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windows-nt/Source/XPSP1/NT/multimedia/directx/dxg/ref8/tnl/clipping.cpp

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2020-09-26 03:20:57 -05:00
#include "pch.cpp"
#pragma hdrstop
#define GET_NEW_CLIP_VERTEX \
&clip_vertices[clip_vertices_used++];
//---------------------------------------------------------------------
inline void
InterpolateColor(RDClipVertex *out,
RDClipVertex *p1,
RDClipVertex *p2,
D3DVALUE num_denom )
{
FLOAT r1, g1, b1, a1;
FLOAT r2, g2, b2, a2;
r1 = p1->m_diffuse.r;
g1 = p1->m_diffuse.g;
b1 = p1->m_diffuse.b;
a1 = p1->m_diffuse.a;
r2 = p2->m_diffuse.r;
g2 = p2->m_diffuse.g;
b2 = p2->m_diffuse.b;
a2 = p2->m_diffuse.a;
out->m_diffuse.r = (r1 + (r2 - r1) * num_denom);
out->m_diffuse.g = (g1 + (g2 - g1) * num_denom);
out->m_diffuse.b = (b1 + (b2 - b1) * num_denom);
out->m_diffuse.a = (a1 + (a2 - a1) * num_denom);
}
//---------------------------------------------------------------------
inline void
InterpolateSpecular(RDClipVertex *out,
RDClipVertex *p1,
RDClipVertex *p2,
D3DVALUE num_denom )
{
FLOAT r1, g1, b1, a1;
FLOAT r2, g2, b2, a2;
r1 = p1->m_specular.r;
g1 = p1->m_specular.g;
b1 = p1->m_specular.b;
a1 = p1->m_specular.a;
r2 = p2->m_specular.r;
g2 = p2->m_specular.g;
b2 = p2->m_specular.b;
a2 = p2->m_specular.a;
out->m_specular.r = (r1 + (r2 - r1) * num_denom);
out->m_specular.g = (g1 + (g2 - g1) * num_denom);
out->m_specular.b = (b1 + (b2 - b1) * num_denom);
out->m_specular.a = (a1 + (a2 - a1) * num_denom);
}
//---------------------------------------------------------------------
// Inline texture coordinate difference.
__inline FLOAT
TextureDiff(FLOAT fTb, FLOAT fTa, INT iMode)
{
FLOAT fDiff1 = fTb - fTa;
if( iMode == 0 )
{
// Wrap not set, return plain difference.
return fDiff1;
}
else
{
FLOAT fDiff2;
// Wrap set, compute shortest distance of plain difference
// and wrap difference.
fDiff2 = fDiff1;
if( FLOAT_LTZ(fDiff1) )
{
fDiff2 += g_fOne;
}
else if( FLOAT_GTZ(fDiff1) )
{
fDiff2 -= g_fOne;
}
if( ABSF(fDiff1) < ABSF(fDiff2) )
{
return fDiff1;
}
else
{
return fDiff2;
}
}
}
//---------------------------------------------------------------------
inline D3DVALUE
InterpolateTexture(D3DVALUE t1,
D3DVALUE t2,
D3DVALUE num_denom,
DWORD bWrap)
{
if( !bWrap )
{
return ((t2 - t1) * num_denom + t1);
}
else
{
D3DVALUE t = (TextureDiff(t2, t1, 1) * num_denom + t1);
if( t > 1.0f ) t -= 1.0f;
return t;
}
}
//////////////////////////////////////////////////////////////////////////////
//
// RefClipper implementation
//
//////////////////////////////////////////////////////////////////////////////
const DWORD RefClipper::RCLIP_DIRTY_ZRANGE = (1 << 0);
const DWORD RefClipper::RCLIP_DIRTY_VIEWRECT = (1 << 1);
const DWORD RefClipper::RCLIP_DO_FLATSHADING = (1 << 2);
const DWORD RefClipper::RCLIP_DO_WIREFRAME = (1 << 3);
const DWORD RefClipper::RCLIP_DO_ADJUSTWRAP = (1 << 4);
const DWORD RefClipper::RCLIP_Z_ENABLE = (1 << 5);
RefClipper::RefClipper()
{
m_dwFlags = 0;
memset( &m_Viewport, 0, sizeof( m_Viewport) );
dvX = dvY = dvWidth = dvHeight = 0.0f;
scaleX = scaleY = scaleZ = 0.0f;
offsetX = offsetY = offsetZ = 0.0f;
scaleXi = scaleYi = scaleZi = 0.0f;
minX = minY = maxX = maxY = 0.0f;
minXgb = minYgb = maxXgb = maxYgb = 0.0f;
gb11 = gb22 = gb41 = gb42 = 0.0f;
Kgbx1 = Kgby1 = Kgbx2 = Kgby2 = 0.0f;
memset( clip_vbuf1, 0, sizeof(RDClipVertex*)*RD_MAX_CLIP_VERTICES );
memset( clip_vbuf2, 0, sizeof(RDClipVertex*)*RD_MAX_CLIP_VERTICES );
current_vbuf = 0;
memset( clip_vertices, 0, sizeof(RDClipVertex)*RD_MAX_CLIP_VERTICES );
m_dwInterpolate = 0;
clip_vertices_used = 0;
m_clipUnion = 0;
m_clipIntersection = 0;
// By default enable Guardband and set the extents equal
// to the default RefRast parameters
m_bUseGB = TRUE;
minXgb = (RD_GB_LEFT);
maxXgb = RD_GB_RIGHT;
minYgb = (RD_GB_TOP);
maxYgb = RD_GB_BOTTOM;
memset( m_userClipPlanes, 0, sizeof(RDVECTOR4)*RD_MAX_USER_CLIPPLANES );
#if DBG
DWORD v = 0;
// Guardband parameters
if( GetD3DRegValue(REG_DWORD, "DisableGB", &v, 4) && v != 0 )
{
m_bUseGB = FALSE;
}
// Try to get test values for the guard band
char value[80];
if( GetD3DRegValue(REG_SZ, "GuardBandLeft", &value, 80) &&
value[0] != 0 )
sscanf(value, "%f", &minXgb);
if( GetD3DRegValue(REG_SZ, "GuardBandRight", &value, 80) &&
value[0] != 0 )
sscanf(value, "%f", &maxXgb);
if( GetD3DRegValue(REG_SZ, "GuardBandTop", &value, 80) &&
value[0] != 0 )
sscanf(value, "%f", &minYgb);
if( GetD3DRegValue(REG_SZ, "GuardBandBottom", &value, 80) &&
value[0] != 0 )
sscanf(value, "%f", &maxYgb);
#endif // DBG
}
//---------------------------------------------------------------------
// RefClipper::UpdateViewData
// Updates View data used by ProcessVertices[VVM]
//---------------------------------------------------------------------
HRESULT
RefClipper::UpdateViewData()
{
HRESULT hr = D3D_OK;
// Update viewport information
if( m_dwFlags & RCLIP_DIRTY_ZRANGE )
{
scaleZ = m_Viewport.dvMaxZ - m_Viewport.dvMinZ;
offsetZ = m_Viewport.dvMinZ;
// ATTENTION: This could be a Divide by Zero here if
// the dvMaxZ == dvMinZ. Fix it later.
scaleZi = D3DVAL(1) / scaleZ;
}
if( m_dwFlags & RCLIP_DIRTY_VIEWRECT )
{
// Bail if we are going to cause any divide by zero exceptions.
