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1 /*
2  * Copyright © 2014 Intel Corporation
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice (including the next
12  * paragraph) shall be included in all copies or substantial portions of the
13  * Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21  * IN THE SOFTWARE.
22  *
23  * Authors:
24  *    Connor Abbott (cwabbott0@gmail.com)
25  *
26  */
27 
28 /**
29  * This header file defines all the available intrinsics in one place. It
30  * expands to a list of macros of the form:
31  *
32  * INTRINSIC(name, num_srcs, src_components, has_dest, dest_components,
33  *              num_variables, num_indices, idx0, idx1, idx2, flags)
34  *
35  * Which should correspond one-to-one with the nir_intrinsic_info structure. It
36  * is included in both ir.h to create the nir_intrinsic enum (with members of
37  * the form nir_intrinsic_(name)) and and in opcodes.c to create
38  * nir_intrinsic_infos, which is a const array of nir_intrinsic_info structures
39  * for each intrinsic.
40  */
41 
42 #define ARR(...) { __VA_ARGS__ }
43 
44 INTRINSIC(nop, 0, ARR(0), false, 0, 0, 0, xx, xx, xx,
45           NIR_INTRINSIC_CAN_ELIMINATE)
46 
47 INTRINSIC(load_var, 0, ARR(0), true, 0, 1, 0, xx, xx, xx, NIR_INTRINSIC_CAN_ELIMINATE)
48 INTRINSIC(store_var, 1, ARR(0), false, 0, 1, 1, WRMASK, xx, xx, 0)
49 INTRINSIC(copy_var, 0, ARR(0), false, 0, 2, 0, xx, xx, xx, 0)
50 
51 /*
52  * Interpolation of input.  The interp_var_at* intrinsics are similar to the
53  * load_var intrinsic acting on a shader input except that they interpolate
54  * the input differently.  The at_sample and at_offset intrinsics take an
55  * additional source that is an integer sample id or a vec2 position offset
56  * respectively.
57  */
58 
59 INTRINSIC(interp_var_at_centroid, 0, ARR(0), true, 0, 1, 0, xx, xx, xx,
60           NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER)
61 INTRINSIC(interp_var_at_sample, 1, ARR(1), true, 0, 1, 0, xx, xx, xx,
62           NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER)
63 INTRINSIC(interp_var_at_offset, 1, ARR(2), true, 0, 1, 0, xx, xx, xx,
64           NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER)
65 
66 /*
67  * Ask the driver for the size of a given buffer. It takes the buffer index
68  * as source.
69  */
70 INTRINSIC(get_buffer_size, 1, ARR(1), true, 1, 0, 0, xx, xx, xx,
71           NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER)
72 
73 /*
74  * a barrier is an intrinsic with no inputs/outputs but which can't be moved
75  * around/optimized in general
76  */
77 #define BARRIER(name) INTRINSIC(name, 0, ARR(0), false, 0, 0, 0, xx, xx, xx, 0)
78 
79 BARRIER(barrier)
80 BARRIER(discard)
81 
82 /*
83  * Memory barrier with semantics analogous to the memoryBarrier() GLSL
84  * intrinsic.
85  */
86 BARRIER(memory_barrier)
87 
88 /*
89  * Shader clock intrinsic with semantics analogous to the clock2x32ARB()
90  * GLSL intrinsic.
91  * The latter can be used as code motion barrier, which is currently not
92  * feasible with NIR.
93  */
94 INTRINSIC(shader_clock, 0, ARR(0), true, 2, 0, 0, xx, xx, xx, NIR_INTRINSIC_CAN_ELIMINATE)
95 
96 /*
97  * Shader ballot intrinsics with semantics analogous to the
98  *
99  *    ballotARB()
100  *    readInvocationARB()
101  *    readFirstInvocationARB()
102  *
103  * GLSL functions from ARB_shader_ballot.
