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i965/fs: Add support for computing pixel_[xy] in 16-wide.

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Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Eric Anholt
2011-03-21 15:54:18 -07:00
parent 2ac1cb8b83
commit 141b0bb277
2 changed files with 46 additions and 10 deletions
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53
src/mesa/drivers/dri/i965/brw_fs.cpp
View File

@@ -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;

3
src/mesa/drivers/dri/i965/brw_fs.h
View File

@@ -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);