src/gallium/drivers/svga/svga_pipe_depthstencil.c

   1 /**********************************************************
   2  * Copyright 2008-2009 VMware, Inc.  All rights reserved.
   3  *
   4  * Permission is hereby granted, free of charge, to any person
   5  * obtaining a copy of this software and associated documentation
   6  * files (the "Software"), to deal in the Software without
   7  * restriction, including without limitation the rights to use, copy,
   8  * modify, merge, publish, distribute, sublicense, and/or sell copies
   9  * of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  *
  24  **********************************************************/
  25
  26 #include "pipe/p_inlines.h"
  27 #include "pipe/p_defines.h"
  28 #include "util/u_math.h"
  29 #include "util/u_memory.h"
  30
  31 #include "svga_context.h"
  32 #include "svga_hw_reg.h"
  33
  34
  35 static INLINE unsigned
  36 svga_translate_compare_func(unsigned func)
  37 {
  38    switch (func) {
  39    case PIPE_FUNC_NEVER:     return SVGA3D_CMP_NEVER;
  40    case PIPE_FUNC_LESS:      return SVGA3D_CMP_LESS;
  41    case PIPE_FUNC_LEQUAL:    return SVGA3D_CMP_LESSEQUAL;
  42    case PIPE_FUNC_GREATER:   return SVGA3D_CMP_GREATER;
  43    case PIPE_FUNC_GEQUAL:    return SVGA3D_CMP_GREATEREQUAL;
  44    case PIPE_FUNC_NOTEQUAL:  return SVGA3D_CMP_NOTEQUAL;
  45    case PIPE_FUNC_EQUAL:     return SVGA3D_CMP_EQUAL;
  46    case PIPE_FUNC_ALWAYS:    return SVGA3D_CMP_ALWAYS;
  47    default:
  48       assert(0);
  49       return SVGA3D_CMP_ALWAYS;
  50    }
  51 }
  52
  53 static INLINE unsigned
  54 svga_translate_stencil_op(unsigned op)
  55 {
  56    switch (op) {
  57    case PIPE_STENCIL_OP_KEEP:      return SVGA3D_STENCILOP_KEEP;
  58    case PIPE_STENCIL_OP_ZERO:      return SVGA3D_STENCILOP_ZERO;
  59    case PIPE_STENCIL_OP_REPLACE:   return SVGA3D_STENCILOP_REPLACE;
  60    case PIPE_STENCIL_OP_INCR:      return SVGA3D_STENCILOP_INCR;
  61    case PIPE_STENCIL_OP_DECR:      return SVGA3D_STENCILOP_DECR;
  62    case PIPE_STENCIL_OP_INCR_WRAP: return SVGA3D_STENCILOP_INCRSAT; /* incorrect? */
  63    case PIPE_STENCIL_OP_DECR_WRAP: return SVGA3D_STENCILOP_DECRSAT; /* incorrect? */
  64    case PIPE_STENCIL_OP_INVERT:    return SVGA3D_STENCILOP_INVERT;
  65    default:
  66       assert(0);
  67       return SVGA3D_STENCILOP_KEEP;
  68    }
  69 }
  70
  71
  72 static void *
  73 svga_create_depth_stencil_state(struct pipe_context *pipe,
  74                                 const struct pipe_depth_stencil_alpha_state *templ)
  75 {
  76    struct svga_depth_stencil_state *ds = CALLOC_STRUCT( svga_depth_stencil_state );
  77
  78    /* Don't try to figure out CW/CCW correspondence with
  79     * stencil[0]/[1] at this point.  Presumably this can change as
  80     * back/front face are modified.
  81     */
  82    ds->stencil[0].enabled = templ->stencil[0].enabled;
  83    if (ds->stencil[0].enabled) {
  84       ds->stencil[0].func  = svga_translate_compare_func(templ->stencil[0].func);
  85       ds->stencil[0].fail  = svga_translate_stencil_op(templ->stencil[0].fail_op);
  86       ds->stencil[0].zfail = svga_translate_stencil_op(templ->stencil[0].zfail_op);
  87       ds->stencil[0].pass  = svga_translate_stencil_op(templ->stencil[0].zpass_op);
  88
  89       /* SVGA3D has one ref/mask/writemask triple shared between front &
  90        * back face stencil.  We really need two:
  91        */
  92       ds->stencil_ref       = templ->stencil[0].ref_value & 0xff;
  93       ds->stencil_mask      = templ->stencil[0].valuemask & 0xff;
  94       ds->stencil_writemask = templ->stencil[0].writemask & 0xff;
  95    }
  96
  97
  98    ds->stencil[1].enabled = templ->stencil[1].enabled;
  99    if (templ->stencil[1].enabled) {
 100       ds->stencil[1].func   = svga_translate_compare_func(templ->stencil[1].func);
 101       ds->stencil[1].fail   = svga_translate_stencil_op(templ->stencil[1].fail_op);
 102       ds->stencil[1].zfail  = svga_translate_stencil_op(templ->stencil[1].zfail_op);
 103       ds->stencil[1].pass   = svga_translate_stencil_op(templ->stencil[1].zpass_op);
 104
 105       ds->stencil_ref       = templ->stencil[1].ref_value & 0xff;
 106       ds->stencil_mask      = templ->stencil[1].valuemask & 0xff;
 107       ds->stencil_writemask = templ->stencil[1].writemask & 0xff;
 108    }
 109
 110
 111    ds->zenable = templ->depth.enabled;
 112    if (ds->zenable) {
 113       ds->zfunc = svga_translate_compare_func(templ->depth.func);
 114       ds->zwriteenable = templ->depth.writemask;
 115    }
 116
 117    ds->alphatestenable = templ->alpha.enabled;
 118    if (ds->alphatestenable) {
 119       ds->alphafunc = svga_translate_compare_func(templ->alpha.func);
 120       ds->alpharef = templ->alpha.ref_value;
 121    }
 122
 123    return ds;
 124 }
 125
 126 static void svga_bind_depth_stencil_state(struct pipe_context *pipe,
 127                                           void *depth_stencil)
 128 {
 129    struct svga_context *svga = svga_context(pipe);
 130
 131    svga->curr.depth = (const struct svga_depth_stencil_state *)depth_stencil;
 132    svga->dirty |= SVGA_NEW_DEPTH_STENCIL;
 133 }
 134
 135 static void svga_delete_depth_stencil_state(struct pipe_context *pipe,
 136                                             void *depth_stencil)
 137 {
 138    FREE(depth_stencil);
 139 }
 140
 141
 142
 143 void svga_init_depth_stencil_functions( struct svga_context *svga )
 144 {
 145    svga->pipe.create_depth_stencil_alpha_state = svga_create_depth_stencil_state;
 146    svga->pipe.bind_depth_stencil_alpha_state = svga_bind_depth_stencil_state;
 147    svga->pipe.delete_depth_stencil_alpha_state = svga_delete_depth_stencil_state;
 148 }
 149
 150
 151
 152