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i965: report correct sample positions

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From low to high bits, the sample positions are packed y0,x0,y1,x1...

Fixes arb_texture_multisample-sample-position piglit.

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
This commit is contained in:
Chris Forbes 2013-04-24 06:44:02 +12:00
parent 49a7624973
commit 447bf1fb52
1 changed files with 4 additions and 4 deletions
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8
src/mesa/drivers/dri/i965/gen6_multisample_state.c
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@ -83,14 +83,14 @@ gen6_get_sample_position(struct gl_context *ctx,
break; break;
case 4: { case 4: {
uint8_t val = (uint8_t)(sample_positions_4x[0] >> (8*index)); uint8_t val = (uint8_t)(sample_positions_4x[0] >> (8*index));
result[0] = (val & 0xf) / 16.0f; result[0] = ((val >> 4) & 0xf) / 16.0f;
result[1] = ((val >> 4) & 0xf) / 16.0f; result[1] = (val & 0xf) / 16.0f;
break; break;
} }
case 8: { case 8: {
uint8_t val = (uint8_t)(sample_positions_8x[index>>2] >> (8*(index & 3))); uint8_t val = (uint8_t)(sample_positions_8x[index>>2] >> (8*(index & 3)));
result[0] = (val & 0xf) / 16.0f; result[0] = ((val >> 4) & 0xf) / 16.0f;
result[1] = ((val >> 4) & 0xf) / 16.0f; result[1] = (val & 0xf) / 16.0f;
break; break;
} }
default: default: