src/mesa/state_tracker/st_atom_sampler.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
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  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.
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  26  **************************************************************************/
  27
  28  /*
  29   * Authors:
  30   *   Keith Whitwell <keithw@vmware.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    const struct gl_texture_object *texobj;
 134    struct gl_context *ctx = st->ctx;
 135    struct gl_sampler_object *msamp;
 136    const struct gl_texture_image *teximg;
 137    GLenum texBaseFormat;
 138
 139    texobj = ctx->Texture.Unit[texUnit]._Current;
 140    if (!texobj) {
 141       texobj = _mesa_get_fallback_texture(ctx, TEXTURE_2D_INDEX);
 142    }
 143
 144    teximg = texobj->Image[0][texobj->BaseLevel];
 145    texBaseFormat = teximg ? teximg->_BaseFormat : GL_RGBA;
 146
 147    msamp = _mesa_get_samplerobj(ctx, texUnit);
 148
 149    memset(sampler, 0, sizeof(*sampler));
 150    sampler->wrap_s = gl_wrap_xlate(msamp->WrapS);
 151    sampler->wrap_t = gl_wrap_xlate(msamp->WrapT);
 152    sampler->wrap_r = gl_wrap_xlate(msamp->WrapR);
 153
 154    sampler->min_img_filter = gl_filter_to_img_filter(msamp->MinFilter);
 155    sampler->min_mip_filter = gl_filter_to_mip_filter(msamp->MinFilter);
 156    sampler->mag_img_filter = gl_filter_to_img_filter(msamp->MagFilter);
 157
 158    if (texobj->Target != GL_TEXTURE_RECTANGLE_ARB)
 159       sampler->normalized_coords = 1;
 160
 161    sampler->lod_bias = ctx->Texture.Unit[texUnit].LodBias + msamp->LodBias;
 162
 163    sampler->min_lod = CLAMP(msamp->MinLod,
 164                             0.0f,
 165                             (GLfloat) texobj->MaxLevel - texobj->BaseLevel);
 166    sampler->max_lod = MIN2((GLfloat) texobj->MaxLevel - texobj->BaseLevel,
 167                            msamp->MaxLod);
 168    if (sampler->max_lod < sampler->min_lod) {
 169       /* The GL spec doesn't seem to specify what to do in this case.
 170        * Swap the values.
 171        */
 172       float tmp = sampler->max_lod;
 173       sampler->max_lod = sampler->min_lod;
 174       sampler->min_lod = tmp;
 175       assert(sampler->min_lod <= sampler->max_lod);
 176    }
 177
 178    /* For non-black borders... */
 179    if (msamp->BorderColor.ui[0] ||
 180        msamp->BorderColor.ui[1] ||
 181        msamp->BorderColor.ui[2] ||
 182        msamp->BorderColor.ui[3]) {
 183       const struct st_texture_object *stobj = st_texture_object_const(texobj);
 184       const GLboolean is_integer = texobj->_IsIntegerFormat;
 185       union pipe_color_union border_color;
 186
 187       if (st->apply_texture_swizzle_to_border_color && stobj->sampler_view) {
 188          const unsigned char swz[4] =
 189          {
 190             stobj->sampler_view->swizzle_r,
 191             stobj->sampler_view->swizzle_g,
 192             stobj->sampler_view->swizzle_b,
 193             stobj->sampler_view->swizzle_a,
 194          };
 195
 196          st_translate_color(&msamp->BorderColor,
 197                             &border_color,
 198                             texBaseFormat, is_integer);
 199
 200          util_format_apply_color_swizzle(&sampler->border_color,
 201                                          &border_color, swz, is_integer);
 202       } else {
 203          st_translate_color(&msamp->BorderColor,
 204                             &sampler->border_color,
 205                             texBaseFormat, is_integer);
 206       }
 207    }
 208
 209    sampler->max_anisotropy = (msamp->MaxAnisotropy == 1.0 ?
