (block_hash, entry) {
+ struct link_uniform_block_active *const b =
+ (struct link_uniform_block_active *) entry->data;
+
+ assert((b->array != NULL) == 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(b->type->without_array(), "");
+
+ 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;
+ }
+
+ }
+
+ if (num_blocks == 0) {
+ assert(num_variables == 0);
+ _mesa_hash_table_destroy(block_hash, NULL);
+ return 0;
+ }
+
+ assert(num_variables != 0);
+
+ /* Allocate storage to hold all of the informatation related to uniform
+ * blocks that can be queried through the API.
+ */
+ gl_uniform_block *blocks =
+ ralloc_array(mem_ctx, gl_uniform_block, num_blocks);
+ gl_uniform_buffer_variable *variables =
+ ralloc_array(blocks, gl_uniform_buffer_variable, num_variables);
+
+ /* Add each variable from each uniform block to the API tracking
+ * structures.
+ */
+ unsigned i = 0;
+ ubo_visitor parcel(blocks, variables, num_variables);
+
+ STATIC_ASSERT(unsigned(GLSL_INTERFACE_PACKING_STD140)
+ == unsigned(ubo_packing_std140));
+ STATIC_ASSERT(unsigned(GLSL_INTERFACE_PACKING_SHARED)
+ == unsigned(ubo_packing_shared));
+ STATIC_ASSERT(unsigned(GLSL_INTERFACE_PACKING_PACKED)
+ == unsigned(ubo_packing_packed));
+ STATIC_ASSERT(unsigned(GLSL_INTERFACE_PACKING_STD430)
+ == unsigned(ubo_packing_std430));
+
+ hash_table_foreach (block_hash, entry) {
+ const struct link_uniform_block_active *const b =
+ (const struct link_uniform_block_active *) entry->data;
+ const glsl_type *block_type = b->type;
+
+ 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);
+ 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];
+ blocks[i].Binding = (b->has_binding) ? b->binding : 0;
+ blocks[i].UniformBufferSize = 0;
+ blocks[i]._Packing =
+ gl_uniform_block_packing(block_type->interface_packing);
+
+ parcel.process(block_type,
+ b->has_instance_name ? block_type->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++;
+ }
+ }
+
+ assert(parcel.index == num_variables);
+
+ _mesa_hash_table_destroy(block_hash, NULL);
+
+ *blocks_ret = blocks;
+ return num_blocks;
+}
+
bool
link_uniform_blocks_are_compatible(const gl_uniform_block *a,
const gl_uniform_block *b)
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