brw_clip.c revision dbae576f7f25fef72ca0b9f6f4822e0fddf7d607 
1/*
2 Copyright (C) Intel Corp.  2006.  All Rights Reserved.
3 Intel funded Tungsten Graphics to
4 develop this 3D driver.
5
6 Permission is hereby granted, free of charge, to any person obtaining
7 a 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, sublicense, 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
16 portions of the Software.
17
18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
21 IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
22 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
23 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
24 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25
26 **********************************************************************/
27 /*
28  * Authors:
29  *   Keith Whitwell <keithw@vmware.com>
30  */
31
32#include "main/glheader.h"
33#include "main/macros.h"
34#include "main/enums.h"
35
36#include "intel_batchbuffer.h"
37
38#include "brw_defines.h"
39#include "brw_context.h"
40#include "brw_eu.h"
41#include "brw_util.h"
42#include "brw_state.h"
43#include "brw_clip.h"
44
45#include "util/ralloc.h"
46
47#define FRONT_UNFILLED_BIT  0x1
48#define BACK_UNFILLED_BIT   0x2
49
50
51static void compile_clip_prog( struct brw_context *brw,
52			     struct brw_clip_prog_key *key )
53{
54   struct brw_clip_compile c;
55   const GLuint *program;
56   void *mem_ctx;
57   GLuint program_size;
58
59   memset(&c, 0, sizeof(c));
60
61   mem_ctx = ralloc_context(NULL);
62
63   /* Begin the compilation:
64    */
65   brw_init_codegen(brw->intelScreen->devinfo, &c.func, mem_ctx);
66
67   c.func.single_program_flow = 1;
68
69   c.key = *key;
70   c.vue_map = brw->vue_map_geom_out;
71
72   c.has_flat_shading =
73      brw_any_flat_varyings(&key->interpolation_mode);
74   c.has_noperspective_shading =
75      brw_any_noperspective_varyings(&key->interpolation_mode);
76
77   /* nr_regs is the number of registers filled by reading data from the VUE.
78    * This program accesses the entire VUE, so nr_regs needs to be the size of
79    * the VUE (measured in pairs, since two slots are stored in each
80    * register).
81    */
82   c.nr_regs = (c.vue_map.num_slots + 1)/2;
83
84   c.prog_data.clip_mode = c.key.clip_mode; /* XXX */
85
86   /* For some reason the thread is spawned with only 4 channels
87    * unmasked.
88    */
89   brw_set_default_mask_control(&c.func, BRW_MASK_DISABLE);
90
91
92   /* Would ideally have the option of producing a program which could
93    * do all three:
94    */
95   switch (key->primitive) {
96   case GL_TRIANGLES:
97      if (key->do_unfilled)
98	 brw_emit_unfilled_clip( &c );
99      else
100	 brw_emit_tri_clip( &c );
101      break;
102   case GL_LINES:
103      brw_emit_line_clip( &c );
104      break;
105   case GL_POINTS:
106      brw_emit_point_clip( &c );
107      break;
108   default:
109      unreachable("not reached");
110   }
111
112   brw_compact_instructions(&c.func, 0, 0, NULL);
113
114   /* get the program
115    */
116   program = brw_get_program(&c.func, &program_size);
117
118   if (unlikely(INTEL_DEBUG & DEBUG_CLIP)) {
119      fprintf(stderr, "clip:\n");
120      brw_disassemble(brw->intelScreen->devinfo, c.func.store,
121                      0, program_size, stderr);
122      fprintf(stderr, "\n");
123   }
124
125   brw_upload_cache(&brw->cache,
126		    BRW_CACHE_CLIP_PROG,
127		    &c.key, sizeof(c.key),
128		    program, program_size,
129		    &c.prog_data, sizeof(c.prog_data),
130		    &brw->clip.prog_offset, &brw->clip.prog_data);
131   ralloc_free(mem_ctx);
132}
133
134/* Calculate interpolants for triangle and line rasterization.
