/* * Mesa 3-D graphics library * Version: 7.7 * * Copyright (C) 1999-2008 Brian Paul All Rights Reserved. * Copyright (c) 2009 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 * 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. */ /** * \file texfetch.c * * Texel fetch/store functions * * \author Gareth Hughes */ #include "colormac.h" #include "macros.h" #include "texcompress.h" #include "texcompress_fxt1.h" #include "texcompress_s3tc.h" #include "texfetch.h" /** * Convert an 8-bit sRGB value from non-linear space to a * linear RGB value in [0, 1]. * Implemented with a 256-entry lookup table. */ static INLINE GLfloat nonlinear_to_linear(GLubyte cs8) { static GLfloat table[256]; static GLboolean tableReady = GL_FALSE; if (!tableReady) { /* compute lookup table now */ GLuint i; for (i = 0; i < 256; i++) { const GLfloat cs = UBYTE_TO_FLOAT(i); if (cs <= 0.04045) { table[i] = cs / 12.92f; } else { table[i] = (GLfloat) pow((cs + 0.055) / 1.055, 2.4); } } tableReady = GL_TRUE; } return table[cs8]; } /* Texel fetch routines for all supported formats */ #define DIM 1 #include "texfetch_tmp.h" #define DIM 2 #include "texfetch_tmp.h" #define DIM 3 #include "texfetch_tmp.h" /** * Null texel fetch function. * * Have to have this so the FetchTexel function pointer is never NULL. */ static void fetch_null_texelf( const struct gl_texture_image *texImage, GLint i, GLint j, GLint k, GLfloat *texel ) { (void) texImage; (void) i; (void) j; (void) k; texel[RCOMP] = 0.0; texel[GCOMP] = 0.0; texel[BCOMP] = 0.0; texel[ACOMP] = 0.0; _mesa_warning(NULL, "fetch_null_texelf() called!"); } static void store_null_texel(struct gl_texture_image *texImage, GLint i, GLint j, GLint k, const void *texel) { (void) texImage; (void) i; (void) j; (void) k; (void) texel; /* no-op */ } /** * Table to map MESA_FORMAT_ to texel fetch/store funcs. * XXX this is somewhat temporary. */ static struct { gl_format Name; FetchTexelFuncF Fetch1D; FetchTexelFuncF Fetch2D; FetchTexelFuncF Fetch3D; StoreTexelFunc StoreTexel; } texfetch_funcs[MESA_FORMAT_COUNT] = { { MESA_FORMAT_NONE, fetch_null_texelf, fetch_null_texelf, fetch_null_texelf, store_null_texel }, { MESA_FORMAT_RGBA8888, fetch_texel_1d_f_rgba8888, fetch_texel_2d_f_rgba8888, fetch_texel_3d_f_rgba8888, store_texel_rgba8888 }, { MESA_FORMAT_RGBA8888_REV, fetch_texel_1d_f_rgba8888_rev, fetch_texel_2d_f_rgba8888_rev, fetch_texel_3d_f_rgba8888_rev, store_texel_rgba8888_rev }, { MESA_FORMAT_ARGB8888, fetch_texel_1d_f_argb8888, fetch_texel_2d_f_argb8888, fetch_texel_3d_f_argb8888, store_texel_argb8888 }, { MESA_FORMAT_ARGB8888_REV, fetch_texel_1d_f_argb8888_rev, fetch_texel_2d_f_argb8888_rev, fetch_texel_3d_f_argb8888_rev, store_texel_argb8888_rev }, { MESA_FORMAT_XRGB8888, fetch_texel_1d_f_xrgb8888, fetch_texel_2d_f_xrgb8888, fetch_texel_3d_f_xrgb8888, store_texel_xrgb8888 }, { MESA_FORMAT_XRGB8888_REV, fetch_texel_1d_f_xrgb8888_rev, fetch_texel_2d_f_xrgb8888_rev, fetch_texel_3d_f_xrgb8888_rev, store_texel_xrgb8888_rev, }, { MESA_FORMAT_RGB888, fetch_texel_1d_f_rgb888, fetch_texel_2d_f_rgb888, fetch_texel_3d_f_rgb888, store_texel_rgb888 }, { MESA_FORMAT_BGR888, fetch_texel_1d_f_bgr888, fetch_texel_2d_f_bgr888, fetch_texel_3d_f_bgr888, store_texel_bgr888 }, { MESA_FORMAT_RGB565, fetch_texel_1d_f_rgb565, fetch_texel_2d_f_rgb565, fetch_texel_3d_f_rgb565, store_texel_rgb565 }, { MESA_FORMAT_RGB565_REV, fetch_texel_1d_f_rgb565_rev, fetch_texel_2d_f_rgb565_rev, fetch_texel_3d_f_rgb565_rev, store_texel_rgb565_rev }, { MESA_FORMAT_ARGB4444, fetch_texel_1d_f_argb4444, fetch_texel_2d_f_argb4444, fetch_texel_3d_f_argb4444, store_texel_argb4444 }, { MESA_FORMAT_ARGB4444_REV, fetch_texel_1d_f_argb4444_rev, fetch_texel_2d_f_argb4444_rev, fetch_texel_3d_f_argb4444_rev, store_texel_argb4444_rev }, { MESA_FORMAT_RGBA5551, fetch_texel_1d_f_rgba5551, fetch_texel_2d_f_rgba5551, fetch_texel_3d_f_rgba5551, store_texel_rgba5551 }, { MESA_FORMAT_ARGB1555, fetch_texel_1d_f_argb1555, fetch_texel_2d_f_argb1555, fetch_texel_3d_f_argb1555, store_texel_argb1555 }, { MESA_FORMAT_ARGB1555_REV, fetch_texel_1d_f_argb1555_rev, fetch_texel_2d_f_argb1555_rev, fetch_texel_3d_f_argb1555_rev, store_texel_argb1555_rev }, { MESA_FORMAT_AL44, fetch_texel_1d_f_al44, fetch_texel_2d_f_al44, fetch_texel_3d_f_al44, store_texel_al44 }, { MESA_FORMAT_AL88, fetch_texel_1d_f_al88, fetch_texel_2d_f_al88, fetch_texel_3d_f_al88, store_texel_al88 }, { MESA_FORMAT_AL88_REV, fetch_texel_1d_f_al88_rev, fetch_texel_2d_f_al88_rev, fetch_texel_3d_f_al88_rev, store_texel_al88_rev }, { MESA_FORMAT_AL1616, fetch_texel_1d_f_al1616, fetch_texel_2d_f_al1616, fetch_texel_3d_f_al1616, store_texel_al1616 }, { MESA_FORMAT_AL1616_REV, fetch_texel_1d_f_al1616_rev, fetch_texel_2d_f_al1616_rev, fetch_texel_3d_f_al1616_rev, store_texel_al1616_rev }, { MESA_FORMAT_RGB332, fetch_texel_1d_f_rgb332, fetch_texel_2d_f_rgb332, fetch_texel_3d_f_rgb332, store_texel_rgb332 }, { MESA_FORMAT_A8, fetch_texel_1d_f_a8, fetch_texel_2d_f_a8, fetch_texel_3d_f_a8, store_texel_a8 }, { MESA_FORMAT_L8, fetch_texel_1d_f_l8, fetch_texel_2d_f_l8, fetch_texel_3d_f_l8, store_texel_l8 }, { MESA_FORMAT_I8, fetch_texel_1d_f_i8, fetch_texel_2d_f_i8, fetch_texel_3d_f_i8, store_texel_i8 }, { MESA_FORMAT_CI8, fetch_texel_1d_f_ci8, fetch_texel_2d_f_ci8, fetch_texel_3d_f_ci8, store_texel_ci8 }, { MESA_FORMAT_YCBCR, fetch_texel_1d_f_ycbcr, fetch_texel_2d_f_ycbcr, fetch_texel_3d_f_ycbcr, store_texel_ycbcr }, { MESA_FORMAT_YCBCR_REV, fetch_texel_1d_f_ycbcr_rev, fetch_texel_2d_f_ycbcr_rev, fetch_texel_3d_f_ycbcr_rev, store_texel_ycbcr_rev }, { MESA_FORMAT_R8, fetch_texel_1d_f_r8, fetch_texel_2d_f_r8, fetch_texel_3d_f_r8, store_texel_r8, }, { MESA_FORMAT_RG88, fetch_texel_1d_f_rg88, fetch_texel_2d_f_rg88, fetch_texel_3d_f_rg88, store_texel_rg88, }, { MESA_FORMAT_RG88_REV, fetch_texel_1d_f_rg88_rev, fetch_texel_2d_f_rg88_rev, fetch_texel_3d_f_rg88_rev, store_texel_rg88_rev, }, { MESA_FORMAT_R16, fetch_texel_1d_f_r16, fetch_texel_2d_f_r16, fetch_texel_3d_f_r16, store_texel_r16, }, { MESA_FORMAT_RG1616, fetch_texel_1d_f_rg1616, fetch_texel_2d_f_rg1616, fetch_texel_3d_f_rg1616, store_texel_rg1616, }, { MESA_FORMAT_RG1616_REV, fetch_texel_1d_f_rg1616_rev, fetch_texel_2d_f_rg1616_rev, fetch_texel_3d_f_rg1616_rev, store_texel_rg1616_rev, }, { MESA_FORMAT_ARGB2101010, fetch_texel_1d_f_argb2101010, fetch_texel_2d_f_argb2101010, fetch_texel_3d_f_argb2101010, store_texel_argb2101010 }, { MESA_FORMAT_Z24_S8, fetch_texel_1d_f_z24_s8, fetch_texel_2d_f_z24_s8, fetch_texel_3d_f_z24_s8, store_texel_z24_s8 }, { MESA_FORMAT_S8_Z24, fetch_texel_1d_f_s8_z24, fetch_texel_2d_f_s8_z24, fetch_texel_3d_f_s8_z24, store_texel_s8_z24 }, { MESA_FORMAT_Z16, fetch_texel_1d_f_z16, fetch_texel_2d_f_z16, fetch_texel_3d_f_z16, store_texel_z16 }, { MESA_FORMAT_X8_Z24, fetch_texel_1d_f_s8_z24, fetch_texel_2d_f_s8_z24, fetch_texel_3d_f_s8_z24, store_texel_s8_z24 }, { MESA_FORMAT_Z24_X8, fetch_texel_1d_f_z24_s8, fetch_texel_2d_f_z24_s8, fetch_texel_3d_f_z24_s8, store_texel_z24_s8 }, { MESA_FORMAT_Z32, fetch_texel_1d_f_z32, fetch_texel_2d_f_z32, fetch_texel_3d_f_z32, store_texel_z32 }, { MESA_FORMAT_S8, NULL, NULL, NULL, NULL }, { MESA_FORMAT_SRGB8, fetch_texel_1d_srgb8, fetch_texel_2d_srgb8, fetch_texel_3d_srgb8, store_texel_srgb8 }, { MESA_FORMAT_SRGBA8, fetch_texel_1d_srgba8, fetch_texel_2d_srgba8, fetch_texel_3d_srgba8, store_texel_srgba8 }, { MESA_FORMAT_SARGB8, fetch_texel_1d_sargb8, fetch_texel_2d_sargb8, fetch_texel_3d_sargb8, store_texel_sargb8 }, { MESA_FORMAT_SL8, fetch_texel_1d_sl8, fetch_texel_2d_sl8, fetch_texel_3d_sl8, store_texel_sl8 }, { MESA_FORMAT_SLA8, fetch_texel_1d_sla8, fetch_texel_2d_sla8, fetch_texel_3d_sla8, store_texel_sla8 }, { MESA_FORMAT_SRGB_DXT1, NULL, _mesa_fetch_texel_2d_f_srgb_dxt1, NULL, NULL }, { MESA_FORMAT_SRGBA_DXT1, NULL, _mesa_fetch_texel_2d_f_srgba_dxt1, NULL, NULL }, { MESA_FORMAT_SRGBA_DXT3, NULL, _mesa_fetch_texel_2d_f_srgba_dxt3, NULL, NULL }, { MESA_FORMAT_SRGBA_DXT5, NULL, _mesa_fetch_texel_2d_f_srgba_dxt5, NULL, NULL }, { MESA_FORMAT_RGB_FXT1, NULL, _mesa_fetch_texel_2d_f_rgb_fxt1, NULL, NULL }, { MESA_FORMAT_RGBA_FXT1, NULL, _mesa_fetch_texel_2d_f_rgba_fxt1, NULL, NULL }, { MESA_FORMAT_RGB_DXT1, NULL, _mesa_fetch_texel_2d_f_rgb_dxt1, NULL, NULL }, { MESA_FORMAT_RGBA_DXT1, NULL, _mesa_fetch_texel_2d_f_rgba_dxt1, NULL, NULL }, { MESA_FORMAT_RGBA_DXT3, NULL, _mesa_fetch_texel_2d_f_rgba_dxt3, NULL, NULL }, { MESA_FORMAT_RGBA_DXT5, NULL, _mesa_fetch_texel_2d_f_rgba_dxt5, NULL, NULL }, { MESA_FORMAT_RGBA_FLOAT32, fetch_texel_1d_f_rgba_f32, fetch_texel_2d_f_rgba_f32, fetch_texel_3d_f_rgba_f32, store_texel_rgba_f32 }, { MESA_FORMAT_RGBA_FLOAT16, fetch_texel_1d_f_rgba_f16, fetch_texel_2d_f_rgba_f16, fetch_texel_3d_f_rgba_f16, store_texel_rgba_f16 }, { MESA_FORMAT_RGB_FLOAT32, fetch_texel_1d_f_rgb_f32, fetch_texel_2d_f_rgb_f32, fetch_texel_3d_f_rgb_f32, store_texel_rgb_f32 }, { MESA_FORMAT_RGB_FLOAT16, fetch_texel_1d_f_rgb_f16, fetch_texel_2d_f_rgb_f16, fetch_texel_3d_f_rgb_f16, store_texel_rgb_f16 }, { MESA_FORMAT_ALPHA_FLOAT32, fetch_texel_1d_f_alpha_f32, fetch_texel_2d_f_alpha_f32, fetch_texel_3d_f_alpha_f32, store_texel_alpha_f32 }, { MESA_FORMAT_ALPHA_FLOAT16, fetch_texel_1d_f_alpha_f16, fetch_texel_2d_f_alpha_f16, fetch_texel_3d_f_alpha_f16, store_texel_alpha_f16 }, { MESA_FORMAT_LUMINANCE_FLOAT32, fetch_texel_1d_f_luminance_f32, fetch_texel_2d_f_luminance_f32, fetch_texel_3d_f_luminance_f32, store_texel_luminance_f32 }, { MESA_FORMAT_LUMINANCE_FLOAT16, fetch_texel_1d_f_luminance_f16, fetch_texel_2d_f_luminance_f16, fetch_texel_3d_f_luminance_f16, store_texel_luminance_f16 }, { MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32, fetch_texel_1d_f_luminance_alpha_f32, fetch_texel_2d_f_luminance_alpha_f32, fetch_texel_3d_f_luminance_alpha_f32, store_texel_luminance_alpha_f32 }, { MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16, fetch_texel_1d_f_luminance_alpha_f16, fetch_texel_2d_f_luminance_alpha_f16, fetch_texel_3d_f_luminance_alpha_f16, store_texel_luminance_alpha_f16 }, { MESA_FORMAT_INTENSITY_FLOAT32, fetch_texel_1d_f_intensity_f32, fetch_texel_2d_f_intensity_f32, fetch_texel_3d_f_intensity_f32, store_texel_intensity_f32 }, { MESA_FORMAT_INTENSITY_FLOAT16, fetch_texel_1d_f_intensity_f16, fetch_texel_2d_f_intensity_f16, fetch_texel_3d_f_intensity_f16, store_texel_intensity_f16 }, /* non-normalized, signed int */ { MESA_FORMAT_RGBA_INT8, fetch_texel_1d_rgba_int8, fetch_texel_2d_rgba_int8, fetch_texel_3d_rgba_int8, store_texel_rgba_int8 }, { MESA_FORMAT_RGBA_INT16, fetch_texel_1d_rgba_int16, fetch_texel_2d_rgba_int16, fetch_texel_3d_rgba_int16, store_texel_rgba_int16 }, { MESA_FORMAT_RGBA_INT32, fetch_texel_1d_rgba_int32, fetch_texel_2d_rgba_int32, fetch_texel_3d_rgba_int32, store_texel_rgba_int32 }, /* non-normalized, unsigned int */ { MESA_FORMAT_RGBA_UINT8, fetch_texel_1d_rgba_uint8, fetch_texel_2d_rgba_uint8, fetch_texel_3d_rgba_uint8, store_texel_rgba_uint8 }, { MESA_FORMAT_RGBA_UINT16, fetch_texel_1d_rgba_uint16, fetch_texel_2d_rgba_uint16, fetch_texel_3d_rgba_uint16, store_texel_rgba_uint16 }, { MESA_FORMAT_RGBA_UINT32, fetch_texel_1d_rgba_uint32, fetch_texel_2d_rgba_uint32, fetch_texel_3d_rgba_uint32, store_texel_rgba_uint32 }, /* dudv */ { MESA_FORMAT_DUDV8, fetch_texel_1d_dudv8, fetch_texel_2d_dudv8, fetch_texel_3d_dudv8, NULL }, /* signed, normalized */ { MESA_FORMAT_SIGNED_R8, fetch_texel_1d_signed_r8, fetch_texel_2d_signed_r8, fetch_texel_3d_signed_r8, store_texel_signed_r8 }, { MESA_FORMAT_SIGNED_RG88, fetch_texel_1d_signed_rg88, fetch_texel_2d_signed_rg88, fetch_texel_3d_signed_rg88, store_texel_signed_rg88 }, { MESA_FORMAT_SIGNED_RGBX8888, fetch_texel_1d_signed_rgbx8888, fetch_texel_2d_signed_rgbx8888, fetch_texel_3d_signed_rgbx8888, store_texel_signed_rgbx8888 }, { MESA_FORMAT_SIGNED_RGBA8888, fetch_texel_1d_signed_rgba8888, fetch_texel_2d_signed_rgba8888, fetch_texel_3d_signed_rgba8888, store_texel_signed_rgba8888 }, { MESA_FORMAT_SIGNED_RGBA8888_REV, fetch_texel_1d_signed_rgba8888_rev, fetch_texel_2d_signed_rgba8888_rev, fetch_texel_3d_signed_rgba8888_rev, store_texel_signed_rgba8888_rev }, { MESA_FORMAT_SIGNED_R_16, fetch_texel_1d_signed_r_16, fetch_texel_2d_signed_r_16, fetch_texel_3d_signed_r_16, store_texel_signed_r_16 }, { MESA_FORMAT_SIGNED_RG_16, fetch_texel_1d_signed_rg_16, fetch_texel_2d_signed_rg_16, fetch_texel_3d_signed_rg_16, store_texel_signed_rg_16 }, { MESA_FORMAT_SIGNED_RGB_16, fetch_texel_1d_signed_rgb_16, fetch_texel_2d_signed_rgb_16, fetch_texel_3d_signed_rgb_16, store_texel_signed_rgb_16 }, { MESA_FORMAT_SIGNED_RGBA_16, fetch_texel_1d_signed_rgba_16, fetch_texel_2d_signed_rgba_16, fetch_texel_3d_signed_rgba_16, store_texel_signed_rgba_16 }, { MESA_FORMAT_RGBA_16, fetch_texel_1d_rgba_16, fetch_texel_2d_rgba_16, fetch_texel_3d_rgba_16, store_texel_rgba_16 } }; static FetchTexelFuncF _mesa_get_texel_fetch_func(gl_format format, GLuint dims) { #ifdef DEBUG /* check that the table entries are sorted by format name */ gl_format fmt; for (fmt = 0; fmt < MESA_FORMAT_COUNT; fmt++) { assert(texfetch_funcs[fmt].Name == fmt); } #endif assert(Elements(texfetch_funcs) == MESA_FORMAT_COUNT); assert(format < MESA_FORMAT_COUNT); switch (dims) { case 1: return texfetch_funcs[format].Fetch1D; case 2: return texfetch_funcs[format].Fetch2D; case 3: return texfetch_funcs[format].Fetch3D; default: assert(0 && "bad dims in _mesa_get_texel_fetch_func"); return NULL; } } StoreTexelFunc _mesa_get_texel_store_func(gl_format format) { assert(format < MESA_FORMAT_COUNT); return texfetch_funcs[format].StoreTexel; } /** * Adaptor for fetching a GLchan texel from a float-valued texture. */ static void fetch_texel_float_to_chan(const struct gl_texture_image *texImage, GLint i, GLint j, GLint k, GLchan *texelOut) { GLfloat temp[4]; GLenum baseFormat = _mesa_get_format_base_format(texImage->TexFormat); ASSERT(texImage->FetchTexelf); texImage->FetchTexelf(texImage, i, j, k, temp); if (baseFormat == GL_DEPTH_COMPONENT || baseFormat == GL_DEPTH_STENCIL_EXT) { /* just one channel */ UNCLAMPED_FLOAT_TO_CHAN(texelOut[0], temp[0]); } else { /* four channels */ UNCLAMPED_FLOAT_TO_CHAN(texelOut[0], temp[0]); UNCLAMPED_FLOAT_TO_CHAN(texelOut[1], temp[1]); UNCLAMPED_FLOAT_TO_CHAN(texelOut[2], temp[2]); UNCLAMPED_FLOAT_TO_CHAN(texelOut[3], temp[3]); } } #if 0 /** * Adaptor for fetching a float texel from a GLchan-valued texture. */ static void fetch_texel_chan_to_float(const struct gl_texture_image *texImage, GLint i, GLint j, GLint k, GLfloat *texelOut) { GLchan temp[4]; GLenum baseFormat = _mesa_get_format_base_format(texImage->TexFormat); ASSERT(texImage->FetchTexelc); texImage->FetchTexelc(texImage, i, j, k, temp); if (baseFormat == GL_DEPTH_COMPONENT || baseFormat == GL_DEPTH_STENCIL_EXT) { /* just one channel */ texelOut[0] = CHAN_TO_FLOAT(temp[0]); } else { /* four channels */ texelOut[0] = CHAN_TO_FLOAT(temp[0]); texelOut[1] = CHAN_TO_FLOAT(temp[1]); texelOut[2] = CHAN_TO_FLOAT(temp[2]); texelOut[3] = CHAN_TO_FLOAT(temp[3]); } } #endif /** * Initialize the texture image's FetchTexelc and FetchTexelf methods. */ void _mesa_set_fetch_functions(struct gl_texture_image *texImage, GLuint dims) { ASSERT(dims == 1 || dims == 2 || dims == 3); texImage->FetchTexelf = _mesa_get_texel_fetch_func(texImage->TexFormat, dims); texImage->FetchTexelc = fetch_texel_float_to_chan; ASSERT(texImage->FetchTexelc); ASSERT(texImage->FetchTexelf); }