void rastBBox_uPoly_fix( u_Poly< long , ushort >& poly,
zbuff& z,
long screen_w,
long screen_h,
long si, //sample interval
int si_lg2, //log2 of sample interval
long r_shift,
long r_val )
{
//Calculate BBox
bool valid ; // is u_poly valid based on bbox
long ll_x, ll_y, ur_x, ur_y ;
long s_x , s_y ;
long j_x , j_y ;
int x , y , ss_x , ss_y , vert;
fragment f ;
rastBBox_bbox_fix( poly, ll_x, ll_y, ur_x, ur_y,
z.ss_w_lg2, screen_w, screen_h,
valid, r_shift, r_val );
//Iterate over Samples, Test if In uPoly
for( s_x = ll_x ; s_x <= ur_x ; s_x += si ){
for( s_y = ll_y ; s_y <= ur_y ; s_y += si ){
rastBBox_jhash_jit_fix( s_x, s_y, z.ss_w_lg2, &j_x, &j_y);
j_x = j_x << 2;
j_y = j_y << 2;
vert = rastBBox_stest_fix( poly , s_x + j_x , s_y + j_y );
if( vert != -1 ){
x = s_x >> r_shift;
y = s_y >> r_shift;
ss_x = (s_x - (x << r_shift)) / si;
ss_y = (s_y - (y << r_shift)) / si;
f.z = poly.v[vert].x[2];
f.c[0] = poly.v[vert].c[0];
f.c[1] = poly.v[vert].c[1];
f.c[2] = poly.v[vert].c[2];
f.c[3] = poly.v[vert].c[3];
z.process_Fragment( x , y , ss_x , ss_y ,
f.z , f.c[0] , f.c[1] ,
f.c[2] , f.c[3] );
}
}
}
/*
Test Rast
This is a test function with a
few cases with known results.
These tests should act as a rough
test of whether the bounding box
and sample test operation have
been configured correctly.
This function also demonstrates
how some of the primitives are defined.
*/
bool testRast()
{
/* Lets Describe the Screen Space */
long r_shift = 10 ; //This is the number of fractional bits
long r_val = 1024 ; //This is the value of 1 << r_shift
long screen_w = 1024 << r_shift ; // 1024 pixels wide (on x axis)
long screen_h = 1024 << r_shift ; // 1024 pixels tall (on y axit)
int ss_w_lg2 = 2 ; // This is the log_2 ( sqrt( MSAA ) )
u_Poly< long , ushort > poly; //This is a micropolygon
poly.v[0].x[0] = 556 << ( r_shift - ss_w_lg2 ); //v0.x
poly.v[0].x[1] = 679 << ( r_shift - ss_w_lg2 ); //v0.y
poly.v[1].x[0] = 562 << ( r_shift - ss_w_lg2 ); //v1.x
poly.v[1].x[1] = 660 << ( r_shift - ss_w_lg2 ); //v1.y
poly.v[2].x[0] = 557 << ( r_shift - ss_w_lg2 ); //v2.x
poly.v[2].x[1] = 661 << ( r_shift - ss_w_lg2 ); //v2.y
poly.v[3].x[0] = 561 << ( r_shift - ss_w_lg2 ); //v3.x
poly.v[3].x[1] = 680 << ( r_shift - ss_w_lg2 ); //v.y
poly.vertices = 3; //The number of vertices
// Three is a triangle
// Four is a quadrilateral
// Note that there are other parameters in
// a micropolygon, but they are more or less
// irrelevant for this portion of the algorithm
long ll_x;
long ll_y;
long ur_x;
long ur_y;
bool valid;
long s_x , s_y ;
int hit ;
printf( "Test 1: Bounding Box Test\n" );
poly.vertices = 3;
rastBBox_bbox_fix( poly, ll_x, ll_y, ur_x, ur_y, ss_w_lg2,
screen_w, screen_h, valid, r_shift, r_val);
if( ! valid ){
abort_("Fail Test 1");
}
if( ll_x != (556 << ( r_shift - ss_w_lg2 )) ){
abort_("Fail Test 1");
}
if( ll_y != (660 << ( r_shift - ss_w_lg2 )) ){
abort_("Fail Test 1");
}
if( ur_x != (562 << ( r_shift - ss_w_lg2 )) ){
abort_("Fail Test 1");
}
if( ur_y != (679 << ( r_shift - ss_w_lg2 )) ){
abort_("Fail Test 1");
}
// check some more conditions
poly.v[0].x[0] = (556 << ( r_shift - ss_w_lg2 )) - 1;
poly.v[0].x[1] = (679 << ( r_shift - ss_w_lg2 )) + 1;
poly.v[1].x[1] = (660 << ( r_shift - ss_w_lg2 )) + 1;
poly.v[1].x[0] = (562 << ( r_shift - ss_w_lg2 )) - 1;
rastBBox_bbox_fix( poly, ll_x, ll_y, ur_x, ur_y, ss_w_lg2,
screen_w, screen_h, valid, r_shift, r_val);
if ( ll_x != (555 << ( r_shift - ss_w_lg2 )) ){
abort_("Fail Test 1: did not round down correctly");
}
if ( ur_y != (680 << ( r_shift - ss_w_lg2 )) ){
abort_("Fail Test 1: did not round up correctly");
}
if( ll_y != (660 << ( r_shift - ss_w_lg2 )) ){
abort_("Fail Test 1: did not round down correctly");
}
if( ur_x != (562 << ( r_shift - ss_w_lg2 )) ){
abort_("Fail Test 1: did not round up correctly");
}
// reset the values for later use
poly.v[0].x[0] = (556 << ( r_shift - ss_w_lg2 ));
poly.v[0].x[1] = (679 << ( r_shift - ss_w_lg2 ));
poly.v[1].x[1] = (660 << ( r_shift - ss_w_lg2 ));
poly.v[1].x[0] = (562 << ( r_shift - ss_w_lg2 ));
printf( "\t\tPass Test 1\n");
/*
If you are having trouble determining if your bounding
box function is correct, you can add more test cases
here.
*/
printf( "Test 2: SampleTest Test\n" );
poly.vertices = 3;
s_x = 559 << ( r_shift - 2 );
s_y = 662 << ( r_shift - 2 );
hit = rastBBox_stest_fix( poly, s_x , s_y);
if( hit == -1 ) { //If a miss
abort_("Failed Test 2");
}
printf( "\t\tPass Test 2\n");
printf( "Test 3: SampleTest Test\n" );
poly.vertices = 3;
s_x = 560 << ( r_shift - 2 );
s_y = 678 << ( r_shift - 2 );
hit = rastBBox_stest_fix( poly, s_x , s_y);
if( hit!=-1 ) { //If a hit
abort_("Failed Test 3");
}
printf( "\t\tPass Test 3\n");
/*
If you are having trouble determining if your sample test
function is correct, you can add more test cases
here.
*/
return true ;
}
