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st/mesa: negate DDY to match GL semantics

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This fixes the regression from commit 884007546c
Fixes bug 25456 (piglit derivs regression).
This commit is contained in:
Brian Paul 2009-12-07 09:00:57 -07:00
parent 8468234bfa
commit 8ce1713443
1 changed files with 20 additions and 1 deletions
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21
src/mesa/state_tracker/st_mesa_to_tgsi.c
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@ -396,6 +396,23 @@ static void emit_swz( struct st_translate *t,
}
/**
* Negate the value of DDY to match GL semantics where (0,0) is the
* lower-left corner of the window.
* Note that the GL_ARB_fragment_coord_conventions extension will
* effect this someday.
*/
static void emit_ddy( struct st_translate *t,
struct ureg_dst dst,
const struct prog_src_register *SrcReg )
{
struct ureg_program *ureg = t->ureg;
struct ureg_src src = translate_src( t, SrcReg );
if(1) src = ureg_negate( src );
ureg_DDY( ureg, dst, src );
}
static unsigned
translate_opcode( unsigned op )
@ -619,7 +636,9 @@ compile_instruction(
ureg_MOV( ureg, dst[0], ureg_imm1f(ureg, 0.5) );
break;
case OPCODE_DDY:
emit_ddy( t, dst[0], &inst->SrcReg[0] );
break;
default:
ureg_insn( ureg,