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GPU3D.cpp
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/*
Copyright 2016-2024 melonDS team
This file is part of melonDS.
melonDS is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with melonDS. If not, see http://www.gnu.org/licenses/.
*/
#include <stdio.h>
#include <string.h>
#include <algorithm>
#include "NDS.h"
#include "GPU.h"
#include "FIFO.h"
#include "GPU3D_Soft.h"
#include "Platform.h"
#include "GPU3D.h"
namespace melonDS
{
using Platform::Log;
using Platform::LogLevel;
// 3D engine notes
//
// vertex/polygon RAM is filled when a complete polygon is defined, after it's been culled and clipped
// 04000604 reads from bank used by renderer
// bank used by renderer is emptied at scanline ~192
// banks are swapped at scanline ~194
// TODO: needs more investigation. it's weird.
//
// clipping rules:
// * if a shared vertex in a strip is clipped, affected polygons are converted into single polygons
// strip is resumed at the first eligible polygon
//
// clipping exhibits oddities on the real thing. bad precision? fancy algorithm? TODO: investigate.
//
// vertex color precision:
// * vertex colors are kept at 5-bit during clipping. makes for shitty results.
// * vertex colors are converted to 9-bit before drawing, as such:
// if (x > 0) x = (x << 4) + 0xF
// the added bias affects interpolation.
//
// depth buffer:
// Z-buffering mode: val = ((Z * 0x800 * 0x1000) / W) + 0x7FFEFF (nope, wrong. TODO update)
// W-buffering mode: val = W
//
// formula for clear depth: (GBAtek is wrong there)
// clearZ = (val * 0x200) + 0x1FF;
//
// alpha is 5-bit
//
// matrix push/pop on the position matrix are always applied to the vector matrix too, even in position-only mode
// store/restore too, probably (TODO: confirm)
// (the idea is that each position matrix has an associated vector matrix)
//
// TODO: check if translate works on the vector matrix? seems pointless
//
// viewport Y coordinates are upside-down
//
// several registers are latched upon VBlank, the renderer uses the latched registers
// latched registers include:
// DISP3DCNT
// alpha test ref value
// fog color, offset, density table
// toon table
// edge table
// clear attributes
//
// TODO: check how DISP_1DOT_DEPTH works and whether it's latched
//
// TODO: emulate GPU hanging
// * when calling BEGIN with an incomplete polygon defined
// * probably same with BOXTEST
// * when sending vertices immediately after a BOXTEST
//
// TODO: test results should probably not be presented immediately, even if we set the busy flag
// command execution notes
//
// timings given by GBAtek are for individual commands
// actual display lists have different timing characteristics
// * vertex pipeline: individual vertex commands are able to execute in parallel
// with certain other commands
// * similarly, the normal command can execute in parallel with a subsequent vertex
// * polygon pipeline: each vertex which completes a polygon takes longer to run
// and imposes rules on when further vertex commands can run
// (one every 9-cycle time slot during polygon setup)
// polygon setup time is 27 cycles for a triangle and 36 for a quad
// except: only one time slot is taken if the polygon is rejected by culling/clipping
// * additionally, some commands (BEGIN, LIGHT_VECTOR, BOXTEST) stall the polygon pipeline
const u8 CmdNumParams[256] =
{
// 0x00
0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// 0x10
1, 0, 1, 1, 1, 0, 16, 12, 16, 12, 9, 3, 3,
