357 lines
9.5 KiB
C++
357 lines
9.5 KiB
C++
// Copyright 2008 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include "VideoCommon/IndexGenerator.h"
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#include <array>
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#include <cstddef>
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#include <cstring>
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#include "Common/CommonTypes.h"
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#include "Common/Logging/Log.h"
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#include "VideoCommon/OpcodeDecoding.h"
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#include "VideoCommon/VideoConfig.h"
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namespace
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{
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constexpr u16 s_primitive_restart = UINT16_MAX;
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template <bool pr>
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u16* WriteTriangle(u16* index_ptr, u32 index1, u32 index2, u32 index3)
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{
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*index_ptr++ = index1;
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*index_ptr++ = index2;
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*index_ptr++ = index3;
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if constexpr (pr)
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*index_ptr++ = s_primitive_restart;
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return index_ptr;
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}
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template <bool pr>
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u16* AddList(u16* index_ptr, u32 num_verts, u32 index)
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{
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for (u32 i = 2; i < num_verts; i += 3)
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{
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index_ptr = WriteTriangle<pr>(index_ptr, index + i - 2, index + i - 1, index + i);
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}
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return index_ptr;
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}
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template <bool pr>
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u16* AddStrip(u16* index_ptr, u32 num_verts, u32 index)
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{
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if constexpr (pr)
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{
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for (u32 i = 0; i < num_verts; ++i)
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{
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*index_ptr++ = index + i;
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}
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*index_ptr++ = s_primitive_restart;
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}
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else
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{
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bool wind = false;
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for (u32 i = 2; i < num_verts; ++i)
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{
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index_ptr = WriteTriangle<pr>(index_ptr, index + i - 2, index + i - !wind, index + i - wind);
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wind ^= true;
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}
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}
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return index_ptr;
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}
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/**
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* FAN simulator:
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*
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* 2---3
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* / \ / \
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* 1---0---4
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*
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* would generate this triangles:
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* 012, 023, 034
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*
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* rotated (for better striping):
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* 120, 302, 034
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*
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* as odd ones have to winded, following strip is fine:
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* 12034
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*
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* so we use 6 indices for 3 triangles
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*/
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template <bool pr>
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u16* AddFan(u16* index_ptr, u32 num_verts, u32 index)
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{
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u32 i = 2;
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if constexpr (pr)
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{
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for (; i + 3 <= num_verts; i += 3)
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{
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*index_ptr++ = index + i - 1;
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*index_ptr++ = index + i + 0;
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*index_ptr++ = index;
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*index_ptr++ = index + i + 1;
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*index_ptr++ = index + i + 2;
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*index_ptr++ = s_primitive_restart;
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}
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for (; i + 2 <= num_verts; i += 2)
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{
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*index_ptr++ = index + i - 1;
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*index_ptr++ = index + i + 0;
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*index_ptr++ = index;
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*index_ptr++ = index + i + 1;
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*index_ptr++ = s_primitive_restart;
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}
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}
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for (; i < num_verts; ++i)
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{
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index_ptr = WriteTriangle<pr>(index_ptr, index, index + i - 1, index + i);
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}
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return index_ptr;
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}
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/*
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* QUAD simulator
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*
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* 0---1 4---5
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* |\ | |\ |
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* | \ | | \ |
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* | \| | \|
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* 3---2 7---6
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*
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* 012,023, 456,467 ...
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* or 120,302, 564,746
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* or as strip: 1203, 5647
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*
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* Warning:
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* A simple triangle has to be rendered for three vertices.