// The likely reason is that we have a bogus viewport set by
// TLVertex execute buffer app.
if(m_Viewport.dwWidth == 0 || m_Viewport.dwHeight == 0 )
return DDERR_GENERIC;
dvX = D3DVAL(m_Viewport.dwX);
dvY = D3DVAL(m_Viewport.dwY);
dvWidth = D3DVAL(m_Viewport.dwWidth);
dvHeight = D3DVAL(m_Viewport.dwHeight);
// Coefficients to compute screen coordinates from normalized window
// coordinates
scaleX = dvWidth;
scaleY = - dvHeight;
offsetX = dvX;
offsetY = dvY + dvHeight;
#if 0
// Small offset is added to prevent generation of negative screen
// coordinates (this could happen because of precision errors).
// Not needed (or wanted) for devices which do guardband.
offsetX += SMALL_NUMBER;
offsetY += SMALL_NUMBER;
#endif
scaleXi = D3DVAL(1) / scaleX;
scaleYi = D3DVAL(1) / scaleY;
minX = dvX;
maxX = dvX + dvWidth;
minY = dvY;
maxY = dvY + dvHeight;
if( m_bUseGB )
{
// Because we clip by guard band window we have to use its extents
D3DVALUE w = 2.0f / dvWidth;
D3DVALUE h = 2.0f / dvHeight;
D3DVALUE ax1 = -(minXgb - dvX) * w + 1.0f;
D3DVALUE ax2 = (maxXgb - dvX) * w - 1.0f;
D3DVALUE ay1 = (maxYgb - dvY) * h - 1.0f;
D3DVALUE ay2 = -(minYgb - dvY) * h + 1.0f;
gb11 = 2.0f / (ax1 + ax2);
gb41 = gb11 * (ax1 - 1.0f) * 0.5f;
gb22 = 2.0f / (ay1 + ay2);
gb42 = gb22 * (ay1 - 1.0f) * 0.5f;
Kgbx1 = 0.5f * (1.0f - ax1);
Kgbx2 = 0.5f * (1.0f + ax2);
Kgby1 = 0.5f * (1.0f - ay1);
Kgby2 = 0.5f * (1.0f + ay2);
}
else
{
minXgb = minX;
maxXgb = maxX;
minYgb = minY;
maxYgb = maxY;
}
}
// Clear the dirty transform flags
m_dwFlags &= ~(RCLIP_DIRTY_VIEWRECT | RCLIP_DIRTY_ZRANGE);
return hr;
}
//---------------------------------------------------------------------
// Make clip vertex from RDVertex
//
// cv - clipVertex
// v - a TL vertex
// qwFVF - FVF of the input TL vertex
//---------------------------------------------------------------------
void
RefClipper::MakeClipVertexFromVertex( RDClipVertex& cv, RDVertex& v,
DWORD dwClipMask )
{
DWORD dwClipFlag = (DWORD) v.m_clip;
memcpy( &cv, &v, sizeof( RDVertex ) );
// If the clip flag for this vertex is set, that means that the
// transformation loop has not computed the screen coordinates for
// this vertex, it has simply stored the clip coordinates for this
// vertex
#if 0
if( v.m_clip & dwClipMask )
{
// This is a clipped vertex, simply no screen coordinates
cv.m_pos.x = D3DVALUE(0);
cv.m_pos.y = D3DVALUE(0);
cv.m_pos.z = D3DVALUE(0);
cv.m_rhw = D3DVALUE(0);
// Since this vertex has been clipped, the transformation loop
// has put in the clip coordinates instead
cv.hx = v.m_pos.x;
cv.hy = v.m_pos.y;
cv.hz = v.m_pos.z;
cv.hw = v.m_rhw;
}
else
{
// This vertex is not clipped, so its screen coordinates have been
// computed
// Transform the screen coordinate back to the clipping space
cv.hw = 1.0f / cv.m_rhw;
cv.hx = (cv.m_pos.x - offsetX) * cv.hw * scaleXi;
cv.hy = (cv.m_pos.y - offsetY) * cv.hw * scaleYi;
cv.hz = (cv.m_pos.z - offsetZ) * cv.hw * scaleZi;
}
#endif
}
//---------------------------------------------------------------------
// RefVP::ComputeClipCodes
//---------------------------------------------------------------------
RDCLIPCODE
RefClipper::ComputeClipCodes(RDCLIPCODE* pclipIntersection,
RDCLIPCODE* pclipUnion,
FLOAT x_clip, FLOAT y_clip,
FLOAT z_clip, FLOAT w_clip)
{
D3DVALUE xx = w_clip - x_clip;
D3DVALUE yy = w_clip - y_clip;
D3DVALUE zz = w_clip - z_clip;
// if( x < 0 ) clip |= RDCLIP_LEFTBIT;
// if( x >= we ) clip |= RDCLIP_RIGHTBIT;
// if( y < 0 ) clip |= RDCLIP_BOTTOMBIT;
// if( y >= we ) clip |= RDCLIP_TOPBIT;
// if( z < 0 ) clip |= RDCLIP_FRONTBIT;
// if( z >= we ) clip |= RDCLIP_BACKBIT;
RDCLIPCODE clip =
((AS_INT32(x_clip) & 0x80000000) >> (32-RDCLIP_LEFTBIT)) |
((AS_INT32(y_clip) & 0x80000000) >> (32-RDCLIP_BOTTOMBIT))|
((AS_INT32(z_clip) & 0x80000000) >> (32-RDCLIP_FRONTBIT)) |
((AS_INT32(xx) & 0x80000000) >> (32-RDCLIP_RIGHTBIT)) |
((AS_INT32(yy) & 0x80000000) >> (32-RDCLIP_TOPBIT)) |
((AS_INT32(zz) & 0x80000000) >> (32-RDCLIP_BACKBIT));
RDCLIPCODE clipBit = RDCLIP_USERCLIPPLANE0;
for( DWORD j=0; j<RD_MAX_USER_CLIPPLANES; j++)
{
if( m_xfmUserClipPlanes[j].bActive )
{
RDVECTOR4& plane = m_xfmUserClipPlanes[j].plane;
FLOAT fComp = 0.0f;
if( (x_clip*plane.x +
y_clip*plane.y +
z_clip*plane.z +
w_clip*plane.w) < fComp )
{
clip |= clipBit;
}
}
clipBit <<= 1;
}
if( clip == 0 )
{
*pclipIntersection = 0;
return clip;
}
else
{
if( m_bUseGB )
{
// We do guardband check in the projection space, so
// we transform X and Y of the vertex there
D3DVALUE xnew = x_clip * gb11 +
w_clip * gb41;
D3DVALUE ynew = y_clip * gb22 +
w_clip * gb42;
D3DVALUE xx = w_clip - xnew;
D3DVALUE yy = w_clip - ynew;
clip |= ((AS_INT32(xnew) & 0x80000000) >> (32-RDCLIPGB_LEFTBIT)) |
((AS_INT32(ynew) & 0x80000000) >> (32-RDCLIPGB_BOTTOMBIT)) |
((AS_INT32(xx) & 0x80000000) >> (32-RDCLIPGB_RIGHTBIT)) |
((AS_INT32(yy) & 0x80000000) >> (32-RDCLIPGB_TOPBIT));
}
*pclipIntersection &= clip;
*pclipUnion |= clip;
return clip;
}
}
//---------------------------------------------------------------------
// RefVP::ComputeClipCodesTL
//---------------------------------------------------------------------
void
RefClipper::ComputeClipCodesTL( RDVertex* pVtx )
{
FLOAT x, y, z;
DWORD clip = 0;
_ASSERT( FVF_TRANSFORMED( pVtx->m_qwFVF ),
"Can compute clipcodes only for Transformed vertices." );
DWORD clipZF = (m_dwFlags & RCLIP_Z_ENABLE) ? RDCLIP_FRONT : 0;
DWORD clipZB = (m_dwFlags & RCLIP_Z_ENABLE) ? RDCLIP_BACK : 0;
// Invert to compenstate for the sign during the
// divide by w.
