mirror of https://gitlab.freedesktop.org/mesa/mesa
68 lines
2.2 KiB
C
68 lines
2.2 KiB
C
/*
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* Copyright (C) 2019 Collabora, Ltd.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <stdio.h>
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#include "pan_texture.h"
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/* Translate a PIPE swizzle quad to a 12-bit Mali swizzle code. PIPE
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* swizzles line up with Mali swizzles for the XYZW01, but PIPE swizzles have
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* an additional "NONE" field that we have to mask out to zero. Additionally,
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* PIPE swizzles are sparse but Mali swizzles are packed */
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unsigned
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panfrost_translate_swizzle_4(const unsigned char swizzle[4])
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{
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unsigned out = 0;
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for (unsigned i = 0; i < 4; ++i) {
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assert(swizzle[i] <= PIPE_SWIZZLE_1);
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out |= (swizzle[i] << (3 * i));
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}
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return out;
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}
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void
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panfrost_invert_swizzle(const unsigned char *in, unsigned char *out)
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{
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/* First, default to all zeroes to prevent uninitialized junk */
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for (unsigned c = 0; c < 4; ++c)
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out[c] = PIPE_SWIZZLE_0;
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/* Now "do" what the swizzle says */
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for (unsigned c = 0; c < 4; ++c) {
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unsigned char i = in[c];
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/* Who cares? */
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assert(PIPE_SWIZZLE_X == 0);
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if (i > PIPE_SWIZZLE_W)
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continue;
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/* Invert */
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unsigned idx = i - PIPE_SWIZZLE_X;
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out[idx] = PIPE_SWIZZLE_X + c;
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}
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}
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