diff options
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_fs.cpp | 53 | ||||
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_fs.h | 3 |
2 files changed, 46 insertions, 10 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp index 44eb1be5108..05b6e290dee 100644 --- a/src/mesa/drivers/dri/i965/brw_fs.cpp +++ b/src/mesa/drivers/dri/i965/brw_fs.cpp @@ -1916,21 +1916,14 @@ 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 = fs_reg(this, glsl_type::uint_type); this->pixel_y = fs_reg(this, glsl_type::uint_type); this->pixel_x.type = BRW_REGISTER_TYPE_UW; this->pixel_y.type = BRW_REGISTER_TYPE_UW; - emit(BRW_OPCODE_ADD, - this->pixel_x, - fs_reg(stride(suboffset(g1_uw, 4), 2, 4, 0)), - fs_reg(brw_imm_v(0x10101010))); - emit(BRW_OPCODE_ADD, - this->pixel_y, - fs_reg(stride(suboffset(g1_uw, 5), 2, 4, 0)), - fs_reg(brw_imm_v(0x11001100))); + + emit(FS_OPCODE_PIXEL_X, this->pixel_x); + emit(FS_OPCODE_PIXEL_Y, this->pixel_y); this->current_annotation = "compute pixel deltas from v0"; if (brw->has_pln) { @@ -2154,6 +2147,40 @@ fs_visitor::generate_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_visitor::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 (c->dispatch_width == 16) { + dst = vec16(dst); + } + + /* We do this 8 or 16-wide, but since the destination is UW we + * don't do compression in the 16-wide case. + */ + brw_push_insn_state(p); + brw_set_compression_control(p, BRW_COMPRESSION_NONE); + brw_ADD(p, dst, src, deltas); + brw_pop_insn_state(p); +} + void fs_visitor::generate_linterp(fs_inst *inst, struct brw_reg dst, struct brw_reg *src) @@ -3601,6 +3628,12 @@ fs_visitor::generate_code() case FS_OPCODE_COS: generate_math(inst, dst, src); 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.h b/src/mesa/drivers/dri/i965/brw_fs.h index f792906cfe7..fd83fcb3829 100644 --- a/src/mesa/drivers/dri/i965/brw_fs.h +++ b/src/mesa/drivers/dri/i965/brw_fs.h @@ -67,6 +67,8 @@ enum fs_opcodes { FS_OPCODE_COS, FS_OPCODE_DDX, FS_OPCODE_DDY, + FS_OPCODE_PIXEL_X, + FS_OPCODE_PIXEL_Y, FS_OPCODE_CINTERP, FS_OPCODE_LINTERP, FS_OPCODE_TEX, @@ -481,6 +483,7 @@ public: void generate_code(); void generate_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); |