/**************************************************************************
*
* Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
* Copyright 2009, 2012 Intel Corporation.
* All Rights Reserved.
*
* 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, sub license, 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 NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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 "main/glheader.h"
#include "main/mtypes.h"
#include "main/condrender.h"
#include "swrast/swrast.h"
#include "drivers/common/meta.h"
#include "intel_batchbuffer.h"
#include "intel_blit.h"
#include "intel_fbo.h"
#include "intel_mipmap_tree.h"
#include "intel_regions.h"
#include "brw_context.h"
#include "brw_blorp.h"
#define FILE_DEBUG_FLAG DEBUG_BLIT
static const char *buffer_names[] = {
[BUFFER_FRONT_LEFT] = "front",
[BUFFER_BACK_LEFT] = "back",
[BUFFER_FRONT_RIGHT] = "front right",
[BUFFER_BACK_RIGHT] = "back right",
[BUFFER_DEPTH] = "depth",
[BUFFER_STENCIL] = "stencil",
[BUFFER_ACCUM] = "accum",
[BUFFER_AUX0] = "aux0",
[BUFFER_COLOR0] = "color0",
[BUFFER_COLOR1] = "color1",
[BUFFER_COLOR2] = "color2",
[BUFFER_COLOR3] = "color3",
[BUFFER_COLOR4] = "color4",
[BUFFER_COLOR5] = "color5",
[BUFFER_COLOR6] = "color6",
[BUFFER_COLOR7] = "color7",
};
static void
debug_mask(const char *name, GLbitfield mask)
{
GLuint i;
if (unlikely(INTEL_DEBUG & DEBUG_BLIT)) {
DBG("%s clear:", name);
for (i = 0; i < BUFFER_COUNT; i++) {
if (mask & (1 << i))
DBG(" %s", buffer_names[i]);
}
DBG("\n");
}
}
/**
* Returns true if the scissor is a noop (cuts out nothing).
*/
static bool
noop_scissor(struct gl_context *ctx, struct gl_framebuffer *fb)
{
return ctx->Scissor.X <= 0 &&
ctx->Scissor.Y <= 0 &&
ctx->Scissor.Width >= fb->Width &&
ctx->Scissor.Height >= fb->Height;
}
/**
* Implements fast depth clears on gen6+.
*
* Fast clears basically work by setting a flag in each of the subspans
* represented in the HiZ buffer that says "When you need the depth values for
* this subspan, it's the hardware's current clear value." Then later rendering
* can just use the static clear value instead of referencing memory.
*
* The tricky part of the implementation is that you have to have the clear
* value that was used on the depth buffer in place for all further rendering,
* at least until a resolve to the real depth buffer happens.
*/
static bool
brw_fast_clear_depth(struct gl_context *ctx)
{
struct brw_context *brw = brw_context(ctx);
struct gl_framebuffer *fb = ctx->DrawBuffer;
struct intel_renderbuffer *depth_irb =
intel_get_renderbuffer(fb, BUFFER_DEPTH);
struct intel_mipmap_tree *mt = depth_irb->mt;
if (brw->gen < 6)
return false;
if (!intel_renderbuffer_has_hiz(depth_irb))
return false;
/* We only handle full buffer clears -- otherwise you'd have to track whether
* a previous clear had happened at a different clear value and resolve it
* first.
*/
if (ctx->Scissor.Enabled && !noop_scissor(ctx, fb)) {
perf_debug("Failed to fast clear depth due to scissor being enabled. "
"Possible 5%% performance win if avoided.\n");
return false;
}
uint32_t depth_clear_value;
switch (mt->format) {
case MESA_FORMAT_Z32_FLOAT_X24S8:
case MESA_FORMAT_S8_Z24:
/* From the Sandy Bridge PRM, volume 2 part 1, page 314:
*
* "[DevSNB+]: Several cases exist where Depth Buffer Clear cannot be
* enabled (the legacy method of clearing must be performed):
*
* - If the depth buffer format is D32_FLOAT_S8X24_UINT or
* D24_UNORM_S8_UINT.
