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      1 /*
      2  * Copyright (C) 2019 Collabora, Ltd.
      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 (including the next
     12  * paragraph) shall be included in all copies or substantial portions of the
     13  * Software.
     14  *
     15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     21  * SOFTWARE.
     22  */
     23 
     24 #include <stdio.h>
     25 #include "pan_texture.h"
     26 #include "panfrost-quirks.h"
     27 
     28 /* Translate a PIPE swizzle quad to a 12-bit Mali swizzle code. PIPE
     29  * swizzles line up with Mali swizzles for the XYZW01, but PIPE swizzles have
     30  * an additional "NONE" field that we have to mask out to zero. Additionally,
     31  * PIPE swizzles are sparse but Mali swizzles are packed */
     32 
     33 unsigned
     34 panfrost_translate_swizzle_4(const unsigned char swizzle[4])
     35 {
     36         unsigned out = 0;
     37 
     38         for (unsigned i = 0; i < 4; ++i) {
     39                 unsigned translated = (swizzle[i] > PIPE_SWIZZLE_1) ? PIPE_SWIZZLE_0 : swizzle[i];
     40                 out |= (translated << (3*i));
     41         }
     42 
     43         return out;
     44 }
     45 
     46 void
     47 panfrost_invert_swizzle(const unsigned char *in, unsigned char *out)
     48 {
     49         /* First, default to all zeroes to prevent uninitialized junk */
     50 
     51         for (unsigned c = 0; c < 4; ++c)
     52                 out[c] = PIPE_SWIZZLE_0;
     53 
     54         /* Now "do" what the swizzle says */
     55 
     56         for (unsigned c = 0; c < 4; ++c) {
     57                 unsigned char i = in[c];
     58 
     59                 /* Who cares? */
     60                 assert(PIPE_SWIZZLE_X == 0);
     61                 if (i > PIPE_SWIZZLE_W)
     62                         continue;
     63 
     64                 /* Invert */
     65                 unsigned idx = i - PIPE_SWIZZLE_X;
     66                 out[idx] = PIPE_SWIZZLE_X + c;
     67         }
     68 }
     69 
     70 /* Formats requiring blend shaders are stored raw in the tilebuffer and will
     71  * have 0 as their pixel format. Assumes dithering is set, I don't know of a
     72  * case when it makes sense to turn off dithering. */
     73 
     74 unsigned
     75 panfrost_format_to_bifrost_blend(const struct panfrost_device *dev,
     76                                  enum pipe_format format,
     77                                  bool dithered)
     78 {
     79         mali_pixel_format pixfmt = (dev->arch >= 7) ?
     80                 panfrost_blendable_formats_v7[format].bifrost[dithered] :
     81                 panfrost_blendable_formats_v6[format].bifrost[dithered];
     82 
     83         return pixfmt ?: dev->formats[format].hw;
     84 }
     85