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vc4: Initialize undefined temporaries to 0.

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Under the simulator, reading registers before writing them triggers an
assertion failure.  c->undef gets treated as r0, which will usually be
written, but not if it's used in the first instruction.  We should
definitely not be aborting in this case, and return some sort of undefined
value instead.

Fixes glsl-user-varying-ff.
This commit is contained in:
Eric Anholt 2014-10-09 17:49:23 +02:00
parent 4ce11de4ae
commit 5cfab07639
1 changed files with 6 additions and 1 deletions
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7
src/gallium/drivers/vc4/vc4_program.c
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@ -957,10 +957,15 @@ emit_tgsi_declaration(struct vc4_compile *c,
struct tgsi_full_declaration *decl)
{
switch (decl->Declaration.File) {
case TGSI_FILE_TEMPORARY:
case TGSI_FILE_TEMPORARY: {
uint32_t old_size = c->temps_array_size;
resize_qreg_array(c, &c->temps, &c->temps_array_size,
(decl->Range.Last + 1) * 4);
for (int i = old_size; i < c->temps_array_size; i++)
c->temps[i] = qir_uniform_ui(c, 0);
break;
}
case TGSI_FILE_INPUT:
resize_qreg_array(c, &c->inputs, &c->inputs_array_size,