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unroll inner loop of interpolate_varying()

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Brian 2007-02-02 11:23:16 -07:00
parent 531348e814
commit 6147ccba63
1 changed files with 22 additions and 13 deletions
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35
src/mesa/swrast/s_span.c
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@ -702,19 +702,28 @@ interpolate_varying(GLcontext *ctx, SWspan *span)
for (var = 0; var < MAX_VARYING; var++) {
if (inputsUsed & FRAG_BIT_VAR(var)) {
const GLuint attr = FRAG_ATTRIB_VAR0 + var;
GLuint j;
for (j = 0; j < 4; j++) {
const GLfloat dvdx = span->attrStepX[attr][j];
GLfloat v = span->attrStart[attr][j];
const GLfloat dwdx = span->attrStepX[FRAG_ATTRIB_WPOS][3];
GLfloat w = span->attrStart[FRAG_ATTRIB_WPOS][3];
GLuint k;
for (k = 0; k < span->end; k++) {
GLfloat invW = 1.0f / w;
span->array->attribs[attr][k][j] = v * invW;
v += dvdx;
w += dwdx;
}
const GLfloat dwdx = span->attrStepX[FRAG_ATTRIB_WPOS][3];
GLfloat w = span->attrStart[FRAG_ATTRIB_WPOS][3];
const GLfloat dv0dx = span->attrStepX[attr][0];
const GLfloat dv1dx = span->attrStepX[attr][1];
const GLfloat dv2dx = span->attrStepX[attr][2];
const GLfloat dv3dx = span->attrStepX[attr][3];
GLfloat v0 = span->attrStart[attr][0];
GLfloat v1 = span->attrStart[attr][1];
GLfloat v2 = span->attrStart[attr][2];
GLfloat v3 = span->attrStart[attr][3];
GLuint k;
for (k = 0; k < span->end; k++) {
GLfloat invW = 1.0f / w;
span->array->attribs[attr][k][0] = v0 * invW;
span->array->attribs[attr][k][1] = v1 * invW;
span->array->attribs[attr][k][2] = v2 * invW;
span->array->attribs[attr][k][3] = v3 * invW;
v0 += dv0dx;
v1 += dv1dx;
v2 += dv2dx;
v3 += dv3dx;
w += dwdx;
}
}
}