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