diff options
Diffstat (limited to 'src/mesa/swrast/s_span.c')
| -rw-r--r-- | src/mesa/swrast/s_span.c | 35 |
1 files changed, 22 insertions, 13 deletions
diff --git a/src/mesa/swrast/s_span.c b/src/mesa/swrast/s_span.c index 6fb5998627..724cf616e8 100644 --- a/src/mesa/swrast/s_span.c +++ b/src/mesa/swrast/s_span.c @@ -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; } } } |