1 /**************************************************************************
3 * Copyright 2003 VMware, Inc.
4 * Copyright 2009, 2012 Intel Corporation.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sub license, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
22 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
23 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
24 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
25 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27 **************************************************************************/
29 #include "main/glheader.h"
30 #include "main/mtypes.h"
31 #include "main/condrender.h"
32 #include "swrast/swrast.h"
33 #include "drivers/common/meta.h"
35 #include "intel_batchbuffer.h"
36 #include "intel_blit.h"
37 #include "intel_fbo.h"
38 #include "intel_mipmap_tree.h"
40 #include "brw_context.h"
41 #include "brw_blorp.h"
43 #define FILE_DEBUG_FLAG DEBUG_BLIT
45 static const char *buffer_names
[] = {
46 [BUFFER_FRONT_LEFT
] = "front",
47 [BUFFER_BACK_LEFT
] = "back",
48 [BUFFER_FRONT_RIGHT
] = "front right",
49 [BUFFER_BACK_RIGHT
] = "back right",
50 [BUFFER_DEPTH
] = "depth",
51 [BUFFER_STENCIL
] = "stencil",
52 [BUFFER_ACCUM
] = "accum",
53 [BUFFER_AUX0
] = "aux0",
54 [BUFFER_COLOR0
] = "color0",
55 [BUFFER_COLOR1
] = "color1",
56 [BUFFER_COLOR2
] = "color2",
57 [BUFFER_COLOR3
] = "color3",
58 [BUFFER_COLOR4
] = "color4",
59 [BUFFER_COLOR5
] = "color5",
60 [BUFFER_COLOR6
] = "color6",
61 [BUFFER_COLOR7
] = "color7",
65 debug_mask(const char *name
, GLbitfield mask
)
69 if (unlikely(INTEL_DEBUG
& DEBUG_BLIT
)) {
70 DBG("%s clear:", name
);
71 for (i
= 0; i
< BUFFER_COUNT
; i
++) {
73 DBG(" %s", buffer_names
[i
]);
80 * Returns true if the scissor is a noop (cuts out nothing).
83 noop_scissor(struct gl_context
*ctx
, struct gl_framebuffer
*fb
)
85 return ctx
->Scissor
.ScissorArray
[0].X
<= 0 &&
86 ctx
->Scissor
.ScissorArray
[0].Y
<= 0 &&
87 ctx
->Scissor
.ScissorArray
[0].Width
>= fb
->Width
&&
88 ctx
->Scissor
.ScissorArray
[0].Height
>= fb
->Height
;
92 * Implements fast depth clears on gen6+.
94 * Fast clears basically work by setting a flag in each of the subspans
95 * represented in the HiZ buffer that says "When you need the depth values for
96 * this subspan, it's the hardware's current clear value." Then later rendering
97 * can just use the static clear value instead of referencing memory.
99 * The tricky part of the implementation is that you have to have the clear
100 * value that was used on the depth buffer in place for all further rendering,
101 * at least until a resolve to the real depth buffer happens.
104 brw_fast_clear_depth(struct gl_context
*ctx
)
106 struct brw_context
*brw
= brw_context(ctx
);
107 struct gl_framebuffer
*fb
= ctx
->DrawBuffer
;
108 struct intel_renderbuffer
*depth_irb
=
109 intel_get_renderbuffer(fb
, BUFFER_DEPTH
);
110 struct intel_mipmap_tree
*mt
= depth_irb
->mt
;
111 struct gl_renderbuffer_attachment
*depth_att
= &fb
->Attachment
[BUFFER_DEPTH
];
116 if (!intel_renderbuffer_has_hiz(depth_irb
))
119 /* We only handle full buffer clears -- otherwise you'd have to track whether
120 * a previous clear had happened at a different clear value and resolve it
123 if ((ctx
->Scissor
.EnableFlags
& 1) && !noop_scissor(ctx
, fb
)) {
124 perf_debug("Failed to fast clear depth due to scissor being enabled. "
125 "Possible 5%% performance win if avoided.\n");
129 uint32_t depth_clear_value
;
130 switch (mt
->format
) {
131 case MESA_FORMAT_Z32_FLOAT_S8X24_UINT
:
132 case MESA_FORMAT_Z24_UNORM_S8_UINT
:
133 /* From the Sandy Bridge PRM, volume 2 part 1, page 314:
135 * "[DevSNB+]: Several cases exist where Depth Buffer Clear cannot be
136 * enabled (the legacy method of clearing must be performed):
138 * - If the depth buffer format is D32_FLOAT_S8X24_UINT or
143 case MESA_FORMAT_Z_FLOAT32
:
144 depth_clear_value
= float_as_int(ctx
->Depth
.Clear
);
147 case MESA_FORMAT_Z_UNORM16
:
148 /* From the Sandy Bridge PRM, volume 2 part 1, page 314:
150 * "[DevSNB+]: Several cases exist where Depth Buffer Clear cannot be
151 * enabled (the legacy method of clearing must be performed):
153 * - DevSNB{W/A}]: When depth buffer format is D16_UNORM and the
154 * width of the map (LOD0) is not multiple of 16, fast clear
155 * optimization must be disabled.