0, 0, 0,
// 0x20
1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1,
0, 0, 0, 0,
// 0x30
1, 1, 1, 1, 32,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// 0x40
1, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// 0x50
1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// 0x60
1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// 0x70
3, 2, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// 0x80+
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
void MatrixLoadIdentity(s32* m);
GPU3D::GPU3D(melonDS::NDS& nds, std::unique_ptr<Renderer3D>&& renderer) noexcept :
NDS(nds),
CurrentRenderer(renderer ? std::move(renderer) : std::make_unique<SoftRenderer>())
{
}
void Vertex::DoSavestate(Savestate* file) noexcept
{
file->VarArray(Position, sizeof(Position));
file->VarArray(Color, sizeof(Color));
file->VarArray(TexCoords, sizeof(TexCoords));
file->Bool32(&Clipped);
file->VarArray(FinalPosition, sizeof(FinalPosition));
file->VarArray(FinalColor, sizeof(FinalColor));
file->VarArray(HiresPosition, sizeof(HiresPosition));
}
void GPU3D::SetCurrentRenderer(std::unique_ptr<Renderer3D>&& renderer) noexcept
{
CurrentRenderer = std::move(renderer);
CurrentRenderer->Reset(NDS.GPU);
}
void GPU3D::ResetRenderingState() noexcept
{
RenderNumPolygons = 0;
RenderDispCnt = 0;
RenderAlphaRef = 0;
memset(RenderEdgeTable, 0, 8*2);
memset(RenderToonTable, 0, 32*2);
RenderFogColor = 0;
RenderFogOffset = 0;
RenderFogShift = 0;
memset(RenderFogDensityTable, 0, 34);
RenderClearAttr1 = 0x3F000000;
RenderClearAttr2 = 0x00007FFF;
}
void GPU3D::Reset() noexcept
{
CmdFIFO.Clear();
CmdPIPE.Clear();
CmdStallQueue.Clear();
ZeroDotWLimit = 0xFFFFFF;
GXStat = 0;
memset(ExecParams, 0, 32*4);
ExecParamCount = 0;
CycleCount = 0;
VertexPipeline = 0;
NormalPipeline = 0;
PolygonPipeline = 0;
VertexSlotCounter = 0;
VertexSlotsFree = 1;
NumPushPopCommands = 0;
NumTestCommands = 0;
MatrixMode = 0;
MatrixLoadIdentity(ProjMatrix);
MatrixLoadIdentity(PosMatrix);
MatrixLoadIdentity(VecMatrix);
MatrixLoadIdentity(TexMatrix);
ClipMatrixDirty = true;
UpdateClipMatrix();
memset(Viewport, 0, sizeof(Viewport));
memset(ProjMatrixStack, 0, 16*4);
memset(PosMatrixStack, 0, 31 * 16*4);
memset(VecMatrixStack, 0, 31 * 16*4);
memset(TexMatrixStack, 0, 16*4);
ProjMatrixStackPointer = 0;
PosMatrixStackPointer = 0;
TexMatrixStackPointer = 0;
NumCommands = 0;
CurCommand = 0;
ParamCount = 0;
TotalParams = 0;
GeometryEnabled = false;
RenderingEnabled = false;
DispCnt = 0;
AlphaRefVal = 0;
AlphaRef = 0;
memset(ToonTable, 0, sizeof(ToonTable));
memset(EdgeTable, 0, sizeof(EdgeTable));
// TODO: confirm initial polyid/color/fog values
FogOffset = 0;
FogColor = 0;
memset(FogDensityTable, 0, sizeof(FogDensityTable));
ClearAttr1 = 0x3F000000;
ClearAttr2 = 0x00007FFF;
ResetRenderingState();
AbortFrame = false;
Timestamp = 0;
PolygonMode = 0;
memset(CurVertex, 0, sizeof(CurVertex));
memset(VertexColor, 0, sizeof(VertexColor));
memset(TexCoords, 0, sizeof(TexCoords));
memset(RawTexCoords, 0, sizeof(RawTexCoords));
memset(Normal, 0, sizeof(Normal));
memset(LightDirection, 0, sizeof(LightDirection));
memset(LightColor, 0, sizeof(LightColor));
memset(MatDiffuse, 0, sizeof(MatDiffuse));
memset(MatAmbient, 0, sizeof(MatAmbient));
memset(MatSpecular, 0, sizeof(MatSpecular));
memset(MatEmission, 0, sizeof(MatSpecular));
UseShininessTable = false;
// Shininess table seems to be uninitialized garbage, at least on n3dsxl hw?
// Also doesn't seem to be cleared properly unless the system is fully powered off?
