/*
* Copyright © 2011 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.
*/
/**
* @file gen7_sol_state.c
*
* Controls the stream output logic (SOL) stage of the gen7 hardware, which is
* used to implement GL_EXT_transform_feedback.
*/
#include "brw_context.h"
#include "brw_state.h"
#include "brw_defines.h"
#include "intel_batchbuffer.h"
#include "intel_buffer_objects.h"
#include "main/transformfeedback.h"
static void
upload_3dstate_so_buffers(struct brw_context *brw)
{
struct gl_context *ctx = &brw->ctx;
/* BRW_NEW_VERTEX_PROGRAM */
const struct gl_shader_program *vs_prog =
ctx->Shader.CurrentVertexProgram;
const struct gl_transform_feedback_info *linked_xfb_info =
&vs_prog->LinkedTransformFeedback;
/* BRW_NEW_TRANSFORM_FEEDBACK */
struct gl_transform_feedback_object *xfb_obj =
ctx->TransformFeedback.CurrentObject;
int i;
/* Set up the up to 4 output buffers. These are the ranges defined in the
* gl_transform_feedback_object.
*/
for (i = 0; i < 4; i++) {
struct intel_buffer_object *bufferobj =
intel_buffer_object(xfb_obj->Buffers[i]);
drm_intel_bo *bo;
uint32_t start, end;
uint32_t stride;
if (!xfb_obj->Buffers[i]) {
/* The pitch of 0 in this command indicates that the buffer is
* unbound and won't be written to.
*/
BEGIN_BATCH(4);
OUT_BATCH(_3DSTATE_SO_BUFFER << 16 | (4 - 2));
OUT_BATCH((i << SO_BUFFER_INDEX_SHIFT));
OUT_BATCH(0);
OUT_BATCH(0);
ADVANCE_BATCH();
continue;
}
bo = intel_bufferobj_buffer(brw, bufferobj, INTEL_WRITE_PART);
stride = linked_xfb_info->BufferStride[i] * 4;
start = xfb_obj->Offset[i];
end = ALIGN(start + xfb_obj->Size[i], 4);
BEGIN_BATCH(4);
OUT_BATCH(_3DSTATE_SO_BUFFER << 16 | (4 - 2));
OUT_BATCH((i << SO_BUFFER_INDEX_SHIFT) | stride);
OUT_RELOC(bo, I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER, start);
OUT_RELOC(bo, I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER, end);
ADVANCE_BATCH();
}
}
/**
* Outputs the 3DSTATE_SO_DECL_LIST command.
*
* The data output is a series of 64-bit entries containing a SO_DECL per
* stream. We only have one stream of rendering coming out of the GS unit, so
* we only emit stream 0 (low 16 bits) SO_DECLs.
*/
static void
upload_3dstate_so_decl_list(struct brw_context *brw,
const struct brw_vue_map *vue_map)
{
struct gl_context *ctx = &brw->ctx;
/* BRW_NEW_VERTEX_PROGRAM */
const struct gl_shader_program *vs_prog =
ctx->Shader.CurrentVertexProgram;
/* BRW_NEW_TRANSFORM_FEEDBACK */
const struct gl_transform_feedback_info *linked_xfb_info =
&vs_prog->LinkedTransformFeedback;
int i;
uint16_t so_decl[128];
int buffer_mask = 0;
int next_offset[4] = {0, 0, 0, 0};
STATIC_ASSERT(ARRAY_SIZE(so_decl) >= MAX_PROGRAM_OUTPUTS);
/* Construct the list of SO_DECLs to be emitted. The formatting of the
* command is feels strange -- each dword pair contains a SO_DECL per stream.
*/
for (i = 0; i < linked_xfb_info->NumOutputs; i++) {
int buffer = linked_xfb_info->Outputs[i].OutputBuffer;
uint16_t decl = 0;
int varying = linked_xfb_info->Outputs[i].OutputRegister;
unsigned component_mask =
(1 << linked_xfb_info->Outputs[i].NumComponents) - 1;
/* gl_PointSize is stored in VARYING_SLOT_PSIZ.w. */
if (varying == VARYING_SLOT_PSIZ) {
assert(linked_xfb_info
->Outputs
[i
].
NumComponents == 1); component_mask <<= 3;
} else {
component_mask <<= linked_xfb_info->Outputs[i].ComponentOffset;
}
buffer_mask |= 1 << buffer;
decl |= buffer << SO_DECL_OUTPUT_BUFFER_SLOT_SHIFT;
decl |= vue_map->varying_to_slot[varying] <<
SO_DECL_REGISTER_INDEX_SHIFT;
decl |= component_mask << SO_DECL_COMPONENT_MASK_SHIFT;
/* This assert should be true until GL_ARB_transform_feedback_instanced
* is added and we start using the hole flag.
*/
assert(linked_xfb_info
->Outputs
[i
].
