> +
> +static bool gpir_lower_viewport_transform(gpir_compiler *comp)
> +{
> + gpir_node *rcpw = NULL;
> +
> + /* rcpw = 1 / w */
> + list_for_each_entry(gpir_block, block, &comp->block_list, list) {
> + list_for_each_entry(gpir_node, node, &block->node_list, list) {
> + if (node->op == gpir_op_store_varying) {
> + gpir_store_node *store = gpir_node_to_store(node);
> + if (store->index == 0 && store->component == 3) {
> + gpir_node *w = store->child;
> +
> + rcpw = gpir_node_create(block, gpir_op_rcp);
> + if (!rcpw)
> + return false;
> + list_addtail(&rcpw->list, &node->list);
> +
> + gpir_alu_node *alu = gpir_node_to_alu(rcpw);
> + alu->children[0] = w;
> + alu->num_child = 1;
> + store->child = rcpw;
> +
> + gpir_node_insert_child(node, w, rcpw);
> + goto found;
> + }
> + }
> + }
> + }
> +
> +found:
> + assert(rcpw);
> +
> + /* xyz = xyz * rcpw * scale + transition */
> + list_for_each_entry(gpir_block, block, &comp->block_list, list) {
> + list_for_each_entry(gpir_node, node, &block->node_list, list) {
> + if (node->op == gpir_op_store_varying) {
> + gpir_store_node *store = gpir_node_to_store(node);
> + if (store->index == 0 && store->component < 3) {
> + gpir_node *xyz = store->child;
> +
> + gpir_node *mul1 =
> + gpir_lower_create_insert_node(node, xyz, rcpw,
> gpir_op_mul);
> + if (!mul1)
> + return false;
> +
> + gpir_load_node *scale = gpir_node_create(block,
> gpir_op_load_uniform);
> + if (!scale)
> + return false;
> + scale->index = comp->constant_base;
> + scale->component = store->component;
> + list_addtail(&scale->node.list, &node->list);
> +
> + gpir_node *mul2 =
> + gpir_lower_create_insert_node(node, mul1, &scale->node,
> gpir_op_mul);
> + if (!mul2)
> + return false;
> +
> + gpir_load_node *translate = gpir_node_create(block,
> gpir_op_load_uniform);
> + if (!translate)
> + return false;
> + translate->index = comp->constant_base + 1;
> + translate->component = store->component;
> + list_addtail(&translate->node.list, &node->list);
> +
> + gpir_node *add =
> + gpir_lower_create_insert_node(node, mul2,
> &translate->node, gpir_op_add);
> + if (!add)
> + return false;
> +
> + store->child = add;
> + }
> + }
> + }
> + }
> +
> + comp->constant_base += 2;
> + return true;
> +}
I have this routine implemented in Panfrost at the NIR level, rather
than the ISA level. Do we want to move this to common NIR code?
> +static int gpir_get_max_start(gpir_node *node)
Read until here (note to self, gotta go, will read more later).
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