C++ brw_pop_insn_state函数代码示例

void
vec4_generator::generate_gs_set_write_offset(struct brw_reg dst,
        struct brw_reg src0,
        struct brw_reg src1)
{
    /* From p22 of volume 4 part 2 of the Ivy Bridge PRM (2.4.3.1 Message
     * Header: M0.3):
     *
     *     Slot 0 Offset. This field, after adding to the Global Offset field
     *     in the message descriptor, specifies the offset (in 256-bit units)
     *     from the start of the URB entry, as referenced by URB Handle 0, at
     *     which the data will be accessed.
     *
     * Similar text describes DWORD M0.4, which is slot 1 offset.
     *
     * Therefore, we want to multiply DWORDs 0 and 4 of src0 (the x components
     * of the register for geometry shader invocations 0 and 1) by the
     * immediate value in src1, and store the result in DWORDs 3 and 4 of dst.
     *
     * We can do this with the following EU instruction:
     *
     *     mul(2) dst.3<1>UD src0<8;2,4>UD src1   { Align1 WE_all }
     */
    brw_push_insn_state(p);
    brw_set_access_mode(p, BRW_ALIGN_1);
    brw_set_mask_control(p, BRW_MASK_DISABLE);
    brw_MUL(p, suboffset(stride(dst, 2, 2, 1), 3), stride(src0, 8, 2, 4),
            src1);
    brw_set_access_mode(p, BRW_ALIGN_16);
    brw_pop_insn_state(p);
}

static void do_flatshade_line( struct brw_sf_compile *c )
{
    struct brw_compile *p = &c->func;
    struct intel_context *intel = &p->brw->intel;
    struct brw_reg ip = brw_ip_reg();
    GLuint nr = brw_count_bits(c->key.attrs & VERT_RESULT_COLOR_BITS);
    GLuint jmpi = 1;

    if (!nr)
        return;

    /* Already done in clip program:
     */
    if (c->key.primitive == SF_UNFILLED_TRIS)
        return;

    if (intel->gen == 5)
        jmpi = 2;

    brw_push_insn_state(p);

    brw_MUL(p, c->pv, c->pv, brw_imm_d(jmpi*(nr+1)));
    brw_JMPI(p, ip, ip, c->pv);
    copy_colors(c, c->vert[1], c->vert[0]);

    brw_JMPI(p, ip, ip, brw_imm_ud(jmpi*nr));
    copy_colors(c, c->vert[0], c->vert[1]);

    brw_pop_insn_state(p);
}

static void emit_min(struct brw_wm_compile *c,
		struct prog_instruction *inst)
{
    struct brw_compile *p = &c->func;
    GLuint mask = inst->DstReg.WriteMask;
    struct brw_reg src0, src1, dst;
    int i;
    brw_push_insn_state(p);
    for (i = 0; i < 4; i++) {
	if (mask & (1<<i)) {
	    dst = get_dst_reg(c, inst, i, 1);
	    src0 = get_src_reg(c, &inst->SrcReg[0], i, 1);
	    src1 = get_src_reg(c, &inst->SrcReg[1], i, 1);
	    brw_set_saturate(p, (inst->SaturateMode != SATURATE_OFF) ? 1 : 0);
	    brw_MOV(p, dst, src0);
	    brw_set_saturate(p, 0);

	    brw_CMP(p, brw_null_reg(), BRW_CONDITIONAL_L, src1, src0);
	    brw_set_saturate(p, (inst->SaturateMode != SATURATE_OFF) ? 1 : 0);
	    brw_set_predicate_control(p, BRW_PREDICATE_NORMAL);
	    brw_MOV(p, dst, src1);
	    brw_set_saturate(p, 0);
	    brw_set_predicate_control_flag_value(p, 0xff);
	}
    }
    brw_pop_insn_state(p);
}

