src/mesa/state_tracker/st_atom_sampler.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28  /*
  29   * Authors:
  30   *   Keith Whitwell <keith@tungstengraphics.com>
  31   *   Brian Paul
  32   */
  33
  34
  35 #include "main/macros.h"
  36 #include "main/mtypes.h"
  37 #include "main/glformats.h"
  38 #include "main/samplerobj.h"
  39 #include "main/texobj.h"
  40
  41 #include "st_context.h"
  42 #include "st_cb_texture.h"
  43 #include "st_format.h"
  44 #include "st_atom.h"
  45 #include "st_texture.h"
  46 #include "pipe/p_context.h"
  47 #include "pipe/p_defines.h"
  48
  49 #include "cso_cache/cso_context.h"
  50
  51 #include "util/u_format.h"
  52
  53
  54 /**
  55  * Convert GLenum texcoord wrap tokens to pipe tokens.
  56  */
  57 static GLuint
  58 gl_wrap_xlate(GLenum wrap)
  59 {
  60    switch (wrap) {
  61    case GL_REPEAT:
  62       return PIPE_TEX_WRAP_REPEAT;
  63    case GL_CLAMP:
  64       return PIPE_TEX_WRAP_CLAMP;
  65    case GL_CLAMP_TO_EDGE:
  66       return PIPE_TEX_WRAP_CLAMP_TO_EDGE;
  67    case GL_CLAMP_TO_BORDER:
  68       return PIPE_TEX_WRAP_CLAMP_TO_BORDER;
  69    case GL_MIRRORED_REPEAT:
  70       return PIPE_TEX_WRAP_MIRROR_REPEAT;
  71    case GL_MIRROR_CLAMP_EXT:
  72       return PIPE_TEX_WRAP_MIRROR_CLAMP;
  73    case GL_MIRROR_CLAMP_TO_EDGE_EXT:
  74       return PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE;
  75    case GL_MIRROR_CLAMP_TO_BORDER_EXT:
  76       return PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER;
  77    default:
  78       assert(0);
  79       return 0;
  80    }
  81 }
  82
  83
  84 static GLuint
  85 gl_filter_to_mip_filter(GLenum filter)
  86 {
  87    switch (filter) {
  88    case GL_NEAREST:
  89    case GL_LINEAR:
  90       return PIPE_TEX_MIPFILTER_NONE;
  91
  92    case GL_NEAREST_MIPMAP_NEAREST:
  93    case GL_LINEAR_MIPMAP_NEAREST:
  94       return PIPE_TEX_MIPFILTER_NEAREST;
  95
  96    case GL_NEAREST_MIPMAP_LINEAR:
  97    case GL_LINEAR_MIPMAP_LINEAR:
  98       return PIPE_TEX_MIPFILTER_LINEAR;
  99
 100    default:
 101       assert(0);
 102       return PIPE_TEX_MIPFILTER_NONE;
 103    }
 104 }
 105
 106
 107 static GLuint
 108 gl_filter_to_img_filter(GLenum filter)
 109 {
 110    switch (filter) {
 111    case GL_NEAREST:
 112    case GL_NEAREST_MIPMAP_NEAREST:
 113    case GL_NEAREST_MIPMAP_LINEAR:
 114       return PIPE_TEX_FILTER_NEAREST;
 115
 116    case GL_LINEAR:
 117    case GL_LINEAR_MIPMAP_NEAREST:
 118    case GL_LINEAR_MIPMAP_LINEAR:
 119       return PIPE_TEX_FILTER_LINEAR;
 120
 121    default:
 122       assert(0);
 123       return PIPE_TEX_FILTER_NEAREST;
 124    }
 125 }
 126
 127
 128 static void
 129 convert_sampler(struct st_context *st,
 130                 struct pipe_sampler_state *sampler,
 131                 GLuint texUnit)
 132 {
 133    struct gl_texture_object *texobj;
 134    struct gl_context *ctx = st->ctx;
 135    struct gl_sampler_object *msamp;
 136
 137    texobj = ctx->Texture.Unit[texUnit]._Current;
 138    if (!texobj) {
 139       texobj = _mesa_get_fallback_texture(ctx, TEXTURE_2D_INDEX);
 140    }
 141
 142    msamp = _mesa_get_samplerobj(ctx, texUnit);
 143
 144    memset(sampler, 0, sizeof(*sampler));
 145    sampler->wrap_s = gl_wrap_xlate(msamp->WrapS);
 146    sampler->wrap_t = gl_wrap_xlate(msamp->WrapT);
 147    sampler->wrap_r = gl_wrap_xlate(msamp->WrapR);
 148
 149    sampler->min_img_filter = gl_filter_to_img_filter(msamp->MinFilter);
 150    sampler->min_mip_filter = gl_filter_to_mip_filter(msamp->MinFilter);
 151    sampler->mag_img_filter = gl_filter_to_img_filter(msamp->MagFilter);
 152
 153    if (texobj->Target != GL_TEXTURE_RECTANGLE_ARB)
 154       sampler->normalized_coords = 1;
 155
 156    sampler->lod_bias = ctx->Texture.Unit[texUnit].LodBias + msamp->LodBias;
 157
 158    sampler->min_lod = CLAMP(msamp->MinLod,
 159                             0.0f,
 160                             (GLfloat) texobj->MaxLevel - texobj->BaseLevel);
 161    sampler->max_lod = MIN2((GLfloat) texobj->MaxLevel - texobj->BaseLevel,
 162                            msamp->MaxLod);
 163    if (sampler->max_lod < sampler->min_lod) {
 164       /* The GL spec doesn't seem to specify what to do in this case.
 165        * Swap the values.