158 (minify(mt
->physical_width0
,
159 depth_irb
->mt_level
- mt
->first_level
) % 16) != 0)
165 depth_clear_value
= float_as_int(ctx
->Depth
.Clear
);
167 depth_clear_value
= fb
->_DepthMax
* ctx
->Depth
.Clear
;
171 /* If we're clearing to a new clear value, then we need to resolve any clear
172 * flags out of the HiZ buffer into the real depth buffer.
174 if (mt
->depth_clear_value
!= depth_clear_value
) {
175 intel_miptree_all_slices_resolve_depth(brw
, mt
);
176 mt
->depth_clear_value
= depth_clear_value
;
179 /* From the Sandy Bridge PRM, volume 2 part 1, page 313:
181 * "If other rendering operations have preceded this clear, a
182 * PIPE_CONTROL with write cache flush enabled and Z-inhibit disabled
183 * must be issued before the rectangle primitive used for the depth
184 * buffer clear operation.
186 intel_batchbuffer_emit_mi_flush(brw
);
188 if (fb
->MaxNumLayers
> 0) {
189 for (unsigned layer
= 0; layer
< depth_irb
->layer_count
; layer
++) {
190 intel_hiz_exec(brw
, mt
, depth_irb
->mt_level
,
191 depth_irb
->mt_layer
+ layer
,
192 GEN6_HIZ_OP_DEPTH_CLEAR
);
195 intel_hiz_exec(brw
, mt
, depth_irb
->mt_level
, depth_irb
->mt_layer
,
196 GEN6_HIZ_OP_DEPTH_CLEAR
);
200 /* From the Sandy Bridge PRM, volume 2 part 1, page 314:
202 * "DevSNB, DevSNB-B{W/A}]: Depth buffer clear pass must be followed
203 * by a PIPE_CONTROL command with DEPTH_STALL bit set and Then
204 * followed by Depth FLUSH'
206 intel_batchbuffer_emit_mi_flush(brw
);
209 /* Now, the HiZ buffer contains data that needs to be resolved to the depth
212 intel_renderbuffer_att_set_needs_depth_resolve(depth_att
);
218 * Called by ctx->Driver.Clear.
221 brw_clear(struct gl_context
*ctx
, GLbitfield mask
)
223 struct brw_context
*brw
= brw_context(ctx
);
224 struct gl_framebuffer
*fb
= ctx
->DrawBuffer
;
225 bool partial_clear
= ctx
->Scissor
.EnableFlags
&& !noop_scissor(ctx
, fb
);
227 if (!_mesa_check_conditional_render(ctx
))
230 if (mask
& (BUFFER_BIT_FRONT_LEFT
| BUFFER_BIT_FRONT_RIGHT
)) {
231 brw
->front_buffer_dirty
= true;
234 intel_prepare_render(brw
);
235 brw_workaround_depthstencil_alignment(brw
, partial_clear
? 0 : mask
);
237 if (mask
& BUFFER_BIT_DEPTH
) {
238 if (brw_fast_clear_depth(ctx
)) {
239 DBG("fast clear: depth\n");
240 mask
&= ~BUFFER_BIT_DEPTH
;
244 /* Clear color buffers with fast clear or at least rep16 writes. */
245 if (brw
->gen
>= 6 && brw
->gen
< 9 && (mask
& BUFFER_BITS_COLOR
)) {
246 if (brw_meta_fast_clear(brw
, fb
, mask
, partial_clear
)) {
247 debug_mask("blorp color", mask
& BUFFER_BITS_COLOR
);
248 mask
&= ~BUFFER_BITS_COLOR
;
252 GLbitfield tri_mask
= mask
& (BUFFER_BITS_COLOR
|
257 debug_mask("tri", tri_mask
);
260 if (ctx
->API
== API_OPENGLES
) {
261 _mesa_meta_Clear(&brw
->ctx
, tri_mask
);
263 _mesa_meta_glsl_Clear(&brw
->ctx
, tri_mask
);
267 /* Any strange buffers get passed off to swrast */
269 debug_mask("swrast", mask
);
270 _swrast_Clear(ctx
, mask
);
276 intelInitClearFuncs(struct dd_function_table
*functions
)
278 functions
->Clear
= brw_clear
;