| /* |
| * Copyright © 2017 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 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. |
| */ |
| |
| /** |
| * @file iris_formats.c |
| * |
| * Converts Gallium formats (PIPE_FORMAT_*) to hardware ones (ISL_FORMAT_*). |
| * Provides information about which formats support what features. |
| */ |
| |
| #include "util/bitscan.h" |
| #include "util/macros.h" |
| #include "util/format/u_format.h" |
| |
| #include "iris_resource.h" |
| #include "iris_screen.h" |
| |
| struct iris_format_info |
| iris_format_for_usage(const struct gen_device_info *devinfo, |
| enum pipe_format pformat, |
| isl_surf_usage_flags_t usage) |
| { |
| enum isl_format format = isl_format_for_pipe_format(pformat); |
| struct isl_swizzle swizzle = ISL_SWIZZLE_IDENTITY; |
| |
| if (format == ISL_FORMAT_UNSUPPORTED) |
| return (struct iris_format_info) { .fmt = format, .swizzle = swizzle }; |
| |
| const struct isl_format_layout *fmtl = isl_format_get_layout(format); |
| |
| if (!util_format_is_srgb(pformat)) { |
| if (util_format_is_intensity(pformat)) { |
| swizzle = ISL_SWIZZLE(RED, RED, RED, RED); |
| } else if (util_format_is_luminance(pformat)) { |
| swizzle = ISL_SWIZZLE(RED, RED, RED, ONE); |
| } else if (util_format_is_luminance_alpha(pformat)) { |
| swizzle = ISL_SWIZZLE(RED, RED, RED, GREEN); |
| } else if (util_format_is_alpha(pformat)) { |
| swizzle = ISL_SWIZZLE(ZERO, ZERO, ZERO, RED); |
| } |
| } |
| |
| /* When faking RGBX pipe formats with RGBA ISL formats, override alpha. */ |
| if (!util_format_has_alpha(pformat) && fmtl->channels.a.type != ISL_VOID) { |
| swizzle = ISL_SWIZZLE(RED, GREEN, BLUE, ONE); |
| } |
| |
| if ((usage & ISL_SURF_USAGE_RENDER_TARGET_BIT) && |
| pformat == PIPE_FORMAT_A8_UNORM) { |
| /* Most of the hardware A/LA formats are not renderable, except |
| * for A8_UNORM. SURFACE_STATE's shader channel select fields |
| * cannot be used to swap RGB and A channels when rendering (as |
| * it could impact alpha blending), so we have to use the actual |
| * A8_UNORM format when rendering. |
| */ |
| format = ISL_FORMAT_A8_UNORM; |
| swizzle = ISL_SWIZZLE_IDENTITY; |
| } |
| |
| /* We choose RGBA over RGBX for rendering the hardware doesn't support |
| * rendering to RGBX. However, when this internal override is used on Gen9+, |
| * fast clears don't work correctly. |
| * |
| * i965 fixes this by pretending to not support RGBX formats, and the higher |
| * layers of Mesa pick the RGBA format instead. Gallium doesn't work that |
| * way, and might choose a different format, like BGRX instead of RGBX, |
| * which will also cause problems when sampling from a surface fast cleared |
| * as RGBX. So we always choose RGBA instead of RGBX explicitly |
| * here. |
| */ |
| if (isl_format_is_rgbx(format) && |
| !isl_format_supports_rendering(devinfo, format)) { |
| format = isl_format_rgbx_to_rgba(format); |
| swizzle = ISL_SWIZZLE(RED, GREEN, BLUE, ONE); |
| } |
| |
| return (struct iris_format_info) { .fmt = format, .swizzle = swizzle }; |
| } |
| |
| /** |
| * The pscreen->is_format_supported() driver hook. |
| * |
| * Returns true if the given format is supported for the given usage |
| * (PIPE_BIND_*) and sample count. |
| */ |
| bool |
| iris_is_format_supported(struct pipe_screen *pscreen, |
| enum pipe_format pformat, |
| enum pipe_texture_target target, |
| unsigned sample_count, |
| unsigned storage_sample_count, |
| unsigned usage) |
| { |
| struct iris_screen *screen = (struct iris_screen *) pscreen; |
| const struct gen_device_info *devinfo = &screen->devinfo; |
| uint32_t max_samples = devinfo->gen == 8 ? 8 : 16; |
| |
| if (sample_count > max_samples || |
| !util_is_power_of_two_or_zero(sample_count)) |
| return false; |
| |
| if (pformat == PIPE_FORMAT_NONE) |
| return true; |
| |