104  */
105 INTRINSIC(ballot, 1, ARR(1), true, 0, 0, 0, xx, xx, xx, NIR_INTRINSIC_CAN_ELIMINATE)
106 INTRINSIC(read_invocation, 2, ARR(0, 1), true, 0, 0, 0, xx, xx, xx, NIR_INTRINSIC_CAN_ELIMINATE)
107 INTRINSIC(read_first_invocation, 1, ARR(0), true, 0, 0, 0, xx, xx, xx, NIR_INTRINSIC_CAN_ELIMINATE)
108 
109 /*
110  * Memory barrier with semantics analogous to the compute shader
111  * groupMemoryBarrier(), memoryBarrierAtomicCounter(), memoryBarrierBuffer(),
112  * memoryBarrierImage() and memoryBarrierShared() GLSL intrinsics.
113  */
114 BARRIER(group_memory_barrier)
115 BARRIER(memory_barrier_atomic_counter)
116 BARRIER(memory_barrier_buffer)
117 BARRIER(memory_barrier_image)
118 BARRIER(memory_barrier_shared)
119 
120 /** A conditional discard, with a single boolean source. */
121 INTRINSIC(discard_if, 1, ARR(1), false, 0, 0, 0, xx, xx, xx, 0)
122 
123 /** ARB_shader_group_vote intrinsics */
124 INTRINSIC(vote_any, 1, ARR(1), true, 1, 0, 0, xx, xx, xx, NIR_INTRINSIC_CAN_ELIMINATE)
125 INTRINSIC(vote_all, 1, ARR(1), true, 1, 0, 0, xx, xx, xx, NIR_INTRINSIC_CAN_ELIMINATE)
126 INTRINSIC(vote_eq,  1, ARR(1), true, 1, 0, 0, xx, xx, xx, NIR_INTRINSIC_CAN_ELIMINATE)
127 
128 /**
129  * Basic Geometry Shader intrinsics.
130  *
131  * emit_vertex implements GLSL's EmitStreamVertex() built-in.  It takes a single
132  * index, which is the stream ID to write to.
133  *
134  * end_primitive implements GLSL's EndPrimitive() built-in.
135  */
136 INTRINSIC(emit_vertex,   0, ARR(0), false, 0, 0, 1, STREAM_ID, xx, xx, 0)
137 INTRINSIC(end_primitive, 0, ARR(0), false, 0, 0, 1, STREAM_ID, xx, xx, 0)
138 
139 /**
140  * Geometry Shader intrinsics with a vertex count.
141  *
142  * Alternatively, drivers may implement these intrinsics, and use
143  * nir_lower_gs_intrinsics() to convert from the basic intrinsics.
144  *
145  * These maintain a count of the number of vertices emitted, as an additional
146  * unsigned integer source.
147  */
148 INTRINSIC(emit_vertex_with_counter, 1, ARR(1), false, 0, 0, 1, STREAM_ID, xx, xx, 0)
149 INTRINSIC(end_primitive_with_counter, 1, ARR(1), false, 0, 0, 1, STREAM_ID, xx, xx, 0)
150 INTRINSIC(set_vertex_count, 1, ARR(1), false, 0, 0, 0, xx, xx, xx, 0)
151 
152 /*
153  * Atomic counters
154  *
155  * The *_var variants take an atomic_uint nir_variable, while the other,
156  * lowered, variants take a constant buffer index and register offset.
157  */
158 
159 #define ATOMIC(name, flags) \
160    INTRINSIC(name##_var, 0, ARR(0), true, 1, 1, 0, xx, xx, xx, flags) \
161    INTRINSIC(name, 1, ARR(1), true, 1, 0, 1, BASE, xx, xx, flags)
162 #define ATOMIC2(name) \
163    INTRINSIC(name##_var, 1, ARR(1), true, 1, 1, 0, xx, xx, xx, 0) \
164    INTRINSIC(name, 2, ARR(1, 1), true, 1, 0, 1, BASE, xx, xx, 0)
165 #define ATOMIC3(name) \
166    INTRINSIC(name##_var, 2, ARR(1, 1), true, 1, 1, 0, xx, xx, xx, 0) \
167    INTRINSIC(name, 3, ARR(1, 1, 1), true, 1, 0, 1, BASE, xx, xx, 0)
168 
169 ATOMIC(atomic_counter_inc, 0)
170 ATOMIC(atomic_counter_dec, 0)
171 ATOMIC(atomic_counter_read, NIR_INTRINSIC_CAN_ELIMINATE)
172 ATOMIC2(atomic_counter_add)
173 ATOMIC2(atomic_counter_min)
174 ATOMIC2(atomic_counter_max)
175 ATOMIC2(atomic_counter_and)
176 ATOMIC2(atomic_counter_or)
177 ATOMIC2(atomic_counter_xor)
178 ATOMIC2(atomic_counter_exchange)
179 ATOMIC3(atomic_counter_comp_swap)
180 
181 /*
182  * Image load, store and atomic intrinsics.
