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
  37 #include "st_context.h"
  38 #include "st_cb_texture.h"
  39 #include "st_atom.h"
  40 #include "pipe/p_context.h"
  41 #include "pipe/p_defines.h"
  42
  43 #include "cso_cache/cso_context.h"
  44
  45
  46 /**
  47  * Convert GLenum texcoord wrap tokens to pipe tokens.
  48  */
  49 static GLuint
  50 gl_wrap_xlate(GLenum wrap)
  51 {
  52    switch (wrap) {
  53    case GL_REPEAT:
  54       return PIPE_TEX_WRAP_REPEAT;
  55    case GL_CLAMP:
  56       return PIPE_TEX_WRAP_CLAMP;
  57    case GL_CLAMP_TO_EDGE:
  58       return PIPE_TEX_WRAP_CLAMP_TO_EDGE;
  59    case GL_CLAMP_TO_BORDER:
  60       return PIPE_TEX_WRAP_CLAMP_TO_BORDER;
  61    case GL_MIRRORED_REPEAT:
  62       return PIPE_TEX_WRAP_MIRROR_REPEAT;
  63    case GL_MIRROR_CLAMP_EXT:
  64       return PIPE_TEX_WRAP_MIRROR_CLAMP;
  65    case GL_MIRROR_CLAMP_TO_EDGE_EXT:
  66       return PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE;
  67    case GL_MIRROR_CLAMP_TO_BORDER_EXT:
  68       return PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER;
  69    default:
  70       assert(0);
  71       return 0;
  72    }
  73 }
  74
  75
  76 static GLuint
  77 gl_filter_to_mip_filter(GLenum filter)
  78 {
  79    switch (filter) {
  80    case GL_NEAREST:
  81    case GL_LINEAR:
  82       return PIPE_TEX_MIPFILTER_NONE;
  83
  84    case GL_NEAREST_MIPMAP_NEAREST:
  85    case GL_LINEAR_MIPMAP_NEAREST:
  86       return PIPE_TEX_MIPFILTER_NEAREST;
  87
  88    case GL_NEAREST_MIPMAP_LINEAR:
  89    case GL_LINEAR_MIPMAP_LINEAR:
  90       return PIPE_TEX_MIPFILTER_LINEAR;
  91
  92    default:
  93       assert(0);
  94       return PIPE_TEX_MIPFILTER_NONE;
  95    }
  96 }
  97
  98
  99 static GLuint
 100 gl_filter_to_img_filter(GLenum filter)
 101 {
 102    switch (filter) {
 103    case GL_NEAREST:
 104    case GL_NEAREST_MIPMAP_NEAREST:
 105    case GL_NEAREST_MIPMAP_LINEAR:
 106       return PIPE_TEX_FILTER_NEAREST;
 107
 108    case GL_LINEAR:
 109    case GL_LINEAR_MIPMAP_NEAREST:
 110    case GL_LINEAR_MIPMAP_LINEAR:
 111       return PIPE_TEX_FILTER_LINEAR;
 112
 113    default:
 114       assert(0);
 115       return PIPE_TEX_FILTER_NEAREST;
 116    }
 117 }
 118
 119
 120 static void
 121 xlate_border_color(const GLfloat *colorIn, GLenum baseFormat, GLfloat *colorOut)
 122 {
 123    switch (baseFormat) {
 124    case GL_RGB:
 125       colorOut[0] = colorIn[0];
 126       colorOut[1] = colorIn[1];
 127       colorOut[2] = colorIn[2];
 128       colorOut[3] = 1.0F;
 129       break;
 130    case GL_ALPHA:
 131       colorOut[0] = colorOut[1] = colorOut[2] = 0.0;
 132       colorOut[3] = colorIn[3];
 133       break;
 134    case GL_LUMINANCE:
 135       colorOut[0] = colorOut[1] = colorOut[2] = colorIn[0];
 136       colorOut[3] = 1.0;
 137       break;
 138    case GL_LUMINANCE_ALPHA:
 139       colorOut[0] = colorOut[1] = colorOut[2] = colorIn[0];
 140       colorOut[3] = colorIn[3];
 141       break;
 142    case GL_INTENSITY:
 143       colorOut[0] = colorOut[1] = colorOut[2] = colorOut[3] = colorIn[0];
 144       break;
 145    default:
 146       COPY_4V(colorOut, colorIn);
 147    }
 148 }
 149
 150
 151 static void
 152 update_samplers(struct st_context *st)
 153 {
 154    struct gl_vertex_program *vprog = st->ctx->VertexProgram._Current;
 155    struct gl_fragment_program *fprog = st->ctx->FragmentProgram._Current;
 156    const GLbitfield samplersUsed = (vprog->Base.SamplersUsed |
 157                                     fprog->Base.SamplersUsed);
 158    GLuint su;
 159
 160    st->state.num_samplers = 0;
 161
 162    /* loop over sampler units (aka tex image units) */
 163    for (su = 0; su < st->ctx->Const.MaxTextureImageUnits; su++) {
 164       struct pipe_sampler_state *sampler = st->state.samplers + su;
 165
