2 * Copyright © 2015 Intel Corporation
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:
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
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
24 #include "main/macros.h"
25 #include "brw_context.h"
31 #include "brw_program.h"
32 #include "glsl/ir_optimization.h"
33 #include "glsl/glsl_parser_extras.h"
34 #include "main/shaderapi.h"
37 * Performs a compile of the shader stages even when we don't know
38 * what non-orthogonal state will be set, in the hope that it reflects
39 * the eventual NOS used, and thus allows us to produce link failures.
42 brw_shader_precompile(struct gl_context
*ctx
,
43 struct gl_shader_program
*sh_prog
)
45 struct gl_shader
*vs
= sh_prog
->_LinkedShaders
[MESA_SHADER_VERTEX
];
46 struct gl_shader
*gs
= sh_prog
->_LinkedShaders
[MESA_SHADER_GEOMETRY
];
47 struct gl_shader
*fs
= sh_prog
->_LinkedShaders
[MESA_SHADER_FRAGMENT
];
48 struct gl_shader
*cs
= sh_prog
->_LinkedShaders
[MESA_SHADER_COMPUTE
];
50 if (fs
&& !brw_fs_precompile(ctx
, sh_prog
, fs
->Program
))
53 if (gs
&& !brw_gs_precompile(ctx
, sh_prog
, gs
->Program
))
56 if (vs
&& !brw_vs_precompile(ctx
, sh_prog
, vs
->Program
))
59 if (cs
&& !brw_cs_precompile(ctx
, sh_prog
, cs
->Program
))
66 brw_lower_packing_builtins(struct brw_context
*brw
,
67 gl_shader_stage shader_type
,
70 const struct brw_compiler
*compiler
= brw
->intelScreen
->compiler
;
72 int ops
= LOWER_PACK_SNORM_2x16
73 | LOWER_UNPACK_SNORM_2x16
74 | LOWER_PACK_UNORM_2x16
75 | LOWER_UNPACK_UNORM_2x16
;
77 if (compiler
->scalar_stage
[shader_type
]) {
78 ops
|= LOWER_UNPACK_UNORM_4x8
79 | LOWER_UNPACK_SNORM_4x8
80 | LOWER_PACK_UNORM_4x8
81 | LOWER_PACK_SNORM_4x8
;
85 /* Gen7 introduced the f32to16 and f16to32 instructions, which can be
86 * used to execute packHalf2x16 and unpackHalf2x16. For AOS code, no
87 * lowering is needed. For SOA code, the Half2x16 ops must be
90 if (compiler
->scalar_stage
[shader_type
]) {
91 ops
|= LOWER_PACK_HALF_2x16_TO_SPLIT
92 | LOWER_UNPACK_HALF_2x16_TO_SPLIT
;
95 ops
|= LOWER_PACK_HALF_2x16
96 | LOWER_UNPACK_HALF_2x16
;
99 lower_packing_builtins(ir
, ops
);
103 process_glsl_ir(gl_shader_stage stage
,
104 struct brw_context
*brw
,
105 struct gl_shader_program
*shader_prog
,
106 struct gl_shader
*shader
)
108 struct gl_context
*ctx
= &brw
->ctx
;
109 const struct brw_compiler
*compiler
= brw
->intelScreen
->compiler
;
110 const struct gl_shader_compiler_options
*options
=
111 &ctx
->Const
.ShaderCompilerOptions
[shader
->Stage
];
113 /* Temporary memory context for any new IR. */
114 void *mem_ctx
= ralloc_context(NULL
);
116 ralloc_adopt(mem_ctx
, shader
->ir
);
118 /* lower_packing_builtins() inserts arithmetic instructions, so it
119 * must precede lower_instructions().
121 brw_lower_packing_builtins(brw
, shader
->Stage
, shader
->ir
);
122 do_mat_op_to_vec(shader
->ir
);
123 const int bitfield_insert
= brw
->gen
>= 7 ? BITFIELD_INSERT_TO_BFM_BFI
: 0;
124 lower_instructions(shader
->ir
,
135 /* Pre-gen6 HW can only nest if-statements 16 deep. Beyond this,
136 * if-statements need to be flattened.
