include/GL/osmesa.h

   1 /* $Id: osmesa.h,v 1.2 1999/11/24 18:43:19 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.3
   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  * Mesa Off-Screen rendering interface.
  30  *
  31  * This is an operating system and window system independent interface to
  32  * Mesa which allows one to render images into a client-supplied buffer in
  33  * main memory.  Such images may manipulated or saved in whatever way the
  34  * client wants.
  35  *
  36  * These are the API functions:
  37  *   OSMesaCreateContext - create a new Off-Screen Mesa rendering context
  38  *   OSMesaMakeCurrent - bind an OSMesaContext to a client's image buffer
  39  *                       and make the specified context the current one.
  40  *   OSMesaDestroyContext - destroy an OSMesaContext
  41  *   OSMesaGetCurrentContext - return thread's current context ID
  42  *   OSMesaPixelStore - controls how pixels are stored in image buffer
  43  *   OSMesaGetIntegerv - return OSMesa state parameters
  44  *
  45  *
  46  * The limits on the width and height of an image buffer are MAX_WIDTH and
  47  * MAX_HEIGHT as defined in Mesa/src/config.h.  Defaults are 1280 and 1024.
  48  * You can increase them as needed but beware that many temporary arrays in
  49  * Mesa are dimensioned by MAX_WIDTH or MAX_HEIGHT.
  50  */
  51
  52
  53
  54 #ifndef OSMESA_H
  55 #define OSMESA_H
  56
  57
  58
  59 #ifdef __cplusplus
  60 extern "C" {
  61 #endif
  62
  63
  64 #include "GL/gl.h"
  65
  66
  67
  68 #define OSMESA_MAJOR_VERSION 3
  69 #define OSMESA_MINOR_VERSION 3
  70
  71
  72
  73 /*
  74  * Values for the format parameter of OSMesaCreateContext()
  75  * New in version 2.0.
  76  */
  77 #define OSMESA_COLOR_INDEX      GL_COLOR_INDEX
  78 #define OSMESA_RGBA             GL_RGBA
  79 #define OSMESA_BGRA             0x1
  80 #define OSMESA_ARGB             0x2
  81 #define OSMESA_RGB              GL_RGB
  82 #define OSMESA_BGR              0x4
  83
  84
  85 /*
  86  * OSMesaPixelStore() parameters:
  87  * New in version 2.0.
  88  */
  89 #define OSMESA_ROW_LENGTH       0x10
  90 #define OSMESA_Y_UP             0x11
  91
  92
  93 /*
  94  * Accepted by OSMesaGetIntegerv:
  95  */
  96 #define OSMESA_WIDTH            0x20
  97 #define OSMESA_HEIGHT           0x21
  98 #define OSMESA_FORMAT           0x22
  99 #define OSMESA_TYPE             0x23
 100
 101
 102
 103 typedef struct osmesa_context *OSMesaContext;
 104
 105
 106 #if defined(__BEOS__) || defined(__QUICKDRAW__)
 107 #pragma export on
 108 #endif
 109
 110
 111 /*
 112  * Create an Off-Screen Mesa rendering context.  The only attribute needed is
 113  * an RGBA vs Color-Index mode flag.
 114  *
 115  * Input:  format - one of OSMESA_COLOR_INDEX, OSMESA_RGBA, OSMESA_BGRA,
 116  *                  OSMESA_ARGB, OSMESA_RGB, or OSMESA_BGR.
 117  *         sharelist - specifies another OSMesaContext with which to share
 118  *                     display lists.  NULL indicates no sharing.
 119  * Return:  an OSMesaContext or 0 if error
 120  */
 121 GLAPI OSMesaContext GLAPIENTRY OSMesaCreateContext( GLenum format,
 122                                           OSMesaContext sharelist );
 123
 124
 125
 126
 127 /*
 128  * Destroy an Off-Screen Mesa rendering context.
 129  *
 130  * Input:  ctx - the context to destroy
 131  */
 132 GLAPI void GLAPIENTRY OSMesaDestroyContext( OSMesaContext ctx );
 133
 134
 135
 136 /*
 137  * Bind an OSMesaContext to an image buffer.  The image buffer is just a
 138  * block of memory which the client provides.  Its size must be at least
 139  * as large as width*height*sizeof(type).  Its address should be a multiple
 140  * of 4 if using RGBA mode.
