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Member "mesa-20.1.8/src/gallium/drivers/iris/iris_formats.c" (16 Sep 2020, 8853 Bytes) of package /linux/misc/mesa-20.1.8.tar.xz:


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    1 /*
    2  * Copyright © 2017 Intel Corporation
    3  *
    4  * Permission is hereby granted, free of charge, to any person obtaining a
    5  * copy of this software and associated documentation files (the "Software"),
    6  * to deal in the Software without restriction, including without limitation
    7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
    8  * and/or sell copies of the Software, and to permit persons to whom the
    9  * Software is furnished to do so, subject to the following conditions:
   10  *
   11  * The above copyright notice and this permission notice shall be included
   12  * in all copies or substantial portions of the Software.
   13  *
   14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   15  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   17  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   19  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   20  * DEALINGS IN THE SOFTWARE.
   21  */
   22 
   23 /**
   24  * @file iris_formats.c
   25  *
   26  * Converts Gallium formats (PIPE_FORMAT_*) to hardware ones (ISL_FORMAT_*).
   27  * Provides information about which formats support what features.
   28  */
   29 
   30 #include "util/bitscan.h"
   31 #include "util/macros.h"
   32 #include "util/format/u_format.h"
   33 
   34 #include "iris_resource.h"
   35 #include "iris_screen.h"
   36 
   37 struct iris_format_info
   38 iris_format_for_usage(const struct gen_device_info *devinfo,
   39                       enum pipe_format pformat,
   40                       isl_surf_usage_flags_t usage)
   41 {
   42    enum isl_format format = isl_format_for_pipe_format(pformat);
   43    struct isl_swizzle swizzle = ISL_SWIZZLE_IDENTITY;
   44 
   45    if (format == ISL_FORMAT_UNSUPPORTED)
   46       return (struct iris_format_info) { .fmt = format, .swizzle = swizzle };
   47 
   48    const struct isl_format_layout *fmtl = isl_format_get_layout(format);
   49 
   50    if (!util_format_is_srgb(pformat)) {
   51       if (util_format_is_intensity(pformat)) {
   52          swizzle = ISL_SWIZZLE(RED, RED, RED, RED);
   53       } else if (util_format_is_luminance(pformat)) {
   54          swizzle = ISL_SWIZZLE(RED, RED, RED, ONE);
   55       } else if (util_format_is_luminance_alpha(pformat)) {
   56          swizzle = ISL_SWIZZLE(RED, RED, RED, GREEN);
   57       } else if (util_format_is_alpha(pformat)) {
   58          swizzle = ISL_SWIZZLE(ZERO, ZERO, ZERO, RED);
   59       }
   60    }
   61 
   62    /* When faking RGBX pipe formats with RGBA ISL formats, override alpha. */
   63    if (!util_format_has_alpha(pformat) && fmtl->channels.a.type != ISL_VOID) {
   64       swizzle = ISL_SWIZZLE(RED, GREEN, BLUE, ONE);
   65    }
   66 
   67    if ((usage & ISL_SURF_USAGE_RENDER_TARGET_BIT) &&
   68        pformat == PIPE_FORMAT_A8_UNORM) {
   69       /* Most of the hardware A/LA formats are not renderable, except
   70        * for A8_UNORM.  SURFACE_STATE's shader channel select fields
   71        * cannot be used to swap RGB and A channels when rendering (as
   72        * it could impact alpha blending), so we have to use the actual
   73        * A8_UNORM format when rendering.
   74        */
   75       format = ISL_FORMAT_A8_UNORM;
   76       swizzle = ISL_SWIZZLE_IDENTITY;
   77    }
   78 
   79    /* We choose RGBA over RGBX for rendering the hardware doesn't support
   80     * rendering to RGBX. However, when this internal override is used on Gen9+,
   81     * fast clears don't work correctly.
   82     *
   83     * i965 fixes this by pretending to not support RGBX formats, and the higher
   84     * layers of Mesa pick the RGBA format instead. Gallium doesn't work that
   85     * way, and might choose a different format, like BGRX instead of RGBX,
   86     * which will also cause problems when sampling from a surface fast cleared
   87     * as RGBX. So we always choose RGBA instead of RGBX explicitly
   88     * here.
   89     */
   90    if (isl_format_is_rgbx(format) &&
   91        !isl_format_supports_rendering(devinfo, format)) {
   92       format = isl_format_rgbx_to_rgba(format);
   93       swizzle = ISL_SWIZZLE(RED, GREEN, BLUE, ONE);
   94    }
   95 
   96    return (struct iris_format_info) { .fmt = format, .swizzle = swizzle };
   97 }
   98 
   99 /**
  100  * The pscreen->is_format_supported() driver hook.
  101  *
  102  * Returns true if the given format is supported for the given usage
  103  * (PIPE_BIND_*) and sample count.