| enum isl_format format = isl_format_for_pipe_format(pformat); |
| |
| if (format == ISL_FORMAT_UNSUPPORTED) |
| return false; |
| |
| const struct isl_format_layout *fmtl = isl_format_get_layout(format); |
| const bool is_integer = isl_format_has_int_channel(format); |
| bool supported = true; |
| |
| if (sample_count > 1) |
| supported &= isl_format_supports_multisampling(devinfo, format); |
| |
| if (usage & PIPE_BIND_DEPTH_STENCIL) { |
| supported &= format == ISL_FORMAT_R32_FLOAT_X8X24_TYPELESS || |
| format == ISL_FORMAT_R32_FLOAT || |
| format == ISL_FORMAT_R24_UNORM_X8_TYPELESS || |
| format == ISL_FORMAT_R16_UNORM || |
| format == ISL_FORMAT_R8_UINT; |
| } |
| |
| if (usage & PIPE_BIND_RENDER_TARGET) { |
| /* Alpha and luminance-alpha formats other than A8_UNORM are not |
| * renderable. For texturing, we can use R or RG formats with |
| * shader channel selects (SCS) to swizzle the data into the correct |
| * channels. But for render targets, the hardware prohibits using |
| * SCS to move shader outputs between the RGB and A channels, as it |
| * would alter what data is used for alpha blending. |
| * |
| * For BLORP, we can apply the swizzle in the shader. But for |
| * general rendering, this would mean recompiling the shader, which |
| * we'd like to avoid doing. So we mark these formats non-renderable. |
| * |
| * We do support A8_UNORM as it's required and is renderable. |
| */ |
| if (pformat != PIPE_FORMAT_A8_UNORM && |
| (util_format_is_alpha(pformat) || |
| util_format_is_luminance_alpha(pformat))) |
| supported = false; |
| |
| enum isl_format rt_format = format; |
| |
| if (isl_format_is_rgbx(format) && |
| !isl_format_supports_rendering(devinfo, format)) |
| rt_format = isl_format_rgbx_to_rgba(format); |
| |
| supported &= isl_format_supports_rendering(devinfo, rt_format); |
| |
| if (!is_integer) |
| supported &= isl_format_supports_alpha_blending(devinfo, rt_format); |
| } |
| |
| if (usage & PIPE_BIND_SHADER_IMAGE) { |
| /* Dataport doesn't support compression, and we can't resolve an MCS |
| * compressed surface. (Buffer images may have sample count of 0.) |
| */ |
| supported &= sample_count == 0; |
| |
| supported &= isl_format_supports_typed_writes(devinfo, format); |
| supported &= isl_has_matching_typed_storage_image_format(devinfo, format); |
| } |
| |
| if (usage & PIPE_BIND_SAMPLER_VIEW) { |
| supported &= isl_format_supports_sampling(devinfo, format); |
| if (!is_integer) |
| supported &= isl_format_supports_filtering(devinfo, format); |
| |
| /* Don't advertise 3-component RGB formats for non-buffer textures. |
| * This ensures that they are renderable from an API perspective since |
| * gallium frontends will fall back to RGBA or RGBX, which are |
| * renderable. We want to render internally for copies and blits, |
| * even if the application doesn't. |
| * |
| * Buffer textures don't need to be renderable, so we support real RGB. |
| * This is useful for PBO upload, and 32-bit RGB support is mandatory. |
| */ |
| if (target != PIPE_BUFFER) |
| supported &= fmtl->bpb != 24 && fmtl->bpb != 48 && fmtl->bpb != 96; |
| } |
| |
| if (usage & PIPE_BIND_VERTEX_BUFFER) |
| supported &= isl_format_supports_vertex_fetch(devinfo, format); |
| |
| if (usage & PIPE_BIND_INDEX_BUFFER) { |
| supported &= format == ISL_FORMAT_R8_UINT || |
| format == ISL_FORMAT_R16_UINT || |
| format == ISL_FORMAT_R32_UINT; |
| } |
| |
| /* TODO: Support ASTC 5x5 on Gen9 properly. This means implementing |
| * a complex sampler workaround (see i965's gen9_apply_astc5x5_wa_flush). |
| * Without it, st/mesa will emulate ASTC 5x5 via uncompressed textures. |
| */ |
| if (devinfo->gen == 9 && (format == ISL_FORMAT_ASTC_LDR_2D_5X5_FLT16 || |
| format == ISL_FORMAT_ASTC_LDR_2D_5X5_U8SRGB)) |
| return false; |
| |
| return supported; |
| } |
| |