183  *
184  * All image intrinsics take an image target passed as a nir_variable.  Image
185  * variables contain a number of memory and layout qualifiers that influence
186  * the semantics of the intrinsic.
187  *
188  * All image intrinsics take a four-coordinate vector and a sample index as
189  * first two sources, determining the location within the image that will be
190  * accessed by the intrinsic.  Components not applicable to the image target
191  * in use are undefined.  Image store takes an additional four-component
192  * argument with the value to be written, and image atomic operations take
193  * either one or two additional scalar arguments with the same meaning as in
194  * the ARB_shader_image_load_store specification.
195  */
196 INTRINSIC(image_load, 2, ARR(4, 1), true, 4, 1, 0, xx, xx, xx,
197           NIR_INTRINSIC_CAN_ELIMINATE)
198 INTRINSIC(image_store, 3, ARR(4, 1, 4), false, 0, 1, 0, xx, xx, xx, 0)
199 INTRINSIC(image_atomic_add, 3, ARR(4, 1, 1), true, 1, 1, 0, xx, xx, xx, 0)
200 INTRINSIC(image_atomic_min, 3, ARR(4, 1, 1), true, 1, 1, 0, xx, xx, xx, 0)
201 INTRINSIC(image_atomic_max, 3, ARR(4, 1, 1), true, 1, 1, 0, xx, xx, xx, 0)
202 INTRINSIC(image_atomic_and, 3, ARR(4, 1, 1), true, 1, 1, 0, xx, xx, xx, 0)
203 INTRINSIC(image_atomic_or, 3, ARR(4, 1, 1), true, 1, 1, 0, xx, xx, xx, 0)
204 INTRINSIC(image_atomic_xor, 3, ARR(4, 1, 1), true, 1, 1, 0, xx, xx, xx, 0)
205 INTRINSIC(image_atomic_exchange, 3, ARR(4, 1, 1), true, 1, 1, 0, xx, xx, xx, 0)
206 INTRINSIC(image_atomic_comp_swap, 4, ARR(4, 1, 1, 1), true, 1, 1, 0, xx, xx, xx, 0)
207 INTRINSIC(image_size, 0, ARR(0), true, 0, 1, 0, xx, xx, xx,
208           NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER)
209 INTRINSIC(image_samples, 0, ARR(0), true, 1, 1, 0, xx, xx, xx,
210           NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER)
211 
212 /*
213  * Vulkan descriptor set intrinsics
214  *
215  * The Vulkan API uses a different binding model from GL.  In the Vulkan
216  * API, all external resources are represented by a tuple:
217  *
218  * (descriptor set, binding, array index)
219  *
220  * where the array index is the only thing allowed to be indirect.  The
221  * vulkan_surface_index intrinsic takes the descriptor set and binding as
222  * its first two indices and the array index as its source.  The third
223  * index is a nir_variable_mode in case that's useful to the backend.
224  *
225  * The intended usage is that the shader will call vulkan_surface_index to
226  * get an index and then pass that as the buffer index ubo/ssbo calls.
227  *
228  * The vulkan_resource_reindex intrinsic takes a resource index in src0
229  * (the result of a vulkan_resource_index or vulkan_resource_reindex) which
230  * corresponds to the tuple (set, binding, index) and computes an index
231  * corresponding to tuple (set, binding, idx + src1).
232  */
233 INTRINSIC(vulkan_resource_index, 1, ARR(1), true, 1, 0, 2,
234           DESC_SET, BINDING, xx,
235           NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER)
236 INTRINSIC(vulkan_resource_reindex, 2, ARR(1, 1), true, 1, 0, 0, xx, xx, xx,
237           NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER)
238 
239 /*
240  * variable atomic intrinsics
241  *
242  * All of these variable atomic memory operations read a value from memory,
243  * compute a new value using one of the operations below, write the new value
244  * to memory, and return the original value read.
