1 /*
2 * Mesa 3-D graphics library
3 *
4 * Copyright (C) 1999-2007 Brian Paul 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 "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 *
24 * Authors:
25 * Keith Whitwell <keithw@vmware.com>
26 */
27
28 #include "main/glheader.h"
29 #include "main/context.h"
30
31 #include "main/mtypes.h"
32
33 #include "t_context.h"
34 #include "t_pipeline.h"
35 #include "t_vp_build.h"
36 #include "t_vertex.h"
37
_tnl_install_pipeline(struct gl_context * ctx,const struct tnl_pipeline_stage ** stages)38 void _tnl_install_pipeline( struct gl_context *ctx,
39 const struct tnl_pipeline_stage **stages )
40 {
41 TNLcontext *tnl = TNL_CONTEXT(ctx);
42 GLuint i;
43
44 tnl->pipeline.new_state = ~0;
45
46 /* Create a writeable copy of each stage.
47 */
48 for (i = 0 ; i < MAX_PIPELINE_STAGES && stages[i] ; i++) {
49 struct tnl_pipeline_stage *s = &tnl->pipeline.stages[i];
50 memcpy(s, stages[i], sizeof(*s));
51 if (s->create)
52 s->create(ctx, s);
53 }
54
55 tnl->pipeline.nr_stages = i;
56 }
57
_tnl_destroy_pipeline(struct gl_context * ctx)58 void _tnl_destroy_pipeline( struct gl_context *ctx )
59 {
60 TNLcontext *tnl = TNL_CONTEXT(ctx);
61 GLuint i;
62
63 for (i = 0 ; i < tnl->pipeline.nr_stages ; i++) {
64 struct tnl_pipeline_stage *s = &tnl->pipeline.stages[i];
65 if (s->destroy)
66 s->destroy(s);
67 }
68
69 tnl->pipeline.nr_stages = 0;
70 }
71
72
73
check_input_changes(struct gl_context * ctx)74 static GLuint check_input_changes( struct gl_context *ctx )
75 {
76 TNLcontext *tnl = TNL_CONTEXT(ctx);
77 GLuint i;
78
79 for (i = 0; i <= _TNL_LAST_MAT; i++) {
80 if (tnl->vb.AttribPtr[i]->size != tnl->pipeline.last_attrib_size[i] ||
81 tnl->vb.AttribPtr[i]->stride != tnl->pipeline.last_attrib_stride[i]) {
82 tnl->pipeline.last_attrib_size[i] = tnl->vb.AttribPtr[i]->size;
83 tnl->pipeline.last_attrib_stride[i] = tnl->vb.AttribPtr[i]->stride;
84 tnl->pipeline.input_changes |= 1<<i;
85 }
86 }
87
88 return tnl->pipeline.input_changes;
89 }
90
91
check_output_changes(struct gl_context * ctx)92 static GLuint check_output_changes( struct gl_context *ctx )
93 {
94 #if 0
95 TNLcontext *tnl = TNL_CONTEXT(ctx);
96
97 for (i = 0; i < VARYING_SLOT_MAX; i++) {
98 if (tnl->vb.ResultPtr[i]->size != tnl->last_result_size[i] ||
99 tnl->vb.ResultPtr[i]->stride != tnl->last_result_stride[i]) {
100 tnl->last_result_size[i] = tnl->vb.ResultPtr[i]->size;
101 tnl->last_result_stride[i] = tnl->vb.ResultPtr[i]->stride;
102 tnl->pipeline.output_changes |= 1<<i;
103 }
104 }
105
106 if (tnl->pipeline.output_changes)
107 tnl->Driver.NotifyOutputChanges( ctx, tnl->pipeline.output_changes );
108
109 return tnl->pipeline.output_changes;
110 #else
111 return ~0;
112 #endif
113 }
114
115 /**
116 * START/END_FAST_MATH macros:
117 *
118 * START_FAST_MATH: Set x86 FPU to faster, 32-bit precision mode (and save
119 * original mode to a temporary).
120 * END_FAST_MATH: Restore x86 FPU to original mode.
121 */
122 #if defined(__GNUC__) && defined(__i386__)
123 /*
124 * Set the x86 FPU control word to guarentee only 32 bits of precision
125 * are stored in registers. Allowing the FPU to store more introduces
126 * differences between situations where numbers are pulled out of memory
127 * vs. situations where the compiler is able to optimize register usage.
128 *
129 * In the worst case, we force the compiler to use a memory access to
130 * truncate the float, by specifying the 'volatile' keyword.
131 */
132 /* Hardware default: All exceptions masked, extended double precision,
133 * round to nearest (IEEE compliant):
134 */
135 #define DEFAULT_X86_FPU 0x037f
136 /* All exceptions masked, single precision, round to nearest:
137 */
138 #define FAST_X86_FPU 0x003f
139 /* The fldcw instruction will cause any pending FP exceptions to be
140 * raised prior to entering the block, and we clear any pending
141 * exceptions before exiting the block. Hence, asm code has free
142 * reign over the FPU while in the fast math block.
143 */
144 #if defined(NO_FAST_MATH)
145 #define START_FAST_MATH(x) \
146 do { \
147 static GLuint mask = DEFAULT_X86_FPU; \
148 __asm__ ( "fnstcw %0" : "=m" (*&(x)) ); \
149 __asm__ ( "fldcw %0" : : "m" (mask) ); \
150 } while (0)
151 #else
152 #define START_FAST_MATH(x) \
153 do { \
154 static GLuint mask = FAST_X86_FPU; \
155 __asm__ ( "fnstcw %0" : "=m" (*&(x)) ); \
156 __asm__ ( "fldcw %0" : : "m" (mask) ); \
157 } while (0)
158 #endif
159 /* Restore original FPU mode, and clear any exceptions that may have
160 * occurred in the FAST_MATH block.