if( pVtx->m_rhw < 0 )
{
x = -pVtx->m_pos.x;
y = -pVtx->m_pos.y;
z = -pVtx->m_pos.z;
}
else
{
x = pVtx->m_pos.x;
y = pVtx->m_pos.y;
z = pVtx->m_pos.z;
}
if( x < minX )
clip |= RDCLIP_LEFT;
else if( x >= maxX )
clip |= RDCLIP_RIGHT;
if (y < minY)
clip |= RDCLIP_TOP;
else if (y >= maxY)
clip |= RDCLIP_BOTTOM;
if (z < 0.0f)
clip |= clipZF;
else if (z >= 1.0f)
clip |= clipZB;
if( m_bUseGB )
{
if( x < minXgb )
clip |= RDCLIPGB_LEFT;
else if( x >= maxXgb )
clip |= RDCLIPGB_RIGHT;
if( y < minYgb )
clip |= RDCLIPGB_TOP;
else if( y >= maxYgb )
clip |= RDCLIPGB_BOTTOM;
}
pVtx->m_clip = clip;
// Back transform to obtain the clip-coordinates
pVtx->m_clip_w = 1.0f / pVtx->m_rhw; // This is w_clip
pVtx->m_clip_x = (pVtx->m_pos.x - offsetX) * pVtx->m_clip_w * scaleXi;
pVtx->m_clip_y = (pVtx->m_pos.y - offsetY) * pVtx->m_clip_w * scaleYi;
pVtx->m_clip_z = (pVtx->m_pos.z - offsetZ) * pVtx->m_clip_w * scaleZi;
return;
}
//---------------------------------------------------------------------
// Clipping a triangle by a plane
//
// Returns number of vertices in the clipped triangle
//---------------------------------------------------------------------
int
RefClipper::ClipByPlane( RDClipVertex **inv, RDClipVertex **outv,
RDVECTOR4 *plane, DWORD dwClipFlag, int count )
{
int i;
int out_count = 0;
RDClipVertex *curr, *prev;
D3DVALUE curr_inside;
D3DVALUE prev_inside;
prev = inv[count-1];
curr = *inv++;
prev_inside = prev->m_clip_x*plane->x + prev->m_clip_y*plane->y +
prev->m_clip_z*plane->z + prev->m_clip_w*plane->w;
for (i = count; i; i--)
{
curr_inside = curr->m_clip_x*plane->x + curr->m_clip_y*plane->y +
curr->m_clip_z*plane->z + curr->m_clip_w*plane->w;
// We interpolate always from the inside vertex to the outside vertex
// to reduce precision problems
if( FLOAT_LTZ(prev_inside) )
{ // first point is outside
if( FLOAT_GEZ(curr_inside) )
{ // second point is inside
// Find intersection and insert in into the output buffer
outv[out_count] = GET_NEW_CLIP_VERTEX;
outv[out_count]->m_qwFVF = prev->m_qwFVF;
Interpolate( outv[out_count],
curr, prev,
(prev->m_clip & CLIPPED_ENABLE) | dwClipFlag,
curr_inside, curr_inside - prev_inside);
out_count++;
}
} else
{ // first point is inside - put it to the output buffer first
outv[out_count++] = prev;
if( FLOAT_LTZ(curr_inside) )
{ // second point is outside
// Find intersection and put it to the output buffer
outv[out_count] = GET_NEW_CLIP_VERTEX;
outv[out_count]->m_qwFVF = prev->m_qwFVF;
Interpolate( outv[out_count],
prev, curr,
dwClipFlag,
prev_inside, prev_inside - curr_inside);
out_count++;
}
}
prev = curr;
curr = *inv++;
prev_inside = curr_inside;
}
return out_count;
}
//-------------------------------------------------------------------------
// Clips a line by a plane
//
// Returns 1 if the line is outside the frustum, 0 otherwise
//
int
RefClipper::ClipLineByPlane( RDCLIPTRIANGLE *line, RDVECTOR4 *plane,
DWORD dwClipBit )
{
D3DVALUE in1, in2;
RDClipVertex outv;
in1 = line->v[0]->m_clip_x * plane->x +
line->v[0]->m_clip_y * plane->y +
line->v[0]->m_clip_z * plane->z +
line->v[0]->m_clip_w * plane->w;
in2 = line->v[1]->m_clip_x * plane->x +
line->v[1]->m_clip_y * plane->y +
line->v[1]->m_clip_z * plane->z +
line->v[1]->m_clip_w * plane->w;
if( in1 < 0 )
{
if( in2 < 0 )
return 1;
Interpolate( &outv, line->v[0], line->v[1],
dwClipBit, in1, in1 - in2);
*line->v[0] = outv;
}
else
{
if( in2 < 0 )
{
Interpolate( &outv, line->v[0], line->v[1],
dwClipBit, in1, in1 - in2);
*line->v[1] = outv;
}
}
return 0;
}
/*------------------------------------------------------------------------
* Calculate the screen coords for any new vertices
* introduced into the polygon.
*/
void
RefClipper::ComputeScreenCoordinates( RDClipVertex **inv, int count )
{
int i;
for (i = 0; i < count; i++)
{
RDClipVertex *p;
p = inv[i];
//
// Catch any vertices that need screen co-ordinates generated.
// There are two possibilities
// 1) Vertices generated during interpolation
// 2) Vertices marked for clipping by the transform but
// not clipped here due to the finite precision
// of the floating point unit.
//
if( p->m_clip & ~CLIPPED_ENABLE )
{
D3DVALUE inv_w;
inv_w = D3DVAL(1.0)/p->m_clip_w;
switch ((int)p->m_clip & (CLIPPED_LEFT|CLIPPED_RIGHT))
{
case CLIPPED_LEFT: p->m_pos.x = minXgb; break;
case CLIPPED_RIGHT: p->m_pos.x = maxXgb; break;
default:
p->m_pos.x = p->m_clip_x * scaleX * inv_w + offsetX;
if( p->m_pos.x < minXgb )
p->m_pos.x = minXgb;
if( p->m_pos.x > maxXgb )
p->m_pos.x = maxXgb;
}
switch ((int)p->m_clip & (CLIPPED_TOP|CLIPPED_BOTTOM))
{
case CLIPPED_BOTTOM: p->m_pos.y = maxYgb; break;
case CLIPPED_TOP: p->m_pos.y = minYgb; break;
default:
p->m_pos.y = p->m_clip_y * scaleY * inv_w + offsetY;
if( p->m_pos.y < minYgb )
p->m_pos.y = minYgb;
if( p->m_pos.y > maxYgb )
p->m_pos.y = maxYgb;
}
p->m_pos.z = p->m_clip_z * scaleZ * inv_w + offsetZ;
p->m_rhw = inv_w;
}
}
}
//---------------------------------------------------------------------
void
RefClipper::Interpolate( RDClipVertex *out, RDClipVertex *p1, RDClipVertex *p2,
int code, D3DVALUE num, D3DVALUE denom )
{
DWORD dwInterpolate = m_dwInterpolate;
D3DVALUE num_denom = num / denom;
out->m_clip = (((int)p1->m_clip & (int)p2->m_clip) & ~CLIPPED_ENABLE) | code;
out->m_clip_x = p1->m_clip_x + (p2->m_clip_x - p1->m_clip_x) * num_denom;
out->m_clip_y = p1->m_clip_y + (p2->m_clip_y - p1->m_clip_y) * num_denom;
out->m_clip_z = p1->m_clip_z + (p2->m_clip_z - p1->m_clip_z) * num_denom;
out->m_clip_w = p1->m_clip_w + (p2->m_clip_w - p1->m_clip_w) * num_denom;
out->m_diffuse = clip_color;
out->m_specular = clip_specular;
/*
* Interpolate any other color model or quality dependent values.
