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/*
* Mesa 3-D graphics library
*
* Copyright (C) 2011 VMware, Inc.
*
* 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
* THE AUTHORS 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.
*/
/**
* Functions for mapping/unmapping texture images.
*/
#include "main/context.h"
#include "main/fbobject.h"
#include "swrast/swrast.h"
#include "swrast/s_context.h"
/**
* Error checking for debugging only.
*/
static void
_mesa_check_map_teximage(struct gl_texture_image *texImage,
GLuint slice, GLuint x, GLuint y, GLuint w, GLuint h)
{
if (texImage->TexObject->Target == GL_TEXTURE_1D)
assert(y == 0 && h == 1);
assert(x < texImage->Width || texImage->Width == 0);
assert(y < texImage->Height || texImage->Height == 0);
assert(x + w <= texImage->Width);
assert(y + h <= texImage->Height);
}
/**
* Map a 2D slice of a texture image into user space.
* (x,y,w,h) defines a region of interest (ROI). Reading/writing texels
* outside of the ROI is undefined.
*
* \param texImage the texture image
* \param slice the 3D image slice or array texture slice
* \param x, y, w, h region of interest
* \param mode bitmask of GL_MAP_READ_BIT, GL_MAP_WRITE_BIT
* \param mapOut returns start of mapping of region of interest
* \param rowStrideOut returns row stride (in bytes)
*/
void
_swrast_map_teximage(struct gl_context *ctx,
struct gl_texture_image *texImage,
GLuint slice,
GLuint x, GLuint y, GLuint w, GLuint h,
GLbitfield mode,
GLubyte **mapOut,
GLint *rowStrideOut)
{
GLubyte *map;
GLint stride, texelSize;
GLuint bw, bh;
_mesa_check_map_teximage(texImage, slice, x, y, w, h);
texelSize = _mesa_get_format_bytes(texImage->TexFormat);
stride = _mesa_format_row_stride(texImage->TexFormat, texImage->Width);
_mesa_get_format_block_size(texImage->TexFormat, &bw, &bh);
assert(texImage->Data);
map = texImage->Data;
if (texImage->TexObject->Target == GL_TEXTURE_3D ||
texImage->TexObject->Target == GL_TEXTURE_2D_ARRAY) {
GLuint sliceSize = _mesa_format_image_size(texImage->TexFormat,
texImage->Width,
texImage->Height,
1);
assert(slice < texImage->Depth);
map += slice * sliceSize;
}
/* apply x/y offset to map address */
map += stride * (y / bh) + texelSize * (x / bw);
*mapOut = map;
*rowStrideOut = stride;
}
void
_swrast_unmap_teximage(struct gl_context *ctx,
struct gl_texture_image *texImage,
GLuint slice)
{
/* nop */
}
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