src/mesa/drivers/dri/i965/intel_state.c

   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 }