*/
if( dwInterpolate & RDCLIP_INTERPOLATE_COLOR )
{
InterpolateColor(out, p1, p2, num_denom);
}
if( dwInterpolate & RDCLIP_INTERPOLATE_SPECULAR )
{
InterpolateSpecular(out, p1, p2, num_denom);
}
if( dwInterpolate & RDCLIP_INTERPOLATE_TEXTURE )
{
UINT64 qwFVF = p1->m_qwFVF;
// Assume that D3DRENDERSTATE_WRAPi are sequential
DWORD numTex = FVF_TEXCOORD_NUMBER(qwFVF);
for (DWORD i = 0; i < numTex; i++)
{
FLOAT* pTexture1 = (FLOAT *)&p1->m_tex[i];
FLOAT* pTexture2 = (FLOAT *)&p2->m_tex[i];
FLOAT* pTexture = (FLOAT *)&out->m_tex[i];
DWORD wrapState;
if( m_dwFlags & RCLIP_DO_ADJUSTWRAP )
{
DWORD TCI = m_pDev->GetTSS(i)[D3DTSS_TEXCOORDINDEX] & 0xffff;
wrapState = m_pDev->GetRS()[D3DRENDERSTATE_WRAP0 + TCI];
}
else
{
wrapState = m_pDev->GetRS()[D3DRENDERSTATE_WRAP0 + i];
}
DWORD n = GetTexCoordDim(qwFVF, i);
// DWORD n = (DWORD)(m_dwTexCoordSizeArray[i] >> 2);
DWORD dwWrapBit = 1;
for (DWORD j=0; j < n; j++)
{
pTexture[j] = InterpolateTexture(pTexture1[j], pTexture2[j],
num_denom,
wrapState & dwWrapBit);
dwWrapBit <<= 1;
}
}
}
if( dwInterpolate & RDCLIP_INTERPOLATE_S )
{
out->m_pointsize = p1->m_pointsize +
(p2->m_pointsize - p1->m_pointsize) * num_denom;
}
if( dwInterpolate & RDCLIP_INTERPOLATE_FOG )
{
out->m_fog = p1->m_fog + (p2->m_fog - p1->m_fog) * num_denom;
}
}
//------------------------------------------------------------------------------
// Functions for clipping by frustum window
//
#define __CLIP_NAME ClipLeft
#define __CLIP_LINE_NAME ClipLineLeft
#define __CLIP_FLAG CLIPPED_LEFT
#define __CLIP_COORD m_clip_x
#include "clip.h"
#define __CLIP_NAME ClipRight
#define __CLIP_LINE_NAME ClipLineRight
#define __CLIP_W
#define __CLIP_FLAG CLIPPED_RIGHT
#define __CLIP_COORD m_clip_x
#include "clip.h"
#define __CLIP_NAME ClipBottom
#define __CLIP_LINE_NAME ClipLineBottom
#define __CLIP_FLAG CLIPPED_BOTTOM
#define __CLIP_COORD m_clip_y
#include "clip.h"
#define __CLIP_NAME ClipTop
#define __CLIP_LINE_NAME ClipLineTop
#define __CLIP_W
#define __CLIP_FLAG CLIPPED_TOP
#define __CLIP_COORD m_clip_y
#include "clip.h"
#define __CLIP_NAME ClipBack
#define __CLIP_LINE_NAME ClipLineBack
#define __CLIP_W
#define __CLIP_FLAG CLIPPED_BACK
#define __CLIP_COORD m_clip_z
#include "clip.h"
#define __CLIP_NAME ClipFront
#define __CLIP_LINE_NAME ClipLineFront
#define __CLIP_FLAG CLIPPED_FRONT
#define __CLIP_COORD m_clip_z
#include "clip.h"
//------------------------------------------------------------------------------
// Functions for guard band clipping
//
#define __CLIP_GUARDBAND
#define __CLIP_NAME ClipLeftGB
#define __CLIP_LINE_NAME ClipLineLeftGB
#define __CLIP_FLAG CLIPPED_LEFT
#define __CLIP_COORD m_clip_x
#define __CLIP_SIGN -
#define __CLIP_GBCOEF Kgbx1
#include "clip.h"
#define __CLIP_NAME ClipRightGB
#define __CLIP_LINE_NAME ClipLineRightGB
#define __CLIP_FLAG CLIPPED_RIGHT
#define __CLIP_COORD m_clip_x
#define __CLIP_GBCOEF Kgbx2
#define __CLIP_SIGN +
#include "clip.h"
#define __CLIP_NAME ClipBottomGB
#define __CLIP_LINE_NAME ClipLineBottomGB
#define __CLIP_FLAG CLIPPED_BOTTOM
#define __CLIP_COORD m_clip_y
#define __CLIP_SIGN -
#define __CLIP_GBCOEF Kgby1
#include "clip.h"
#define __CLIP_NAME ClipTopGB
#define __CLIP_LINE_NAME ClipLineTopGB
#define __CLIP_FLAG CLIPPED_TOP
#define __CLIP_COORD m_clip_y
#define __CLIP_GBCOEF Kgby2
#define __CLIP_SIGN +
#include "clip.h"
#undef __CLIP_GUARDBAND
//---------------------------------------------------------------------
inline DWORD
ComputeClipCodeUserPlanes( RDUSERCLIPPLANE *UserPlanes, RDClipVertex *p)
{
DWORD clip = 0;
DWORD dwClipBit = RDCLIP_USERCLIPPLANE0;
for( DWORD j=0; j<RD_MAX_USER_CLIPPLANES; j++)
{
if( UserPlanes[j].bActive )
{
RDVECTOR4& plane = UserPlanes[j].plane;
if( (p->m_clip_x*plane.x +
p->m_clip_y*plane.y +
p->m_clip_z*plane.z +
p->m_clip_w*plane.w) < 0 )
{
clip |= dwClipBit;
}
}
dwClipBit <<= 1;
}
return clip;
}
//---------------------------------------------------------------------
inline DWORD
RefClipper::ComputeClipCodeGB( RDClipVertex *p )
{
DWORD clip = 0;
if( p->m_clip_x < p->m_clip_w * Kgbx1 )
clip |= RDCLIPGB_LEFT;
if( p->m_clip_x > p->m_clip_w * Kgbx2 )
clip |= RDCLIPGB_RIGHT;
if( p->m_clip_y < p->m_clip_w * Kgby1 )
clip |= RDCLIPGB_BOTTOM;
if( p->m_clip_y > p->m_clip_w * Kgby2 )
clip |= RDCLIPGB_TOP;
if( p->m_clip_z > p->m_clip_w )
clip |= RDCLIP_BACK;
clip |= ComputeClipCodeUserPlanes( m_xfmUserClipPlanes, p );
p->m_clip = (p->m_clip & (CLIPPED_ENABLE | CLIPPED_FRONT)) | clip;
return clip;
}
//---------------------------------------------------------------------
inline DWORD
RefClipper::ComputeClipCode( RDClipVertex *p )
{
DWORD clip = 0;
if( FLOAT_LTZ(p->m_clip_x) )
clip |= RDCLIP_LEFT;
if( p->m_clip_x > p->m_clip_w )
clip |= RDCLIP_RIGHT;
if( FLOAT_LTZ(p->m_clip_y) )
clip |= RDCLIP_BOTTOM;
if( p->m_clip_y > p->m_clip_w )
clip |= RDCLIP_TOP;
if( p->m_clip_z > p->m_clip_w )
clip |= RDCLIP_BACK;
clip |= ComputeClipCodeUserPlanes( m_xfmUserClipPlanes, p );
p->m_clip = (p->m_clip & (CLIPPED_ENABLE | CLIPPED_FRONT)) | clip;
return clip;
}
//---------------------------------------------------------------------
// RefDev::UpdateClipper
// Updates clipping data used by ProcessVertices
// BOOL bProgrammablePipeLine: If this is true, it means that the
// programmable vertex machine is invoking
// this method.
