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/*
* Copyright (C) 2011 LunarG, 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 (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 NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS 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.
*/
/**
* \file texcompress_etc.c
* GL_OES_compressed_ETC1_RGB8_texture support.
*/
#include "mfeatures.h"
#include "texcompress.h"
#include "texcompress_etc.h"
#include "texstore.h"
#include "macros.h"
#include "swrast/s_context.h"
GLboolean
_mesa_texstore_etc1_rgb8(TEXSTORE_PARAMS)
{
/* GL_ETC1_RGB8_OES is only valid in glCompressedTexImage2D */
ASSERT(0);
return GL_FALSE;
}
/* define etc1_parse_block and etc. */
#define UINT8_TYPE GLubyte
#define TAG(x) x
#include "texcompress_etc_tmp.h"
#undef TAG
#undef UINT8_TYPE
void
_mesa_fetch_texel_2d_f_etc1_rgb8(const struct swrast_texture_image *texImage,
GLint i, GLint j, GLint k, GLfloat *texel)
{
struct etc1_block block;
GLubyte dst[3];
const GLubyte *src;
src = (const GLubyte *) texImage->Map +
(((texImage->RowStride + 3) / 4) * (j / 4) + (i / 4)) * 8;
etc1_parse_block(&block, src);
etc1_fetch_texel(&block, i % 4, j % 4, dst);
texel[RCOMP] = UBYTE_TO_FLOAT(dst[0]);
texel[GCOMP] = UBYTE_TO_FLOAT(dst[1]);
texel[BCOMP] = UBYTE_TO_FLOAT(dst[2]);
texel[ACOMP] = 1.0f;
}
/**
* Decode texture data in format `MESA_FORMAT_ETC1_RGB8` to
* `MESA_FORMAT_ABGR8888`.
*
* The size of the source data must be a multiple of the ETC1 block size,
* which is 8, even if the texture image's dimensions are not aligned to 4.
* From the GL_OES_compressed_ETC1_RGB8_texture spec:
* The texture is described as a number of 4x4 pixel blocks. If the
* texture (or a particular mip-level) is smaller than 4 pixels in
* any dimension (such as a 2x2 or a 8x1 texture), the texture is
* found in the upper left part of the block(s), and the rest of the
* pixels are not used. For instance, a texture of size 4x2 will be
* placed in the upper half of a 4x4 block, and the lower half of the
* pixels in the block will not be accessed.
*
* \param src_width in pixels
* \param src_height in pixels
* \param dst_stride in bytes
*/
void
_mesa_etc1_unpack_rgba8888(uint8_t *dst_row,
unsigned dst_stride,
const uint8_t *src_row,
unsigned src_stride,
unsigned src_width,
unsigned src_height)
{
etc1_unpack_rgba8888(dst_row, dst_stride,
src_row, src_stride,
src_width, src_height);
}
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