DstOffset == next_offset
[buffer
]);
next_offset[buffer] += linked_xfb_info->Outputs[i].NumComponents;
so_decl[i] = decl;
}
BEGIN_BATCH(linked_xfb_info->NumOutputs * 2 + 3);
OUT_BATCH(_3DSTATE_SO_DECL_LIST << 16 |
(linked_xfb_info->NumOutputs * 2 + 1));
OUT_BATCH((buffer_mask << SO_STREAM_TO_BUFFER_SELECTS_0_SHIFT) |
(0 << SO_STREAM_TO_BUFFER_SELECTS_1_SHIFT) |
(0 << SO_STREAM_TO_BUFFER_SELECTS_2_SHIFT) |
(0 << SO_STREAM_TO_BUFFER_SELECTS_3_SHIFT));
OUT_BATCH((linked_xfb_info->NumOutputs << SO_NUM_ENTRIES_0_SHIFT) |
(0 << SO_NUM_ENTRIES_1_SHIFT) |
(0 << SO_NUM_ENTRIES_2_SHIFT) |
(0 << SO_NUM_ENTRIES_3_SHIFT));
for (i = 0; i < linked_xfb_info->NumOutputs; i++) {
OUT_BATCH(so_decl[i]);
OUT_BATCH(0);
}
ADVANCE_BATCH();
}
static void
upload_3dstate_streamout(struct brw_context *brw, bool active,
const struct brw_vue_map *vue_map)
{
struct gl_context *ctx = &brw->ctx;
/* BRW_NEW_TRANSFORM_FEEDBACK */
struct gl_transform_feedback_object *xfb_obj =
ctx->TransformFeedback.CurrentObject;
uint32_t dw1 = 0, dw2 = 0;
int i;
if (active) {
int urb_entry_read_offset = 0;
int urb_entry_read_length = (vue_map->num_slots + 1) / 2 -
urb_entry_read_offset;
dw1 |= SO_FUNCTION_ENABLE;
dw1 |= SO_STATISTICS_ENABLE;
/* _NEW_LIGHT */
if (ctx->Light.ProvokingVertex != GL_FIRST_VERTEX_CONVENTION)
dw1 |= SO_REORDER_TRAILING;
for (i = 0; i < 4; i++) {
if (xfb_obj->Buffers[i]) {
dw1 |= SO_BUFFER_ENABLE(i);
}
}
/* We always read the whole vertex. This could be reduced at some
* point by reading less and offsetting the register index in the
* SO_DECLs.
*/
dw2 |= urb_entry_read_offset << SO_STREAM_0_VERTEX_READ_OFFSET_SHIFT;
dw2 |= (urb_entry_read_length - 1) <<
SO_STREAM_0_VERTEX_READ_LENGTH_SHIFT;
}
BEGIN_BATCH(3);
OUT_BATCH(_3DSTATE_STREAMOUT << 16 | (3 - 2));
OUT_BATCH(dw1);
OUT_BATCH(dw2);
ADVANCE_BATCH();
}
static void
upload_sol_state(struct brw_context *brw)
{
struct gl_context *ctx = &brw->ctx;
/* BRW_NEW_TRANSFORM_FEEDBACK */
bool active = _mesa_is_xfb_active_and_unpaused(ctx);
if (active) {
upload_3dstate_so_buffers(brw);
/* BRW_NEW_VUE_MAP_GEOM_OUT */
upload_3dstate_so_decl_list(brw, &brw->vue_map_geom_out);
}
/* Finally, set up the SOL stage. This command must always follow updates to
* the nonpipelined SOL state (3DSTATE_SO_BUFFER, 3DSTATE_SO_DECL_LIST) or
* MMIO register updates (current performed by the kernel at each batch
* emit).
*/
upload_3dstate_streamout(brw, active, &brw->vue_map_geom_out);
}
const struct brw_tracked_state gen7_sol_state = {
.dirty = {
.mesa = (_NEW_LIGHT),
.brw = (BRW_NEW_BATCH |
BRW_NEW_VERTEX_PROGRAM |
BRW_NEW_VUE_MAP_GEOM_OUT |
BRW_NEW_TRANSFORM_FEEDBACK)
},
.emit = upload_sol_state,
};
void
gen7_begin_transform_feedback(struct gl_context *ctx, GLenum mode,
struct gl_transform_feedback_object *obj)
{
struct brw_context *brw = brw_context(ctx);
intel_batchbuffer_flush(brw);
brw->batch.needs_sol_reset = true;
}
void
gen7_end_transform_feedback(struct gl_context *ctx,
struct gl_transform_feedback_object *obj)
{
/* Because we have to rely on the kernel to reset our SO write offsets, and
* we only get to do it once per batchbuffer, flush the batch after feedback
* so another transform feedback can get the write offset reset it needs.
*
* This also covers any cache flushing required.
*/
struct brw_context *brw = brw_context(ctx);
intel_batchbuffer_flush(brw);
}