//---------------------------------------------------------------------
HRESULT
RefDev::UpdateClipper()
{
HRESULT hr = D3D_OK;
HR_RET( m_Clipper.UpdateViewData() );
DWORD dwClipPlanesEnable =
GetRS()[D3DRENDERSTATE_CLIPPLANEENABLE];
if( !GetRS()[D3DRENDERSTATE_CLIPPING] )
return S_OK;
m_Clipper.m_dwFlags &= ~RefClipper::RCLIP_DO_ADJUSTWRAP;
if( (m_RefVP.m_dwTLState & (RDPV_DOTEXXFORM | RDPV_DOTEXGEN)) &&
m_pCurrentVShader->IsFixedFunction() )
m_Clipper.m_dwFlags |= RefClipper::RCLIP_DO_ADJUSTWRAP;
// Figure out which pieces need to be interpolated in new vertices.
m_Clipper.m_dwInterpolate = 0;
if( GetRS()[D3DRENDERSTATE_SHADEMODE] == D3DSHADE_GOURAUD )
{
m_Clipper.m_dwInterpolate |= RDCLIP_INTERPOLATE_COLOR;
if( m_qwFVFOut & D3DFVF_SPECULAR )
{
m_Clipper.m_dwInterpolate |= RDCLIP_INTERPOLATE_SPECULAR;
}
}
// if( GetRS()[D3DRENDERSTATE_FOGENABLE] )
if( m_qwFVFOut & D3DFVFP_FOG )
{
m_Clipper.m_dwInterpolate |= RDCLIP_INTERPOLATE_FOG;
}
if( FVF_TEXCOORD_NUMBER(m_qwFVFOut) != 0 )
{
m_Clipper.m_dwInterpolate |= RDCLIP_INTERPOLATE_TEXTURE;
}
if( m_qwFVFOut & D3DFVF_PSIZE ) // m_primType == D3DPT_POINTLIST
{
m_Clipper.m_dwInterpolate |= RDCLIP_INTERPOLATE_S;
}
// Clear clip union and intersection flags
m_Clipper.m_clipIntersection = 0;
m_Clipper.m_clipUnion = 0;
// The matrix to transform user clip planes depends on whether it is a
// fixed function pipeline or a programmable pipeline.
// Programmable pipeline: the clip-planes are transformed by the
// Inverse(Mshift) to adjust for clipping in the clipper. The user is
// assumed to have pre-transformed the clip-planes to the clipping
// space.
// Fixed function pipeline: the clip-planes are transformed to the clipping
// space by the Inverse(Mview * Mproj * Mshift).
RDMATRIX* pUserClipPlaneMatrix = NULL;
RDMATRIX matProgPipe =
{
2, 0, 0, 0,
0, 2, 0, 0,
0, 0, 1, 0,
-1,-1, 0, 1
};
if( m_pCurrentVShader->IsFixedFunction() )
{
pUserClipPlaneMatrix = &(m_RefVP.m_TransformData.m_VPSInv);
}
else
{
pUserClipPlaneMatrix = &matProgPipe;
}
// Update the user defined clip plane data
for( DWORD i=0; i<RD_MAX_USER_CLIPPLANES; i++ )
{
// Figure out if it is active
m_Clipper.m_xfmUserClipPlanes[i].bActive =
(BOOL)(dwClipPlanesEnable & 0x1);
dwClipPlanesEnable >>= 1;
// If it is active, transform it into eye-space using the
// view transform. The clip planes are defined in the
// world space.
if( m_Clipper.m_xfmUserClipPlanes[i].bActive )
{
XformPlaneBy4x4Transposed( &(m_Clipper.m_userClipPlanes[i]),
pUserClipPlaneMatrix,
&(m_Clipper.m_xfmUserClipPlanes[i].plane) );
}
}
return hr;
}
//----------------------------------------------------------------------------
//
// DrawOnePrimitive
//
// Draw one clipped primitive.
//
//----------------------------------------------------------------------------
HRESULT
RefClipper::DrawOnePrimitive( GArrayT<RDVertex>& VtxArray,
DWORD dwStartVertex,
D3DPRIMITIVETYPE PrimType,
UINT cVertices )
{
INT i;
RDVertex* pV0;
RDVertex* pV1;
RDVertex* pV2;
HRESULT hr;
DWORD dwCurrVtx = dwStartVertex;
switch( PrimType )
{
case D3DPT_POINTLIST:
for (i = 0; i < (INT)cVertices; i++)
{
DrawPoint(&VtxArray[i]);
}
break;
case D3DPT_LINELIST:
for (i = (INT)cVertices / 2; i > 0; i--)
{
pV0 = &VtxArray[dwCurrVtx++];
pV1 = &VtxArray[dwCurrVtx++];
DrawLine(pV0, pV1);
}
break;
case D3DPT_LINESTRIP:
{
pV1 = &VtxArray[dwCurrVtx];
// Disable last-pixel setting for shared verties and store prestate.
m_pDev->StoreLastPixelState(TRUE);
// Initial pV0.
for (i = (INT)cVertices - 1; i > 1; i--)
{
pV0 = pV1;
dwCurrVtx++;
pV1 = &VtxArray[dwCurrVtx];
DrawLine(pV0, pV1);
}
// Restore last-pixel setting.
m_pDev->StoreLastPixelState(FALSE);
// Draw last line with last-pixel setting from state.
if( i == 1 )
{
dwCurrVtx++;
pV0 = &VtxArray[dwCurrVtx];
DrawLine(pV1, pV0);
}
}
break;
case D3DPT_TRIANGLELIST:
for (i = (INT)cVertices; i > 0; i -= 3)
{
pV0 = &VtxArray[dwCurrVtx++];
pV1 = &VtxArray[dwCurrVtx++];
pV2 = &VtxArray[dwCurrVtx++];
DrawTriangle(pV0, pV1, pV2);
}
break;
case D3DPT_TRIANGLESTRIP:
{
// Get initial vertex values.
pV1 = &VtxArray[dwCurrVtx++];
pV2 = &VtxArray[dwCurrVtx++];
for (i = (INT)cVertices - 2; i > 1; i -= 2)
{
pV0 = pV1;
pV1 = pV2;
pV2 = &VtxArray[dwCurrVtx++];
DrawTriangle(pV0, pV1, pV2);
pV0 = pV1;
pV1 = pV2;
pV2 = &VtxArray[dwCurrVtx++];
DrawTriangle(pV0, pV2, pV1);
}
if( i > 0 )
{
pV0 = pV1;
pV1 = pV2;
pV2 = &VtxArray[dwCurrVtx];
DrawTriangle(pV0, pV1, pV2);
}
}
break;
case D3DPT_TRIANGLEFAN:
{
RDCLIPCODE c0, c1, c2;
pV2 = &VtxArray[dwCurrVtx++];
// Preload initial pV0.
pV1 = &VtxArray[dwCurrVtx++];
for (i = (INT)cVertices - 2; i > 0; i--)
{
pV0 = pV1;
pV1 = &VtxArray[dwCurrVtx++];
DrawTriangle(pV0, pV1, pV2);
}
}
break;
default:
DPFERR("Refrast Error: Unknown or unsupported primitive type "
"requested of DrawOnePrimitive");
return DDERR_INVALIDPARAMS;
}
return D3D_OK;
}
//----------------------------------------------------------------------------
//
// DrawOneIndexedPrimitive
//
// Draw one list of clipped indexed primitives.
