/* * 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 "context.h" #include "texcompress.h" #include "texcompress_fxt1.h" #include "texcompress_s3tc.h" #include "texfetch.h" #if FEATURE_EXT_texture_sRGB /** * 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) _mesa_pow((cs + 0.055) / 1.055, 2.4); } } tableReady = GL_TRUE; } return table[cs8]; } #endif /* FEATURE_EXT_texture_sRGB */ /* 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 { GLuint Name; FetchTexelFuncF Fetch1D; FetchTexelFuncF Fetch2D; FetchTexelFuncF Fetch3D; StoreTexelFunc StoreTexel; } texfetch_funcs[MESA_FORMAT_COUNT] = { { 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_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_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_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 }, { MESA_FORMAT_DUDV8, fetch_texel_1d_dudv8, fetch_texel_2d_dudv8, fetch_texel_3d_dudv8, NULL }, { 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_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_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_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_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_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_Z32, fetch_texel_1d_f_z32, fetch_texel_2d_f_z32, fetch_texel_3d_f_z32, store_texel_z32 } }; FetchTexelFuncF _mesa_get_texel_fetch_func(gl_format format, GLuint dims) { FetchTexelFuncF f; GLuint i; /* XXX replace loop with direct table lookup */ for (i = 0; i < MESA_FORMAT_COUNT; i++) { if (texfetch_funcs[i].Name == format) { switch (dims) { case 1: f = texfetch_funcs[i].Fetch1D; break; case 2: f = texfetch_funcs[i].Fetch2D; break; case 3: f = texfetch_funcs[i].Fetch3D; break; } if (!f) f = fetch_null_texelf; return f; } } return NULL; } StoreTexelFunc _mesa_get_texel_store_func(gl_format format) { GLuint i; /* XXX replace loop with direct table lookup */ for (i = 0; i < MESA_FORMAT_COUNT; i++) { if (texfetch_funcs[i].Name == format) { if (texfetch_funcs[i].StoreTexel) return texfetch_funcs[i].StoreTexel; else return store_null_texel; } } return NULL; } /** * 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]); } } /** * 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]); } } /** * 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); ASSERT(texImage->TexFormat); texImage->FetchTexelf = _mesa_get_texel_fetch_func(texImage->TexFormat, dims); /* now check if we need to use a float/chan adaptor */ if (!texImage->FetchTexelc) { texImage->FetchTexelc = fetch_texel_float_to_chan; } else if (!texImage->FetchTexelf) { texImage->FetchTexelf = fetch_texel_chan_to_float; } ASSERT(texImage->FetchTexelc); ASSERT(texImage->FetchTexelf); }