memset(ShininessTable, 0, sizeof(ShininessTable));
PolygonAttr = 0;
CurPolygonAttr = 0;
TexParam = 0;
TexPalette = 0;
memset(PosTestResult, 0, 4*4);
memset(VecTestResult, 0, 2*3);
memset(TempVertexBuffer, 0, sizeof(TempVertexBuffer));
VertexNum = 0;
VertexNumInPoly = 0;
NumConsecutivePolygons = 0;
LastStripPolygon = nullptr;
NumOpaquePolygons = 0;
CurVertexRAM = &VertexRAM[0];
CurPolygonRAM = &PolygonRAM[0];
NumVertices = 0;
NumPolygons = 0;
CurRAMBank = 0;
FlushRequest = 0;
FlushAttributes = 0;
RenderXPos = 0;
if (CurrentRenderer)
CurrentRenderer->Reset(NDS.GPU);
}
void GPU3D::DoSavestate(Savestate* file) noexcept
{
file->Section("GP3D");
SoftRenderer* softRenderer = dynamic_cast<SoftRenderer*>(CurrentRenderer.get());
if (softRenderer && softRenderer->IsThreaded())
{
softRenderer->SetupRenderThread(NDS.GPU);
}
CmdFIFO.DoSavestate(file);
CmdPIPE.DoSavestate(file);
file->Var32(&NumCommands);
file->Var32(&CurCommand);
file->Var32(&ParamCount);
file->Var32(&TotalParams);
file->Var32(&NumPushPopCommands);
file->Var32(&NumTestCommands);
file->Var32(&DispCnt);
file->Var8(&AlphaRefVal);
file->Var8(&AlphaRef);
file->VarArray(ToonTable, 32*2);
file->VarArray(EdgeTable, 8*2);
file->Var32(&FogColor);
file->Var32(&FogOffset);
file->VarArray(FogDensityTable, 32);
file->Var32(&ClearAttr1);
file->Var32(&ClearAttr2);
file->Var32(&RenderDispCnt);
file->Var8(&RenderAlphaRef);
file->VarArray(RenderToonTable, 32*2);
file->VarArray(RenderEdgeTable, 8*2);
file->Var32(&RenderFogColor);
file->Var32(&RenderFogOffset);
file->Var32(&RenderFogShift);
file->VarArray(RenderFogDensityTable, 34);
file->Var32(&RenderClearAttr1);
file->Var32(&RenderClearAttr2);
file->Var16(&RenderXPos);
file->Var32(&ZeroDotWLimit);
file->Var32(&GXStat);
file->VarArray(ExecParams, 32*4);
file->Var32(&ExecParamCount);
file->Var32((u32*)&CycleCount);
file->Var64(&Timestamp);
file->Var32(&MatrixMode);
file->VarArray(ProjMatrix, 16*4);
file->VarArray(PosMatrix, 16*4);
file->VarArray(VecMatrix, 16*4);
file->VarArray(TexMatrix, 16*4);
file->VarArray(ProjMatrixStack, 16*4);
file->VarArray(PosMatrixStack, 32*16*4);
file->VarArray(VecMatrixStack, 32*16*4);
file->VarArray(TexMatrixStack, 16*4);
file->Var32((u32*)&ProjMatrixStackPointer);
file->Var32((u32*)&PosMatrixStackPointer);
file->Var32((u32*)&TexMatrixStackPointer);
file->VarArray(Viewport, sizeof(Viewport));
file->VarArray(PosTestResult, 4*4);
file->VarArray(VecTestResult, 2*3);
file->Var32(&VertexNum);
file->Var32(&VertexNumInPoly);
file->Var32(&NumConsecutivePolygons);
for (Vertex& vtx : TempVertexBuffer)
{
vtx.DoSavestate(file);
}
if (file->Saving)
{
u32 index = LastStripPolygon ? (u32)(LastStripPolygon - &PolygonRAM[0]) : UINT32_MAX;
file->Var32(&index);
}
else
{
u32 index = UINT32_MAX;
file->Var32(&index);
LastStripPolygon = (index == UINT32_MAX) ? nullptr : &PolygonRAM[index];
}
file->Var32(&CurRAMBank);
file->Var32(&NumVertices);
file->Var32(&NumPolygons);
file->Var32(&NumOpaquePolygons);
file->Var32(&FlushRequest);