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* ZWW do this for sun rays
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*/
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template <bool pr>
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u16* AddQuads(u16* index_ptr, u32 num_verts, u32 index)
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{
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u32 i = 3;
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for (; i < num_verts; i += 4)
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{
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if constexpr (pr)
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{
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*index_ptr++ = index + i - 2;
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*index_ptr++ = index + i - 1;
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*index_ptr++ = index + i - 3;
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*index_ptr++ = index + i - 0;
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*index_ptr++ = s_primitive_restart;
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}
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else
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{
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index_ptr = WriteTriangle<pr>(index_ptr, index + i - 3, index + i - 2, index + i - 1);
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index_ptr = WriteTriangle<pr>(index_ptr, index + i - 3, index + i - 1, index + i - 0);
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}
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}
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// three vertices remaining, so render a triangle
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if (i == num_verts)
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{
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index_ptr = WriteTriangle<pr>(index_ptr, index + num_verts - 3, index + num_verts - 2,
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index + num_verts - 1);
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}
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return index_ptr;
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}
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template <bool pr>
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u16* AddQuads_nonstandard(u16* index_ptr, u32 num_verts, u32 index)
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{
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WARN_LOG_FMT(VIDEO, "Non-standard primitive drawing command GL_DRAW_QUADS_2");
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return AddQuads<pr>(index_ptr, num_verts, index);
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}
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u16* AddLineList(u16* index_ptr, u32 num_verts, u32 index)
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{
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for (u32 i = 1; i < num_verts; i += 2)
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{
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*index_ptr++ = index + i - 1;
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*index_ptr++ = index + i;
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}
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return index_ptr;
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}
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// Shouldn't be used as strips as LineLists are much more common
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// so converting them to lists
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u16* AddLineStrip(u16* index_ptr, u32 num_verts, u32 index)
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{
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for (u32 i = 1; i < num_verts; ++i)
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{
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*index_ptr++ = index + i - 1;
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*index_ptr++ = index + i;
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}
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return index_ptr;
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}
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template <bool pr, bool linestrip>
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u16* AddLines_VSExpand(u16* index_ptr, u32 num_verts, u32 index)
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{
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// VS Expand uses (index >> 2) as the base vertex
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// Bit 0 indicates which side of the line (left/right for a vertical line)
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// Bit 1 indicates which point of the line (top/bottom for a vertical line)
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// VS Expand assumes the two points will be adjacent vertices
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constexpr u32 advance = linestrip ? 1 : 2;
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for (u32 i = 1; i < num_verts; i += advance)
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{
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u32 p0 = (index + i - 1) << 2;
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u32 p1 = (index + i - 0) << 2;
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if constexpr (pr)
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{
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*index_ptr++ = p0 + 0;
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*index_ptr++ = p0 + 1;
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*index_ptr++ = p1 + 2;
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*index_ptr++ = p1 + 3;
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*index_ptr++ = s_primitive_restart;
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}
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else
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{
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*index_ptr++ = p0 + 0;
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*index_ptr++ = p0 + 1;
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*index_ptr++ = p1 + 2;
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*index_ptr++ = p0 + 1;
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*index_ptr++ = p1 + 2;
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*index_ptr++ = p1 + 3;
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}
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}
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return index_ptr;
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}
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u16* AddPoints(u16* index_ptr, u32 num_verts, u32 index)
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{
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for (u32 i = 0; i != num_verts; ++i)
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{
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*index_ptr++ = index + i;
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}
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return index_ptr;
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}
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template <bool pr>
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u16* AddPoints_VSExpand(u16* index_ptr, u32 num_verts, u32 index)
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{
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// VS Expand uses (index >> 2) as the base vertex
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// Bottom two bits indicate which of (TL, TR, BL, BR) this is
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for (u32 i = 0; i < num_verts; ++i)
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{
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u32 base = (index + i) << 2;
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if constexpr (pr)
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{
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*index_ptr++ = base + 0;
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*index_ptr++ = base + 1;
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*index_ptr++ = base + 2;
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*index_ptr++ = base + 3;
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*index_ptr++ = s_primitive_restart;
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}
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else
