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11 * The above copyright notice and this permission notice (including the next
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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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 struct gl_context
*ctx
= &brw
->ctx
;
54 if (prog_data
->nr_params
== 0) {
55 stage_state
->push_const_size
= 0;
57 /* Updates the ParamaterValues[i] pointers for all parameters of the
58 * basic type of PROGRAM_STATE_VAR.
60 /* XXX: Should this happen somewhere before to get our state flag set? */
62 _mesa_load_state_parameters(ctx
, prog
->Parameters
);
65 const int size
= prog_data
->nr_params
* sizeof(gl_constant_value
);
66 gl_constant_value
*param
;
67 if (brw
->gen
>= 8 || brw
->is_haswell
) {
68 param
= intel_upload_space(brw
, size
, 32, &brw
->curbe
.curbe_bo
,
69 &stage_state
->push_const_offset
);
71 param
= brw_state_batch(brw
, size
, 32,
72 &stage_state
->push_const_offset
);
75 STATIC_ASSERT(sizeof(gl_constant_value
) == sizeof(float));
77 /* _NEW_PROGRAM_CONSTANTS
79 * Also _NEW_TRANSFORM -- we may reference clip planes other than as a
80 * side effect of dereferencing uniforms, so _NEW_PROGRAM_CONSTANTS
81 * wouldn't be set for them.
83 for (i
= 0; i
< prog_data
->nr_params
; i
++) {
84 param
[i
] = *prog_data
->param
[i
];
88 fprintf(stderr
, "%s constants:\n",
89 _mesa_shader_stage_to_string(stage_state
->stage
));
90 for (i
= 0; i
< prog_data
->nr_params
; i
++) {
92 fprintf(stderr
, "g%d: ",
93 prog_data
->dispatch_grf_start_reg
+ i
/ 8);
94 fprintf(stderr
, "%8f ", param
[i
].f
);
96 fprintf(stderr
, "\n");
99 fprintf(stderr
, "\n");
100 fprintf(stderr
, "\n");
103 stage_state
->push_const_size
= ALIGN(prog_data
->nr_params
, 8) / 8;
104 /* We can only push 32 registers of constants at a time. */
106 /* From the SNB PRM (vol2, part 1, section 3.2.1.4: 3DSTATE_CONSTANT_VS:
108 * "The sum of all four read length fields (each incremented to
109 * represent the actual read length) must be less than or equal to
112 * From the IVB PRM (vol2, part 1, section 3.2.1.3: 3DSTATE_CONSTANT_VS:
114 * "The sum of all four read length fields must be less than or
115 * equal to the size of 64"
117 * The other shader stages all match the VS's limits.
119 assert(stage_state
->push_const_size
<= 32);