file->Var32(&FlushAttributes);
for (Vertex& vtx : VertexRAM)
{
vtx.DoSavestate(file);
}
for(int i = 0; i < 2048*2; i++)
{
Polygon* poly = &PolygonRAM[i];
// this is a bit ugly, but eh
// we can't save the pointers as-is, that's a bad idea
if (file->Saving)
{
for (int j = 0; j < 10; j++)
{
Vertex* ptr = poly->Vertices[j];
u32 index = ptr ? (u32)(ptr - &VertexRAM[0]) : UINT32_MAX;
file->Var32(&index);
}
}
else
{
for (int j = 0; j < 10; j++)
{
u32 index = UINT32_MAX;
file->Var32(&index);
poly->Vertices[j] = index == UINT32_MAX ? nullptr : &VertexRAM[index];
}
}
file->Var32(&poly->NumVertices);
file->VarArray(poly->FinalZ, sizeof(s32)*10);
file->VarArray(poly->FinalW, sizeof(s32)*10);
file->Bool32(&poly->WBuffer);
file->Var32(&poly->Attr);
file->Var32(&poly->TexParam);
file->Var32(&poly->TexPalette);
file->Bool32(&poly->FacingView);
file->Bool32(&poly->Translucent);
file->Bool32(&poly->IsShadowMask);
file->Bool32(&poly->IsShadow);
if (file->IsAtLeastVersion(4, 1))
file->Var32((u32*)&poly->Type);
else
poly->Type = 0;
file->Var32(&poly->VTop);
file->Var32(&poly->VBottom);
file->Var32((u32*)&poly->YTop);
file->Var32((u32*)&poly->YBottom);
file->Var32((u32*)&poly->XTop);
file->Var32((u32*)&poly->XBottom);
file->Var32(&poly->SortKey);
if (!file->Saving)
{
poly->Degenerate = false;
for (u32 j = 0; j < poly->NumVertices; j++)
{
if (poly->Vertices[j]->Position[3] == 0)
poly->Degenerate = true;
}
if (poly->YBottom > 192) poly->Degenerate = true;
}
}
CmdStallQueue.DoSavestate(file);
file->Var32((u32*)&VertexPipeline);
file->Var32((u32*)&NormalPipeline);
file->Var32((u32*)&PolygonPipeline);
file->Var32((u32*)&VertexSlotCounter);
file->Var32(&VertexSlotsFree);
if (!file->Saving)
{
ClipMatrixDirty = true;
UpdateClipMatrix();
CurVertexRAM = &VertexRAM[CurRAMBank ? 6144 : 0];
CurPolygonRAM = &PolygonRAM[CurRAMBank ? 2048 : 0];
}
file->Var32(&RenderNumPolygons);
if (file->Saving)
{
for (const Polygon* p : RenderPolygonRAM)
{
u32 index = p ? (p - &PolygonRAM[0]) : UINT32_MAX;
file->Var32(&index);
}
}
else
{
for (int i = 0; i < RenderPolygonRAM.size(); ++i)
{
u32 index = UINT32_MAX;
file->Var32(&index);
RenderPolygonRAM[i] = index == UINT32_MAX ? nullptr : &PolygonRAM[index];
}
}
file->VarArray(CurVertex, sizeof(s16)*3);
file->VarArray(VertexColor, sizeof(u8)*3);
file->VarArray(TexCoords, sizeof(s16)*2);
file->VarArray(RawTexCoords, sizeof(s16)*2);
file->VarArray(Normal, sizeof(s16)*3);
file->VarArray(LightDirection, sizeof(s16)*4*3);
file->VarArray(LightColor, sizeof(u8)*4*3);
file->VarArray(MatDiffuse, sizeof(u8)*3);
file->VarArray(MatAmbient, sizeof(u8)*3);
file->VarArray(MatSpecular, sizeof(u8)*3);
file->VarArray(MatEmission, sizeof(u8)*3);
file->Bool32(&UseShininessTable);
file->VarArray(ShininessTable, 128*sizeof(u8));
file->Bool32(&AbortFrame);
file->Bool32(&GeometryEnabled);
file->Bool32(&RenderingEnabled);
file->Var32(&PolygonMode);
file->Var32(&PolygonAttr);
file->Var32(&CurPolygonAttr);
file->Var32(&TexParam);
