i965/fs: Emit ADDs for gl_FragCoord, not virtual opcodes.

These were used only on Gen4 and 5. emit_interpolation_setup_gen6() emits
ADDs directly. The virtual opcodes weren't providing anything useful.

I'm going to repurpose these opcodes, so deleting and readding them makes
it simpler to see what's going on.

Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>

5 files changed, 8 insertions, 51 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_defines.h b/src/mesa/drivers/dri/i965/brw_defines.h
index a97a944..5962b00 100644
--- a/src/mesa/drivers/dri/i965/brw_defines.h
+++ b/src/mesa/drivers/dri/i965/brw_defines.h
@@ -923,8 +923,6 @@ enum opcode {
     */
    FS_OPCODE_DDY_COARSE,
    FS_OPCODE_DDY_FINE,
-   FS_OPCODE_PIXEL_X,
-   FS_OPCODE_PIXEL_Y,
    FS_OPCODE_CINTERP,
    FS_OPCODE_LINTERP,
    FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD,
diff --git a/src/mesa/drivers/dri/i965/brw_fs.h b/src/mesa/drivers/dri/i965/brw_fs.h
index 32063f0..d625d91 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.h
+++ b/src/mesa/drivers/dri/i965/brw_fs.h
@@ -557,7 +557,6 @@ private:
    void generate_fb_write(fs_inst *inst, struct brw_reg payload);
    void generate_urb_write(fs_inst *inst, struct brw_reg payload);
    void generate_blorp_fb_write(fs_inst *inst);
-   void generate_pixel_xy(struct brw_reg dst, bool is_x);
    void generate_linterp(fs_inst *inst, struct brw_reg dst,
 			 struct brw_reg *src);
    void generate_tex(fs_inst *inst, struct brw_reg dst, struct brw_reg src,
diff --git a/src/mesa/drivers/dri/i965/brw_fs_generator.cpp b/src/mesa/drivers/dri/i965/brw_fs_generator.cpp
index 397d825..353f35a 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_generator.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_generator.cpp
@@ -387,40 +387,6 @@ fs_generator::generate_blorp_fb_write(fs_inst *inst)
                 inst->header_present);
 }
 
-/* Computes the integer pixel x,y values from the origin.
- *
- * This is the basis of gl_FragCoord computation, but is also used
- * pre-gen6 for computing the deltas from v0 for computing
- * interpolation.
- */
-void
-fs_generator::generate_pixel_xy(struct brw_reg dst, bool is_x)
-{
-   struct brw_reg g1_uw = retype(brw_vec1_grf(1, 0), BRW_REGISTER_TYPE_UW);
-   struct brw_reg src;
-   struct brw_reg deltas;
-
-   if (is_x) {
-      src = stride(suboffset(g1_uw, 4), 2, 4, 0);
-      deltas = brw_imm_v(0x10101010);
-   } else {
-      src = stride(suboffset(g1_uw, 5), 2, 4, 0);
-      deltas = brw_imm_v(0x11001100);
-   }
-
-   if (dispatch_width == 16) {
-      dst = vec16(dst);
-   }
-
-   /* We do this SIMD8 or SIMD16, but since the destination is UW we
-    * don't do compression in the SIMD16 case.
-    */
-   brw_push_insn_state(p);
-   brw_set_default_compression_control(p, BRW_COMPRESSION_NONE);
-   brw_ADD(p, dst, src, deltas);
-   brw_pop_insn_state(p);
-}
-
 void
 fs_generator::generate_linterp(fs_inst *inst,
 			     struct brw_reg dst, struct brw_reg *src)
@@ -1949,12 +1915,6 @@ fs_generator::generate_code(const cfg_t *cfg, int dispatch_width)
 	    generate_math_gen4(inst, dst, src[0]);
 	 }
 	 break;
-      case FS_OPCODE_PIXEL_X:
-	 generate_pixel_xy(dst, true);
-	 break;
-      case FS_OPCODE_PIXEL_Y:
-	 generate_pixel_xy(dst, false);
-	 break;
       case FS_OPCODE_CINTERP:
 	 brw_MOV(p, dst, src[0]);
 	 break;
diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
index 4e99366..98c6988 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
@@ -3428,14 +3428,19 @@ fs_visitor::interp_reg(int location, int channel)
 void
 fs_visitor::emit_interpolation_setup_gen4()
 {
+   struct brw_reg g1_uw = retype(brw_vec1_grf(1, 0), BRW_REGISTER_TYPE_UW);
+
    this->current_annotation = "compute pixel centers";
    this->pixel_x = vgrf(glsl_type::uint_type);
    this->pixel_y = vgrf(glsl_type::uint_type);
    this->pixel_x.type = BRW_REGISTER_TYPE_UW;
    this->pixel_y.type = BRW_REGISTER_TYPE_UW;
-
-   emit(FS_OPCODE_PIXEL_X, this->pixel_x);
-   emit(FS_OPCODE_PIXEL_Y, this->pixel_y);
+   emit(ADD(this->pixel_x,
+            fs_reg(stride(suboffset(g1_uw, 4), 2, 4, 0)),
+            fs_reg(brw_imm_v(0x10101010))));
+   emit(ADD(this->pixel_y,
+            fs_reg(stride(suboffset(g1_uw, 5), 2, 4, 0)),
+            fs_reg(brw_imm_v(0x11001100))));
 
    this->current_annotation = "compute pixel deltas from v0";
    if (brw->has_pln) {
diff --git a/src/mesa/drivers/dri/i965/brw_shader.cpp b/src/mesa/drivers/dri/i965/brw_shader.cpp
index 0d6ac0c..d0d5cf9 100644
--- a/src/mesa/drivers/dri/i965/brw_shader.cpp
+++ b/src/mesa/drivers/dri/i965/brw_shader.cpp
@@ -512,11 +512,6 @@ brw_instruction_name(enum opcode op)
    case FS_OPCODE_DDY_FINE:
       return "ddy_fine";
 
-   case FS_OPCODE_PIXEL_X:
-      return "pixel_x";
-   case FS_OPCODE_PIXEL_Y:
-      return "pixel_y";
-
    case FS_OPCODE_CINTERP:
       return "cinterp";
    case FS_OPCODE_LINTERP: