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/**************************************************************************
*
* Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
* 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, sub license, 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 (including the
* next paragraph) 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 NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
*
**************************************************************************/
/**
* Software Z buffer/surface.
*
* \author Brian Paul
*/
#include "main/imports.h"
#include "pipe/p_state.h"
#include "pipe/p_defines.h"
#include "sp_surface.h"
#include "sp_z_surface.h"
static void*
z16_map(struct pipe_buffer *pb, GLuint access_mode)
{
struct softpipe_surface *sps = (struct softpipe_surface *) pb;
sps->surface.ptr = pb->ptr;
return pb->ptr;
}
static void
z16_unmap(struct pipe_buffer *pb)
{
struct softpipe_surface *sps = (struct softpipe_surface *) pb;
sps->surface.ptr = NULL;
}
static void
z16_resize(struct pipe_surface *ps, GLuint width, GLuint height)
{
struct softpipe_surface *sps = (struct softpipe_surface *) ps;
if (sps->surface.buffer.ptr)
free(sps->surface.buffer.ptr);
ps->buffer.ptr = (GLubyte *) malloc(width * height * sizeof(GLushort));
ps->width = width;
ps->height = height;
sps->surface.stride = sps->surface.width;
sps->surface.cpp = 2;
}
static void
z16_read_quad_z(struct softpipe_surface *sps,
GLint x, GLint y, GLuint zzzz[QUAD_SIZE])
{
const GLushort *src
= (GLushort *) sps->surface.ptr + y * sps->surface.stride + x;
/* converting GLushort to GLuint: */
zzzz[0] = src[0];
zzzz[1] = src[1];
zzzz[2] = src[sps->surface.width];
zzzz[3] = src[sps->surface.width + 1];
}
static void
z16_write_quad_z(struct softpipe_surface *sps,
GLint x, GLint y, const GLuint zzzz[QUAD_SIZE])
{
GLushort *dst = (GLushort *) sps->surface.ptr + y * sps->surface.stride + x;
/* converting GLuint to GLushort: */
dst[0] = zzzz[0];
dst[1] = zzzz[1];
dst[sps->surface.width] = zzzz[2];
dst[sps->surface.width + 1] = zzzz[3];
}
struct softpipe_surface *
softpipe_new_z_surface(GLuint depth)
{
struct softpipe_surface *sps = CALLOC_STRUCT(softpipe_surface);
if (!sps)
return NULL;
/* XXX ignoring depth param for now */
sps->surface.format = PIPE_FORMAT_U_Z16;
sps->surface.resize = z16_resize;
sps->surface.buffer.map = z16_map;
sps->surface.buffer.unmap = z16_unmap;
sps->read_quad_z = z16_read_quad_z;
sps->write_quad_z = z16_write_quad_z;
return sps;
}
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