*/
return false;
case MESA_FORMAT_Z32_FLOAT:
depth_clear_value = float_as_int(ctx->Depth.Clear);
break;
case MESA_FORMAT_Z16:
/* From the Sandy Bridge PRM, volume 2 part 1, page 314:
*
* "[DevSNB+]: Several cases exist where Depth Buffer Clear cannot be
* enabled (the legacy method of clearing must be performed):
*
* - DevSNB{W/A}]: When depth buffer format is D16_UNORM and the
* width of the map (LOD0) is not multiple of 16, fast clear
* optimization must be disabled.
*/
if (brw->gen == 6 && (mt->level[depth_irb->mt_level].width % 16) != 0)
return false;
/* FALLTHROUGH */
default:
depth_clear_value = fb->_DepthMax * ctx->Depth.Clear;
break;
}
/* If we're clearing to a new clear value, then we need to resolve any clear
* flags out of the HiZ buffer into the real depth buffer.
*/
if (mt->depth_clear_value != depth_clear_value) {
intel_miptree_all_slices_resolve_depth(brw, mt);
mt->depth_clear_value = depth_clear_value;
}
/* From the Sandy Bridge PRM, volume 2 part 1, page 313:
*
* "If other rendering operations have preceded this clear, a
* PIPE_CONTROL with write cache flush enabled and Z-inhibit disabled
* must be issued before the rectangle primitive used for the depth
* buffer clear operation.
*/
intel_batchbuffer_emit_mi_flush(brw);
intel_hiz_exec(brw, mt, depth_irb->mt_level, depth_irb->mt_layer,
GEN6_HIZ_OP_DEPTH_CLEAR);
if (brw->gen == 6) {
/* From the Sandy Bridge PRM, volume 2 part 1, page 314:
*
* "DevSNB, DevSNB-B{W/A}]: Depth buffer clear pass must be followed
* by a PIPE_CONTROL command with DEPTH_STALL bit set and Then
* followed by Depth FLUSH'
*/
intel_batchbuffer_emit_mi_flush(brw);
}
/* Now, the HiZ buffer contains data that needs to be resolved to the depth
* buffer.
*/
intel_renderbuffer_set_needs_depth_resolve(depth_irb);
return true;
}
/**
* Called by ctx->Driver.Clear.
*/
static void
brw_clear(struct gl_context *ctx, GLbitfield mask)
{
struct brw_context *brw = brw_context(ctx);
struct gl_framebuffer *fb = ctx->DrawBuffer;
bool partial_clear = ctx->Scissor.Enabled && !noop_scissor(ctx, fb);
if (!_mesa_check_conditional_render(ctx))
return;
if (mask & (BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_FRONT_RIGHT)) {
brw->front_buffer_dirty = true;
}
intel_prepare_render(brw);
brw_workaround_depthstencil_alignment(brw, partial_clear ? 0 : mask);
if (mask & BUFFER_BIT_DEPTH) {
if (brw_fast_clear_depth(ctx)) {
DBG("fast clear: depth\n");
mask &= ~BUFFER_BIT_DEPTH;
}
}
/* BLORP is currently only supported on Gen6+. */
if (brw->gen >= 6) {
if (mask & BUFFER_BITS_COLOR) {
if (brw_blorp_clear_color(brw, fb, partial_clear)) {
debug_mask("blorp color", mask & BUFFER_BITS_COLOR);
mask &= ~BUFFER_BITS_COLOR;
}
}
}
GLbitfield tri_mask = mask & (BUFFER_BITS_COLOR |
BUFFER_BIT_STENCIL |
BUFFER_BIT_DEPTH);
if (tri_mask) {
debug_mask("tri", tri_mask);
mask &= ~tri_mask;
if (ctx->API == API_OPENGLES) {
_mesa_meta_Clear(&brw->ctx, tri_mask);
} else {
_mesa_meta_glsl_Clear(&brw->ctx, tri_mask);
}
}
/* Any strange buffers get passed off to swrast */
if (mask) {
debug_mask("swrast", mask);
_swrast_Clear(ctx, mask);
}
}
void
intelInitClearFuncs(struct dd_function_table *functions)
{
functions->Clear = brw_clear;
}