src/mesa/drivers/dri/sis/sis_stencil.c

   1 /**************************************************************************
   2
   3 Copyright 2000 Silicon Integrated Systems Corp, Inc., HsinChu, Taiwan.
   4 Copyright 2003 Eric Anholt
   5 All Rights Reserved.
   6
   7 Permission is hereby granted, free of charge, to any person obtaining a
   8 copy of this software and associated documentation files (the "Software"),
   9 to deal in the Software without restriction, including without limitation
  10 on the rights to use, copy, modify, merge, publish, distribute, sub
  11 license, and/or sell copies of the Software, and to permit persons to whom
  12 the Software is furnished to do so, subject to the following conditions:
  13
  14 The above copyright notice and this permission notice (including the next
  15 paragraph) shall be included in all copies or substantial portions of the
  16 Software.
  17
  18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20 FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21 ERIC ANHOLT OR SILICON INTEGRATED SYSTEMS CORP BE LIABLE FOR ANY CLAIM,
  22 DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23 OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24 USE OR OTHER DEALINGS IN THE SOFTWARE.
  25
  26 **************************************************************************/
  27 /* $XFree86: xc/lib/GL/mesa/src/drv/sis/sis_stencil.c,v 1.3 2000/09/26 15:56:49 tsi Exp $ */
  28
  29 /*
  30  * Authors:
  31  *   Sung-Ching Lin <sclin@sis.com.tw>
  32  *   Eric Anholt <anholt@FreeBSD.org>
  33  */
  34
  35 #include "sis_context.h"
  36 #include "sis_state.h"
  37 #include "sis_stencil.h"
  38
  39 static void
  40 sisDDStencilFunc( GLcontext * ctx, GLenum func, GLint ref, GLuint mask )
  41 {
  42   sisContextPtr smesa = SIS_CONTEXT(ctx);
  43   __GLSiSHardware *prev = &smesa->prev;
  44   __GLSiSHardware *current = &smesa->current;
  45
  46    /* set reference */
  47    current->hwStSetting = STENCIL_FORMAT_8 | (ctx->Stencil.Ref[0] << 8) |
  48       ctx->Stencil.ValueMask[0];
  49
  50   switch (func)
  51     {
  52     case GL_NEVER:
  53       current->hwStSetting |= SiS_STENCIL_NEVER;
  54       break;
  55     case GL_LESS:
  56       current->hwStSetting |= SiS_STENCIL_LESS;
  57       break;
  58     case GL_EQUAL:
  59       current->hwStSetting |= SiS_STENCIL_EQUAL;
  60       break;
  61     case GL_LEQUAL:
  62       current->hwStSetting |= SiS_STENCIL_LEQUAL;
  63       break;
  64     case GL_GREATER:
  65       current->hwStSetting |= SiS_STENCIL_GREATER;
  66       break;
  67     case GL_NOTEQUAL:
  68       current->hwStSetting |= SiS_STENCIL_NOTEQUAL;
  69       break;
  70     case GL_GEQUAL:
  71       current->hwStSetting |= SiS_STENCIL_GEQUAL;
  72       break;
  73     case GL_ALWAYS:
  74       current->hwStSetting |= SiS_STENCIL_ALWAYS;
  75       break;
  76     }
  77
  78    if (current->hwStSetting != prev->hwStSetting)
  79    {
  80       prev->hwStSetting = current->hwStSetting;
  81
  82       smesa->GlobalFlag |= GFLAG_STENCILSETTING;
  83    }
  84 }
  85
  86 static void
  87 sisDDStencilMask( GLcontext * ctx, GLuint mask )
  88 {
  89   if (!ctx->Visual.stencilBits)
  90     return;
  91
  92   /* set Z buffer Write Enable */
  93   sisDDDepthMask (ctx, ctx->Depth.Mask);
  94 }
  95
  96 static void
  97 sisDDStencilOp( GLcontext * ctx, GLenum fail, GLenum zfail, GLenum zpass )
  98 {
  99   sisContextPtr smesa = SIS_CONTEXT(ctx);
 100   __GLSiSHardware *prev = &smesa->prev;
 101   __GLSiSHardware *current = &smesa->current;
 102
 103    current->hwStSetting2 &= ~(MASK_StencilZPassOp | MASK_StencilZFailOp |
 104       MASK_StencilFailOp);
 105
 106   switch (fail)
 107     {
 108     case GL_KEEP:
 109       current->hwStSetting2 |= SiS_SFAIL_KEEP;
 110       break;
 111     case GL_ZERO:
 112       current->hwStSetting2 |= SiS_SFAIL_ZERO;
 113       break;
 114     case GL_REPLACE:
 115       current->hwStSetting2 |= SiS_SFAIL_REPLACE;
 116       break;
 117     case GL_INVERT:
 118       current->hwStSetting2 |= SiS_SFAIL_INVERT;
 119       break;
 120     case GL_INCR:
 121       current->hwStSetting2 |= SiS_SFAIL_INCR;
 122       break;
 123     case GL_DECR:
 124       current->hwStSetting2 |= SiS_SFAIL_DECR;
 125       break;
 126     }
 127
 128   switch (zfail)
 129     {
 130     case GL_KEEP:
 131       current->hwStSetting2 |= SiS_SPASS_ZFAIL_KEEP;
 132       break;
 133     case GL_ZERO:
 134       current->hwStSetting2 |= SiS_SPASS_ZFAIL_ZERO;
 135       break;
 136     case GL_REPLACE:
 137       current->hwStSetting2 |= SiS_SPASS_ZFAIL_REPLACE;
 138       break;
 139     case GL_INVERT:
 140       current->hwStSetting2 |= SiS_SPASS_ZFAIL_INVERT;
 141       break;
 142     case GL_INCR:
 143       current->hwStSetting2 |= SiS_SPASS_ZFAIL_INCR;
 144       break;
 145     case GL_DECR:
 146       current->hwStSetting2 |= SiS_SPASS_ZFAIL_DECR;
 147       break;
 148     }
 149
 150   switch (zpass)
 151     {
 152     case GL_KEEP:
 153       current->hwStSetting2 |= SiS_SPASS_ZPASS_KEEP;
 154       break;
 155     case GL_ZERO:
 156       current->hwStSetting2 |= SiS_SPASS_ZPASS_ZERO;
 157       break;
 158     case GL_REPLACE:
 159       current->hwStSetting2 |= SiS_SPASS_ZPASS_REPLACE;
 160       break;
 161     case GL_INVERT:
 162       current->hwStSetting2 |= SiS_SPASS_ZPASS_INVERT;
 163       break;
 164     case GL_INCR:
 165       current->hwStSetting2 |= SiS_SPASS_ZPASS_INCR;
 166       break;
 167     case GL_DECR:
 168       current->hwStSetting2 |= SiS_SPASS_ZPASS_DECR;
 169       break;
 170     }
 171
 172    if (current->hwStSetting2 != prev->hwStSetting2)
 173    {
 174       prev->hwStSetting2 = current->hwStSetting2;
 175       smesa->GlobalFlag |= GFLAG_STENCILSETTING;
 176    }
 177 }
 178
 179 void
 180 sisDDInitStencilFuncs( GLcontext *ctx )
 181 {
 182   ctx->Driver.StencilFunc = sisDDStencilFunc;
 183   ctx->Driver.StencilMask = sisDDStencilMask;
 184   ctx->Driver.StencilOp   = sisDDStencilOp;
 185 }