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https://github.com/dolphin-emu/dolphin.git
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136 lines
3.7 KiB
C++
136 lines
3.7 KiB
C++
// Copyright 2008 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include <algorithm>
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#include <bit>
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#include "Common/BitUtils.h"
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#include "Common/CommonTypes.h"
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#include "VideoCommon/BPMemory.h"
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// These are accurate (disregarding AA modes).
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constexpr u32 EFB_WIDTH = 640u;
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constexpr u32 EFB_HEIGHT = 528u;
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// Max XFB width is 720. You can only copy out 640 wide areas of efb to XFB
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// so you need multiple copies to do the full width.
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// The VI can do horizontal scaling (TODO: emulate).
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constexpr u32 MAX_XFB_WIDTH = 720u;
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// Although EFB height is 528, 576-line XFB's can be created either with
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// vertical scaling by the EFB copy operation or copying to multiple XFB's
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// that are next to each other in memory (TODO: handle that situation).
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constexpr u32 MAX_XFB_HEIGHT = 576u;
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#define PRIM_LOG(t, ...) DEBUG_LOG_FMT(VIDEO, t __VA_OPT__(, ) __VA_ARGS__)
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// warning: mapping buffer should be disabled to use this
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// #define LOG_VTX() DEBUG_LOG_FMT(VIDEO, "vtx: {} {} {}, ",
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// ((float*)g_vertex_manager_write_ptr)[-3],
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// ((float*)g_vertex_manager_write_ptr)[-2],
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// ((float*)g_vertex_manager_write_ptr)[-1]);
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#define LOG_VTX()
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enum class APIType
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{
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OpenGL,
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D3D,
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Vulkan,
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Metal,
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Nothing
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};
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inline u32 RGBA8ToRGBA6ToRGBA8(u32 src)
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{
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u32 color = src;
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color &= 0xFCFCFCFC;
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color |= (color >> 6) & 0x03030303;
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return color;
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}
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inline u32 RGBA8ToRGB565ToRGBA8(u32 src)
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{
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u32 color = (src & 0xF8FCF8);
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color |= (color >> 5) & 0x070007;
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color |= (color >> 6) & 0x000300;
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color |= 0xFF000000;
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return color;
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}
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inline u32 Z24ToZ16ToZ24(u32 src)
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{
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return (src & 0xFFFF00) | (src >> 16);
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}
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inline u32 CompressZ16(u32 z24depth, DepthFormat format)
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{
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// Flipper offers a number of choices for 16bit Z formats that adjust
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// where the bulk of the precision lies.
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if (format == DepthFormat::ZLINEAR)
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{
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// This is just a linear depth buffer with 16 bits of precision
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return z24depth >> 8;
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}
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// ZNEAR/ZMID/ZFAR are custom floating point formats with 2/3/4 bits of exponent
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// The exponent is simply the number of leading ones that have been removed
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// The first zero bit is skipped and not stored. The mantissa contains the next 14/13/12 bits
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// If exponent is at the MAX (3, 7, or 12) then the next bit might still be a one, and can't
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// be skipped, so the mantissa simply contains the next 14/13/12 bits
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u32 leading_ones = static_cast<u32>(std::countl_one(z24depth << 8));
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bool next_bit_is_one = false; // AKA: Did we clamp leading_ones?
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u32 exp_bits;
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switch (format)
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{
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case DepthFormat::ZNEAR:
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exp_bits = 2;
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if (leading_ones >= 3u)
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{
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leading_ones = 3u;
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next_bit_is_one = true;
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}
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break;
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case DepthFormat::ZMID:
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exp_bits = 3;
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if (leading_ones >= 7u)
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{
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leading_ones = 7u;
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next_bit_is_one = true;
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}
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break;
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case DepthFormat::ZFAR:
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exp_bits = 4;
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if (leading_ones >= 12u)
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{
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// The hardware implementation only uses values 0 to 12 in the exponent
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leading_ones = 12u;
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next_bit_is_one = true;
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}
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break;
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default:
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return z24depth >> 8;
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}
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u32 mantissa_bits = 16 - exp_bits;
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// Calculate which bits we need to extract from z24depth for our mantissa
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u32 top = std::max<u32>(24 - leading_ones, mantissa_bits);
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if (!next_bit_is_one)
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{
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top -= 1; // We know the next bit is zero, so we don't need to include it.
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}
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u32 bottom = top - mantissa_bits;
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u32 exponent = leading_ones << mantissa_bits; // Upper bits contain exponent
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u32 mantissa = Common::ExtractBits(z24depth, bottom, top - 1);
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return exponent | mantissa;
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}
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