diff options
Diffstat (limited to 'src/mesa/drivers/dri/i965/brw_wm.c')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_wm.c | 42 |
1 files changed, 32 insertions, 10 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_wm.c b/src/mesa/drivers/dri/i965/brw_wm.c index b60173ed4bf..81dad4f76da 100644 --- a/src/mesa/drivers/dri/i965/brw_wm.c +++ b/src/mesa/drivers/dri/i965/brw_wm.c @@ -123,6 +123,19 @@ brw_wm_non_glsl_emit(struct brw_context *brw, struct brw_wm_compile *c) brw_wm_emit(c); } + +/** + * Return a bitfield where bit n is set if barycentric interpolation mode n + * (see enum brw_wm_barycentric_interp_mode) is needed by the fragment shader. + */ +unsigned +brw_compute_barycentric_interp_modes(void) +{ + /* At the moment the only interpolation mode we support is perspective. */ + return (1 << BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC); +} + + void brw_wm_payload_setup(struct brw_context *brw, struct brw_wm_compile *c) @@ -130,22 +143,31 @@ brw_wm_payload_setup(struct brw_context *brw, struct intel_context *intel = &brw->intel; bool uses_depth = (c->fp->program.Base.InputsRead & (1 << FRAG_ATTRIB_WPOS)) != 0; + unsigned barycentric_interp_modes = + brw_compute_barycentric_interp_modes(); + int i; if (intel->gen >= 6) { /* R0-1: masks, pixel X/Y coordinates. */ c->nr_payload_regs = 2; /* R2: only for 32-pixel dispatch.*/ - /* R3-4: perspective pixel location barycentric */ - c->nr_payload_regs += 2; - /* R5-6: perspective pixel location bary for dispatch width != 8 */ - if (c->dispatch_width == 16) { - c->nr_payload_regs += 2; + + /* R3-26: barycentric interpolation coordinates. These appear in the + * same order that they appear in the brw_wm_barycentric_interp_mode + * enum. Each set of coordinates occupies 2 registers if dispatch width + * == 8 and 4 registers if dispatch width == 16. Coordinates only + * appear if they were enabled using the "Barycentric Interpolation + * Mode" bits in WM_STATE. + */ + for (i = 0; i < BRW_WM_BARYCENTRIC_INTERP_MODE_COUNT; ++i) { + if (barycentric_interp_modes & (1 << i)) { + c->barycentric_coord_reg[i] = c->nr_payload_regs; + c->nr_payload_regs += 2; + if (c->dispatch_width == 16) { + c->nr_payload_regs += 2; + } + } } - /* R7-10: perspective centroid barycentric */ - /* R11-14: perspective sample barycentric */ - /* R15-18: linear pixel location barycentric */ - /* R19-22: linear centroid barycentric */ - /* R23-26: linear sample barycentric */ /* R27: interpolated depth if uses source depth */ if (uses_depth) { |