167 lines
6.3 KiB
C
167 lines
6.3 KiB
C
/*
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* Copyright (C) 2019-2021 Collabora, Ltd.
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* Copyright (C) 2019 Alyssa Rosenzweig
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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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*/
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#include "genxml/gen_macros.h"
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#include <string.h>
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#include "pan_util.h"
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#include "pan_format.h"
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#include "gallium/auxiliary/util/u_pack_color.h"
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#include "util/rounding.h"
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#include "util/format_srgb.h"
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/* Clear colours are packed as the internal format of the tilebuffer, looked up
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* in the blendable formats table given the render target format.
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*
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* Raw formats may emulate arbitrary formats with blend shaders. For these, we
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* defer to util_pack_colour to pack in the API format.
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*
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* Blendable formats, on the other hand, include extra "fractional" bits in the
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* tilebuffer for dithering. These have a packed fixed-point representation:
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* for a channel with m integer bits and n fractional bits, multiply by ((2^m)
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* - 1) * 2^n and round to the nearest even.
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*/
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/* Replicate a 32-bit value to fill 128-bit */
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static void
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pan_pack_color_32(uint32_t *packed, uint32_t v)
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{
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for (unsigned i = 0; i < 4; ++i)
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packed[i] = v;
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}
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/* For m integer bits and n fractional bits, calculate the conversion factor,
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* multiply the source value, and convert to integer rounding to even. When
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* dithering, the fractional bits are used. When not dithered, only the integer
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* bits are used and the fractional bits must remain zero. */
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static inline uint32_t
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float_to_fixed(float f, unsigned bits_int, unsigned bits_frac, bool dither)
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{
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uint32_t m = (1 << bits_int) - 1;
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if (dither) {
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float factor = m << bits_frac;
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return _mesa_roundevenf(f * factor);
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} else {
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uint32_t v = _mesa_roundevenf(f * (float) m);
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return v << bits_frac;
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}
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}
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struct mali_tib_layout {
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unsigned int_r, frac_r;
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unsigned int_g, frac_g;
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unsigned int_b, frac_b;
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unsigned int_a, frac_a;
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};
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static const struct mali_tib_layout tib_layouts[] = {
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[MALI_COLOR_BUFFER_INTERNAL_FORMAT_R8G8B8A8] = { 8, 0, 8, 0, 8, 0, 8, 0 },
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[MALI_COLOR_BUFFER_INTERNAL_FORMAT_R10G10B10A2] = { 10, 0, 10, 0, 10, 0, 2, 0 },
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[MALI_COLOR_BUFFER_INTERNAL_FORMAT_R8G8B8A2] = { 8, 2, 8, 2, 8, 2, 2, 0 },
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[MALI_COLOR_BUFFER_INTERNAL_FORMAT_R4G4B4A4] = { 4, 4, 4, 4, 4, 4, 4, 4 },
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[MALI_COLOR_BUFFER_INTERNAL_FORMAT_R5G6B5A0] = { 5, 5, 6, 4, 5, 5, 0, 2 },
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[MALI_COLOR_BUFFER_INTERNAL_FORMAT_R5G5B5A1] = { 5, 5, 5, 5, 5, 5, 1, 1 },
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};
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/* Raw values are stored as-is but replicated for multisampling */
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static void
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pan_pack_raw(uint32_t *packed, const union pipe_color_union *color, enum pipe_format format)
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{
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union util_color out = { 0 };
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unsigned size = util_format_get_blocksize(format);
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assert(size <= 16);
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util_pack_color(color->f, format, &out);
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if (size == 1) {
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unsigned s = out.ui[0] | (out.ui[0] << 8);
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pan_pack_color_32(packed, s | (s << 16));
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} else if (size == 2)
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pan_pack_color_32(packed, out.ui[0] | (out.ui[0] << 16));
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else if (size <= 4)
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pan_pack_color_32(packed, out.ui[0]);
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else if (size <= 8) {
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memcpy(packed + 0, out.ui, 8);
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memcpy(packed + 2, out.ui, 8);
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} else {
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memcpy(packed, out.ui, 16);
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}
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}
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void
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pan_pack_color(uint32_t *packed, const union pipe_color_union *color,
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enum pipe_format format, bool dithered)
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{
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/* Set of blendable formats is common across versions. TODO: v9 */
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enum mali_color_buffer_internal_format internal =
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panfrost_blendable_formats_v7[format].internal;
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if (internal == MALI_COLOR_BUFFER_INTERNAL_FORMAT_RAW_VALUE) {
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pan_pack_raw(packed, color, format);
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return;
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}
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/* Saturate to [0, 1] by definition of UNORM. Prevents overflow. */
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float r = SATURATE(color->f[0]);
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float g = SATURATE(color->f[1]);
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float b = SATURATE(color->f[2]);
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float a = SATURATE(color->f[3]);
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/* Fill in alpha = 1.0 by default */
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if (!util_format_has_alpha(format))
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a = 1.0;
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/* Convert colourspace while we still have floats */
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if (util_format_is_srgb(format)) {
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r = util_format_linear_to_srgb_float(r);
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g = util_format_linear_to_srgb_float(g);
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b = util_format_linear_to_srgb_float(b);
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}
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/* Look up the layout of the tilebuffer */
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assert(internal < ARRAY_SIZE(tib_layouts));
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struct mali_tib_layout l = tib_layouts[internal];
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unsigned count_r = l.int_r + l.frac_r;
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unsigned count_g = l.int_g + l.frac_g + count_r;
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unsigned count_b = l.int_b + l.frac_b + count_g;
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ASSERTED unsigned count_a = l.int_a + l.frac_a + count_b;
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/* Must fill the word */
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assert(count_a == 32);
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/* Convert the transformed float colour to the given layout */
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uint32_t ur = float_to_fixed(r, l.int_r, l.frac_r, dithered) << 0;
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uint32_t ug = float_to_fixed(g, l.int_g, l.frac_g, dithered) << count_r;
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uint32_t ub = float_to_fixed(b, l.int_b, l.frac_b, dithered) << count_g;
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uint32_t ua = float_to_fixed(a, l.int_a, l.frac_a, dithered) << count_b;
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pan_pack_color_32(packed, ur | ug | ub | ua);
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}
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