139 lower_if_to_cond_assign(shader
->ir
, 16);
141 do_lower_texture_projection(shader
->ir
);
142 brw_lower_texture_gradients(brw
, shader
->ir
);
143 do_vec_index_to_cond_assign(shader
->ir
);
144 lower_vector_insert(shader
->ir
, true);
145 lower_offset_arrays(shader
->ir
);
146 brw_do_lower_unnormalized_offset(shader
->ir
);
147 lower_noise(shader
->ir
);
148 lower_quadop_vector(shader
->ir
, false);
150 bool lowered_variable_indexing
=
151 lower_variable_index_to_cond_assign((gl_shader_stage
)stage
,
153 options
->EmitNoIndirectInput
,
154 options
->EmitNoIndirectOutput
,
155 options
->EmitNoIndirectTemp
,
156 options
->EmitNoIndirectUniform
);
158 if (unlikely(brw
->perf_debug
&& lowered_variable_indexing
)) {
159 perf_debug("Unsupported form of variable indexing in %s; falling "
160 "back to very inefficient code generation\n",
161 _mesa_shader_stage_to_abbrev(shader
->Stage
));
168 if (compiler
->scalar_stage
[shader
->Stage
]) {
169 brw_do_channel_expressions(shader
->ir
);
170 brw_do_vector_splitting(shader
->ir
);
173 progress
= do_lower_jumps(shader
->ir
, true, true,
174 true, /* main return */
175 false, /* continue */
179 progress
= do_common_optimization(shader
->ir
, true, true,
180 options
, ctx
->Const
.NativeIntegers
) || progress
;
183 validate_ir_tree(shader
->ir
);
185 /* Now that we've finished altering the linked IR, reparent any live IR back
186 * to the permanent memory context, and free the temporary one (discarding any
187 * junk we optimized away).
189 reparent_ir(shader
->ir
, shader
->ir
);
190 ralloc_free(mem_ctx
);
192 if (ctx
->_Shader
->Flags
& GLSL_DUMP
) {
193 fprintf(stderr
, "\n");
194 fprintf(stderr
, "GLSL IR for linked %s program %d:\n",
195 _mesa_shader_stage_to_string(shader
->Stage
),
197 _mesa_print_ir(stderr
, shader
->ir
, NULL
);
198 fprintf(stderr
, "\n");
203 brw_link_shader(struct gl_context
*ctx
, struct gl_shader_program
*shProg
)
205 struct brw_context
*brw
= brw_context(ctx
);
206 const struct brw_compiler
*compiler
= brw
->intelScreen
->compiler
;
209 for (stage
= 0; stage
< ARRAY_SIZE(shProg
->_LinkedShaders
); stage
++) {
210 struct gl_shader
*shader
= shProg
->_LinkedShaders
[stage
];
214 struct gl_program
*prog
=
215 ctx
->Driver
.NewProgram(ctx
, _mesa_shader_stage_to_program(stage
),
219 prog
->Parameters
= _mesa_new_parameter_list();
221 _mesa_copy_linked_program_data((gl_shader_stage
) stage
, shProg
, prog
);
223 process_glsl_ir((gl_shader_stage
) stage
, brw
, shProg
, shader
);
225 /* Make a pass over the IR to add state references for any built-in
226 * uniforms that are used. This has to be done now (during linking).
227 * Code generation doesn't happen until the first time this shader is
228 * used for rendering. Waiting until then to generate the parameters is
229 * too late. At that point, the values for the built-in uniforms won't
230 * get sent to the shader.
232 foreach_in_list(ir_instruction
, node
, shader
->ir
) {
233 ir_variable
*var
= node
->as_variable();
235 if ((var
== NULL
) || (var
->data
.mode
!= ir_var_uniform
)
236 || (strncmp(var
->name
, "gl_", 3) != 0))
239 const ir_state_slot
*const slots
= var
->get_state_slots();
240 assert(slots
!= NULL
);
242 for (unsigned int i
= 0; i
< var
->get_num_state_slots(); i
++) {
243 _mesa_add_state_reference(prog
->Parameters
,
244 (gl_state_index
*) slots
[i
].tokens
);
248 do_set_program_inouts(shader
->ir
, prog
, shader
->Stage
);
250 prog
->SamplersUsed
= shader
->active_samplers
;
251 prog
->ShadowSamplers
= shader
->shadow_samplers
;
252 _mesa_update_shader_textures_used(shProg
, prog
);
254 _mesa_reference_program(ctx
, &shader
->Program
, prog
);
256 brw_add_texrect_params(prog
);
258 prog
->nir
= brw_create_nir(brw
, shProg
, prog
, (gl_shader_stage
) stage
,
259 compiler
->scalar_stage
[stage
]);
261 _mesa_reference_program(ctx
, &prog
, NULL
);
264 if ((ctx
->_Shader
->Flags
& GLSL_DUMP
) && shProg
->Name
!= 0) {
265 for (unsigned i
= 0; i
< shProg
->NumShaders
; i
++) {
266 const struct gl_shader
*sh
= shProg
->Shaders
[i
];
270 fprintf(stderr
, "GLSL %s shader %d source for linked program %d:\n",
271 _mesa_shader_stage_to_string(sh
->Stage
),
273 fprintf(stderr
, "%s", sh
->Source
);
274 fprintf(stderr
, "\n");
278 if (brw
->precompile
&& !brw_shader_precompile(ctx
, shProg
))