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  1. /*
  2.  * Copyright 2010 Marek Olšák <maraeo@gmail.com>
  3.  *
  4.  * Permission is hereby granted, free of charge, to any person obtaining a
  5.  * copy of this software and associated documentation files (the "Software"),
  6.  * to deal in the Software without restriction, including without limitation
  7.  * on the rights to use, copy, modify, merge, publish, distribute, sub
  8.  * license, and/or sell copies of the Software, and to permit persons to whom
  9.  * the Software is furnished to do so, subject to the following conditions:
  10.  *
  11.  * The above copyright notice and this permission notice (including the next
  12.  * paragraph) shall be included in all copies or substantial portions of the
  13.  * Software.
  14.  *
  15.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17.  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  18.  * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  19.  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  20.  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  21.  * USE OR OTHER DEALINGS IN THE SOFTWARE. */
  22.  
  23. /**
  24.  * The two-sided stencil reference value fallback for r3xx-r4xx chips.
  25.  * These chips support two-sided stencil functions but they do not support
  26.  * a two-sided reference value.
  27.  *
  28.  * The functions below split every draw call which uses the two-sided
  29.  * reference value into two draw calls -- the first one renders front faces
  30.  * and the second renders back faces with the other reference value.
  31.  */
  32.  
  33. #include "r300_context.h"
  34. #include "r300_reg.h"
  35.  
  36. struct r300_stencilref_context {
  37.     void (*draw_vbo)(struct pipe_context *pipe,
  38.                      const struct pipe_draw_info *info);
  39.  
  40.     uint32_t rs_cull_mode;
  41.     uint32_t zb_stencilrefmask;
  42.     ubyte ref_value_front;
  43. };
  44.  
  45. static boolean r300_stencilref_needed(struct r300_context *r300)
  46. {
  47.     struct r300_dsa_state *dsa = (struct r300_dsa_state*)r300->dsa_state.state;
  48.  
  49.     return dsa->two_sided_stencil_ref ||
  50.            (dsa->two_sided &&
  51.             r300->stencil_ref.ref_value[0] != r300->stencil_ref.ref_value[1]);
  52. }
  53.  
  54. /* Set drawing for front faces. */
  55. static void r300_stencilref_begin(struct r300_context *r300)
  56. {
  57.     struct r300_stencilref_context *sr = r300->stencilref_fallback;
  58.     struct r300_rs_state *rs = (struct r300_rs_state*)r300->rs_state.state;
  59.     struct r300_dsa_state *dsa = (struct r300_dsa_state*)r300->dsa_state.state;
  60.  
  61.     /* Save state. */
  62.     sr->rs_cull_mode = rs->cb_main[rs->cull_mode_index];
  63.     sr->zb_stencilrefmask = dsa->stencil_ref_mask;
  64.     sr->ref_value_front = r300->stencil_ref.ref_value[0];
  65.  
  66.     /* We *cull* pixels, therefore no need to mask out the bits. */
  67.     rs->cb_main[rs->cull_mode_index] |= R300_CULL_BACK;
  68.  
  69.     r300_mark_atom_dirty(r300, &r300->rs_state);
  70. }
  71.  
  72. /* Set drawing for back faces. */
  73. static void r300_stencilref_switch_side(struct r300_context *r300)
  74. {
  75.     struct r300_stencilref_context *sr = r300->stencilref_fallback;
  76.     struct r300_rs_state *rs = (struct r300_rs_state*)r300->rs_state.state;
  77.     struct r300_dsa_state *dsa = (struct r300_dsa_state*)r300->dsa_state.state;
  78.  
  79.     rs->cb_main[rs->cull_mode_index] = sr->rs_cull_mode | R300_CULL_FRONT;
  80.     dsa->stencil_ref_mask = dsa->stencil_ref_bf;
  81.     r300->stencil_ref.ref_value[0] = r300->stencil_ref.ref_value[1];
  82.  
  83.     r300_mark_atom_dirty(r300, &r300->rs_state);
  84.     r300_mark_atom_dirty(r300, &r300->dsa_state);
  85. }
  86.  
  87. /* Restore the original state. */
  88. static void r300_stencilref_end(struct r300_context *r300)
  89. {
  90.     struct r300_stencilref_context *sr = r300->stencilref_fallback;
  91.     struct r300_rs_state *rs = (struct r300_rs_state*)r300->rs_state.state;
  92.     struct r300_dsa_state *dsa = (struct r300_dsa_state*)r300->dsa_state.state;
  93.  
  94.     /* Restore state. */
  95.     rs->cb_main[rs->cull_mode_index] = sr->rs_cull_mode;
  96.     dsa->stencil_ref_mask = sr->zb_stencilrefmask;
  97.     r300->stencil_ref.ref_value[0] = sr->ref_value_front;
  98.  
  99.     r300_mark_atom_dirty(r300, &r300->rs_state);
  100.     r300_mark_atom_dirty(r300, &r300->dsa_state);
  101. }
  102.  
  103. static void r300_stencilref_draw_vbo(struct pipe_context *pipe,
  104.                                      const struct pipe_draw_info *info)
  105. {
  106.     struct r300_context *r300 = r300_context(pipe);
  107.     struct r300_stencilref_context *sr = r300->stencilref_fallback;
  108.  
  109.     if (!r300_stencilref_needed(r300)) {
  110.         sr->draw_vbo(pipe, info);
  111.     } else {
  112.         r300_stencilref_begin(r300);
  113.         sr->draw_vbo(pipe, info);
  114.         r300_stencilref_switch_side(r300);
  115.         sr->draw_vbo(pipe, info);
  116.         r300_stencilref_end(r300);
  117.     }
  118. }
  119.  
  120. void r300_plug_in_stencil_ref_fallback(struct r300_context *r300)
  121. {
  122.     r300->stencilref_fallback = CALLOC_STRUCT(r300_stencilref_context);
  123.  
  124.     /* Save original draw function. */
  125.     r300->stencilref_fallback->draw_vbo = r300->context.draw_vbo;
  126.  
  127.     /* Override the draw function. */
  128.     r300->context.draw_vbo = r300_stencilref_draw_vbo;
  129. }
  130.