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r300g: enhance ZTOP conditions

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This commit is contained in:
Marek Olšák 2009-12-05 01:27:59 +01:00 • committed by Corbin Simpson
parent c574f515f0
commit 7091afed78
1 changed files with 31 additions and 6 deletions
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37
src/gallium/drivers/r300/r300_state_derived.c
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@ -462,6 +462,31 @@ static void r300_update_derived_shader_state(struct r300_context* r300)
r300->dirty_state |= R300_NEW_RS_BLOCK;
}
static boolean r300_dsa_writes_depth_stencil(struct r300_dsa_state* dsa)
{
/* We are interested only in the cases when a new depth or stencil value
* can be written and changed. */
/* We might optionally check for [Z func: never] and inspect the stencil
* state in a similar fashion, but it's not terribly important. */
return (dsa->z_buffer_control & R300_Z_WRITE_ENABLE)
||
(dsa->stencil_ref_mask & R300_STENCILWRITEMASK_MASK)
||
((dsa->z_buffer_control & R500_STENCIL_REFMASK_FRONT_BACK) &&
(dsa->stencil_ref_bf & R300_STENCILWRITEMASK_MASK));
}
static boolean r300_dsa_alpha_test_enabled(struct r300_dsa_state* dsa)
{
/* We are interested only in the cases when alpha testing can kill
* a fragment. */
uint32_t af = dsa->alpha_function;
return (af & R300_FG_ALPHA_FUNC_ENABLE) &&
(af & R300_FG_ALPHA_FUNC_ALWAYS) != R300_FG_ALPHA_FUNC_ALWAYS;
}
static void r300_update_ztop(struct r300_context* r300)
{
r300->ztop_state.z_buffer_top = R300_ZTOP_ENABLE;
@ -484,13 +509,13 @@ static void r300_update_ztop(struct r300_context* r300)
*
* ~C.
*/
if (r300->dsa_state->alpha_function) {
if (r300->query_current ||
r300_fragment_shader_writes_depth(r300->fs)) {
r300->ztop_state.z_buffer_top = R300_ZTOP_DISABLE;
} else if (r300->fs->info.uses_kill) {
r300->ztop_state.z_buffer_top = R300_ZTOP_DISABLE;
} else if (r300_fragment_shader_writes_depth(r300->fs)) {
r300->ztop_state.z_buffer_top = R300_ZTOP_DISABLE;
} else if (r300->query_current) {
} else if (r300_dsa_writes_depth_stencil(r300->dsa_state) &&
(r300->fs->info.uses_kill ||
r300_dsa_alpha_test_enabled(r300->dsa_state))) {
r300->ztop_state.z_buffer_top = R300_ZTOP_DISABLE;
}
}