245  *
246  * All operations take 1 source except CompSwap that takes 2. These sources
247  * represent:
248  *
249  * 0: The data parameter to the atomic function (i.e. the value to add
250  *    in shared_atomic_add, etc).
251  * 1: For CompSwap only: the second data parameter.
252  *
253  * All operations take 1 variable deref.
254  */
255 INTRINSIC(var_atomic_add, 1, ARR(1), true, 1, 1, 0, xx, xx, xx, 0)
256 INTRINSIC(var_atomic_imin, 1, ARR(1), true, 1, 1, 0, xx, xx, xx, 0)
257 INTRINSIC(var_atomic_umin, 1, ARR(1), true, 1, 1, 0, xx, xx, xx, 0)
258 INTRINSIC(var_atomic_imax, 1, ARR(1), true, 1, 1, 0, xx, xx, xx, 0)
259 INTRINSIC(var_atomic_umax, 1, ARR(1), true, 1, 1, 0, xx, xx, xx, 0)
260 INTRINSIC(var_atomic_and, 1, ARR(1), true, 1, 1, 0, xx, xx, xx, 0)
261 INTRINSIC(var_atomic_or, 1, ARR(1), true, 1, 1, 0, xx, xx, xx, 0)
262 INTRINSIC(var_atomic_xor, 1, ARR(1), true, 1, 1, 0, xx, xx, xx, 0)
263 INTRINSIC(var_atomic_exchange, 1, ARR(1), true, 1, 1, 0, xx, xx, xx, 0)
264 INTRINSIC(var_atomic_comp_swap, 2, ARR(1, 1), true, 1, 1, 0, xx, xx, xx, 0)
265 
266 /*
267  * SSBO atomic intrinsics
268  *
269  * All of the SSBO atomic memory operations read a value from memory,
270  * compute a new value using one of the operations below, write the new
271  * value to memory, and return the original value read.
272  *
273  * All operations take 3 sources except CompSwap that takes 4. These
274  * sources represent:
275  *
276  * 0: The SSBO buffer index.
277  * 1: The offset into the SSBO buffer of the variable that the atomic
278  *    operation will operate on.
279  * 2: The data parameter to the atomic function (i.e. the value to add
280  *    in ssbo_atomic_add, etc).
281  * 3: For CompSwap only: the second data parameter.
282  */
283 INTRINSIC(ssbo_atomic_add, 3, ARR(1, 1, 1), true, 1, 0, 0, xx, xx, xx, 0)
284 INTRINSIC(ssbo_atomic_imin, 3, ARR(1, 1, 1), true, 1, 0, 0, xx, xx, xx, 0)
285 INTRINSIC(ssbo_atomic_umin, 3, ARR(1, 1, 1), true, 1, 0, 0, xx, xx, xx, 0)
286 INTRINSIC(ssbo_atomic_imax, 3, ARR(1, 1, 1), true, 1, 0, 0, xx, xx, xx, 0)
287 INTRINSIC(ssbo_atomic_umax, 3, ARR(1, 1, 1), true, 1, 0, 0, xx, xx, xx, 0)
288 INTRINSIC(ssbo_atomic_and, 3, ARR(1, 1, 1), true, 1, 0, 0, xx, xx, xx, 0)
289 INTRINSIC(ssbo_atomic_or, 3, ARR(1, 1, 1), true, 1, 0, 0, xx, xx, xx, 0)
290 INTRINSIC(ssbo_atomic_xor, 3, ARR(1, 1, 1), true, 1, 0, 0, xx, xx, xx, 0)
291 INTRINSIC(ssbo_atomic_exchange, 3, ARR(1, 1, 1), true, 1, 0, 0, xx, xx, xx, 0)
292 INTRINSIC(ssbo_atomic_comp_swap, 4, ARR(1, 1, 1, 1), true, 1, 0, 0, xx, xx, xx, 0)
293 
294 /*
295  * CS shared variable atomic intrinsics
296  *
297  * All of the shared variable atomic memory operations read a value from
298  * memory, compute a new value using one of the operations below, write the
299  * new value to memory, and return the original value read.
