src/mesa/drivers/x11/xm_buffer.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5
   4  *
   5  * Copyright (C) 1999-2005  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 #include "glxheader.h"
  27 #include "GL/xmesa.h"
  28 #include "xmesaP.h"
  29 #include "imports.h"
  30 #include "renderbuffer.h"
  31
  32
  33 static void
  34 xmesa_delete_renderbuffer(struct gl_renderbuffer *rb)
  35 {
  36    /* XXX Note: the ximage or Pixmap attached to this renderbuffer
  37     * should probably get freed here, but that's currently done in
  38     * XMesaDestroyBuffer().
  39     */
  40    _mesa_free(rb);
  41 }
  42
  43
  44 /**
  45  * Reallocate renderbuffer storage for front color buffer.
  46  */
  47 static GLboolean
  48 xmesa_alloc_front_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
  49                           GLenum internalFormat, GLuint width, GLuint height)
  50 {
  51    struct xmesa_renderbuffer *xrb = (struct xmesa_renderbuffer *) rb;
  52
  53    /* just clear these to be sure we don't accidentally use them */
  54    xrb->origin1 = NULL;
  55    xrb->origin2 = NULL;
  56    xrb->origin4 = NULL;
  57
  58    /* for the FLIP macro: */
  59    xrb->bottom = height - 1;
  60
  61    rb->Width = width;
  62    rb->Height = height;
  63    rb->InternalFormat = internalFormat;
  64
  65    return GL_TRUE;
  66 }
  67
  68
  69 /**
  70  * Reallocate renderbuffer storage for back color buffer.
  71  * XXX we should resize the back pixmap/ximage here.
  72  */
  73 static GLboolean
  74 xmesa_alloc_back_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
  75                          GLenum internalFormat, GLuint width, GLuint height)
  76 {
  77    struct xmesa_renderbuffer *xrb = (struct xmesa_renderbuffer *) rb;
  78
  79    /* same as front buffer */
  80    (void) xmesa_alloc_front_storage(ctx, rb, internalFormat, width, height);
  81
  82    /* plus... */
  83    if (xrb->ximage) {
  84       /* Needed by PIXELADDR1 macro */
  85       xrb->width1 = xrb->ximage->bytes_per_line;
  86       xrb->origin1 = (GLubyte *) xrb->ximage->data + xrb->width1 * (height - 1);
  87
  88       /* Needed by PIXELADDR2 macro */
  89       xrb->width2 = xrb->ximage->bytes_per_line / 2;
  90       xrb->origin2 = (GLushort *) xrb->ximage->data + xrb->width2 * (height - 1);
  91
  92       /* Needed by PIXELADDR3 macro */
  93       xrb->width3 = xrb->ximage->bytes_per_line;
  94       xrb->origin3 = (GLubyte *) xrb->ximage->data + xrb->width3 * (height - 1);
  95
  96       /* Needed by PIXELADDR4 macro */
  97       xrb->width4 = xrb->ximage->width;
  98       xrb->origin4 = (GLuint *) xrb->ximage->data + xrb->width4 * (height - 1);
  99    }
 100    else {
 101       /* this assertion will fail if we happend to run out of memory */
 102       /*assert(xrb->pixmap);*/
 103    }
 104
 105    return GL_TRUE;
 106 }
 107
 108
 109 struct xmesa_renderbuffer *
 110 xmesa_new_renderbuffer(GLcontext *ctx, GLuint name, GLboolean rgbMode,
 111                        GLboolean backBuffer)
 112 {
 113    struct xmesa_renderbuffer *xrb = CALLOC_STRUCT(xmesa_renderbuffer);
 114    if (xrb) {
 115       GLuint name = 0;
 116       _mesa_init_renderbuffer(&xrb->Base, name);
 117
 118       xrb->Base.Delete = xmesa_delete_renderbuffer;
 119       if (backBuffer)
 120          xrb->Base.AllocStorage = xmesa_alloc_back_storage;
 121       else
 122          xrb->Base.AllocStorage = xmesa_alloc_front_storage;
 123
 124       if (rgbMode) {
 125          xrb->Base.InternalFormat = GL_RGBA;
 126          xrb->Base._BaseFormat = GL_RGBA;
 127          xrb->Base.DataType = GL_UNSIGNED_BYTE;
 128       }
 129       else {
 130          xrb->Base.InternalFormat = GL_COLOR_INDEX;
 131          xrb->Base._BaseFormat = GL_COLOR_INDEX;
 132          xrb->Base.DataType = GL_UNSIGNED_INT;
 133       }
 134       /* only need to set Red/Green/EtcBits fields for user-created RBs */
 135    }
 136    return xrb;
 137 }
 138
 139
 140
 141