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i956: Fix the old FP path fragment position setup on gen6. 

Fixes fp-arb-fragment-coord-conventions-none
This commit is contained in:
Eric Anholt 2010-12-13 12:15:21 -08:00
parent 7cec7bf56c
commit 5fbd8da8df
1 changed files with 20 additions and 18 deletions
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38
src/mesa/drivers/dri/i965/brw_wm_emit.c
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@ -219,43 +219,45 @@ void emit_wpos_xy(struct brw_wm_compile *c,
const struct brw_reg *arg0)
{
struct brw_compile *p = &c->func;
struct intel_context *intel = &p->brw->intel;
struct brw_reg delta_x = retype(arg0[0], BRW_REGISTER_TYPE_W);
struct brw_reg delta_y = retype(arg0[1], BRW_REGISTER_TYPE_W);
if (mask & WRITEMASK_X) {
if (intel->gen >= 6) {
struct brw_reg delta_x_f = retype(delta_x, BRW_REGISTER_TYPE_F);
brw_MOV(p, delta_x_f, delta_x);
delta_x = delta_x_f;
}
if (c->fp->program.PixelCenterInteger) {
/* X' = X */
brw_MOV(p,
dst[0],
retype(arg0[0], BRW_REGISTER_TYPE_W));
brw_MOV(p, dst[0], delta_x);
} else {
/* X' = X + 0.5 */
brw_ADD(p,
dst[0],
retype(arg0[0], BRW_REGISTER_TYPE_W),
brw_imm_f(0.5));
brw_ADD(p, dst[0], delta_x, brw_imm_f(0.5));
}
}
if (mask & WRITEMASK_Y) {
if (intel->gen >= 6) {
struct brw_reg delta_y_f = retype(delta_y, BRW_REGISTER_TYPE_F);
brw_MOV(p, delta_y_f, delta_y);
delta_y = delta_y_f;
}
if (c->fp->program.OriginUpperLeft) {
if (c->fp->program.PixelCenterInteger) {
/* Y' = Y */
brw_MOV(p,
dst[1],
retype(arg0[1], BRW_REGISTER_TYPE_W));
brw_MOV(p, dst[1], delta_y);
} else {
/* Y' = Y + 0.5 */
brw_ADD(p,
dst[1],
retype(arg0[1], BRW_REGISTER_TYPE_W),
brw_imm_f(0.5));
brw_ADD(p, dst[1], delta_y, brw_imm_f(0.5));
}
} else {
float center_offset = c->fp->program.PixelCenterInteger ? 0.0 : 0.5;
/* Y' = (height - 1) - Y + center */
brw_ADD(p,
dst[1],
negate(retype(arg0[1], BRW_REGISTER_TYPE_W)),
brw_ADD(p, dst[1], negate(delta_y),
brw_imm_f(c->key.drawable_height - 1 + center_offset));
}
}