st_atom_depth.c revision a6c0c5532f7bfa50ae54c36cf4d74ad4b9f926f8 
1/**************************************************************************
2 *
3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28 /*
29  * Authors:
30  *   Keith Whitwell <keith@tungstengraphics.com>
31  *   Brian Paul
32  *   Zack  Rusin
33  */
34
35
36#include "st_context.h"
37#include "st_cache.h"
38#include "st_atom.h"
39#include "pipe/p_context.h"
40#include "pipe/p_defines.h"
41
42
43/**
44 * Convert GLenum stencil func tokens to pipe tokens.
45 */
46static GLuint
47gl_stencil_func_to_sp(GLenum func)
48{
49   /* Same values, just biased */
50   assert(PIPE_FUNC_NEVER == GL_NEVER - GL_NEVER);
51   assert(PIPE_FUNC_LESS == GL_LESS - GL_NEVER);
52   assert(PIPE_FUNC_EQUAL == GL_EQUAL - GL_NEVER);
53   assert(PIPE_FUNC_LEQUAL == GL_LEQUAL - GL_NEVER);
54   assert(PIPE_FUNC_GREATER == GL_GREATER - GL_NEVER);
55   assert(PIPE_FUNC_NOTEQUAL == GL_NOTEQUAL - GL_NEVER);
56   assert(PIPE_FUNC_GEQUAL == GL_GEQUAL - GL_NEVER);
57   assert(PIPE_FUNC_ALWAYS == GL_ALWAYS - GL_NEVER);
58   assert(func >= GL_NEVER);
59   assert(func <= GL_ALWAYS);
60   return func - GL_NEVER;
61}
62
63
64/**
65 * Convert GLenum stencil op tokens to pipe tokens.
66 */
67static GLuint
68gl_stencil_op_to_sp(GLenum func)
69{
70   switch (func) {
71   case GL_KEEP:
72      return PIPE_STENCIL_OP_KEEP;
73   case GL_ZERO:
74      return PIPE_STENCIL_OP_ZERO;
75   case GL_REPLACE:
76      return PIPE_STENCIL_OP_REPLACE;
77   case GL_INCR:
78      return PIPE_STENCIL_OP_INCR;
79   case GL_DECR:
80      return PIPE_STENCIL_OP_DECR;
81   case GL_INCR_WRAP:
82      return PIPE_STENCIL_OP_INCR_WRAP;
83   case GL_DECR_WRAP:
84      return PIPE_STENCIL_OP_DECR_WRAP;
85   case GL_INVERT:
86      return PIPE_STENCIL_OP_INVERT;
87   default:
88      assert("invalid GL token in gl_stencil_op_to_sp()" == NULL);
89      return 0;
90   }
91}
92
93/**
94 * Convert GLenum depth func tokens to pipe tokens.
95 */
96static GLuint
97gl_depth_func_to_sp(GLenum func)
98{
99   /* Same values, just biased */
100   assert(PIPE_FUNC_NEVER == GL_NEVER - GL_NEVER);
101   assert(PIPE_FUNC_LESS == GL_LESS - GL_NEVER);
102   assert(PIPE_FUNC_EQUAL == GL_EQUAL - GL_NEVER);
103   assert(PIPE_FUNC_LEQUAL == GL_LEQUAL - GL_NEVER);
104   assert(PIPE_FUNC_GREATER == GL_GREATER - GL_NEVER);
105   assert(PIPE_FUNC_NOTEQUAL == GL_NOTEQUAL - GL_NEVER);
106   assert(PIPE_FUNC_GEQUAL == GL_GEQUAL - GL_NEVER);
107   assert(PIPE_FUNC_ALWAYS == GL_ALWAYS - GL_NEVER);
108   assert(func >= GL_NEVER);
109   assert(func <= GL_ALWAYS);
110   return func - GL_NEVER;
111}
112
113
114static void
115update_depth_stencil(struct st_context *st)
116{
117   struct pipe_depth_stencil_state depth_stencil;
118   const struct cso_depth_stencil *cso;
119
120   memset(&depth_stencil, 0, sizeof(depth_stencil));
121
122   depth_stencil.depth.enabled = st->ctx->Depth.Test;
123   depth_stencil.depth.writemask = st->ctx->Depth.Mask;
124   depth_stencil.depth.func = gl_depth_func_to_sp(st->ctx->Depth.Func);
125   depth_stencil.depth.clear = st->ctx->Depth.Clear;
126
127   if (st->ctx->Query.CurrentOcclusionObject &&
128       st->ctx->Query.CurrentOcclusionObject->Active)
129      depth_stencil.depth.occlusion_count = 1;
130
131   if (st->ctx->Stencil.Enabled) {
132      depth_stencil.stencil.front_enabled = 1;
133      depth_stencil.stencil.front_func = gl_stencil_func_to_sp(st->ctx->Stencil.Function[0]);
134      depth_stencil.stencil.front_fail_op = gl_stencil_op_to_sp(st->ctx->Stencil.FailFunc[0]);
135      depth_stencil.stencil.front_zfail_op = gl_stencil_op_to_sp(st->ctx->Stencil.ZFailFunc[0]);
136      depth_stencil.stencil.front_zpass_op = gl_stencil_op_to_sp(st->ctx->Stencil.ZPassFunc[0]);
137      depth_stencil.stencil.ref_value[0] = st->ctx->Stencil.Ref[0] & 0xff;
138      depth_stencil.stencil.value_mask[0] = st->ctx->Stencil.ValueMask[0] & 0xff;
139      depth_stencil.stencil.write_mask[0] = st->ctx->Stencil.WriteMask[0] & 0xff;
140      if (st->ctx->Stencil.TestTwoSide) {
141         depth_stencil.stencil.back_enabled = 1;
142         depth_stencil.stencil.back_func = gl_stencil_func_to_sp(st->ctx->Stencil.Function[1]);
143         depth_stencil.stencil.back_fail_op = gl_stencil_op_to_sp(st->ctx->Stencil.FailFunc[1]);
144         depth_stencil.stencil.back_zfail_op = gl_stencil_op_to_sp(st->ctx->Stencil.ZFailFunc[1]);
145         depth_stencil.stencil.back_zpass_op = gl_stencil_op_to_sp(st->ctx->Stencil.ZPassFunc[1]);
146         depth_stencil.stencil.ref_value[1] = st->ctx->Stencil.Ref[1] & 0xff;
147         depth_stencil.stencil.value_mask[1] = st->ctx->Stencil.ValueMask[1] & 0xff;
148         depth_stencil.stencil.write_mask[1] = st->ctx->Stencil.WriteMask[1] & 0xff;
149      }
150      depth_stencil.stencil.clear_value = st->ctx->Stencil.Clear & 0xff;
151   }
152
153   cso = st_cached_depth_stencil_state(st, &depth_stencil);
154   if (st->state.depth_stencil != cso) {
155      /* state has changed */
156      st->state.depth_stencil = cso;
157      st->pipe->bind_depth_stencil_state(st->pipe, cso->data); /* bind new state */
158   }
159}
160
161
162const struct st_tracked_state st_update_depth_stencil = {
163   .name = "st_update_depth_stencil",
164   .dirty = {
165      .mesa = (_NEW_DEPTH|_NEW_STENCIL),
166      .st  = 0,
167   },
168   .update = update_depth_stencil
169};
170