file->Var32(&TexPalette);
RenderFrameIdentical = false;
if (softRenderer && softRenderer->IsThreaded())
{
softRenderer->EnableRenderThread();
}
}
void GPU3D::SetEnabled(bool geometry, bool rendering) noexcept
{
GeometryEnabled = geometry;
RenderingEnabled = rendering;
if (!rendering) ResetRenderingState();
}
void MatrixLoadIdentity(s32* m)
{
m[0] = 0x1000; m[1] = 0; m[2] = 0; m[3] = 0;
m[4] = 0; m[5] = 0x1000; m[6] = 0; m[7] = 0;
m[8] = 0; m[9] = 0; m[10] = 0x1000; m[11] = 0;
m[12] = 0; m[13] = 0; m[14] = 0; m[15] = 0x1000;
}
void MatrixLoad4x4(s32* m, s32* s)
{
memcpy(m, s, 16*4);
}
void MatrixLoad4x3(s32* m, s32* s)
{
m[0] = s[0]; m[1] = s[1]; m[2] = s[2]; m[3] = 0;
m[4] = s[3]; m[5] = s[4]; m[6] = s[5]; m[7] = 0;
m[8] = s[6]; m[9] = s[7]; m[10] = s[8]; m[11] = 0;
m[12] = s[9]; m[13] = s[10]; m[14] = s[11]; m[15] = 0x1000;
}
void MatrixMult4x4(s32* m, s32* s)
{
s32 tmp[16];
memcpy(tmp, m, 16*4);
// m = s*m
m[0] = ((s64)s[0]*tmp[0] + (s64)s[1]*tmp[4] + (s64)s[2]*tmp[8] + (s64)s[3]*tmp[12]) >> 12;
m[1] = ((s64)s[0]*tmp[1] + (s64)s[1]*tmp[5] + (s64)s[2]*tmp[9] + (s64)s[3]*tmp[13]) >> 12;
m[2] = ((s64)s[0]*tmp[2] + (s64)s[1]*tmp[6] + (s64)s[2]*tmp[10] + (s64)s[3]*tmp[14]) >> 12;
m[3] = ((s64)s[0]*tmp[3] + (s64)s[1]*tmp[7] + (s64)s[2]*tmp[11] + (s64)s[3]*tmp[15]) >> 12;
m[4] = ((s64)s[4]*tmp[0] + (s64)s[5]*tmp[4] + (s64)s[6]*tmp[8] + (s64)s[7]*tmp[12]) >> 12;
m[5] = ((s64)s[4]*tmp[1] + (s64)s[5]*tmp[5] + (s64)s[6]*tmp[9] + (s64)s[7]*tmp[13]) >> 12;
m[6] = ((s64)s[4]*tmp[2] + (s64)s[5]*tmp[6] + (s64)s[6]*tmp[10] + (s64)s[7]*tmp[14]) >> 12;
m[7] = ((s64)s[4]*tmp[3] + (s64)s[5]*tmp[7] + (s64)s[6]*tmp[11] + (s64)s[7]*tmp[15]) >> 12;
m[8] = ((s64)s[8]*tmp[0] + (s64)s[9]*tmp[4] + (s64)s[10]*tmp[8] + (s64)s[11]*tmp[12]) >> 12;
m[9] = ((s64)s[8]*tmp[1] + (s64)s[9]*tmp[5] + (s64)s[10]*tmp[9] + (s64)s[11]*tmp[13]) >> 12;
m[10] = ((s64)s[8]*tmp[2] + (s64)s[9]*tmp[6] + (s64)s[10]*tmp[10] + (s64)s[11]*tmp[14]) >> 12;
m[11] = ((s64)s[8]*tmp[3] + (s64)s[9]*tmp[7] + (s64)s[10]*tmp[11] + (s64)s[11]*tmp[15]) >> 12;
m[12] = ((s64)s[12]*tmp[0] + (s64)s[13]*tmp[4] + (s64)s[14]*tmp[8] + (s64)s[15]*tmp[12]) >> 12;
m[13] = ((s64)s[12]*tmp[1] + (s64)s[13]*tmp[5] + (s64)s[14]*tmp[9] + (s64)s[15]*tmp[13]) >> 12;
m[14] = ((s64)s[12]*tmp[2] + (s64)s[13]*tmp[6] + (s64)s[14]*tmp[10] + (s64)s[15]*tmp[14]) >> 12;
m[15] = ((s64)s[12]*tmp[3] + (s64)s[13]*tmp[7] + (s64)s[14]*tmp[11] + (s64)s[15]*tmp[15]) >> 12;
}
void MatrixMult4x3(s32* m, s32* s)
{
s32 tmp[16];
memcpy(tmp, m, 16*4);
// m = s*m
m[0] = ((s64)s[0]*tmp[0] + (s64)s[1]*tmp[4] + (s64)s[2]*tmp[8]) >> 12;
m[1] = ((s64)s[0]*tmp[1] + (s64)s[1]*tmp[5] + (s64)s[2]*tmp[9]) >> 12;
m[2] = ((s64)s[0]*tmp[2] + (s64)s[1]*tmp[6] + (s64)s[2]*tmp[10]) >> 12;
m[3] = ((s64)s[0]*tmp[3] + (s64)s[1]*tmp[7] + (s64)s[2]*tmp[11]) >> 12;
m[4] = ((s64)s[3]*tmp[0] + (s64)s[4]*tmp[4] + (s64)s[5]*tmp[8]) >> 12;
m[5] = ((s64)s[3]*tmp[1] + (s64)s[4]*tmp[5] + (s64)s[5]*tmp[9]) >> 12;
m[6] = ((s64)s[3]*tmp[2] + (s64)s[4]*tmp[6] + (s64)s[5]*tmp[10]) >> 12;
