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

   1 /*
   2  * Copyright 2003 VMware, Inc.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sublicense, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the
  14  * next paragraph) shall be included in all copies or substantial portions
  15  * of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  20  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  21  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  22  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  23  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 #include "main/glheader.h"
  27 #include "main/context.h"
  28 #include "main/macros.h"
  29 #include "main/enums.h"
  30 #include "main/dd.h"
  31
  32 #include "intel_screen.h"
  33 #include "brw_context.h"
  34 #include "brw_defines.h"
  35
  36 int
  37 intel_translate_shadow_compare_func(GLenum func)
  38 {
  39    /* GL specifies the result of shadow comparisons as:
  40     *     1     if   ref <op> texel,
  41     *     0     otherwise.
  42     *
  43     * The hardware does:
  44     *     0     if texel <op> ref,
  45     *     1     otherwise.
  46     *
  47     * So, these look a bit strange because there's both a negation
  48     * and swapping of the arguments involved.
  49     */
  50    switch (func) {
  51    case GL_NEVER:
  52       return BRW_COMPAREFUNCTION_ALWAYS;
  53    case GL_LESS:
  54       return BRW_COMPAREFUNCTION_LEQUAL;
  55    case GL_LEQUAL:
  56       return BRW_COMPAREFUNCTION_LESS;
  57    case GL_GREATER:
  58       return BRW_COMPAREFUNCTION_GEQUAL;
  59    case GL_GEQUAL:
  60       return BRW_COMPAREFUNCTION_GREATER;
  61    case GL_NOTEQUAL:
  62       return BRW_COMPAREFUNCTION_EQUAL;
  63    case GL_EQUAL:
  64       return BRW_COMPAREFUNCTION_NOTEQUAL;
  65    case GL_ALWAYS:
  66       return BRW_COMPAREFUNCTION_NEVER;
  67    }
  68
  69    unreachable("Invalid shadow comparison function.");
  70 }
  71
  72 int
  73 intel_translate_compare_func(GLenum func)
  74 {
  75    switch (func) {
  76    case GL_NEVER:
  77       return BRW_COMPAREFUNCTION_NEVER;
  78    case GL_LESS:
  79       return BRW_COMPAREFUNCTION_LESS;
  80    case GL_LEQUAL:
  81       return BRW_COMPAREFUNCTION_LEQUAL;
  82    case GL_GREATER:
  83       return BRW_COMPAREFUNCTION_GREATER;
  84    case GL_GEQUAL:
  85       return BRW_COMPAREFUNCTION_GEQUAL;
  86    case GL_NOTEQUAL:
  87       return BRW_COMPAREFUNCTION_NOTEQUAL;
  88    case GL_EQUAL:
  89       return BRW_COMPAREFUNCTION_EQUAL;
  90    case GL_ALWAYS:
  91       return BRW_COMPAREFUNCTION_ALWAYS;
  92    }
  93
  94    unreachable("Invalid comparison function.");
  95 }
  96
  97 int
  98 intel_translate_stencil_op(GLenum op)
  99 {
 100    switch (op) {
 101    case GL_KEEP:
 102       return BRW_STENCILOP_KEEP;
 103    case GL_ZERO:
 104       return BRW_STENCILOP_ZERO;
 105    case GL_REPLACE:
 106       return BRW_STENCILOP_REPLACE;
 107    case GL_INCR:
 108       return BRW_STENCILOP_INCRSAT;
 109    case GL_DECR:
 110       return BRW_STENCILOP_DECRSAT;
 111    case GL_INCR_WRAP:
 112       return BRW_STENCILOP_INCR;
 113    case GL_DECR_WRAP:
 114       return BRW_STENCILOP_DECR;
 115    case GL_INVERT:
 116       return BRW_STENCILOP_INVERT;
 117    default:
 118       return BRW_STENCILOP_ZERO;
 119    }
 120 }
 121
 122 int
 123 intel_translate_logic_op(GLenum opcode)
 124 {
 125    switch (opcode) {
 126    case GL_CLEAR:
 127       return BRW_LOGICOPFUNCTION_CLEAR;
 128    case GL_AND:
 129       return BRW_LOGICOPFUNCTION_AND;
 130    case GL_AND_REVERSE:
 131       return BRW_LOGICOPFUNCTION_AND_REVERSE;
 132    case GL_COPY:
 133       return BRW_LOGICOPFUNCTION_COPY;
 134    case GL_COPY_INVERTED:
 135       return BRW_LOGICOPFUNCTION_COPY_INVERTED;
 136    case GL_AND_INVERTED:
 137       return BRW_LOGICOPFUNCTION_AND_INVERTED;
 138    case GL_NOOP:
 139       return BRW_LOGICOPFUNCTION_NOOP;
 140    case GL_XOR:
 141       return BRW_LOGICOPFUNCTION_XOR;
 142    case GL_OR:
 143       return BRW_LOGICOPFUNCTION_OR;
 144    case GL_OR_INVERTED:
 145       return BRW_LOGICOPFUNCTION_OR_INVERTED;
 146    case GL_NOR:
 147       return BRW_LOGICOPFUNCTION_NOR;
 148    case GL_EQUIV:
 149       return BRW_LOGICOPFUNCTION_EQUIV;
 150    case GL_INVERT:
 151       return BRW_LOGICOPFUNCTION_INVERT;
 152    case GL_OR_REVERSE:
 153       return BRW_LOGICOPFUNCTION_OR_REVERSE;
 154    case GL_NAND:
 155       return BRW_LOGICOPFUNCTION_NAND;
 156    case GL_SET:
 157       return BRW_LOGICOPFUNCTION_SET;
 158    default:
 159       return BRW_LOGICOPFUNCTION_SET;
 160    }
 161 }