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i965: fix for flat shading on Sandybridge

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use constant interpolation instead of linear interpolation for
attributes COL0,COL1 if GL_FLAT is used. This fixes mesa demo bounce.
This commit is contained in:
Xiang, Haihao 2010-12-06 09:33:18 +08:00
parent 4409435614
commit 08be8d6450
1 changed files with 9 additions and 2 deletions
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11
src/mesa/drivers/dri/i965/gen6_sf_state.c
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@ -69,7 +69,7 @@ upload_sf_state(struct brw_context *brw)
uint32_t num_inputs = brw_count_bits(brw->vs.prog_data->outputs_written);
/* BRW_NEW_FRAGMENT_PROGRAM */
uint32_t num_outputs = brw_count_bits(brw->fragment_program->Base.InputsRead);
uint32_t dw1, dw2, dw3, dw4, dw16;
uint32_t dw1, dw2, dw3, dw4, dw16, dw17;
int i;
/* _NEW_BUFFER */
GLboolean render_to_fbo = brw->intel.ctx.DrawBuffer->Name != 0;
@ -92,6 +92,7 @@ upload_sf_state(struct brw_context *brw)
dw3 = 0;
dw4 = 0;
dw16 = 0;
dw17 = 0;
/* _NEW_POLYGON */
if ((ctx->Polygon.FrontFace == GL_CCW) ^ render_to_fbo)
@ -203,6 +204,12 @@ upload_sf_state(struct brw_context *brw)
}
}
/* flat shading */
if (ctx->Light.ShadeModel == GL_FLAT) {
dw17 |= ((brw->fragment_program->Base.InputsRead & (FRAG_BIT_COL0 | FRAG_BIT_COL1)) >>
((brw->fragment_program->Base.InputsRead & FRAG_BIT_WPOS) ? 0 : 1));
}
BEGIN_BATCH(20);
OUT_BATCH(CMD_3D_SF_STATE << 16 | (20 - 2));
OUT_BATCH(dw1);
@ -233,7 +240,7 @@ upload_sf_state(struct brw_context *brw)
OUT_BATCH(attr_overrides);
}
OUT_BATCH(dw16); /* point sprite texcoord bitmask */
OUT_BATCH(0); /* constant interp bitmask */
OUT_BATCH(dw17); /* constant interp bitmask */
OUT_BATCH(0); /* wrapshortest enables 0-7 */
OUT_BATCH(0); /* wrapshortest enables 8-15 */
ADVANCE_BATCH();