 210                               0 : (GLuint) msamp->MaxAnisotropy);
 211
 212    /* If sampling a depth texture and using shadow comparison */
 213    if ((texBaseFormat == GL_DEPTH_COMPONENT ||
 214         texBaseFormat == GL_DEPTH_STENCIL) &&
 215        msamp->CompareMode == GL_COMPARE_R_TO_TEXTURE) {
 216       sampler->compare_mode = PIPE_TEX_COMPARE_R_TO_TEXTURE;
 217       sampler->compare_func = st_compare_func_to_pipe(msamp->CompareFunc);
 218    }
 219
 220    sampler->seamless_cube_map =
 221       ctx->Texture.CubeMapSeamless || msamp->CubeMapSeamless;
 222 }
 223
 224
 225 /**
 226  * Update the gallium driver's sampler state for fragment, vertex or
 227  * geometry shader stage.
 228  */
 229 static void
 230 update_shader_samplers(struct st_context *st,
 231                        unsigned shader_stage,
 232                        const struct gl_program *prog,
 233                        unsigned max_units,
 234                        struct pipe_sampler_state *samplers,
 235                        unsigned *num_samplers)
 236 {
 237    GLuint unit;
 238    GLbitfield samplers_used;
 239    const GLuint old_max = *num_samplers;
 240
 241    samplers_used = prog->SamplersUsed;
 242
 243    if (*num_samplers == 0 && samplers_used == 0x0)
 244        return;
 245
 246    *num_samplers = 0;
 247
 248    /* loop over sampler units (aka tex image units) */
 249    for (unit = 0; unit < max_units; unit++, samplers_used >>= 1) {
 250       struct pipe_sampler_state *sampler = samplers + unit;
 251
 252       if (samplers_used & 1) {
 253          const GLuint texUnit = prog->SamplerUnits[unit];
 254
 255          convert_sampler(st, sampler, texUnit);
 256
 257          *num_samplers = unit + 1;
 258
 259          cso_single_sampler(st->cso_context, shader_stage, unit, sampler);
 260       }
 261       else if (samplers_used != 0 || unit < old_max) {
 262          cso_single_sampler(st->cso_context, shader_stage, unit, NULL);
 263       }
 264       else {
 265          /* if we've reset all the old samplers and we have no more new ones */
 266          break;
 267       }
 268    }
 269
 270    cso_single_sampler_done(st->cso_context, shader_stage);
 271 }
 272
 273
 274 static void
 275 update_samplers(struct st_context *st)
 276 {
 277    const struct gl_context *ctx = st->ctx;
 278
 279    update_shader_samplers(st,
 280                           PIPE_SHADER_FRAGMENT,
 281                           &ctx->FragmentProgram._Current->Base,
 282                           ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits,
 283                           st->state.samplers[PIPE_SHADER_FRAGMENT],
 284                           &st->state.num_samplers[PIPE_SHADER_FRAGMENT]);
 285
 286    update_shader_samplers(st,
 287                           PIPE_SHADER_VERTEX,
 288                           &ctx->VertexProgram._Current->Base,
 289                           ctx->Const.Program[MESA_SHADER_VERTEX].MaxTextureImageUnits,
 290                           st->state.samplers[PIPE_SHADER_VERTEX],
 291                           &st->state.num_samplers[PIPE_SHADER_VERTEX]);
 292
 293    if (ctx->GeometryProgram._Current) {
 294       update_shader_samplers(st,
 295                              PIPE_SHADER_GEOMETRY,
 296                              &ctx->GeometryProgram._Current->Base,
 297                              ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxTextureImageUnits,
 298                              st->state.samplers[PIPE_SHADER_GEOMETRY],
 299                              &st->state.num_samplers[PIPE_SHADER_GEOMETRY]);
 300    }
 301 }
 302
 303
 304 const struct st_tracked_state st_update_sampler = {
 305    "st_update_sampler",                                 /* name */
 306    {                                                    /* dirty */
 307       _NEW_TEXTURE,                                     /* mesa */
 308       0,                                                /* st */
 309    },
 310    update_samplers                                      /* update */
 311 };