 141  *
 142  * Image data is stored in the order of glDrawPixels:  row-major order
 143  * with the lower-left image pixel stored in the first array position
 144  * (ie. bottom-to-top).
 145  *
 146  * Since the only type initially supported is GL_UNSIGNED_BYTE, if the
 147  * context is in RGBA mode, each pixel will be stored as a 4-byte RGBA
 148  * value.  If the context is in color indexed mode, each pixel will be
 149  * stored as a 1-byte value.
 150  *
 151  * If the context's viewport hasn't been initialized yet, it will now be
 152  * initialized to (0,0,width,height).
 153  *
 154  * Input:  ctx - the rendering context
 155  *         buffer - the image buffer memory
 156  *         type - data type for pixel components, only GL_UNSIGNED_BYTE
 157  *                supported now
 158  *         width, height - size of image buffer in pixels, at least 1
 159  * Return:  GL_TRUE if success, GL_FALSE if error because of invalid ctx,
 160  *          invalid buffer address, type!=GL_UNSIGNED_BYTE, width<1, height<1,
 161  *          width>internal limit or height>internal limit.
 162  */
 163 GLAPI GLboolean GLAPIENTRY OSMesaMakeCurrent( OSMesaContext ctx,
 164                                     void *buffer, GLenum type,
 165                                     GLsizei width, GLsizei height );
 166
 167
 168
 169
 170 /*
 171  * Return the current Off-Screen Mesa rendering context handle.
 172  */
 173 GLAPI OSMesaContext GLAPIENTRY OSMesaGetCurrentContext( void );
 174
 175
 176
 177 /*
 178  * Set pixel store/packing parameters for the current context.
 179  * This is similar to glPixelStore.
 180  * Input:  pname - OSMESA_ROW_LENGTH
 181  *                    specify actual pixels per row in image buffer
 182  *                    0 = same as image width (default)
 183  *                 OSMESA_Y_UP
 184  *                    zero = Y coordinates increase downward
 185  *                    non-zero = Y coordinates increase upward (default)
 186  *         value - the value for the parameter pname
 187  *
 188  * New in version 2.0.
 189  */
 190 GLAPI void GLAPIENTRY OSMesaPixelStore( GLint pname, GLint value );
 191
 192
 193
 194 /*
 195  * Return context info.  This is like glGetIntegerv.
 196  * Input:  pname -
 197  *                 OSMESA_WIDTH  return current image width
 198  *                 OSMESA_HEIGHT  return current image height
 199  *                 OSMESA_FORMAT  return image format
 200  *                 OSMESA_TYPE  return color component data type
 201  *                 OSMESA_ROW_LENGTH return row length in pixels
 202  *                 OSMESA_Y_UP returns 1 or 0 to indicate Y axis direction
 203  *         value - pointer to integer in which to return result.
 204  */
 205 GLAPI void GLAPIENTRY OSMesaGetIntegerv( GLint pname, GLint *value );
 206
 207
 208
 209 /*
 210  * Return the depth buffer associated with an OSMesa context.
 211  * Input:  c - the OSMesa context
 212  * Output:  width, height - size of buffer in pixels
 213  *          bytesPerValue - bytes per depth value (2 or 4)
 214  *          buffer - pointer to depth buffer values
 215  * Return:  GL_TRUE or GL_FALSE to indicate success or failure.
 216  *
 217  * New in Mesa 2.4.
 218  */
 219 GLAPI GLboolean GLAPIENTRY OSMesaGetDepthBuffer( OSMesaContext c,
 220                                        GLint *width, GLint *height,
 221                                        GLint *bytesPerValue, void **buffer );
 222
 223
 224
 225
 226 #if defined(__BEOS__) || defined(__QUICKDRAW__)
 227 #pragma export off
 228 #endif
 229
 230
 231 #ifdef __cplusplus
 232 }
 233 #endif
 234
 235
 236 #endif