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/*
* 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->rs_state.dirty = TRUE;
}
/* 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->rs_state.dirty = TRUE;
r300->dsa_state.dirty = TRUE;
}
/* 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->rs_state.dirty = TRUE;
r300->dsa_state.dirty = TRUE;
}
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;
}
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