151f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu/* 251f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu * Copyright (C) 2011 LunarG, Inc. 351f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu * 451f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu * Permission is hereby granted, free of charge, to any person obtaining a 551f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu * copy of this software and associated documentation files (the "Software"), 651f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu * to deal in the Software without restriction, including without limitation 751f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu * the rights to use, copy, modify, merge, publish, distribute, sublicense, 851f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu * and/or sell copies of the Software, and to permit persons to whom the 951f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu * Software is furnished to do so, subject to the following conditions: 1051f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu * 1151f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu * The above copyright notice and this permission notice (including the next 1251f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu * paragraph) shall be included in all copies or substantial portions of the 1351f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu * Software. 1451f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu * 1551f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 1651f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 1751f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 1851f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 1951f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 2051f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 2151f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu * DEALINGS IN THE SOFTWARE. 2251f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu */ 2351f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu 2451f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu/** 2551f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu * \file texcompress_etc.c 2651f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu * GL_OES_compressed_ETC1_RGB8_texture support. 2751f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu */ 2851f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu 2951f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu 3051f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu#include "mfeatures.h" 3151f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu#include "texcompress.h" 3251f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu#include "texcompress_etc.h" 3351f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu#include "texstore.h" 3451f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu#include "macros.h" 3551f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu#include "swrast/s_context.h" 3651f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu 3751f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I WuGLboolean 3851f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu_mesa_texstore_etc1_rgb8(TEXSTORE_PARAMS) 3951f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu{ 4051f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu /* GL_ETC1_RGB8_OES is only valid in glCompressedTexImage2D */ 4151f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu ASSERT(0); 4251f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu 4351f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu return GL_FALSE; 4451f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu} 4551f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu 4651f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu/* define etc1_parse_block and etc. */ 4751f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu#define UINT8_TYPE GLubyte 4851f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu#define TAG(x) x 4951f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu#include "texcompress_etc_tmp.h" 5051f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu#undef TAG 5151f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu#undef UINT8_TYPE 5251f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu 5351f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wuvoid 5451f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu_mesa_fetch_texel_2d_f_etc1_rgb8(const struct swrast_texture_image *texImage, 5551f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu GLint i, GLint j, GLint k, GLfloat *texel) 5651f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu{ 5751f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu struct etc1_block block; 5851f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu GLubyte dst[3]; 5951f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu const GLubyte *src; 6051f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu 61bd3c10c0f0c60ab3421c2da2eab814edc2296cb0Brian Paul src = (const GLubyte *) texImage->Map + 6251f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu (((texImage->RowStride + 3) / 4) * (j / 4) + (i / 4)) * 8; 6351f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu 6451f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu etc1_parse_block(&block, src); 6551f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu etc1_fetch_texel(&block, i % 4, j % 4, dst); 6651f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu 6751f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu texel[RCOMP] = UBYTE_TO_FLOAT(dst[0]); 6851f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu texel[GCOMP] = UBYTE_TO_FLOAT(dst[1]); 6951f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu texel[BCOMP] = UBYTE_TO_FLOAT(dst[2]); 7051f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu texel[ACOMP] = 1.0f; 7151f4d2725417088c75d512b69a31a26ae5cb3ef2Chia-I Wu} 728ec721264c7ae0f73a520362963b2691bf098b9bChad Versace 738ec721264c7ae0f73a520362963b2691bf098b9bChad Versace/** 748ec721264c7ae0f73a520362963b2691bf098b9bChad Versace * Decode texture data in format `MESA_FORMAT_ETC1_RGB8` to 758ec721264c7ae0f73a520362963b2691bf098b9bChad Versace * `MESA_FORMAT_ABGR8888`. 768ec721264c7ae0f73a520362963b2691bf098b9bChad Versace * 778ec721264c7ae0f73a520362963b2691bf098b9bChad Versace * The size of the source data must be a multiple of the ETC1 block size, 788ec721264c7ae0f73a520362963b2691bf098b9bChad Versace * which is 8, even if the texture image's dimensions are not aligned to 4. 798ec721264c7ae0f73a520362963b2691bf098b9bChad Versace * From the GL_OES_compressed_ETC1_RGB8_texture spec: 808ec721264c7ae0f73a520362963b2691bf098b9bChad Versace * The texture is described as a number of 4x4 pixel blocks. If the 818ec721264c7ae0f73a520362963b2691bf098b9bChad Versace * texture (or a particular mip-level) is smaller than 4 pixels in 828ec721264c7ae0f73a520362963b2691bf098b9bChad Versace * any dimension (such as a 2x2 or a 8x1 texture), the texture is 838ec721264c7ae0f73a520362963b2691bf098b9bChad Versace * found in the upper left part of the block(s), and the rest of the 848ec721264c7ae0f73a520362963b2691bf098b9bChad Versace * pixels are not used. For instance, a texture of size 4x2 will be 858ec721264c7ae0f73a520362963b2691bf098b9bChad Versace * placed in the upper half of a 4x4 block, and the lower half of the 868ec721264c7ae0f73a520362963b2691bf098b9bChad Versace * pixels in the block will not be accessed. 878ec721264c7ae0f73a520362963b2691bf098b9bChad Versace * 888ec721264c7ae0f73a520362963b2691bf098b9bChad Versace * \param src_width in pixels 898ec721264c7ae0f73a520362963b2691bf098b9bChad Versace * \param src_height in pixels 908ec721264c7ae0f73a520362963b2691bf098b9bChad Versace * \param dst_stride in bytes 918ec721264c7ae0f73a520362963b2691bf098b9bChad Versace */ 928ec721264c7ae0f73a520362963b2691bf098b9bChad Versacevoid 938ec721264c7ae0f73a520362963b2691bf098b9bChad Versace_mesa_etc1_unpack_rgba8888(uint8_t *dst_row, 948ec721264c7ae0f73a520362963b2691bf098b9bChad Versace unsigned dst_stride, 958ec721264c7ae0f73a520362963b2691bf098b9bChad Versace const uint8_t *src_row, 968ec721264c7ae0f73a520362963b2691bf098b9bChad Versace unsigned src_stride, 978ec721264c7ae0f73a520362963b2691bf098b9bChad Versace unsigned src_width, 988ec721264c7ae0f73a520362963b2691bf098b9bChad Versace unsigned src_height) 998ec721264c7ae0f73a520362963b2691bf098b9bChad Versace{ 1008ec721264c7ae0f73a520362963b2691bf098b9bChad Versace etc1_unpack_rgba8888(dst_row, dst_stride, 1018ec721264c7ae0f73a520362963b2691bf098b9bChad Versace src_row, src_stride, 1028ec721264c7ae0f73a520362963b2691bf098b9bChad Versace src_width, src_height); 1038ec721264c7ae0f73a520362963b2691bf098b9bChad Versace} 104