//
//----------------------------------------------------------------------------
HRESULT
RefClipper::DrawOneIndexedPrimitive( GArrayT<RDVertex>& VtxArray,
int StartVertexIndex,
LPWORD pIndices,
DWORD StartIndex,
UINT cIndices,
D3DPRIMITIVETYPE PrimType )
{
INT i;
RDVertex* pV0;
RDVertex* pV1;
RDVertex* pV2;
LPWORD puIndices = pIndices + StartIndex;
DWORD dwCurrIndex;
HRESULT hr;
switch( PrimType )
{
case D3DPT_POINTLIST:
for (i = (INT)cIndices; i > 0; i--)
{
pV0 = &VtxArray[StartVertexIndex + *puIndices++];
DrawPoint( pV0 );
}
break;
case D3DPT_LINELIST:
for (i = (INT)cIndices / 2; i > 0; i--)
{
pV0 = &VtxArray[StartVertexIndex + *puIndices++];
pV1 = &VtxArray[StartVertexIndex + *puIndices++];
DrawLine(pV0, pV1);
}
break;
case D3DPT_LINESTRIP:
{
// Disable last-pixel setting for shared verties and store prestate.
m_pDev->StoreLastPixelState(TRUE);
// Initial pV1.
pV1 = &VtxArray[StartVertexIndex + *puIndices++];
for (i = (INT)cIndices - 1; i > 1; i--)
{
pV0 = pV1;
pV1 = &VtxArray[StartVertexIndex + *puIndices++];
DrawLine(pV0, pV1);
}
// Restore last-pixel setting.
m_pDev->StoreLastPixelState(FALSE);
// Draw last line with last-pixel setting from state.
if( i == 1 )
{
pV0 = &VtxArray[StartVertexIndex + *puIndices];
DrawLine(pV1, pV0);
}
}
break;
case D3DPT_TRIANGLELIST:
for (i = (INT)cIndices; i > 0; i -= 3)
{
pV0 = &VtxArray[StartVertexIndex + *puIndices++];
pV1 = &VtxArray[StartVertexIndex + *puIndices++];
pV2 = &VtxArray[StartVertexIndex + *puIndices++];
DrawTriangle(pV0, pV1, pV2);
}
break;
case D3DPT_TRIANGLESTRIP:
{
// Get initial vertex values.
pV1 = &VtxArray[StartVertexIndex + *puIndices++];
pV2 = &VtxArray[StartVertexIndex + *puIndices++];
for (i = (INT)cIndices - 2; i > 1; i -= 2)
{
pV0 = pV1;
pV1 = pV2;
pV2 = &VtxArray[StartVertexIndex + *puIndices++];
DrawTriangle(pV0, pV1, pV2);
pV0 = pV1;
pV1 = pV2;
pV2 = &VtxArray[StartVertexIndex + *puIndices++];
DrawTriangle(pV0, pV2, pV1);
}
if( i > 0 )
{
pV0 = pV1;
pV1 = pV2;
pV2 = &VtxArray[StartVertexIndex + *puIndices++];
DrawTriangle(pV0, pV1, pV2);
}
}
break;
case D3DPT_TRIANGLEFAN:
{
pV2 = &VtxArray[StartVertexIndex + *puIndices++];
// Preload initial pV0.
pV1 = &VtxArray[StartVertexIndex + *puIndices++];
for (i = (INT)cIndices - 2; i > 0; i--)
{
pV0 = pV1;
pV1 = &VtxArray[StartVertexIndex + *puIndices++];
DrawTriangle(pV0, pV1, pV2);
}
}
break;
default:
DPFERR("Refrast Error: Unknown or unsupported primitive type "
"requested of DrawOneIndexedPrimitive");
return DDERR_INVALIDPARAMS;
}
return D3D_OK;
}
HRESULT
RefClipper::DrawOneIndexedPrimitive( GArrayT<RDVertex>& VtxArray,
int StartVertexIndex,
LPDWORD pIndices,
DWORD StartIndex,
UINT cIndices,
D3DPRIMITIVETYPE PrimType )
{
INT i;
RDVertex* pV0;
RDVertex* pV1;
RDVertex* pV2;
LPDWORD puIndices = pIndices + StartIndex;
HRESULT hr;
switch( PrimType )
{
case D3DPT_POINTLIST:
for (i = (INT)cIndices; i > 0; i--)
{
pV0 = &VtxArray[StartVertexIndex + *puIndices++];
DrawPoint(pV0);
}
break;
case D3DPT_LINELIST:
for (i = (INT)cIndices / 2; i > 0; i--)
{
pV0 = &VtxArray[StartVertexIndex + *puIndices++];
pV1 = &VtxArray[StartVertexIndex + *puIndices++];
DrawLine(pV0, pV1);
}
break;
case D3DPT_LINESTRIP:
{
// Disable last-pixel setting for shared verties and store prestate.
m_pDev->StoreLastPixelState(TRUE);
// Initial pV1.
pV1 = &VtxArray[StartVertexIndex + *puIndices++];
for (i = (INT)cIndices - 1; i > 1; i--)
{
pV0 = pV1;
pV1 = &VtxArray[StartVertexIndex + *puIndices++];
DrawLine(pV0, pV1);
}
// Restore last-pixel setting.
m_pDev->StoreLastPixelState(FALSE);
// Draw last line with last-pixel setting from state.
if( i == 1 )
{
pV0 = &VtxArray[StartVertexIndex + *puIndices];
DrawLine(pV1, pV0);
}
}
break;
case D3DPT_TRIANGLELIST:
for (i = (INT)cIndices; i > 0; i -= 3)
{
pV0 = &VtxArray[StartVertexIndex + *puIndices++];
pV1 = &VtxArray[StartVertexIndex + *puIndices++];
pV2 = &VtxArray[StartVertexIndex + *puIndices++];
DrawTriangle(pV0, pV1, pV2);
}
break;
case D3DPT_TRIANGLESTRIP:
{
// Get initial vertex values.
pV1 = &VtxArray[StartVertexIndex + *puIndices++];
pV2 = &VtxArray[StartVertexIndex + *puIndices++];
for (i = (INT)cIndices - 2; i > 1; i -= 2)
{
pV0 = pV1;
pV1 = pV2;
pV2 = &VtxArray[StartVertexIndex + *puIndices++];
DrawTriangle(pV0, pV1, pV2);
pV0 = pV1;
pV1 = pV2;
pV2 = &VtxArray[StartVertexIndex + *puIndices++];
DrawTriangle(pV0, pV2, pV1);
}
if( i > 0 )
{
pV0 = pV1;
pV1 = pV2;
pV2 = &VtxArray[StartVertexIndex + *puIndices++];
DrawTriangle(pV0, pV1, pV2);
}
}
break;
case D3DPT_TRIANGLEFAN:
{
pV2 = &VtxArray[StartVertexIndex + *puIndices++];
// Preload initial pV0.
pV1 = &VtxArray[StartVertexIndex + *puIndices++];
for (i = (INT)cIndices - 2; i > 0; i--)
{
pV0 = pV1;
pV1 = &VtxArray[StartVertexIndex + *puIndices++];
DrawTriangle(pV0, pV1, pV2);
}
}
break;
default:
DPFERR("Refrast Error: Unknown or unsupported primitive type "
"requested of DrawOneIndexedPrimitive");
return DDERR_INVALIDPARAMS;
}
return D3D_OK;
}
///////////////////////////////////////////////////////////////////////////////
//
///////////////////////////////////////////////////////////////////////////////
void
RefClipper::DrawTriangle( RDVertex* pV0, RDVertex* pV1, RDVertex* pV2,
WORD wFlags )
{
// If the clip-codes dont exist then compute them. This happens only
// for Transformed vertices that are directly passed in to be rasterized.
