uint32_t
brw_depthbuffer_format(struct brw_context *brw)
{
struct gl_context *ctx = &brw->ctx;
struct gl_framebuffer *fb = ctx->DrawBuffer;
struct intel_renderbuffer *drb = intel_get_renderbuffer(fb, BUFFER_DEPTH);
struct intel_renderbuffer *srb;
if (!drb &&
(srb = intel_get_renderbuffer(fb, BUFFER_STENCIL)) &&
!srb->mt->stencil_mt &&
(intel_rb_format(srb) == MESA_FORMAT_Z24_UNORM_S8_UINT ||
intel_rb_format(srb) == MESA_FORMAT_Z32_FLOAT_S8X24_UINT)) {
drb = srb;
}
if (!drb)
return BRW_DEPTHFORMAT_D32_FLOAT;
return brw_depth_format(brw, drb->mt->format);
}
/**
* Emit packets to perform a depth/HiZ resolve or fast depth/stencil clear.
*
* See the "Optimized Depth Buffer Clear and/or Stencil Buffer Clear" section
* of the hardware documentation for details.
*/
void
gen8_hiz_exec(struct brw_context *brw, struct intel_mipmap_tree *mt,
unsigned int level, unsigned int layer, enum gen6_hiz_op op)
{
if (op == GEN6_HIZ_OP_NONE)
return;
assert(mt->first_level == 0);
assert(mt->logical_depth0 >= 1);
/* The basic algorithm is:
* - If needed, emit 3DSTATE_{DEPTH,HIER_DEPTH,STENCIL}_BUFFER and
* 3DSTATE_CLEAR_PARAMS packets to set up the relevant buffers.
* - If needed, emit 3DSTATE_DRAWING_RECTANGLE.
* - Emit 3DSTATE_WM_HZ_OP with a bit set for the particular operation.
* - Do a special PIPE_CONTROL to trigger an implicit rectangle primitive.
* - Emit 3DSTATE_WM_HZ_OP with no bits set to return to normal rendering.
*/
emit_depth_packets(brw, mt,
brw_depth_format(brw, mt->format),
BRW_SURFACE_2D,
true, /* depth writes */
NULL, false, 0, /* no stencil for now */
true, /* hiz */
mt->logical_width0,
mt->logical_height0,
mt->logical_depth0,
level,
layer); /* min_array_element */
unsigned rect_width = minify(mt->logical_width0, level);
unsigned rect_height = minify(mt->logical_height0, level);
BEGIN_BATCH(4);
OUT_BATCH(_3DSTATE_DRAWING_RECTANGLE << 16 | (4 - 2));
OUT_BATCH(0);
OUT_BATCH(((rect_width - 1) & 0xffff) | ((rect_height - 1) << 16));
OUT_BATCH(0);
ADVANCE_BATCH();
/* Emit 3DSTATE_WM_HZ_OP to override pipeline state for the particular
* resolve or clear operation we want to perform.
*/
uint32_t dw1 = 0;
switch (op) {
case GEN6_HIZ_OP_DEPTH_RESOLVE:
dw1 |= GEN8_WM_HZ_DEPTH_RESOLVE;
break;
case GEN6_HIZ_OP_HIZ_RESOLVE:
dw1 |= GEN8_WM_HZ_HIZ_RESOLVE;
break;
case GEN6_HIZ_OP_DEPTH_CLEAR:
dw1 |= GEN8_WM_HZ_DEPTH_CLEAR;
break;
case GEN6_HIZ_OP_NONE:
assert(!"Should not get here.");
}
if (mt->num_samples > 0)
dw1 |= SET_FIELD(ffs(mt->num_samples) - 1, GEN8_WM_HZ_NUM_SAMPLES);
BEGIN_BATCH(5);
OUT_BATCH(_3DSTATE_WM_HZ_OP << 16 | (5 - 2));
OUT_BATCH(dw1);
OUT_BATCH(0);
OUT_BATCH(SET_FIELD(rect_width, GEN8_WM_HZ_CLEAR_RECTANGLE_X_MAX) |
SET_FIELD(rect_height, GEN8_WM_HZ_CLEAR_RECTANGLE_Y_MAX));
OUT_BATCH(SET_FIELD(0xFFFF, GEN8_WM_HZ_SAMPLE_MASK));
ADVANCE_BATCH();
/* Emit a PIPE_CONTROL with "Post-Sync Operation" set to "Write Immediate
* Data", and no other bits set. This causes 3DSTATE_WM_HZ_OP's state to
* take effect, and spawns a rectangle primitive.
*/
brw_emit_pipe_control_write(brw,
PIPE_CONTROL_WRITE_IMMEDIATE,
brw->batch.workaround_bo, 0, 0, 0);
/* Emit 3DSTATE_WM_HZ_OP again to disable the state overrides. */
BEGIN_BATCH(5);
OUT_BATCH(_3DSTATE_WM_HZ_OP << 16 | (5 - 2));
OUT_BATCH(0);
OUT_BATCH(0);
OUT_BATCH(0);
OUT_BATCH(0);
ADVANCE_BATCH();
/* Mark this buffer as needing a TC flush, as we've rendered to it. */
brw_render_cache_set_add_bo(brw, mt->region->bo);
/* We've clobbered all of the depth packets, and the drawing rectangle,
* so we need to ensure those packets are re-emitted before the next
* primitive.
*
* Setting _NEW_DEPTH and _NEW_BUFFERS covers it, but is rather overkill.
*/
brw->state.dirty.mesa |= _NEW_DEPTH | _NEW_BUFFERS;
}