src/mesa/x86/mmx.h

   1
   2 /*
   3  * Mesa 3-D graphics library
   4  * Version:  3.1
   5  *
   6  * Copyright (C) 1999  Brian Paul   All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions 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 MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  22  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26
  27
  28
  29
  30 #ifndef ASM_MMX_H
  31 #define ASM_MMX_H
  32
  33
  34 extern void _ASMAPI
  35 gl_mmx_blend_transparency( GLcontext *ctx, GLuint n, const GLubyte mask[],
  36                                                    GLubyte rgba[][4], const GLubyte dest[][4] );
  37
  38
  39 void gl_mmx_set_blend_function( GLcontext *ctx )
  40 {
  41    const GLenum eq = ctx->Color.BlendEquation;
  42    const GLenum srcRGB = ctx->Color.BlendSrcRGB;
  43    const GLenum dstRGB = ctx->Color.BlendDstRGB;
  44    const GLenum srcA = ctx->Color.BlendSrcA;
  45    const GLenum dstA = ctx->Color.BlendDstA;
  46
  47
  48    if (srcRGB != srcA || dstRGB != dstA) {
  49       ctx->Color.BlendFunc = blend_general;
  50    }
  51    else if (eq==GL_FUNC_ADD_EXT && srcRGB==GL_SRC_ALPHA
  52        && dstRGB==GL_ONE_MINUS_SRC_ALPHA) {
  53       ctx->Color.BlendFunc = gl_mmx_blend_transparency;
  54    }
  55    else if (eq==GL_FUNC_ADD_EXT && srcRGB==GL_ONE && dstRGB==GL_ONE) {
  56       ctx->Color.BlendFunc = blend_add;
  57    }
  58    else if (((eq==GL_FUNC_ADD_EXT || eq==GL_FUNC_REVERSE_SUBTRACT_EXT)
  59              && (srcRGB==GL_ZERO && dstRGB==GL_SRC_COLOR))
  60             ||
  61             ((eq==GL_FUNC_ADD_EXT || eq==GL_FUNC_SUBTRACT_EXT)
  62              && (srcRGB==GL_DST_COLOR && dstRGB==GL_ZERO))) {
  63       ctx->Color.BlendFunc = blend_modulate;
  64    }
  65    else if (eq==GL_MIN_EXT) {
  66       ctx->Color.BlendFunc = blend_min;
  67    }
  68    else if (eq==GL_MAX_EXT) {
  69       ctx->Color.BlendFunc = blend_max;
  70    }
  71    else {
  72       ctx->Color.BlendFunc = blend_general;
  73    }
  74 }
  75
  76
  77 #endif