/* Kill pixel - set execution mask to zero for those pixels which
 * fail.
 */
static void emit_kil( struct brw_wm_compile *c,
		      struct brw_reg *arg0)
{
   struct brw_compile *p = &c->func;
   struct intel_context *intel = &p->brw->intel;
   struct brw_reg pixelmask;
   GLuint i, j;

   if (intel->gen >= 6)
      pixelmask = retype(brw_vec1_grf(1, 7), BRW_REGISTER_TYPE_UW);
   else
      pixelmask = retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_UW);

   for (i = 0; i < 4; i++) {
      /* Check if we've already done the comparison for this reg
       * -- common when someone does KIL TEMP.wwww.
       */
      for (j = 0; j < i; j++) {
	 if (memcmp(&arg0[j], &arg0[i], sizeof(arg0[0])) == 0)
	    break;
      }
      if (j != i)
	 continue;

      brw_push_insn_state(p);
      brw_CMP(p, brw_null_reg(), BRW_CONDITIONAL_GE, arg0[i], brw_imm_f(0));   
      brw_set_predicate_control_flag_value(p, 0xff);
      brw_set_compression_control(p, BRW_COMPRESSION_NONE);
      brw_AND(p, pixelmask, brw_flag_reg(), pixelmask);
      brw_pop_insn_state(p);
   }
}

static void fire_fb_write( struct brw_wm_compile *c,
			   GLuint base_reg,
			   GLuint nr,
			   GLuint target,
			   GLuint eot )
{
   struct brw_compile *p = &c->func;
   
   /* Pass through control information:
    */
/*  mov (8) m1.0<1>:ud   r1.0<8;8,1>:ud   { Align1 NoMask } */
   {
      brw_push_insn_state(p);
      brw_set_mask_control(p, BRW_MASK_DISABLE); /* ? */
      brw_set_compression_control(p, BRW_COMPRESSION_NONE);
      brw_MOV(p, 
	       brw_message_reg(base_reg + 1),
	       brw_vec8_grf(1, 0));
      brw_pop_insn_state(p);
   }

   /* Send framebuffer write message: */
/*  send (16) null.0<1>:uw m0               r0.0<8;8,1>:uw   0x85a04000:ud    { Align1 EOT } */
   brw_fb_WRITE(p,
		retype(vec16(brw_null_reg()), BRW_REGISTER_TYPE_UW),
		base_reg,
		retype(brw_vec8_grf(0, 0), BRW_REGISTER_TYPE_UW),
		target,		
		nr,
		0, 
		eot);
}

/* Need to use a computed jump to copy flatshaded attributes as the
 * vertices are ordered according to y-coordinate before reaching this
 * point, so the PV could be anywhere.
 */
static void do_flatshade_triangle( struct brw_sf_compile *c )
{
   struct brw_compile *p = &c->func;
   struct brw_reg ip = brw_ip_reg();
   GLuint nr = brw_count_bits(c->key.attrs & VERT_RESULT_COLOR_BITS);
   if (!nr)
      return;

   /* Already done in clip program:
    */
   if (c->key.primitive == SF_UNFILLED_TRIS)
      return;

   brw_push_insn_state(p);
   
   brw_MUL(p, c->pv, c->pv, brw_imm_ud(nr*2+1));
   brw_JMPI(p, ip, ip, c->pv);

   copy_colors(c, c->vert[1], c->vert[0]);
   copy_colors(c, c->vert[2], c->vert[0]);
   brw_JMPI(p, ip, ip, brw_imm_ud(nr*4+1));

   copy_colors(c, c->vert[0], c->vert[1]);
   copy_colors(c, c->vert[2], c->vert[1]);
   brw_JMPI(p, ip, ip, brw_imm_ud(nr*2));

   copy_colors(c, c->vert[0], c->vert[2]);
   copy_colors(c, c->vert[1], c->vert[2]);

   brw_pop_insn_state(p);
}

void emit_math1(struct brw_wm_compile *c,
		GLuint function,
		const struct brw_reg *dst,
		GLuint mask,
		const struct brw_reg *arg0)
{
   struct brw_compile *p = &c->func;
   struct intel_context *intel = &p->brw->intel;
   int dst_chan = _mesa_ffs(mask & WRITEMASK_XYZW) - 1;
   GLuint saturate = ((mask & SATURATE) ?
		      BRW_MATH_SATURATE_SATURATE :
		      BRW_MATH_SATURATE_NONE);
   struct brw_reg src;

   if (!(mask & WRITEMASK_XYZW))
      return; /* Do not emit dead code */

   assert(is_power_of_two(mask & WRITEMASK_XYZW));

   if (intel->gen >= 6 && ((arg0[0].hstride == BRW_HORIZONTAL_STRIDE_0 ||
			    arg0[0].file != BRW_GENERAL_REGISTER_FILE) ||
			   arg0[0].negate || arg0[0].abs)) {
      /* Gen6 math requires that source and dst horizontal stride be 1,
       * and that the argument be in the GRF.
       *
       * The hardware ignores source modifiers (negate and abs) on math
       * instructions, so we also move to a temp to set those up.
       */
      src = dst[dst_chan];
      brw_MOV(p, src, arg0[0]);
   } else {
      src = arg0[0];
   }