300  *
301  * All operations take 2 sources except CompSwap that takes 3. These
302  * sources represent:
303  *
304  * 0: The offset into the shared variable storage region that the atomic
305  *    operation will operate on.
306  * 1: The data parameter to the atomic function (i.e. the value to add
307  *    in shared_atomic_add, etc).
308  * 2: For CompSwap only: the second data parameter.
309  */
310 INTRINSIC(shared_atomic_add, 2, ARR(1, 1), true, 1, 0, 1, BASE, xx, xx, 0)
311 INTRINSIC(shared_atomic_imin, 2, ARR(1, 1), true, 1, 0, 1, BASE, xx, xx, 0)
312 INTRINSIC(shared_atomic_umin, 2, ARR(1, 1), true, 1, 0, 1, BASE, xx, xx, 0)
313 INTRINSIC(shared_atomic_imax, 2, ARR(1, 1), true, 1, 0, 1, BASE, xx, xx, 0)
314 INTRINSIC(shared_atomic_umax, 2, ARR(1, 1), true, 1, 0, 1, BASE, xx, xx, 0)
315 INTRINSIC(shared_atomic_and, 2, ARR(1, 1), true, 1, 0, 1, BASE, xx, xx, 0)
316 INTRINSIC(shared_atomic_or, 2, ARR(1, 1), true, 1, 0, 1, BASE, xx, xx, 0)
317 INTRINSIC(shared_atomic_xor, 2, ARR(1, 1), true, 1, 0, 1, BASE, xx, xx, 0)
318 INTRINSIC(shared_atomic_exchange, 2, ARR(1, 1), true, 1, 0, 1, BASE, xx, xx, 0)
319 INTRINSIC(shared_atomic_comp_swap, 3, ARR(1, 1, 1), true, 1, 0, 1, BASE, xx, xx, 0)
320 
321 /* Used by nir_builder.h to generate loader helpers for the system values. */
322 #ifndef DEFINE_SYSTEM_VALUE
323 #define DEFINE_SYSTEM_VALUE(name)
324 #endif
325 
326 #define SYSTEM_VALUE(name, components, num_indices, idx0, idx1, idx2) \
327    DEFINE_SYSTEM_VALUE(name) \
328    INTRINSIC(load_##name, 0, ARR(0), true, components, 0, num_indices, \
329    idx0, idx1, idx2, \
330    NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER)
331 
332 SYSTEM_VALUE(frag_coord, 4, 0, xx, xx, xx)
333 SYSTEM_VALUE(front_face, 1, 0, xx, xx, xx)
334 SYSTEM_VALUE(vertex_id, 1, 0, xx, xx, xx)
335 SYSTEM_VALUE(vertex_id_zero_base, 1, 0, xx, xx, xx)
336 SYSTEM_VALUE(base_vertex, 1, 0, xx, xx, xx)
337 SYSTEM_VALUE(instance_id, 1, 0, xx, xx, xx)
338 SYSTEM_VALUE(base_instance, 1, 0, xx, xx, xx)
339 SYSTEM_VALUE(draw_id, 1, 0, xx, xx, xx)
340 SYSTEM_VALUE(sample_id, 1, 0, xx, xx, xx)
341 SYSTEM_VALUE(sample_pos, 2, 0, xx, xx, xx)
342 SYSTEM_VALUE(sample_mask_in, 1, 0, xx, xx, xx)
343 SYSTEM_VALUE(primitive_id, 1, 0, xx, xx, xx)
344 SYSTEM_VALUE(invocation_id, 1, 0, xx, xx, xx)
345 SYSTEM_VALUE(tess_coord, 3, 0, xx, xx, xx)
346 SYSTEM_VALUE(tess_level_outer, 4, 0, xx, xx, xx)
347 SYSTEM_VALUE(tess_level_inner, 2, 0, xx, xx, xx)
348 SYSTEM_VALUE(patch_vertices_in, 1, 0, xx, xx, xx)
349 SYSTEM_VALUE(local_invocation_id, 3, 0, xx, xx, xx)
350 SYSTEM_VALUE(local_invocation_index, 1, 0, xx, xx, xx)
351 SYSTEM_VALUE(work_group_id, 3, 0, xx, xx, xx)
352 SYSTEM_VALUE(user_clip_plane, 4, 1, UCP_ID, xx, xx)
353 SYSTEM_VALUE(num_work_groups, 3, 0, xx, xx, xx)
354 SYSTEM_VALUE(helper_invocation, 1, 0, xx, xx, xx)
