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11 * The above copyright notice and this permission notice (including the next
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24 #include "brw_context.h"
25 #include "brw_state.h"
26 #include "brw_defines.h"
27 #include "intel_batchbuffer.h"
28 #include "intel_buffer_objects.h"
29 #include "program/prog_parameter.h"
32 * Creates a streamed BO containing the push constants for the VS or GS on
35 * Push constants are constant values (such as GLSL uniforms) that are
36 * pre-loaded into a shader stage's register space at thread spawn time.
38 * Not all GLSL uniforms will be uploaded as push constants: The hardware has
39 * a limitation of 32 or 64 EU registers (256 or 512 floats) per stage to be
40 * uploaded as push constants, while GL 4.4 requires at least 1024 components
41 * to be usable for the VS. Plus, currently we always use pull constants
42 * instead of push constants when doing variable-index array access.
44 * See brw_curbe.c for the equivalent gen4/5 code.
47 gen6_upload_push_constants(struct brw_context
*brw
,
48 const struct gl_program
*prog
,
49 const struct brw_stage_prog_data
*prog_data
,
50 struct brw_stage_state
*stage_state
)
52 const struct gen_device_info
*devinfo
= &brw
->screen
->devinfo
;
53 struct gl_context
*ctx
= &brw
->ctx
;
55 if (prog_data
->nr_params
== 0) {
56 stage_state
->push_const_size
= 0;
58 /* Updates the ParamaterValues[i] pointers for all parameters of the
59 * basic type of PROGRAM_STATE_VAR.
61 /* XXX: Should this happen somewhere before to get our state flag set? */
63 _mesa_load_state_parameters(ctx
, prog
->Parameters
);
66 const int size
= prog_data
->nr_params
* sizeof(gl_constant_value
);
67 gl_constant_value
*param
;
68 if (devinfo
->gen
>= 8 || devinfo
->is_haswell
) {
69 param
= intel_upload_space(brw
, size
, 32,
70 &stage_state
->push_const_bo
,
71 &stage_state
->push_const_offset
);
73 param
= brw_state_batch(brw
, size
, 32,
74 &stage_state
->push_const_offset
);
77 STATIC_ASSERT(sizeof(gl_constant_value
) == sizeof(float));
79 /* _NEW_PROGRAM_CONSTANTS
81 * Also _NEW_TRANSFORM -- we may reference clip planes other than as a
82 * side effect of dereferencing uniforms, so _NEW_PROGRAM_CONSTANTS
83 * wouldn't be set for them.
85 for (i
= 0; i
< prog_data
->nr_params
; i
++) {
86 param
[i
] = *prog_data
->param
[i
];
90 fprintf(stderr
, "%s constants:\n",
91 _mesa_shader_stage_to_string(stage_state
->stage
));
92 for (i
= 0; i
< prog_data
->nr_params
; i
++) {
94 fprintf(stderr
, "g%d: ",
95 prog_data
->dispatch_grf_start_reg
+ i
/ 8);
96 fprintf(stderr
, "%8f ", param
[i
].f
);
98 fprintf(stderr
, "\n");
101 fprintf(stderr
, "\n");
102 fprintf(stderr
, "\n");
105 stage_state
->push_const_size
= ALIGN(prog_data
->nr_params
, 8) / 8;
106 /* We can only push 32 registers of constants at a time. */
108 /* From the SNB PRM (vol2, part 1, section 3.2.1.4: 3DSTATE_CONSTANT_VS:
110 * "The sum of all four read length fields (each incremented to
111 * represent the actual read length) must be less than or equal to
114 * From the IVB PRM (vol2, part 1, section 3.2.1.3: 3DSTATE_CONSTANT_VS:
116 * "The sum of all four read length fields must be less than or
117 * equal to the size of 64"
119 * The other shader stages all match the VS's limits.
121 assert(stage_state
->push_const_size
<= 32);
124 stage_state
->push_constants_dirty
= true;
129 * Creates a temporary BO containing the pull constant data for the shader
130 * stage, and the SURFACE_STATE struct that points at it.
132 * Pull constants are GLSL uniforms (and other constant data) beyond what we
133 * could fit as push constants, or that have variable-index array access
134 * (which is easiest to support using pull constants, and avoids filling
135 * register space with mostly-unused data).
137 * Compare this path to brw_curbe.c for gen4/5 push constants, and
138 * gen6_vs_state.c for gen6+ push constants.
141 brw_upload_pull_constants(struct brw_context
*brw
,
142 GLbitfield64 brw_new_constbuf
,
143 const struct gl_program
*prog
,
144 struct brw_stage_state
*stage_state
,
145 const struct brw_stage_prog_data
*prog_data
)
148 uint32_t surf_index
= prog_data
->binding_table
.pull_constants_start
;
150 if (!prog_data
->nr_pull_params
) {
151 if (stage_state
->surf_offset
[surf_index
]) {
152 stage_state
->surf_offset
[surf_index
] = 0;
153 brw
->ctx
.NewDriverState
|= brw_new_constbuf
;
158 /* Updates the ParamaterValues[i] pointers for all parameters of the
159 * basic type of PROGRAM_STATE_VAR.
161 _mesa_load_state_parameters(&brw
->ctx
, prog
->Parameters
);
163 /* BRW_NEW_*_PROG_DATA | _NEW_PROGRAM_CONSTANTS */
164 uint32_t size
= prog_data
->nr_pull_params
* 4;
165 struct brw_bo
*const_bo
= NULL
;
166 uint32_t const_offset
;
167 gl_constant_value
*constants
= intel_upload_space(brw
, size
, 64,
168 &const_bo
, &const_offset
);
170 STATIC_ASSERT(sizeof(gl_constant_value
) == sizeof(float));
172 for (i
= 0; i
< prog_data
->nr_pull_params
; i
++) {
173 constants
[i
] = *prog_data
->pull_param
[i
];
177 for (i
= 0; i
< ALIGN(prog_data
->nr_pull_params
, 4) / 4; i
++) {
178 const gl_constant_value
*row
= &constants
[i
* 4];
179 fprintf(stderr
, "const surface %3d: %4.3f %4.3f %4.3f %4.3f\n",
180 i
, row
[0].f
, row
[1].f
, row
[2].f
, row
[3].f
);
184 brw_create_constant_surface(brw
, const_bo
, const_offset
, size
,
185 &stage_state
->surf_offset
[surf_index
]);
186 brw_bo_unreference(const_bo
);
188 brw
->ctx
.NewDriverState
|= brw_new_constbuf
;