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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
iris_format_for_usage(const struct intel_device_info * devinfo,enum pipe_format pformat,isl_surf_usage_flags_t usage)38 iris_format_for_usage(const struct intel_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 Gfx9+,
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
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)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 intel_device_info *devinfo = &screen->devinfo;
115    uint32_t max_samples = devinfo->ver == 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    /* Rely on gallium fallbacks for better YUV format support. */
125    if (util_format_is_yuv(pformat))
126       return false;
127 
128    enum isl_format format = isl_format_for_pipe_format(pformat);
129 
130    if (format == ISL_FORMAT_UNSUPPORTED)
131       return false;
132 
133    const struct isl_format_layout *fmtl = isl_format_get_layout(format);
134    const bool is_integer = isl_format_has_int_channel(format);
135    bool supported = true;
136 
137    if (sample_count > 1)
138       supported &= isl_format_supports_multisampling(devinfo, format);
139 
140    if (usage & PIPE_BIND_DEPTH_STENCIL) {
141       supported &= format == ISL_FORMAT_R32_FLOAT_X8X24_TYPELESS ||
142                    format == ISL_FORMAT_R32_FLOAT ||
143                    format == ISL_FORMAT_R24_UNORM_X8_TYPELESS ||
144                    format == ISL_FORMAT_R16_UNORM ||
145                    format == ISL_FORMAT_R8_UINT;
146    }
147 
148    if (usage & PIPE_BIND_RENDER_TARGET) {
149       /* Alpha and luminance-alpha formats other than A8_UNORM are not
150        * renderable.  For texturing, we can use R or RG formats with
151        * shader channel selects (SCS) to swizzle the data into the correct
152        * channels.  But for render targets, the hardware prohibits using
153        * SCS to move shader outputs between the RGB and A channels, as it
154        * would alter what data is used for alpha blending.
155        *
156        * For BLORP, we can apply the swizzle in the shader.  But for
157        * general rendering, this would mean recompiling the shader, which
158        * we'd like to avoid doing.  So we mark these formats non-renderable.
159        *
160        * We do support A8_UNORM as it's required and is renderable.
161        */
162       if (pformat != PIPE_FORMAT_A8_UNORM &&
163           (util_format_is_alpha(pformat) ||
164            util_format_is_luminance_alpha(pformat)))
165          supported = false;
166 
167       enum isl_format rt_format = format;
168 
169       if (isl_format_is_rgbx(format) &&
170           !isl_format_supports_rendering(devinfo, format))
171          rt_format = isl_format_rgbx_to_rgba(format);
172 
173       supported &= isl_format_supports_rendering(devinfo, rt_format);
174 
175       if (!is_integer)
176          supported &= isl_format_supports_alpha_blending(devinfo, rt_format);
177    }
178 
179    if (usage & PIPE_BIND_SHADER_IMAGE) {
180       /* Dataport doesn't support compression, and we can't resolve an MCS
181        * compressed surface.  (Buffer images may have sample count of 0.)
182        */
183       supported &= sample_count == 0;
184 
185       supported &= isl_format_supports_typed_writes(devinfo, format);
186       supported &= isl_has_matching_typed_storage_image_format(devinfo, format);
187    }
188 
189    if (usage & PIPE_BIND_SAMPLER_VIEW) {
190       supported &= isl_format_supports_sampling(devinfo, format);
191       if (!is_integer)
192          supported &= isl_format_supports_filtering(devinfo, format);
193 
194       /* Don't advertise 3-component RGB formats for non-buffer textures.
195        * This ensures that they are renderable from an API perspective since
196        * gallium frontends will fall back to RGBA or RGBX, which are
197        * renderable.  We want to render internally for copies and blits,
198        * even if the application doesn't.
199        *
200        * Buffer textures don't need to be renderable, so we support real RGB.
201        * This is useful for PBO upload, and 32-bit RGB support is mandatory.
202        */
203       if (target != PIPE_BUFFER)
204          supported &= fmtl->bpb != 24 && fmtl->bpb != 48 && fmtl->bpb != 96;
205    }
206 
207    if (usage & PIPE_BIND_VERTEX_BUFFER)
208       supported &= isl_format_supports_vertex_fetch(devinfo, format);
209 
210    if (usage & PIPE_BIND_INDEX_BUFFER) {
211       supported &= format == ISL_FORMAT_R8_UINT ||
212                    format == ISL_FORMAT_R16_UINT ||
213                    format == ISL_FORMAT_R32_UINT;
214    }
215 
216    /* TODO: Support ASTC 5x5 on Gfx9 properly.  This means implementing
217     * a complex sampler workaround (see i965's gfx9_apply_astc5x5_wa_flush).
218     * Without it, st/mesa will emulate ASTC 5x5 via uncompressed textures.
219     */
220    if (devinfo->ver == 9 && (format == ISL_FORMAT_ASTC_LDR_2D_5X5_FLT16 ||
221                              format == ISL_FORMAT_ASTC_LDR_2D_5X5_U8SRGB))
222       return false;
223 
224    return supported;
225 }
226 
227