355 SYSTEM_VALUE(alpha_ref_float, 1, 0, xx, xx, xx)
356 SYSTEM_VALUE(layer_id, 1, 0, xx, xx, xx)
357 SYSTEM_VALUE(view_index, 1, 0, xx, xx, xx)
358 SYSTEM_VALUE(subgroup_size, 1, 0, xx, xx, xx)
359 SYSTEM_VALUE(subgroup_invocation, 1, 0, xx, xx, xx)
360 SYSTEM_VALUE(subgroup_eq_mask, 0, 0, xx, xx, xx)
361 SYSTEM_VALUE(subgroup_ge_mask, 0, 0, xx, xx, xx)
362 SYSTEM_VALUE(subgroup_gt_mask, 0, 0, xx, xx, xx)
363 SYSTEM_VALUE(subgroup_le_mask, 0, 0, xx, xx, xx)
364 SYSTEM_VALUE(subgroup_lt_mask, 0, 0, xx, xx, xx)
365 SYSTEM_VALUE(subgroup_id, 1, 0, xx, xx, xx)
366 SYSTEM_VALUE(local_group_size, 3, 0, xx, xx, xx)
367 
368 /* Blend constant color values.  Float values are clamped. */
369 SYSTEM_VALUE(blend_const_color_r_float, 1, 0, xx, xx, xx)
370 SYSTEM_VALUE(blend_const_color_g_float, 1, 0, xx, xx, xx)
371 SYSTEM_VALUE(blend_const_color_b_float, 1, 0, xx, xx, xx)
372 SYSTEM_VALUE(blend_const_color_a_float, 1, 0, xx, xx, xx)
373 SYSTEM_VALUE(blend_const_color_rgba8888_unorm, 1, 0, xx, xx, xx)
374 SYSTEM_VALUE(blend_const_color_aaaa8888_unorm, 1, 0, xx, xx, xx)
375 
376 /**
377  * Barycentric coordinate intrinsics.
378  *
379  * These set up the barycentric coordinates for a particular interpolation.
380  * The first three are for the simple cases: pixel, centroid, or per-sample
381  * (at gl_SampleID).  The next two handle interpolating at a specified
382  * sample location, or interpolating with a vec2 offset,
383  *
384  * The interp_mode index should be either the INTERP_MODE_SMOOTH or
385  * INTERP_MODE_NOPERSPECTIVE enum values.
386  *
387  * The vec2 value produced by these intrinsics is intended for use as the
388  * barycoord source of a load_interpolated_input intrinsic.
389  */
390 
391 #define BARYCENTRIC(name, sources, source_components) \
392    INTRINSIC(load_barycentric_##name, sources, ARR(source_components), \
393              true, 2, 0, 1, INTERP_MODE, xx, xx, \
394              NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER)
395 
396 /* no sources.  const_index[] = { interp_mode } */
397 BARYCENTRIC(pixel, 0, 0)
398 BARYCENTRIC(centroid, 0, 0)
399 BARYCENTRIC(sample, 0, 0)
400 /* src[] = { sample_id }.  const_index[] = { interp_mode } */
401 BARYCENTRIC(at_sample, 1, 1)
402 /* src[] = { offset.xy }.  const_index[] = { interp_mode } */
403 BARYCENTRIC(at_offset, 1, 2)
404 
405 /*
406  * Load operations pull data from some piece of GPU memory.  All load
407  * operations operate in terms of offsets into some piece of theoretical
408  * memory.  Loads from externally visible memory (UBO and SSBO) simply take a
409  * byte offset as a source.  Loads from opaque memory (uniforms, inputs, etc.)
410  * take a base+offset pair where the base (const_index[0]) gives the location
411  * of the start of the variable being loaded and and the offset source is a
412  * offset into that variable.
