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Fix pinterp() to compute 1 / FRAG_ATTRIB_WPOS.w Update comments too.

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This commit is contained in:
Brian
2007-07-25 14:27:38 -06:00
parent d24e60a6b1
commit be8725321c
1 changed files with 7 additions and 6 deletions
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src/mesa/pipe/softpipe/sp_quad_fs.c
+7 -6
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@@ -91,11 +91,11 @@ static INLINE void linterp( struct exec_machine *exec,
*
* Push into the fp:
*
* INPUT[attr] = MAD COEF_A0[attr], COEF_DADX[attr], INPUT_WPOS.xxxx
* INPUT[attr] = MAD INPUT[attr], COEF_DADY[attr], INPUT_WPOS.yyyy
* INPUT[attr] = MUL INPUT[attr], INPUT_WPOS.wwww
* INPUT[attr] = MAD COEF_DADX[attr], INPUT_WPOS.xxxx, COEF_A0[attr]
* INPUT[attr] = MAD COEF_DADY[attr], INPUT_WPOS.yyyy, INPUT[attr]
* TMP = RCP INPUT_WPOS.w
* INPUT[attr] = MUL INPUT[attr], TMP.xxxx
*
* (Or should that be 1/w ???)
*/
static INLINE void pinterp( struct exec_machine *exec,
GLuint attrib,
@@ -106,10 +106,11 @@ static INLINE void pinterp( struct exec_machine *exec,
for (j = 0; j < QUAD_SIZE; j++) {
const GLfloat x = exec->attr[FRAG_ATTRIB_WPOS][0][j];
const GLfloat y = exec->attr[FRAG_ATTRIB_WPOS][1][j];
const GLfloat invW = exec->attr[FRAG_ATTRIB_WPOS][3][j];
/* FRAG_ATTRIB_WPOS.w here is really 1/w */
const GLfloat w = 1.0 / exec->attr[FRAG_ATTRIB_WPOS][3][j];
exec->attr[attrib][i][j] = ((exec->coef[attrib].a0[i] +
exec->coef[attrib].dadx[i] * x +
exec->coef[attrib].dady[i] * y) * invW);
exec->coef[attrib].dady[i] * y) * w);
}
}