m[7] = ((s64)s[3]*tmp[3] + (s64)s[4]*tmp[7] + (s64)s[5]*tmp[11]) >> 12;
m[8] = ((s64)s[6]*tmp[0] + (s64)s[7]*tmp[4] + (s64)s[8]*tmp[8]) >> 12;
m[9] = ((s64)s[6]*tmp[1] + (s64)s[7]*tmp[5] + (s64)s[8]*tmp[9]) >> 12;
m[10] = ((s64)s[6]*tmp[2] + (s64)s[7]*tmp[6] + (s64)s[8]*tmp[10]) >> 12;
m[11] = ((s64)s[6]*tmp[3] + (s64)s[7]*tmp[7] + (s64)s[8]*tmp[11]) >> 12;
m[12] = ((s64)s[9]*tmp[0] + (s64)s[10]*tmp[4] + (s64)s[11]*tmp[8] + (s64)0x1000*tmp[12]) >> 12;
m[13] = ((s64)s[9]*tmp[1] + (s64)s[10]*tmp[5] + (s64)s[11]*tmp[9] + (s64)0x1000*tmp[13]) >> 12;
m[14] = ((s64)s[9]*tmp[2] + (s64)s[10]*tmp[6] + (s64)s[11]*tmp[10] + (s64)0x1000*tmp[14]) >> 12;
m[15] = ((s64)s[9]*tmp[3] + (s64)s[10]*tmp[7] + (s64)s[11]*tmp[11] + (s64)0x1000*tmp[15]) >> 12;
}
void MatrixMult3x3(s32* m, s32* s)
{
s32 tmp[12];
memcpy(tmp, m, 12*4);
// m = s*m
m[0] = ((s64)s[0]*tmp[0] + (s64)s[1]*tmp[4] + (s64)s[2]*tmp[8]) >> 12;
m[1] = ((s64)s[0]*tmp[1] + (s64)s[1]*tmp[5] + (s64)s[2]*tmp[9]) >> 12;
m[2] = ((s64)s[0]*tmp[2] + (s64)s[1]*tmp[6] + (s64)s[2]*tmp[10]) >> 12;
m[3] = ((s64)s[0]*tmp[3] + (s64)s[1]*tmp[7] + (s64)s[2]*tmp[11]) >> 12;
m[4] = ((s64)s[3]*tmp[0] + (s64)s[4]*tmp[4] + (s64)s[5]*tmp[8]) >> 12;
m[5] = ((s64)s[3]*tmp[1] + (s64)s[4]*tmp[5] + (s64)s[5]*tmp[9]) >> 12;
m[6] = ((s64)s[3]*tmp[2] + (s64)s[4]*tmp[6] + (s64)s[5]*tmp[10]) >> 12;
m[7] = ((s64)s[3]*tmp[3] + (s64)s[4]*tmp[7] + (s64)s[5]*tmp[11]) >> 12;
m[8] = ((s64)s[6]*tmp[0] + (s64)s[7]*tmp[4] + (s64)s[8]*tmp[8]) >> 12;
m[9] = ((s64)s[6]*tmp[1] + (s64)s[7]*tmp[5] + (s64)s[8]*tmp[9]) >> 12;
m[10] = ((s64)s[6]*tmp[2] + (s64)s[7]*tmp[6] + (s64)s[8]*tmp[10]) >> 12;
m[11] = ((s64)s[6]*tmp[3] + (s64)s[7]*tmp[7] + (s64)s[8]*tmp[11]) >> 12;
}
void MatrixScale(s32* m, s32* s)
{
m[0] = ((s64)s[0]*m[0]) >> 12;
m[1] = ((s64)s[0]*m[1]) >> 12;
m[2] = ((s64)s[0]*m[2]) >> 12;
m[3] = ((s64)s[0]*m[3]) >> 12;
m[4] = ((s64)s[1]*m[4]) >> 12;
m[5] = ((s64)s[1]*m[5]) >> 12;
m[6] = ((s64)s[1]*m[6]) >> 12;
m[7] = ((s64)s[1]*m[7]) >> 12;
m[8] = ((s64)s[2]*m[8]) >> 12;
m[9] = ((s64)s[2]*m[9]) >> 12;
m[10] = ((s64)s[2]*m[10]) >> 12;
m[11] = ((s64)s[2]*m[11]) >> 12;
}
void MatrixTranslate(s32* m, s32* s)
{
m[12] += ((s64)s[0]*m[0] + (s64)s[1]*m[4] + (s64)s[2]*m[8]) >> 12;
m[13] += ((s64)s[0]*m[1] + (s64)s[1]*m[5] + (s64)s[2]*m[9]) >> 12;
m[14] += ((s64)s[0]*m[2] + (s64)s[1]*m[6] + (s64)s[2]*m[10]) >> 12;
m[15] += ((s64)s[0]*m[3] + (s64)s[1]*m[7] + (s64)s[2]*m[11]) >> 12;
}
void GPU3D::UpdateClipMatrix() noexcept
{
if (!ClipMatrixDirty) return;
ClipMatrixDirty = false;
memcpy(ClipMatrix, ProjMatrix, 16*4);
MatrixMult4x4(ClipMatrix, PosMatrix);
}
void GPU3D::AddCycles(s32 num) noexcept
{
CycleCount += num;
if (VertexPipeline > 0)
{
if (VertexPipeline > num) VertexPipeline -= num;
else VertexPipeline = 0;
}
if (PolygonPipeline > 0)
{
if (PolygonPipeline > num)
{
PolygonPipeline -= num;
VertexSlotCounter += num;
while (VertexSlotCounter > 9)
{
VertexSlotCounter -= 9;
VertexSlotsFree >>= 1;
}
}
else
{
PolygonPipeline = 0;
VertexSlotCounter = 0;
VertexSlotsFree = 0x1;
}
}
}
void GPU3D::NextVertexSlot() noexcept
{
s32 num = (9 - VertexSlotCounter) + 1;
for (;;)
{
CycleCount += num;
if (VertexPipeline > 0)
{
if (VertexPipeline > num) VertexPipeline -= num;
else VertexPipeline = 0;
}
if (PolygonPipeline > 0)
{
if (PolygonPipeline > num)
{
PolygonPipeline -= num;
VertexSlotCounter = 1;
VertexSlotsFree >>= 1;
if (VertexSlotsFree & 0x1)
{
VertexSlotsFree &= ~0x1;
break;
}
else
{
num = 9;
continue;
}
}
else
{
PolygonPipeline = 0;
VertexSlotCounter = 0;
VertexSlotsFree = 1;
break;
}
}
}
}
void GPU3D::StallPolygonPipeline(s32 delay, s32 nonstalldelay) noexcept
{
if (PolygonPipeline > 0)
{
CycleCount += PolygonPipeline + delay;
// can be safely assumed those two will go to zero
VertexPipeline = 0;
NormalPipeline = 0;
PolygonPipeline = 0;
VertexSlotCounter = 0;
VertexSlotsFree = 1;
}
else
{
if (VertexPipeline > nonstalldelay)
AddCycles((VertexPipeline - nonstalldelay) + 1);
else
AddCycles(NormalPipeline + 1);
}
}
template<int comp, s32 plane, bool attribs>
void ClipSegment(Vertex* outbuf, Vertex* vin, Vertex* vout)
{
s64 factor_num = vin->Position[3] - (plane*vin->Position[comp]);
s32 factor_den = factor_num - (vout->Position[3] - (plane*vout->Position[comp]));
#define INTERPOLATE(var) { outbuf->var = (vin->var + ((vout->var - vin->var) * factor_num) / factor_den); }
if (comp != 0) INTERPOLATE(Position[0]);
if (comp != 1) INTERPOLATE(Position[1]);
if (comp != 2) INTERPOLATE(Position[2]);
INTERPOLATE(Position[3]);
outbuf->Position[comp] = plane*outbuf->Position[3];
if (attribs)
{
INTERPOLATE(Color[0]);
INTERPOLATE(Color[1]);
INTERPOLATE(Color[2]);
INTERPOLATE(TexCoords[0]);
INTERPOLATE(TexCoords[1]);
}
outbuf->Clipped = true;
#undef INTERPOLATE
}
template<int comp, bool attribs>
int ClipAgainstPlane(const GPU3D& gpu, Vertex* vertices, int nverts, int clipstart)
{
Vertex temp[10];
int prev, next;
int c = clipstart;
if (clipstart == 2)
{
temp[0] = vertices[0];
temp[1] = vertices[1];
}
for (int i = clipstart; i < nverts; i++)
{
prev = i-1; if (prev < 0) prev = nverts-1;
next = i+1; if (next >= nverts) next = 0;
Vertex vtx = vertices[i];
if (vtx.Position[comp] > vtx.Position[3])
{
if ((comp == 2) && (!(gpu.CurPolygonAttr & (1<<12)))) return 0;
Vertex* vprev = &vertices[prev];
if (vprev->Position[comp] <= vprev->Position[3])
{
ClipSegment<comp, 1, attribs>(&temp[c], &vtx, vprev);
c++;
}
Vertex* vnext = &vertices[next];
if (vnext->Position[comp] <= vnext->Position[3])
{
ClipSegment<comp, 1, attribs>(&temp[c], &vtx, vnext);
c++;
}
}
else
temp[c++] = vtx;
}
nverts = c; c = clipstart;
for (int i = clipstart; i < nverts; i++)
{
prev = i-1; if (prev < 0) prev = nverts-1;
next = i+1; if (next >= nverts) next = 0;
Vertex vtx = temp[i];
if (vtx.Position[comp] < -vtx.Position[3])
{
Vertex* vprev = &temp[prev];
if (vprev->Position[comp] >= -vprev->Position[3])
{
ClipSegment<comp, -1, attribs>(&vertices[c], &vtx, vprev);
c++;
}