 166        */
 167       float tmp = sampler->max_lod;
 168       sampler->max_lod = sampler->min_lod;
 169       sampler->min_lod = tmp;
 170       assert(sampler->min_lod <= sampler->max_lod);
 171    }
 172
 173    /* For non-black borders... */
 174    if (msamp->BorderColor.ui[0] ||
 175        msamp->BorderColor.ui[1] ||
 176        msamp->BorderColor.ui[2] ||
 177        msamp->BorderColor.ui[3]) {
 178       struct st_texture_object *stobj = st_texture_object(texobj);
 179       struct gl_texture_image *teximg;
 180       const GLboolean is_integer = texobj->_IsIntegerFormat;
 181       union pipe_color_union border_color;
 182
 183       teximg = texobj->Image[0][texobj->BaseLevel];
 184
 185       if (st->apply_texture_swizzle_to_border_color && stobj->sampler_view) {
 186          const unsigned char swz[4] =
 187          {
 188             stobj->sampler_view->swizzle_r,
 189             stobj->sampler_view->swizzle_g,
 190             stobj->sampler_view->swizzle_b,
 191             stobj->sampler_view->swizzle_a,
 192          };
 193
 194          st_translate_color(&msamp->BorderColor,
 195                             &border_color,
 196                             teximg ? teximg->_BaseFormat : GL_RGBA, is_integer);
 197
 198          util_format_apply_color_swizzle(&sampler->border_color,
 199                                          &border_color, swz, is_integer);
 200       } else {
 201          st_translate_color(&msamp->BorderColor,
 202                             &sampler->border_color,
 203                             teximg ? teximg->_BaseFormat : GL_RGBA, is_integer);
 204       }
 205    }
 206
 207    sampler->max_anisotropy = (msamp->MaxAnisotropy == 1.0 ?
 208                               0 : (GLuint) msamp->MaxAnisotropy);
 209
 210    /* only care about ARB_shadow, not SGI shadow */
 211    if (msamp->CompareMode == GL_COMPARE_R_TO_TEXTURE) {
 212       sampler->compare_mode = PIPE_TEX_COMPARE_R_TO_TEXTURE;
 213       sampler->compare_func
 214          = st_compare_func_to_pipe(msamp->CompareFunc);
 215    }
 216
 217    sampler->seamless_cube_map =
 218       ctx->Texture.CubeMapSeamless || msamp->CubeMapSeamless;
 219 }
 220
 221
 222 /**
 223  * Update the gallium driver's sampler state for fragment, vertex or
 224  * geometry shader stage.
 225  */
 226 static void
 227 update_shader_samplers(struct st_context *st,
 228                        unsigned shader_stage,
 229                        const struct gl_program *prog,
 230                        unsigned max_units,
 231                        struct pipe_sampler_state *samplers,
 232                        unsigned *num_samplers)
 233 {
 234    GLuint unit;
 235    GLbitfield samplers_used;
 236    const GLuint old_max = *num_samplers;
 237
 238    samplers_used = prog->SamplersUsed;
 239
 240    if (*num_samplers == 0 && samplers_used == 0x0)
 241        return;
 242
 243    *num_samplers = 0;
 244
 245    /* loop over sampler units (aka tex image units) */
 246    for (unit = 0; unit < max_units; unit++, samplers_used >>= 1) {
 247       struct pipe_sampler_state *sampler = samplers + unit;
 248
 249       if (samplers_used & 1) {
 250          const GLuint texUnit = prog->SamplerUnits[unit];
 251
 252          convert_sampler(st, sampler, texUnit);
 253
 254          *num_samplers = unit + 1;
 255
 256          cso_single_sampler(st->cso_context, shader_stage, unit, sampler);
 257       }
 258       else if (samplers_used != 0 || unit < old_max) {
 259          cso_single_sampler(st->cso_context, shader_stage, unit, NULL);
 260       }
 261       else {
 262          /* if we've reset all the old samplers and we have no more new ones */
 263          break;
 264       }
 265    }
 266
 267    cso_single_sampler_done(st->cso_context, shader_stage);
 268 }
 269
 270
 271 static void
 272 update_samplers(struct st_context *st)
 273 {
 274    const struct gl_context *ctx = st->ctx;
 275
 276    update_shader_samplers(st,
 277                           PIPE_SHADER_FRAGMENT,
 278                           &ctx->FragmentProgram._Current->Base,
 279                           ctx->Const.FragmentProgram.MaxTextureImageUnits,
 280                           st->state.samplers[PIPE_SHADER_FRAGMENT],
 281                           &st->state.num_samplers[PIPE_SHADER_FRAGMENT]);
 282
 283    update_shader_samplers(st,
 284                           PIPE_SHADER_VERTEX,
 285                           &ctx->VertexProgram._Current->Base,
 286                           ctx->Const.VertexProgram.MaxTextureImageUnits,
 287                           st->state.samplers[PIPE_SHADER_VERTEX],
 288                           &st->state.num_samplers[PIPE_SHADER_VERTEX]);
 289
 290    if (ctx->GeometryProgram._Current) {
 291       update_shader_samplers(st,
 292                              PIPE_SHADER_GEOMETRY,
 293                              &ctx->GeometryProgram._Current->Base,
 294                              ctx->Const.GeometryProgram.MaxTextureImageUnits,
 295                              st->state.samplers[PIPE_SHADER_GEOMETRY],
 296                              &st->state.num_samplers[PIPE_SHADER_GEOMETRY]);
 297    }
 298 }
 299
 300
 301 const struct st_tracked_state st_update_sampler = {
 302    "st_update_sampler",                                 /* name */
 303    {                                                    /* dirty */
 304       _NEW_TEXTURE,                                     /* mesa */
 305       0,                                                /* st */
 306    },
 307    update_samplers                                      /* update */
 308 };