st_atom_depth.c revision db8a84de8765fc969a3fff3f1275852916eda042 
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 <assert.h>
37
38#include "st_context.h"
39#include "st_atom.h"
40#include "pipe/p_context.h"
41#include "pipe/p_defines.h"
42#include "cso_cache/cso_context.h"
43
44#include "main/core.h"
45#include "main/stencil.h"
46
47
48/**
49 * Convert an OpenGL compare mode to a pipe tokens.
50 */
51GLuint
52st_compare_func_to_pipe(GLenum func)
53{
54   /* Same values, just biased */
55   STATIC_ASSERT(PIPE_FUNC_NEVER == GL_NEVER - GL_NEVER);
56   STATIC_ASSERT(PIPE_FUNC_LESS == GL_LESS - GL_NEVER);
57   STATIC_ASSERT(PIPE_FUNC_EQUAL == GL_EQUAL - GL_NEVER);
58   STATIC_ASSERT(PIPE_FUNC_LEQUAL == GL_LEQUAL - GL_NEVER);
59   STATIC_ASSERT(PIPE_FUNC_GREATER == GL_GREATER - GL_NEVER);
60   STATIC_ASSERT(PIPE_FUNC_NOTEQUAL == GL_NOTEQUAL - GL_NEVER);
61   STATIC_ASSERT(PIPE_FUNC_GEQUAL == GL_GEQUAL - GL_NEVER);
62   STATIC_ASSERT(PIPE_FUNC_ALWAYS == GL_ALWAYS - GL_NEVER);
63   assert(func >= GL_NEVER);
64   assert(func <= GL_ALWAYS);
65   return func - GL_NEVER;
66}
67
68
69/**
70 * Convert GLenum stencil op tokens to pipe tokens.
71 */
72static GLuint
73gl_stencil_op_to_pipe(GLenum func)
74{
75   switch (func) {
76   case GL_KEEP:
77      return PIPE_STENCIL_OP_KEEP;
78   case GL_ZERO:
79      return PIPE_STENCIL_OP_ZERO;
80   case GL_REPLACE:
81      return PIPE_STENCIL_OP_REPLACE;
82   case GL_INCR:
83      return PIPE_STENCIL_OP_INCR;
84   case GL_DECR:
85      return PIPE_STENCIL_OP_DECR;
86   case GL_INCR_WRAP:
87      return PIPE_STENCIL_OP_INCR_WRAP;
88   case GL_DECR_WRAP:
89      return PIPE_STENCIL_OP_DECR_WRAP;
90   case GL_INVERT:
91      return PIPE_STENCIL_OP_INVERT;
92   default:
93      assert("invalid GL token in gl_stencil_op_to_pipe()" == NULL);
94      return 0;
95   }
96}
97
98static void
99update_depth_stencil_alpha(struct st_context *st)
100{
101   struct pipe_depth_stencil_alpha_state *dsa = &st->state.depth_stencil;
102   struct pipe_stencil_ref sr;
103   struct gl_context *ctx = st->ctx;
104
105   memset(dsa, 0, sizeof(*dsa));
106   memset(&sr, 0, sizeof(sr));
107
108   if (ctx->Depth.Test && ctx->DrawBuffer->Visual.depthBits > 0) {
109      dsa->depth.enabled = 1;
110      dsa->depth.writemask = ctx->Depth.Mask;
111      dsa->depth.func = st_compare_func_to_pipe(ctx->Depth.Func);
112   }
113
114   if (ctx->Stencil.Enabled && ctx->DrawBuffer->Visual.stencilBits > 0) {
115      dsa->stencil[0].enabled = 1;
116      dsa->stencil[0].func = st_compare_func_to_pipe(ctx->Stencil.Function[0]);
117      dsa->stencil[0].fail_op = gl_stencil_op_to_pipe(ctx->Stencil.FailFunc[0]);
118      dsa->stencil[0].zfail_op = gl_stencil_op_to_pipe(ctx->Stencil.ZFailFunc[0]);
119      dsa->stencil[0].zpass_op = gl_stencil_op_to_pipe(ctx->Stencil.ZPassFunc[0]);
120      dsa->stencil[0].valuemask = ctx->Stencil.ValueMask[0] & 0xff;
121      dsa->stencil[0].writemask = ctx->Stencil.WriteMask[0] & 0xff;
122      sr.ref_value[0] = _mesa_get_stencil_ref(ctx, 0);
123
124      if (ctx->Stencil._TestTwoSide) {
125         const GLuint back = ctx->Stencil._BackFace;
126         dsa->stencil[1].enabled = 1;
127         dsa->stencil[1].func = st_compare_func_to_pipe(ctx->Stencil.Function[back]);
128         dsa->stencil[1].fail_op = gl_stencil_op_to_pipe(ctx->Stencil.FailFunc[back]);
129         dsa->stencil[1].zfail_op = gl_stencil_op_to_pipe(ctx->Stencil.ZFailFunc[back]);
130         dsa->stencil[1].zpass_op = gl_stencil_op_to_pipe(ctx->Stencil.ZPassFunc[back]);
131         dsa->stencil[1].valuemask = ctx->Stencil.ValueMask[back] & 0xff;
132         dsa->stencil[1].writemask = ctx->Stencil.WriteMask[back] & 0xff;
133         sr.ref_value[1] = _mesa_get_stencil_ref(ctx, back);
134      }
135      else {
136         /* This should be unnecessary. Drivers must not expect this to
137          * contain valid data, except the enabled bit
138          */
139         dsa->stencil[1] = dsa->stencil[0];
140         dsa->stencil[1].enabled = 0;
141         sr.ref_value[1] = sr.ref_value[0];
142      }
143   }
144
145   if (ctx->Color.AlphaEnabled) {
146      dsa->alpha.enabled = 1;
147      dsa->alpha.func = st_compare_func_to_pipe(ctx->Color.AlphaFunc);
148      dsa->alpha.ref_value = ctx->Color.AlphaRefUnclamped;
149   }
150
151   cso_set_depth_stencil_alpha(st->cso_context, dsa);
152   cso_set_stencil_ref(st->cso_context, &sr);
153}
154
155
156const struct st_tracked_state st_update_depth_stencil_alpha = {
157   "st_update_depth_stencil",				/* name */
158   {							/* dirty */
159      (_NEW_DEPTH|_NEW_STENCIL|_NEW_COLOR|_NEW_BUFFERS),/* mesa */
160      0,						/* st */
161   },
162   update_depth_stencil_alpha				/* update */
163};
164