mirror of
https://github.com/dolphin-emu/dolphin.git
synced 2024-11-15 13:57:57 -07:00
31cfc73a09
Also moved && and || to ends of lines instead of start.
Fixed misc vertical alignments and some { needed newlining.
439 lines
12 KiB
C++
439 lines
12 KiB
C++
// Copyright 2013 Dolphin Emulator Project
|
|
// Licensed under GPLv2
|
|
// Refer to the license.txt file included.
|
|
|
|
/*
|
|
Portions of this file are based off work by Markus Trenkwalder.
|
|
Copyright (c) 2007, 2008 Markus Trenkwalder
|
|
|
|
All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are met:
|
|
|
|
* Redistributions of source code must retain the above copyright notice,
|
|
this list of conditions and the following disclaimer.
|
|
|
|
* Redistributions in binary form must reproduce the above copyright notice,
|
|
this list of conditions and the following disclaimer in the documentation
|
|
and/or other materials provided with the distribution.
|
|
|
|
* Neither the name of the library's copyright owner nor the names of its
|
|
contributors may be used to endorse or promote products derived from this
|
|
software without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
|
|
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
|
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
|
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "VideoBackends/Software/BPMemLoader.h"
|
|
#include "VideoBackends/Software/Clipper.h"
|
|
#include "VideoBackends/Software/NativeVertexFormat.h"
|
|
#include "VideoBackends/Software/Rasterizer.h"
|
|
#include "VideoBackends/Software/SWStatistics.h"
|
|
#include "VideoBackends/Software/XFMemLoader.h"
|
|
|
|
|
|
namespace Clipper
|
|
{
|
|
enum { NUM_CLIPPED_VERTICES = 33, NUM_INDICES = NUM_CLIPPED_VERTICES + 3 };
|
|
|
|
float m_ViewOffset[2];
|
|
|
|
OutputVertexData ClippedVertices[NUM_CLIPPED_VERTICES];
|
|
OutputVertexData *Vertices[NUM_INDICES];
|
|
|
|
void DoState(PointerWrap &p)
|
|
{
|
|
p.DoArray(m_ViewOffset,2);
|
|
for (auto& ClippedVertice : ClippedVertices)
|
|
ClippedVertice.DoState(p);
|
|
}
|
|
|
|
void Init()
|
|
{
|
|
for (int i = 0; i < NUM_CLIPPED_VERTICES; ++i)
|
|
Vertices[i+3] = &ClippedVertices[i];
|
|
}
|
|
|
|
void SetViewOffset()
|
|
{
|
|
m_ViewOffset[0] = swxfregs.viewport.xOrig - 342;
|
|
m_ViewOffset[1] = swxfregs.viewport.yOrig - 342;
|
|
}
|
|
|
|
|
|
enum {
|
|
SKIP_FLAG = -1,
|
|
CLIP_POS_X_BIT = 0x01,
|
|
CLIP_NEG_X_BIT = 0x02,
|
|
CLIP_POS_Y_BIT = 0x04,
|
|
CLIP_NEG_Y_BIT = 0x08,
|
|
CLIP_POS_Z_BIT = 0x10,
|
|
CLIP_NEG_Z_BIT = 0x20
|
|
};
|
|
|
|
static inline int CalcClipMask(OutputVertexData *v)
|
|
{
|
|
int cmask = 0;
|
|
Vec4 pos = v->projectedPosition;
|
|
if (pos.w - pos.x < 0) cmask |= CLIP_POS_X_BIT;
|
|
if (pos.x + pos.w < 0) cmask |= CLIP_NEG_X_BIT;
|
|
if (pos.w - pos.y < 0) cmask |= CLIP_POS_Y_BIT;
|
|
if (pos.y + pos.w < 0) cmask |= CLIP_NEG_Y_BIT;
|
|
if (pos.w * pos.z > 0) cmask |= CLIP_POS_Z_BIT;
|
|
if (pos.z + pos.w < 0) cmask |= CLIP_NEG_Z_BIT;
|
|
return cmask;
|
|
}
|
|
|
|
static inline void AddInterpolatedVertex(float t, int out, int in, int& numVertices)
|
|
{
|
|
Vertices[numVertices]->Lerp(t, Vertices[out], Vertices[in]);
|
|
numVertices++;
|
|
}
|
|
|
|
#define DIFFERENT_SIGNS(x,y) ((x <= 0 && y > 0) || (x > 0 && y <= 0))
|
|
|
|
#define CLIP_DOTPROD(I, A, B, C, D) \
|
|
(Vertices[I]->projectedPosition.x * A + Vertices[I]->projectedPosition.y * B + Vertices[I]->projectedPosition.z * C + Vertices[I]->projectedPosition.w * D)
|
|
|
|
#define POLY_CLIP( PLANE_BIT, A, B, C, D ) \
