src/mesa/x86/mmx.h

   1 /* $Id: mmx.h,v 1.3 2000/10/23 00:16:28 gareth Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   6  *
   7  * Copyright (C) 1999  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27
  28
  29
  30
  31 #ifndef ASM_MMX_H
  32 #define ASM_MMX_H
  33
  34
  35 extern void _ASMAPI
  36 gl_mmx_blend_transparency( GLcontext *ctx, GLuint n, const GLubyte mask[],
  37                                                    GLubyte rgba[][4], const GLubyte dest[][4] );
  38
  39
  40 void gl_mmx_set_blend_function( GLcontext *ctx )
  41 {
  42    const GLenum eq = ctx->Color.BlendEquation;
  43    const GLenum srcRGB = ctx->Color.BlendSrcRGB;
  44    const GLenum dstRGB = ctx->Color.BlendDstRGB;
  45    const GLenum srcA = ctx->Color.BlendSrcA;
  46    const GLenum dstA = ctx->Color.BlendDstA;
  47
  48
  49    if (srcRGB != srcA || dstRGB != dstA) {
  50       ctx->Color.BlendFunc = blend_general;
  51    }
  52    else if (eq==GL_FUNC_ADD_EXT && srcRGB==GL_SRC_ALPHA
  53        && dstRGB==GL_ONE_MINUS_SRC_ALPHA) {
  54       ctx->Color.BlendFunc = gl_mmx_blend_transparency;
  55    }
  56    else if (eq==GL_FUNC_ADD_EXT && srcRGB==GL_ONE && dstRGB==GL_ONE) {
  57       ctx->Color.BlendFunc = blend_add;
  58    }
  59    else if (((eq==GL_FUNC_ADD_EXT || eq==GL_FUNC_REVERSE_SUBTRACT_EXT)
  60              && (srcRGB==GL_ZERO && dstRGB==GL_SRC_COLOR))
  61             ||
  62             ((eq==GL_FUNC_ADD_EXT || eq==GL_FUNC_SUBTRACT_EXT)
  63              && (srcRGB==GL_DST_COLOR && dstRGB==GL_ZERO))) {
  64       ctx->Color.BlendFunc = blend_modulate;
  65    }
  66    else if (eq==GL_MIN_EXT) {
  67       ctx->Color.BlendFunc = blend_min;
  68    }
  69    else if (eq==GL_MAX_EXT) {
  70       ctx->Color.BlendFunc = blend_max;
  71    }
  72    else {
  73       ctx->Color.BlendFunc = blend_general;
  74    }
  75 }
  76
  77
  78 #endif