st_atom_sampler.c revision 8f6d9e12be0be086ca2aab0b56dff8d2181addd9 
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 "st_program.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_to_sp(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   const struct st_fragment_program *fs = st->fp;
125   GLuint su;
126
127   st->state.num_samplers = 0;
128
129   /*printf("%s samplers used = 0x%x\n", __FUNCTION__, fs->Base.Base.SamplersUsed);*/
130
131   /* loop over sampler units (aka tex image units) */
132   for (su = 0; su < st->ctx->Const.MaxTextureImageUnits; su++) {
133      struct pipe_sampler_state *sampler = st->state.samplers + su;
134
135      memset(sampler, 0, sizeof(*sampler));
136
137      if (fs->Base.Base.SamplersUsed & (1 << su)) {
138         GLuint texUnit = fs->Base.Base.SamplerUnits[su];
139         const struct gl_texture_object *texobj
140            = st->ctx->Texture.Unit[texUnit]._Current;
141
142         if (!texobj) {
143            texobj = st_get_default_texture(st);
144         }
145
146         sampler->wrap_s = gl_wrap_to_sp(texobj->WrapS);
147         sampler->wrap_t = gl_wrap_to_sp(texobj->WrapT);
148         sampler->wrap_r = gl_wrap_to_sp(texobj->WrapR);
149
150         sampler->min_img_filter = gl_filter_to_img_filter(texobj->MinFilter);
151         sampler->min_mip_filter = gl_filter_to_mip_filter(texobj->MinFilter);
152         sampler->mag_img_filter = gl_filter_to_img_filter(texobj->MagFilter);
153
154         if (texobj->Target != GL_TEXTURE_RECTANGLE_ARB)
155            sampler->normalized_coords = 1;
156
157         sampler->lod_bias = st->ctx->Texture.Unit[su].LodBias;
158         sampler->min_lod = MAX2(0.0f, texobj->MinLod);
159         sampler->max_lod = MIN2(texobj->MaxLevel - texobj->BaseLevel,
160                                 texobj->MaxLod);
161         if (sampler->max_lod < sampler->min_lod) {
162            /* The GL spec doesn't seem to specify what to do in this case.
163             * Swap the values.
164             */
165            float tmp = sampler->max_lod;
166            sampler->max_lod = sampler->min_lod;
167            sampler->min_lod = tmp;
168            assert(sampler->min_lod <= sampler->max_lod);
169         }
170
171         sampler->border_color[0] = texobj->BorderColor[RCOMP];
172         sampler->border_color[1] = texobj->BorderColor[GCOMP];
173         sampler->border_color[2] = texobj->BorderColor[BCOMP];
174         sampler->border_color[3] = texobj->BorderColor[ACOMP];
175
176	 sampler->max_anisotropy = texobj->MaxAnisotropy;
177         if (sampler->max_anisotropy > 1.0) {
178            sampler->min_img_filter = PIPE_TEX_FILTER_ANISO;
179            sampler->mag_img_filter = PIPE_TEX_FILTER_ANISO;
180         }
181
182         /* only care about ARB_shadow, not SGI shadow */
183         if (texobj->CompareMode == GL_COMPARE_R_TO_TEXTURE) {
184            sampler->compare_mode = PIPE_TEX_COMPARE_R_TO_TEXTURE;
185            sampler->compare_func
186               = st_compare_func_to_pipe(texobj->CompareFunc);
187         }
188
189         st->state.num_samplers = su + 1;
190
191         /*printf("%s su=%u non-null\n", __FUNCTION__, su);*/
192         cso_single_sampler(st->cso_context, su, sampler);
193      }
194      else {
195         /*printf("%s su=%u null\n", __FUNCTION__, su);*/
196         cso_single_sampler(st->cso_context, su, NULL);
197      }
198   }
199
200   cso_single_sampler_done(st->cso_context);
201}
202
203
204const struct st_tracked_state st_update_sampler = {
205   "st_update_sampler",					/* name */
206   {							/* dirty */
207      _NEW_TEXTURE,					/* mesa */
208      0,						/* st */
209   },
210   update_samplers					/* update */
211};
212