|
|
{ \
|
|
if (mask & PLANE_BIT) { \
|
|
int idxPrev = inlist[0]; \
|
|
float dpPrev = CLIP_DOTPROD(idxPrev, A, B, C, D ); \
|
|
int outcount = 0; \
|
|
\
|
|
inlist[n] = inlist[0]; \
|
|
for (int j = 1; j <= n; j++) { \
|
|
int idx = inlist[j]; \
|
|
float dp = CLIP_DOTPROD(idx, A, B, C, D ); \
|
|
if (dpPrev >= 0) { \
|
|
outlist[outcount++] = idxPrev; \
|
|
} \
|
|
\
|
|
if (DIFFERENT_SIGNS(dp, dpPrev)) { \
|
|
if (dp < 0) { \
|
|
float t = dp / (dp - dpPrev); \
|
|
AddInterpolatedVertex(t, idx, idxPrev, numVertices); \
|
|
} else { \
|
|
float t = dpPrev / (dpPrev - dp); \
|
|
AddInterpolatedVertex(t, idxPrev, idx, numVertices); \
|
|
} \
|
|
outlist[outcount++] = numVertices - 1; \
|
|
} \
|
|
\
|
|
idxPrev = idx; \
|
|
dpPrev = dp; \
|
|
} \
|
|
\
|
|
if (outcount < 3) \
|
|
continue; \
|
|
\
|
|
{ \
|
|
int *tmp = inlist; \
|
|
inlist = outlist; \
|
|
outlist = tmp; \
|
|
n = outcount; \
|
|
} \
|
|
} \
|
|
}
|
|
|
|
#define LINE_CLIP(PLANE_BIT, A, B, C, D ) \
|
|
{ \
|
|
if (mask & PLANE_BIT) { \
|
|
const float dp0 = CLIP_DOTPROD( 0, A, B, C, D ); \
|
|
const float dp1 = CLIP_DOTPROD( 1, A, B, C, D ); \
|
|
const bool neg_dp0 = dp0 < 0; \
|
|
const bool neg_dp1 = dp1 < 0; \
|
|
\
|
|
if (neg_dp0 && neg_dp1) \
|
|
return; \
|
|
\
|
|
if (neg_dp1) { \
|
|
float t = dp1 / (dp1 - dp0); \
|
|
if (t > t1) t1 = t; \
|
|
} else if (neg_dp0) { \
|
|
float t = dp0 / (dp0 - dp1); \
|
|
if (t > t0) t0 = t; \
|
|
} \
|
|
} \
|
|
}
|
|
|
|
void ClipTriangle(int *indices, int &numIndices)
|
|
{
|
|
int mask = 0;
|
|
|
|
mask |= CalcClipMask(Vertices[0]);
|
|
mask |= CalcClipMask(Vertices[1]);
|
|
mask |= CalcClipMask(Vertices[2]);
|
|
|
|
if (mask != 0)
|
|
{
|
|
for (int i = 0; i < 3; i += 3)
|
|
{
|
|
int vlist[2][2*6+1];
|
|
int *inlist = vlist[0], *outlist = vlist[1];
|
|
int n = 3;
|
|
int numVertices = 3;
|
|
|
|
inlist[0] = 0;
|
|
inlist[1] = 1;
|
|
inlist[2] = 2;
|
|
|
|
// mark this triangle as unused in case it should be completely
|
|
// clipped
|
|
indices[0] = SKIP_FLAG;
|
|
indices[1] = SKIP_FLAG;
|
|
indices[2] = SKIP_FLAG;
|
|
|
|
POLY_CLIP(CLIP_POS_X_BIT, -1, 0, 0, 1);
|
|
POLY_CLIP(CLIP_NEG_X_BIT, 1, 0, 0, 1);
|
|
POLY_CLIP(CLIP_POS_Y_BIT, 0, -1, 0, 1);
|
|
POLY_CLIP(CLIP_NEG_Y_BIT, 0, 1, 0, 1);
|
|
POLY_CLIP(CLIP_POS_Z_BIT, 0, 0, 0, 1);
|
|
POLY_CLIP(CLIP_NEG_Z_BIT, 0, 0, 1, 1);
|
|
|
|
INCSTAT(swstats.thisFrame.numTrianglesClipped);
|
|
|
|
// transform the poly in inlist into triangles
|
|
indices[0] = inlist[0];
|
|
indices[1] = inlist[1];
|
|
indices[2] = inlist[2];
|
|
for (int j = 3; j < n; ++j) {
|
|
indices[numIndices++] = inlist[0];
|
|
indices[numIndices++] = inlist[j - 1];
|
|
indices[numIndices++] = inlist[j];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void ClipLine(int *indices)
|
|
{
|
|
int mask = 0;
|
|
int clip_mask[2] = { 0, 0 };
|
|
|
|
for (int i = 0; i < 2; ++i)
|
|
{
|
|
clip_mask[i] = CalcClipMask(Vertices[i]);
|
|
mask |= clip_mask[i];
|
|
}
|
|
|
|
if (mask == 0)
|
|
return;
|
|
|
|
float t0 = 0;
|
|
float t1 = 0;
|
|
|
|
// Mark unused in case of early termination
|
|
// of the macros below. (When fully clipped)
|
|
indices[0] = SKIP_FLAG;
|
|
indices[1] = SKIP_FLAG;
|
|
|
|
LINE_CLIP(CLIP_POS_X_BIT, -1, 0, 0, 1);
|
|
LINE_CLIP(CLIP_NEG_X_BIT, 1, 0, 0, 1);
|
|
LINE_CLIP(CLIP_POS_Y_BIT, 0, -1, 0, 1);
|
|
LINE_CLIP(CLIP_NEG_Y_BIT, 0, 1, 0, 1);
|
|
LINE_CLIP(CLIP_POS_Z_BIT, 0, 0, -1, 1);
|
|
LINE_CLIP(CLIP_NEG_Z_BIT, 0, 0, 1, 1);
|
|
|
|
// Restore the old values as this line
|
|
// was not fully clipped.