161 */
162 #define END_FAST_MATH(x) \
163 do { \
164 __asm__ ( "fnclex ; fldcw %0" : : "m" (*&(x)) ); \
165 } while (0)
166
167 #elif defined(_MSC_VER) && defined(_M_IX86)
168 #define DEFAULT_X86_FPU 0x037f /* See GCC comments above */
169 #define FAST_X86_FPU 0x003f /* See GCC comments above */
170 #if defined(NO_FAST_MATH)
171 #define START_FAST_MATH(x) do {\
172 static GLuint mask = DEFAULT_X86_FPU;\
173 __asm fnstcw word ptr [x]\
174 __asm fldcw word ptr [mask]\
175 } while(0)
176 #else
177 #define START_FAST_MATH(x) do {\
178 static GLuint mask = FAST_X86_FPU;\
179 __asm fnstcw word ptr [x]\
180 __asm fldcw word ptr [mask]\
181 } while(0)
182 #endif
183 #define END_FAST_MATH(x) do {\
184 __asm fnclex\
185 __asm fldcw word ptr [x]\
186 } while(0)
187
188 #else
189 #define START_FAST_MATH(x) x = 0
190 #define END_FAST_MATH(x) (void)(x)
191 #endif
192
193
_tnl_run_pipeline(struct gl_context * ctx)194 void _tnl_run_pipeline( struct gl_context *ctx )
195 {
196 TNLcontext *tnl = TNL_CONTEXT(ctx);
197 unsigned short __tmp;
198 GLuint i;
199
200 if (!tnl->vb.Count)
201 return;
202
203 /* Check for changed input sizes or change in stride to/from zero
204 * (ie const or non-const).
205 */
206 if (check_input_changes( ctx ) || tnl->pipeline.new_state) {
207 if (ctx->VertexProgram._MaintainTnlProgram)
208 _tnl_UpdateFixedFunctionProgram( ctx );
209
210 for (i = 0; i < tnl->pipeline.nr_stages ; i++) {
211 struct tnl_pipeline_stage *s = &tnl->pipeline.stages[i];
212 if (s->validate)
213 s->validate( ctx, s );
214 }
215
216 tnl->pipeline.new_state = 0;
217 tnl->pipeline.input_changes = 0;
218
219 /* Pipeline can only change its output in response to either a
220 * statechange or an input size/stride change. No other changes
221 * are allowed.
222 */
223 if (check_output_changes( ctx ))
224 _tnl_notify_pipeline_output_change( ctx );
225 }
226
227 #ifndef _OPENMP
228 /* Don't adjust FPU precision mode in case multiple threads are to be used.
229 * This would require that the additional threads also changed the FPU mode
230 * which is quite a mess as this had to be done in all parallelized sections;
231 * otherwise the master thread and all other threads are running in different
232 * modes, producing inconsistent results.
233 * Note that all x64 implementations don't define/use START_FAST_MATH, so
234 * this is "hack" is only used in i386 mode
235 */
236 START_FAST_MATH(__tmp);
237 #endif
238
239 for (i = 0; i < tnl->pipeline.nr_stages ; i++) {
240 struct tnl_pipeline_stage *s = &tnl->pipeline.stages[i];
241 if (!s->run( ctx, s ))
242 break;
243 }
244
245 #ifndef _OPENMP
246 END_FAST_MATH(__tmp);
247 #endif
248 }
249
250
251
252 /* The default pipeline. This is useful for software rasterizers, and
253 * simple hardware rasterizers. For customization, I don't recommend
254 * tampering with the internals of these stages in the way that
255 * drivers did in Mesa 3.4. These stages are basically black boxes,
256 * and should be left intact.
257 *
258 * To customize the pipeline, consider:
259 *
260 * - removing redundant stages (making sure that the software rasterizer
261 * can cope with this on fallback paths). An example is fog
262 * coordinate generation, which is not required in the FX driver.
263 *
264 * - replacing general-purpose machine-independent stages with
265 * general-purpose machine-specific stages. There is no example of
266 * this to date, though it must be borne in mind that all subsequent
267 * stages that reference the output of the new stage must cope with
268 * any machine-specific data introduced. This may not be easy
269 * unless there are no such stages (ie the new stage is the last in
270 * the pipe).
271 *
272 * - inserting optimized (but specialized) stages ahead of the
273 * general-purpose fallback implementation. For example, the old
274 * fastpath mechanism, which only works when the VB->Elts input is
275 * available, can be duplicated by placing the fastpath stage at the
276 * head of this pipeline. Such specialized stages are currently
277 * constrained to have no outputs (ie. they must either finish the *
278 * pipeline by returning GL_FALSE from run(), or do nothing).
279 *
280 * Some work can be done to lift some of the restrictions in the final
281 * case, if it becomes necessary to do so.
282 */
283 const struct tnl_pipeline_stage *_tnl_default_pipeline[] = {
284 &_tnl_vertex_transform_stage,
285 &_tnl_normal_transform_stage,
286 &_tnl_lighting_stage,
287 &_tnl_texgen_stage,
288 &_tnl_texture_transform_stage,
289 &_tnl_point_attenuation_stage,
290 &_tnl_vertex_program_stage,
291 &_tnl_fog_coordinate_stage,
292 &_tnl_render_stage,
293 NULL
294 };
295
296 const struct tnl_pipeline_stage *_tnl_vp_pipeline[] = {
297 &_tnl_vertex_program_stage,
298 &_tnl_render_stage,
299 NULL
300 };
301