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/*
* 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->ver == 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->ver == 9 && (format == ISL_FORMAT_ASTC_LDR_2D_5X5_FLT16 ||
format == ISL_FORMAT_ASTC_LDR_2D_5X5_U8SRGB))
return false;
return supported;
}
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