|
|
indices[0] = 0;
|
|
indices[1] = 1;
|
|
|
|
int numVertices = 2;
|
|
|
|
if (clip_mask[0])
|
|
{
|
|
indices[0] = numVertices;
|
|
AddInterpolatedVertex(t0, 0, 1, numVertices);
|
|
}
|
|
|
|
if (clip_mask[1])
|
|
{
|
|
indices[1] = numVertices;
|
|
AddInterpolatedVertex(t1, 1, 0, numVertices);
|
|
}
|
|
}
|
|
|
|
void ProcessTriangle(OutputVertexData *v0, OutputVertexData *v1, OutputVertexData *v2)
|
|
{
|
|
INCSTAT(swstats.thisFrame.numTrianglesIn)
|
|
|
|
bool backface;
|
|
|
|
if (!CullTest(v0, v1, v2, backface))
|
|
return;
|
|
|
|
int indices[NUM_INDICES] = { 0, 1, 2, SKIP_FLAG, SKIP_FLAG, SKIP_FLAG, SKIP_FLAG, SKIP_FLAG, SKIP_FLAG,
|
|
SKIP_FLAG, SKIP_FLAG, SKIP_FLAG, SKIP_FLAG, SKIP_FLAG, SKIP_FLAG,
|
|
SKIP_FLAG, SKIP_FLAG, SKIP_FLAG, SKIP_FLAG, SKIP_FLAG, SKIP_FLAG };
|
|
int numIndices = 3;
|
|
|
|
if (backface)
|
|
{
|
|
Vertices[0] = v0;
|
|
Vertices[1] = v2;
|
|
Vertices[2] = v1;
|
|
}
|
|
else
|
|
{
|
|
Vertices[0] = v0;
|
|
Vertices[1] = v1;
|
|
Vertices[2] = v2;
|
|
}
|
|
|
|
ClipTriangle(indices, numIndices);
|
|
|
|
for (int i = 0; i+3 <= numIndices; i+=3)
|
|
{
|
|
_assert_(i < NUM_INDICES);
|
|
if (indices[i] != SKIP_FLAG)
|
|
{
|
|
PerspectiveDivide(Vertices[indices[i]]);
|
|
PerspectiveDivide(Vertices[indices[i+1]]);
|
|
PerspectiveDivide(Vertices[indices[i+2]]);
|
|
|
|
Rasterizer::DrawTriangleFrontFace(Vertices[indices[i]], Vertices[indices[i+1]], Vertices[indices[i+2]]);
|
|
}
|
|
}
|
|
}
|
|
|
|
void CopyVertex(OutputVertexData *dst, OutputVertexData *src, float dx, float dy, unsigned int sOffset)
|
|
{
|
|
dst->screenPosition.x = src->screenPosition.x + dx;
|
|
dst->screenPosition.y = src->screenPosition.y + dy;
|
|
dst->screenPosition.z = src->screenPosition.z;
|
|
|
|
for (int i = 0; i < 3; ++i)
|
|
dst->normal[i] = src->normal[i];
|
|
|
|
for (int i = 0; i < 4; ++i)
|
|
dst->color[0][i] = src->color[0][i];
|
|
|
|
// todo - s offset
|
|
for (int i = 0; i < 8; ++i)
|
|
dst->texCoords[i] = src->texCoords[i];
|
|
}
|
|
|
|
void ProcessLine(OutputVertexData *lineV0, OutputVertexData *lineV1)
|
|
{
|
|
int indices[4] = { 0, 1, SKIP_FLAG, SKIP_FLAG };
|
|
|
|
Vertices[0] = lineV0;
|
|
Vertices[1] = lineV1;
|
|
|
|
// point to a valid vertex to store to when clipping
|
|
Vertices[2] = &ClippedVertices[17];
|
|
|
|
ClipLine(indices);
|
|
|
|
if (indices[0] != SKIP_FLAG)
|
|
{
|
|
OutputVertexData *v0 = Vertices[indices[0]];
|
|
OutputVertexData *v1 = Vertices[indices[1]];
|
|
|
|
PerspectiveDivide(v0);
|
|
PerspectiveDivide(v1);
|
|
|
|
float dx = v1->screenPosition.x - v0->screenPosition.x;