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{
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*index_ptr++ = base + 0;
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*index_ptr++ = base + 1;
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*index_ptr++ = base + 2;
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*index_ptr++ = base + 1;
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*index_ptr++ = base + 2;
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*index_ptr++ = base + 3;
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}
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}
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return index_ptr;
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}
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} // Anonymous namespace
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void IndexGenerator::Init()
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{
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using OpcodeDecoder::Primitive;
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if (g_Config.backend_info.bSupportsPrimitiveRestart)
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{
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m_primitive_table[Primitive::GX_DRAW_QUADS] = AddQuads<true>;
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m_primitive_table[Primitive::GX_DRAW_QUADS_2] = AddQuads_nonstandard<true>;
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m_primitive_table[Primitive::GX_DRAW_TRIANGLES] = AddList<true>;
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m_primitive_table[Primitive::GX_DRAW_TRIANGLE_STRIP] = AddStrip<true>;
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m_primitive_table[Primitive::GX_DRAW_TRIANGLE_FAN] = AddFan<true>;
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}
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else
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{
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m_primitive_table[Primitive::GX_DRAW_QUADS] = AddQuads<false>;
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m_primitive_table[Primitive::GX_DRAW_QUADS_2] = AddQuads_nonstandard<false>;
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m_primitive_table[Primitive::GX_DRAW_TRIANGLES] = AddList<false>;
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m_primitive_table[Primitive::GX_DRAW_TRIANGLE_STRIP] = AddStrip<false>;
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m_primitive_table[Primitive::GX_DRAW_TRIANGLE_FAN] = AddFan<false>;
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}
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if (g_Config.UseVSForLinePointExpand())
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{
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if (g_Config.backend_info.bSupportsPrimitiveRestart)
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{
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m_primitive_table[Primitive::GX_DRAW_LINES] = AddLines_VSExpand<true, false>;
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m_primitive_table[Primitive::GX_DRAW_LINE_STRIP] = AddLines_VSExpand<true, true>;
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m_primitive_table[Primitive::GX_DRAW_POINTS] = AddPoints_VSExpand<true>;
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}
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else
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{
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m_primitive_table[Primitive::GX_DRAW_LINES] = AddLines_VSExpand<false, false>;
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m_primitive_table[Primitive::GX_DRAW_LINE_STRIP] = AddLines_VSExpand<false, true>;
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m_primitive_table[Primitive::GX_DRAW_POINTS] = AddPoints_VSExpand<false>;
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}
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}
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else
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{
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m_primitive_table[Primitive::GX_DRAW_LINES] = AddLineList;
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m_primitive_table[Primitive::GX_DRAW_LINE_STRIP] = AddLineStrip;
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m_primitive_table[Primitive::GX_DRAW_POINTS] = AddPoints;
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}
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}
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void IndexGenerator::Start(u16* index_ptr)
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{
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m_index_buffer_current = index_ptr;
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m_base_index_ptr = index_ptr;
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m_base_index = 0;
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}
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void IndexGenerator::AddIndices(OpcodeDecoder::Primitive primitive, u32 num_vertices)
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{
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m_index_buffer_current =
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m_primitive_table[primitive](m_index_buffer_current, num_vertices, m_base_index);
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m_base_index += num_vertices;
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}
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void IndexGenerator::AddExternalIndices(const u16* indices, u32 num_indices, u32 num_vertices)
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{
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std::memcpy(m_index_buffer_current, indices, sizeof(u16) * num_indices);
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m_index_buffer_current += num_indices;
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m_base_index += num_vertices;
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}
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u32 IndexGenerator::GetRemainingIndices(OpcodeDecoder::Primitive primitive) const
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{
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u32 max_index = UINT16_MAX;
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if (g_Config.UseVSForLinePointExpand() && primitive >= OpcodeDecoder::Primitive::GX_DRAW_LINES)
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max_index >>= 2;
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// Although we reserve UINT16_MAX for primitive restart, we aren't allowed to use that as an
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// actual index. But, the maximum number of vertices a game can send is UINT16_MAX, so up to
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// 0xffff indices will be used by the game. These indices would be 0x0000 through 0xfffe,
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// and since m_base_index gets incremented for each index used, after that m_base_index
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// would be 0xffff and no indices remain. If a game uses 0xfffe vertices, assuming m_base_index
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// started at 0 it would end at 0xfffe and one more index could be used. So, we do not need to
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// subtract 1 from max_index to correctly reserve one index for primitive restart.
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//
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// Pocoyo Racing uses a draw command with 0xffff vertices, which previously caused issues; see
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// https://bugs.dolphin-emu.org/issues/13136 for details.
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if (m_base_index > max_index) [[unlikely]]
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{
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PanicAlertFmt("GetRemainingIndices would overflow; we've already written too many indices? "
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"base index {} > max index {}",
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m_base_index, max_index);
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return 0;
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}
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return max_index - m_base_index;
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}
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