src/mesa/swrast/s_spantemp.h

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5.1
   4  *
   5  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions 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 MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 /*
  27  * Templates for the span/pixel-array write/read functions called via
  28  * the gl_renderbuffer's GetRow, GetValues, PutRow, and PutValues.
  29  *
  30  * Define the following macros before including this file:
  31  *   NAME(BASE)  to generate the function name (i.e. add prefix or suffix)
  32  *   RB_TYPE  the renderbuffer DataType
  33  *   SPAN_VARS  to declare any local variables
  34  *   INIT_PIXEL_PTR(P, X, Y)  to initialize a pointer to a pixel
  35  *   INC_PIXEL_PTR(P)  to increment a pixel pointer by one pixel
  36  *   STORE_PIXEL(DST, X, Y, VALUE)  to store pixel values in buffer
  37  *   FETCH_PIXEL(DST, SRC)  to fetch pixel values from buffer
  38  *
  39  * Note that in the STORE_PIXEL macros, we also pass in the (X,Y) coordinates
  40  * for the pixels to be stored.  This is useful when dithering and probably
  41  * ignored otherwise.
  42  */
  43
  44 #include "main/macros.h"
  45
  46
  47 #if !defined(RB_COMPONENTS)
  48 #define RB_COMPONENTS 4
  49 #endif
  50
  51
  52 static void
  53 NAME(get_row)( struct gl_context *ctx, struct gl_renderbuffer *rb,
  54                GLuint count, GLint x, GLint y, void *values )
  55 {
  56 #ifdef SPAN_VARS
  57    SPAN_VARS
  58 #endif
  59    RB_TYPE (*dest)[RB_COMPONENTS] = (RB_TYPE (*)[RB_COMPONENTS]) values;
  60    GLuint i;
  61    INIT_PIXEL_PTR(pixel, x, y);
  62    for (i = 0; i < count; i++) {
  63       FETCH_PIXEL(dest[i], pixel);
  64       INC_PIXEL_PTR(pixel);
  65    }
  66    (void) rb;
  67    (void) ctx;
  68 }
  69
  70
  71 static void
  72 NAME(get_values)( struct gl_context *ctx, struct gl_renderbuffer *rb,
  73                   GLuint count, const GLint x[], const GLint y[], void *values )
  74 {
  75 #ifdef SPAN_VARS
  76    SPAN_VARS
  77 #endif
  78    RB_TYPE (*dest)[RB_COMPONENTS] = (RB_TYPE (*)[RB_COMPONENTS]) values;
  79    GLuint i;
  80    for (i = 0; i < count; i++) {
  81       INIT_PIXEL_PTR(pixel, x[i], y[i]);
  82       FETCH_PIXEL(dest[i], pixel);
  83    }
  84    (void) rb;
  85    (void) ctx;
  86 }
  87
  88
  89 static void
  90 NAME(put_row)( struct gl_context *ctx, struct gl_renderbuffer *rb,
  91                GLuint count, GLint x, GLint y,
  92                const void *values, const GLubyte mask[] )
  93 {
  94 #ifdef SPAN_VARS
  95    SPAN_VARS
  96 #endif
  97    const RB_TYPE (*src)[RB_COMPONENTS] = (const RB_TYPE (*)[RB_COMPONENTS]) values;
  98    GLuint i;
  99    INIT_PIXEL_PTR(pixel, x, y);
 100    if (mask) {
 101       for (i = 0; i < count; i++) {
 102          if (mask[i]) {
 103             STORE_PIXEL(pixel, x + i, y, src[i]);
 104          }
 105          INC_PIXEL_PTR(pixel);
 106       }
 107    }
 108    else {
 109       for (i = 0; i < count; i++) {
 110          STORE_PIXEL(pixel, x + i, y, src[i]);
 111          INC_PIXEL_PTR(pixel);
 112       }
 113    }
 114    (void) rb;
 115    (void) ctx;
 116 }
 117
 118
 119 static void
 120 NAME(put_values)( struct gl_context *ctx, struct gl_renderbuffer *rb,
 121                   GLuint count, const GLint x[], const GLint y[],
 122                   const void *values, const GLubyte mask[] )
 123 {
 124 #ifdef SPAN_VARS
 125    SPAN_VARS
 126 #endif
 127    const RB_TYPE (*src)[RB_COMPONENTS] = (const RB_TYPE (*)[RB_COMPONENTS]) values;
 128    GLuint i;
 129    ASSERT(mask);
 130    for (i = 0; i < count; i++) {
 131       if (mask[i]) {
 132          INIT_PIXEL_PTR(pixel, x[i], y[i]);
 133          STORE_PIXEL(pixel, x[i], y[i], src[i]);
 134       }
 135    }
 136    (void) rb;
 137    (void) ctx;
 138 }
 139
 140
 141 #undef NAME
 142 #undef RB_TYPE
 143 #undef RB_COMPONENTS
 144 #undef SPAN_VARS
 145 #undef INIT_PIXEL_PTR
 146 #undef INC_PIXEL_PTR
 147 #undef STORE_PIXEL
 148 #undef STORE_PIXEL_RGB
 149 #undef FETCH_PIXEL