if( (pV0->m_qwFVF & D3DFVFP_CLIP) == 0 ) ComputeClipCodesTL( pV0 );
if( (pV1->m_qwFVF & D3DFVFP_CLIP) == 0 ) ComputeClipCodesTL( pV1 );
if( (pV2->m_qwFVF & D3DFVFP_CLIP) == 0 ) ComputeClipCodesTL( pV2 );
RDCLIPCODE c0 = pV0->m_clip;
RDCLIPCODE c1 = pV1->m_clip;
RDCLIPCODE c2 = pV2->m_clip;
DWORD dwInter = (c0 & c1 & c2);
DWORD dwUnion = (c0 | c1 | c2);
DWORD dwMask = (UseGuardBand()) ? RDCLIPGB_ALL : RDCLIP_ALL;
// All vertices outside the frustum or guardband,
// return without drawing
if( dwInter )
{
return;
}
// If all the vertices are in, draw and return
if( (dwUnion & dwMask) == 0 )
{
m_pDev->DrawTriangle( pV0, pV1, pV2, wFlags );
return;
}
// Do Clipping
RDCLIPTRIANGLE newtri;
RDClipVertex cv[3];
MakeClipVertexFromVertex( cv[0], *pV0, dwMask);
MakeClipVertexFromVertex( cv[1], *pV1, dwMask);
MakeClipVertexFromVertex( cv[2], *pV2, dwMask);
newtri.v[0] = &cv[0]; cv[0].next = &cv[1];
newtri.v[1] = &cv[1]; cv[1].next = &cv[2];
newtri.v[2] = &cv[2]; cv[2].next = NULL;
int count;
RDClipVertex **ver;
cv[0].m_clip |= CLIPPED_ENABLE;
cv[1].m_clip |= CLIPPED_ENABLE;
cv[2].m_clip |= CLIPPED_ENABLE;
if( count = ClipSingleTriangle( &newtri, &ver ) )
{
int i;
// Temporary Byte Array
if( FAILED( ClipBuf.Grow(count) ) ) return;
for (i = 0; i < count; i++)
{
MakeVertexFromClipVertex( ClipBuf[i], *(ver[i]) );
ClipBuf[i].SetFVF( pV0->m_qwFVF );
}
// If it is in wireframe mode, convert the clipper output to
// a line list.
if( m_dwFlags & RCLIP_DO_WIREFRAME )
{
DWORD dwEdgeFlags = 0;
for (i = 0; i < count; i++)
{
if( ver[i]->m_clip & CLIPPED_ENABLE ) dwEdgeFlags |= (1 << i);
}
m_pDev->DrawOneEdgeFlagTriangleFan( ClipBuf, count, dwEdgeFlags );
}
else
{
m_pDev->DrawOnePrimitive( ClipBuf, 0, D3DPT_TRIANGLEFAN, count );
}
}
}
void
RefClipper::DrawLine( RDVertex* pV0, RDVertex* pV1 )
{
// If the clip-codes dont exist then compute them. This happens only
// for Transformed vertices that are directly passed in to be rasterized.
if( (pV0->m_qwFVF & D3DFVFP_CLIP) == 0 ) ComputeClipCodesTL( pV0 );
if( (pV1->m_qwFVF & D3DFVFP_CLIP) == 0 ) ComputeClipCodesTL( pV1 );
RDCLIPCODE c0 = pV0->m_clip;
RDCLIPCODE c1 = pV1->m_clip;
DWORD dwInter = (c0 & c1);
DWORD dwUnion = (c0 | c1);
DWORD dwMask = (UseGuardBand()) ? RDCLIPGB_ALL : RDCLIP_ALL;
// All vertices outside the frustum or guardband,
// return without drawing
if( dwInter )
{
return;
}
// If all the vertices are in, draw and return
if( (dwUnion & dwMask) == 0 )
{
m_pDev->DrawLine( pV0, pV1 );
return;
}
RDCLIPTRIANGLE newline;
RDClipVertex cv[2];
MakeClipVertexFromVertex( cv[0], *pV0, dwMask );
MakeClipVertexFromVertex( cv[1], *pV1, dwMask );
newline.v[0] = &cv[0];
newline.v[1] = &cv[1];
if( ClipSingleLine( &newline ) )
{
// Temporary Byte Array
if( FAILED(ClipBuf.Grow( 2 )) ) return;
MakeVertexFromClipVertex( ClipBuf[0], *(newline.v[0]) );
MakeVertexFromClipVertex( ClipBuf[1], *(newline.v[1]) );
ClipBuf[0].SetFVF( pV0->m_qwFVF );
ClipBuf[1].SetFVF( pV0->m_qwFVF );
m_pDev->DrawLine( &ClipBuf[0], &ClipBuf[1] );
}
}
void
RefClipper::DrawPoint( RDVertex* pV0 )
{
// If the clip-codes dont exist then compute them. This happens only
// for Transformed vertices that are directly passed in to be rasterized.
if( (pV0->m_qwFVF & D3DFVFP_CLIP) == 0 ) ComputeClipCodesTL( pV0 );
RDCLIPCODE c0 = pV0->m_clip;
DWORD dwMask = (UseGuardBand()) ? RDCLIPGB_ALL : RDCLIP_ALL;
// if definitely out
#if 0
if( c0 & (RDCLIP_FRONT | RDCLIP_BACK |
(1<<RDCLIPGB_LEFTBIT) | (1<<RDCLIPGB_RIGHTBIT) |
(1<<RDCLIPGB_TOPBIT) | (1<<RDCLIPGB_BOTTOMBIT)) )
return;
#else
if( c0 & dwMask ) return;
#endif
// is completely in, just draw it
m_pDev->DrawPoint( pV0 );
}
////////////////////////////////////////////////////////////////////////////
//
// Returns 0, if triangle is clipped. Number of vertices otherwise.
//
// Original vertices should not be modified inside the function
////////////////////////////////////////////////////////////////////////////
int
RefClipper::ClipSingleTriangle( RDCLIPTRIANGLE *tri,
RDClipVertex ***clipVertexPointer )
{
int accept;
int i, j;
int count;
RDClipVertex **inv;
RDClipVertex **outv;
RDClipVertex *p;
ULONG_PTR swapv;
RDCOLOR4 diffuse1; // Original colors
RDCOLOR4 specular1;
RDCOLOR4 diffuse2;
RDCOLOR4 specular2;
DWORD dwClipBit;
DWORD dwClippedBit;
if( m_dwFlags & RCLIP_DO_FLATSHADING )
{
// It is easier to set all vertices to the same color here
RDCOLOR4 diffuse = tri->v[0]->m_diffuse;
RDCOLOR4 specular = tri->v[0]->m_specular;
//Save original colors
diffuse1 = tri->v[1]->m_diffuse;
specular1 = tri->v[1]->m_specular;
diffuse2 = tri->v[2]->m_diffuse;
specular2 = tri->v[2]->m_specular;
tri->v[1]->m_diffuse = diffuse;
tri->v[1]->m_specular = specular;
tri->v[2]->m_diffuse = diffuse;
tri->v[2]->m_specular = specular;
}
accept = (tri->v[0]->m_clip | tri->v[1]->m_clip | tri->v[2]->m_clip);
inv = tri->v;
count = 3;
outv = clip_vbuf1;
clip_color = tri->v[0]->m_diffuse;
clip_specular = tri->v[0]->m_specular;
/*
* XXX assumes sizeof(void*) == sizeof(unsigned long)
*/
{
ULONG_PTR tmp1;
ULONG_PTR tmp2;
tmp1 = (ULONG_PTR)clip_vbuf1;
tmp2 = (ULONG_PTR)clip_vbuf2;
swapv = tmp1 + tmp2;
}
clip_vertices_used = 0;
#define SWAP(inv, outv) \
inv = outv; \
outv = (RDClipVertex**) (swapv - (ULONG_PTR) outv)
if( accept & RDCLIP_FRONT )
{
count = ClipFront( inv, outv, count );
if( count < 3 )
goto out_of_here;
SWAP(inv, outv);
}
if( UseGuardBand() )
{
// If there was clipping by the front plane it is better to
// compute clip code for new vertices and re-compute accept.