413  *
414  * Uniform load operations have a second "range" index that specifies the
415  * range (starting at base) of the data from which we are loading.  If
416  * const_index[1] == 0, then the range is unknown.
417  *
418  * Some load operations such as UBO/SSBO load and per_vertex loads take an
419  * additional source to specify which UBO/SSBO/vertex to load from.
420  *
421  * The exact address type depends on the lowering pass that generates the
422  * load/store intrinsics.  Typically, this is vec4 units for things such as
423  * varying slots and float units for fragment shader inputs.  UBO and SSBO
424  * offsets are always in bytes.
425  */
426 
427 #define LOAD(name, srcs, num_indices, idx0, idx1, idx2, flags) \
428    INTRINSIC(load_##name, srcs, ARR(1, 1, 1, 1), true, 0, 0, num_indices, idx0, idx1, idx2, flags)
429 
430 /* src[] = { offset }. const_index[] = { base, range } */
431 LOAD(uniform, 1, 2, BASE, RANGE, xx, NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER)
432 /* src[] = { buffer_index, offset }. No const_index */
433 LOAD(ubo, 2, 0, xx, xx, xx, NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER)
434 /* src[] = { offset }. const_index[] = { base, component } */
435 LOAD(input, 1, 2, BASE, COMPONENT, xx, NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER)
436 /* src[] = { vertex, offset }. const_index[] = { base, component } */
437 LOAD(per_vertex_input, 2, 2, BASE, COMPONENT, xx, NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER)
438 /* src[] = { barycoord, offset }. const_index[] = { base, component } */
439 INTRINSIC(load_interpolated_input, 2, ARR(2, 1), true, 0, 0,
440           2, BASE, COMPONENT, xx,
441           NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER)
442 
443 /* src[] = { buffer_index, offset }. No const_index */
444 LOAD(ssbo, 2, 0, xx, xx, xx, NIR_INTRINSIC_CAN_ELIMINATE)
445 /* src[] = { offset }. const_index[] = { base, component } */
446 LOAD(output, 1, 2, BASE, COMPONENT, xx, NIR_INTRINSIC_CAN_ELIMINATE)
447 /* src[] = { vertex, offset }. const_index[] = { base, component } */
448 LOAD(per_vertex_output, 2, 2, BASE, COMPONENT, xx, NIR_INTRINSIC_CAN_ELIMINATE)
449 /* src[] = { offset }. const_index[] = { base } */
450 LOAD(shared, 1, 1, BASE, xx, xx, NIR_INTRINSIC_CAN_ELIMINATE)
451 /* src[] = { offset }. const_index[] = { base, range } */
452 LOAD(push_constant, 1, 2, BASE, RANGE, xx,
453      NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER)
454 
455 /*
456  * Stores work the same way as loads, except now the first source is the value
457  * to store and the second (and possibly third) source specify where to store
458  * the value.  SSBO and shared memory stores also have a write mask as
459  * const_index[0].
460  */
461 
462 #define STORE(name, srcs, num_indices, idx0, idx1, idx2, flags) \
463    INTRINSIC(store_##name, srcs, ARR(0, 1, 1, 1), false, 0, 0, num_indices, idx0, idx1, idx2, flags)
464 
465 /* src[] = { value, offset }. const_index[] = { base, write_mask, component } */
466 STORE(output, 2, 3, BASE, WRMASK, COMPONENT, 0)
467 /* src[] = { value, vertex, offset }.
468  * const_index[] = { base, write_mask, component }
469  */
470 STORE(per_vertex_output, 3, 3, BASE, WRMASK, COMPONENT, 0)
471 /* src[] = { value, block_index, offset }. const_index[] = { write_mask } */
472 STORE(ssbo, 3, 1, WRMASK, xx, xx, 0)
473 /* src[] = { value, offset }. const_index[] = { base, write_mask } */
474 STORE(shared, 2, 2, BASE, WRMASK, xx, 0)
475 
476 LAST_INTRINSIC(store_shared)
477 
478 #undef DEFINE_SYSTEM_VALUE
479 #undef INTRINSIC
480 #undef LAST_INTRINSIC
481