st_atom_sampler.c revision 5d5db24a26415cdec4b3d3f2a92bae7112c9f884 
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_format.h"
40#include "st_atom.h"
41#include "pipe/p_context.h"
42#include "pipe/p_defines.h"
43
44#include "cso_cache/cso_context.h"
45
46
47/**
48 * Convert GLenum texcoord wrap tokens to pipe tokens.
49 */
50static GLuint
51gl_wrap_xlate(GLenum wrap)
52{
53   switch (wrap) {
54   case GL_REPEAT:
55      return PIPE_TEX_WRAP_REPEAT;
56   case GL_CLAMP:
57      return PIPE_TEX_WRAP_CLAMP;
58   case GL_CLAMP_TO_EDGE:
59      return PIPE_TEX_WRAP_CLAMP_TO_EDGE;
60   case GL_CLAMP_TO_BORDER:
61      return PIPE_TEX_WRAP_CLAMP_TO_BORDER;
62   case GL_MIRRORED_REPEAT:
63      return PIPE_TEX_WRAP_MIRROR_REPEAT;
64   case GL_MIRROR_CLAMP_EXT:
65      return PIPE_TEX_WRAP_MIRROR_CLAMP;
66   case GL_MIRROR_CLAMP_TO_EDGE_EXT:
67      return PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE;
68   case GL_MIRROR_CLAMP_TO_BORDER_EXT:
69      return PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER;
70   default:
71      assert(0);
72      return 0;
73   }
74}
75
76
77static GLuint
78gl_filter_to_mip_filter(GLenum filter)
79{
80   switch (filter) {
81   case GL_NEAREST:
82   case GL_LINEAR:
83      return PIPE_TEX_MIPFILTER_NONE;
84
85   case GL_NEAREST_MIPMAP_NEAREST:
86   case GL_LINEAR_MIPMAP_NEAREST:
87      return PIPE_TEX_MIPFILTER_NEAREST;
88
89   case GL_NEAREST_MIPMAP_LINEAR:
90   case GL_LINEAR_MIPMAP_LINEAR:
91      return PIPE_TEX_MIPFILTER_LINEAR;
92
93   default:
94      assert(0);
95      return PIPE_TEX_MIPFILTER_NONE;
96   }
97}
98
99
100static GLuint
101gl_filter_to_img_filter(GLenum filter)
102{
103   switch (filter) {
104   case GL_NEAREST:
105   case GL_NEAREST_MIPMAP_NEAREST:
106   case GL_NEAREST_MIPMAP_LINEAR:
107      return PIPE_TEX_FILTER_NEAREST;
108
109   case GL_LINEAR:
110   case GL_LINEAR_MIPMAP_NEAREST:
111   case GL_LINEAR_MIPMAP_LINEAR:
112      return PIPE_TEX_FILTER_LINEAR;
113
114   default:
115      assert(0);
116      return PIPE_TEX_FILTER_NEAREST;
117   }
118}
119
120
121static void
122update_samplers(struct st_context *st)
123{
124   struct gl_vertex_program *vprog = st->ctx->VertexProgram._Current;
125   struct gl_fragment_program *fprog = st->ctx->FragmentProgram._Current;
126   const GLbitfield samplersUsed = (vprog->Base.SamplersUsed |
127                                    fprog->Base.SamplersUsed);
128   GLuint su;
129
130   st->state.num_samplers = 0;
131
132   /* loop over sampler units (aka tex image units) */
133   for (su = 0; su < st->ctx->Const.MaxTextureImageUnits; su++) {
134      struct pipe_sampler_state *sampler = st->state.samplers + su;
135
136      memset(sampler, 0, sizeof(*sampler));
137
138      if (samplersUsed & (1 << su)) {
139         struct gl_texture_object *texobj;
140         struct gl_texture_image *teximg;
141         GLuint texUnit;
142
143         if (fprog->Base.SamplersUsed & (1 << su))
144            texUnit = fprog->Base.SamplerUnits[su];
145         else
146            texUnit = vprog->Base.SamplerUnits[su];
147
148         texobj = st->ctx->Texture.Unit[texUnit]._Current;
149         if (!texobj) {
150            texobj = st_get_default_texture(st);
151         }
152
153         teximg = texobj->Image[0][texobj->BaseLevel];
154
155         sampler->wrap_s = gl_wrap_xlate(texobj->WrapS);
156         sampler->wrap_t = gl_wrap_xlate(texobj->WrapT);
157         sampler->wrap_r = gl_wrap_xlate(texobj->WrapR);
158
159         sampler->min_img_filter = gl_filter_to_img_filter(texobj->MinFilter);
160         sampler->min_mip_filter = gl_filter_to_mip_filter(texobj->MinFilter);
161         sampler->mag_img_filter = gl_filter_to_img_filter(texobj->MagFilter);
162
163         if (texobj->Target != GL_TEXTURE_RECTANGLE_ARB)
164            sampler->normalized_coords = 1;
165
166         sampler->lod_bias = st->ctx->Texture.Unit[texUnit].LodBias +
167            texobj->LodBias;
168
169         sampler->min_lod = texobj->BaseLevel + texobj->MinLod;
170         if (sampler->min_lod < texobj->BaseLevel)
171            sampler->min_lod = texobj->BaseLevel;
172
173         sampler->max_lod = MIN2((GLfloat) texobj->MaxLevel,
174                                 (texobj->MaxLod + texobj->BaseLevel));
175         if (sampler->max_lod < sampler->min_lod) {
176            /* The GL spec doesn't seem to specify what to do in this case.
177             * Swap the values.
178             */
179            float tmp = sampler->max_lod;
180            sampler->max_lod = sampler->min_lod;
181            sampler->min_lod = tmp;
182            assert(sampler->min_lod <= sampler->max_lod);
183         }
184
185         st_translate_color(texobj->BorderColor.f,
186                            teximg ? teximg->_BaseFormat : GL_RGBA,
187                            sampler->border_color);
188
189	 sampler->max_anisotropy = (texobj->MaxAnisotropy == 1.0 ? 0 : (GLuint)texobj->MaxAnisotropy);
190
191         /* only care about ARB_shadow, not SGI shadow */
192         if (texobj->CompareMode == GL_COMPARE_R_TO_TEXTURE) {
193            sampler->compare_mode = PIPE_TEX_COMPARE_R_TO_TEXTURE;
194            sampler->compare_func
195               = st_compare_func_to_pipe(texobj->CompareFunc);
196         }
197
198         st->state.num_samplers = su + 1;
199
200         /*printf("%s su=%u non-null\n", __FUNCTION__, su);*/
201         cso_single_sampler(st->cso_context, su, sampler);
202         if (su < st->ctx->Const.MaxVertexTextureImageUnits) {
203            cso_single_vertex_sampler(st->cso_context, su, sampler);
204         }
205      }
206      else {
207         /*printf("%s su=%u null\n", __FUNCTION__, su);*/
208         cso_single_sampler(st->cso_context, su, NULL);
209         if (su < st->ctx->Const.MaxVertexTextureImageUnits) {
210            cso_single_vertex_sampler(st->cso_context, su, NULL);
211         }
212      }
213   }
214
215   cso_single_sampler_done(st->cso_context);
216   if (st->ctx->Const.MaxVertexTextureImageUnits > 0) {
217      cso_single_vertex_sampler_done(st->cso_context);
218   }
219}
220
221
222const struct st_tracked_state st_update_sampler = {
223   "st_update_sampler",					/* name */
224   {							/* dirty */
225      _NEW_TEXTURE,					/* mesa */
226      0,						/* st */
227   },
228   update_samplers					/* update */
229};
230