   /* Send two messages to perform all 16 operations:
    */
   brw_push_insn_state(p);
   brw_set_compression_control(p, BRW_COMPRESSION_NONE);
   brw_math(p,
	    dst[dst_chan],
	    function,
	    saturate,
	    2,
	    src,
	    BRW_MATH_DATA_VECTOR,
	    BRW_MATH_PRECISION_FULL);

   if (c->dispatch_width == 16) {
      brw_set_compression_control(p, BRW_COMPRESSION_2NDHALF);
      brw_math(p,
	       offset(dst[dst_chan],1),
	       function,
	       saturate,
	       3,
	       sechalf(src),
	       BRW_MATH_DATA_VECTOR,
	       BRW_MATH_PRECISION_FULL);
   }
   brw_pop_insn_state(p);
}

static void emit_kil(struct brw_wm_compile *c)
{
	struct brw_compile *p = &c->func;
	struct brw_reg depth = retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_UW);
	brw_push_insn_state(p);
	brw_set_mask_control(p, BRW_MASK_DISABLE);
	brw_NOT(p, c->emit_mask_reg, brw_mask_reg(1)); //IMASK
	brw_AND(p, depth, c->emit_mask_reg, depth);
	brw_pop_insn_state(p);
}

static void
gen_f0_0_MOV_GRF_GRF(struct brw_codegen *p)
{
   struct brw_reg g0 = brw_vec8_grf(0, 0);
   struct brw_reg g2 = brw_vec8_grf(2, 0);

   brw_push_insn_state(p);
   brw_set_default_predicate_control(p, true);
   brw_MOV(p, g0, g2);
   brw_pop_insn_state(p);
}

/* The handling of f0.1 vs f0.0 changes between gen6 and gen7.  Explicitly test
 * it, so that we run the fuzzing can run over all the other bits that might
 * interact with it.
 */
static void
gen_f0_1_MOV_GRF_GRF(struct brw_compile *p)
{
   struct brw_reg g0 = brw_vec8_grf(0, 0);
   struct brw_reg g2 = brw_vec8_grf(2, 0);

   brw_push_insn_state(p);
   brw_set_predicate_control(p, true);
   struct brw_instruction *mov = brw_MOV(p, g0, g2);
   mov->bits2.da1.flag_subreg_nr = 1;
   brw_pop_insn_state(p);
}

/* The handling of f0.1 vs f0.0 changes between gen6 and gen7.  Explicitly test
 * it, so that we run the fuzzing can run over all the other bits that might
 * interact with it.
 */
static void
gen_f0_1_MOV_GRF_GRF(struct brw_codegen *p)
{
   struct brw_reg g0 = brw_vec8_grf(0, 0);
   struct brw_reg g2 = brw_vec8_grf(2, 0);

   brw_push_insn_state(p);
   brw_set_default_predicate_control(p, true);
   brw_inst *mov = brw_MOV(p, g0, g2);
   brw_inst_set_flag_subreg_nr(p->devinfo, mov, 1);
   brw_pop_insn_state(p);
}

void
vec4_generator::generate_gs_set_dword_2_immed(struct brw_reg dst,
        struct brw_reg src)
{
    assert(src.file == BRW_IMMEDIATE_VALUE);

    brw_push_insn_state(p);
    brw_set_access_mode(p, BRW_ALIGN_1);
    brw_set_mask_control(p, BRW_MASK_DISABLE);
    brw_MOV(p, suboffset(vec1(dst), 2), src);
    brw_set_access_mode(p, BRW_ALIGN_16);
    brw_pop_insn_state(p);
}

/**
 * Extended math function, float[16].
 * Use 2 send instructions.
 */
void brw_math_16( struct brw_compile *p,
		  struct brw_reg dest,
		  GLuint function,
		  GLuint saturate,
		  GLuint msg_reg_nr,
		  struct brw_reg src,
		  GLuint precision )
{
   struct brw_instruction *insn;
   GLuint msg_length = (function == BRW_MATH_FUNCTION_POW) ? 2 : 1; 
   GLuint response_length = (function == BRW_MATH_FUNCTION_SINCOS) ? 2 : 1; 

