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/*
* Mesa 3-D graphics library
* Version: 6.5
*
* Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "glxheader.h"
#include "GL/xmesa.h"
#include "xmesaP.h"
#include "imports.h"
#include "renderbuffer.h"
static void
xmesa_delete_renderbuffer(struct gl_renderbuffer *rb)
{
/* XXX Note: the ximage or Pixmap attached to this renderbuffer
* should probably get freed here, but that's currently done in
* XMesaDestroyBuffer().
*/
_mesa_free(rb);
}
/**
* Reallocate renderbuffer storage for front color buffer.
*/
static GLboolean
xmesa_alloc_front_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
GLenum internalFormat, GLuint width, GLuint height)
{
struct xmesa_renderbuffer *xrb = (struct xmesa_renderbuffer *) rb;
/* just clear these to be sure we don't accidentally use them */
xrb->origin1 = NULL;
xrb->origin2 = NULL;
xrb->origin4 = NULL;
/* for the FLIP macro: */
xrb->bottom = height - 1;
rb->Width = width;
rb->Height = height;
rb->InternalFormat = internalFormat;
return GL_TRUE;
}
/**
* Reallocate renderbuffer storage for back color buffer.
* XXX we should resize the back pixmap/ximage here.
*/
static GLboolean
xmesa_alloc_back_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
GLenum internalFormat, GLuint width, GLuint height)
{
struct xmesa_renderbuffer *xrb = (struct xmesa_renderbuffer *) rb;
/* same as front buffer */
(void) xmesa_alloc_front_storage(ctx, rb, internalFormat, width, height);
/* plus... */
if (xrb->ximage) {
/* Needed by PIXELADDR1 macro */
xrb->width1 = xrb->ximage->bytes_per_line;
xrb->origin1 = (GLubyte *) xrb->ximage->data + xrb->width1 * (height - 1);
/* Needed by PIXELADDR2 macro */
xrb->width2 = xrb->ximage->bytes_per_line / 2;
xrb->origin2 = (GLushort *) xrb->ximage->data + xrb->width2 * (height - 1);
/* Needed by PIXELADDR3 macro */
xrb->width3 = xrb->ximage->bytes_per_line;
xrb->origin3 = (GLubyte *) xrb->ximage->data + xrb->width3 * (height - 1);
/* Needed by PIXELADDR4 macro */
xrb->width4 = xrb->ximage->width;
xrb->origin4 = (GLuint *) xrb->ximage->data + xrb->width4 * (height - 1);
}
else {
/* this assertion will fail if we happend to run out of memory */
/*assert(xrb->pixmap);*/
}
return GL_TRUE;
}
struct xmesa_renderbuffer *
xmesa_new_renderbuffer(GLcontext *ctx, GLuint name, const GLvisual *visual,
GLboolean backBuffer)
{
struct xmesa_renderbuffer *xrb = CALLOC_STRUCT(xmesa_renderbuffer);
if (xrb) {
GLuint name = 0;
_mesa_init_renderbuffer(&xrb->Base, name);
xrb->Base.Delete = xmesa_delete_renderbuffer;
if (backBuffer)
xrb->Base.AllocStorage = xmesa_alloc_back_storage;
else
xrb->Base.AllocStorage = xmesa_alloc_front_storage;
if (visual->rgbMode) {
xrb->Base.InternalFormat = GL_RGBA;
xrb->Base._BaseFormat = GL_RGBA;
xrb->Base.DataType = GL_UNSIGNED_BYTE;
xrb->Base.RedBits = visual->redBits;
xrb->Base.GreenBits = visual->greenBits;
xrb->Base.BlueBits = visual->blueBits;
xrb->Base.AlphaBits = visual->alphaBits;
}
else {
xrb->Base.InternalFormat = GL_COLOR_INDEX;
xrb->Base._BaseFormat = GL_COLOR_INDEX;
xrb->Base.DataType = GL_UNSIGNED_INT;
xrb->Base.IndexBits = visual->indexBits;
}
/* only need to set Red/Green/EtcBits fields for user-created RBs */
}
return xrb;
}
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