// Otherwise we will try to clip by sides when it is not necessary
if( accept & RDCLIP_FRONT )
{
accept = 0;
for (i = 0; i < count; i++)
{
RDClipVertex *p;
p = inv[i];
if( p->m_clip & CLIPPED_FRONT )
accept |= ComputeClipCodeGB( p );
else
accept |= p->m_clip;
}
}
if( accept & RDCLIP_BACK )
{
count = ClipBack( inv, outv, count );
if( count < 3 )
goto out_of_here;
SWAP(inv, outv);
}
if( accept & RDCLIPGB_LEFT )
{
count = ClipLeftGB( inv, outv, count );
if( count < 3 )
goto out_of_here;
SWAP(inv, outv);
}
if( accept & RDCLIPGB_RIGHT )
{
count = ClipRightGB( inv, outv, count );
if( count < 3 )
goto out_of_here;
SWAP(inv, outv);
}
if( accept & RDCLIPGB_BOTTOM )
{
count = ClipBottomGB( inv, outv, count );
if( count < 3 )
goto out_of_here;
SWAP(inv, outv);
}
if( accept & RDCLIPGB_TOP )
{
count = ClipTopGB( inv, outv, count );
if( count < 3 )
goto out_of_here;
SWAP(inv, outv);
}
}
else
{
// If there was clipping by the front plane it is better to
// compute clip code for new vertices and re-compute accept.
// Otherwise we will try to clip by sides when it is not necessary
if( accept & RDCLIP_FRONT )
{
accept = 0;
for (i = 0; i < count; i++)
{
RDClipVertex *p;
p = inv[i];
if( p->m_clip & (CLIPPED_FRONT) )
accept |= ComputeClipCode( p );
else
accept |= p->m_clip;
}
}
if( accept & RDCLIP_BACK )
{
count = ClipBack( inv, outv, count );
if( count < 3 )
goto out_of_here;
SWAP(inv, outv);
}
if( accept & RDCLIP_LEFT )
{
count = ClipLeft( inv, outv, count );
if( count < 3 )
goto out_of_here;
SWAP(inv, outv);
}
if( accept & RDCLIP_RIGHT )
{
count = ClipRight( inv, outv, count );
if( count < 3 )
goto out_of_here;
SWAP(inv, outv);
}
if( accept & RDCLIP_BOTTOM )
{
count = ClipBottom( inv, outv, count );
if( count < 3 )
goto out_of_here;
SWAP(inv, outv);
}
if( accept & RDCLIP_TOP )
{
count = ClipTop( inv, outv, count );
if( count < 3 )
goto out_of_here;
SWAP(inv, outv);
}
}
dwClipBit = RDCLIP_USERCLIPPLANE0;
dwClippedBit = CLIPPED_USERCLIPPLANE0;
// User Clip Planes
for( j=0; j<RD_MAX_USER_CLIPPLANES; j++)
{
if( accept & dwClipBit )
{
count = ClipByPlane( inv, outv, &(m_xfmUserClipPlanes[j].plane),
dwClippedBit, count);
if( count < 3 )
goto out_of_here;
SWAP(inv, outv);
}
dwClipBit <<= 1;
dwClippedBit <<= 1;
}
#undef SWAP
ComputeScreenCoordinates( inv, count );
*clipVertexPointer = inv;
current_vbuf = inv;
return count;
out_of_here:
*clipVertexPointer = NULL;
return 0;
}
//-----------------------------------------------------------------------
//
int
RefClipper::ClipSingleLine( RDCLIPTRIANGLE *line )
{
int accept;
int j;
D3DVALUE in1, in2;
DWORD dwClipBit;
DWORD dwClippedBit;
accept = (line->v[0]->m_clip | line->v[1]->m_clip);
clip_color = line->v[0]->m_diffuse;
clip_specular = line->v[0]->m_specular;
if( accept & D3DCS_FRONT )
if( ClipLineFront(line) )
goto out_of_here;
if( UseGuardBand() )
{
// If there was clipping by the front plane it is better to
// compute clip code for new vertices and re-compute accept.
// Otherwise we will try to clip by sides when it is not necessary
if( accept & D3DCS_FRONT )
{
RDClipVertex * p;
accept = 0;
p = line->v[0];
if( p->m_clip & CLIPPED_FRONT )
accept |= ComputeClipCodeGB( p );
else
accept |= p->m_clip;
p = line->v[1];
if( p->m_clip & CLIPPED_FRONT )
accept |= ComputeClipCodeGB( p );
else
accept |= p->m_clip;
}
if( accept & D3DCS_BACK )
if( ClipLineBack( line ) )
goto out_of_here;
if( accept & RDCLIPGB_LEFT )
if( ClipLineLeftGB( line ) )
goto out_of_here;
if( accept & RDCLIPGB_RIGHT )
if( ClipLineRightGB( line ) )
goto out_of_here;
if( accept & RDCLIPGB_TOP )
if( ClipLineTopGB( line ) )
goto out_of_here;
if( accept & RDCLIPGB_BOTTOM )
if( ClipLineBottomGB( line ) )
goto out_of_here;
}
else
{
// If there was clipping by the front plane it is better to
// compute clip code for new vertices and re-compute accept.
// Otherwise we will try to clip by sides when it is not necessary
if( accept & D3DCS_FRONT )
{
RDClipVertex * p;
accept = 0;
p = line->v[0];
if( p->m_clip & CLIPPED_FRONT )
accept |= ComputeClipCode( p );
else
accept |= p->m_clip;
p = line->v[1];
if( p->m_clip & CLIPPED_FRONT )
accept |= ComputeClipCode( p );
else
accept |= p->m_clip;
}
if( accept & D3DCS_BACK )
if( ClipLineBack( line ) )
goto out_of_here;
if( accept & D3DCS_LEFT )
if( ClipLineLeft( line ) )
goto out_of_here;
if( accept & D3DCS_RIGHT )
if( ClipLineRight( line ) )
goto out_of_here;
if( accept & D3DCS_TOP )
if( ClipLineTop( line ) )
goto out_of_here;
if( accept & D3DCS_BOTTOM )
if( ClipLineBottom( line ) )
goto out_of_here;
}
// User Clip Planes
dwClipBit = RDCLIP_USERCLIPPLANE0;
dwClippedBit = CLIPPED_USERCLIPPLANE0;
for( j=0; j<RD_MAX_USER_CLIPPLANES; j++)
{
if( accept & dwClipBit )
{
if( ClipLineByPlane( line, &m_xfmUserClipPlanes[j].plane,
dwClippedBit ))
goto out_of_here;
}
dwClipBit <<= 1;
dwClippedBit <<= 1;
}
ComputeScreenCoordinates( line->v, 2 );
return 1;
out_of_here:
return 0;
}
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