diff options
Diffstat (limited to 'src/mesa/drivers/dri/i965/brw_wm_fp.c')
-rw-r--r-- | src/mesa/drivers/dri/i965/brw_wm_fp.c | 62 |
1 files changed, 54 insertions, 8 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_wm_fp.c b/src/mesa/drivers/dri/i965/brw_wm_fp.c index 533be3858e..a7f5f1b9a2 100644 --- a/src/mesa/drivers/dri/i965/brw_wm_fp.c +++ b/src/mesa/drivers/dri/i965/brw_wm_fp.c @@ -58,7 +58,8 @@ static const char *wm_opcode_strings[] = { "PINTERP", "CINTERP", "WPOSXY", - "FB_WRITE" + "FB_WRITE", + "FRONTFACING", }; #if 0 @@ -313,18 +314,13 @@ static void emit_interp( struct brw_wm_compile *c, struct prog_dst_register dst = dst_reg(PROGRAM_INPUT, idx); struct prog_src_register interp = src_reg(PROGRAM_PAYLOAD, idx); struct prog_src_register deltas = get_delta_xy(c); - struct prog_src_register arg2; - GLuint opcode; - + /* Need to use PINTERP on attributes which have been * multiplied by 1/W in the SF program, and LINTERP on those * which have not: */ switch (idx) { case FRAG_ATTRIB_WPOS: - opcode = WM_LINTERP; - arg2 = src_undef(); - /* Have to treat wpos.xy specially: */ emit_op(c, @@ -345,7 +341,7 @@ static void emit_interp( struct brw_wm_compile *c, 0, interp, deltas, - arg2); + src_undef()); break; case FRAG_ATTRIB_COL0: case FRAG_ATTRIB_COL1: @@ -368,6 +364,56 @@ static void emit_interp( struct brw_wm_compile *c, src_undef()); } break; + case FRAG_ATTRIB_FOGC: + /* The FOGC input is really special. When a program uses glFogFragCoord, + * the results returned are supposed to be (f,0,0,1). But for Mesa GLSL, + * the glFrontFacing and glPointCoord values are also stashed in FOGC. + * So, write the interpolated fog value to X, then either 0, 1, or the + * stashed values to Y, Z, W. Note that this means that + * glFogFragCoord.yzw can be wrong in those cases! + */ + + /* Interpolate the fog coordinate */ + emit_op(c, + WM_PINTERP, + dst_mask(dst, WRITEMASK_X), + 0, + interp, + deltas, + get_pixel_w(c)); + + /* Move the front facing value into FOGC.y if it's needed. */ + if (c->fp->program.UsesFrontFacing) { + emit_op(c, + WM_FRONTFACING, + dst_mask(dst, WRITEMASK_Y), + 0, + src_undef(), + src_undef(), + src_undef()); + } else { + emit_op(c, + OPCODE_MOV, + dst_mask(dst, WRITEMASK_Y), + 0, + src_swizzle1(interp, SWIZZLE_ZERO), + src_undef(), + src_undef()); + } + + /* Should do the PointCoord thing here. */ + emit_op(c, + OPCODE_MOV, + dst_mask(dst, WRITEMASK_ZW), + 0, + src_swizzle(interp, + SWIZZLE_ZERO, + SWIZZLE_ZERO, + SWIZZLE_ZERO, + SWIZZLE_ONE), + src_undef(), + src_undef()); + break; default: emit_op(c, WM_PINTERP, |