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/*
* Copyright © 2015 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 "brw_context.h"
#include "brw_state.h"
#include "brw_defines.h"
#include "intel_batchbuffer.h"
#include "intel_buffer_objects.h"
#include "program/prog_parameter.h"
/**
* Creates a streamed BO containing the push constants for the VS or GS on
* gen6+.
*
* Push constants are constant values (such as GLSL uniforms) that are
* pre-loaded into a shader stage's register space at thread spawn time.
*
* Not all GLSL uniforms will be uploaded as push constants: The hardware has
* a limitation of 32 or 64 EU registers (256 or 512 floats) per stage to be
* uploaded as push constants, while GL 4.4 requires at least 1024 components
* to be usable for the VS. Plus, currently we always use pull constants
* instead of push constants when doing variable-index array access.
*
* See brw_curbe.c for the equivalent gen4/5 code.
*/
void
gen6_upload_push_constants(struct brw_context *brw,
const struct gl_program *prog,
const struct brw_stage_prog_data *prog_data,
struct brw_stage_state *stage_state)
{
const struct gen_device_info *devinfo = &brw->screen->devinfo;
struct gl_context *ctx = &brw->ctx;
if (prog_data->nr_params == 0) {
stage_state->push_const_size = 0;
} else {
/* Updates the ParamaterValues[i] pointers for all parameters of the
* basic type of PROGRAM_STATE_VAR.
*/
/* XXX: Should this happen somewhere before to get our state flag set? */
if (prog)
_mesa_load_state_parameters(ctx, prog->Parameters);
int i;
const int size = prog_data->nr_params * sizeof(gl_constant_value);
gl_constant_value *param;
if (devinfo->gen >= 8 || devinfo->is_haswell) {
param = intel_upload_space(brw, size, 32,
&stage_state->push_const_bo,
&stage_state->push_const_offset);
} else {
param = brw_state_batch(brw, size, 32,
&stage_state->push_const_offset);
}
STATIC_ASSERT(sizeof(gl_constant_value) == sizeof(float));
/* _NEW_PROGRAM_CONSTANTS
*
* Also _NEW_TRANSFORM -- we may reference clip planes other than as a
* side effect of dereferencing uniforms, so _NEW_PROGRAM_CONSTANTS
* wouldn't be set for them.
*/
for (i = 0; i < prog_data->nr_params; i++) {
param[i] = *prog_data->param[i];
}
if (0) {
fprintf(stderr, "%s constants:\n",
_mesa_shader_stage_to_string(stage_state->stage));
for (i = 0; i < prog_data->nr_params; i++) {
if ((i & 7) == 0)
fprintf(stderr, "g%d: ",
prog_data->dispatch_grf_start_reg + i / 8);
fprintf(stderr, "%8f ", param[i].f);
if ((i & 7) == 7)
fprintf(stderr, "\n");
}
if ((i & 7) != 0)
fprintf(stderr, "\n");
fprintf(stderr, "\n");
}
stage_state->push_const_size = ALIGN(prog_data->nr_params, 8) / 8;
/* We can only push 32 registers of constants at a time. */
/* From the SNB PRM (vol2, part 1, section 3.2.1.4: 3DSTATE_CONSTANT_VS:
*
* "The sum of all four read length fields (each incremented to
* represent the actual read length) must be less than or equal to
* 32"
*
* From the IVB PRM (vol2, part 1, section 3.2.1.3: 3DSTATE_CONSTANT_VS:
*
* "The sum of all four read length fields must be less than or
* equal to the size of 64"
*
* The other shader stages all match the VS's limits.
*/
assert(stage_state->push_const_size <= 32);
}
stage_state->push_constants_dirty = true;
}
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