135 */
136static void
137brw_upload_clip_prog(struct brw_context *brw)
138{
139   struct gl_context *ctx = &brw->ctx;
140   struct brw_clip_prog_key key;
141
142   memset(&key, 0, sizeof(key));
143
144   /* Populate the key:
145    */
146
147   /* BRW_NEW_INTERPOLATION_MAP */
148   key.interpolation_mode = brw->interpolation_mode;
149
150   /* BRW_NEW_REDUCED_PRIMITIVE */
151   key.primitive = brw->reduced_primitive;
152   /* BRW_NEW_VUE_MAP_GEOM_OUT */
153   key.attrs = brw->vue_map_geom_out.slots_valid;
154
155   /* _NEW_LIGHT */
156   key.pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
157   /* _NEW_TRANSFORM (also part of VUE map)*/
158   if (ctx->Transform.ClipPlanesEnabled)
159      key.nr_userclip = _mesa_logbase2(ctx->Transform.ClipPlanesEnabled) + 1;
160
161   if (brw->gen == 5)
162       key.clip_mode = BRW_CLIPMODE_KERNEL_CLIP;
163   else
164       key.clip_mode = BRW_CLIPMODE_NORMAL;
165
166   /* _NEW_POLYGON */
167   if (key.primitive == GL_TRIANGLES) {
168      if (ctx->Polygon.CullFlag &&
169	  ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
170	 key.clip_mode = BRW_CLIPMODE_REJECT_ALL;
171      else {
172	 GLuint fill_front = CLIP_CULL;
173	 GLuint fill_back = CLIP_CULL;
174	 GLuint offset_front = 0;
175	 GLuint offset_back = 0;
176
177	 if (!ctx->Polygon.CullFlag ||
178	     ctx->Polygon.CullFaceMode != GL_FRONT) {
179	    switch (ctx->Polygon.FrontMode) {
180	    case GL_FILL:
181	       fill_front = CLIP_FILL;
182	       offset_front = 0;
183	       break;
184	    case GL_LINE:
185	       fill_front = CLIP_LINE;
186	       offset_front = ctx->Polygon.OffsetLine;
187	       break;
188	    case GL_POINT:
189	       fill_front = CLIP_POINT;
190	       offset_front = ctx->Polygon.OffsetPoint;
191	       break;
192	    }
193	 }
194
195	 if (!ctx->Polygon.CullFlag ||
196	     ctx->Polygon.CullFaceMode != GL_BACK) {
197	    switch (ctx->Polygon.BackMode) {
198	    case GL_FILL:
199	       fill_back = CLIP_FILL;
200	       offset_back = 0;
201	       break;
202	    case GL_LINE:
203	       fill_back = CLIP_LINE;
204	       offset_back = ctx->Polygon.OffsetLine;
205	       break;
206	    case GL_POINT:
207	       fill_back = CLIP_POINT;
208	       offset_back = ctx->Polygon.OffsetPoint;
209	       break;
210	    }
211	 }
212
213	 if (ctx->Polygon.BackMode != GL_FILL ||
214	     ctx->Polygon.FrontMode != GL_FILL) {
215	    key.do_unfilled = 1;
216
217	    /* Most cases the fixed function units will handle.  Cases where
218	     * one or more polygon faces are unfilled will require help:
219	     */
220	    key.clip_mode = BRW_CLIPMODE_CLIP_NON_REJECTED;
221
222	    if (offset_back || offset_front) {
223	       /* _NEW_POLYGON, _NEW_BUFFERS */
224	       key.offset_units = ctx->Polygon.OffsetUnits * ctx->DrawBuffer->_MRD * 2;
225	       key.offset_factor = ctx->Polygon.OffsetFactor * ctx->DrawBuffer->_MRD;
226	       key.offset_clamp = ctx->Polygon.OffsetClamp * ctx->DrawBuffer->_MRD;
227	    }
228
229	    if (!ctx->Polygon._FrontBit) {
230	       key.fill_ccw = fill_front;
231	       key.fill_cw = fill_back;
232	       key.offset_ccw = offset_front;
233	       key.offset_cw = offset_back;
234	       if (ctx->Light.Model.TwoSide &&
235		   key.fill_cw != CLIP_CULL)
236		  key.copy_bfc_cw = 1;
237	    } else {
238	       key.fill_cw = fill_front;
239	       key.fill_ccw = fill_back;
240	       key.offset_cw = offset_front;
241	       key.offset_ccw = offset_back;
242	       if (ctx->Light.Model.TwoSide &&
243		   key.fill_ccw != CLIP_CULL)
244		  key.copy_bfc_ccw = 1;
245	    }
246	 }
247      }
248   }
249
250   if (!brw_search_cache(&brw->cache, BRW_CACHE_CLIP_PROG,
251			 &key, sizeof(key),
252			 &brw->clip.prog_offset, &brw->clip.prog_data)) {
253      compile_clip_prog( brw, &key );
254   }
255}
256
257
258const struct brw_tracked_state brw_clip_prog = {
259   .dirty = {
260      .mesa  = _NEW_BUFFERS |
261               _NEW_LIGHT |
262               _NEW_POLYGON |
263               _NEW_TRANSFORM,
264      .brw   = BRW_NEW_INTERPOLATION_MAP |
265               BRW_NEW_REDUCED_PRIMITIVE |
266               BRW_NEW_VUE_MAP_GEOM_OUT,
267   },
268   .emit = brw_upload_clip_prog
269};
270