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swrast: fix left side clipping

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Fixes bug 26623.  Original patch was submitted by Mathias Frohlich
and modified by Brian.
This commit is contained in:
Brian Paul 2010-02-18 09:37:55 -07:00
parent 13cd4298fb
commit 7c34c237a2
1 changed files with 38 additions and 5 deletions
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43
src/mesa/swrast/s_span.c
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@ -784,14 +784,47 @@ clip_span( GLcontext *ctx, SWspan *span )
* For arrays of values, shift them left.
*/
for (i = 0; i < FRAG_ATTRIB_MAX; i++) {
if (span->arrayAttribs & (1 << i)) {
/* shift array elements left by 'leftClip' */
_mesa_memcpy(span->array->attribs[i],
span->array->attribs[i] + leftClip,
(n - leftClip) * 4 * sizeof(GLfloat));
if (span->interpMask & (1 << i)) {
GLuint j;
for (j = 0; j < 4; j++) {
span->attrStart[i][j] += leftClip * span->attrStepX[i][j];
}
}
}
span->red += leftClip * span->redStep;
span->green += leftClip * span->greenStep;
span->blue += leftClip * span->blueStep;
span->alpha += leftClip * span->alphaStep;
span->index += leftClip * span->indexStep;
span->z += leftClip * span->zStep;
span->intTex[0] += leftClip * span->intTexStep[0];
span->intTex[1] += leftClip * span->intTexStep[1];
#define SHIFT_ARRAY(ARRAY, SHIFT, LEN) \
memcpy(ARRAY, ARRAY + (SHIFT), (LEN) * sizeof(ARRAY[0]))
for (i = 0; i < FRAG_ATTRIB_MAX; i++) {
if (span->arrayAttribs & (1 << i)) {
/* shift array elements left by 'leftClip' */
SHIFT_ARRAY(span->array->attribs[i], leftClip, n - leftClip);
}
}
SHIFT_ARRAY(span->array->mask, leftClip, n - leftClip);
SHIFT_ARRAY(span->array->rgba8, leftClip, n - leftClip);
SHIFT_ARRAY(span->array->rgba16, leftClip, n - leftClip);
SHIFT_ARRAY(span->array->x, leftClip, n - leftClip);
SHIFT_ARRAY(span->array->y, leftClip, n - leftClip);
SHIFT_ARRAY(span->array->z, leftClip, n - leftClip);
SHIFT_ARRAY(span->array->index, leftClip, n - leftClip);
for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++) {
SHIFT_ARRAY(span->array->lambda[i], leftClip, n - leftClip);
}
SHIFT_ARRAY(span->array->coverage, leftClip, n - leftClip);
#undef SHIFT_ARRAY
span->leftClip = leftClip;
span->x = xmin;
span->end -= leftClip;