   /* First instruction:
    */
   brw_push_insn_state(p);
   brw_set_predicate_control_flag_value(p, 0xff);
   brw_set_compression_control(p, BRW_COMPRESSION_NONE);

   insn = next_insn(p, BRW_OPCODE_SEND);
   insn->header.destreg__conditionalmod = msg_reg_nr;

   brw_set_dest(insn, dest);
   brw_set_src0(insn, src);
   brw_set_math_message(p->brw,
			insn, 
			msg_length, response_length, 
			function,
			BRW_MATH_INTEGER_UNSIGNED,
			precision,
			saturate,
			BRW_MATH_DATA_VECTOR);

   /* Second instruction:
    */
   insn = next_insn(p, BRW_OPCODE_SEND);
   insn->header.compression_control = BRW_COMPRESSION_2NDHALF;
   insn->header.destreg__conditionalmod = msg_reg_nr+1;

   brw_set_dest(insn, offset(dest,1));
   brw_set_src0(insn, src);
   brw_set_math_message(p->brw, 
			insn, 
			msg_length, response_length, 
			function,
			BRW_MATH_INTEGER_UNSIGNED,
			precision,
			saturate,
			BRW_MATH_DATA_VECTOR);

   brw_pop_insn_state(p);
}

static void emit_aa( struct brw_wm_compile *c,
		     struct brw_reg *arg1,
		     GLuint reg )
{
   struct brw_compile *p = &c->func;
   GLuint comp = c->aa_dest_stencil_reg / 2;
   GLuint off = c->aa_dest_stencil_reg % 2;
   struct brw_reg aa = offset(arg1[comp], off);

   brw_push_insn_state(p);
   brw_set_compression_control(p, BRW_COMPRESSION_NONE); /* ?? */
   brw_MOV(p, brw_message_reg(reg), aa);
   brw_pop_insn_state(p);
}

/**
 * Read a float[4] vector from the data port Data Cache (const buffer).
 * Location (in buffer) should be a multiple of 16.
 * Used for fetching shader constants.
 * If relAddr is true, we'll do an indirect fetch using the address register.
 */
void brw_dp_READ_4( struct brw_compile *p,
                    struct brw_reg dest,
                    GLboolean relAddr,
                    GLuint location,
                    GLuint bind_table_index )
{
   /* XXX: relAddr not implemented */
   GLuint msg_reg_nr = 1;
   {
      struct brw_reg b;
      brw_push_insn_state(p);
      brw_set_predicate_control(p, BRW_PREDICATE_NONE);
      brw_set_compression_control(p, BRW_COMPRESSION_NONE);
      brw_set_mask_control(p, BRW_MASK_DISABLE);

   /* Setup MRF[1] with location/offset into const buffer */
      b = brw_message_reg(msg_reg_nr);
      b = retype(b, BRW_REGISTER_TYPE_UD);
      /* XXX I think we're setting all the dwords of MRF[1] to 'location'.
       * when the docs say only dword[2] should be set.  Hmmm.  But it works.
       */
      brw_MOV(p, b, brw_imm_ud(location));
      brw_pop_insn_state(p);
   }

   {
      struct brw_instruction *insn = next_insn(p, BRW_OPCODE_SEND);
   
      insn->header.predicate_control = BRW_PREDICATE_NONE;
      insn->header.compression_control = BRW_COMPRESSION_NONE; 
      insn->header.destreg__conditionalmod = msg_reg_nr;
      insn->header.mask_control = BRW_MASK_DISABLE;
  
      /* cast dest to a uword[8] vector */
      dest = retype(vec8(dest), BRW_REGISTER_TYPE_UW);

      brw_set_dest(insn, dest);
      brw_set_src0(insn, brw_null_reg());

      brw_set_dp_read_message(p->brw,
			      insn,
			      bind_table_index,
			      0,  /* msg_control (0 means 1 Oword) */
			      BRW_DATAPORT_READ_MESSAGE_OWORD_BLOCK_READ, /* msg_type */
			      0, /* source cache = data cache */
			      1, /* msg_length */
			      1, /* response_length (1 Oword) */
			      0); /* eot */
   }
}