VertexRoutine.cpp - Android社区 - https://www.androidos.net.cn/

// Copyright 2016 The SwiftShader Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "VertexRoutine.hpp"

#include "VertexShader.hpp"
#include "Vertex.hpp"
#include "Half.hpp"
#include "Renderer.hpp"
#include "Constants.hpp"
#include "Debug.hpp"

namespace sw
{
	extern bool halfIntegerCoordinates;     // Pixel centers are not at integer coordinates
	extern bool symmetricNormalizedDepth;   // [-1, 1] instead of [0, 1]

VertexRoutine::VertexRoutine(const VertexProcessor::State &state, const VertexShader *shader)
		: v(shader && shader->dynamicallyIndexedInput),
		  o(shader && shader->dynamicallyIndexedOutput),
		  state(state)
	{
	}

VertexRoutine::~VertexRoutine()
	{
	}

void VertexRoutine::generate()
	{
		const bool textureSampling = state.textureSampling;

Pointer<Byte> cache = task + OFFSET(VertexTask,vertexCache);
		Pointer<Byte> vertexCache = cache + OFFSET(VertexCache,vertex);
		Pointer<Byte> tagCache = cache + OFFSET(VertexCache,tag);

UInt vertexCount = *Pointer<UInt>(task + OFFSET(VertexTask,vertexCount));
		UInt primitiveNumber = *Pointer<UInt>(task + OFFSET(VertexTask, primitiveStart));
		UInt indexInPrimitive = 0;

constants = *Pointer<Pointer<Byte>>(data + OFFSET(DrawData,constants));

Do
		{
			UInt index = *Pointer<UInt>(batch);
			UInt tagIndex = index & 0x0000003C;
			UInt indexQ = !textureSampling ? UInt(index & 0xFFFFFFFC) : index;   // FIXME: TEXLDL hack to have independent LODs, hurts performance.

If(*Pointer<UInt>(tagCache + tagIndex) != indexQ)
			{
				*Pointer<UInt>(tagCache + tagIndex) = indexQ;

readInput(indexQ);
				pipeline();
				postTransform();
				computeClipFlags();

Pointer<Byte> cacheLine0 = vertexCache + tagIndex * UInt((int)sizeof(Vertex));
				writeCache(cacheLine0);
			}

UInt cacheIndex = index & 0x0000003F;
			Pointer<Byte> cacheLine = vertexCache + cacheIndex * UInt((int)sizeof(Vertex));
			writeVertex(vertex, cacheLine);

if(state.transformFeedbackEnabled != 0)
			{
				transformFeedback(vertex, primitiveNumber, indexInPrimitive);

indexInPrimitive++;
				If(indexInPrimitive == 3)
				{
					primitiveNumber++;
					indexInPrimitive = 0;
				}
			}

vertex += sizeof(Vertex);
			batch += sizeof(unsigned int);
			vertexCount--;
		}
		Until(vertexCount == 0)

Return();
	}

void VertexRoutine::readInput(UInt &index)
	{
		for(int i = 0; i < MAX_VERTEX_INPUTS; i++)
		{
			Pointer<Byte> input = *Pointer<Pointer<Byte>>(data + OFFSET(DrawData,input) + sizeof(void*) * i);
			UInt stride = *Pointer<UInt>(data + OFFSET(DrawData,stride) + sizeof(unsigned int) * i);

v[i] = readStream(input, stride, state.input[i], index);
		}
	}

void VertexRoutine::computeClipFlags()
	{
		int pos = state.positionRegister;

Int4 maxX = CmpLT(o[pos].w, o[pos].x);
		Int4 maxY = CmpLT(o[pos].w, o[pos].y);
		Int4 maxZ = CmpLT(o[pos].w, o[pos].z);
		Int4 minX = CmpNLE(-o[pos].w, o[pos].x);
		Int4 minY = CmpNLE(-o[pos].w, o[pos].y);
		Int4 minZ = symmetricNormalizedDepth ? CmpNLE(-o[pos].w, o[pos].z) : CmpNLE(Float4(0.0f), o[pos].z);

clipFlags = *Pointer<Int>(constants + OFFSET(Constants,maxX) + SignMask(maxX) * 4);   // FIXME: Array indexing
		clipFlags |= *Pointer<Int>(constants + OFFSET(Constants,maxY) + SignMask(maxY) * 4);
		clipFlags |= *Pointer<Int>(constants + OFFSET(Constants,maxZ) + SignMask(maxZ) * 4);
		clipFlags |= *Pointer<Int>(constants + OFFSET(Constants,minX) + SignMask(minX) * 4);
		clipFlags |= *Pointer<Int>(constants + OFFSET(Constants,minY) + SignMask(minY) * 4);
		clipFlags |= *Pointer<Int>(constants + OFFSET(Constants,minZ) + SignMask(minZ) * 4);

Int4 finiteX = CmpLE(Abs(o[pos].x), *Pointer<Float4>(constants + OFFSET(Constants,maxPos)));
		Int4 finiteY = CmpLE(Abs(o[pos].y), *Pointer<Float4>(constants + OFFSET(Constants,maxPos)));
		Int4 finiteZ = CmpLE(Abs(o[pos].z), *Pointer<Float4>(constants + OFFSET(Constants,maxPos)));

Int4 finiteXYZ = finiteX & finiteY & finiteZ;
		clipFlags |= *Pointer<Int>(constants + OFFSET(Constants,fini) + SignMask(finiteXYZ) * 4);

if(state.preTransformed)
		{
			clipFlags &= 0xFBFBFBFB;   // Don't clip against far clip plane
		}
	}

Vector4f VertexRoutine::readStream(Pointer<Byte> &buffer, UInt &stride, const Stream &stream, const UInt &index)
	{
		const bool textureSampling = state.textureSampling;

Vector4f v;

Pointer<Byte> source0 = buffer + index * stride;
		Pointer<Byte> source1 = source0 + (!textureSampling ? stride : 0);
		Pointer<Byte> source2 = source1 + (!textureSampling ? stride : 0);
		Pointer<Byte> source3 = source2 + (!textureSampling ? stride : 0);

switch(stream.type)
		{
		case STREAMTYPE_FLOAT:
			{
				if(stream.count == 0)
				{
					// Null stream, all default components
				}
				else if(stream.count == 1)
				{
					v.x.x = *Pointer<Float>(source0);
					v.x.y = *Pointer<Float>(source1);
					v.x.z = *Pointer<Float>(source2);
					v.x.w = *Pointer<Float>(source3);
				}
				else
				{
					v.x = *Pointer<Float4>(source0);
					v.y = *Pointer<Float4>(source1);
					v.z = *Pointer<Float4>(source2);
					v.w = *Pointer<Float4>(source3);

transpose4xN(v.x, v.y, v.z, v.w, stream.count);
				}
			}
			break;
		case STREAMTYPE_BYTE:
			{
				v.x = Float4(*Pointer<Byte4>(source0));
				v.y = Float4(*Pointer<Byte4>(source1));
				v.z = Float4(*Pointer<Byte4>(source2));
				v.w = Float4(*Pointer<Byte4>(source3));