 166       memset(sampler, 0, sizeof(*sampler));
 167
 168       if (samplersUsed & (1 << su)) {
 169          struct gl_texture_object *texobj;
 170          struct gl_texture_image *teximg;
 171          GLuint texUnit;
 172
 173          if (fprog->Base.SamplersUsed & (1 << su))
 174             texUnit = fprog->Base.SamplerUnits[su];
 175          else
 176             texUnit = vprog->Base.SamplerUnits[su];
 177
 178          texobj = st->ctx->Texture.Unit[texUnit]._Current;
 179          if (!texobj) {
 180             texobj = st_get_default_texture(st);
 181          }
 182
 183          teximg = texobj->Image[0][texobj->BaseLevel];
 184
 185          sampler->wrap_s = gl_wrap_xlate(texobj->WrapS);
 186          sampler->wrap_t = gl_wrap_xlate(texobj->WrapT);
 187          sampler->wrap_r = gl_wrap_xlate(texobj->WrapR);
 188
 189          sampler->min_img_filter = gl_filter_to_img_filter(texobj->MinFilter);
 190          sampler->min_mip_filter = gl_filter_to_mip_filter(texobj->MinFilter);
 191          sampler->mag_img_filter = gl_filter_to_img_filter(texobj->MagFilter);
 192
 193          if (texobj->Target != GL_TEXTURE_RECTANGLE_ARB)
 194             sampler->normalized_coords = 1;
 195
 196          sampler->lod_bias = st->ctx->Texture.Unit[su].LodBias;
 197          sampler->min_lod = MAX2(0.0f, texobj->MinLod);
 198          sampler->max_lod = MIN2(texobj->MaxLevel - texobj->BaseLevel,
 199                                  texobj->MaxLod);
 200          if (sampler->max_lod < sampler->min_lod) {
 201             /* The GL spec doesn't seem to specify what to do in this case.
 202              * Swap the values.
 203              */
 204             float tmp = sampler->max_lod;
 205             sampler->max_lod = sampler->min_lod;
 206             sampler->min_lod = tmp;
 207             assert(sampler->min_lod <= sampler->max_lod);
 208          }
 209
 210          xlate_border_color(texobj->BorderColor.f,
 211                             teximg ? teximg->_BaseFormat : GL_RGBA,
 212                             sampler->border_color);
 213
 214          sampler->max_anisotropy = (texobj->MaxAnisotropy == 1.0 ? 0 : (GLuint)texobj->MaxAnisotropy);
 215
 216          /* only care about ARB_shadow, not SGI shadow */
 217          if (texobj->CompareMode == GL_COMPARE_R_TO_TEXTURE) {
 218             sampler->compare_mode = PIPE_TEX_COMPARE_R_TO_TEXTURE;
 219             sampler->compare_func
 220                = st_compare_func_to_pipe(texobj->CompareFunc);
 221          }
 222
 223          st->state.num_samplers = su + 1;
 224
 225          /*printf("%s su=%u non-null\n", __FUNCTION__, su);*/
 226          cso_single_sampler(st->cso_context, su, sampler);
 227          if (su < st->ctx->Const.MaxVertexTextureImageUnits) {
 228             cso_single_vertex_sampler(st->cso_context, su, sampler);
 229          }
 230       }
 231       else {
 232          /*printf("%s su=%u null\n", __FUNCTION__, su);*/
 233          cso_single_sampler(st->cso_context, su, NULL);
 234          if (su < st->ctx->Const.MaxVertexTextureImageUnits) {
 235             cso_single_vertex_sampler(st->cso_context, su, NULL);
 236          }
 237       }
 238    }
 239
 240    cso_single_sampler_done(st->cso_context);
 241    if (st->ctx->Const.MaxVertexTextureImageUnits > 0) {
 242       cso_single_vertex_sampler_done(st->cso_context);
 243    }
 244 }
 245
 246
 247 const struct st_tracked_state st_update_sampler = {
 248    "st_update_sampler",                                 /* name */
 249    {                                                    /* dirty */
 250       _NEW_TEXTURE,                                     /* mesa */
 251       0,                                                /* st */
 252    },
 253    update_samplers                                      /* update */
 254 };