0,0 → 1,129 |
/* |
* Copyright 2010 Marek Olšák <maraeo@gmail.com> |
* |
* Permission is hereby granted, free of charge, to any person obtaining a |
* copy of this software and associated documentation files (the "Software"), |
* to deal in the Software without restriction, including without limitation |
* on the rights to use, copy, modify, merge, publish, distribute, sub |
* license, and/or sell copies of the Software, and to permit persons to whom |
* the Software is furnished to do so, subject to the following conditions: |
* |
* The above copyright notice and this permission notice (including the next |
* paragraph) shall be included in all copies or substantial portions of the |
* Software. |
* |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL |
* THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM, |
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE |
* USE OR OTHER DEALINGS IN THE SOFTWARE. */ |
|
/** |
* The two-sided stencil reference value fallback for r3xx-r4xx chips. |
* These chips support two-sided stencil functions but they do not support |
* a two-sided reference value. |
* |
* The functions below split every draw call which uses the two-sided |
* reference value into two draw calls -- the first one renders front faces |
* and the second renders back faces with the other reference value. |
*/ |
|
#include "r300_context.h" |
#include "r300_reg.h" |
|
struct r300_stencilref_context { |
void (*draw_vbo)(struct pipe_context *pipe, |
const struct pipe_draw_info *info); |
|
uint32_t rs_cull_mode; |
uint32_t zb_stencilrefmask; |
ubyte ref_value_front; |
}; |
|
static boolean r300_stencilref_needed(struct r300_context *r300) |
{ |
struct r300_dsa_state *dsa = (struct r300_dsa_state*)r300->dsa_state.state; |
|
return dsa->two_sided_stencil_ref || |
(dsa->two_sided && |
r300->stencil_ref.ref_value[0] != r300->stencil_ref.ref_value[1]); |
} |
|
/* Set drawing for front faces. */ |
static void r300_stencilref_begin(struct r300_context *r300) |
{ |
struct r300_stencilref_context *sr = r300->stencilref_fallback; |
struct r300_rs_state *rs = (struct r300_rs_state*)r300->rs_state.state; |
struct r300_dsa_state *dsa = (struct r300_dsa_state*)r300->dsa_state.state; |
|
/* Save state. */ |
sr->rs_cull_mode = rs->cb_main[rs->cull_mode_index]; |
sr->zb_stencilrefmask = dsa->stencil_ref_mask; |
sr->ref_value_front = r300->stencil_ref.ref_value[0]; |
|
/* We *cull* pixels, therefore no need to mask out the bits. */ |
rs->cb_main[rs->cull_mode_index] |= R300_CULL_BACK; |
|
r300_mark_atom_dirty(r300, &r300->rs_state); |
} |
|
/* Set drawing for back faces. */ |
static void r300_stencilref_switch_side(struct r300_context *r300) |
{ |
struct r300_stencilref_context *sr = r300->stencilref_fallback; |
struct r300_rs_state *rs = (struct r300_rs_state*)r300->rs_state.state; |
struct r300_dsa_state *dsa = (struct r300_dsa_state*)r300->dsa_state.state; |
|
rs->cb_main[rs->cull_mode_index] = sr->rs_cull_mode | R300_CULL_FRONT; |
dsa->stencil_ref_mask = dsa->stencil_ref_bf; |
r300->stencil_ref.ref_value[0] = r300->stencil_ref.ref_value[1]; |
|
r300_mark_atom_dirty(r300, &r300->rs_state); |
r300_mark_atom_dirty(r300, &r300->dsa_state); |
} |
|
/* Restore the original state. */ |
static void r300_stencilref_end(struct r300_context *r300) |
{ |
struct r300_stencilref_context *sr = r300->stencilref_fallback; |
struct r300_rs_state *rs = (struct r300_rs_state*)r300->rs_state.state; |
struct r300_dsa_state *dsa = (struct r300_dsa_state*)r300->dsa_state.state; |
|
/* Restore state. */ |
rs->cb_main[rs->cull_mode_index] = sr->rs_cull_mode; |
dsa->stencil_ref_mask = sr->zb_stencilrefmask; |
r300->stencil_ref.ref_value[0] = sr->ref_value_front; |
|
r300_mark_atom_dirty(r300, &r300->rs_state); |
r300_mark_atom_dirty(r300, &r300->dsa_state); |
} |
|
static void r300_stencilref_draw_vbo(struct pipe_context *pipe, |
const struct pipe_draw_info *info) |
{ |
struct r300_context *r300 = r300_context(pipe); |
struct r300_stencilref_context *sr = r300->stencilref_fallback; |
|
if (!r300_stencilref_needed(r300)) { |
sr->draw_vbo(pipe, info); |
} else { |
r300_stencilref_begin(r300); |
sr->draw_vbo(pipe, info); |
r300_stencilref_switch_side(r300); |
sr->draw_vbo(pipe, info); |
r300_stencilref_end(r300); |
} |
} |
|
void r300_plug_in_stencil_ref_fallback(struct r300_context *r300) |
{ |
r300->stencilref_fallback = CALLOC_STRUCT(r300_stencilref_context); |
|
/* Save original draw function. */ |
r300->stencilref_fallback->draw_vbo = r300->context.draw_vbo; |
|
/* Override the draw function. */ |
r300->context.draw_vbo = r300_stencilref_draw_vbo; |
} |