diff options
author | Jason Ekstrand <[email protected]> | 2019-06-19 15:52:55 -0500 |
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committer | Jason Ekstrand <[email protected]> | 2019-06-21 14:18:59 +0000 |
commit | 13f0c278c528167b14badf8172827412526d2160 (patch) | |
tree | 592493d070a1d615832386e4b8fba35e384f545e /src/intel | |
parent | 60c581b57d9ce5f56900cdbd6cd7f02d125f0635 (diff) |
i965,iris: Move guardband calculations to a common location
Reviewed-by: Kenneth Graunke <[email protected]>
Reviewed-by: Lionel Landwerlin <[email protected]>
Diffstat (limited to 'src/intel')
-rw-r--r-- | src/intel/Makefile.sources | 1 | ||||
-rw-r--r-- | src/intel/common/gen_guardband.h | 117 | ||||
-rw-r--r-- | src/intel/common/meson.build | 1 |
3 files changed, 119 insertions, 0 deletions
diff --git a/src/intel/Makefile.sources b/src/intel/Makefile.sources index c1f87e13e4e..7a44b72f449 100644 --- a/src/intel/Makefile.sources +++ b/src/intel/Makefile.sources @@ -16,6 +16,7 @@ COMMON_FILES = \ common/gen_disasm.h \ common/gen_defines.h \ common/gen_gem.h \ + common/gen_guardband.h \ common/gen_l3_config.c \ common/gen_l3_config.h \ common/gen_urb_config.c \ diff --git a/src/intel/common/gen_guardband.h b/src/intel/common/gen_guardband.h new file mode 100644 index 00000000000..757324fd2ee --- /dev/null +++ b/src/intel/common/gen_guardband.h @@ -0,0 +1,117 @@ +/* + * Copyright © 2019 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. + */ +#ifndef GEN_GUARDBAND_H +#define GEN_GUARDBAND_H + +static inline void +gen_calculate_guardband_size(uint32_t fb_width, uint32_t fb_height, + float m00, float m11, float m30, float m31, + float *xmin, float *xmax, + float *ymin, float *ymax) +{ + /* According to the "Vertex X,Y Clamping and Quantization" section of the + * Strips and Fans documentation: + * + * "The vertex X and Y screen-space coordinates are also /clamped/ to the + * fixed-point "guardband" range supported by the rasterization hardware" + * + * and + * + * "In almost all circumstances, if an object’s vertices are actually + * modified by this clamping (i.e., had X or Y coordinates outside of + * the guardband extent the rendered object will not match the intended + * result. Therefore software should take steps to ensure that this does + * not happen - e.g., by clipping objects such that they do not exceed + * these limits after the Drawing Rectangle is applied." + * + * I believe the fundamental restriction is that the rasterizer (in + * the SF/WM stages) have a limit on the number of pixels that can be + * rasterized. We need to ensure any coordinates beyond the rasterizer + * limit are handled by the clipper. So effectively that limit becomes + * the clipper's guardband size. + * + * It goes on to say: + * + * "In addition, in order to be correctly rendered, objects must have a + * screenspace bounding box not exceeding 8K in the X or Y direction. + * This additional restriction must also be comprehended by software, + * i.e., enforced by use of clipping." + * + * This makes no sense. Gen7+ hardware supports 16K render targets, + * and you definitely need to be able to draw polygons that fill the + * surface. Our assumption is that the rasterizer was limited to 8K + * on Sandybridge, which only supports 8K surfaces, and it was actually + * increased to 16K on Ivybridge and later. + * + * So, limit the guardband to 16K on Gen7+ and 8K on Sandybridge. + */ + const float gb_size = GEN_GEN >= 7 ? 16384.0f : 8192.0f; + + /* Workaround: prevent gpu hangs on SandyBridge + * by disabling guardband clipping for odd dimensions. + */ + if (GEN_GEN == 6 && (fb_width & 1 || fb_height & 1)) { + *xmin = -1.0f; + *xmax = 1.0f; + *ymin = -1.0f; + *ymax = 1.0f; + return; + } + + if (m00 != 0 && m11 != 0) { + /* First, we compute the screen-space render area */ + const float ss_ra_xmin = MIN3( 0, m30 + m00, m30 - m00); + const float ss_ra_xmax = MAX3( fb_width, m30 + m00, m30 - m00); + const float ss_ra_ymin = MIN3( 0, m31 + m11, m31 - m11); + const float ss_ra_ymax = MAX3(fb_height, m31 + m11, m31 - m11); + + /* We want the guardband to be centered on that */ + const float ss_gb_xmin = (ss_ra_xmin + ss_ra_xmax) / 2 - gb_size; + const float ss_gb_xmax = (ss_ra_xmin + ss_ra_xmax) / 2 + gb_size; + const float ss_gb_ymin = (ss_ra_ymin + ss_ra_ymax) / 2 - gb_size; + const float ss_gb_ymax = (ss_ra_ymin + ss_ra_ymax) / 2 + gb_size; + + /* Now we need it in native device coordinates */ + const float ndc_gb_xmin = (ss_gb_xmin - m30) / m00; + const float ndc_gb_xmax = (ss_gb_xmax - m30) / m00; + const float ndc_gb_ymin = (ss_gb_ymin - m31) / m11; + const float ndc_gb_ymax = (ss_gb_ymax - m31) / m11; + + /* Thanks to Y-flipping and ORIGIN_UPPER_LEFT, the Y coordinates may be + * flipped upside-down. X should be fine though. + */ + assert(ndc_gb_xmin <= ndc_gb_xmax); + *xmin = ndc_gb_xmin; + *xmax = ndc_gb_xmax; + *ymin = MIN2(ndc_gb_ymin, ndc_gb_ymax); + *ymax = MAX2(ndc_gb_ymin, ndc_gb_ymax); + } else { + /* The viewport scales to 0, so nothing will be rendered. */ + *xmin = 0.0f; + *xmax = 0.0f; + *ymin = 0.0f; + *ymax = 0.0f; + } +} + +#endif /* GEN_GUARDBAND_H */ diff --git a/src/intel/common/meson.build b/src/intel/common/meson.build index bf8d6feab2a..540d78f90b5 100644 --- a/src/intel/common/meson.build +++ b/src/intel/common/meson.build @@ -28,6 +28,7 @@ files_libintel_common = files( 'gen_disasm.c', 'gen_disasm.h', 'gen_gem.h', + 'gen_guardband.h', 'gen_l3_config.c', 'gen_l3_config.h', 'gen_urb_config.c', |