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static __inline void TAG(triangle)( GLcontext *ctx, GLuint e0,
GLuint e1, GLuint e2, GLuint pv )
{
mgaContextPtr mmesa = MGA_CONTEXT( ctx );
GLuint vertsize = mmesa->vertsize;
mgaUI32 *wv = mgaAllocVertexDwords( mmesa, 3 * vertsize);
struct vertex_buffer *VB = ctx->VB;
mgaVertexPtr mgaVB = MGA_DRIVER_DATA(VB)->verts;
const mgaVertex *v[3];
int i, j;
#if (IND & MGA_OFFSET_BIT)
GLfloat offset = ctx->Polygon.OffsetUnits * 1.0/0x10000;
#endif
#if (IND & (MGA_FLAT_BIT|MGA_TWOSIDE_BIT))
mgaUI32 c[3];
c[2] = c[1] = c[0] = *(mgaUI32 *)&mgaVB[pv].warp2.color;
#endif
(void) VB;
v[0] = &mgaVB[e0];
v[1] = &mgaVB[e1];
v[2] = &mgaVB[e2];
#if (IND & (MGA_TWOSIDE_BIT|MGA_OFFSET_BIT))
{
GLfloat ex = v[0]->warp1.x - v[2]->warp1.x;
GLfloat ey = v[0]->warp1.y - v[2]->warp1.y;
GLfloat fx = v[1]->warp1.x - v[2]->warp1.x;
GLfloat fy = v[1]->warp1.y - v[2]->warp1.y;
GLfloat cc = ex*fy-ey*fx;
#if (IND & MGA_TWOSIDE_BIT)
{
GLuint facing = (cc>0.0) ^ ctx->Polygon.FrontBit;
GLubyte (*vbcolor)[4] = VB->Color[facing]->data;
if (IND & MGA_FLAT_BIT) {
MGA_COLOR((char *)&c[0],vbcolor[pv]);
c[2] = c[1] = c[0];
} else {
MGA_COLOR((char *)&c[0],vbcolor[e0]);
MGA_COLOR((char *)&c[1],vbcolor[e1]);
MGA_COLOR((char *)&c[2],vbcolor[e2]);
}
}
#endif
#if (IND & MGA_OFFSET_BIT)
{
if (cc * cc > 1e-16) {
GLfloat factor = ctx->Polygon.OffsetFactor;
GLfloat ez = v[0]->warp1.z - v[2]->warp1.z;
GLfloat fz = v[1]->warp1.z - v[2]->warp1.z;
GLfloat a = ey*fz-ez*fy;
GLfloat b = ez*fx-ex*fz;
GLfloat ic = 1.0 / cc;
GLfloat ac = a * ic;
GLfloat bc = b * ic;
if (ac<0.0F) ac = -ac;
if (bc<0.0F) bc = -bc;
offset += MAX2( ac, bc ) * factor;
}
}
#endif
}
#endif
mgaglx.c_triangles++;
for (j = 0 ; j < 3 ; j++, wv += vertsize) {
for (i = 0 ; i < vertsize ; i++)
wv[i] = v[j]->ui[i];
#if (IND & (MGA_FLAT_BIT|MGA_TWOSIDE_BIT))
wv[4] = c[j]; /* color is the fifth element... */
#endif
#if (IND & MGA_OFFSET_BIT)
*(float *)&wv[2] = v[j]->warp1.z + offset;
#endif
}
}
static void TAG(quad)( GLcontext *ctx, GLuint v0,
GLuint v1, GLuint v2, GLuint v3,
GLuint pv )
{
TAG(triangle)( ctx, v0, v1, v3, pv );
TAG(triangle)( ctx, v1, v2, v3, pv );
}
#if ((IND & ~MGA_FLAT_BIT) == 0)
static void TAG(line)( GLcontext *ctx, GLuint v0, GLuint v1, GLuint pv )
{
mgaContextPtr mmesa = MGA_CONTEXT( ctx );
mgaVertexPtr mgaVB = MGA_DRIVER_DATA(ctx->VB)->verts;
float width = ctx->Line.Width;
if (IND & MGA_FLAT_BIT) {
mgaVertex tmp0 = mgaVB[v0];
mgaVertex tmp1 = mgaVB[v1];
*(int *)&tmp0.warp1.color = *(int *)&mgaVB[pv].warp1.color;
*(int *)&tmp1.warp1.color = *(int *)&mgaVB[pv].warp1.color;
mga_draw_line( mmesa, &tmp0, &tmp1, width );
}
else
mga_draw_line( mmesa, &mgaVB[v0], &mgaVB[v1], width );
}
static void TAG(points)( GLcontext *ctx, GLuint first, GLuint last )
{
mgaContextPtr mmesa = MGA_CONTEXT( ctx );
struct vertex_buffer *VB = ctx->VB;
mgaVertexPtr mgaVB = MGA_DRIVER_DATA(VB)->verts;
GLfloat sz = ctx->Point.Size * .5;
int i;
for(i=first;i<=last;i++)
if(VB->ClipMask[i]==0)
mga_draw_point( mmesa, &mgaVB[i], sz );
}
#endif
static void TAG(init)( void )
{
tri_tab[IND] = TAG(triangle);
quad_tab[IND] = TAG(quad);
#if ((IND & ~MGA_FLAT_BIT) == 0)
line_tab[IND] = TAG(line);
points_tab[IND] = TAG(points);
#endif
}
#undef IND
#undef TAG
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