st_atom_depth.c revision 339e7ec6805e6de8794514c0a935081b5d36d38f 
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_atom.h"
38#include "pipe/p_context.h"
39#include "pipe/p_defines.h"
40#include "cso_cache/cso_context.h"
41
42
43/**
44 * Convert an OpenGL compare mode to a pipe tokens.
45 */
46GLuint
47st_compare_func_to_pipe(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_pipe(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_pipe()" == NULL);
89      return 0;
90   }
91}
92
93static void
94update_depth_stencil_alpha(struct st_context *st)
95{
96   struct pipe_depth_stencil_alpha_state *dsa = &st->state.depth_stencil;
97
98   memset(dsa, 0, sizeof(*dsa));
99
100   dsa->depth.enabled = st->ctx->Depth.Test;
101   dsa->depth.writemask = st->ctx->Depth.Mask;
102   dsa->depth.func = st_compare_func_to_pipe(st->ctx->Depth.Func);
103
104   if (st->ctx->Query.CurrentOcclusionObject &&
105       st->ctx->Query.CurrentOcclusionObject->Active)
106      dsa->depth.occlusion_count = 1;
107
108   if (st->ctx->Stencil.Enabled) {
109      dsa->stencil[0].enabled = 1;
110      dsa->stencil[0].func = st_compare_func_to_pipe(st->ctx->Stencil.Function[0]);
111      dsa->stencil[0].fail_op = gl_stencil_op_to_pipe(st->ctx->Stencil.FailFunc[0]);
112      dsa->stencil[0].zfail_op = gl_stencil_op_to_pipe(st->ctx->Stencil.ZFailFunc[0]);
113      dsa->stencil[0].zpass_op = gl_stencil_op_to_pipe(st->ctx->Stencil.ZPassFunc[0]);
114      dsa->stencil[0].ref_value = st->ctx->Stencil.Ref[0] & 0xff;
115      dsa->stencil[0].value_mask = st->ctx->Stencil.ValueMask[0] & 0xff;
116      dsa->stencil[0].write_mask = st->ctx->Stencil.WriteMask[0] & 0xff;
117
118      if (st->ctx->Stencil.TestTwoSide) {
119         dsa->stencil[1].enabled = 1;
120         dsa->stencil[1].func = st_compare_func_to_pipe(st->ctx->Stencil.Function[1]);
121         dsa->stencil[1].fail_op = gl_stencil_op_to_pipe(st->ctx->Stencil.FailFunc[1]);
122         dsa->stencil[1].zfail_op = gl_stencil_op_to_pipe(st->ctx->Stencil.ZFailFunc[1]);
123         dsa->stencil[1].zpass_op = gl_stencil_op_to_pipe(st->ctx->Stencil.ZPassFunc[1]);
124         dsa->stencil[1].ref_value = st->ctx->Stencil.Ref[1] & 0xff;
125         dsa->stencil[1].value_mask = st->ctx->Stencil.ValueMask[1] & 0xff;
126         dsa->stencil[1].write_mask = st->ctx->Stencil.WriteMask[1] & 0xff;
127      }
128   }
129
130   if (st->ctx->Color.AlphaEnabled) {
131      dsa->alpha.enabled = 1;
132      dsa->alpha.func = st_compare_func_to_pipe(st->ctx->Color.AlphaFunc);
133      dsa->alpha.ref = st->ctx->Color.AlphaRef;
134   }
135
136   cso_set_depth_stencil_alpha(st->cso_context, dsa);
137}
138
139
140const struct st_tracked_state st_update_depth_stencil_alpha = {
141   .name = "st_update_depth_stencil",
142   .dirty = {
143      .mesa = (_NEW_DEPTH|_NEW_STENCIL|_NEW_COLOR),
144      .st  = 0,
145   },
146   .update = update_depth_stencil_alpha
147};
148