  104  */
  105 bool
  106 iris_is_format_supported(struct pipe_screen *pscreen,
  107                          enum pipe_format pformat,
  108                          enum pipe_texture_target target,
  109                          unsigned sample_count,
  110                          unsigned storage_sample_count,
  111                          unsigned usage)
  112 {
  113    struct iris_screen *screen = (struct iris_screen *) pscreen;
  114    const struct gen_device_info *devinfo = &screen->devinfo;
  115    uint32_t max_samples = devinfo->gen == 8 ? 8 : 16;
  116 
  117    if (sample_count > max_samples ||
  118        !util_is_power_of_two_or_zero(sample_count))
  119       return false;
  120 
  121    if (pformat == PIPE_FORMAT_NONE)
  122       return true;
  123 
  124    enum isl_format format = isl_format_for_pipe_format(pformat);
  125 
  126    if (format == ISL_FORMAT_UNSUPPORTED)
  127       return false;
  128 
  129    const struct isl_format_layout *fmtl = isl_format_get_layout(format);
  130    const bool is_integer = isl_format_has_int_channel(format);
  131    bool supported = true;
  132 
  133    if (sample_count > 1)
  134       supported &= isl_format_supports_multisampling(devinfo, format);
  135 
  136    if (usage & PIPE_BIND_DEPTH_STENCIL) {
  137       supported &= format == ISL_FORMAT_R32_FLOAT_X8X24_TYPELESS ||
  138                    format == ISL_FORMAT_R32_FLOAT ||
  139                    format == ISL_FORMAT_R24_UNORM_X8_TYPELESS ||
  140                    format == ISL_FORMAT_R16_UNORM ||
  141                    format == ISL_FORMAT_R8_UINT;
  142    }
  143 
  144    if (usage & PIPE_BIND_RENDER_TARGET) {
  145       /* Alpha and luminance-alpha formats other than A8_UNORM are not
  146        * renderable.  For texturing, we can use R or RG formats with
  147        * shader channel selects (SCS) to swizzle the data into the correct
  148        * channels.  But for render targets, the hardware prohibits using
  149        * SCS to move shader outputs between the RGB and A channels, as it
  150        * would alter what data is used for alpha blending.
  151        *
  152        * For BLORP, we can apply the swizzle in the shader.  But for
  153        * general rendering, this would mean recompiling the shader, which
  154        * we'd like to avoid doing.  So we mark these formats non-renderable.
  155        *
  156        * We do support A8_UNORM as it's required and is renderable.
  157        */
  158       if (pformat != PIPE_FORMAT_A8_UNORM &&
  159           (util_format_is_alpha(pformat) ||
  160            util_format_is_luminance_alpha(pformat)))
  161          supported = false;
  162 
  163       enum isl_format rt_format = format;
  164 
  165       if (isl_format_is_rgbx(format) &&
  166           !isl_format_supports_rendering(devinfo, format))
  167          rt_format = isl_format_rgbx_to_rgba(format);
  168 
  169       supported &= isl_format_supports_rendering(devinfo, rt_format);
  170 
  171       if (!is_integer)
  172          supported &= isl_format_supports_alpha_blending(devinfo, rt_format);
  173    }
  174 
  175    if (usage & PIPE_BIND_SHADER_IMAGE) {
  176       /* Dataport doesn't support compression, and we can't resolve an MCS
  177        * compressed surface.  (Buffer images may have sample count of 0.)
  178        */
  179       supported &= sample_count == 0;
  180 
  181       supported &= isl_format_supports_typed_writes(devinfo, format);
  182       supported &= isl_has_matching_typed_storage_image_format(devinfo, format);
  183    }
  184 
  185    if (usage & PIPE_BIND_SAMPLER_VIEW) {
  186       supported &= isl_format_supports_sampling(devinfo, format);
  187       if (!is_integer)
  188          supported &= isl_format_supports_filtering(devinfo, format);
  189 
  190       /* Don't advertise 3-component RGB formats for non-buffer textures.
  191        * This ensures that they are renderable from an API perspective since
  192        * the state tracker will fall back to RGBA or RGBX, which are
  193        * renderable.  We want to render internally for copies and blits,
  194        * even if the application doesn't.
  195        *
  196        * Buffer textures don't need to be renderable, so we support real RGB.
  197        * This is useful for PBO upload, and 32-bit RGB support is mandatory.
  198        */
  199       if (target != PIPE_BUFFER)
  200          supported &= fmtl->bpb != 24 && fmtl->bpb != 48 && fmtl->bpb != 96;
  201    }
  202 
  203    if (usage & PIPE_BIND_VERTEX_BUFFER)
  204       supported &= isl_format_supports_vertex_fetch(devinfo, format);
  205 
  206    if (usage & PIPE_BIND_INDEX_BUFFER) {
  207       supported &= format == ISL_FORMAT_R8_UINT ||
  208                    format == ISL_FORMAT_R16_UINT ||
  209                    format == ISL_FORMAT_R32_UINT;
  210    }
  211 
  212    /* TODO: Support ASTC 5x5 on Gen9 properly.  This means implementing
  213     * a complex sampler workaround (see i965's gen9_apply_astc5x5_wa_flush).
  214     * Without it, st/mesa will emulate ASTC 5x5 via uncompressed textures.
  215     */
  216    if (devinfo->gen == 9 && (format == ISL_FORMAT_ASTC_LDR_2D_5X5_FLT16 ||
  217                              format == ISL_FORMAT_ASTC_LDR_2D_5X5_U8SRGB))
  218       return false;
  219 
  220    return supported;
  221 }
  222