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5564 serge 1 
/*
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 * Copyright 2010 Marek Olšák
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a
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 * copy of this software and associated documentation files (the "Software"),
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 * to deal in the Software without restriction, including without limitation
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 * on the rights to use, copy, modify, merge, publish, distribute, sub
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 * license, and/or sell copies of the Software, and to permit persons to whom
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 * the Software is furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice (including the next
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 * paragraph) shall be included in all copies or substantial portions of the
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 * Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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 * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
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 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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 * USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**
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 * The two-sided stencil reference value fallback for r3xx-r4xx chips.
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 * These chips support two-sided stencil functions but they do not support
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 * a two-sided reference value.
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 *
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 * The functions below split every draw call which uses the two-sided
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 * reference value into two draw calls -- the first one renders front faces
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 * and the second renders back faces with the other reference value.
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 */
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#include "r300_context.h"
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#include "r300_reg.h"
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struct r300_stencilref_context {
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    void (*draw_vbo)(struct pipe_context *pipe,
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                     const struct pipe_draw_info *info);
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    uint32_t rs_cull_mode;
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    uint32_t zb_stencilrefmask;
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    ubyte ref_value_front;
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};
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static boolean r300_stencilref_needed(struct r300_context *r300)
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{
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    struct r300_dsa_state *dsa = (struct r300_dsa_state*)r300->dsa_state.state;
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    return dsa->two_sided_stencil_ref ||
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           (dsa->two_sided &&
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            r300->stencil_ref.ref_value[0] != r300->stencil_ref.ref_value[1]);
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}
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/* Set drawing for front faces. */
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static void r300_stencilref_begin(struct r300_context *r300)
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{
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    struct r300_stencilref_context *sr = r300->stencilref_fallback;
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    struct r300_rs_state *rs = (struct r300_rs_state*)r300->rs_state.state;
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    struct r300_dsa_state *dsa = (struct r300_dsa_state*)r300->dsa_state.state;
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    /* Save state. */
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    sr->rs_cull_mode = rs->cb_main[rs->cull_mode_index];
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    sr->zb_stencilrefmask = dsa->stencil_ref_mask;
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    sr->ref_value_front = r300->stencil_ref.ref_value[0];
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    /* We *cull* pixels, therefore no need to mask out the bits. */
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    rs->cb_main[rs->cull_mode_index] |= R300_CULL_BACK;
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    r300_mark_atom_dirty(r300, &r300->rs_state);
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}
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/* Set drawing for back faces. */
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static void r300_stencilref_switch_side(struct r300_context *r300)
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{
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    struct r300_stencilref_context *sr = r300->stencilref_fallback;
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    struct r300_rs_state *rs = (struct r300_rs_state*)r300->rs_state.state;
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    struct r300_dsa_state *dsa = (struct r300_dsa_state*)r300->dsa_state.state;
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    rs->cb_main[rs->cull_mode_index] = sr->rs_cull_mode | R300_CULL_FRONT;
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    dsa->stencil_ref_mask = dsa->stencil_ref_bf;
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    r300->stencil_ref.ref_value[0] = r300->stencil_ref.ref_value[1];
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    r300_mark_atom_dirty(r300, &r300->rs_state);
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    r300_mark_atom_dirty(r300, &r300->dsa_state);
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}
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/* Restore the original state. */
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static void r300_stencilref_end(struct r300_context *r300)
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{
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    struct r300_stencilref_context *sr = r300->stencilref_fallback;
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    struct r300_rs_state *rs = (struct r300_rs_state*)r300->rs_state.state;
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    struct r300_dsa_state *dsa = (struct r300_dsa_state*)r300->dsa_state.state;
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    /* Restore state. */
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    rs->cb_main[rs->cull_mode_index] = sr->rs_cull_mode;
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    dsa->stencil_ref_mask = sr->zb_stencilrefmask;
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    r300->stencil_ref.ref_value[0] = sr->ref_value_front;
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    r300_mark_atom_dirty(r300, &r300->rs_state);
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    r300_mark_atom_dirty(r300, &r300->dsa_state);
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}
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static void r300_stencilref_draw_vbo(struct pipe_context *pipe,
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                                     const struct pipe_draw_info *info)
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{
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    struct r300_context *r300 = r300_context(pipe);
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    struct r300_stencilref_context *sr = r300->stencilref_fallback;
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    if (!r300_stencilref_needed(r300)) {
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        sr->draw_vbo(pipe, info);
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    } else {
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        r300_stencilref_begin(r300);
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        sr->draw_vbo(pipe, info);
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        r300_stencilref_switch_side(r300);
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        sr->draw_vbo(pipe, info);
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        r300_stencilref_end(r300);
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    }
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}
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void r300_plug_in_stencil_ref_fallback(struct r300_context *r300)
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{
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    r300->stencilref_fallback = CALLOC_STRUCT(r300_stencilref_context);
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    /* Save original draw function. */
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    r300->stencilref_fallback->draw_vbo = r300->context.draw_vbo;
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    /* Override the draw function. */
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    r300->context.draw_vbo = r300_stencilref_draw_vbo;
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}