Vertex* vnext = &temp[next];
if (vnext->Position[comp] >= -vnext->Position[3])
{
ClipSegment<comp, -1, attribs>(&vertices[c], &vtx, vnext);
c++;
}
}
else
vertices[c++] = vtx;
}
// checkme
for (int i = 0; i < c; i++)
{
Vertex* vtx = &vertices[i];
vtx->Color[0] &= ~0xFFF; vtx->Color[0] += 0xFFF;
vtx->Color[1] &= ~0xFFF; vtx->Color[1] += 0xFFF;
vtx->Color[2] &= ~0xFFF; vtx->Color[2] += 0xFFF;
}
return c;
}
template<bool attribs>
int ClipPolygon(GPU3D& gpu, Vertex* vertices, int nverts, int clipstart)
{
// clip.
// for each vertex:
// if it's outside, check if the previous and next vertices are inside
// if so, place a new vertex at the edge of the view volume
// TODO: check for 1-dot polygons
// TODO: the hardware seems to use a different algorithm. it reacts differently to vertices with W=0
// some vertices that should get Y=-0x1000 get Y=0x1000 for some reason on hardware. it doesn't make sense.
// clipping seems to process the Y plane before the X plane.
// Z clipping
nverts = ClipAgainstPlane<2, attribs>(gpu, vertices, nverts, clipstart);
// Y clipping
nverts = ClipAgainstPlane<1, attribs>(gpu, vertices, nverts, clipstart);
// X clipping
nverts = ClipAgainstPlane<0, attribs>(gpu, vertices, nverts, clipstart);
return nverts;
}
bool ClipCoordsEqual(Vertex* a, Vertex* b)
{
return a->Position[0] == b->Position[0] &&
a->Position[1] == b->Position[1] &&
a->Position[2] == b->Position[2] &&
a->Position[3] == b->Position[3];
}
void GPU3D::SubmitPolygon() noexcept
{
Vertex clippedvertices[10];
Vertex* reusedvertices[2];
int clipstart = 0;
int lastpolyverts = 0;
int nverts = PolygonMode & 0x1 ? 4:3;
int prev, next;
// submitting a polygon starts the polygon pipeline
// noting that for now we are only reserving one vertex slot
// further slots only get reserved if the polygon makes it through culling/clipping
PolygonPipeline = 8;
VertexSlotCounter = 1;
VertexSlotsFree = 0b11110;
// culling
// TODO: work out how it works on the real thing
// the normalization part is a wild guess
Vertex *v0, *v1, *v2, *v3;
s64 normalX, normalY, normalZ;
s64 dot;
v0 = &TempVertexBuffer[0];
v1 = &TempVertexBuffer[1];
v2 = &TempVertexBuffer[2];
v3 = &TempVertexBuffer[3];
normalX = ((s64)(v0->Position[1]-v1->Position[1]) * (v2->Position[3]-v1->Position[3]))
- ((s64)(v0->Position[3]-v1->Position[3]) * (v2->Position[1]-v1->Position[1]));
normalY = ((s64)(v0->Position[3]-v1->Position[3]) * (v2->Position[0]-v1->Position[0]))
- ((s64)(v0->Position[0]-v1->Position[0]) * (v2->Position[3]-v1->Position[3]));
normalZ = ((s64)(v0->Position[0]-v1->Position[0]) * (v2->Position[1]-v1->Position[1]))
- ((s64)(v0->Position[1]-v1->Position[1]) * (v2->Position[0]-v1->Position[0]));
while ((((normalX>>31) ^ (normalX>>63)) != 0) ||
(((normalY>>31) ^ (normalY>>63)) != 0) ||
(((normalZ>>31) ^ (normalZ>>63)) != 0))
{
normalX >>= 4;
normalY >>= 4;
normalZ >>= 4;
}
dot = ((s64)v1->Position[0] * normalX) + ((s64)v1->Position[1] * normalY) + ((s64)v1->Position[3] * normalZ);