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Initial implementation of high-level flow-control instructions.

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IF/ELSE/ENDIF and BEGIN_LOOP/END_LOOP/BREAK instructions seem to work.
Disabled by default though until better tested.
Implemented IR_NOT, but needs optimization.
This commit is contained in:
Brian
2007-02-05 15:00:07 -07:00
parent 5db088d70f
commit cf92c72797
5 changed files with 189 additions and 13 deletions
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38
src/mesa/swrast/s_fragprog.c
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@@ -625,7 +625,7 @@ execute_program( GLcontext *ctx,
GLuint column )
{
const GLuint MAX_EXEC = 10000;
GLuint pc, total = 0;
GLint pc, total = 0, loopDepth = 0;
if (DEBUG_FRAG) {
printf("execute fragment program --------------------\n");
@@ -642,7 +642,7 @@ execute_program( GLcontext *ctx,
}
if (DEBUG_FRAG) {
_mesa_print_instruction(inst);
_mesa_print_instruction(inst, 0);
}
switch (inst->Opcode) {
@@ -676,8 +676,13 @@ execute_program( GLcontext *ctx,
}
break;
case OPCODE_BGNLOOP: /* begin loop */
loopDepth++;
break;
case OPCODE_ENDLOOP: /* end loop */
loopDepth--;
assert(loopDepth >= 0);
/* subtract 1 here since pc is incremented by for(pc) loop */
pc = inst->BranchTarget - 1; /* go to matching BNGLOOP */
break;
case OPCODE_BGNSUB: /* begin subroutine */
break;
@@ -701,7 +706,19 @@ execute_program( GLcontext *ctx,
}
break;
case OPCODE_BRK: /* break out of loop */
/* assert inside loop */
if (loopDepth == 0) {
_mesa_problem(ctx, "BRK not inside a loop");
}
/* search for OPCODE_ENDLOOP */
do {
pc++;
inst = program->Base.Instructions + pc;
if (inst->Opcode == OPCODE_ENDLOOP) {
loopDepth--;
assert(loopDepth >= 0);
break;
}
} while (pc < maxInst);
break;
case OPCODE_CAL: /* Call subroutine */
{
@@ -880,20 +897,25 @@ execute_program( GLcontext *ctx,
/* do if-clause (just continue execution) */
}
else {
/* do else-clause, or go to endif */
/* search for else-clause or endif */
/* XXX could encode location of the else/endif statement
* in the IF instruction to avoid searching...
*/
GLint ifDepth = 1;
do {
pc++;
inst = program->Base.Instructions + pc;
if (inst->Opcode == OPCODE_END) {
/* mal-formed program! */
abort();
_mesa_problem(ctx, "END found before ELSE/ENDIF");
return GL_FALSE;
}
else if (inst->Opcode == OPCODE_IF) {
/* nested if */
ifDepth++;
}
else if (inst->Opcode == OPCODE_ELSE) {
if (ifDepth == 0) {
if (ifDepth == 1) {
/* ok, continue normal execution */
break;
}
@@ -1335,6 +1357,10 @@ execute_program( GLcontext *ctx,
result[2] = (a[2] > b[2]) ? 1.0F : 0.0F;
result[3] = (a[3] > b[3]) ? 1.0F : 0.0F;
store_vector4( inst, machine, result );
if (DEBUG_FRAG) {
printf("SGT %g %g %g %g\n",
result[0], result[1], result[2], result[3]);
}
}
break;
case OPCODE_SIN: