/* * Copyright © 2018 Intel Corporation * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. */ #include "nir_xfb_info.h" #include static void add_var_xfb_outputs(nir_xfb_info *xfb, nir_variable *var, unsigned *location, unsigned *offset, const struct glsl_type *type) { if (glsl_type_is_array(type) || glsl_type_is_matrix(type)) { unsigned length = glsl_get_length(type); const struct glsl_type *child_type = glsl_get_array_element(type); for (unsigned i = 0; i < length; i++) add_var_xfb_outputs(xfb, var, location, offset, child_type); } else if (glsl_type_is_struct(type)) { unsigned length = glsl_get_length(type); for (unsigned i = 0; i < length; i++) { const struct glsl_type *child_type = glsl_get_struct_field(type, i); add_var_xfb_outputs(xfb, var, location, offset, child_type); } } else { assert(var->data.xfb_buffer < NIR_MAX_XFB_BUFFERS); if (xfb->buffers_written & (1 << var->data.xfb_buffer)) { assert(xfb->strides[var->data.xfb_buffer] == var->data.xfb_stride); assert(xfb->buffer_to_stream[var->data.xfb_buffer] == var->data.stream); } else { xfb->buffers_written |= (1 << var->data.xfb_buffer); xfb->strides[var->data.xfb_buffer] = var->data.xfb_stride; xfb->buffer_to_stream[var->data.xfb_buffer] = var->data.stream; } assert(var->data.stream < NIR_MAX_XFB_STREAMS); xfb->streams_written |= (1 << var->data.stream); unsigned comp_slots = glsl_get_component_slots(type); unsigned attrib_slots = DIV_ROUND_UP(comp_slots, 4); assert(attrib_slots == glsl_count_attribute_slots(type, false)); /* Ensure that we don't have, for instance, a dvec2 with a location_frac * of 2 which would make it crass a location boundary even though it * fits in a single slot. However, you can have a dvec3 which crosses * the slot boundary with a location_frac of 2. */ assert(DIV_ROUND_UP(var->data.location_frac + comp_slots, 4) == attrib_slots); assert(var->data.location_frac + comp_slots <= 8); uint8_t comp_mask = ((1 << comp_slots) - 1) << var->data.location_frac; assert(attrib_slots <= 2); for (unsigned s = 0; s < attrib_slots; s++) { nir_xfb_output_info *output = &xfb->outputs[xfb->output_count++]; output->buffer = var->data.xfb_buffer; output->offset = *offset; output->location = *location; output->component_mask = (comp_mask >> (s * 4)) & 0xf; (*location)++; *offset += comp_slots * 4; } } } static int compare_xfb_output_offsets(const void *_a, const void *_b) { const nir_xfb_output_info *a = _a, *b = _b; return a->offset - b->offset; } nir_xfb_info * nir_gather_xfb_info(const nir_shader *shader, void *mem_ctx) { assert(shader->info.stage == MESA_SHADER_VERTEX || shader->info.stage == MESA_SHADER_TESS_EVAL || shader->info.stage == MESA_SHADER_GEOMETRY); /* Compute the number of outputs we have. This is simply the number of * cumulative locations consumed by all the variables. If a location is * represented by multiple variables, then they each count separately in * number of outputs. */ unsigned num_outputs = 0; nir_foreach_variable(var, &shader->outputs) { if (var->data.explicit_xfb_buffer || var->data.explicit_xfb_stride) { assert(var->data.explicit_xfb_buffer && var->data.explicit_xfb_stride && var->data.explicit_offset); num_outputs += glsl_count_attribute_slots(var->type, false); } } if (num_outputs == 0) return NULL; nir_xfb_info *xfb = rzalloc_size(mem_ctx, nir_xfb_info_size(num_outputs)); /* Walk the list of outputs and add them to the array */ nir_foreach_variable(var, &shader->outputs) { if (var->data.explicit_xfb_buffer || var->data.explicit_xfb_stride) { unsigned location = var->data.location; unsigned offset = var->data.offset; add_var_xfb_outputs(xfb, var, &location, &offset, var->type); } } assert(xfb->output_count == num_outputs); /* Everything is easier in the state setup code if the list is sorted in * order of output offset. */ qsort(xfb->outputs, xfb->output_count, sizeof(xfb->outputs[0]), compare_xfb_output_offsets); /* Finally, do a sanity check */ unsigned max_offset[NIR_MAX_XFB_BUFFERS] = {0}; for (unsigned i = 0; i < xfb->output_count; i++) { assert(xfb->outputs[i].offset >= max_offset[xfb->outputs[i].buffer]); assert(xfb->outputs[i].component_mask != 0); unsigned slots = util_bitcount(xfb->outputs[i].component_mask); max_offset[xfb->outputs[i].buffer] = xfb->outputs[i].offset + slots * 4; } return xfb; }