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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2003 VMware, Inc.
  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 VMWARE 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. #include "main/glheader.h"
  30. #include "main/context.h"
  31. #include "main/macros.h"
  32. #include "main/enums.h"
  33. #include "main/colormac.h"
  34. #include "main/dd.h"
  35.  
  36. #include "intel_screen.h"
  37. #include "brw_context.h"
  38. #include "brw_defines.h"
  39.  
  40. int
  41. intel_translate_shadow_compare_func(GLenum func)
  42. {
  43.    /* GL specifies the result of shadow comparisons as:
  44.     *     1     if   ref <op> texel,
  45.     *     0     otherwise.
  46.     *
  47.     * The hardware does:
  48.     *     0     if texel <op> ref,
  49.     *     1     otherwise.
  50.     *
  51.     * So, these look a bit strange because there's both a negation
  52.     * and swapping of the arguments involved.
  53.     */
  54.    switch (func) {
  55.    case GL_NEVER:
  56.       return BRW_COMPAREFUNCTION_ALWAYS;
  57.    case GL_LESS:
  58.       return BRW_COMPAREFUNCTION_LEQUAL;
  59.    case GL_LEQUAL:
  60.       return BRW_COMPAREFUNCTION_LESS;
  61.    case GL_GREATER:
  62.       return BRW_COMPAREFUNCTION_GEQUAL;
  63.    case GL_GEQUAL:
  64.       return BRW_COMPAREFUNCTION_GREATER;
  65.    case GL_NOTEQUAL:
  66.       return BRW_COMPAREFUNCTION_EQUAL;
  67.    case GL_EQUAL:
  68.       return BRW_COMPAREFUNCTION_NOTEQUAL;
  69.    case GL_ALWAYS:
  70.       return BRW_COMPAREFUNCTION_NEVER;
  71.    }
  72.  
  73.    unreachable("Invalid shadow comparison function.");
  74. }
  75.  
  76. int
  77. intel_translate_compare_func(GLenum func)
  78. {
  79.    switch (func) {
  80.    case GL_NEVER:
  81.       return BRW_COMPAREFUNCTION_NEVER;
  82.    case GL_LESS:
  83.       return BRW_COMPAREFUNCTION_LESS;
  84.    case GL_LEQUAL:
  85.       return BRW_COMPAREFUNCTION_LEQUAL;
  86.    case GL_GREATER:
  87.       return BRW_COMPAREFUNCTION_GREATER;
  88.    case GL_GEQUAL:
  89.       return BRW_COMPAREFUNCTION_GEQUAL;
  90.    case GL_NOTEQUAL:
  91.       return BRW_COMPAREFUNCTION_NOTEQUAL;
  92.    case GL_EQUAL:
  93.       return BRW_COMPAREFUNCTION_EQUAL;
  94.    case GL_ALWAYS:
  95.       return BRW_COMPAREFUNCTION_ALWAYS;
  96.    }
  97.  
  98.    unreachable("Invalid comparison function.");
  99. }
  100.  
  101. int
  102. intel_translate_stencil_op(GLenum op)
  103. {
  104.    switch (op) {
  105.    case GL_KEEP:
  106.       return BRW_STENCILOP_KEEP;
  107.    case GL_ZERO:
  108.       return BRW_STENCILOP_ZERO;
  109.    case GL_REPLACE:
  110.       return BRW_STENCILOP_REPLACE;
  111.    case GL_INCR:
  112.       return BRW_STENCILOP_INCRSAT;
  113.    case GL_DECR:
  114.       return BRW_STENCILOP_DECRSAT;
  115.    case GL_INCR_WRAP:
  116.       return BRW_STENCILOP_INCR;
  117.    case GL_DECR_WRAP:
  118.       return BRW_STENCILOP_DECR;
  119.    case GL_INVERT:
  120.       return BRW_STENCILOP_INVERT;
  121.    default:
  122.       return BRW_STENCILOP_ZERO;
  123.    }
  124. }
  125.  
  126. int
  127. intel_translate_logic_op(GLenum opcode)
  128. {
  129.    switch (opcode) {
  130.    case GL_CLEAR:
  131.       return BRW_LOGICOPFUNCTION_CLEAR;
  132.    case GL_AND:
  133.       return BRW_LOGICOPFUNCTION_AND;
  134.    case GL_AND_REVERSE:
  135.       return BRW_LOGICOPFUNCTION_AND_REVERSE;
  136.    case GL_COPY:
  137.       return BRW_LOGICOPFUNCTION_COPY;
  138.    case GL_COPY_INVERTED:
  139.       return BRW_LOGICOPFUNCTION_COPY_INVERTED;
  140.    case GL_AND_INVERTED:
  141.       return BRW_LOGICOPFUNCTION_AND_INVERTED;
  142.    case GL_NOOP:
  143.       return BRW_LOGICOPFUNCTION_NOOP;
  144.    case GL_XOR:
  145.       return BRW_LOGICOPFUNCTION_XOR;
  146.    case GL_OR:
  147.       return BRW_LOGICOPFUNCTION_OR;
  148.    case GL_OR_INVERTED:
  149.       return BRW_LOGICOPFUNCTION_OR_INVERTED;
  150.    case GL_NOR:
  151.       return BRW_LOGICOPFUNCTION_NOR;
  152.    case GL_EQUIV:
  153.       return BRW_LOGICOPFUNCTION_EQUIV;
  154.    case GL_INVERT:
  155.       return BRW_LOGICOPFUNCTION_INVERT;
  156.    case GL_OR_REVERSE:
  157.       return BRW_LOGICOPFUNCTION_OR_REVERSE;
  158.    case GL_NAND:
  159.       return BRW_LOGICOPFUNCTION_NAND;
  160.    case GL_SET:
  161.       return BRW_LOGICOPFUNCTION_SET;
  162.    default:
  163.       return BRW_LOGICOPFUNCTION_SET;
  164.    }
  165. }
  166.