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Bug 7790: Polygons incorrectly clipped by mach64 driver

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un-break strict-aliasing rules
This commit is contained in:
George Sapountzis
2006-12-07 17:53:59 +02:00
parent 26626c0052
commit eed1a6de4b
1 changed files with 10 additions and 7 deletions
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src/mesa/drivers/dri/mach64/mach64_tris.c
+10 -7
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@@ -1583,7 +1583,10 @@ static void mach64FastRenderClippedPoly( GLcontext *ctx, const GLuint *elts,
mach64ContextPtr mmesa = MACH64_CONTEXT( ctx );
const GLuint vertsize = mmesa->vertex_size;
GLint a;
GLfloat ooa;
union {
GLfloat f;
CARD32 u;
} ooa;
GLuint xy;
const GLuint xyoffset = 9;
GLint xx[3], yy[3]; /* 2 fractional bits for hardware */
@@ -1621,7 +1624,7 @@ static void mach64FastRenderClippedPoly( GLcontext *ctx, const GLuint *elts,
return;
}
ooa = 16.0 / a;
ooa.f = 16.0 / a;
vb = (CARD32 *)mach64AllocDmaLow( mmesa, vbsiz * sizeof(CARD32) );
vbchk = vb + vbsiz;
@@ -1629,7 +1632,7 @@ static void mach64FastRenderClippedPoly( GLcontext *ctx, const GLuint *elts,
COPY_VERTEX( vb, vertsize, v0, 1 );
COPY_VERTEX( vb, vertsize, v1, 2 );
COPY_VERTEX_OOA( vb, vertsize, v2, 3 );
LE32_OUT( vb++, *(CARD32 *)&ooa );
LE32_OUT( vb++, ooa.u );
i = 3;
while (1) {
@@ -1644,10 +1647,10 @@ static void mach64FastRenderClippedPoly( GLcontext *ctx, const GLuint *elts,
a = (xx[0] - xx[2]) * (yy[1] - yy[2]) -
(yy[0] - yy[2]) * (xx[1] - xx[2]);
ooa = 16.0 / a;
ooa.f = 16.0 / a;
COPY_VERTEX_OOA( vb, vertsize, v0, 1 );
LE32_OUT( vb++, *(CARD32 *)&ooa );
LE32_OUT( vb++, ooa.u );
if (i >= n)
break;
@@ -1660,10 +1663,10 @@ static void mach64FastRenderClippedPoly( GLcontext *ctx, const GLuint *elts,
a = (xx[0] - xx[2]) * (yy[1] - yy[2]) -
(yy[0] - yy[2]) * (xx[1] - xx[2]);
ooa = 16.0 / a;
ooa.f = 16.0 / a;
COPY_VERTEX_OOA( vb, vertsize, v1, 2 );
LE32_OUT( vb++, *(CARD32 *)&ooa );
LE32_OUT( vb++, ooa.u );
}
assert( vb == vbchk );