|
|
float dy = v1->screenPosition.y - v0->screenPosition.y;
|
|
|
|
float screenDx = 0;
|
|
float screenDy = 0;
|
|
|
|
if (fabsf(dx) > fabsf(dy))
|
|
{
|
|
if (dx > 0)
|
|
screenDy = bpmem.lineptwidth.linesize / -12.0f;
|
|
else
|
|
screenDy = bpmem.lineptwidth.linesize / 12.0f;
|
|
}
|
|
else
|
|
{
|
|
if (dy > 0)
|
|
screenDx = bpmem.lineptwidth.linesize / 12.0f;
|
|
else
|
|
screenDx = bpmem.lineptwidth.linesize / -12.0f;
|
|
}
|
|
|
|
OutputVertexData triangle[3];
|
|
|
|
CopyVertex(&triangle[0], v0, screenDx, screenDy, 0);
|
|
CopyVertex(&triangle[1], v1, screenDx, screenDy, 0);
|
|
CopyVertex(&triangle[2], v1, -screenDx, -screenDy, bpmem.lineptwidth.lineoff);
|
|
|
|
// ccw winding
|
|
Rasterizer::DrawTriangleFrontFace(&triangle[2], &triangle[1], &triangle[0]);
|
|
|
|
CopyVertex(&triangle[1], v0, -screenDx, -screenDy, bpmem.lineptwidth.lineoff);
|
|
|
|
Rasterizer::DrawTriangleFrontFace(&triangle[0], &triangle[1], &triangle[2]);
|
|
}
|
|
}
|
|
|
|
bool CullTest(OutputVertexData *v0, OutputVertexData *v1, OutputVertexData *v2, bool &backface)
|
|
{
|
|
int mask = CalcClipMask(v0);
|
|
mask &= CalcClipMask(v1);
|
|
mask &= CalcClipMask(v2);
|
|
|
|
if (mask)
|
|
{
|
|
INCSTAT(swstats.thisFrame.numTrianglesRejected)
|
|
return false;
|
|
}
|
|
|
|
float x0 = v0->projectedPosition.x;
|
|
float x1 = v1->projectedPosition.x;
|
|
float x2 = v2->projectedPosition.x;
|
|
float y1 = v1->projectedPosition.y;
|
|
float y0 = v0->projectedPosition.y;
|
|
float y2 = v2->projectedPosition.y;
|
|
float w0 = v0->projectedPosition.w;
|
|
float w1 = v1->projectedPosition.w;
|
|
float w2 = v2->projectedPosition.w;
|
|
|
|
float normalZDir = (x0*w2 - x2*w0)*y1 + (x2*y0 - x0*y2)*w1 + (y2*w0 - y0*w2)*x1;
|
|
|
|
backface = normalZDir <= 0.0f;
|
|
|
|
if ((bpmem.genMode.cullmode & 1) && !backface) // cull frontfacing
|
|
{
|
|
INCSTAT(swstats.thisFrame.numTrianglesCulled)
|
|
return false;
|
|
}
|
|
|
|
if ((bpmem.genMode.cullmode & 2) && backface) // cull backfacing
|
|
{
|
|
INCSTAT(swstats.thisFrame.numTrianglesCulled)
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void PerspectiveDivide(OutputVertexData *vertex)
|
|
{
|
|
Vec4 &projected = vertex->projectedPosition;
|
|
Vec3 &screen = vertex->screenPosition;
|
|
|
|
float wInverse = 1.0f/projected.w;
|
|
screen.x = projected.x * wInverse * swxfregs.viewport.wd + m_ViewOffset[0];
|
|
screen.y = projected.y * wInverse * swxfregs.viewport.ht + m_ViewOffset[1];
|
|
screen.z = projected.z * wInverse * swxfregs.viewport.zRange + swxfregs.viewport.farZ;
|
|
}
|
|
|
|
}
|