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