src/mesa/drivers/x11/xm_buffer.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.3
   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 this routine should really delete the attached ximage, etc. */
  37 }
  38
  39
  40 /**
  41  * Reallocate renderbuffer storage.
  42  * This is called when the window's resized.  It'll get called once for
  43  * the front color renderbuffer and again for the back color renderbuffer.
  44  */
  45 static GLboolean
  46 xmesa_alloc_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
  47                     GLenum internalFormat, GLuint width, GLuint height)
  48 {
  49    struct xmesa_renderbuffer *xrb = (struct xmesa_renderbuffer *) rb;
  50
  51    if (xrb->ximage) {
  52       /* Needed by PIXELADDR1 macro */
  53       xrb->width1 = xrb->ximage->bytes_per_line;
  54       xrb->origin1 = (GLubyte *) xrb->ximage->data + xrb->width1 * (height - 1);
  55
  56       /* Needed by PIXELADDR2 macro */
  57       xrb->width2 = xrb->ximage->bytes_per_line / 2;
  58       xrb->origin2 = (GLushort *) xrb->ximage->data + xrb->width2 * (height - 1);
  59
  60       /* Needed by PIXELADDR3 macro */
  61       xrb->width3 = xrb->ximage->bytes_per_line;
  62       xrb->origin3 = (GLubyte *) xrb->ximage->data + xrb->width3 * (height - 1);
  63
  64       /* Needed by PIXELADDR4 macro */
  65       xrb->width4 = xrb->ximage->width;
  66       xrb->origin4 = (GLuint *) xrb->ximage->data + xrb->width4 * (height - 1);
  67    }
  68    else {
  69       assert(xrb->pixmap);
  70    }
  71
  72    /* for the FLIP macro: */
  73    xrb->bottom = height - 1;
  74
  75    rb->Width = width;
  76    rb->Height = height;
  77    rb->InternalFormat = internalFormat;
  78
  79    return GL_TRUE;
  80 }
  81
  82
  83 struct xmesa_renderbuffer *
  84 xmesa_new_renderbuffer(GLcontext *ctx, GLuint name, GLboolean rgbMode)
  85 {
  86    struct xmesa_renderbuffer *xrb = CALLOC_STRUCT(xmesa_renderbuffer);
  87    if (xrb) {
  88       GLuint name = 0;
  89       _mesa_init_renderbuffer(&xrb->Base, name);
  90
  91       xrb->Base.Delete = xmesa_delete_renderbuffer;
  92       xrb->Base.AllocStorage = xmesa_alloc_storage;
  93
  94       if (rgbMode) {
  95          xrb->Base.InternalFormat = GL_RGBA;
  96          xrb->Base._BaseFormat = GL_RGBA;
  97          xrb->Base.DataType = GL_UNSIGNED_BYTE;
  98       }
  99       else {
 100          xrb->Base.InternalFormat = GL_COLOR_INDEX;
 101          xrb->Base._BaseFormat = GL_COLOR_INDEX;
 102          xrb->Base.DataType = GL_UNSIGNED_INT;
 103       }
 104       xrb->Base.ComponentSizes[0] = 0; /* XXX fix? */
 105    }
 106    return xrb;
 107 }
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